General Description
904L is an austenitic stainless steel with low carbon for use under severe corrosive conditions. It contains 25% nickel and 4.5% molybdenum which provide good resistance to chloride stress corrosion cracking. 904L has superior corrosion resistance in comparison with 316L and 317L. Due to addition of Cu, this alloy has excellent corrosion resistance agianst reducing acids such as sulfuric acid and phosphoric acid.
Common applications are production and transport of sulfuric acid, metal pickling in sulfuric acid, paper and allied industries, Chemical and pharmaceutical industries.
Chemical Composition
| Grade | Fe% | Ni% | Cr% | Mo% | Cu% | C% | Mn% | Si% | S% | P% |
|---|---|---|---|---|---|---|---|---|---|---|
| 904L | Bal. | 23.0-28.0 | 19.0-23.0 | 4.0-5.0 | 1.0-2.0 | Max 0.02 | Max 2.0 | Max 1.0 | Max 0.035 | Max 0.045 |
Designations
UNS N08904
Werkstoff Nr. 1.4539
Specifications
904L Bar: ASTM A479
904L Forging: ASTM A484
904L Sheet/Plate: ASTM A240
904L Pipe/Tube: ASTM A312
Physical Properties
Density：8.0 g/cm3
Mechanical Properties
Solution Annealed
Tensile: Min 490 MPa
Yield: Min 215 MPa
Elongation: Min 35%