Duplex · Stainless Steel
2205 Duplex Stainless Steel
Chemical composition and mechanical properties to ASTM A240; available sizes are standard ranges.
① Chemical composition (ASTM A240, %)
| Element | Range |
|---|---|
| C | ≤0.03 |
| Si | ≤1.00 |
| Mn | ≤2.00 |
| P | ≤0.030 |
| S | ≤0.020 |
| Cr | 22.0–23.0 |
| Ni | 4.5–6.5 |
| Mo | 3.0–3.5 |
| N | 0.14–0.20 |
② Mechanical properties (ASTM A240)
| Property | Requirement |
|---|---|
| Tensile strength Rm | ≥ 620 MPa |
| Yield strength Rp0.2 | ≥ 450 MPa |
| Elongation A | ≥ 25% |
| Hardness | ≤ 293 HBW |
③ Available sizes (standard range)
- Thickness: 1.0–60 mm
- Width: ≤ 2000 mm
- Form: coil / sheet / plate / circle / slit strip on request
- Surface: 2B · BA · No.1 · No.4 · HL · 8K on request
④ Applicable standards
ASTM A240 · EN 10088-2 · ASTM A923 (corrosion test)
⑤ Typical applications
Seawater piping, desulphurisation equipment, chemical tanks, pulp and paper, offshore platforms, heat exchangers
⑥ Substitution and selection advice
Yield strength more than twice that of 316L and far better chloride stress-corrosion resistance than the 300 series. However welding procedure requirements are stricter and continuous service above 300 °C is not recommended.
Chemical and mechanical data quoted from the public ASTM A240 standard. Available sizes are standard ranges; the contract and technical agreement prevail.