ASME SA-213和ASME SA-312管子用途完全不一样
ASME SA-213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler,Superheater,and Heat-Exchanger Tubes
锅炉、过热器和换热器用铁素体与奥氏体合金钢无缝管
ASME SA-312 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