Properties and ASME Code Approval of P92 and P122 Forgings

摘要

NF616 and HCM12A have been designated as T92/P92 and T122/P122 respectively for tubes and pipes in ASME/ASTM, and approved as Code Case 2179 for P92 and Code Case 2180 for P122 by ASME for use in Section I construction. Efforts to collect data for forgings of both steels have revealed that the forgings exhibit almost the same properties as tubes and pipes except for a slight difference in the creep strength of P92. Data packages for both steels (including time independent properties and creep properties) produced by the steel manufacturers, Nippon Steel and Sumitomo Metal, were submitted to the ASME Boiler and Pressure Vessel Code Committee to obtain approval for the inclusion of forgings into the above-mentioned Code Cases. This paper presents the material properties characterization of the as-received and fabricated forgings, as well as the circumstances and discussion at the committee to include forgings into the existing Code Cases 2179 and 2180.