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发表于 2012-4-20 12:37:37
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本帖最后由 wangqinghua196 于 2012-4-20 16:25 编辑
Designation: A 961 – 04
《Standard Specification for Common Requirements for Steel Flanges, Forged Fittings, Valves, and Parts for Piping Applications 1》
7. Heat Treatment
7.1.4Normalizing —Material shall be uniformly reheated to a temperature above the transformation range, and subsequently, cooled in air at room temperature.
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