... (1)Standard: GB, ASTM, API (2)Standard: GB/T 3091-2001 (3)Grade:10#-45#, A53-A369 Standard: GB, DIN, ASTM, APIStandard: GB/T 3091 ... (Mainland)Secondary Or Not: Non-secondaryApplication: Structure PipeSpecificationsSize:1/2"-24" WallThickness:sch10,sch20,sch30,STD,sch40,sch60,schXS,sch80 ... ,sch140,sch160,XXS1) Matetial:J55, K55, N80, Q345, A106,A53(2)GB, ANSI , JIS, DIN ,ASME ,API 5L, API5CT,etc.(3) ...