alloy seamless steel tubefor boiler teel grade: T91, T23, T22, T12, T11, T5, T2 Seamless Ferritic and Austenitic Alloy Steel Boiler(1)Steel Grade: T91, T23, T22, T12, T11, T5, T2, STBA 22/24/25, 10CrMo910, 13CrMo 44/12CrMo195, 3606, TUZ12C;(2)Standard: ASME SA213M, JIS G3462, DIN17175, BS 622/620/621/625, NF A49-213;(3)Specification : OD: 10mm-114.3mm (0.4055"-4.5"), WT: 2mm-22mm (0.0787"-0.8661 ...