Process: Cold Drawing, Argon Arc Welding. Sizes: Seamless Type: 1/2" -24" (DN15-DN500). Welded Type: 6" -80" (DN150-DN2000). Standards: GB14976-2002, GB13296-2007, GB/T12771-2002; ASTM A-312, ASTM A-213, ASTM A-358. Schedules: Sch5S-Sch80S; Sch 10-Sch160; XS-XXS. Materials: TP304; TP304H; TP316; TP316L; TP321; TP321H; TP317L; TP310S; TP347H.