... Type: Seamless Stainless Steel Pipe Material: 301, 304, 321, 316L, etc.Certificate: ISO, ASTM, GB, DIN, JIS, Etc ... pipeStandardAISI, ASTM, JIS, EN,etcMaterialTP304, TP304L, TP310 / S, TP316L, TP316 / 316L dual grade, TP317L,TP321, TP347 and so onOutside Diameter2mm~250mm ... 1-5) x (4000 - 13000)mmMaterial grade304, 304L, TP304, TP304L, 316L, TP316L, 321, F321, etc.StandardISO 9001/ ASTM A269/ A270/ A312 ...