1.4529 vs 1.4539 Stainless Steel: Key Differences
Apr 21, 2026
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1.4529 vs 1.4539 Stainless Steel: Key Differences
What is 1.4529 material grade?
1.4529 (also known as Alloy 926 or 6Mo) is a high-alloy super austenitic stainless steel with excellent resistance to pitting corrosion, crevice corrosion, and chloride-induced stress corrosion cracking. Similar to 904L, but with higher molybdenum (6%-7%) and nitrogen content, it is suitable for highly corrosive environments such as chemical processing, offshore operations, and flue gas desulfurization.
What is 1.4539 material grade?
1.4539 (AISI 904L, UNS N08904) is a premium, low-carbon, high-alloy austenitic stainless steel designed for extreme corrosion resistance. It features high molybdenum and copper content, providing superior resistance to sulfuric acid, chlorides, pitting, and crevice corrosion compared to conventional steels like 316L. It is often used in chemical processing, pollution control, and marine environments.
What material is 1.4539 equivalent to?
| Grade | USA (UNS) | Germany (DIN/EN) | Common Name |
| 1.4539 | UNS N08904 | X1NiCrMoCu25-20-5 | AISI 904L |
| 1.4529 | UNS N08926 | X1NiCrMoCuN25-20-7 | Alloy 926 / Cronifer 1925 hMo |
1.4529 vs 1.4539 Stainless Steel: Chemical Composition (%)
The critical difference lies in the Molybdenum (Mo) and Nitrogen (N) levels.
| Element | EN 1.4539 (AISI 904L) | EN 1.4529 (Alloy 926) |
| Chromium (Cr) | 19.00 – 21.00 | 19.00 – 21.00 |
| Nickel (Ni) | 23.00 – 28.00 | 24.00 – 26.00 |
| Molybdenum (Mo) | 4.00 – 5.00 | 6.00 – 7.00 |
| Nitrogen (N) | ≤ 0.15 | 0.15 – 0.25 |
| Copper (Cu) | 1.20 – 2.00 | 0.50 – 1.50 |
| Carbon (C) | ≤ 0.020 | ≤ 0.020 |
| Iron (Fe) | Balance | Balance |
1.4529 vs 1.4539 Stainless Steel: Mechanical Properties (Solution Annealed)
1.4529 offers higher yield strength due to its Nitrogen alloying.
| Property | EN 1.4539 | EN 1.4529 |
| Yield Strength (Rp0.2) | ≥ 230 MPa | ≥ 300 MPa |
| Tensile Strength (Rm) | 520 – 720 MPa | 650 – 850 MPa |
| Elongation (A5) | ≥ 35% | ≥ 35% |
| Hardness (HBW) | ≤ 230 | ≤ 250 |
1.4529 vs 1.4539 Stainless Steel:Corrosion Resistance
1.4529 (Super Austenitic) offers superior corrosion resistance compared to 1.4539 (904L), particularly in chloride-rich environments like seawater or indoor swimming pools. While 1.4539 has excellent general corrosion resistance, 1.4529's higher molybdenum (6–7%) and nitrogen content provide superior resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
| Metric | EN 1.4539 (904L) | EN 1.4529 (6-Moly) |
| PREN Value | 34 – 40 | 43 – 48 |
| Pitting Resistance | Excellent in mild chlorides. | Superior; resistant to stagnant seawater. |
| Crevice Corrosion | Moderate risk in high-temp chlorides. | Highly Resistant even in acidic chloride media. |
What is the difference between 1.4529 and 1.4404 stainless steel?
Compared to 1.4404 (AISI 316L), 1.4529 (a super austenitic stainless steel) has superior corrosion resistance, especially in resisting pitting and crevice corrosion caused by chlorides. 1.4529 contains higher levels of nickel (25%), molybdenum (4.5%), and nitrogen, while 1.4404 is a standard, versatile stainless steel with good corrosion resistance.
1.4529 vs 1.4539 Stainless Steel: Applications
1.4529 (Alloy 926/6Mo) and 1.4539 (AISI 904L) are both high-performance austenitic stainless steels. 1.4529 is an "ultra-austenitic" upgrade of 1.4539. 1.4529 is suitable for harsh wet corrosive environments such as seawater and flue gas desulfurization, while 1.4539 is suitable for (but not limited to) general chemical processing applications.
Is 1.4529 more expensive than 904L?
Yes, 1.4529 (also known as Alloy 926 or N08926) is typically more expensive than 904L (1.4539). While both are high-performance super-austenitic stainless steels, 1.4529 is considered an enhanced version of 904L with significantly higher molybdenum (around 6.5% vs ~4.5% in 904L) and increased nitrogen, providing superior corrosion resistance that justifies its higher cost.
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