304 Stainless Steel Pipe/Tube OD:8-630mm Thickness:0.5-10mm Grade:304.321.316.310 ... pipeStandardASTM A554, A249, A269 and A270, A312Material Grade201 ( Ni 0.8%),202 (Ni 3.5%~4.5%),301(Ni 5%)304 ... (Ni 8%, Cr 18%),316 (Ni 10%, Cr 18%),316L (Ni10%~14 ...