Standard of Ministry of Electrical Power P.R. China

The Specification of Erection and Acceptance for Power Plant Construction

Welding Section

Issue by Ministry of Electrical Power P.R. China

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CONTENTS

Chapter 1 General

Chapter 2 Welding personnel

Chapter 3 Base metal & welding materials

Chapter 4 Preparation before welding

Chapter 5 Welding technology

Chapter 6 Post-weld heat treatment

Chapter 7 Quality inspection

Chapter 8 Quality criterion

Chapter 9 Technical documentation

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Chapter 1 General

1.0.1 This specification is applicable to the welding work of boiler, pressure piping, vessels and

steel structures in the design , fabrication, erection and maintenance of thermal power generating plant (with unit capacity ≤ 600MW) of electrical power industry .

1.0.2 This specification is applicable to the welding technologies of manual arc welding, tungsten

argon arc welding, flame gas welding and automatic submerged arc welding on carbon steel (with carbon content≤ 0.35%), common low-alloy steel and heat resisting steel. For

other materials and welding technologies, technical requirements shall be drawn up

according to this specification and relevant technical standards.

1.0.3 The erection & acceptance of foreign electrical power units shall be carried out according to

this specification except that be specified in the construction contract.

1.0.4 Quality inspection of welding seam shall be carried out separately based on the working

condition and quality requirements of components.

1.0.5 For inspection upon materials and welding joints of equipment , ball test, welding

technology test , welding seam quality inspection and technical examination of welding

operators shall be carried out according to corresponding regulations.

1.0.6 In carrying out welding work , relevant safety, fire prevention , environment protection and

other regulations shall be strictly observed.

Chapter 2 Welding Personnel

2.0.1 Welding personnel include welding technicians, welding quality supervisors , welding

inspectors, welding operators and heat- treatment workers.

2.0.2 Any enterprise should appoint the chief of welding speciality and the full-time welding

quality inspectors.

2.0.2.1 The chief of welding speciality shall have a great deal of welding knowledge and

experience , take the charge of all welding technology and quality management and the

qualification examination of welding personnel.

2.0.2.2 The enterprise and its chief section should organize the technical training to all welding

personnel to raise their technical , theoretical and management level.

2.0.3 Basic requirements upon welding personnel and their work content

2.0.3.1 Welding technicians

(1) The technicians, who takes the technical management of welding work for the first

time , shall have been trained in a systematically way and have gained , at least ,

one-year vocational experience, and shall passed examination and obtained the

qualification certificate.

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(2) Keeping informed on general status of project; observing this specification strictly;

working out organization design of welding construction and drawing up technical

measures with reality conditions and training program for welding operators, and

participating the work of examination committee of welding operators;

(3) Based upon technical measures, explaining technical intention to relevant personnel

and guiding technique and supervising ;

(4) Organizing the assessment of welding technology and preparing operational guideline

for welding work;

(5) Participating the quality acceptance of important pipes and parts;

(6) Recording, checking and sorting out welding technical data and participating the

preparation of technical summary and handing over technical documents on

completion.

2.0.3.2 Supervisors of welding quality

(1) Supervisors of welding quality shall have gained the educational background of

middle school or higher and required skills and experience, moreover, they shall pass

the special examination and obtain the qualification certificate ;

(2) Be in charge of determining the items to be check , signing and issuing inspection

files, supervision of welding quality , accepting and assessing welding projects;

(3) Participating the audit of technical measures , supervising the implementation of

technical measures at the work site , stopping any violation of regulations in welding

operation in time and reporting to relevant department;

(4) Accumulating and summarizing of quality controlment data & documents , cooperating

with relevant personnel in handing over the data & documents on completion;

(5) Determining the welding seams to be examined, recording the results strictly and

urging relevant department to do the work of quality inspection better;

(6) Checking the qualification certificates of welding operators , overseeing their skill

status. For those whose welding results frequently fail to meet the requirements,

supervisors have the authority to cease their welding work and suggest the welder

examination committee to suspend their qualification certificates.

2.0.3.3 Welding inspectors

(1) The welding inspectors shall have undergone specialized technical training and

succeeded in passing the examination and obtaining qualification certificates before

being assigned for corresponding welding inspection work.

(2) Welding inspectors shall perform inspecting , checking and assessing the quality of

welding seams in conformity with this specification and relevant standards;

(3) Welding inspectors shall inspect timely upon the localities determined by the welding

quality supervisor and raise up accurate and correct conclusion;

(4) Welding inspectors shall fill , marshal and reserve all the data and documents of

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inspection.

(5) Welding inspectors shall refuse doing the NDT if the joint visual examination is not

passed.

2.0.3.4 Welding operators

(1) Welding operators shall have been trained with welding knowledge and practical

operating vocational skills and have been examined ;

(2) Those welding operators, who are assigned to carry out welding work of the following

component, shall be qualified in passing the relevant technical examination;

a. Bearing steel structures: boiler steel framework (main columns and main beams),

hoisting equipment structures, and rooftrees of main machine hall;

b. Boiler heating surface tubes ;

c. Pipes and vessels with working pressure above 0.1Mpa ;

d. Vessels for storing flammable and explosive medium (fluid or gas) and their

transporting pipes;

e. Welding up non-bearing components on bearing structure under supervision.

f. Welding up the parts which will rotate at high speed

(3) Welders shall observe the professional ethics , carrying out welding operation strictly

according to the given technology and measures, observing welding operational

guidance given in this specification or by his/her employer.

(4) Welders shall carefully read the operational guidance before starting welding , and

shall refuse any welding operation inconsistent with the guidance . Any major quality

problem shall be reported timely to the relevant personnel, on occurring , and shall not

be treated without authorization.

(5) The examination shall be taken again for the qualified welder having been interrupted

welding operation of supervised parts for more than six months.

(6) The qualified welder shall not allowed to do the welding works exceed the extent of

his qualified items.

2.0.3.5 Heat treatment worker

(1) Heat treatment workers shall have undergone specialized technical training and

succeeded in passing the qualification examination;

(2) Heat treatment worker shall observe the relevant stipulations in this specification and

welding technical measures regarding to heat treatment , execute the operations

without mistake and make the data record accurately;

(3) On the completion of heat treatment, the worker shall proceed to self-inspection and

have the heat treatment data and documents sorted well for accumulation.

Chapter 3 Base Metal & Welding Materials

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3.0.1 Prior to welding , the grade of the materials to be welded shall be found out in order to

select the relevant weld materials and to ascertain the appropriate processes of welding

and heat treatment.

3.0.2 The steels to be welded shall conform with the national standards (or ministerial

standards , technical standards ) . Imported steels shall correspond to the contract

requirements or the standards of the country.

3.0.3 The quality of welding materials such as welding electrodes, welding wires, tungsten rods,

argon gas, oxygen, acetylene and flux shall conform with national standards (or relevant

standards)

3.0.4 There shall be qualification certificates for steels , welding electrodes and wires from the

manufacturers . In case these are lacking or there is any doubt raised upon their quality,

tests on random sampling from each batch shall be carried out and only those being

tested to be qualified, can be put in use.

3.0.5 The selection of welding electrodes and wires shall be based upon comprehensive

considerations for chemical composition, mechanical and anti-cracking properties,

carbon-diffusion, preheating, post-weld heat treatment of weld-butting as well as usage

condition , etc. .

3.0.5.1 In welding of same type steel, the selection of welding electrodes (wires) shall in general

conform with the following requirements:

(1) The chemical composition and mechanical properties of welding seam metal shall

correspond with those of parent metal;

(2) Possessing superior technological properties.

3.0.5.2 In welding of different type steels, the selection of welding electrodes (wires) shall in

general conform with the following requirements:

(1) For steel , which both sides not austenic stainless steel , welding electrodes (wires)

whose composition matches with that of the side containing less alloy , or lies in

between the content of both sides , can be employed;

(2) For one side being austenic stainless steel , welding electrodes (wires) of stainless

steel with higher nickel content can be employed;

3.0.6 Thorium-tungsten rods shall be used for tungsten argon arc welding , and the purity of

argon gas shall not be lower than 99.95%.

3.0.7 The purity of oxygen used for oxygen-acetylene welding shall be above 98.5%. The purity of acetylene shall be conform with the requirements of GB6819-86 《Solution of Calcium

Carbide》. The calcium carbide used for producing acetylene shall be provided with

shipping certificate , the quality of calcium carbide for flame welding can be determined by

the way of testing sulphur and phosphorus contents contained in the welding seam

(according to the standards for welded metal); The gas employed in butt welding shall

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have been in general filtered. The calcium carbide , which has not been checked or

whose impurity exceeds standard value , shall not be used for welding.

Chapter 4 Preparations before Welding

4.0.1 The location of welding seams shall be away from the areas of stress concentration and

shall be easy for welding operating and heat treatment . In general , it shall conform with

the following requirements:

4.0.1.1 For butt welding of boiler heating surface tubes, the center line of the welding seam shall

be spaced from the starting point of tube bend or from external wall of drum or header as

well as from the sides of suspension or hanger bracket for at least 70mm ; the space

between two butt welds shall not be less than 150mm ;

4.0.1.2 For butt welding of pipes, the space between center line of the welding seam and the

starting point of pipe bending shall be not less than the external diameter of pipe, and not

less than 100mm (except welded , forged or cast pipe piece) and the space to the side of

suspension or hanger bracket shall be at least 50mm . In addition , space between butt

welding seams shall not be less than both the pipe diameter and 150mm .

4.0.1.3 The tube/pipe joints and receptacles of instrumentation , in general , shall not be placed at

/welding seam or in heat-affected-zone.

4.0.1.4 For butt welding of cylindrical shell , the center line of the welding seam shall be spaced

from the starting point of bending of sealing head for not less than the sum of wall

thickness plus 15mm , and , in addition , shall be not less than 25mm , but not more than

50mm .

4.0.1.5 For cylindrical shells and sealing heads with longitudinal welding seams ,the two adjacent

longitudinal seams shall be spaced more than 3 times of wall thickness and not less than

100mm.

4.0.1.6 The holes of welded-on tubes/pipes shall be opened away from the welding seams as

much as possible . The welding seams of tubes/pipes holes shall be kept not to coincide

heat-affected-zone of the adjacent weld seam . In case this is unavoidable , holes can be

opened on the welding seams or at its vicinity only after the following requirements have

been met:

(1) On both side of the pipe hole, the welding seam within 60mm away from the edge of

hole , shall base on the requirement of Table 8.0.3 , be non-destructively tested and

proven to be qualified;

(2) The edge of the hole shall not be on the defects of welding seams;

(3) The pipe joints shall have the stress relieved by post welding heat-treatment.

4.0.1.7 For lap welded joints, the dimension of lapping shall be not less than 5 times of the parent

metal thickness , and in any case , not less than 30mm.

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4.0.2 The grooves of tubes/pipes, pressure vessels and steel structures shall be made

according to the stipulation of design drawings . In case there is no such stipulation , the

shape and dimension of grooves shall be selected with respect to the principle that it can

assure the welding quality with fewer quantity of filler metal ,ease of operating, improving

working condition , reducing welding stress and deformation , adapting to the requirement

of non-destructive testing , etc.

Shapes and dimensions of welding joints generally used are shown in Table 4.0.2.

Table 4.0.2 Basic patterns and sizes of weld joints

Structure size of joints Serial number

Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thicknessδ

(mm) α β b (mm)

P (mm)

R (mm)

Scope

1 Ⅰ

Gas welding Electric welding

Buried arc welding

<3 ≤ 3

8~16 — —

1~2 1~2 0~1

— — Vessels and common steel structure

2 Ⅴ

Gas welding Electric

arc welding

Buried arc welding

≤ 6

≤ 16 >16~20

30º~35º — 1~3 1~3 0~1

0.5~2 1~2

7 —

All types of pressure pipes, pressure vessels and medium and thin pressure structure

3

Butt joint

U

Electric arc

welding ≤ 60 10º~15º — 2~3 2 5

Steam water tubing with medium and thick walls

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To be continued

Structure size of joints Serial

number Patterns of joints Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

4 Double V

Horizontal pipe

Electric arc

welding >16~60

30º~40º

8º~12º 2~5 1~2 5

Steam water tubing with medium and thick walls

5

Butt joint

Double V

Vertical pipe

Electric arc

welding >16~60

α 1=

35º~40º α 2=

20º~25º

β 1=

15º~20º β 2=

5º~10º

1~4 1~2 5

Steam water tubing with medium and thick walls

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To be continued

Structure size of joints Serial

number Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

6 Comprehensive shape

Electric arc

welding >60

20º~25º

5º 2~3 2 5

Steam water tubing with thick walls

7

Butt joint

Xshape

Electric arc

welding Buried

arc welding

>16 >20

30º~35º

— 2~3 0~1

2~4 7 —

Both sides welding large vessels and structure

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To be continued

Structure size of joints Serial

number Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

8 Closure head

Electric arc

welding

Pipe diameter

not limited

Process requirements of bevel of wall pipe of same thickness

Steam water tubing and collecting

box closure head

9

Butt joint

Casing cap

Electric arc

welding Diameter Process requirements of bevel of

wall pipe of same thickness

Steam water tubing and collecting

box casing cap

12

To be continued

Structure size of joints Serial

number Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

10

Electric arc

welding

Diameter of pipe

Φ ≤ 76

50º~6030º~35

º 2~3 1~2

According to

difference of wall

thickness

Connection pipe socket of Steam water, meter and samples, etc

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T Pipe socket

Electric arc

welding

Diameter of pipe

Φ 76~ 133

50º~6030º~35

º 2~3 1~2 —

Connection pipe socket or joint of common steam water pipe and vessels

13

To be continued

Structure size of joints Serial

number Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

12 No bevel

Electric arc

welding Buried

arc welding

≤ 20 >8

— — 0~2 — —

Complete fusion structure is not required

Electric arc

welding Buried

arc welding

>20 50º

~60º — 0~2

≤ 2

δ 3

—

Complete fusion structure is not required

13

T shape

Single V pattern

Electric arc

welding Buried

arc welding

≤ 20 50º

~60º — 1~2 1~2 —

Complete fusion structure is required

To be continued

14

Structure size of joints Serial

number Patterns of joints

Patterns of bevel Diagram Welding

methods

Weldment thickness

δ (mm)

α β b (mm)

P (mm)

R (mm)

Scope

14 T shape K pattern

Electric arc

welding Buried

arc welding

>20 50º

~60º — 1~2 1~2 —

Complete fusion large structure is required

15 Butt joint

Gas arc welding Electric

arc welding Buried

arc welding

≤ 4

≥ 4

>8

— — 0~1 — — Vessels and structure

2) Pipes with wall thickness less than or equal to 6mm of heated surface can also be rendered and finished by argon-arc welding.

4) δ 1 value of closure head should accord with design; f value should accord with design and should not be less than 20mm. 3) Pipes with wall thickness larger than 6mm can be rendered by argon-arc welding and finished by electric arc welding.

1) Tungsten electrode argon-arc welding is same with electric arc welding in structure and size of weld junction .

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5) The lapping size L equals to 5δ , and is not less than 30mm.

Notes :

4.0.3 In cutting off parent material and grooving ,the following requirements shall in general be

complied with:

4.0.3.1 It is preferable that the cutting off the pieces to be welded is done by machining,

especially for the kind of alloy steel which tends to become more or less hardened in

quenching , and for the pipes/tubes of steam/water with nominal diameter<100mm and

those with nominal diameter>100mm at working pressure above 3.9MPa .

4.0.3.2 If cutting pieces through the heat-method , e.g. flame cutting , the part of cutting edge

shall be long enough in order to remove the quench hardened and over-heated metal .

4.0.3.3 It is preferable that the grooving be done by machining . If groove cut by flame , the oxide

matter slag splashing and other debris thereon shall be thoroughly chiseled off and the

unsmoothness be trimmed;

4.0.4 In cutting off workpiece and grooves, the following requirements shall in general be

complied with:

(1) For alloy steel which tends to become more hardened in quenching ,the part of cutting

edge shall undergo surface flaw detection test after flame cutting;

(2) On the edge of groove which is cut through shears , there shall be no defects such as

cracks , rags , cut away edges , etc. on base metal.

(3) The size of the groove conform with the requirements in the drawing samples.

(4) There shall be no defects such as cracks in the scope of being cleaned specified in

4.0.5.

4.0.5 Before the piece to be welded being assembled , the surface of weld junction and oil

stain , paint , dirt and rust on the internal and external wall shall be thoroughly cleaned to

the metallic luster . At the same time , inspection shall be made to ascertain there are no

defects as cracks, entrapped layer , etc. . The scope of cleaning is stipulated as follows:

(1) For weld junction of manual welding , cleaning to be extended to over 10mm on both

sides;

(2) For weld junction by automatic submerged arc welding , cleaning to be extend to over

20mm on both sides;

(3) For weld junction of fillet welding, cleaning to be extend 10mm beyond the fillet weld

size.

4.0.6 The end surface of butting tube/pipe shall be perpendicular to the center line with a deviation allowance (△ f ) specified in Table 4.0.6.

Table 4.0.6 Deviation requirements of end surface to center line of tube/pipe

Illustration External diameter of pipe

(mm)

△ f

(mm)

≤ 60

>60～159

>159～219

0.5

1

1.5

16

>219 2

4.0.7 While the piece to be welded being butted , the inner walls shall be , in general , kept flat .

In case there is slight offset , its magnitude shall conform with the following requirements:

1) The part offset for single-sided butt welding shall be not more than 10% of the wall

thickness , and not more than 1mm;

2) The part offset for double-sided butt welding shall be not more than 10% of the

thickness of the piece to be welded , and not more than 3mm.

4.0.8 In butting pieces to be welded of different thickness , the following ways to solve the

deviation of thickness can be resorted:

1) Inside wall dimension unequal and external wall suited flat , the groove can be shaped

as shown in Fig. 4.0.8(a);

2) External wall dimension unequal and inside wall suited flat , the groove can be shaped

as shown in Fig. 4.0.8(b);

3) Both the inside and external wall dimensions unequal , the groove can be shaped as

shown in Fig. 4.0.8(c); 4) Inside wall dimensions unequal and difference of thickness≤ 5mm , the groove can be

shaped as shown in Fig. 4.0.8(d) , as long as the strength of piece to be welded is not

impaired.

Fig. 4.0.8 the solution on butt welding of pipe with different wall thickness （a）Inside wall dimension unequal （b）External wall dimension unequal

（c）Both the inside and external wall dimensions unequal （d）δ2-δ1 ≤ 5mm

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4.0.9 In case the partial gap of weld junction is too large , it shall be imperative to mend it to

stipulated size strively. It is strictly forbidden to fill in foreign materials.

4.0.10 Welding electrodes and flux shall be kept in dry , ventilated house and the temperature shall be above 5℃ & the humidity of air less than 60% .

Welding electrodes and flux shall be baked according to the requirements of specification before being used ，but the times of baking shall not more than twice. Before being use , the welding

wires shall be cleaned to such degree removing any rust and oil stain up to metallic luster

appears.

Those electrodes to be used for important parts shall be kept in special dry box and the temperature at the range of 100~150℃.

Those electrodes kept above one year and to be used for important part ,shall undergo the exam

if any doubt ,it shall be used only when the results of exam conform with the requirements.

4.0.11 On assembling the pieces to be welded , care shall be taken to have them leveled up firmly in

order to avoid them getting deformed in the course of welding and heat treatment.

4.0.12 Except butting through cold drawing forth as stipulation in design , butting by force shall be

prohibited in order to avoid additional stress.

4.0.13 At the welding site , anti-blow , rainproof , snowproof and anti-freeze measures shall be

taken.

4.0.14 The course of welding include four stages , i.e., assembly , welding, heat-treatment , and

inspection . The course shall be continued only while the last stage conform with the

requirements.

4.0.15 Qualified welding operators shall take simulated exercises and pass the fracture surface

checking before they are assigned to welding up boiler heating surface tubes .

Chapter 5 Welding Technology 5.0.1 The allowable lowest ambient temperatures during welding are as follows: low carbon steels -10℃

low alloy steels and common low-alloy steels 0℃

medium and high alloy steels 10 ℃

5.0.2 The preheat temperature of various steel before being welded are shown in Table 5.0.2 ;

additionally the following stipulations shall be observed :

Table 5.0.2 Preheat Temperature

tube/pipe plate

Grade wall thickness

(mm)

Preheat

Temperature(°C)

thickness

(mm)

Preheat

Temperature(°C)

forge and carbon steel with c≤ 0.35% ≥ 26 100~200 ≥ 34 100~150

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C-Mn(16Mn) ≥ 15 150~200 ≥ 30 100~150

Mn-V(15MnV) ≥ 15 150~200 ≥ 28 100~150

1/2Cr-1/2Mo(12CrMo) - - ≥ 15 150~200

1Cr-1/2Mo(15CrMo,ZG20CrMo) ≥ 10 150~250 ≥ 15 150~200

1 1/2Mn-1/2Mo-V(14MnMoV,18MnMoNbg) - - ≥ 15 150~200

1Cr-1/2Mo-V(12Cr1MoV,ZG20CrMo) - 200~300 - -

1 1/2Cr-1Mo-V(15Cr1Mo1V,ZG15Cr1Mo1V) ≥ 6 250~350 - -

2Cr-1/2Mo-VW(12Cr2MoWV) ≥ 6 250~350 - -

1 3/4Cr-1/2Mo-V ≥ 6 250~350 - -

2 1/4Cr-1Mo(12Cr2Mo) ≥ 6 250~350 - -

3Cr-1Mo-VTi(12Cr2MoVSiTiB) ≥ 6 250~350 - -

9Cr-1Mo - 300~400 - -

12Cr-1Mo-V - 300~400 - -

Notes: (1) When tungsten electrode argon-arc welding is utilized for rendering, 50℃can be lowered

than the temperature of lower limit.

(2) When the external diameter of pipe is larger than 219mm or wall thickness is larger than or

equal to 20mm, pre-heating can be performed with electrical heating method.

5.0.2.1 The preheat requirements shall be raised based upon the results of welding technological

test ; 5.0.2.2 For alloy steel pipes and their ancillary components （e.g. tee-piece , bent pipe）with wall

thickness≥ 6mm to be welded under an ambient temperature below 0℃ the preheated

temperatures shall be raised up 20~50℃ above the stipulated values given in Table 5.0.2 ;

5.0.2.3 Low alloy steel pipes with wall thickness <6mm and low carbon steel pipes with wall thickness>15mm to be welded under an ambient temperature below 0℃,shall also be

appropriately preheated ;

5.0.2.4 While welding up different type steels , the preheat temperature shall be selected in

accordance with that material with poorer weld ability or higher content of alloy ;

5.0.2.5 In welding up main pipe with stub , the preheated temperature shall conform with the

stipulation for main pipe ;

5.0.2.6 In welding up unpressurized components onto the pressure vessel , the preheated

temperature shall be selected according to the pressure vessel .

5.0.3 The width of preheat band shall be measured from the center of butting extending , not less

than 3 times of weldpiece wall thickness on each side .

5.0.4 In the course of welding, the temperature of interpass shall not be lower than the lower limit of preheat temperature and not higher than 400 ℃ .

5.0.5 In order to assure the inner side of pipe cleaned and the root layer quality of seam , the

welding method shall conform with the stipulation in Table 5.0.5 for pressure piping welding .

Table 5.0.5 Welding Methods of Pressure Pipe

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Name of parts welding pass of root other pass

boiler heating surface pipe with p≥ 10MPa, δ≤ 6mm TIG TIG/SMAW

pipe/stub with p≥ 10MPa, δ>6mm TIG SMAW

pipe with p≥ 4MPa, t≥ 450°C TIG SMAW

reheated steam cool & hot pipes, bypass pipes TIG SMAW

pipes of cooling , lubricant and fuel , T/G TIG TIG/SMAW

boiler heating surface pipe with p<10MPa, δ≤ 6mm TIG TIG/SMAW

Other pipes TIG SMAW

5.0.6 For medium or high alloy steel pipes (Cr content ≥ 3％ or total alloy content >5% ) , argon or

mixed gas shall be fill in to prevent the root layer from being oxidized or overburnt .

5.0.7 It is strictly forbidden to initiate arc , test the electric current amount or weld temporary

supports on the work pieces to be welded.

5.0.8 While tube/pipe being welded , there shall not be air-flow blowing through.

5.0.9 In tack-welding at root position of butt joint , similar requirements regarding welding materials ,

technology , operator and preheated temperatures as those stipulated for normal welding shall

come into effect . In addition , the following requirements shall be met :

5.0.9.1 After tack-welding at root position of butt joint, the quality of each welding point shall be

inspected . When defects being discovered , it shall be remove at once and tack-welding shall be

done again .

5.0.9.2 Care shall be taken to prevent damaged to base metal while removing temporary tack used

for tack-welding of large wall thickness pipes . The residual weld deposit shall be removed off and

repaired .

5.0.10 While tungsten argon arc welding being employed for root layer seam , in order to avoid the

occurrence of cracks , welding of next layer seam shall be timely carried out once the previous

layer has been inspected .

In welding up multi-layer and multi-run seams , attention shall be paid to the defects occurring in

each layer , and proceeding to the next layer can be continued only after the seam quality being

ascertained qualified by operator’s own inspection.

5.0.11 The pipe of large wall thickness and diameter shall be welded with multi-layer and multi-run

welding , when the thickness of the pipe more than 35mm , the following requirement shall be

met :

5.0.11.1 The thickness of root layer welded by tungsten argon arc welding shall be not less than

3mm;

5.0.11.2 The thickness of the rest layer of other pass shall not more than the electrode diameter plus

2mm;

5.0.11.3 The oscillation width of single pass shall not more than five times of diameter . For the

arrangement of multi-run pass of large wall thickness pipe see the Fig. 5.0.11.

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Fig. 5.0.11 Pass arrangement for welding up thick-wall pipes

5.0.12 In order to minimize welding deformation and defects , it is preferable that welding by two

operators simultaneously at symmetrical positions for butt welding of pipes with diameter larger

than 194mm is to be resorted.

5.0.13 The welding of steel structure shall conform with welding procedure specifications .

5.0.14 In the course of welding , special attention shall be paid to the quality of joint and arc

extinction , the joint of multi-layer shall be stagger , while extinguishing arc , the fused bath shall

be filled up.

5.0.15 Welding shall be carried out continuously to completion except interruptions necessary for technology or inspection . In case of interruptions , measures （e.g. , post-heating , slow-cooling ,

or thermal insulation）shall be taken to prevent the occurrence of cracks . Close inspection on

whether any crack occurs shall be carried out before welding proceeding .

5.0.16 For butt welding of pipes or vessels with nominal diameter>1000mm,double-side welding at

symmetrical positions shall be employed . In order to ensure the quality of sealing end welding ,

root layer of welding seam shall be cleaned up , and the oxide shall be removed .

5.0.17 For the concealed welding seams which have to be inspected , inspection shall be done to

verify their qualification before going on the next process.

5.0.18 On the completion of welding , a clear up shall be done around the seam which is to be

inspected by the operators on their own for qualifications . The embossed stamp bearing the

operators number or designation can then be applied near the welding seam.

5.0.19 For the steel which is liable to form delayed crack , heat treatment shall be applied soon after

welding . Otherwise , post-heat-treatment shall be required with a temperature preferably to be 250-350℃,followed by a slow cooling process and thermal insulation . The scope of heating is the

same as that of heat-treatment.

5.0.20 In case of defects exceeding the allowable range , mending by cutting out and patching can

be resorted as remedial measures . However , such mending can not be applied more than three times （twice for medium and high alloy steel）at the same location , and shall be done in

accordance to the stipulations as follows :

5.0.20.1 The defects are to be removed thoroughly;

5.0.20.2 Mending weld shall be carried out according to the technological requirements , and

specified procedures of mending .

21

5.0.20.3 For welds requiring immediate heat treatment , heat treatment shall be done once again

after mending .

5.0.21 The tools used for fixing cold drawn welding gap of pipes shall be dismounted only after

completion of en bloc butt welding and heat treatment.

5.0.22 Do not allow to correct the welding joint by heating.

Chapter 6 Post Welding Heat Treatment

6.0.1 The aim of heat treatment is to reduce the stress at the welding joint and to improve the

metallic structure and property of the seam . Consequently it shall be carried out in conformity

with the heat treatment specification and relevant stipulations.

6.0.2 Heat treatment shall be carried out for the following welding joints after they being welded:

6.0.2.1 Carbon steel pipes and pipe auxiliary components with wall thickness more than 30mm;

6.0.2.2 Carbon steel vessels with wall thickness more than 32mm;

6.0.2.3 Common low alloy steel vessels with wall thickness more than 28mm; 6.0.2.4 Thermal resisting steel pipes and their auxiliary components（except those in 6.0.3）;

6.0.2.5 Weld pieces which required heat treatment as determined by welding technology test and

assessment .

6.0.3 The following parts which are welded by argon arc welding or low hydrogen electrodes and

treated by preheating and appropriately slow-cooling after welding , shall be exempted from heat

treatment . 6.0.3.1 Alloy steel pipes of 15CrMo 、12Cr2Mo with wall thickness ≤ 10mm and diameter≤ 108mm;

6.0.3.2 Pipes of 12Cr1MoV with wall thickness≤ 8mm and diameter≤ 108mm .

6.0.3.3 Pipes of 12Cr2MoWVB with wall thickness≤ 6mm and diameter≤ 63mm .

6.0.4 Post welding heat treatment generally is high temperature tempering.

The heat treatment temperatures and sustaining duration for commonly used steels are shown in

Table 6.0.4. Table 6.0.4 Post weld heat treatment temperature （°C）

temperature thickness(mm)

steel grade ≤ 12.5 >12.5~25 >25~37.5 >37.5~50 >50~75 >75~100 >100~125

(°C) sustaining duration（hour）

C≤ 0.35(20g,ZG25) , C-Mn(16Mn) 600~650 - - 1 1/2 2 2 1/4 2 1/2 2 3/4

1/2Cr-1/2Mo(12CrMo) 650~700 1/2 1 1 1/2 2 2 1/4 2 1/2 2 3/4

1Cr-1/2Mo(15CrMo,ZG20CrMo) 670~700 1/2 1 1 1/2 2 2 1/4 2 1/2 2 3/4

1Cr-1/2Mo-V(12Cr1MoV,ZG20CrMo) 720~750 1/2 1 1 1/2 2 3 4 5

1 1/2Cr-1Mo-V(ZG15Cr1Mo1V) 720~750 1/2 1 1 1/2 2 3 4 5

1 3/4Cr-1/2Mo-V 720~750 1/2 1 1 1/2 2 3 4 5

22

2 1/4Cr-1Mo(12Cr2Mo) 720~750 1/2 1 1 1/2 2 3 4 5

2Cr-1/2Mo-VW(12Cr2MoWVB) 750~780 3/4 1 1/4 1 3/4 2 3 1/4 4 1/4 5 1/4

3Cr-1Mo-VTi(12Cr2MoVSiTiB) 750~780 3/4 1 1/4 1 3/4 2 3 1/4 4 1/4 5 1/4

9Cr-1Mo 750~780 1/2 1 1 1/2 2 1/4 3 4 5

12Cr-1Mo 750~780 1/2 1 1/2 2 3 4 5

6.0.5 In the course of heat treatment , the ramming of temperature rise and drop are stipulated as

follows:

6.0.5.1 The ramp of temperature rise and drop can be in general calculated by 250X25/wall thickness ℃/hour , but not more than 300℃/hour;

6.0.5.2 In the course of temperature rise and drop , control is not required when the temperature is lower than 300℃ .

6.0.6 For post-weld heat treatment of weld-joint of different kinds of steel , the steel materials on the

two sides and the welding electrodes (wires) to be used shall be taken into synthetically

consideration . The heat treatment temperature shall in general not exceed the lower critical point

Ac1 of that side of steel with lower content of alloy .

6.0.7 The width of heated band in heat treatment , measured from the center line of seam , shall be ,

on each side , not less than three times of the tube wall thickness , and , in any case , not less

than 60mm .

6.0.8 The width of heat insulated band shall not less 5 times of pipe wall thickness from the center

line of weld seam on each side , in order to reduce the temperature grade .

6.0.9 The heating method shall keep the temperature evenly distributed on the interior and exterior

walls of the tube and on both sides of the seam , with the temperature diffidence between any two measuring points in heated area lower than 50℃while temperature sustaining .

Resistance-heating or induction heating shall be adopted for welding pipes with wall thickness

more than 100mm .

6.0.10 The temperature in heat treatment must be measured accurately and recorded automatically .

The instruments , thermocouples , and their accessories shall be calibrated accordingly .

6.0.11 In heat treatment , temperature measuring points shall be located symmetrical about the

center line of the seam . The number of the measuring points shall not be less than 2 . The

measuring points for horizontal piping shall be located symmetrically in verticality .

6.0.12 After heat treatment , the welding joint shall be stamped on the operator’s number or other

durable marks . The record shall be made on heat treatment .

Chapter 7 Quality Inspection 7.0.1 Serious attention shall be paid to the checking and inspecting of welding quality , implementing

23

a system of welding quality tri-grade checking and inspecting , and a combined way of

operator's own and specialized inspecting , making the inspection and assessment work better .

Welding quality checking include three stages as pre-welding , interim welding and post welding

inspection , it shall be implemented strictly according to the items and procedures .

7.0.2 Method , scope and amount of inspection upon welding joints are shown in Table 7.0.2 , the

following requirements shall also be met :

Table 7.0.2

type of inspection method and ratio(%)

welding extent visual examination

joint self-inspec

tion

special-ins

pection

radiographic

inspection

ultrasonic

inspection

hardness

check

spectrum

analysis

Ⅰ boiler heating surface tubes with work

pressure≥ 9.81MPa 100 100 25 25 5 10

Ⅰ

boiler body tubes/pipes & fits with

external diameter >159mm or wall

thickness >20mm and work pressure

≥ 9.81MPa

100 100 100 100 100

Ⅰ steam pipes with external diameter

>159mm, work temp≥ 450℃ 100 100 100 100 100

Ⅰ steam , water , oil , gas pipes with

work pressure >8MPa 100 100 50 100 100

Ⅰ

steam/water tubes/pipes &fits with

work temperature:

300℃<work temp≤ 450℃

100 50 50 100 100

Ⅰ pressure vessel with work pressure is

at the range of 0.1~1.6MPa 100 50 50 100 100

type of method of inspection and inspection ratio(%)

welding extent visual examination

joint self-inspec

tion

special-ins

pection

radiographic

inspection

ultrasonic

inspection

hardness

check

spectrum

analysis

Ⅱ boiler heating surface tubes with work

pressure≤ 9.81MPa 100 25 25 5 -

Ⅱ

steam tubes/pipes & fits with work

temperature:

150℃< work temp ≤ 300℃

100 25 5 100 -

Ⅱ

steam , water , oil , gas pipes with

work pressure is at range of

4MPa~8MPa

100 25 5 100 -

24

Ⅱ

steam , water , oil , gas pipes with

work pressure is at the range of

1.6MPa~4MPa

100 25 5 - -

Ⅱ steel structure bearing the still load 100 25 3) - -

Ⅲ

steam , water , oil , gas pipe with work

pressure is at the range of

0.1MPa~1.6MPa

100 25 1 - -

Ⅲ exhaust gas, wind, coal , coal powder,

coal ash pipes & fits 100 25 4) - -

Ⅲ nonpressure steel structure and

sealing structure 100 10 - - - -

Ⅲ

common support structure

(equipment support, ladder , plate,

pull hole ect.)

100 10 - - - -

Ⅲ

scattering water , drain water, drain

dirty and sampling tubes/pipes of

boiler water pressure test extent with

external diameter <76mm

100 100 - - - -

7.0.2.1 Welding seams , which do not pass the visual inspection , shall not undergo other items of

inspection.

7.0.2.2 NDT shall be done after heat treatment if the welding joint needs to be heat treated .

7.0.2.3 After alloy steel being welded, spectral analysis shall be done according to the following

requirements:

(1) Boiler heating surface tubes not less than 10%

(2) other tubes and pipes 100%

(3) Spectral analysis shall be done according to the quantity of welding joints that the welder

completed that day.

7.0.4 In case the NDT results shows some welding joints unqualified , in addition the defects shall

be repaired , and double quantity inspection shall be done on the seams welded by the operator

on the day . If there are still unqualified welding joints , the seams welded by the operator on that

day shall be considered unqualified .

7.0.5 The disqualification cause shall be found out in order to take appropriate measures and to

execute the reparation . Inspection shall be redone after repairing .

7.0.6 In case the heat treatment automatic recording curve unnormal , spot-check of hardness shall

be taken . Hardness of random sampling parts exceeds the stipulated range , the number for

rechecking on that shift shall be doubled and the causes shall be found out . Those joints which

prove to be disqualified shall undergo heat treatment once more .

7.0.7 In order to reflect the quality condition , the first qualification ratio of NDT shall be calculated

25

statistically by part and by whole after welding inspection. The calculation formula is shown as

follows :

First inspection qualification ratio of NDT = A B

A− 100%

A is quantity of welding joints of first inspected (not including the equivalent quantity of

re-inspection and repeated double quantity inspection).

B is quantity of disqualified welding joints (including cutting out and patching ,cutting , redoing)

Chapter 8 Criterion for Quality 8.0.1 By visual inspection , the quality of welding seams shall conform with the following

requirement :

8.0.1.1 The edge of welding seam shall transit smoothly to the parent metal , the outline dimension

of welding seam shall conform with the requirements of the design , its allowable dimension

shown in Table 8.0.1-1 . Table 8.0.1-1 Allowable outline dimension of welding seams （mm）

joint type

welding seam

and position

types

Ⅰ

Ⅱ

Ⅲ

butt welding joint reinforcement flat position 0~2 0~3 0~4

other position ≯ 3 ≯ 4 ≤ 5

butt welding joint difference of flat position ≤ 2 ≤ 2 ≤ 3

reinforcement other position ≤ 2 <3 <4

butt welding joint width of welding seam wider than groove <4 ≤ 4 ≤ 5

increase each side <2 ≤ 2 ≤ 3

leg of fillet weld δ+(2~3) δ+(2~4) δ+(3~5)

fillet welding joint fillet welding deviation of weld leg

dimension

<2 ≤ 2 ≤ 3

fillet welding joint

groove fillet welding

leg of a

fillet weld

δ≤ 20

δ>20

δ±1.5

δ±2

δ±2

δ±2.5

δ±2.5

δ±3

deviation

of weld leg

dimension

δ≤ 20

δ>20

<2

<3

≤ 2

<3

≤ 3

<4

Notes: a. Sharp groove, with depth larger than 1mm, is not allowed to appear on weld surface which

should not lower than matrix surface.

b. Weld leg of lap angle weld should be same with components in thickness.

26

8.0.1.2 The allowable range of superficial defects of welding seams are shown in Table 8.0.1-2 .

Table 8.0.1-2 Allowable range of superficial defects of welding seams

welding seam types quality requirements

defect name Ⅰ Ⅱ Ⅲ

crack, lack of fusion not allowed

root incomplete penetration

not allowed

depth≯ 10%δ & ≯ 1.5mm

total length ≯ 10% welding

seam length

not allowed for the root

welding seam with tungsten

argon arc welding

depth≯ 15%δ & ≯ 2mm

total length ≯ 15% welding

seam length

blowhole, slag inclusion not allowed

undercut

not required to

be repaired

depth≯ 0.5mm

total length of both side:

for pipe, ≯ 10% total length

of welding seam, & ≯ 40mm;

for plate, ≯ 10% total length

of welding seam

depth≯ 0.5mm

total length of both side:

for pipe, ≯ 20% total length

of welding seam

for plate, ≯ 15% total length

of welding seam

depth≯ 0.5mm

total length of both side:

for pipe, ≯ 20% total length

of welding seam

for plate, ≯ 20% total length

of welding seam

required to be

repaired

not allowed

convex root

≯ 2mm

for plate and pipe with diameter ≥ 108mm: ≯ 3

for pipe with diameter <108mm , shall content passing ball

test requirements as following:

while pipe diameter ≥ 32mm, it is 85% of pipe internal

diameter, while pipe diameter <32mm, it is 75% of pipe

internal diameter

excessive penetration ≤ 1.5mm ≤ 2mm ≤ 2.5mm

8.0.1.3 The allowable limits of welding angular distortion shown in Table 8.0.1-3 .

Table 8.0.1-3 Allowable limits of welding angular distortion

welding pieces deviation

θ ( ° ) α (mm)

plate pieces ≯ 3 -

diameter of pipe <100mm － ≯ 1/100

diameter of pipe ≥ 100mm － ≯ 3/200

8.0.1.4 The tubes/pipes offset of external wall shall conform with following requirements:

27

(1) Boiler heating surface tubes： ≤ 10% δ ＋1mm

(2) Other pipes : ≤ 10%δ and ≤ 4mm.

8.0.2 The inspection criterion of NDT on welding seam shall conform with the following

standards :

8.0.2.1 Pressure piping : (1) SD143-85《 The Specification of Erection and Acceptance for Power Plant

Construction（Radiographic Inspection on Butt-welding Seams of Pressure Piping） 》.

(2) SD67-83《 The Specification of Erection and Acceptance for Power Plant

Construction（Ultrasonic Inspection on Welding Seams of Piping）》.

8.0.2.2 The quality grade stipulation on various weld seams shown in Tab. 8.0.2 .

Table 8.0.2 The quality grade stipulation on various weld seams

welding seam type Ⅰ Ⅱ Ⅲ

method of inspection extent of boiler exceed extent of boiler

radiographic inspection Ⅱ Ⅱ Ⅱ Ⅲ

ultrasonic inspection Ⅰ Ⅰ Ⅰ Ⅱ

8.0.3 The hardness of welding seam after heat treatment shall , in general , not exceed

the Brinell hardness (HB) of parent metal plus 100 , and not exceed the following

stipulated :

total alloy content <3% , HB≤ 270

total alloy content 3%~10% , HB≤ 300

total alloy content >10% , HB≤ 350

Chapter 9 Annex

Annex A Chemical Compositions, Mechanical Performance And Reference Datum of Common Steel

Products of Power Plants

Annex B Chemical Compositions And Constant Temperature Mechanical Performance of Deposited

Metal of Common Welding Rod

Annex C Chemical Compositions of Common Welding Wire

Annex A Chemical Compositions, Mechanical Performance And Reference Datum

for Common Steel Products in Power PlantsChemical compositions and mechanical performance of

28

common steel products of power plants are shown as table A.

Table A Chemical Compositions And Mechanical Performance

of Common Steel Products of Power Plants

Brand Number Chemical Compositions(%) Serial

Number Steel Number Standard

Number C Mn Si

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

A3

10

20

20G

22G

25

St35.8

St45.8

STPT38

STPT42

SB42

SB46

60

65

A-1

C

B

C

SB49

STPT49

12Mng

16Mng

16MnR

17Mn4

GB700

GB3087

GB3087

GB5031

GB713

GB699

DIN17175

DIN17175

JISG3456

JISG3456

JISG3103

JISG3103

ASTMA515

ASTMA515

ASTMA210

ASTMA178

ASTMA106

ASTMA106

JISG3103

JISG3456

GB713

GB713

GB6654

DIN17115/1

0.14~0.22

0.07~0.14

0.17~0.24

0.17~0.24 ≤ 0.26

0.22~0.30 ≤ 0.17

≤ 0.21

≤ 0.25

≤ 0.30

≤ 0.24

≤ 0.28

0.24~0.31

0.28~0.33 ≤ 0.27

≤ 0.35

≤ 0.30

≤ 0.35

≤ 0.31

≤ 0.33

≤ 0.16

0.12~0.20 ≤ 0.20

0.14~0.20

0.30~0.65

0.35~0.65

0.30~0.65

0.35~0.65

0.60~0.90

0.50~0.80

0.40~0.80

0.40~1.20

0.30~0.90

0.30~0.10 ≤ 0.90

≤ 0.90

≤ 0.90

≤ 0.90

≤ 0.93

≤ 0.8

0.29~1.06

0.29~1.06 ≤ 0.9

0.30~1.0

1.10~1.50

1.20~1.60

1.20~1.60

0.90~1.20

≤ 0.30

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.10~0.35

0.10~0.35

0.10~0.35

0.10~0.35

0.15~0.30

0.15~0.30

0.15~0.40

0.15~0.40 ≤ 0.10

—

≥ 0.10

≥ 0.10

0.15~0.30

0.10~0.35

0.20~0.60

0.20~0.60

0.20~0.60

0.20~0.40

To be continued

Chemical Compositions (%)

29

Cr Mo V Ni Ti B

—

≤ 0.15

≤ 0.25

—

—

≤ 0.25

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.25

≤ 0.25

—

—

≤ 0.25

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Serial Brand Number Chemical Compositions (%)

30

Number Steel

Number

Standard

Number W Nb Cu S P

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

A3

10

20

20G

22G

25

St35.8

St45.8

STPT38

STPT42

SB42

SB46

60

65

A-1

C

B

C

SB49

STPT49

12Mng

16Mng

16MnR

17Mn4

GB700

GB3087

GB3087

GB5031

GB713

GB699

DIN17175

DIN17175

JISG3456

JISG3456

JISG3103

JISG3103

ASTMA515

ASTMA515

ASTMA210

ASTMA178

ASTMA106

ASTMA106

JISG3103

JISG3456

GB713

GB713

GB6654

DIN17115/1

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.25

≤ 0.25

—

—

≤ 0.25

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.050

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.04

≤ 0.04

≤ 0.035

≤ 0.035

≤ 0.040

≤ 0.040

≤ 0.040

≤ 0.040

≤ 0.058

≤ 0.060

≤ 0.058

≤ 0.058

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.050

≤ 0.045

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.04

≤ 0.04

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.048

≤ 0.050

≤ 0.048

≤ 0.048

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.050

31

To be continued

Mechanical Performance of Constant Temperature Critical

Pointac1/Ac3 σ s σ b

(MPa)

δ s

(%)

α k

(J/cm2) HB

(MPa)

Class

Number

SD340-89

185~235

196

226

245

265

275

215~235

235~255 ≥ 215

≥ 245

≥ 225

≥ 245

≥ 220

≥ 240

≥ 255

≥ 255

≥ 240

≥ 275

≥ 265

≥ 274

275~295

245~345

265~345

274~284

3754~60

333~490

392~588

412~549

420~560

450

360~480

410~529 ≥ 372

≥ 412

412~540

451~588

415~550

450~585 ≥ 414

≥ 414

≥ 415

≥ 485

480~617 ≥ 480

430~590

440~655

450~655

460~548

21~26

24

20

24

24

23

≥ 25

≥ 23

≥ 22

≥ 30

≥ 22

≥ 20

19~21

18~21

18~21

27v

49u

59u

71u

59u

59u

27v

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -1

Ⅰ -2

Ⅰ -2

Ⅰ -2

Ⅱ A-1

Ⅱ A-1

Ⅱ A-1

Ⅱ A

32

Brand Number Chemical Compositions Serial

Number Steel Number Standard

Number C Mn Si

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

19Mn5

15MnVg

15MnVR

20MnMo

15MnMoV

14MnMoVg

18MnMoNbg

12CrMo

15CrMo

12CrMoV

12Cr1MoV

ZG15Cr-1Mo1V

ZG20Cr-MoV

A

T1

P1

T11

P11

P12

P2

WC6

WC9

SB46M

STBA12

STBA13

STBA12

DIN17175

GB713

GB6654

JB755

JB755

GB713

GB713

GB5310

GB5310

GB3077

GB5310

JB2640

JB2640

ASTMA204

ASTMA209

ASTMA335

ASTMA213

ASTMA335

ASTMA335

ASTMA335

ASTMA217

ASTMA217

JISG3103

JISG3462

JISG3462

JISG3458

0.17~0.22

0.10~0.18 ≤ 0.18

0.17~0.23

0.12~0.18

0.10~0.18

0.17~0.23

0.08~0.15

0.12~0.18

0.18~0.15

0.08~0.15

0.14~0.20

0.18~0.25 ≤ 0.18

0.10~0.20

0.10~0.20 ≤ 0.15

≤ 0.15

≤ 0.15

0.10~0.20 ≤ 0.20

≤ 0.18

≤ 0.18

0.10~0.20

0.15~0.25

0.10~0.20

1.00~1.30

1.20~1.60

1.20~1.60

1.10~1.40

1.30~1.60

1.20~1.60

1.35~1.65

0.40~0.70

0.40~0.70

0.40~0.70

0.40~0.70

0.40~0.70

0.40~0.70 ≤ 0.90

0.30~0.80

0.30~0.80

0.30~0.60

0.30~0.60

0.30~0.61

0.30~0.61

0.50~0.80

0.40~0.70 ≤ 0.90

0.30~0.80

0.30~0.80

0.30~0.80

0.30~0.60

0.20~0.50

0.20~0.60

0.17~0.37

0.17~0.37

0.20~0.50

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.17~0.37

0.15~0.40

0.10~0.50

0.10~0.50

0.50~1.00

0.50~1.00 ≤ 0.50

0.10~0.30 ≤ 0.60

≤ 0.60

0.15~0.30

0.10~0.50

0.10~0.50

0.10~0.50

33

To be continued

Chemical Compositions (%)

Cr Mo V Ni Ti B

≤ 0.30

—

—

—

—

—

—

0.40~0.70

0.80~1.10

0.30~0.60

0.90~1.20

1.20~1.70

0.90~1.20 —

—

—

1.00~1.50

1.00~1.50

0.80~1.25

0.50~0.81

1.00~1.50

2.00~2.75 —

—

—

—

—

—

—

0.20~0.35

0.4~0.65

0.40~0.65

0.45~0.65

0.40~0.55

0.40~0.55

0.25~0.35

0.25~0.35

1.00~1.20

0.50~0.70

0.41~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.44~0.65

0.90~1.20

0.45~0.60

0.45~0.65

0.45~0.65

0.45~0.65

—

0.04~0.12

0.04~0.12 —

0.05~0.15

0.05~0.15 —

—

—

0.15~0.30

0.15~0.30

0.20~0.40

0.20~0.30 —

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.50

≤ 0.50

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

34

Brand number Chemical compositions (%) Serial

number Steel number Standard

number W Nb Cu S P

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

19Mn5

15MnVg

15MnVR

20MnMo

15MnMoV

14MnMoVg

18MnMoNbg

12CrMo

15CrMo

12CrMoV

12Cr1MoV

ZG15Cr-1Mo1V

ZG20Cr-MoV

A

T1

P1

T11

P11

P12

P2

WC6

WC9

SB46M

STBA12

STBA13

STPA12

DIN17175

GB713

GB6654

JB755

JB755

GB713

GB713

GB5310

GB5310

GB3077

GB5310

JB2640

JB2640

ASTMA204

ASTMA209

ASTMA335

ASTMA213

ASTMA335

ASTMA335

ASTMA335

ASTMA217

ASTMA217

JISG3103

JISG3462

JISG3462

JISG3458

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.10

≤ 0.10

—

—

—

—

—

—

—

—

—

—

0.025~0.050—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.50

≤ 0.50

—

—

—

—

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.03

≤ 0.03

≤ 0.040

≤ 0.045

≤ 0.045

≤ 0.030

≤ 0.030

≤ 0.045

≤ 0.045

≤ 0.030

≤ 0.045

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.03

≤ 0.03

≤ 0.035

≤ 0.045

≤ 0.045

≤ 0.030

≤ 0.030

≤ 0.045

≤ 0.045

≤ 0.035

≤ 0.04

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

35

To be continued

Mechanical Performance of Constant Temperature Critical

Point

Ac1/Ac3

σ s σ b

(MPa)

δ s

(%)

α k

(J/cm2) HB

(MPa)

Class

Number

SD340-89

300~310

335~390

335~390

353~372

441

490

440~510

206

235

225

255

343

313

255

207

207

207

207

207

207

275

275

255

206

206

206

510~610

490~675

490~675

370~529

588

635

590~635

412~559

441~638

440

471~638

490

490

450~585

378

379

413

413

413

379

482~655

482~655

451~588

382

412

382

19

17~18

17~18

18

17

16

16~17

21

21

22

21

14

14

23

22

22

30

22

22

22

20

20

59u

34v

47u

55u

69u

69u

59u

78u

59u

29.4u

29.4u

149~217

156~228

146

163

Ⅱ A

Ⅱ A-2

Ⅱ A-2

Ⅱ A-2

Ⅱ B-1

Ⅱ B-2

Ⅱ B-2

Ⅲ -2

Ⅲ -2

Ⅲ -3

Ⅲ -3

Ⅲ -3

Ⅲ -3

Ⅲ -1

Ⅲ -1

Ⅲ -1

Ⅲ -2

Ⅲ -2

Ⅲ -2

Ⅲ -1

Ⅲ -1

Ⅲ -1

Ⅲ -1

Ⅲ -1

36

Brand Number Chemical Compositions (%) Serial

Number Steel Number Standard

Number C Mn Si

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

STBA22

STBA20

STPA20

STBA23

STPA22

STPA23

SCPH21

15Mo3

13CrMo44

14MoV63

12Cr2MoWVT1B

12Cr3MoVSiTiB

12Cr2Mo

P22

STPA24

10CrMo910

1Cr5Mo

10Cr5MoWVTiB

P5

P9

STPA25

STPA26

X20CrMoV121

1Cr13

0Cr13Al

1Cr18Ni9

0Cr23Ni13

JISG3462

JISG3462

JISG3458

JISG3462

JISG3458

JISG3458

JISG5151

DIN17155/2

DIN17155

DIN17155

GB5310

GB5310

GB5310

ASTMA335

JISG3458

DIN17175

J B755

ASTMA335

ASTMA335

JISG3458

JISG3458

DIN17175

GB1220

GB1220

GB1220

GB1220

≤ 0.15

0.10~0.20

0.10~0.20 ≤ 0.15

≤ 0.15

≤ 0.15

≤ 0.20

0.12~0.20

0.10~0.18

0.10~0.18

0.08~0.15

0.09~0.15

0.08~0.15 ≤ 0.15

≤ 0.15

0.08~0.15 ≤ 0.15

0.07~0.12 ≤ 0.15

≤ 0.15

≤ 0.15

≤ 0.15

0.17~0.23 ≤ 0.15

≤ 0.08

≤ 0.15

≤ 0.08

0.30~0.60

0.30~0.60

0.30~0.60

0.30~0.60

0.30~0.60

0.30~0.60

0.50~0.80

0.50~0.70

0.40~0.70

0.40~0.70

0.45~0.65

0.50~0.80

0.40~0.70

0.30~0.60

0.30~0.60

0.40~0.70 ≤ 0.60

0.45~0.70

0.30~0.60

0.30~0.60

0.30~0.60

0.30~0.60 ≤ 1.00

≤ 1.00

≤ 1.00

≤ 2.00

≤ 2.00

≤ 0.50

0.10~0.50

0.10~0.50

0.50~1.00 ≤ 0.50

0.50~1.00 ≤ 0.60

0.15~0.35

0.10~0.35

0.10~0.35

0.45~0.75

0.60~0.90 ≤ 0.50

≤ 0.50

≤ 0.50

≤ 0.50

≤ 0.50

0.40~0.70 ≤ 0.50

0.25~1.00 ≤ 0.50

0.251.00 ≤ 0.50

≤ 1.00

≤ 1.00

≤ 1.00

≤ 1.00

37

To be continued

Chemical Compositions (%)

Cr Mo V Ni Ti B

0.80~1.25

0.50~0.80

0.50~0.80

1.00~1.50

0.80~1.25

1.00~1.50

1.00~1.50 —

0.70~1.10

0.30~0.60

1.60~2.10

2.50~3.00

2.00~2.50

1.90~2.60

1.90~5.60

2.00~2.50

4.00~6.00

4.50~6.00

4.00~6.00

8.00~10.00

4.00~6.00

8.00~10.00

10.00~12.50

11.50~13.50

11.50~14.50

17.00~19.00

22.00~24.00

0.45~0.65

0.40~0.65

0.40~0.65

0.45~0.65

0.45~0.65

0.45~0.65

0.45~0.65

0.25~0.35

0.45~0.65

0.50~0.70

0.50~0.65

1.00~1.20

0.90~1.20

0.87~1.13

0.87~1.13

0.90~1.20

0.40~0.60

0.48~0.65

0.45~0.65

0.90~1.10

0.45~0.65

0.90~1.10

0.80~1.20 —

—

—

—

—

—

—

—

—

—

—

—

—

0.22~0.32

0.28~0.42

0.25~0.35 —

—

—

—

—

0.20~0.33 —

—

—

—

0.25~0.35 —

—

—

—

—

—

—

—

—

—

≤ 0.50

—

—

—

—

—

—

—

—

—

≤ 0.60

—

—

—

—

—

0.30~0.80 ≤ 0.60

—

8.00~10.00

12.00~15.00

—

—

—

—

—

—

—

—

—

—

0.08~0.18

0.22~0.38 —

—

—

—

—

0.16~0.24 —

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.008

0.005~0.011 —

—

—

—

—

0.008~0.014 —

—

—

—

—

—

—

—

—

38

Brand number Chemical compositions (%) Serial

number Steel number Standard

number W Nb Cu S P

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

STBA22

STBA20

STPA20

STBA23

STPA22

STPA23

SCPH21

15Mo3

13CrMo44

14MoV63

12Cr2MoWVT1B

12Cr3MoVSiTiB

12Cr2Mo

P22

STPA24

10CrMo910

1Cr5Mo

10Cr5MoWVTiB

P5

P9

STPA25

STPA25

X20CrMoV121

1Cr13

0Cr13Al

1Cr18Ni9

0Cr23Ni13

JISG3462

JISG3462

JISG3458

JISG3462

JISG3458

JISG3458

JISG5151

DIN17155/2

DIN17155

DIN17155

GB5310

GB5310

GB5310

ASTMA335

JISG3458

DIN17175

J B755

ASTMA335

ASTMA335

JISG3458

JISG3458

DIN17175

GB1220

GB1220

GB1220

GB1220

—

—

—

—

—

—

≤ 0.10

—

—

—

0.30~0.55—

—

—

—

—

—

0.20~0.40—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.50

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

≤ 0.035

≤ 0.030

≤ 0.040

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

≤ 0.030

≤ 0.035

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

≤ 0.035

≤ 0.030

≤ 0.040

≤ 0.040

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.030

≤ 0.030

≤ 0.035

≤ 0.035

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.030

≤ 0.035

≤ 0.035

≤ 0.035

≤ 0.035

To be continued

39

Mechanical Performance of Constant Temperature Critical

Point

Ac1/Ac3

σ s σ b

(MPa)

δ s

(%)

α k

(J/cm2) HB

(MPa)

Class

Number

SD340-89

206

206

206

206

206

206

274

265~274

280~290

310~319

343

441

280

207

206

269~280

392

392

207

207

206

206

490

343

177

206

206

412

412

412

412

412

412

480

431~519

440~590

460~610

540~736

608~804

450~600

413

412

450~600

588

539~735

413

413

412

412

690~840

539

412

520

520

22

22

18

16

20

22

18

18

22

22

17

25

20

40

40

55u

98.1u

98.1u

156~241

≥ 159

≤ 183

≤ 187

≤ 187

685~815

Ⅲ -2

Ⅲ -1

Ⅲ -1

Ⅲ -2

Ⅲ -2

Ⅲ -2

Ⅲ -1

Ⅲ -2

Ⅲ -2

Ⅳ

Ⅳ

Ⅳ

Ⅳ

Ⅳ

Ⅳ

Ⅴ

G106 Ⅴ

Ⅴ

Ⅴ

Ⅴ

Ⅴ

Ⅵ

Ⅶ

Ⅷ

Ⅷ

40

Annex B Chemical Compositions And Mechanical Performance at Normal Temperature of Clad Metal

for Common Welding Rods

Chemical compositions and mechanical performance at normal temperature of clad metal for common

welding rods are shown as table B.

Table B Chemical Compositions And Mechanical Performance at Normal Temperature

of Clad Metal for Common Welding Rods

Model of Welding Rod Chemical Compositions (%)

Serial

Number Model Standard

Number

Original

Brand

Number

C Mn

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

E4303

E4301

E4320

E4316

E4315

E5001

E5016

E5015

E6015D1

E7015D2

E5003A1

E5015A1

E5503B1

E5515B1

E5503B2

E5515B2

E5503B2V

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

J 422

J 423

J 424

J 426

J 427

J 503

J 506

J 507

J 607

J 707

R 102

R 107

R 202

R 207

R 302

R 307

R 312

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

≤ 0.12

0.15 —

0.12

0.05~0.12

0.05~0.12 ≤ 0.12

0.05~0.12 ≤ 0.12

0.30~0.60

0.35~0.60

0.50~0.90

0.50~0.90

0.50~0.90

0.50~1.00

0.80~1.40

0.80~1.40

1.25~1.75

1.65~2.00 —

0.90

0.90

0.90

0.50~0.90

0.90

0.50~0.90

41

Chemical Compositions (%)

Si Cr Mo V Nb B

≤ 0.25

≤ 0.20

≤ 0.15

≤ 0.50

≤ 0.50

≤ 0.30

≤ 0.65

≤ 0.70

0.60

0.60 —

0.60

0.60

0.60 ≤ 0.50

0.60 ≤ 0.50

—

—

—

—

—

—

—

—

—

—

—

—

0.40~0.65

0.40~0.65

0.70~1.10

1.00~1.50

0.80~1.20

—

—

—

—

—

—

—

0.25~0.45

0.25~0.45 —

0.40~0.65

0.40~0.65

0.40~0.65

0.40~0.65

0.40~0.70

0.40~0.65

0.40~0.70

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

0.10~0.35

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

42

Model of Welding Rod Chemical Compositions (%)

Serial

Number Model Standard

Number

Original

Brand

Number

W Ni

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

E4303

E4301

E4320

E4316

E4315

E5001

E5016

E5015

E6015D1

E7015D2

E5003A1

E5015A1

E5503B1

E5515B1

E5503B2

E5515B2

E5503B2V

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5117

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

J 422

J 423

J 424

J 426

J 427

J 503

J 506

J 507

J 607

J 707

R 102

R 107

R 202

R 207

R 302

R 307

R 312

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

43

To be continued Mechanical Performance of Constant

Temperature Chemical Compositions (%) Class Number

Re σ b(Mpa) δ s(%) α k(J/cm2) SD340-89

— S2≤ 0.035

P2≤ 0.050 412 ≥ 18 78.4 Ⅰ -1

— S≤ 0.035

P≤ 0.050 412 ≥ 18 78.4 Ⅰ -1

— S≤ 0.035

P≤ 0.050 412 ≥ 18 78.4 Ⅰ -1

— S≤ 0.035

P≤ 0.040 412 ≥ 22 137.2 Ⅰ -1

— S≤ 0.035

P≤ 0.040 412 ≥ 22 137.2 Ⅰ -1

— S≤ 0.035

P≤ 0.050 490 ≥ 16 58.8 Ⅰ -2

— S≤ 0.035

P≤ 0.040 490 ≥ 20 127.4 Ⅰ -2

— S≤ 0.035

P≤ 0.040 490 ≥ 20 127.4 Ⅰ -2

— S≤ 0.035

P≤ 0.035 588 ≥ 15 ≥ 27ν Ⅱ 4-2

— S≤ 0.035

P≤ 0.035 610 ≥ 15 Ⅱ 8

— S≤ 0.035

P≤ 0.040 490 ≥ 20 Ⅲ -1

— S≤ 0.035

P≤ 0.035 490 ≥ 22 Ⅲ -1

— S≤ 0.035

P≤ 0.035

540 ≥ 16 Ⅲ -2

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅲ -2

—

S≤ 0.035

P≤ 0.040 490 ≥ 16 78.4u Ⅲ -2

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅲ -2

44

S≤ 0.035 —

P≤ 0.040 490 ≥ 16 Ⅲ -3

Model of Welding Rod Chemical Compositions (%)

Serial

Number Model Standard

number

Original

brand

number

C Mn

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

E5515B2V

E6003B3

E6015B3

E5515B3VNb

E5515B2VWB

E5515B2VW

E5515B2VNb

E1-5McV-15

E1-9Mo-15

E2-11MoVN1-15

E2-11MoVNiW-15

E1-13-15

E6-19-10Nb-

E4-18-12Mo2-

E1-23-13-

E2-26-21-

E1-16-25Mo6N

E7-17-

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

R 317

R 402

R 407

R 417

R 347

R 327

R 337

R 507

R 707

R 807

R 817

R 827

G 207

G 217

A 132/A 137

A 202/A 207

A 302/A 307

A 402/A 407

A 507

G 302/G 307

0.05~0.12

0.05~0.12

0.05~0.12

0.05~0.12

0.05~0.12

0.05~0.12

0.05~0.12

0. 12

0.10

0.19

0.19

0.15~0.21

0.12 ≤ 0.12

0.08

0.08

0.15

0.20

0.12

0.10

0.90

0.90

0.90

0.90

1.00

0.70~1.10

0.60

0.50~0.90

1.00

0.50~1.00

0.5~1.00

0.50~1.00

1.00 ≤ 1.00

0.5~2.5

0.5~2.5

0.5~2.5

1.0~2.5

0.5~2.5

1.0

45

46

To be continued

Chemical Compositions (%)

S1 Cr Mo V Nb B

0.60

0.60

0.60

0.60

0.60

0.60

0.60

0.50

0.90

0.50

0.50 ≤ 0.50

0.90 ≤ 0.90

0.90

0.90

0.90

0.75

0.90

0.90

1.00~1.50

2.00~2.50

2.00~2.50

2.10~3.00

1.50~2.50

1.00~1.50

1.00~1.50

4.5~6.00

8.0~10.5

9.5~11.5

9.5~12.0

9.50~12.00

11.00~13.50

12.00~14.00

18.00~21.00

17.0~20.0

22.0~25.0

25.0~28.0

14.0~18.0

14.0~18.0

0.40~1.65

0.90~1.20

0.90~1.20

0.70~1.00

0.30~0.80

0.70~1.00

0.70~1.00

0.40~0.70

0.85~1.20

0.60~0.90

0.80~1.10

0.80~1.10

0.50

0.50

2.0~2.5

0.50

0.50

5.0~7.0

0.50

0.10~0.35 —

—

0.25~0.50

0.20~0.60

0.20~0.35

0.15~0.40

0.10~0.35 —

0.20~0.40

0.20~0.40

0.20~0.40 —

—

—

—

—

—

—

—

—

—

—

0.35~0.65 —

—

0.10~0.25 —

—

—

—

—

—

—

8×C~1.00

—

—

—

—

—

—

—

—

—

0.001~0.003 —

—

—

—

—

—

—

—

—

—

—

—

—

—

—

47

Model of Welding Rod Chemical Compositions (%)

Serial

Number Model Standard

Number

Original

Brand

Number

W Ni

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

E5515B2V

E6003B3

E6015B3

E5515B3VNb

E5515B2VWB

E5515B2VW

E5515B2VNb

E1-5McV-15

E1-9Mo-15

E2-11MoVN1-15

E2-11MoVNiW-15

E1-13-15

E6-19-10Nb-

E4-18-12Mo2-

E1-23-13-

E2-26-21-

E1-16-25Mo6N

E7-17-

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB5118

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

GB983

R 317

R 402

R 407

R 417

R 347

R 327

R 337

R 507

R 707

R 807

R 817

R 827

G 207

G 217

A 132/A 137

A 202/A 207

A 302/A 307

A 402/A 407

A 507

G 302/G 307

—

—

—

—

0.20~0.60

0.25~0.50 —

—

—

—

0.40~0.70 —

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

0.40

0.60~0.90

0.40~1.10

0.70~1.10

0.60 ≤ 0.60

9.0~11.0

11.0~14.0

12.0~14.0

20.0~22.5

22.0~27.0

0.60

48

To be continued

Mechanical Performance of Constant

Temperature Chemical Compositions (%) Class Number

Re Others σ b(Mpa) δ s(%) α k(J/cm2) SD340-89

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅲ -3

— S≤ 0.035

P≤ 0.035 590 ≥ 14 Ⅳ

— S≤ 0.035

P≤ 0.035 590 ≥ 15 Ⅳ

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅳ

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅳ

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅲ -3

— S≤ 0.035

P≤ 0.035 540 ≥ 17 Ⅲ -3

Cu20.50 S≤ 0.030

P≤ 0.035 540 ≥ 14 Ⅴ -1

Cu20.50 S≤ 0.030

P≤ 0.035 590 ≥ 16 Ⅴ -2

Cu20.50 S≤ 0.030

P≤ 0.035 730 ≥ 15 Ⅴ -3

Cu20.50 S≤ 0.030

P≤ 0.035 730 ≥ 15 Ⅴ -3

— S≤ 0.035

P≤ 0.040 Ⅴ -3

Cu20.50 S≤ 0.030

P≤ 0.035 450 ≥ 20 Ⅵ

— S≤ 0.030

P≤ 0.040 Ⅵ

Cu20.50 S≤ 0.030

P≤ 0.035 520 ≥ 25 Ⅷ

Cu20.50 S≤ 0.030

P≤ 0.035 520 ≥ 30 Ⅷ

Cu20.50 S≤ 0.030

P≤ 0.035 550 ≥ 25 Ⅷ

49

S≤ 0.030 Cu20.50

P≤ 0.030 550 25 Ⅷ

Cu20.50 N≥ 0.1

S≤ 0.030

P≤ 0.035 610 30

Cu20.50 S≤ 0.030

P≤ 0.035 450 20 Ⅶ

Annex C Chemical Compositions of Common Welding Wire

Chemical compositions of common welding wire are shown as table C.

Table C Chemical Compositions of Common Welding Wire Chemical Compositions (%) Serial

Number Steel Number Standard Number C Mn Si Cr Mo

1 H08A 0.30~0.55 ≤ 0.03

2 H08MnA GB1300-77

0.80~1.10 ≤ 0.07 ≤ 0.20

3 H08MnR YB/Z11-76

≤ 0.10

1.00~1.30 0.10~0.30 —

4 H08Mn2SiA ≤ 0.11 1.80~2.10 0.65~0.95

5 H10Mn2 ≤ 0.12 1.50~1.90 ≤ 0.07 ≤ 0.20

—

6 H08CrMoA ≤ 0.10 0.80~1.10

7 H13CrMoA 0.11~0.16 0.80~1.00 0.40~0.60

8 H08CrMoV

GB/Z1300-77

0.40~0.70 0.15~0.35

1.00~1.30

9 H08CrMnSiMoVA 1.20~1.50 0.60~0.90 0.95~1.25 0.50~0.70

10 H08Cr2MoA YB/Z11-76

≤ 0.10

0.40~0.70 0.15~0.35 2.00~2.50 0.90~1.20

11 H1Cr13 ≤ 0.15 0.30~0.60 0.30~0.60 12.00~14.00

12 H1Cr19Ni9 ≤ 0.14 0.50~1.00

13 H0Cr19Ni9Si2 ≤ 0.06 2.00~2.75

14 H1Cr19Ni9Ti ≤ 0.10 0.30~0.70

15 H1Cr19Ni10Nb ≤ 0.09 0.30~0.80

18.00~20.00

16 H1Cr25Ni13 ≤ 0.12 0.30~0.70 23.00~26.00

17 H1Cr25Ni20

GB1300-77

≤ 0.15

1.00~2.00

0.20~0.50 24.00~27.00

18 TIG-J50 — 0.06~0.12 1.20~1.50 0.60~0.85 —

—

50

19 TIG-R31 1.10~1.40 0.45~0.65

20 Tig-R40 0.75~1.05 0.45~0.70

2.20~2.50 0.95~1.25

21 TIG-R10 0.75~1.05 —

22 TIG-R30 0.75~1.050.45~0.70

1.10~1.40 0.45~0.65

51

Chemical Compositions (%) S P

V Notes Ti Nb Ni Rare earth Others Not larger

than

≤ 0.30

0.10

(addition amount)

A10.05 (addition amount)

0.30 0.30

0.40 0.40

—

0.15~0.35

≤ 0.30

0.20~0.40 ≤ 0.25

≤ 0.60

—

0.030 0.030

0.50~0.80

—

8.00~10.00

1.20~1.50 9.00~11.00

12.00~14.00—

17.00~20.00

— —

0.020

A10.05~0.15Zr0.04~0.10

—

0.03~0.06

0.23~0.35

—

0.03~0.06

—

— 0.05

(addition amount) —

0.25 0.25

Standards of

Shanghai power plant

erection factory.

52