304/304L is a variation of the basic 18-8 grade, Type 302, with a higher chromium and lower carbon content. Lower carbon minimizes chromium carbide precipitation due to welding and its susceptibility to intergranular corrosion. It is the most versatile and widely used of all the stainless steels.

UNS: S30400/S30403
Stock Sizes: 1/8” – 8” OD


  • Seamless Tube: ASTM A213/A269
  • Welded Tube: ASTM A249/A269
  • Seamless Mechanical Tube: ASTM A511
  • Welded Mechanical Tube: ASTM A554
  • Welded & Seamless Pipe: ASTM A312
  • NACE MR0175/MR0103

Available Processing:

  • Cold Worked and Bright Annealed
  • Cold Worked, Annealed, and Pickled
  • Cold Worked
  • Hot Finished

Common Testing: Eddy Current, Flare, Flattening, Positive Material Identification

Chemical Composition (%)

Iron (Fe)Balance
Chromium (Cr)18-20%
Nickel (Ni)8-12%
Nickel (Ni) - A554/A5118-11%
Molybdenum (Mo)
Manganese (Mn)2% Max
Silicon (Si)1% Max
Carbon (C)0.035% Max
Sulfur (S)0.030% Max
Phosphorus (P)0.045% Max

Physical Properties

Density (lb/in3)0.285
Elongation (min %)35
Minimum Yield (psi)30,000
Minimum Tensile (psi)75,000
Max Hardness (HRB)90