What is 1.4539 material?
1.4539 material is a high-alloy, super austenitic stainless steel, commonly known as 904L (AISI 904L or UNS N08904), prized for its exceptional corrosion resistance, especially in aggressive media like sulfuric acid and seawater, thanks to its high Nickel, Chromium, Molybdenum, and Copper content, making it great for chemical plants, offshore, and paper industries where extreme durability is needed.
What material is 1.4539 equivalent to?
904L stainless steel is one of the best stainless steel grade for corrosion resistance. This grade is written as 1.4539 or X1NiCrMoCu25-20-5 according to EN norm and it is written as UNS S08904 according to UNS norm.
| EU EN |
USA - |
France AFNOR |
England BS |
Sweden SS |
Poland PN |
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| X1NiCrMoCu25-20-5 |
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Chemical composition % of steel X1NiCrMoCu25-20-5 (1.4539): EN 10088-2-2005
| Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast. |
| C | Si | Mn | Ni | P | S | Cr | Mo | N | Cu |
| max 0.02 | max 0.7 | max 2 | 24 - 26 | max 0.03 | max 0.01 | 19 - 21 | 4 - 5 | max 0.15 | 1.2 - 2 |
Mechanical properties (at room temperature in annealed condition)
| Product Form | ||||||||
|---|---|---|---|---|---|---|---|---|
| C | H | P | L | L | TW/TS | |||
| Thickness (mm) Max. | 8.0 | 13.5 | 75 | 160 | 2502) | 60 | ||
| Yield Strength | Rp0.2 N/mm2 | 2403) | 2203) | 2203) | 2304) | 2305) | 2306) | |
| Rp1.0 N/mm2 | 2703) | 2603) | 2603) | 2603) | 2603) | 2503) | ||
| Tensile Strength | Rm N/mm2 | 530 - 7303) | 530 - 7303) | 520 - 7203) | 530 - 7304) | 530 - 7305) | 520 - 7206) | |
| Elongation min. in % | Jmin (Longitudinal) | - | 100 | 100 | 100 | - | 120 | |
| Jmin (Transverse) | - | 60 | 60 | - | 60 | 90 | ||
Reference data on some physical properties
| Density at 20°C kg/m3 | 8.0 | |
|---|---|---|
| Thermal Conductivity W/m K at | 20°C | 12 |
| Modulus of Elasticity kN/mm2 at | 20°C | 195 |
| 200°C | 182 | |
| 400°C | 166 | |
| 500°C | 158 | |
| Specific Thermal Capacity at 20°C J/kg K | 450 | |
| Electrical Resistivity at 20°C Ω mm2/m | 1.0 | |
1.4539 Stainless Steel Corrosion Resistance
904L alloy and its alternatives offer excellent resistance to intergranular corrosion in both the as-delivered and sensitized conditions, as well as pitting and stress corrosion. Furthermore, the steel exhibits high resistance to crevice and pitting corrosion, as well as good weldability. In the TMT process, the supersaturation temperature is 1050-1150°C, and the forging and rolling temperatures are 900-1200°C.
1.4539 Stainless Steel Wear Resistance
After quenching and tempering, 1.4539 stainless steel achieves high hardness (~50–55 HRC), providing excellent wear and abrasion resistance, which makes it ideal for valve components, pump shafts, and mechanical wear parts subjected to repeated friction.
What are the differences between 1.4539 and 1.4404 stainless steel?
1.4539 (904L) is a higher-alloyed, super austenitic steel than 1.4404 (316L), offering significantly better corrosion resistance, especially in aggressive acids and chlorides, due to its higher Nickel, Chromium, Molybdenum, and added Copper content, while 1.4404 is a standard low-carbon grade good for general use but fails in harsher chemical environments where 1.4539 excels, making 1.4539 more expensive but superior in demanding applications.
If you have project requirements for 1.4539 and 1.4404 stainless steel bars, we welcome your order. GNEE has a large inventory of popular products for you to choose from. These materials can be processed into various practical product forms, including plates, coils, tubes, bars, and wires. For detailed chemical composition information and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
