[国外标准] ASTM A512-96(2005) Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
[国外标准] ASTM A512-96(2001) Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
[国外标准] ASTM A512-2006
[国外标准] ASTM A512-1996(2001)
[国外标准] ASTM A512-06