... steel pipe 1.Surface:bright and black painting 2.Material:P5, P11, P91, P22, T91, 12Cr1MoVG ASTM A335 P91 Seamless alloy ... and petroleum and so onMaterial12Cr1MoV, 15CrMo, Cr5Mo, P91, T91, P2, P5, P11, P12, 35CrMo, 42CrMo, 40CrMnMo, Cr9Mo, Cr2Mo, 20CrMn, 40CrMn, 38CrMoAL40Cr ...