1. Heat exchanger tube 2. ASTM A213, A210-C, A179, A192, DIN17175 ST37.5 ST35.8 3. OD: 6-1200mm, WT: 1-80mm 4) Use for heater 1 Product name heat exchanger tube2 Production StandardASTM SA213, SA335, A369, A209, A250, G3462, G3467, DIN17175, BS3059-23 Material A213: T2, T5, T9, T11, T12, T22, T91, T92 A335: P1, P2, P5, P9, P11, P12, P21, P22, P91, P92 DIN17175: 15Mo3, 13CrMo44, 10CrMo910, ...