Super Duplex 2507 CoilASTM A240 UNS S32750 · Manufacturer, trader & exporter, India
Also sold as UNS S32750 · W.Nr 1.4410 · F53 · SAF 2507
Super Duplex 2507 coil is supplied as full-width mother coil, slit coil or precision strip to ASTM A240. It is a super duplex stainless steel, chosen for seawater and high-chloride service where strength also matters. 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 Super Duplex 2507 Coil?
Super Duplex 2507 coil is a super duplex stainless steel supplied as coil to ASTM A240 (UNS S32750). Buyers specify it for seawater and high-chloride service where strength also matters. It is also sold as UNS S32750, W.Nr 1.4410, F53.
- What it is
- Super duplex stainless steel
- Standard
- ASTM A240
- Forms
- Mother coil · slit coil · strip
- Density
- 7.8 g/cm³
- Finish
- 2B · 2D
- Best at
- Seawater and high-chloride service where strength also matters
Super Duplex 2507 Coil Specification & Sizes
| Material standard | ASTM A240 |
|---|---|
| Grade | Super Duplex 2507 |
| 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 |
Super Duplex 2507 Coil: Slitting & Cut-to-Length Specification
2507 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.
Super Duplex 2507 Coil Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Molybdenum | As specified |
| Nitrogen | As specified |
| Copper | 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 S32750.
Super Duplex 2507 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 S32750 — Solution-annealed plate & sheet.
Density & Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm³ |
| Melting range | 1350 – 1400 °C |
| Magnetic | Magnetic (ferritic phase) |
| PREN (approx.) | ≈ 42 |
Super Duplex 2507 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 Super Duplex 2507 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. Super Duplex 2507 is most often mixed up with Duplex 2205 — 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 | Super Duplex 2507 | Duplex 2205 |
|---|---|---|
| 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 |
Super Duplex 2507 Coil Applications
Super Duplex 2507 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.
Super Duplex 2507 Coil vs 2205, 625 and C276
| Grade | Coil standard | PREN (approx.) | Pick it when |
|---|---|---|---|
| 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 |
| Inconel 625 | ASTM B443 | ≈ 51 | Seawater, high strength and high temperature in one alloy |
| Hastelloy C276 | ASTM B575 | ≈ 68 | The most aggressive mixed acids, wet chlorine and hypochlorite |
PREN = Cr + 3.3 Mo + 16 N, from mid-range chemistry. A screening guide, not a substitute for corrosion data on your medium.
Super Duplex 2507 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 2507 fits.
High chromium, molybdenum and nitrogen put PREN above 40 — the usual threshold for seawater service.
Much higher yield strength than 316L.
Excellent resistance to chloride stress-corrosion cracking.
Keep service below about 250 °C.
How your 2507 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 Super Duplex 2507 Coil
Super Duplex 2507 welds by all common arc processes. A few points our buyers ask about:
| Matching filler | ER2594 (AWS A5.9) |
|---|---|
| Over-alloyed filler | Tight heat-input control and ferrite checks on procedure qualification |
| 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 2507 fittings and 2507 flanges for the matching pipe-system parts.
How to Order Super Duplex 2507 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
Super Duplex 2507 coil — questions buyers ask
Is Super Duplex 2507 the same as UNS S32750?
UNS S32750, W.Nr 1.4410, F53 are names used for Super Duplex 2507 (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 Super Duplex 2507 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 Super Duplex 2507 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 Super Duplex 2507 cut-to-length sheets from coil?
Yes. Coil can be levelled and cut to length; state length tolerance and flatness.
Can Super Duplex 2507 coil be supplied to NACE MR0175?
Super Duplex 2507 (UNS S32750) 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.
Super Duplex 2507 or Hastelloy C276 — which should I choose?
Super Duplex 2507 is chosen for seawater and high-chloride service where strength also matters. Hastelloy C276 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