2507 super duplex stainless steel coil (UNS S32750 / 1.4410) is specified for aggressive chloride and high-pressure service such as cargo tanks, heat exchangers and hydraulic piping. It offers high pitting resistance and roughly double the yield strength of 316L. Thickness, width, finish and MTC / EN 10204 3.1 should be confirmed with GNEE STEEL; common hot-rolled coil thickness runs about 1.2–10 mm with wider/other sizes available to order.
Products Description
2507 is a super duplex stainless steel - a family that mixes roughly equal austenite and ferrite phases to get both the corrosion resistance of austenitic grades and the strength of ferritic grades. Its UNS number is S32750 and its European designation is 1.4410 (also written 00Cr25Ni7Mo4N / 022Cr25Ni7Mo4N). For buyers specifying 2507, the appeal is straightforward: it resists pitting and crevice corrosion in chloride-rich, high-pressure environments far better than 316L or even 2205, while being roughly twice as strong, so you can use thinner sections and save weight in tanks, piping and offshore structures.
Specifications
| Item | Parameter | Value (or confirm with GNEE STEEL) |
| 1 | Grade / UNS / EN | 2507 / S32750 / 1.4410 (00Cr25Ni7Mo4N, 022Cr25Ni7Mo4N) |
| 2 | Product form | Hot rolled stainless coil / strip; also sheet/plate on request |
| 3 | Thickness | Listing shows 1.2–10 mm (H1) and 0.2–60 mm (spec block); confirm per form |
| 4 | Width | Up to 2000 mm (coil); strip from ~3.2 mm |
| 5 | Coil weight | Up to ~40 MT; ID 508 / 610 mm |
| 6 | Finish | NO.1, 1D, 2D, hot-rolled, annealed & pickled, mill finish |
| 7 | Standards | ASTM / ASME / AISI / EN / BS / GB / DIN / JIS / SUS |
| 8 | Density | 7.93 g/cm³ |
| 9 | Chemical (C) | ≤0.03% |
| 10 | Chemical (Cr / Ni) | 24.0–26.0% / 6.0–8.0% |
| 11 | Chemical (Mo / N) | 3.0–5.0% / 0.24–0.35% |
| 12 | Certifications | SGS, BV, IQI, TUV, ISO, CE (per listing) |
| 13 | MOQ / capacity | 1 ton; supply ~5000 tons/month |
| 14 | Lead time | 7–15 working days after 30% deposit |
Applications
2507 is chosen where 316L would corrode or 2205 would be marginal. Typical uses from the listing include cargo tanks, fittings, heat exchangers, hot-water tanks, hydraulic piping, lifting and pulley equipment, propellers, shafts, spiral-wound gaskets, storage vessels and water heaters. The high molybdenum (3–5%) and nitrogen (0.24–0.35%) push its pitting resistance equivalent number (PREN) into the super-duplex range, which is why it survives seawater, desalination, flue-gas scrubbers and sour service.
For the buyer, the practical consequence is longer life and less wall thickness - but also stricter fabrication rules: duplex must be welded within a controlled heat-input window and not overheated, or the phase balance and corrosion resistance suffer. Specify the exact environment (chloride level, temperature, pressure) so GNEE STEEL can confirm 2507 is the right, not merely the most expensive, choice.
Procurement & Ordering
The listing shows a low MOQ of 1 ton and a supply ability around 5000 tons/month, with lead time about 7–15 working days after receipt of a 30% deposit; balance is paid against documents. Price terms can be FOB, CFR, CIF or EXW, and packing is standard seaworthy or as required. Because duplex is sold on chemistry and phase balance, insist on MTC / EN 10204 3.1 and, where the job demands, third-party SGS / BV / TUV inspection. Shipments typically load from Tianjin or Qingdao. If your engineer specified 2205 but the environment is harsher, ask GNEE STEEL whether upgrading to 2507 is justified, or whether a leaner grade is acceptable to control cost - the decision should be based on the corrosion data, not on habit.
Buyer's Checklist
For duplex, the certificate is everything: require MTC / EN 10204 3.1 showing the full chemistry and the ferrite-austenite balance, plus a PMI (positive material identification) check on arrival. State the finish (NO.1, pickled) and the exact width/coil weight for your slitting line. A frequent error is welding 2507 with 316L procedures - the heat input and filler must be duplex-qualified or corrosion resistance drops. Confirm with GNEE STEEL that the coil is supplied in the solution-annealed condition and suitable for your corrosive service before cutting.
FAQ
Q: When do I need 2507 instead of 2205 or 316L?
A: When chloride levels, temperature or pressure exceed what 2205/316L handle reliably - seawater, desalination, scrubbers, high-pressure tanks. Confirm with your corrosion spec.
Q: Is S32750 the same as 1.4410?
A: Yes. S32750 is the UNS number and 1.4410 the EN material number for 2507 super duplex.
Q: Can 2507 replace 316L dimension-for-dimension?
A: Not directly - 2507 is roughly twice as strong, so you can often use thinner walls, but the design must be re-checked; do not assume a straight swap.
Q: Any welding cautions I should pass to my shop?
A: Duplex needs controlled heat input and avoidance of overheating to keep the austenite/ferrite balance; use qualified procedures and confirm post-weld treatment with GNEE STEEL's data.
Q: Do you provide MTC and inspection?
A: Yes, MTC / EN 10204 3.1 per shipment, with SGS / BV / TUV inspection available.
Q: What thickness can I get as hot-rolled coil?
A: The listing references ~1.2–10 mm for coil and a wider 0.2–60 mm range for other forms; confirm the exact size and tolerance (±1% listed) you need.
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