1. astm a209 T1 seamless alloy steel pipe 2. ASTM A213, A210-C, A179, A192, DIN17175 ST37.5 ST35.8 ... Material A213: T2, T5, T9, T11, T12, T22, T91, T92 A335: P1, P2, P5, P9, P11, P12, P21, P22, P91, P92 ... Test,Hardness Test,Hydrostatic TestMore information according the standard: A179 Seamless Low Carbon Heat-Exchanger Tube and Condenser Tubes astm a209 T1 seamless alloy steel pipe