2205 vs 2507 Duplex Stainless Steel: What are the differences?
What is 2507 stainless steel?
2507 stainless steel is a super duplex stainless steel known for its high strength and exceptional resistance to corrosion. Its composition of approximately 25% chromium, 7% nickel, and 4% molybdenum makes it resistant to pitting, crevice corrosion, and stress corrosion cracking in harsh environments, such as those with high chloride content. Common applications include chemical processing, desalination plants, and offshore oil and gas equipment.
What is the equivalent material of 2205 stainless steel?
The most direct equivalents to 2205 stainless steel are its designations under other standards, such as UNS S31803 (or S32205), DIN 1.4462, and ASTM A182 Grade F51. These materials share the same properties, and the correct equivalent depends on the specific standard being referenced for a given application.
2205 vs 2507 Duplex Stainless Steel:Chemical Composition
| Element | 2205 (UNS S32205 / 1.4462) | 2507 (UNS S32750 / 1.4410) |
|---|---|---|
| Carbon (C) | ≤0.03% | ≤0.03% |
| Chromium (Cr) | 21–23% | 24–26% |
| Nickel (Ni) | 4.5–6.5% | 6.0–8.0% |
| Molybdenum (Mo) | 2.5–3.5% | 3.5–4.5% |
| Nitrogen (N) | 0.08–0.20% | 0.24–0.32% |
| Iron (Fe) | Balance | Balance |
2205 vs 2507 Duplex Stainless Steel:Mechanical Properties
| Property | 2205 | 2507 |
|---|---|---|
| Tensile Strength | 620–850 MPa | 750–1000 MPa |
| Yield Strength | 450–620 MPa | 550–750 MPa |
| Elongation | ≥25% | ≥20% |
| Hardness (HB) | 240–280 | 280–320 |
2205 vs 2507 Duplex Stainless Steel:Corrosion Resistance Comparison
2507 exhibits superior corrosion resistance to chloride-containing environments compared to 2205, especially at higher chloride concentrations. 2507 also has a higher critical pitting temperature (CPT), meaning it remains resistant to pitting corrosion at higher temperatures.Both grades resist corrosion, but 2507 excels in extremely aggressive chloride environments, such as seawater, chemical tanks, and offshore oil platforms.
| Environment | 2205 | 2507 |
|---|---|---|
| Pitting Resistance (PREN) | ~35–38 | ~45–48 |
| Crevice Corrosion | Excellent | Superior |
| Stress Corrosion Cracking | Very Good | Excellent |
| Chloride-Rich Environments | Moderate to High | High |
| General Atmospheric Corrosion | Excellent | Excellent |
2205 vs 2507 Duplex Stainless Steel:Fabrication and Welding
2205 stainless steel Easier to weld than 2507; dual-phase structure requires controlled cooling to avoid brittle phases. Can be welded with standard duplex filler metals; may need post-weld heat treatment in critical applications.
2507 stainless steel Welding is more demanding due to higher alloy content; requires special duplex filler metals and careful pre/post-weld procedures. Ideal for critical, high-corrosion applications.
2205 vs 2507 Duplex Stainless Steel Price per ton (2025 estimates):
2205 duplex plate: ~$5,800–$6,500 USD
2507 duplex plate: ~$7,500–$8,500 USD
Factors affecting price: Alloy content, thickness, surface finish, certification, market demand for Ni, Cr, and Mo.
2507 stainless steel vs 316
316 is a more common and less expensive austenitic stainless steel, suitable for general applications, especially in milder environments. 2507 has higher strength, allowing for the manufacture of thinner and lighter parts, but it is more difficult to process and has a lower maximum operating temperature than 316.
If you have project needs for 2205 and 2507 stainless steel, please feel free to place an order. GNEE has a large inventory of popular products for your selection. They can be processed into various practical product forms, including plates, coils, pipes, bars, and wires. For detailed chemical compositions and free samples, please contact our factory immediately. We offer competitive prices and excellent service.Email: info@gneestainless.com
