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HISTAR®Innovative high strength steelsfor economical steel structures

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HISTAR®Innovative high strength steelsfor economical steel structures

CONTENTS

1. INTRODUCTION 3

2. CHARACTERISTICS OF THE HISTAR STEELS 4

2.1. PRODUCTS DESCRIPTION 4

2.2. CHEMICAL COMPOSITION AND MECHANICAL PROPERTIES 5

2.3. TYPES OF SECTIONS 5

3. HOW DO HISTAR STEELS HELP TO REDUCE

THE WEIGHT OF THE STEEL STRUCTURES ? 6

4. FABRICATION GUIDELINES 8

4.1. GENERAL 8

4.2. MACHINING 8

4.3. FLAME CUTTING 8

4.4. WELDING 8

4.4.1. PREHEAT TEMPERATURES 8

4.4.2. WELDING CONSUMABLES 10

4.5. STRESS RELIEVING 11

4.6. FLAME STRAIGHTENING 11

4.7. HOT FORMING 11

4.8. COLD FORMING 11

4.9. GALVANIZING 11

4.10. BEAM FINISHING 11

5. TECHNICAL DELIVERY CONDITIONS 12

5.1. ROLLING TOLERANCES 12

5.2. MECHANICAL TESTING 12

5.3. ULTRASONIC TESTING 12

5.4. CERTIFICATION 12

5.5. SURFACE CONDITIONING 12

6. GENERAL DELIVERY CONDITIONS 13

7. QUALITY ASSURANCE 13

8. HISTAR STEELS PROTECT THE ENVIRONMENT 14

9. TECHNICAL ADVISORY FOR OUR CUSTOMERS 16

CHAPTERS

With the development of the HISTAR steels, Arcelor has succeeded to create structural steels combining high yieldstrength with excellent toughness at low temperatures andoutstanding weldability. These material properties were considered incompatible until now.

This development was made possible by the innovative “in line” Quenching and Self-Tempering (QST)process, developed by Arcelor in cooperation with theCentre de Recherches Métallurgiques in Liège.

The QST process enables the cost-effective production ofhigh-strength steels. HISTAR steels are in full compliancewith European and national standards.

Hot rolled H-beams in HISTAR grades enable the constructionof innovative and competitive structures. Engineerstake full advantage of the excellent HISTAR properties when designing gravity columns of high-rise buildings, long-spantrusses and offshore structures. Furthermore, the newsteels are recommended in case of stress gover-ned as well as seismic design.

With HISTAR, ARCELOR Sections satisfies theneeds of the designers for light and economicalstructures which fulfil at the same time the crite-ria of safety and sustainability.

1.INTRODUCTION

3

4

2.1. PRODUCT DESCRIPTION

HISTAR are structural steel grades with a low alloy content,combining high strength, good toughness andsuperior weldability. HISTAR grades are available withminimum yield strengths of 355 or 460 MPa.

When compared to standard structural steels, HISTAR grades feature improved guaranteed mechanicalcharacteristics over the whole range of productthicknesses (Figure 1). In order to best suit the differentapplications, HISTAR grades are available with guaranteedtoughnesses down to -20° C and down to -50° C.

HISTAR steels are delivered in the thermomechanically rolledcondition and comply with the requirements of the Europe-an standards EN 10113-3:1993 for weldable fine grainstructural steels and EN 10225:2001 for weldable structuralsteels for fixed offshore structures. They also comply withother national standards like ASTM A 913-02 and JIS G3106:1995. Table 1 shows a comparison, based on yield strength, between HISTAR and other standard structural steel grades. HISTAR grades are compatible with the requirements of the Eurocodes for the design of steel structures and composite steel-concrete structures.

The HISTAR grades for offshore applications offer thefollowing additional features:

• improved deformation properties in through thicknessdirection with respect to the resistance to lamellar tearing(Z qualities).

• notch impact properties in transverse direction.• maximum ratio between yield strength and tensile strength.

Different HISTAR grades are available in the market:

for general construction:HISTAR 355fulfils the requirements of S355 M–EN 10113-3:1993HISTAR 355 Lfulfils the requirements of S355 ML–EN 10113-3:1993HISTAR 460fulfils the requirements of S460 M–EN 10113-3:1993HISTAR 460 Lfulfils the requirements of S460 ML–EN 10113-3:1993

for offshore applications:HISTAR 355 TZ OSfulfils the requirements of S355 G11+M–EN 10225:2001HISTAR 355 TZK OSfulfils the requirements of S355 G12+M–EN 10225:2001HISTAR 460 TZ OSfulfils the requirements of S460 G3+M–EN 10225:2001HISTAR 460 TZK OSfulfils the requirements of S460 G4+M–EN 10225:2001

2. CHARACTERISTICS OF THE HISTAR STEELS

> 2.1. PRODUCT DESCRIPTION > 2.2. CHEMICAL COMPOSITION AND MECHANICAL PROPERTIES > 2.3. TYPES OF SECTIONS

Table 1: Comparison table for HISTAR grades

HISTAR YIELD

STRENGTH

(MPa)

355

460

European and national standards

NF A 35-501

E 36

DIN 17102

St E 355

St E 460

DIN 17100

St 52-3

BS 4360

50 D

55 C

EN 10025:

1993

S355

EN 10225:

2001

S355

S460

ASTM

A913-02

Gr 50

Gr 65

JIS

G3106:1995

SM 490 B/C/YB

SM 570

Previous standards

Standards

EN 10113-3:

1993

S355

S460

NF A 35-504

NF A 36-201

E 355

E 460

2.2. CHEMICAL COMPOSITION AND MECHANICALPROPERTIES

The chemical composition and the mechanical propertiesof the HISTAR grades are given in Table 4 and 5 for generalconstruction and in Table 6 and 7 for offshore applications.

2.3. TYPES OF SECTIONS

HISTAR grades are available for HE-beams ≥ 260mm and IPE beams ≥ 500 mm. The correspondingASTM A6 and the BS 4 shapes are also available.

The maximum flange thickness is:• 125 mm for HISTAR 355 / 460.• 63 mm for HISTAR 355 L / 460 L.• 40 mm for HISTAR Offshore grades (sections with flangethickness > 40 mm are subject to agreement).

Additional information is given in the Arcelor sales programmefor long products.

5

2.

500

450

400

350

300

0

460

440

355

345335

430

16 25 5040 63 10075 125

S460 M

S355 M

HISTAR 355

HISTAR 460

Figure 1: Minimum yield strength of HISTAR steels and EN 10113-3:1993 steel grades according to the material thickness

Material thickness [mm]

Min. yield strength [MPa]

HOW DO HISTAR STEELS HELP TO REDUCE

THE WEIGHT OF THE STEEL STRUCTURES ?

High strength HISTAR grades allow, in comparison with conventional structural steels, to reduce the weight and material costs of steel structures, and to cut welding and assembly time (see Figures 2,3 and 4).

Due to the high yield strength of HISTAR beams, it is pos-sible to substitute complicated and expensivebuilt-up sections by economical hot rolled beams(see Figure 5).

6

3.

149 %156 %

S235HE 280 M

4 161

S355HE 320B3 984

HISTAR 460HE 300 A

3 997

Steel gradeSection

Ultimate load (kN)

68 %70 %

100 %

Relativeweight

Relativematerial costs

Buc

klin

g leng

th: 3,5

m

Figure 2: Economical use of HISTAR steel in columns

82 %

62 %

HISTAR 460HD 400 x 1086

42 608 1086

S355HD 400 x 1086

+ plates42 2851332

S355Box column

42 5291357

Steel gradeSection

Ultimate load (kN) Weight (kg/m)

125 11535

130

102 %

120 %

100 %

Fabricationcosts

Weightper meter

Buc

klin

g leng

th: 4,5

m

90

Figure 5: Economical use of a HISTAR column compared tobuilt-up sections

60 000

50 000

40 000

30 000

20 000

10 000

0

20 3 4 5 6 7 8 9 10 11 12 13 14 15

Ultimate

load (kN)

Buckling length [m]

relative ultimate load

141 %

100 % HD 400 x 1086

125

L

71 %

Ultimate load for columnsHISTAR 460

S 355S 355

S 235S 235

Figure 4: Influence of the slenderness on the load carryingcapacity of the columns in HISTAR and conventional steels

Figure 3 : Economical use of HISTAR steel in heavy columns

160 %156 %

S235HD 400 x 1086

21 909

S355HD 400 x 677

22 345

HISTAR 460HD 400 x 463

22 870

Steel gradeSection

Ultimate load (kN)

68 %70 %

100 %

Relativeweight

Relativematerial costs

Buc

klin

g leng

th: 3,5

m

In case of bending, the required cross section and fabricationcost can be reduced by using beams in HISTAR grades (see Figure 6).

HISTAR grades develop their full potential in the design oftension members in trusses. Here, they not only allowto save material costs by taking full advantageof the high yield strength. The reduction of the deadload of the truss leads to the design of even thinner sections,resulting in additional savings in fabrication costs(see Figure 7).

3.

7

S235HE 1000 B

1 250

S355HE 900 A

1 250

HISTAR 460HE 700 A

1 250

Steel gradeSection

Ultimate load (kN)

Weightrelative to grade S 355

Material costsWeld volume

100 %

125 %112 %

110 %81 %87 %

70 %

7 m

S235HD 400 X 1086

25 636

S355HD 400 X 634

26 259

HISTAR 460HD 400 X 463

27 119

Steel gradeSection

Ultimate load (kN)

Weight relative to grade S 355

Material costsWeld volume*

100 %

171 %

175 %174 %

73 %78 %

53%

* Weld volume* Weld volume

Figure 6: Economical use of HISTAR beams as girders

Figure 7: Economical use of HISTAR beams in truss applications

4.1. GENERAL

The general recommendations given in this chapter shall beobserved to ensure the successful fabrication, welding, andheat treatment of the fine-grained high-strength HI-STAR 355 and HISTAR 460 steels for structural andoffshore applications.

For aspects not covered within these guidelines, it is recommended to ask the advice of Arcelor.

4.2. MACHINING

HISTAR 355/460 beams can be machined underthe same conditions as structural steels featuringthe same level of tensile strength. Tool wear from dril-ling and cutting of beams in HISTAR grades is similar to theone of beams in structural grades of the same level of strength.

4.3. FLAME CUTTING

HISTAR 355/460 beams can be cut with a torch, using a process normally applied to structural steels featuringthe same level of tensile strength. No preheating is required whenflame cutting is performed at ambient temperatures > 0° C.

4.4. WELDING

HISTAR steels offer a good weldability for ma-nual and automatic processes, provided the ge-neral rules for welding are respected. ShieldedMetal Arc Welding (SMAW), Gas Metal Arc Welding(GMAW), Flux-Cored Arc Welding (FCAW), and Submer-ged Arc Welding (SAW) are processes successfully used toweld HISTAR 355 and 460 grades.

Flame cut groove surfaces have to be descaled by grindingbefore welding.HISTAR 355 and 460 and conventional structural gradescan be combined by welding. For these cases the weldingconditions of the conventional grade have to be integratedin the welding procedure.

4.4.1. PREHEAT TEMPERATURES

The preheat temperature for avoiding cold cracking representsthe lowest temperature before starting the first runand below which the weld region shall not fall during welding.

Thanks to the low carbon equivalent values of the HISTAR grades (see figure 8), it is generally not necessary to preheat, aslong as: • the energy supply ranges between 10 and 60 KJ/cm, • the temperature of the product is > 0° C, • electrodes with low hydrogen content and low carbon

equivalent are used.

8

4. FABRICATION GUIDELINES

> 4.1. GENERAL

> 4.2. MACHINING

> 4.3. FLAME CUTTING

> 4.4. WELDING

> 4.4.1. PREHEAT TEMPERATURES

> 4.4.2. WELDING CONSUMABLES

> 4.5. STRESS RELIEVING

> 4.6. FLAME STRAIGHTENING

> 4.7. HOT FORMING

> 4.8. COLD FORMING

> 4.9. GALVANIZING

> 4.10. BEAM FINISHING

CE [%] Thickness [mm]

HISTARARH

Conv

entio

nal s

te

ion

nve

steel

grades

es

gr

Yield strenght Re [MPa]

0,7

0,6

0,5

0,4

0,3

0,2

235 275 355 420 460

12

125

12

40

80

125

500

ste

veveve

al

rrradd

AA

Preheating temperature [°C]

200

150

100

50

0

Figure 8: Preheating temperatures for conventional structuraland HISTAR grades (acc. to EN 1011-2:2001/method A)

No preheat conditions for HISTAR grades : • For Re < 460 : H2 ≤ 10 ml /100g• For Re ≥ 460 : H2 ≤ 5 ml /100g• E > 10kJ/cm

CEV(%)=Mn (Cr+Mo+V) (Cu+Ni)

6 5 15+C + +

Messezentrum, BremenArchitect : G. Schulze

Recommendations for the preheating temperature of finegrain steels are given in EN 1011-2:2001 in function of the carbon equivalent, the thickness of the pro-duct, the hydrogen content of welding consuma-bles and the heat input. These recommendations applyto normal fabrication restraint conditions and welding ofparent metal at temperatures > 0° C.

From these recommendations and specific trials on HISTAR355 and HISTAR 460 grades, the following preheating temperatures have been deduced:

HISTAR 355: no preheating required over the entire thickness range with:• diffusible hydrogen content of deposited metal

≤ 10 ml/100g• heat input values ≥ 10 KJ/cmHISTAR 460: no preheating required over the entire thickness range with:• Diffusible hydrogen content of deposited metal

≤ 5 ml/100g• heat input values ≥10 KJ/cm

HISTAR 460 may also be welded with consumables containing hydrogen levels between 5 and 10 ml/100g.In this case, a slight preheating is advised whencombined with thick sections at a low range ofheat input.

Table 2 indicates the preheating requirements applicablefor the HISTAR 460 grade in function of the thickness, heatinput and hydrogen content of the weld consumables.

Some preheating may be required for ambienttemperatures < 0° C, electrodes with high hydrogencontent, high restraint conditions or low heat input welds(such as repair welds, tack welds or single pass welds onthick material). In case of special applications, the fabrica-tor may apply a more conservative preheating procedure.In any case, preheating is not detrimental to the quality ofthe HISTAR grades.

Drying of the groove area is recommended before carry-ing out welding at temperatures ≤ + 5° C or if the surface ofthe beam is wet.

4.

9

Table 2: Preheating requirements for HISTAR 460

Hydrogen content of consumables [ml/100 g]

5-10Heat input [KJ/cm]

≤ 5Heat input [KJ/cm]

Thickness

[mm]

≤ 40 > 40

15-60

No preheatNo preheat

10-15

No preheatNo preheat

15-60

No preheatNo preheat

10-15

No preheat100°C

4.

4.4.2. WELDING CONSUMABLES

The filler metal has to be selected in order to en-sure the intended mechanical properties of theweld joint.The consumable should be chosen according to the followingcriteria:• the mechanical properties of the weld metal shall

comply with the requirements of the HISTAR grade, in particular the impact energy,

• matching or slight “overmatching” of the tensile properties in comparison with the base metal is common welding practice,

• in order to use the “no preheat” procedure, the diffusible hydrogen content in the deposited weld metal must below, i.e. H2 ≤ 10ml/100g for HISTAR 355 and H2 ≤ 5ml/100g for HISTAR 460,

• basic covered electrodes and fluxes are to be dried before use for 2 hours at 300° C and stored at 150° C in a drying oven and/or a quiver. When using dry elec-trodes, only the storage at 150° C is required. The recom-mendations of the manufacturer shall be followed,

• as for the welding of conventional structural steels, electrodes containing nickel are recommended in case of high toughness requirements at low temperature (e.g. bridges, offshore).

Table 3 summarises the information allowing asuitable choice of the welding consumables: ten-sile and impact properties of the HISTAR grades as well asthe standards for the classification of the welding consum-ables for the various welding processes. Typical examplesfor choosing the welding consumables are included in thetable. Other choices may also be adequate. Advice on com-mercial designations is available upon request and may beprovided by the welding consumable producers.

The hydrogen content of the weld consumables is indicatedin the standard designation as H5 or H10 respectively forcontents lower than 5 or 10 ml/100g. No hydrogen is present in the weld consumables for the flux free weldingprocesses (GMAW, MAG).

10

Belgacom Towers, BrusselsArchitect : CRV.SA

Table 3: Choice of the welding consumables metals following the European classification

Welding process (EN ISO 4063:2000)

Process

111

Standard

(Designation)

EN 499

(E 42 3 *** H10)

EN 499

(E 42 5 *** H5)

EN 499

(E 46 4 *** H5)

EN 499

(E 46 5 *** H5)

Tensile test Notch impact testGrade

HISTAR

355

355 L

355 TZK- OS

460

460 L

460 TZK- OS

Re min

[MPa]

355

355

355

460

460

460

Rm[MPa]

470 - 610

470 - 610

460-620

550 - 720

550 - 720

550 - 730

A5d min

[%]

22

22

22

17

17

17

Temperature

[°C]

-20

-50

-40

-20

-50

-40

Energy min.

[J]

40

27

50

40

27

60

Process

13, 135

Standard

(Designation)

EN 440

(G 42 3 ***)

EN 440

(G 42 5 ***)

EN 440

(G 46 3 ***)

EN 440

(G 46 5 ***)

Process

136

Standard

(Designation)

EN 758

(T 42 3 *** H10)

EN 758

(T 42 5 *** H5)

EN 758

(T 46 3 *** H5)

EN 758

(T 46 5 *** H5)

Process

121

Standard

(Designation)

EN 760

EN 756

EN 760

EN 756

EN 760

EN 756

EN 760

EN 756

Vélodrôme, BerlinArchitect : Dominique Perrault

4.5. STRESS RELIEVING

A stress relief post weld heat treatment (PWHT) may be necessary when the layout of the structure and/or the expected stress condition after welding requires a reductionof the residual stresses.

Stress relieving of HISTAR steel grades is performed at temperatures between 530° C and 580° C. The holding time should be 2 minutes per mm of product thickness, butnot less than 30 minutes and not more than 90 minutes.

4.6. FLAME STRAIGHTENING

Flame straightening is defined as a fast and local heating inorder to eliminate deformations or to give to a structuralmember a required shape. HISTAR 355/460 grades canbe flame straightened following the procedures usually applied to fine grain steels. The flame straightening tempe-rature may go up to 700° C in case of a local short heatingover the entire product thickness. For local superficial heating of the surface only, the flame straightening tempe-rature may go up to 900° C.

In order to improve the efficiency of the flame straighteningprocess, restrain forces should be applied to the structuralelement through calibrated jacks or other suitable devices.In the areas to be flame straightened, the stresses from therestraining forces shall be less than the yield stress of thesteel at elevated temperature.

4.7. HOT FORMING

The operations of hot forming and normalizing at temperatureshigher than those of the stress relieving treatment are notsuited for the HISTAR steels.

4.8. COLD FORMING

The cold forming behaviour of the HISTAR steels is comparableto the one of conventional structural steels of the same range of tensile strength. The usual cold deformation rulesapply. In particular, it is recommended to control and limitthe degree of cold deformation. Cold forming modifies the mechanical properties of steel; they should remain compatible with the intended use of the structure.

4.9. GALVANISING

Upon agreement, HISTAR grades are delivered with a silicon content ranging between 0.15 % and 0.25 % andare as such capable of forming a zinc layer during hot dip galvanising. Fabrication recommendations for steel elements to be galvanized must be followed. More detailedinformation on this topic are given in the Arcelor brochure“Corrosion protection of rolled steel sections using hot dipgalvanisation” (available upon request).

4.10. BEAM FINISHING

To save time and costs to the customer, the structu-ral shapes from Arcelor can be delivered with processinglike cold sawing, drilling, coping, straightening, cambering,weld-edge bevelling, welding, and surface coating.

11

4.

5.1. ROLLING TOLERANCES

Tolerances on dimensions and weight of beams in HISTAR grades and in structural steels are identical. They are given inthe sales catalogue for sections of Arcelor.

5.2. MECHANICAL TESTING

For the structural HISTAR grades, tensile test and Charpy V-notch impact test are performed in accordance with EN 10113:1993. Supplementary tests are possible onagreement at an extra.

The frequency of mechanical testing for the HISTAR Offsho-re grades is in accordance with EN 10225:2001, i.e. once per 40 t or part thereof. The following tests are performed:one tensile test and one set of three Charpy V-Notch impacttests. Position and orientation of samples for these tests are in accordance with EN 10225:2001. Supplementarytests such as through thickness tensile tests according to EN 10164:1993 and impact tests in transverse direction can be performed on agreement at an extra.

If other tests, such as weldability evaluation tests, are requested, this has to be agreed upon.

5.3. ULTRASONIC TESTING

Ultrasonic testing is carried out on agreement at an extra. The procedure for this test must be agreed between the purchaser and the manufacturer.

In case of order following EN 10164:1993, ultrasonic testingis performed in accordance with EN 10306:2001 class 2.3.

5.4. CERTIFICATION

The type of certification shall be specified at the time of order.

5.5. SURFACE CONDITIONING

HISTAR beams are delivered in standard ex-mill condition withsurface quality in accordance with EN 10163-3:1991, ClassC, Subclass 1. Other conditions are possible on agreement.

Material can be supplied shot-blasted with or without coatingon agreement at an extra. Procedures have to be agreed uponbetween the purchaser and the manufacturer. Shot-blasted ma-terial with or without coating can be supplied with surfacecondition in accordance with EN 10163-3:1991, Class D,on agreement at an extra.

12

5. TECHNICAL DELIVERY CONDITIONS

> 5.1. ROLLING TOLERANCES

> 5.2. MECHANICAL TESTING

> 5.3. ULTRASONIC TESTING

> 5.4. CERTIFICATION

> 5.5. SURFACE CONDITIONING

6. GENERAL DELIVERY CONDITIONS

If not specified otherwise, general delivery conditions are in accordance with EN 10021:1993.

7. QUALITY ASSURANCE

The Arcelor long product mills are certified EN ISO 9001:2000.

13

6.GENERAL DELIVERY CONDITIONS

7.QUALITY ASSURANCE

Messezentrum, BremenArchitect : G. Schulze

Sony Center, BerlinArchitect : Murphy/Jahn Ink

8. HISTAR STEELS PROTECT THE ENVIRONMENT

ARCELOR Sections’s concept of sustainable development involves all the decision-making players in the group’s environmental policy, which ensures that as much attentionis paid to environmental concerns as to safety issues. The Long Products mills of Arcelor have implemented the Environmental Management System in accordance with theEN ISO 14001:1996 standard.

During the last decade of the 20th century, the production sites for the long products of Arcelor were converted fromthe integrated steel production route, using the limited resources of local iron ore, to the state-of-the-art electric arc furnace (EAF) route based on recycled ferrous scrap as sole raw material. This new technology considerably enhances productivity and reduces all types of emissions as well as primary energy consumption.

Consequently, the HISTAR steels are made from recycledscrap and are indefinitely recyclable. The QST in-line heattreatment operates without external supply of energy and substantially limits the use of alloying elements in the steel. Infact, the QST process allows to further up-cycle steel scrap asthe constructional performance of a beam in HISTAR steel is by far superior to the performance of a standard beam (seeFigures 2-7). HISTAR grades enable the building industry to:

• Reduce its overall steel consumption,• Reduce the impact of transportation of materials due to

lower weight,• Design slender load carrying elements occupying less

space in a building,• Design bold and outstanding structures.

14

Com

merz

bank

, Fr

ank

furt -

Arc

hite

ct : F

ost

ers

& P

artne

rs, Lo

ndon

16

9. TECHNICAL ADVISORY FOR OUR CUSTOMERS

ARCELOR Sections Commercial is the world leader for hot rolled structural shapes. These sections form the foun-dation stone for cost-effective, ecological, and aesthetic so-lutions for the optimisation of building designs.

ARCELOR Sections Commercial provides its customers with consultancy services covering all types of products and projects free of charge.

Our team of civil engineers is at your disposal to answer all your questions concerning the use of our sections. This technical advice extends to the design of building components, construction details, surface and fireprotection, metallurgy and welding. Our specialists canvisit any site in the world, on request.

In order to guarantee the best possible incorporation of profiles, special software and various items of technical literature are also available to our customers. These can be ordered from ARCELOR Sections Commercial, or can be found on the Internet at www.sections.arcelor.com.

Although every care has been taken in producing this brochure, please note that ARCELOR Sections Commercial cannot accept any liability in respect of any errors contained herein nor any damage that may result from a misinterpretation of its content.

17

9.

Filmstudio, Köln-OssendorfArchitect : Mronz & Kottmaier

Table 4: Chemical composition of HISTAR steel grades for general applications

Grades

HISTAR 355

HISTAR 355 L

HISTAR 460

HISTAR 460 L

C

max.

0,12

0,12

0,12

0,12

Mn

max.

1,6

1,6

1,7

1,7

Si (3)

max.

0,30

0,30

0,30

0,30

P

max.

0,035

0,030

0,035

0,030

S

max.

0,030

0,025

0,030

0,025

Al (2)

min.

0,02

0,02

0,02

0,02

Nb

max.

0,05

0,05

0,05

0,05

V

max.

0,10

0,10

0,12

0,12

≤ 63

0,39

0,39

0,41

0,41

CEV (1) max.

Chemical composition

Ladle analysis [%]

nominal thickness [mm]> 63 ≤ 125

0,39

-

0,43

-

(1) CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15

(2) If sufficient nitrogen binding elements are present, the minimum aluminium requirement does not apply.

(3) On agreement Si : 0.15 - 0.25 %

Table 5: Mechanical properties of HISTAR steel grades for general applications

Grades

HISTAR 355

HISTAR 355 L

HISTAR 460

HISTAR 460 L

≤ 125

355

355

460

460

Mechanical properties

Tensile test Charpy V-notch impact test

Nominal Thickness [mm]

(1) Mean value of three specimens. No single value is less than 70 % of the guaranteed average value. The provisions according to EN 10113:1993 are applicable

Min. yield strength Re [MPa] Temperature

[°C]

0

-20

-20

-50

0

-20

-20

-50

Min. average

abs. energy (1)

[J]

47

40

4727

47

40

47

27

Tensile

strength Rm

[MPa]

470 - 630

470 - 630

540 - 720

540 - 720

Minimum

elongation A

Lo=5.65√So

[%]

22

22

17

17

9.

18

Table 6: Chemical composition of HISTAR steel grades for offshore applications

Grades

HISTAR 355 TZ OFFSHORE

HISTAR 355 TZK OFFSHORE

HISTAR 460 TZ OFFSHORE

HISTAR 460 TZKOFFSHORE

C

max.

0,12

0,12

0,12

0,12

Mn

max.

1,6

1,6

1,7

1,7

Si (3)

max.

0,30

0,30

0,30

0,30

P

max.

0,025

0,020

0,025

0,020

S

max.

0,010

0,007

0,010

0,007

Al (2)

min.

0,02

0,02

0,02

0,02

Nb

max.

0,04

0,04

0,05

0,05

V

max.

0,06

0,06

0,06

0,06

0,38

0,38

0,39

0,39

CEV (1)

max.

Chemical composition

Ladle analysis [%]

(1) CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15

(2) When other N-binding elements are used, the minimum Al value does not apply.

(3) On agreement Si : 0.15 - 0.25 %

Table 7: Mechanical properties of HISTAR steel grades for offshore applications

Grades

HISTAR 355 TZ OFFSHORE

HISTAR 355 TZK OFFSHORE(4)

HISTAR 460 TZ OFFSHORE

HISTAR 460 TZKOFFSHORE(4)

Longitudinal

direction

-20° CKV ≥ 50 J

-40° CKV ≥ 50 J

-20° CKV ≥ 60 J

-40° CKV ≥ 60 J

Mechanical properties

Tensile test Through thickness tensile test (1) Charpy V-notch impact test (2)

> 16

≤ 40

355

355

460

460

Tensile

strength

Rm

[MPa]

460 - 620

460 - 620

530 - 720

530 - 720

Minimum

elongation A

Lo=5.65√So

[%]

22

22

17

17

Min. reduction

of area Zz

[%]

25

35

25

35

Min. yield strength

Re

[MPa]

nominal thickness

(1) Through thickness testing upon agreement. Mean value of 3 tests. Only for t >15mm

(2) Mean value of three tests for full size specimens with no single value less than 70 % of the guaranteed average value. The provisions according to EN 10225: 2001 are applicable.

(3) Tested on agreement.

(4) For thickness ≤ 25 mm, Charpy V test at -20°C

≤ 16

355

355

460

460

Transverse

direction(3)

-20° CKV ≥ 27 J

-40° CKV ≥ 50 J

-20° CKV ≥ 27 J

-40° CKV ≥ 50 J

Edition: 2005-1

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