兑水 发表于 2009-9-9 10:41:42

ASTM A 847-2005 具有增强耐大气腐蚀性能的冷成型焊接与无缝....

A847-99a(2003) Standard Specification for Cold-Formed Welded and Seamless High Strength, Low Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance
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