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ASME SA335 P9 HFW Tube with Helical Studs OD 10 to 508mm for Reformer Convection Section Base Tube Grade: SATM A106 Gr. A, Gr. B , Gr. C , 20#, P11, P22, P5, P9, P91 Standard: ASTM A213, ASTM A312, ...