904L Stainless Steel Chemical Composition
904L Stainless Steel: Composition, Properties
904L stainless steel is a superaustenitic stainless steel grade, alloy 904L (UNS N08904) and contains high levels of chromium and nickel with additions of molybdenum and copper to provide superior corrosion resistance. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assures good to excellent corrosion resistance, and moderate to high corrosion resistance in a wide range of process environments, containing dilute sulfuric acid. It also offers good resistance to other inorganic acids such as hot phosphoric acid as well as most organic acids.
With high-level alloys of 25% nickel and 4.5% molybdenum, 904L stainless steel provides good chloride stress corrosion cracking resistance, pitting and general corrosion resistance superior to 316L and 317L molybdenum enhanced stainless steels, The copper addition provides resistance to hot phosphoric acid and dilute sulfuric acid. 904L stainless steel is non-magnetic and offers excellent formability, toughness, and weldability.
904L Stainless Steel Chemical Composition
The chemical composition of stainless steel 904L contains roughly 19 to 23% chromium, 23 to 28% nickel, 4 to 5% molybdenum, and 1.0-2.0% Cu, which gives the alloy greater corrosion resistance than 316L.
| Alloy 904L | |
| Ni | 23 – 28 |
| Mo | 4 – 5 |
| Cr | 19 – 23 |
| Cu | 1 – 2 |
| C | 0.02 max |
| Mn | 2.0 max |
| Si | 1.0 max |
| P | 0.045 max |
| S | 0.035 max |
SS 904L Material Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) | Brinell (HB) | ||||
| 904L | 490 | 220 | 36 | 70-90 typical | 150 |
904L Stainless Steel Physical Properties
| Grade | Density (Kg/M 3 ) |
Elastic Modulus (GPa) |
Mean Co-Eff Of Thermal Expansion (Μm/M/°C) 0-100°C |
Thermal Conductivity (W/M.K) At 20°C |
Specific Heat 0-100°C (J/Kg.K) |
Elec Resistivity (NΩ.M) |
| 904L | 7900 | 190 | 15 | 11.5 | 500 | 952 |
904L Stainless Steel Specification
| Standard | 904L |
| UNS | N08904 |
| Werkstoff Nr. | 1.4539 |
