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ASTM WK91152
In harmony with other product forms of Grade 91 Type 2, such as A213, A335 and A336, a new supplement S64 for Minimum Cooling Rate will be added in response to EPRI guidelines and ASME Code Case 2864-3. The rapid cooling is required to maintain the proper tempered martensite microstructure with fine dispersion of precipitates necessary for meeting the tensile properties and long-term creep strength.
Date Initiated: 06-12-2024
Technical Contact: Deborah Fialkowski
Item: 001
Ballot: A01 (24-04)
Status: Negative Votes Need Resolution