1.alloy steel seamless tubes standard GB,DIN ,ASTM ASME ,JIS 2.8-1240 1- ... 3. material:all kinds of alloy 4.,massive stock alloy steel seamless tubes applies to petroleum,chemical industry ,electric power,boiler with ... ,P11,P12 P22 Useful:High-Temperature Service Seamless ferritic alloy-steel pipe for high-temperature serviceChemical properties (%)MaterialCSiMnPSMoCr %%%%max%maxA 335 Grade ...