兑水 发表于 2009-9-9 07:47:29

ASTM A 758-2000 具有改进的切口韧性的对缝焊锻制碳素钢管配件

A758/A758M-00 Standard Specification for Wrought-Carbon Steel Butt-Welding Piping Fittings with Improved Notch Toughness
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