... on the weight Surface: Mirror or Satin or Hairli NameStainless Steel PipeStandardASTM A554, A312, A249, A269 and A270Material Grade304,316,201 ... : +/- 0.02mmc) Length: +/- 5mmSurface180G, 320G, 400G Satin / Hairline(Matt Finish, Brush, Dull Finish)400G, 500G, 600G or 800G Mirror finishApplicationOrnamental tubes ... %≥30%≥35%≥35%Hardness (HV)<253<253<200<200 stainless steel pipe