... , GB 4. Surface: white acid, annealed, black, bright, or as customers requirement NameStainless Steel tubeStandardASTM A554, A249, A269 and A270, A312 A304Material ... %~4.5%),301(Ni 5%)304 (Ni 8%, Cr 18%),316 (Ni 10%, Cr 18%),316L (Ni10%~14%),430Outer Diameter6mm--159mmThickness0.3mm ... , heat treatment, NDT 300 series TP 304 cold rolled Seamless Steel Pipe