904L stainless steel, also known as UNS N08904 and W.Nr. 1.4539, is a high-alloy austenitic stainless steel with excellent corrosion resistance in aggressive environments. Its high levels of chromium, nickel, molybdenum, and copper make it highly resistant to sulfuric acid, chloride-induced pitting, and crevice corrosion.
904L is widely used in chemical processing, oil and gas, seawater systems, and pharmaceutical industries. It offers strong performance in acidic and chloride-rich environments, making it an ideal material for heat exchangers, piping, tanks, and components requiring durability and corrosion resistance.
| Element | % Present (in product form) |
| Carbon (C) | 0.02 |
| Silicon (Si) | 0.7 |
| Manganese (Mn) | 2 |
| Phosphorous (P) | 0.03 |
| Sulfur (S) | 0.01 |
| Chromium (Cr) | 19.00 – 21.00 |
| Nickel (Ni) | 24.00 – 26.00 |
| Nitrogen (N) | 0.15 |
| Molybdenum (Mo) | 4.00 – 5.00 |
| Copper (Cu) | 1.20 – 2.00 |
| Iron (Fe) | Balance |
| Specific Heat (0-100°C) | 450 | J.kg-1.°K-1 |
| Thermal Conductivity | 11.5 | W.m -1.°K-1 |
| Thermal Expansion | 15.8 | μm/μm/°C |
| Modulus Elasticity | 190 | GPa |
| Electrical Resistivity | 9.52 | Ohm-cm |
| Density | 7.95 | g/cm3 |
| Temper | Annealed | |
|---|---|---|
| Tensile Rm | 71 | ksi (min) |
| Tensile Rm | 490 | MPa (min) |
| R.p. 0.2% Yield | 32 | ksi (min) |
| R.p. 0.2% Yield | 220 | MPa (min) |
| Elongation (2” or 4D gl) | 35 | % (min) |
| Seamless / Welded Pipe | ASTM A312 TP 904L |
| Seamless / Welded Tubing | ASTM A269 TP 904L |
| Bar / Rod | ASTM A276 / A479 TP 904L |
| Forging | ASTM A182 F904L |
| Sheet / Plate | ASTM A240 UNS N08904 |
| Welding Consumable | AWS A5.9 ER385 |
Standard product forms of 904L/N08904/1.4539 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at [email protected] for full information.
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