🟧 Product Overview
Duplex stainless steels combine austenitic + ferritic microstructures, offering:
- Very high mechanical strength
- Excellent resistance to pitting and crevice corrosion
- Outstanding resistance to stress‑corrosion cracking (SCC)
- Superior performance in chloride‑rich environments
- Lower nickel content than austenitic grades (cost‑effective)
Super Duplex grades (like 2507) further enhance corrosion resistance and strength.
2205 — Standard Duplex Stainless Steel
- Balanced duplex structure
- Twice the strength of 304/316
- Excellent resistance to chloride corrosion
- Widely used in chemical processing and marine environments
2507 — Super Duplex Stainless Steel
- Higher Cr, Mo, and N content
- Exceptional pitting and crevice corrosion resistance
- Extremely high mechanical strength
- Ideal for offshore, subsea, and desalination systems
🟧 Available Grades
2205 Duplex, 2507 Super Duplex
🟧 Standards
- ASTM A240 / A480
- EN 10088‑2
- JIS G4304 / G4305
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 2205 (%) | 2507 (%) |
|---|
| C | ≤0.03 | ≤0.03 |
| Cr | 22.0–23.0 | 24.0–26.0 |
| Ni | 4.5–6.5 | 6.0–8.0 |
| Mo | 3.0–3.5 | 3.0–5.0 |
| N | 0.14–0.20 | 0.24–0.32 |
| Fe | Balance | Balance |
Note: 2507’s higher Cr, Mo, and N content is the key factor behind its superior pitting resistance and mechanical strength.
🟧 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| 2205 | ≥450 MPa | ≥620 MPa | ≥25% |
| 2507 | ≥550 MPa | ≥800 MPa | ≥25% |
🟧 Product Specifications
Thickness
Width
Surface Finishes
🟧 Applications
2205 — Duplex Applications
- Chemical processing equipment
- Marine structures
- Heat exchangers
- Oil & gas pipelines
- Pressure vessels
2507 — Super Duplex Applications
- Offshore platforms
- Subsea pipelines
- Desalination plants
- High‑chloride industrial systems
- Heat exchangers in aggressive environments
🟧 Why Choose WelSteels
- Full Duplex & Super Duplex stainless steel coil supply
- High‑strength, corrosion‑resistant materials
- Suitable for extreme environments
- SGS / BV inspection available
- Export‑grade seaworthy packaging
