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PWHT of AUSTENITIC STEEL

PWHT of AUSTENITIC STEEL

PWHT of AUSTENITIC STEEL

(OP)
hello

In ASME code for Austenitic stainless steel ( 18Cr-8Ni) no PWHT requirement is given,
it says "PWHT is neither permitted nor prohibited", but my service requires PWHT so how should we perfrom the PWHT and what are the factots should I consider while ordering the materials..

Thanks.

RE: PWHT of AUSTENITIC STEEL

Ask an engineer experienced in the fabrication of pressure vessels. You are contradicting yourself, what service is against the design code?

RE: PWHT of AUSTENITIC STEEL

Assuming that the Engineer/Owner required PWHT for service, either one will need to provide the appropriate PWHT parameters.

RE: PWHT of AUSTENITIC STEEL

Khati,

Please see Non-Mandatory Appendix A of ASME Section II Part D, especially A-300.
 

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN

RE: PWHT of AUSTENITIC STEEL

PWHT is not required for this material. IF a post weld treatment is required, this would be a solution anneal treatment to ensure maximum corrosion resistance in service. This can be a problem for an object that has been manufactured.

RE: PWHT of AUSTENITIC STEEL

ordering materials has nothing to do with the term non
mandatory.
you go ahead and use/make,/design or write your PWHT acordign to the materials used,  procedure, PWHT the item and you are done your job.
 

RE: PWHT of AUSTENITIC STEEL

And if you use the 'normal' PWHT temperature of 1100 - 1250°F, you have ruined your material.  The alloying elements come out of solution on 304/316, etc austenitic stainless steels.  As metengr said, the only appropriate Heat Treatment is a full Solution Annealing.  "If it isn't broke, don't try to fix it".

Just because an unsophisticated customer asks for PWHT of stainless steel, does not mean that it is appropriate.

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