... steel pipe Grade :AISI 304 (8% Ni 18% Cr) Type: Round /Square/Rectangular/Embossed/Threaded/Slop etc Grade 304 Stainless steel pipe Suface ... StandardASTM 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%~ ... 30%≥30%≥35%≥35%Hardness (HV)<253<253<200<200 Grade 304 Stainless steel pipe