904L / X1NiCrMoCu25-20-5
1.4539Super-austenitic stainless steel with high Mo and Cu content. Excellent resistance to sulfuric acid, phosphoric acid, and chloride environments. Bridges the gap between standard austenitics (316L) and nickel alloys (Inconel/Hastelloy). Used in chemical processing, oil & gas, and pharmaceutical.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | UNS N08904 | N08904 | REF |
| 🇪🇺 | EN | Europe | X1NiCrMoCu25-20-5 | 1.4539 | 100% |
| 🇯🇵 | JIS | Japan | SUS890L | — | 93% |
Sources: ASTM B625, EN 10088-2, JIS G4305
Chemical composition comparison (wt%)
Side-by-side: 904L / X1NiCrMoCu25-20-5 (EN) (EN 10088-2) vs SUS890L (JIS)
| Element | 904L / X1NiCrMoCu25-20-5 (EN) | SUS890L (JIS) | Overlap |
|---|---|---|---|
| C | 0–0.02% | — | — |
| Si | 0–0.7% | — | — |
| Mn | 0–2% | — | — |
| P | 0–0.03% | — | — |
| S | 0–0.01% | — | — |
| Cr | 19–21% | — | — |
| Mo | 4–5% | — | — |
| Ni | 24–26% | — | — |
| Cu | 1.2–2% | — | — |
| N | 0–0.15% | — | — |
Mechanical properties
Solution Treated
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 490–690 | MPa |
| Yield Strength | ≥ 220 | MPa |
| Elongation | ≥ 35 | % |
| Hardness HB | ≤ 220 | HB |
| Elastic Modulus | ≥ 190 | GPa |
| Density | ≥ 8.05 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1100–1150 °C | water | Rapid cooling required | Ensure rapid quench to avoid Mo-rich phase precipitation |
Compatibility verdict
904L / X1NiCrMoCu25-20-5 and SUS890L: 93% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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