PWHT Temperature for welding CS To SS

[sevak hiren]

Dear Experts,

Kindly suggest what should be the PWHT Temperature after welding of
following dissimilar materials.

SA 516 Gr.70 To SA 240 Gr.304

Regards

[Prakash Hegde]

Controlling factor for PWHT temp  is CS and not SS  and we have heat treat as per ASME code UCS 56 or any applicable code

 

Regards

 

Hegde Prakash

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[SANTOSH K]

Dear Sevak,

As per ASME B 31.3,

331.2.3 Dissimilar Materials

(a) Heat treatment of welded joints between dissimilar

ferritic metals or between ferritic metals using dissimilar

ferritic filler metal shall be at the higher of the

temperature ranges in Table 331.1.1 for the materials in

the joint.

(b) Heat treatment of welded joints including both

ferritic and austenitic components and filler metals shall

be as required for the ferritic material or materials unless

otherwise specified in the engineering design.

Regards,

Santosh.

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[Ramin Kondori]

Dear Sevak:

If your SS plate is a low carbon grade (It should be), apply PWHT with
holding temperature range of (590 to 620).

If your SS plate is not L-grade, I recommend you to prepare at least 3
welded coupons from your 304 plate and apply a separate PWHT with
holding temperatures of 620, 650 and 700 degrees (each one have a
different holding temperature). Then prepare 2 metallographic test
specimens from each coupon and check for carbide precipitation (not
ordinary macro test, it should be x200 or x500 mignification). Any
specimen which has less carbides (of course within acceptable range)
will represent your desired PWHT of such joint.

Best Regards
Ramin Kondori
QC/Welding Engineer *
IWE AT 0070