1.Main steel pipe 2.Material:Cr5Mo, 15CrMo 3.Standard:GB5310-95 ... )Secondary Or Not:Non-secondaryApplication:Gas PipeTechnique:Hot RolledCertification:CESurface Treatment:painted, oiledSpecial Pipe:Thick Wall PipeAlloy Or Not:Is ... P22, P11,P91 2.Standard: ASTMA213,A333,A335,JIS G3458Alloy Pipe ASTM A335 P91:1) Standard:ASTM A213, A333, A335 ... T91 (P91)13CrMo44, 42CrMo, 35CrMo, 10CrMo910 Alloy pipe