Section 7.1 requires that all materials be cooled to a maximum temperature of 1000 F prior to the start of heat treatment. Section 7.3.1 does allow certain austenitic stainless grades to skip this step and proceed directly to heat treatment provided the part temperatures is above the minimum solution anneal temperature. Work done with ferritic-austenic (duplex and super duplex) materials has shown that they too can be effectively solution annealed without first cooling to a temperature below 1000 F. In practice these grades are generally processed in accordance with section 7.3.1 anyway to prevent the formation of sigma and other deleterious phases which would be present if they were air cooled after forging. Testing done on numerous forgings processed in this manner has shown that they do in fact meet the mechanical and corrosion resistance requirements of A182 when processed in this way. Current specification requirements force produces to conduct a seperate, unnecessary, solution anneal of these materials. This ballot item seeks to eliminate that requirement. Supporting data obtained from grades F51 and F61 is attached. Only those portions of the specification affected are included in the ballot.
Keywordsaustenitic stainless steel; chromium alloy steel; chromium-molybdenum steel; ferritic/austenitic stainless steel; ferritic stainless steel; martensitic stainless steel; nickel alloy steel; notch toughness requirements; pipe fittings; piping applications; pressure containing parts; stainless steel fittings; stainless steel forgings; steel; steel flanges; steel forgings, alloy; steel valves; temperature service applications, elevated; temperature service applications, high; wrought material;