904L tubing is a low carbon high alloy austenitic stainless steel, originally developed to resist corrosion in dilute sulfuric acid. Because of the combination of relatively high contents of chromium, nickel, molybdenum and copper, this grade has greatly improved resistance to strong reducing acids, particularly sulfuric acid. 904L tubing is also extremely resistant to chloride attack from both pitting/crevice corrosion and stress corrosion cracking. Alloy 904L tubing is non-magnetic in all conditions, possesses amazing toughness, and has good formability and weldability.

UNS: N08904
Stock Sizes: 1/8” – 1” OD


  • Seamless Tube: ASTM A213/A269/B677/A312
  • NACE MR0175/MR0103

Available Processing:

  • Cold Worked and Bright Annealed

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

Chemical Composition (%)

Iron (Fe)Balance
Chromium (Cr)19-23%
Nickel (Ni)23-28%
Molybdenum (Mo)4-5%
Manganese (Mn)2% Max
Silicon (Si)1% Max
Copper (Cu)1-2% Max
Carbon (C)0.020% Max
Sulfur (S)0.030% Max
Phosphorus (P)0.040% Max
Nitrogen (N)0.10% Max

Physical Properties

Density (lb/in3)0.285
Elongation (min %)35
Minimum Yield (psi)31,000
Minimum Tensile (psi)71,000
Max Hardness (HRB)90