... , sanitation & industry materials. NameASTM-A554 Stainless Steel Welded PIpes ItemsSquare tubes, round tubes, oval pipes, special shaped pipes,empaistic pipes, fittingsStandardASTM A554, A249, A269 and A270Material Grade201 ... %, Cr 18%316L: Ni10%~14%Outer Diameter6mm-219mmThickness0.25mm-3mmLength6m or as customers' request Tolerancea) Outer Diameter: +/- 0.2mmb) Thickness: +/- 0 ...