Duplex 2205 CoilASTM A240 UNS S32205 · Manufacturer, trader & exporter, India
Also sold as UNS S32205 / S31803 · W.Nr 1.4462 · F51 / F60 · SAF 2205
Duplex 2205 coil is supplied as full-width mother coil, slit coil or precision strip to ASTM A240. It is a duplex (austenitic-ferritic) stainless steel, chosen for strength with chloride resistance at a stainless-steel budget. Kanak Steel & Engineering Co. manufactures, trades and exports it from Mumbai; EN 10204 3.1 or 3.2 certificates are available on request / as specified in the PO. Markets we have supplied to include Oman, UAE, Saudi Arabia, Brazil, Argentina, Spain and Chile (India is the home market).
- Stock & mill supply
- EN 10204 3.1 / 3.2
- PMI on request
- NACE MR0175 on request
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is Duplex 2205 Coil?
Duplex 2205 coil is a duplex (austenitic-ferritic) stainless steel supplied as coil to ASTM A240 (UNS S32205). Buyers specify it for strength with chloride resistance at a stainless-steel budget. It is also sold as UNS S32205 / S31803, W.Nr 1.4462, F51 / F60.
- What it is
- Duplex (austenitic-ferritic) stainless steel
- Standard
- ASTM A240
- Forms
- Mother coil · slit coil · strip
- Density
- 7.8 g/cm³
- Finish
- 2B · 2D
- Best at
- Strength with chloride resistance at a stainless-steel budget
Duplex 2205 Coil Specification & Sizes
| Material standard | ASTM A240 |
|---|---|
| Grade | Duplex 2205 |
| Thickness | 0.1 mm to 6 mm, depending on mill route |
| Width | Mill width, or slit from 10 mm upwards |
| Coil weight & ID | To order — state maximum coil weight and inner diameter |
| Finish | 2B · 2D |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
Duplex 2205 Coil: Slitting & Cut-to-Length Specification
2205 coil is bought for a production line, so state thickness, slit width, inner diameter and maximum coil weight with the grade.
| Standard | ASTM A240 |
|---|---|
| Thickness tolerance | Per ASTM A480 |
| Finish | 2B · 2D |
| Note | Duplex strip is about twice as strong as 316L — allow for higher slitting and forming loads |
ID, coil weight, edge, camber and interleaving: see the coil guide.
Duplex 2205 Coil Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Nitrogen | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
| Iron | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S32205.
Duplex 2205 Coil Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S32205 — Solution-annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting range | 1385 – 1445 °C |
| Magnetic | Magnetic (ferritic phase) |
| PREN (approx.) | ≈ 35 |
Duplex 2205 Equivalent Grades
Six-digit Harmonized System heading (iron and steel, chapter 72–73). Your country adds its own digits — confirm with your customs broker. All HS codes.
How to Verify Duplex 2205 Coil with PMI
Positive material identification with a handheld XRF gun confirms the alloy on the piece itself, in seconds, before it is cut or welded. Duplex 2205 is most often mixed up with Super Duplex 2507 — the table shows which elements tell them apart.
Handheld XRF does not measure carbon or nitrogen, so it cannot confirm the nitrogen that duplex depends on: that comes from the mill certificate or optical emission (OES) testing. PMI can be arranged on request — state it on your enquiry.
Under technical review for TDS.
| Element | Duplex 2205 | Super Duplex 2507 |
|---|---|---|
| Nickel | As specified | As specified |
| Chromium | As specified | As specified |
| Molybdenum | As specified | As specified |
| Copper | — | As specified |
| Iron | As specified | As specified |
| Manganese | As specified | As specified |
Duplex 2205 Coil Applications
Duplex 2205 is specified when the cheaper grade will not survive the service but a higher alloy would be more than the job needs. These are the jobs our buyers use it for.
Duplex 2205 Coil vs 316L, 904L and 2507
| Grade | Coil standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| SS 316 / 316L | ASTM A240 | ≈ 24 | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 904L | ASTM A240 | ≈ 35 | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| Duplex 2205 | ASTM A240 | ≈ 35 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 | ASTM A240 | ≈ 42 | Seawater and high-chloride service where strength also matters |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Duplex 2205 Corrosion Resistance — Element by Element
Each alloying addition has a job. Knowing which one protects against your medium is the quickest way to judge whether 2205 fits.
A roughly 50/50 austenite-ferrite structure gives about twice the yield strength of 316L, so walls can be thinner.
Chromium, molybdenum and nitrogen give a PREN around 35 — well above 316L.
The ferrite phase gives far better resistance to chloride stress-corrosion cracking than austenitic grades.
Keep service below about 300 °C to avoid embrittlement.
How your 2205 coil order runs
- 01Enquiry review — we confirm size, standard edition and documents against your MR or drawing.
- 02Heat selection & PMI — the mill certificate is checked against your order; PMI can be arranged depending on product and requirements, as specified in the PO.
- 03Processing — cutting, machining or bevelling to your specification, with heat numbers marked as specified in the PO.
- 04Inspection — your third-party inspector witnesses, or we share photos and test reports.
- 05Packing & dispatch — seaworthy packing from Nhava Sheva (JNPT), Mumbai, FOB or CIF, documents sent before the vessel sails.
Welding & Fabricating Duplex 2205 Coil
Duplex 2205 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER2209 (AWS A5.9) |
|---|---|
| Over-alloyed filler | Control heat input 0.5–2.5 kJ/mm to keep the phase balance |
| Preheat | Not required; keep interpass temperature low |
| Cutting | Thermal or abrasive cutting; grind off heat-tinted edges before welding |
Follow your approved WPS; this is general guidance. See also 2205 fittings and 2205 flanges for the matching pipe-system parts.
How to Order Duplex 2205 Coil: RFQ Checklist
Get an accurate quote the first time. Copy this list into your enquiry:
- Thickness and width
- Coil weight and inner diameter
- Finish and edge (mill or slit)
- Certificate type
- Delivery port and date
Duplex 2205 coil — questions buyers ask
Is Duplex 2205 the same as UNS S32205 / S31803?
UNS S32205 / S31803, W.Nr 1.4462, F51 / F60 are names used for Duplex 2205 (W.Nr / EN numbers and older UNS variants are the closest designations; their limits can differ slightly, so specify the UNS number and ASTM grade on the order), and coil is ordered to ASTM A240 whichever name is on the enquiry.
Can Duplex 2205 coil be slit to width?
Yes. Coils can be slit to narrow widths for stamping, tube making and spring work; state width tolerance and coil weight on the enquiry.
What inner diameter do Duplex 2205 coils have?
508 mm (20") and 610 mm (24") are the common IDs. Tell us your decoiler ID and maximum coil weight and we slit to suit.
Can I order Duplex 2205 cut-to-length sheets from coil?
Yes. Coil can be levelled and cut to length; state length tolerance and flatness.
Can Duplex 2205 coil be supplied to NACE MR0175?
Duplex 2205 (UNS S32205) can be supplied for sour service when the PO specifies NACE MR0175 / ISO 15156; acceptability depends on the material condition, hardness and the environmental limits in that standard, which the purchaser must confirm for the application.
Duplex 2205 or Super Duplex 2507 — which should I choose?
Duplex 2205 is chosen for strength with chloride resistance at a stainless-steel budget. Super Duplex 2507 is the step up when you need more pitting resistance or strength. See the comparison table on this page, or ask us with your process conditions.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026