Normalising of Clad Plate

The vessel head can be normalized after forming, and that process will not damage cladding. PWHT will not compensate for normalizing, and it (PWHT) will not damage the clad.

Per ASME code, cladding processes and specifications are covered at:

• ASME SA-263 specification for stainless chromium steel-clad plate

• ASME SA-264 specification for stainless chromium-nickel steel-clad plate

• ASME SA265 specification for nickel and nickel-base alloy-clad steel plate

• The attached Article 5 is extracted from ASME SA-263 indicates that stress relieving of the composite plate by heating subcritically is permitted (see the limitation when you do tempering).

.................

Would it be possible for you to state reasons for any of these heat treatments? I mean what caused you to think along the lines. Why not go for proper preheating prior to cladding? Then again while dealing with SS, you can never ignore sensitization. Particularly when cooling it down from HT temp to the range of 300-400 deg C or so. Maybe I am grossly ignorant......

Thanks to both of you for responding. The requirement comes from the client's requirements. Usually when forming heads after a certain fibre elongation a heat treatment is required. Besides when cold forming heads there's a need for restoration of plate properties. I posted my query with the very fear of sensitization. I request more replies please.