ASME has revised Code Case 2192-7, which is for use of A217 C12a and A426 CP91 castings in ASME Section I, Power Boilers, construction. The revision to the code case involves additional requirements for inspection, heat treatment, temperature measurement during heat treatment, recording of heat treatment parameters, hardness test results, recording of repairs, and reporting. Most of these new requirements were precipitated by a report from a utility company that had received a large C12a valve body casting with soft spots associated with a large and unreported weld repair to the casting. The ASME committees responsible for the code case revision have very few members whose companies have foundries, so the requirements reflect the perceived needs of the user community. Boiler manufacturers must use the code case to procure A217 C12a and A426 CP91 castings for their products, but manufacturers of piping, valves, and pumps use ASME B31 and B16 codes, which permit direct use the ASTM specifications. ASME thus desires that the changes be incorporated into the ASTM specifications, A217 and A426. This action revises A217 to incorporate the changes. Balloting will provide an opportunity for casting producers to provide useful feedback that may yet be influential in revising the code case. One option might be to create a new specification, based on A217, that is exclusively for C12a, rather than adding many requirements to A217 that are not applicable to the other grades in this specification. If that is the desire of A01.18, a request for permission to write a new specification must be made to A01. No changes to A426 are being proposed at this time, pending a discussion at the May, 2013, meeting to try to determine if anyone actually produces A426 CP91.
Keywordsalloy steel; high temperature; martensitic stainless steel; pressure containing; steel castings ;
Draft Under Development