Alloy 904L Plates Supplier, Stockist and Exporter
Table of Contents
Aurico Alloys LLP supplies Alloy 904L Plates (N08904, Werkstoff 1.4539) from ready stock at our warehouses in Mumbai and Kalamboli, Navi Mumbai.
Alloy 904L is the grade that copper makes: that addition buys sulphuric acid resistance no ordinary austenitic stainless has, at a fraction of what a nickel alloy costs.
Sizes and Specifications
| Grade | Alloy 904L |
|---|---|
| UNS number | N08904 |
| Werkstoff (W.Nr.) | 1.4539 |
| Specifications | ASTM B625 (plate, sheet and strip), A240, ASME SB-625 |
| Size range | Thickness 4.75 mm to 150 mm, width to 2500 mm, length to 6000 mm, hot rolled and solution annealed. |
| Condition and finish | Hot rolled annealed and pickled, No.1 finish, or ground and polished to order. |
| Certification | EN 10204 3.1 mill test certificate; 3.2 and third-party inspection on request |
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.
Chemical Composition
A high-alloy austenitic grade carrying 19-23% chromium, 23-28% nickel, 4.0-5.0% molybdenum and - the distinguishing addition - 1.0-2.0% copper, with carbon held to 0.020% maximum.
| 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 and Physical Properties
Minimum tensile strength 490 MPa with 220 MPa yield and 35% elongation. The copper addition is what gives it resistance to dilute sulphuric acid across a wide concentration range, and the low carbon keeps welds free of sensitisation without stabilisation.
Industry Applications
| Industry | Typical use |
|---|---|
| Chemical processing | Sulphuric and phosphoric acid plant, pickling lines, and mixed acid vessels. |
| Pollution control | Flue-gas desulphurisation absorbers, ducting and scrubber internals. |
| Pharmaceutical | Reactor vessels and process equipment in aggressive acid duty. |
| Pulp and paper | Bleach plant equipment and chloride-bearing liquor systems. |
| Oil and gas | Produced-water handling and refinery overhead systems. |
Testing and Certification
Every consignment ships with an EN 10204 3.1 mill test certificate stating heat number, chemical analysis and mechanical properties. Depending on the specification we can add positive material identification, ultrasonic and dye-penetrant testing, intergranular corrosion testing to ASTM A262 or G28, ferrite measurement, and third-party inspection release from Lloyd's Register, Bureau Veritas, SGS or TUV.
Aurico Alloys LLP operates an ISO 9001:2015 quality management system, and can certify material to NACE MR0175 / ISO 15156 for sour service where the grade permits.
Frequently Asked Questions
Request a Quotation
Send your size, quantity and specification for a quote, usually the same working day. Call +91 7977 88 6611 or email info@auricoalloys.com.