When an offshore processing plant witnessed persistent corrosion failures in their conventional stainless steel components exposed to hot sulfuric acid and seawater, they sought a superior material solution. The transition to 904L Sheets brought immediate results, dramatically improved corrosion resistance, reduced maintenance costs, and prolonged operational uptime. Now, Aurico Alloys LLP supplies these advanced sheets to procurement teams, engineers, fabricators, and OEM manufacturers across chemical, oil & gas, marine, pharmaceutical, and power sectors demanding reliability where it matters most.
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904L (UNS N08904, ASTM A240) is a high-alloy austenitic stainless steel with elevated levels of nickel, chromium, molybdenum, and copper. It offers exceptional resistance against highly corrosive environments, including oxidizing acids and chloride-bearing media often found in chemical processing, marine systems, and power generation plants. Notably, its low carbon content minimizes carbide precipitation, enhancing weldability and post-weld corrosion resistance, making it ideal for critical fabrications.
Aurico Alloys LLP provides certified 904L Sheets in various thicknesses and finishes, fully compliant with ASTM and UNS specifications. With mill test certificates, global traceability, and customized cutting capabilities, we support industries requiring dependable quality and timely deliveries.
Selecting Aurico’s 904L Sheets equips your operation with a durable material designed to outperform common stainless steels, offering safer plants, longer equipment life, and lower total lifecycle costs.
High-quality 904L Sheets ready for industrial use.
Specification Overview
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Grade | 904L Stainless Steel (UNS N08904) |
| Standards | ASTM A240, ASME SA240, EN 1.4539, DIN 1.4539 |
| Thickness Range | 0.5 mm – 50 mm |
| Width Range | up to 2000 mm |
| Length Range | up to 6000 mm |
| Finish | Hot rolled, cold rolled, annealed, pickled, polished |
| Forms Available | Sheet, plate, coil, strip, blanks, circles |
| Certification | Mill test certificates, RoHS, REACH compliant with full traceability |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | N08904 |
| Werkstoff / EN number | 1.4539 |
| EN designation | X1NiCrMoCu25-20-5 |
| Density | 8.00 g/cm3 |
| Melting range | 1383 °C |
| Specific heat (20°C) | 460 J/kg·K |
| Thermal conductivity (20°C) | 11.9 W/m·K |
| Coefficient of expansion (20–200°C) | 18.4 µm/m·K |
| Coefficient of expansion (20–400°C) | 18.0 µm/m·K |
| Coefficient of expansion (20–600°C) | 18.0 µm/m·K |
| Coefficient of expansion (20–800°C) | 18.2 µm/m·K |
| Coefficient of expansion (20–1000°C) | 18.5 µm/m·K |
| Electrical resistivity (20°C) | 0.935 Ω·mm²/m |
| Magnetic permeability (at 0.8 kA/m DC or AC at 20°C) | < 1.05 |
| Young's modulus (20°C) | 200 GPa |
| Oil and gas conformance | NACE MR0175 / ISO 15156-3 · NACE MR0103 / ISO 17945 (Aperam 904L Technical Data Sheet) |
| Plate, sheet and strip specification | ASTM B625 |
Identifiers and physical constants for 904L. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico Alloys LLP maintains an extensive stock of certified 904L Sheets in multiple sizes and finishes, offering rapid supply solutions for chemical, oil & gas, marine, pharmaceutical, and power generation applications worldwide. Custom fabrication and cutting options further support OEMs and fabricators’ specific production needs.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | — | 0.020 |
| Manganese (Mn) | — | 2.00 |
| Phosphorus (P) | — | 0.045 |
| Sulfur (S) | — | 0.035 |
| Silicon (Si) | — | 1.00 |
| Chromium (Cr) | 19.0 | 23.0 |
| Nickel (Ni) | 23.0 | 28.0 |
| Molybdenum (Mo) | 4.00 | 5.00 |
| Copper (Cu) | 1.00 | 2.00 |
| Nitrogen (N) | — | 0.10 |
Composition limits for 904L. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 515 – 690 |
| Yield Strength (0.2%, MPa) | 205 – 345 |
| Elongation (%) | 35 – 45 |
| Hardness (HB) | Max 217 |
| Max Service Temp (°C) | 500 Continuous |
Applications & Benefits
- Chemical Processing: sulfuric acid, phosphoric acid vessels, heat exchangers, evaporators, sulfur recovery units
- Oil & Gas: separators, scrubbers, piping for sour gas and chloride-laden fluids
- Marine: seawater systems, condensers, desalination plants requiring high corrosion resistance
- Pharmaceutical: sterile processing, clean utilities, manufacturing vessels
- Power: boiler water systems, cooling systems, flue gas desulfurization equipment
- OEM Fabrication: highly weldable, corrosion resistant sheets for custom pressure vessels and components
FAQ & Insights
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Aurico Alloys LLP’s 904L Sheets deliver industry-leading corrosion resistance, mechanical integrity, and certification for the world’s toughest chemical, marine, oil & gas, pharma, and power generation challenges. For assured quality, on-time delivery, and expert support, isn’t it time you specified Aurico’s Alloy 904L Sheets for your next critical project?