CS C-1/2Mo11/4Cr-1/2Mo

21/4Cr-1Mo

5Cr-1/2Mo

9Cr-1Mo 12Cr

SS 304

SS 316

SS 321

SS 347

SS 309

SS 310 HK HT

INCOLOY800

A/B B/C B B B B B/K M/K M/K M/K M/E312 M/K M/L M M M1-A 1-A 2-B 2-B 2-C 3-C 3-C 1-N 1-N 1-N 1-N 1-N 1-N 1-N 1-N 1-N

C C C C C C/K M/K M/K M/K M/E312 M/K M/L M M M1-A 2-B 2-B 2-C 3-C 3-C 1-N 1-N 1-N 1-N 1-N 1-N 1-N 1-N 1-N

D D D D D/K* M/K M/K M/K M/E312 M/K M/L M M M2-C 2-C 2-C 3-C 3-C 2-N 2-N 2-N 2-N 2-N 2-N 2-N 2-N 2-N

E E E E/K* M/K M/K M/K M/E312 M/K M/L M M M2-C 2-C 3-C 3-C 2-N 2-N 2-N 2-N 2-N 2-N 2-N 2-N 2-N

F F F/K*2-C 3-C 3-C * * * * * * * * *

G G/K*3-C 3-C * * * * * * * * *

O/M3-C * * * * * * * * *

H H H H H K K/M K/M M1-D 1-D 1-D 1-D 1-D 1-D 1-D 1-D 1-D

I I I I K/L K/M K/M M1-D 1-D 1-D 1-D 1-D 1-D 1-D 1-D

J J J K/L K/M K/M M1-D 1-D 1-D 1-D 1-D 1-D 1-D

K K K/L K/M K/M M1-D 1-D 1-D 1-D 1-D 1-D

L L/M L/M M1-D 1-D 1-D 1-D

K/M M M1-D 1-D 1-D

M M1-D 1-D

M1-D

Note : 1. In the box Top line indicates welding consumables (Refer Appendix A)Bottom line left indicates preheat requirements (Refer Appendix B)Bottom line right indicates post weld heat requirements (Refer Appendix C)

2.

3.

*A E-6010 for Root and E-7018 for Cover passesB E7016 , E7018 , ER70S-2 Bare WireC E7016-A1 , E7018-A1 , ER80S-D2D E8016-B2 , E8018-B2 , ER80S-B2 , ER80S-B2L NOTES:E E9016-B3 , E9018-B3 , ER80S-B3 , E312 *F E8018 B6, ER 80 S B6 Bare Wire G E8018 B8, ER 80 S B8 Bare Wire +H E308-15 , E308-16 , ER308 Bare WireI E316-15 , E316-16 , ER316 Bare Wire

J E347-15 , E347-16 , Bare WireK E309-15 , E309-16 , Bare Wire ER309L E310-15 , E310-16 , Bare Wire ER310M ENiCrFe-3 (inconel 182) , ERNiCr-3 (inconel 82) Bare WireN E310-15 HG

+O E410-15 , E410-16 , ER410 Bare Wire

TABLE OF RECOMMENDED WELDING PRACTICES

( * ) PWHT may affect the corrosion resistance properties of the austenitic stainless steel weld metal under some conditions. Confirm with EIL/HMTD before use.

APPENDIX-A (WELDING CONSUMABLES)

For pipe or tube sizes upto 4"O.D. or 1/2"wall thickness maximum.

For special requirements of impact test and BHN, Chroloy No.414 is recommended.

21/4Cr-1Mo

11/4Cr-1/2Mo

SS309

SS321

SS316

( * ) These combinations may be joined by welding, Heat treatment may however, adversely affect the properties of one of the base matels. Contact EIL-HMTD for further information.

INCOLOY800

HT

HK

SS310

C-1/2Mo

CS

SS304

12Cr

9Cr-1Mo

5Cr-1/2Mo

Page 1 of 2

1.

2. 300F(149C) for 1 1/4 Cr - 1/2 Mo Steel ; 350F for 2 1/4 Cr - 1 Mo & 5 Cr - 1/2 Mo steels3. 400F(204C) for 9 Cr - 1 Mo and 12 Cr steels.

A) 1100F(593C) - 1200F(649C) See Note 1B) 1250F(676C) - 1350F(732C) See Note 1C) 1325F(718C) - 1350F(732C) See Note 1D) See Note 2N)

Note 1: PWHT not required for the followings conditions :a. Carbon Steel Tubing or Piping of less than 3/4" wall thicknessb.

c. Chrome - moly tubing or piping that meets all of the following requirements : i) A maximum specified chromium content of 3%ii) A maximum wall thickness of 1/2"iii) A minimum preheat of 350F(176C) {300F(149C) for Cr content not exceeding 2%}

d.

i) 1/2" for attachments to carbon steel and carbon molyii) 1/4" for attachments to Chrome - Moly pipe or Tubes.

e. Fillet welds used in slip-on and socket welding flanges and connections, as follows :i)

ii)

iii)

Note 2 :

The above table prepared based on the EIL standard specification of coils for fired heaters, specification 6-17-03 Rev.01

Carbon -moly steel and chrome-moly steel (upto 3% max.chrome content), regardless of the thickness, when the weld throat thickness does not exceed 1/2".The min. preheat temperature shall be as specified in Appendix B based on the pipe or tube wall thickness.

No post weld heat treatment normally required. However, when service conditions require post weld treatment, EIL-HMTD will provide specific instructions.

Carbon - moly tubing or piping upto 3/4" wall thickness and min.specified tensile strength not exceeding 71,000 psi.

Fillet welds attaching external non-pressure parts such as lugs or other pipe supporting elements to carbon steel, carbon-moly, 1 1/4Cr - 1/2Mo, 2 1/4Cr - 1Mo pipe or tube provided the throat thickness of the fillet weld does not exceed.

The minimum preheat temperature shall be as specified in Appendix B based on the pipe or tube wall thickness.

APPENDIX-B (PREHEAT REQUIREMENTS)50F(10C) for Carbon Steel with thickness less than 1" and minimum specified tensile strength not to exceeding 71000 psi.50F(10C) for Carbon-moly Steel upto 1/2" thickness and minimum specified tensile strength not to exceeding 71000 psi.50F(10C) for all thickness of alloys 304,316,321,347,309,310,HK and Incoloy800.

Carbon steel materials, regardless of thickness, when the weld throat thickness does not exceed 5/8".

APPENDIX-C (POST WELD HEAT TREATMENT REQUIREMENTS)

Not required where the ferritic member is within the limits shown in Note1. For situations outside these limits, EIL-HMTD will provide specific instructions.

175F(79C) for Carbon-moly Steel over 1/2" thickness or with minimum specified tensile strength exceeding 71000 psi.175F(79C) for Carbon Steel 1" and over or with minimum specified tensile strength exceeding 71000 psi.

Page 2 of 2

Sheet1