High-alloy austenitic stainless steel with 23% chromium, 25% nickel, and 4.5% molybdenum for exceptional corrosion resistance.
Outstanding resistance to sulfuric, phosphoric, and acetic acids in a wide range of concentrations and temperatures.
Excellent resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC).
Good weldability and formability with high toughness even at cryogenic temperatures
904L stainless steel is a high-alloy austenitic stainless steel with excellent corrosion resistance, especially in strong acidic environments.
As a professional 904L stainless steel supplier, Hengyi Metal provides plates, sheets, pipes and bars for demanding industrial applications worldwide.
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Email: sales@hengyimetal.com
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Key Features
1. Excellent Corrosion Resistance
904L provides outstanding resistance to sulfuric acid, phosphoric acid and chloride environments.
2. High Alloy Content
The addition of nickel, molybdenum and copper improves resistance to pitting and crevice corrosion.
3. Good Weldability
Low carbon content ensures good weldability and reduces the risk of intergranular corrosion.
4. High Durability
Suitable for long-term use in aggressive industrial environments.
Product Details
904L (UNS N08904,W.N.r 1.4539) is a fully austenitic stainless steel designed for service in severe corrosive environments where standard austenitic grades such as 304 and 316 are inadequate . The addition of copper enhances resistance to reducing acids, while the high molybdenum and nickel content provides superior resistance to localized corrosion . This alloy is approved for pressure vessel applications under ASME Boiler and Pressure Vessel Code and is available with full material traceability and mill test certificates upon request . Typical applications include chemical processing equipment, sulfuric acid plants, phosphoric acid production, seawater cooling systems, pulp and paper bleach plants, and pharmaceutical reactors .
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.020 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.035 max |
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed)
| Property | Typical Value |
|---|---|
| Tensile Strength | 520 – 720 MPa (75 – 104 ksi) |
| Yield Strength (0.2% Offset) | 220 – 350 MPa (32 – 51 ksi) |
| Elongation | 35 – 45% |
| Hardness | < 90 HRB / < 200 HB |
| Impact Strength (Charpy V) | 100 – 200 J (room temperature) |
| Impact Strength (-196°C) | 80 – 150 J |
Available Forms & Specifications
| Product Form | Size Range | Typical Specifications |
|---|---|---|
| Bar & Rod | 3mm – 300mm diameter | ASTM A276, A479 |
| Plate & Sheet | 0.5mm – 100mm thickness | ASTM A240 |
| Strip & Foil | 0.1mm – 5mm thickness | ASTM A240 |
| Pipe & Tube (Seamless) | Custom sizes | ASTM A312, A213 |
| Pipe & Tube (Welded) | Custom sizes | ASTM A312 |
| Fittings | Custom configurations | ASTM A403 |
| Wire | 0.1mm – 12mm diameter | ASTM A276, A580 |
| Forgings | Custom configurations | ASTM A182 F44 |
Applications by Industry
| Industry | Applications |
|---|---|
| Chemical Processing | Sulfuric acid plants, phosphoric acid production, acetic acid reactors, heat exchangers, pressure vessels |
| Oil & Gas | Sour gas service, offshore platforms, piping systems, wellhead equipment |
| Marine & Offshore | Seawater cooling systems, marine hardware, propeller shafts, pumps |
| Pharmaceutical | Reactors, storage tanks, processing equipment, clean-in-place (CIP) systems |
| Pulp & Paper | Bleach plants, digesters, liquor heaters, chlorine dioxide equipment |
| Food & Beverage | Processing equipment, storage tanks, piping systems |
| Pollution Control | Flue gas desulfurization (FGD), scrubber systems |
| Power Generation | Condensers, heat exchangers, cooling water systems |
FAQ
Q: What is 904L stainless steel used for?
A: It is widely used in chemical, marine and acid processing industries.
Q: Is 904L better than 316L?
A: Yes, 904L offers better corrosion resistance, especially in acidic environments.
Q: Are you a 904L stainless steel supplier?
A: Yes, Hengyi Metal supplies high-quality 904L stainless steel worldwide.
Learn more about 904L stainless steel properties
Compare with other grades in our 316L vs 304 guide
