904L Stainless Steel
904L, UNS N08904 and EN 1.4539, is a low carbon, high nickel molybdenum austenitic stainless steel. It contains 19% to 23% chromium, 23% to 28% nickel, 4% to 5% molybdenum, and 1% to 2% copper. It resists sulfuric, acetic, and formic acid, as well as chloride pitting, crevice corrosion, and stress corrosion. The source lists stable performance in sulfuric acid up to 40℃, together with toughness, workability, and weldability for chemical processing, marine engineering, and environmental equipment.
Product details
Chemical composition
| 904L | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | N |
|---|---|---|---|---|---|---|---|---|---|---|
| min | – | – | – | – | – | 23.0 | 19.0 | 4.0 | 1.0 | – |
| max | 0.02 | 1.0 | 2.0 | 0.04 | 0.03 | 28.0 | 23.0 | 5.0 | 2.0 | 0.1 |
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Grade equivalents
| English Item | UNS | W.Nr. | JIS | GB/T | Other Grades |
|---|---|---|---|---|---|
| 904L | N08904 | 1.4539 | SUS890L | 015Cr21Ni26Mo5Cu2 | X1NiCrMoCu25-20-5 Z2NCDU25-20 |
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Physical properties
| Density g/cm³ | 8.0 |
|---|---|
| Melting range ℃ | 1360-1397 |
| Thermal conductivity (100℃) λ/(W/m•℃) | 25 |
| Specific heat J/kg•℃ | 500 |
| Elastic modulus GPa | 193 |
| Electrical resistivity μΩ•m | 0.97 |
| Linear expansion coefficient a/10-6℃-1 | 15.3 |
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Mechanical properties
| Tensile strength Rm N/mm | ≥490 |
|---|---|
| Yield strength RP0.2 N/mm | ≥215 |
| Elongation % | ≥35 |
| Hardness HB | ≤200 |
| *After solution heat treatment | |
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Applications
- Chemical processing: reactors, distillation columns, and acid-transfer piping for media such as sulfuric and phosphoric acid
- Petroleum and petrochemical processing: refinery equipment, reactors, and piping for sulfur-bearing media
- Environmental engineering: flue gas desulfurization absorbers and spray systems, plus wastewater treatment equipment
- Marine engineering: seawater heat exchangers and corrosion-resistant offshore-platform components
- Paper production: digesters, bleaching equipment, and piping for chloride-bearing media
- Pharmaceutical and food processing: high-purity reactors, centrifuges, and tanks for soy sauce or cooking wine
- Energy: thermal power-plant condensers and systems handling organic acids such as formic and acetic acid
Available product forms
- Round Bar
- Wire
- Forgings
- Plate
- Strip
- Seamless Pipe
- Welded Pipe
- Capillary Tube
- Flanges
- Pipe Fittings
- Non-standard Custom Parts
Values follow the Milike materials catalogue and are provided for preliminary review. Confirm the applicable purchase specification, heat treatment condition, and inspection requirements before final material selection.
- Heat and batch traceability
- PMI testing available
- Cut-to-size processing
- Material certificates on request
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