Is EN 1.4539 the Same as 904L Stainless Steel?
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What material is EN 1.4539 equivalent to?
EN 1.4539 is a super austenitic stainless steel also known as 904L (UNS N08904). It is equivalent to the ASTM standard material grade UNS N08904 and the AISI standard grade AISI 904L.
What is 904L stainless steel equivalent to?
904L (UNS N08904) stainless steel is a super austenitic stainless steel, mainly composed of 19-23% chromium, 23-28% nickel, 4-5% molybdenum, and 1-2% copper. It meets ASTM A240 and EN 10088-2 standards and is equivalent to 1.4539 (EN) and SUS 904L (JIS).
What is the difference between 1.4539 and 904L?
1.4539 and 904L are essentially the same super-austenitic stainless steel, as 1.4539 is the European Standard (EN) designation, while 904L is the common designation, also known as UNS N08904. They share the same high-alloy composition, with high nickel and molybdenum contents and a small addition of copper, which gives them excellent resistance in sulfuric acid, phosphoric acid, and chloride-containing environments.
The slight differences in chemical composition and mechanical properties between 1.4539 and 904L are generally negligible, and the two materials are often considered interchangeable.
Chemical Composition Comparison
Note: 1.4539 and 904L are essentially the same grade; differences are mainly in naming standards (EN vs ASTM).
| Element | 1.4539 (EN 1.4539 / UNS N08904) | 904L (ASTM / UNS N08904) |
|---|---|---|
| C | ≤ 0.02% | ≤ 0.02% |
| Cr | 19 – 23% | 19 – 23% |
| Ni | 23 – 28% | 23 – 28% |
| Mo | 4 – 5% | 4 – 5% |
| Cu | 1 – 2% | 1 – 2% |
| Mn | ≤ 2% | ≤ 2% |
| Si | ≤ 1% | ≤ 1% |
| P | ≤ 0.035% | ≤ 0.035% |
| S | ≤ 0.02% | ≤ 0.02% |
| N | ≤ 0.1% | ≤ 0.1% |
Mechanical Properties
| Property | 1.4539 (EN) | 904L (ASTM) |
|---|---|---|
| Tensile Strength | 490 – 710 MPa | 490 – 710 MPa |
| Yield Strength | ≥ 220 MPa | ≥ 220 MPa |
| Elongation | ≥ 35% | ≥ 35% |
| Hardness | ≤ 90 HRB | ≤ 90 HRB |
| Density | 8.03 g/cm³ | 8.03 g/cm³ |
| Modulus of Elasticity | 200 GPa | 200 GPa |
Is EN 1.4539 stainless steel magnetic?
No, EN 1.4539 (also known as 904L) stainless steel is non-magnetic in its annealed condition, though it may become slightly magnetic if subjected to cold-working, such as bending or forming. As a high-alloy austenitic stainless steel, its austenite crystal structure makes it inherently non-magnetic, which is also a property that contributes to its excellent corrosion resistance.
What is the difference between 1.4529 and 904L?
Material 1.4529, also known as Alloy 926, is an austenitic special steel with a higher corrosion resistance than conventional chrome-nickel steel. Alloy 926 represents an enhancement to Alloy 904L (1.4539) stainless steel, with a raised molybdenum content and additional nitrogen.
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