Simulated PWHT for ASME Material, Allow Steel or Carbon Steel

What is "simulated PWHT"?

PWHT (post weld heat treatment) is typically applied to fairly thick fabricated items, where the fabrication includes welding. I haven't heard of it being applied to raw materials before fabrication, although such materials may have been tempered or normalized. But these heat treatments would not be PWHT.

I am not closely familiar with all these processes; I am only suggesting a few ideas because no other replies have yet been made.

BTW, that should be "alloy" rather than "allow."

Conventional welding processes, which rely upon the local melting and fusion of material, generate significant residual stress distributions in the weldment. The extent of these stresses can, under conditions of high restraint, approach the yield strength of either the parent or weld materials itself.

Post-weld heat treatment (PWHT) is applied to welded steel assemblies, with its primarily objective to reduce the possibility of brittle fracture. The benefits of post-weld heat treatment include a significant reduction of tensile residual stresses in the weld joint and, to a lesser extent, tempering of the heat-affected zone and the weld metal microstructures.

Post-weld heat treatment of C-Mn steels is typically carried out at approximately 600°C(+), for one hour per 25mm of thickness (Approx.).

Many steel manufacturers arrange simulated post-weld heat treatment of its products with partial fabrication, with fully documented heat treatment charts traceable to national standards.

These material supplied which may be subject to post weld heat treatment in production later on has already been certified in the required condition. This fact is related to some of the steel manufacturer only, who carry out partial fabrication and then simulated PWHT of the parts.I hope this will help.