2205 Stainless Steel (UNS S32205)
Duplex (austenitic-ferritic) · ASTM A240/A240M, A276, A790/A789 (when named) · Density 7.8 g/cm³
2205 duplex stainless steel (commonly ordered as UNS S32205, with related S31803 chemistry still appearing on older specs) combines roughly twice the annealed yield strength of 304/316-type austenitics with improved resistance to chloride pitting and stress-corrosion cracking in many process, desalination and structural duties. Quote plate, pipe, bar or angle only after the chloride-temperature envelope, crevices, toughness and a qualified duplex weld route are reviewed — PREN alone is not approval.
Quotation brief
Quote 2205 When
Quote 2205 duplex when the RFQ needs higher annealed yield strength and improved chloride pitting / stress-corrosion resistance versus 316L, and the project can control duplex welding, phase balance and toughness. Prefer UNS S32205 (or the exact legacy S31803 window named on the drawing) for plate, pipe, bar and angle, and treat PREN only as a screening index — not as approval for the chloride-temperature envelope.
Best fit
- Solution-annealed plate, structural angle and process piping where duplex strength supports an approved section-design strategy under the project code.
- Desalination, brine, chemical and marine duties in MENA/SEA projects whose temperature, chloride level, crevices and shutdown conditions have been assessed against 316L and 2507.
- Welded projects able to control heat input, interpass temperature, filler selection, heat tint removal and final corrosion condition with qualified duplex procedures.
Limits to check
- Long exposure at elevated temperature can form embrittling intermetallic phases, so 2205 is not a generic furnace or high-temperature grade.
- High strength increases forming load and springback on plate, bar and angle, while incorrect welding can damage phase balance, toughness and corrosion resistance.
- S31803 and S32205 overlap but are not labels to exchange automatically; the ordered chemistry, product standard and project approval must control — PREN alone never approves the duty.
Quoted product forms
Quoted product forms for 2205 Stainless Steel (UNS S32205)
We quote 2205 Stainless Steel as sheet / plate, pipe / tube, bar, angle / profile against the named product standard.
- Traceability: heat or lot identity plus the inspection document named in the RFQ (EN 10204 3.1 when that route supports it).
- Processing: decoiling, cutting, polishing, shearing and beveling as ordered.
- Next step: send product form, size and quantity; we quote the supply route.
Chemical Composition (wt%)
| C | Mn | Si | Cr | Ni | Mo | N | P | S |
|---|---|---|---|---|---|---|---|---|
| ≤0.030 | ≤2.00 | ≤1.00 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | ≤0.030 | ≤0.020 |
Single values are maximums unless a range is shown. Balance: Fe. Per ASTM A240/A240M, A276, A790/A789 (when named).
Mechanical Properties
| Tensile strength | ≥655 MPa (95 ksi) |
|---|---|
| Yield strength (0.2%) | ≥450 MPa (65 ksi) |
| Elongation (50 mm) | ≥25% |
| PREN (screening) | typically ≥34 for S32205 chemistry windows |
Room-temperature minimum values are summarized for solution-annealed flat product under ASTM A240/A240M unless a condition is named in the property label; pipe, tube, bar, angle and thickness can change the requirement.
Physical Properties & Structure
| Density | 7.8 g/cm³ |
|---|---|
| Magnetic response | Magnetic because the microstructure contains a substantial ferrite fraction. |
| Microstructure | Duplex (approximately balanced austenitic-ferritic after correct solution annealing) |
Corrosion Resistance & Limits
- Relative to 304/316-type austenitics, correctly processed 2205 often improves resistance to chloride pitting and chloride stress-corrosion cracking, but warm concentrated chlorides, crevices, deposits, heat tint and unbalanced welds can still initiate attack — do not treat duplex as immune.
- PREN is only a screening index derived from Cr, Mo and N chemistry. Temperature, crevices, weld phase balance, heat tint, deposits and actual solution chemistry still govern suitability versus 316L or super duplex 2507.
- Review design temperature, shutdown chemistry, cathodic protection interaction (where applicable), drainage and cleaning practice for the actual plate, pipe, bar or angle component before approving 2205 from a grade name alone.
Fabrication & Heat Treatment
| Welding | Use a qualified duplex procedure with controlled heat input, interpass temperature and filler selection to maintain phase balance, toughness and corrosion resistance. Remove heat tint when the service demands it. Do not copy generic austenitic WPS numbers onto duplex joints. |
|---|---|
| Forming | Higher yield strength than 304/316 increases forming load and springback on plate, bar and angle. Severe cold work may require solution annealing under a qualified route before corrosion-critical service. |
| Machining | Use rigid equipment, positive feeds and lower cutting speed than common austenitic grades because high strength and work hardening raise cutting load; qualify tools on the delivered condition. |
| Heat treatment | Solution anneal and rapid cooling restore the specified duplex structure after appropriate fabrication routes. Local stress relief can form harmful intermetallic phases and is not a generic remedy for duplex 2205. |
Equivalent Grades
The closest international equivalents of 2205 Stainless Steel are 1.4462 (X2CrNiMoN22-5-3) in the EN system, SUS329J3L in the JIS system, 022Cr23Ni5Mo3N in the GB system.
These are common corresponding designations, not unconditional substitutes. Verify chemistry, mechanical properties, product standard, delivery condition, dimensions and project approval before changing designation.
| System | Designation |
|---|---|
| UNS | S32205 (preferred modern); S31803 (legacy / tighter-window overlap — confirm RFQ) |
| EN | 1.4462 (X2CrNiMoN22-5-3) |
| JIS | SUS329J3L |
| GB | 022Cr23Ni5Mo3N |
Ordering Checks for 2205
- State UNS S32205 or the legacy S31803 window exactly as approved, product form (plate/pipe/tube/bar/angle), ASTM A240, A276, A790/A789 or the governing edition, and solution-annealed condition.
- Provide design temperature, chloride chemistry, pressure, corrosion allowance, crevice conditions, impact-test needs and whether 316L or super duplex 2507 was considered.
- Define dimensions or NPS/schedule, tolerance, surface/finish, weld procedure controls, heat-tint cleaning and any ferrite or corrosion-test method with acceptance criteria.
- Request heat-specific MTC / EN 10204 3.1 (or the inspection document named in the RFQ), chemistry, tensile results, heat treatment and lot traceability — see the site EN 10204 guide when writing the document list.
Reference Product Forms & Dimensional Ranges
Common reference product forms for 2205 stainless steel: Sheet / Plate, Pipe / Tube, Bar, Angle / Profile.
| Finishes | No.1, 2B, pickled / descaled; polished or ground when the product route supports it |
|---|---|
| Plate thickness | Common inquiry about 3–60 mm (wider ranges quoted to A240 when named) |
| Pipe / tube | Quoted to ASTM A790/A789 or the project piping class with NPS/schedule or OD/wall, seamless or welded |
| Bar / angle / profile | Round bar commonly 10–250 mm; angle and other profiles quoted to the governing dimensional standard when stocked or rolled |
Common surface and delivery options
- No.1, 2B, BA or mechanically polished finish when supported by the product route
- Annealed and pickled, descaled or polished tube/pipe finish as specified
- Hot rolled, peeled, bright drawn, ground or polished bar condition according to tolerance
- Angle and profile surface condition per the dimensional standard and any protective coating agreed in the RFQ
These published ranges are engineering references, not a live-stock or production-capability promise. Send the required product form, dimensions, condition and finish; we quote the matching supply route.
Browse related product hubs:Sheet & plate,Coil & strip,Pipe & tube,Bar & rod.
Typical Applications
- Chemical and cargo tanks under an approved duplex materials class
- Desalination, brine and water-treatment piping and vessels
- Marine and offshore structures where 2205 is project-approved
- Pressure vessels and heat exchangers designed for duplex strength and toughness
- Bridges, load-bearing architecture and structural plate or angle when the code permits duplex
2205 Products We Export
2205 Duplex Stainless Steel Plate
2205 duplex stainless steel plate to ASTM A240 for chloride, chemical and structural service, supplied solution annealed with cutting, testing and traceability options.
View details →
2205 Duplex Stainless Steel Pipe
2205 duplex ASTM A790 seamless or welded pipe for chloride process, water and offshore duty. Common inquiry range NPS 1/2–24, Sch 10S/40S/80S, with quoted tests and heat traceability.
View details →
2205 Duplex Stainless Steel Round Bar
2205 duplex (S32205) solution-annealed round bar. Common inquiry range 10–250 mm, 3 m / 6 m or cut-to-length, with quoted ferrite and corrosion checks.
View details →
2205 Compared With Other Grades
Related buyer guides:
Frequently Asked Questions
What are 2205 duplex stainless steel properties for plate, pipe, bar and angle?
For solution-annealed flat product summarized under ASTM A240/A240M, UNS S32205 typically lists minimum tensile ≥655 MPa (95 ksi), 0.2% yield ≥450 MPa (65 ksi) and elongation ≥25%, with a PREN screening index often cited around ≥34 for the tighter S32205 chemistry window. These are room-temperature engineering minima for the annealed condition — pipe (for example ASTM A790/A789), bar (A276) and angle/profile orders follow their own product standards and dimensions. Confirm chemistry, tensile results, heat treatment and the contracted edition on the MTC before approval; do not treat displayed tables as contractual acceptance limits.
How does 2205 compare with 316L for chloride and stress-corrosion service?
2205 is often selected when designers need higher yield strength and improved resistance to chloride pitting and chloride stress-corrosion cracking relative to molybdenum-bearing austenitic 316L — but it is not an automatic upgrade. Temperature, chloride concentration, crevices, deposits, weld heat tint, phase balance and shutdown chemistry still govern suitability; PREN is only a screening index. Where the project already approves 316L and exposures are mild, stay with 316L. Where chlorides, higher strength or SCC risk dominate, evaluate 2205 (or step up to super duplex 2507) with the materials engineer. Pairwise RFQ decisions belong on the site 2205 vs 316L compare page when one duty must choose.
What is the difference between UNS S32205 and S31803 for 2205 orders?
Both designations sit in the commercial '2205' family and overlap with EN 1.4462, but they are not labels to swap automatically. S32205 is the tighter modern chemistry window (notably for chromium, molybdenum and nitrogen) that many current ASTM flat-product and piping specifications prefer; S31803 is the older, broader designation still named on legacy drawings and purchase orders. Dual marking is valid only when the heat and MTC meet every chemistry and mechanical rule the order cites. Write the required UNS (or EN) designation explicitly in the RFQ and reject silent substitutions.
What welding and heat-input cautions apply to 2205 duplex?
Use a qualified duplex welding procedure with controlled heat input, interpass temperature, matching or project-approved duplex filler, and cleaning that removes heat tint when corrosion service demands it. Excess heat input or slow cooling can shift ferrite/austenite balance and risk embrittling intermetallic phases; too-low heat input can leave excess ferrite and hurt toughness or corrosion resistance. This page does not publish WPS parameters — qualify heat input, interpass limits, purge, filler and NDT on the actual thickness and joint design under the project welding specification. Local stress-relief heat treatments that can form sigma or other harmful phases are not a generic remedy.
Published by Tsingshan (Shandong) Iron & Steel Co., Ltd..Sources, update policy and technical limitations.
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