1.alloy steel pipe,alloy steel tube 2.Application:structure pipe 1.Alloy steel pipe,Alloy steel tube2.Standard: ASTM (ASME)3.Grades: T91, P91, P11, TP309S, TP310S, P2, T2, P12, T11, T12, P22, T22 ... specifications according to customers' requirements Foreign standards implemented: DIN, JIS, ASTM (ASME) Corrosion Resisting Alloy Steel Pipe