High Quality ASTM A335 P91 Seamless alloy steel pipe 1.Surface:bright and black painting 2.Material:P5, P11, P91, P22, T91, ASTM A335 P91 Seamless alloy steel pipe1. Alloy steel pipe OD10-1170mmWT2-135mmStandardGB/T5310-2008, ASTM A335, ASTM A387GradeCr-Mo alloy/ Mn-V alloySection shapeRoundApplicationmachinery, structure pipe, chemical and petroleum and so onMaterial12Cr1MoV, 15CrMo, Cr5Mo, P91, ...