Superior Corrosion Resistance
904l stainless steel sheet provides exceptional pitting and crevice corrosion resistance in acidic and chloride environments, offering up to 50% longer service life than standard grades while ensuring easy fabrication and welding.
Superior Corrosion Resistance
904l stainless steel sheet provides exceptional pitting and crevice corrosion resistance in acidic and chloride environments, offering up to 50% longer service life than standard grades while ensuring easy fabrication and welding.
| Material Grade | UNS N08904 / 1.4539 |
|---|---|
| Sheet Thickness | 0.3 mm to 6 mm |
| Width Range | Up to 1500 mm |
| Temperature Range | -196°C to 400°C |
| Yield Strength | Min 220 MPa |
| Tensile Strength | Min 490 MPa |
| Elongation | Min 35% |
| Chemical Composition (Key Elements) | Cr: 19-23%, Ni: 23-28%, Mo: 4-5%, Cu: 1-2%, C: ≤0.02% |
Alloy 904 (N08904) stainless steel is a high alloy austenitic product intended for use under severely corrosive conditions. It delivers reliable performance against multiple corrosion types, making it suitable for harsh industrial environments.
Grade 904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy variant incorporates copper to enhance resistance to strong reducing acids (such as sulphuric acid) while maintaining resistance to stress corrosion cracking and crevice corrosion. It is non-magnetic, offering excellent formability, toughness and weldability.
Notably, Grade 904L contains high amounts of expensive ingredients like molybdenum and nickel. Today, many applications previously using Grade 904L have been replaced by low-cost duplex stainless steel 2205.
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤0.020 |
| Chromium (Cr) | 19.0-23.0 |
| Nickel (Ni) | 23.0-28.0 |
| Molybdenum (Mo) | 4.0-5.0 |
| Copper (Cu) | 1.0-2.0 |
| Manganese (Mn) | ≤2.0 |
| Silicon (Si) | ≤1.0 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.035 |
| Nitrogen (N) | ≤0.10 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Tensile Strength, min (MPa) | 490 |
| Yield Strength, min (MPa) | 220 |
| Elongation, min (%) | 35 |
| Hardness, max (HRB) | 90 |
| Feature | 904L (UNS N08904) | 316L (UNS S31603) | 304L (UNS S30403) | 254 SMO (UNS S31254) |
|---|---|---|---|---|
| Material Type | Austenitic Stainless | Austenitic Stainless | Austenitic Stainless | Super-Austenitic Stainless |
| Temperature Range | Up to 400°C | Up to 870°C | Up to 870°C | Up to 450°C |
| Notch Toughness | Excellent (High Ni) | Good | Good | Superior (High Mo/N) |
| Corrosion Resistance | Excellent (PREN >35, Cu/Mo) | Good (PREN 24) | Fair (PREN 18) | Outstanding (PREN 42) |
| Applications | Desalination, Acid Processing, FGD | Marine, Food, General Chemical | General Piping, Architectural | Seawater, Pulp Bleaching |
| Tensile Strength (MPa) | 490 (min) | 485 (min) | 485 (min) | 650 (min) |
| Yield Strength (MPa) | 220 (min) | 170 (min) | 170 (min) | 300 (min) |
| Key Advantage | Reducing acid/SCC resistance | Cost-effective chloride resistance | Versatile general use | Ultra-high pitting resistance |
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