这是二份不同的标准，ASTM A269是通用的，ASTM A312冷加工用的。用途不一样。 ASTM A269 Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service 通用奥氏体不锈钢无缝管和焊接管 ASTM A312 Standard Specification for Seamless,Welded,and Heavily Cold Worked Austenitic Stainless Steel Pipes 冷加工奥氏体不锈钢焊接管和无缝管
