Process: (Cold&Mandrel Forming). Sizes : (Seamless Type): 1/2" -20" (DN15-DN500). (Welded Type): 1/2” -48" (DN15-DN1200). Standards:GB/T12459, GB/T13401. SH3408, SH3409. ASME/ANSI B16.9, B 16.28, ASTM A403, MSS SP-43. DIN 2605, DIN2609, DIN2615, DIN2616. JIS B2311, JIS B2312, JIS B2313. Schedules: Sch5S-Sch80S; Sch10-Sch160; XS-XXS. Materials: TP304; TP3O4H; TP304L; TP316; TP316L. TP321; TP321H; TP317L; TP310S; TP347H.