Stockist & supplier ASTM A240 · ASME SA-240 · ASTM A480
Duplex 2205 Plates — ASTM A240 UNS S32205 / S31803
Duplex 2205 plate is a ferritic-austenitic stainless steel plate with high strength and chloride stress-corrosion resistance. Teshi Group stocks and supplies ASTM A240 / ASME SA-240 UNS S32205 and S31803 plate and sheet. Quotes are sent in 24–48 hours.
Also called: duplex plate, 2205 plate, UNS S32205 plate, UNS S31803 plate, 1.4462 plate
What is a Duplex 2205 Plate?
Duplex 2205 has a mixed structure of roughly equal ferrite and austenite. With about 22% chromium, 3% molybdenum and added nitrogen, it resists pitting, crevice corrosion and chloride stress-corrosion cracking much better than 316L, and its yield strength is about twice that of austenitic grades, allowing thinner walls. UNS S32205 has tighter, higher limits for Cr, Mo and N than the older S31803, and plate is often dual-certified. It is used in offshore and onshore oil and gas, desalination, chemical tankers, pulp and paper, and process vessels.
Key features
- Stockist and supplier — sourced from stainless mills; Teshi does not manufacture plate
- ASTM A240 / ASME SA-240 UNS S32205 and S31803
- Dual-certified S32205/S31803 available
- 450 MPa minimum yield — about twice 316L
- Plate and sheet; other sizes supplied against order
- A182 F51 / F60 duplex flanges manufactured by Teshi
Specification
| Supply | Stockist & supplier — Teshi Group, India |
|---|---|
| Standard | ASTM A240 / ASME SA-240; general requirements ASTM A480 |
| Grades | S32205 (2205), S31803 |
| Product forms | Plate (3/16 in / 4.76 mm and thicker per ASTM A480), sheet and coil; other sizes supplied against order |
| Condition | Solution annealed and descaled (pickled) |
| Finish | No.1 (hot rolled, annealed, pickled) for plate; 2B, BA or No. 4 for sheet |
| Other plate grades stocked | Carbon / boiler: IS 2062 E250–E450, ASTM A36, A516 Gr 60 / 70, A537; Cr-Mo: ASTM A387 Gr 11, 12, 22, 91; stainless: ASTM A240 304 / 304L / 304H, 309S, 310S, 316 / 316L / 316H / 316Ti, 317L, 321 / 321H, 347 / 347H, 410, 430, 904L, 254 SMO; duplex S31803 / S32205; super duplex S32750 / S32760; nickel: Monel 400 (B127), Inconel 600 (B168), Inconel 625 (B443), Incoloy 800 / 800H / 800HT (B409), Incoloy 825 (B424), Hastelloy C276 / C22 (B575), Hastelloy B2 / B3 (B333), Alloy 20 (B463), Nickel 200 / 201 (B162); titanium Gr 1, 2, 5, 7, 12 (B265); Cu-Ni 90/10, 70/30 (B171) |
| Testing | Chemical and tensile tests per A240; ASTM A923 (detrimental intermetallic phase) test when specified |
| Documents | Mill test certificate to EN 10204 3.1; EN 10204 3.2 / third-party inspection when the order specifies |
Applications
- Offshore and onshore oil and gas equipment
- Desalination plant
- Chemical tankers and storage
- Pulp and paper digesters
- Heat exchangers in chloride service
Chemical composition — duplex 2205 (ASTM A240)
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| S32205 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
| S31803 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
Maximum unless a range is shown; % by weight. Per ASTM A240 Table 1.
Mechanical properties
| UNS | Tensile, min (MPa) | Yield 0.2%, min (MPa) | Elongation in 50 mm, min (%) | Hardness, max |
|---|---|---|---|---|
| S32205 | 655 | 450 | 25 | 293 HBW / 31 HRC |
| S31803 | 620 | 450 | 25 | 293 HBW / 31 HRC |
Per ASTM A240 Table 2.
Technical data sheets
Dimensions & weights
Material grades
All gradesFAQ
Duplex 2205 Plate: common questions
What is the difference between S31803 and S32205?
Both are 2205 duplex. S32205 has higher minimum chromium, molybdenum and nitrogen, giving better and more consistent pitting resistance. Plate meeting both is often dual-certified.
Why choose duplex over 316L?
Duplex 2205 has higher strength (450 MPa yield against 170 MPa) and better resistance to chloride pitting and stress-corrosion cracking, so it suits seawater-related and high-chloride service.
Does duplex need special welding?
Yes. Heat input and interpass temperature must be controlled to keep the ferrite-austenite balance, and ferrite checks are often specified. Matching or over-alloyed filler metals are used.
Does Teshi manufacture duplex plate?
No. Teshi Group is a stockist and supplier of Duplex 2205 Plate, sourced from established mills and supplied with the original mill test certificate. Teshi is an OEM manufacturer of flanges, fittings, fasteners, valves and custom fabrications, which can be ordered with it.
Need a size or grade not listed here?
We source against your specification from approved mills, with mill test certificates and inspection before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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