What is the difference between 2205 and 2507?
Jan 19, 2026
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When it comes to duplex steel, many people refer to the 2507 and 2205 types. These two steels have many applications, such as the chemical industry, oil, and gas, marine engineering, etc. Although the two sheets of steel are similar, there are obvious differences in their chemical composition, physical properties, corrosion resistance, and applicable scenarios. This article will explore the characteristics of duplex 2507 vs 2205, analyze the differences between them, and how to choose the appropriate steel for practical applications.
What is the difference between 2205 and 2507?
What is a SS 2205 equivalent material?
SS 2205 (Duplex 2205) equivalent material shares its properties, primarily identified by its UNS number S31803 or S32205, European designation 1.4462, and ASTM grades like A182 F51, A240, A790, and A789, offering high strength and corrosion resistance, making materials like UNS S32205, DIN 1.4462, and ASTM A182 F51 direct equivalents.
what is Super Duplex 2507 Equivalent?
Super Duplex 2507 (a high-strength, corrosion-resistant alloy) has several equivalents, most notably UNS S32750 (North America) and EN 1.4410 (European), often known by trade names like SAF 2507, with casting equivalents including ASTM A890 Grade 5A (CE3Mn). These designations refer to the same super duplex stainless steel, characterized by its high chromium, molybdenum, and nitrogen content for superior performance in harsh environments.
What is the difference between 2205 and 2507?
Duplex 2205 is a standard duplex stainless steel, while Super Duplex 2507 is a higher-performance grade, differing mainly in alloying elements (more Cr, Mo, N in 2507) leading to significantly higher strength (yield strength ~800 MPa vs ~550 MPa) and superior resistance to pitting and crevice corrosion.
Duplex 2205 vs 2507 ：Equivalent materials
| Country / Standard | Duplex 2205 | Duplex 2507 | Notes |
|---|---|---|---|
| USA / ASTM | UNS S32205 / S31803 | UNS S32750 | Corresponding ASTM A240 / A789 / A182 standards |
| Europe / EN | EN 1.4462 | EN 1.4410 | Common European standard numbers |
| Germany / DIN | X2CrNiMoN22-5-3 | X2CrNiMoN25-7-4 | DIN standard designations |
| UK / BS | BS 32205 | BS 32750 | British standard equivalents |
| Japan / JIS | SUS329J4L | SUS32750 | Japanese Industrial Standard numbers |
| China / GB | 00Cr22Ni5Mo3N | 00Cr25Ni7Mo4N | GB/T 1220 / GB/T 14976 |
Chemical Composition Comparison: 2205 vs 2507
| Duplex Steel Grade | C | Si | Mn | Cr | Ni | S | P | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| Duplex 2205 (S32205) | 0.030 | 1.00 | 2.00 | 21.0-23.0 | 4.5-6.5 | 0.020 | 0.030 | 2.5-3.5 | 014-0.20 |
| Super Duplex 2507 (S32750) | 0.030 | 0.80 | 1.20 | 24.0-26.0 | 6.0-8.0 | 0.020 | 0.035 | 3.0-5.0 | 0.24-0.32 |
Mechanical Performance
| Property | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Yield Strength (Rp0.2) | ≥ 450 MPa | ≥ 550 MPa |
| Tensile Strength (Rm) | ≥ 620 MPa | ≥ 800 MPa |
| Elongation | ≥ 25% | ≥ 25% |
|
Hardness (HB) |
≤ 290 | ≤ 310 |
Corrosion Resistance: 2205 vs 2507
| Property | Duplex 2205 | Super Duplex 2507 |
| PREN (Pitting Resistance) | ~34–36 | ~40–45 |
| Chloride Environment Performance | Strong | Exceptiona |
| Best For | Moderate chloride & industrial use | Severe offshore & marine conditions |
Duplex 2205 performs exceptionally well in environments with moderate chloride exposure and is widely used in chemical process piping, marine equipment, and industrial heat exchangers. Super Duplex 2507, with its higher PREN, excels in deep-sea, desalination, and high stress applications where corrosion threats are extreme.
Mechanical Strength & Fabrication
Both alloys exhibit significantly higher strength compared to traditional austenitic grades like 316L. Duplex 2205's strong yield and tensile strength make it suitable for many structural and pressure-bearing applications, while Super Duplex 2507's increased strength allows for thinner section designs and improved service life where durability is paramount.
2205 vs 2507 Super stainless steel :Cost
In terms of cost, 2507 super duplex stainless steel is typically 30–50% more expensive than 2205, but its higher strength and corrosion resistance can reduce total lifecycle costs by enabling thinner wall designs and longer service life in high-chloride environments.
2507 Duplex Stainless Steel Supplier
2507 duplex stainless steel is a super duplex stainless steel composed of ferrite and austenite. Gnee offers a variety of product forms: plates, pipes, bars, wires, coils, profiles, etc. Products include seamless and welded pipes. Gnee offers a wide range of products, supports customization, has its own factory, provides one-stop service, and offers free samples. Contact us for a free quote!
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