GB2270-80,GB/T14975,GB/T14976,GB/T13296,GB5310,GB9948,ASTM A213,ASTM A269,ASTM A312 and JIS G3463.The materials:304,304L,316,316L,317, 317L, 321H,310S,347,347H and KY704, etc.Specifications: O.D.:6mm~530 mm; Wallthickness:0.8mm ~ 30mm.The Stainless Steel Welded Pipes Standards: ASTM A268/A268M, ASTM A269, ASTM A789/A789M and GB/T12771-2000.Thematerials:304,304L,316,316L,321 and 310S, etc.Specifications:O.D.:219mm~1000 mm; Wall thickness:2mm~20mm