Products
Min Temp
Max Temp
🌡
⚡
🛡
⚖
| Specification | Value |
|---|---|
| UNS Number | N08904 |
| DIN/Werkstoff Nr. | 1.4539 |
| Tensile Strength | 490-690 MPa |
| Yield Strength | ≥215 MPa |
| Density | 7.95 g/cm³ |
| Max Service Temp | 400°C |
| Element | Composition (%) |
|---|---|
| Ni | 23.0–28.0 |
| Cr | 19.0–23.0 |
| Mo | 4.0–5.0 |
| Cu | 1.0–2.0 |
| Mn | ≤2.0 |
| C | ≤0.02 |
| Fe | bal |
SS 904L Fasteners derive their exceptional performance from a carefully balanced composition of chromium, nickel, molybdenum and copper. The high nickel and molybdenum content significantly enhances resistance to chloride-induced pitting and crevice corrosion, while copper additions improve resistance to sulfuric acid environments. Low carbon content, capped at 0.020%, minimises the risk of sensitisation and intergranular corrosion during welding or thermal exposure, ensuring long-term structural integrity in demanding fastening applications.
These alloying characteristics translate into superior engineering benefits, including outstanding resistance to acidic, chloride-rich and marine environments where standard austenitic stainless fasteners would fail prematurely. SS 904L offers reliable mechanical performance, good ductility and weldability, alongside stable strength retention at moderately elevated temperatures. Its excellent corrosion resistance reduces maintenance costs and extends service life, making it highly suitable for fasteners used in chemical processing, offshore, marine and pollution-control industries requiring dependable, corrosion-resistant fastening solutions.
Specifications
SS 904L Fasteners are high-alloy austenitic stainless steel components defined by their mechanical properties, corrosion resistance, and precise dimensional specifications. Their technical data typically covers tensile performance, hardness, and size tolerances, making them suitable for demanding industrial assemblies where reliable fastening and compatibility are essential.
| Property | Value |
|---|---|
| Tensile Strength | 490-690 MPa |
| Yield Strength (0.2% Offset) | ≥215 MPa |
| Elongation | ≥35% |
| Hardness | ≤90 HRB |
| Modulus of Elasticity | 190-200 GPa |
| Thermal Expansion (20-100°C) | 15.7 µm/m°C |
| Thermal Conductivity | 11.5 W/m·K |
| Density | 7.95 g/cm³ |
| Melting Range | 1325-1400°C |
| Max Service Temperature | 400°C |
| Standard Type | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B16.5, MSS SP-75 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6-M64 / 1/4" - 2.1/2" |
| Length Range | 10mm-300mm (custom on request) |
| Available Forms | Bolts, Studs, Screws, Nuts, Washers |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1/3.2, ISO 9001 |
Applications
