1.alloy steel tubes and pipes standard GB,DIN ,ASTM ASME ,JIS 2.8 ... alloy steel tubes and pipes applies to petroleum,chemical industry ,electric power,boiler with its metits of high temperature resistant ,low temperature resistant ... P2,P5,P11,P12 P22 Useful:High-Temperature Service Seamless ferritic alloy-steel pipe for high-temperature serviceChemical properties (%)MaterialCSiMnPSMoCr %%%%max%maxA 335 ...