2205 duplex stainless steel plate delivers roughly double the yield strength of 316L with better pitting resistance — letting you use thinner sections in demanding chloride service. ZEMSS supplies GB-standard 2205 plate from major Chinese mills with full mill documentation, plus cutting-to-size from our Taiyuan facility.
Product Specifications
| Parameter | Specification |
|---|---|
| Grade | 2205 duplex (GB 022Cr23Ni5Mo3N · UNS S32205) |
| Standards | GB/T 4237 · ASTM A240 equivalent · EN 10088-2 equivalent |
| Thickness | 3 – 60 mm typical range (confirm per size) |
| Width | 1,500 / 1,800 / 2,000 mm standard |
| Length | 3,000 / 6,000 mm standard · cut-to-size available |
| Surface | No.1 hot-rolled pickled (standard) · blasted on request |
| Certification | Mill test certificate, EN 10204 3.1 type, heat-number traceable, ferrite balance documented |
International Grade Equivalents
| Grade we quote | GB designation | UNS | ASTM | EN number | JIS |
|---|---|---|---|---|---|
| 2205 | 022Cr23Ni5Mo3N (old: 00Cr22Ni5Mo3N) | S32205 / S31803 | 2205 | 1.4462 | SUS329J3L |
Chemical Composition & Mechanical Properties
| Cr | Ni | Mo | N | C max |
|---|---|---|---|---|
| 22.0–23.0% | 4.5–6.5% | 3.0–3.5% | 0.14–0.20% | 0.030% |
| Yield strength ≥ | Tensile strength ≥ | Elongation ≥ | Note |
|---|---|---|---|
| 450 MPa | 620 MPa | 25% | ~2× the yield strength of 304/316L (annealed) |
The duplex microstructure (roughly 50/50 austenite-ferrite, documented on the mill certificate) is what gives 2205 its strength and stress-corrosion resistance — ask for the ferrite balance when you order.
Performance & Selection Guide
Choose 2205 when: chlorides are serious (seawater, brine, coastal structures, chemical process); loads are high and you want thinner, lighter sections; or stress-corrosion cracking rules out standard austenitics.
Stay with 304/316L when: chlorides are mild, fabrication complexity is high, or cost governs — 2205 carries a premium and needs more welding discipline.
Welding note: duplex welds need controlled heat input and matching 2209-class fillers to preserve the austenite-ferrite balance. Our fabrication team handles duplex welding procedures — see our 2205 fabrication guide for the full engineering picture, and compare grades in our grade comparison.
Typical Applications
- Offshore and marine structures, desalination plant components
- Chemical process vessels and pressure equipment — see our tank and vessel fabrication
- Oil & gas process piping and equipment
- Structural members where high strength allows thinner sections
- Pollution-control and flue-gas scrubbing equipment
FAQ
How much stronger is 2205 than 316L?
Yield strength is roughly double (≥450 MPa vs ≥170 MPa). In practice this often means you can use 30–40% thinner plate for the same design load.
Is 2205 magnetic?
Yes — the ferrite phase makes duplex grades magnetic. This is normal and is how duplex structure is partly verified.
When is 2205 overkill?
For indoor, freshwater or mildly corrosive service, 304/316L does the job at lower cost. 2205 earns its premium in chlorides, high loads or stress-corrosion-risk service.
Do plates ship with certificates?
Yes — mill test certificate (EN 10204 3.1 type) with heat traceability, including chemistry, mechanicals and ferrite balance.
Can you cut and fabricate 2205?
Yes — cutting to size plus full fabrication (forming, duplex welding procedures, machining) from our Taiyuan facility.
How to Order
Send thickness, sizes and quantity — you receive a line-item quotation within two working days with stock confirmation. Mill certificates travel with every delivery. Request a quote or browse our full product range.