Standard: Specification forseamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes Size:OD0.5-550mm WT0.05-80mm Steel Grade (Low alloy steel):T2, T5, T5b, T5c, T9, T11, T12, T17, T21, T22, T23, T24, T36, T91, T92, T122, T911 Steel Grade (Austenitic and ferritic stainless steel):TP201, TP202, XM-19, TP304, TP304L, TP304H, TP304N, TP304LN, TP309S, TP309H, TP309LMoN, TP309Cb, TP309HCb, TP310S, TP310H, TP310MoCbN, TP310Cb, TP310HCb, TP310HCbN, TP310MoLN, TP316, TP316L, TP316H, TP316Ti, TP316N, TP316LN, TP317, TP317L, TP317LM, TP317LMN, TP321, TP321H, TP347, TP347W, TP347H, TP347HFG, TP347LN, TP348, TP348H, XM-15, TP444