1.4539 stainless steel, also known as 904L, is a high-alloy austenitic stainless steel containing high levels of chromium, nickel, molybdenum, and copper, designed for excellent corrosion resistance in aggressive environments such as strong acids, seawater, and chloride-rich conditions.
| Standard | Equivalent Grade |
|---|---|
| ASTM | 904L / UNS N08904 |
| DIN | X1NiCrMoCu25-20-5 |
| ISO | 904L |
| JIS | SUS890L |
| AFNOR (France) | Z2NCDU25-20 |
| Element | Minimum (%) | Maximum (%) |
|---|---|---|
| C (Carbon) | — | 0.020 |
| Si (Silicon) | — | 1.00 |
| Mn (Manganese) | — | 2.00 |
| P (Phosphorus) | — | 0.045 |
| S (Sulfur) | — | 0.035 |
| Cr (Chromium) | 19.0 | 23.0 |
| Ni (Nickel) | 23.0 | 28.0 |
| Mo (Molybdenum) | 4.0 | 5.0 |
| Cu (Copper) | 1.0 | 2.0 |
| N (Nitrogen) | — | 0.10 |
| Fe (Iron) | Balance | — |
| Property | Value (Typical) | Test Standard |
|---|---|---|
| Tensile Strength (Rm) | 490–710 MPa | EN ISO 6892-1 |
| Yield Strength (Rp0.2) | ≥ 220 MPa | EN ISO 6892-1 |
| Elongation (A5) | ≥ 35% | EN ISO 6892-1 |
| Hardness (Brinell) | ≤ 220 HBW | EN ISO 6506-1 |
| Modulus of Elasticity | ~195 GPa | — |
| Density | ~8.0 g/cm³ | — |
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1300–1390°C |
| Thermal Conductivity (20°C) | 12.0 W/m·K |
| Electrical Resistivity | 0.95 μΩ·m |
| Specific Heat (20°C) | 500 J/kg·K |
| Coefficient of Thermal Expansion (20–100°C) | 15.0 ×10⁻⁶ /K |
| Process | Temperature Range | Notes |
|---|---|---|
| Solution Annealing | 1090 – 1175°C | Followed by rapid cooling (usually water quenching) |
| Stress Relieving | Not commonly used | Risk of reduced corrosion resistance |
| Hardening | Not hardenable by heat treatment | Only via cold working |
1.4539 stainless steel (904L) is your go-to material when standard stainless grades fail in aggressive environments. Its global equivalents like UNS N08904 or SUS890L prove its international recognition.
Looking for a reliable supplier of 1.4539 stainless steel with fast lead time, quality assurance, and technical support?
1.Certified Quality
All Gnee 1.4539 stainless steel products comply with EN 10088, ASTM A240, and PED/AD2000 requirements. Every batch is tested with PMI, intergranular corrosion tests, and ultrasonic inspection.
2.Wide Product Range
We supply 904L stainless steel plates, pipes, tubes, fittings, and bars in various dimensions. Surface finishes include 2B, No.1, No.4, and BA, suitable for marine and chemical environments.
3.Fast Delivery & Customization
With large inventories and flexible processing services (cutting, polishing, welding, and packaging), we can meet urgent delivery schedules and custom project requirements.
Contact Gnee today to get a competitive quote and professional guidance tailored to your project.
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