lybro 发表于 2009-7-13 10:01:11

ASTM A 49-2001

ASTM A 49-2001
Standard Specification for Heat-Treated Carbon Steel Joint Bars, Microalloyed Joint Bars, and Forged Carbon Steel Compromise Joint Bars
热处理碳素钢连接棒材，微合金连接棒材和法兰连接棒材的标准规范
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