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OD 10-760mm WT 2-68mm Standard GB/T5310-2008, ASTM A335, ASTM A387 Grade 12Cr1MoV, 15CrMo, Cr5Mo, P91, T91, P2, P5, P11, P12, 35CrMo, 42CrMo, 40CrMnMo, Cr9Mo, Cr2Mo, 20CrMn, 40CrMn, 38CrMoAL 40Cr, ...