兑水 发表于 2009-9-10 08:12:15

ASTM A 921-1993 后热锻用微合金,高质量,热锻钢棒的标准规范

A921/A921M-93(1999) Standard Specification for Steel Bars, Microalloy, Hot-Wrought, Special Quality, for Subsequent Hot Forging
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