We are Riddhi Siddhi Impex, a Mumbai-based Super Duplex Steel S32750 Foils manufacturer and supplier, established in 2002. Our lines slit UNS S32750 foil to ASTM A240 / ASME SA-240, 0.03 mm to 0.08 mm thick, at ±0.1 mm width tolerance. As an ISO 9001, 14001, and 45001 certified company, we maintain a monthly supply capacity of 400-500 tonnes and export to more than 60 countries.
Super Duplex Steel S32750 foils are thin-gauge flat products of 25% chromium duplex stainless steel, slit from solution-annealed coil for gaskets, diaphragms, sensing elements, and precision-formed parts in chloride-heavy service. Austenite and ferrite share the microstructure in near-equal halves, the balance behind the grade's 550 MPa minimum yield. Molybdenum at 3.0 to 5.0% and nitrogen at 0.24 to 0.32% lift the PREN past 40, roughly double the pitting index of 316L. These strips are widely used in marine engineering and desalination plants.
As a reliable Super Duplex steel S32750 Foils supplier, every foil we dispatch starts as a source coil on our own slitting lines. EN 10204 Type 3.1 / 3.2 mill test certificates accompany orders on request.
We provide ASTM A240 S32750 foils in solution annealed condition, slit and edge-conditioned in-house as tabulated below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 0.08 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Solution Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Matte |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
| Supply Forms | Cold rolled |
Nitrogen is at 0.24 to 0.32%, it strengthens the austenite phase and counts sixteenfold in the PREN figure. ASTM A240 limits appear below.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.20 max |
| Phosphorus (P) | 0.035 max |
| Sulphur (S) | 0.020 max |
| Silicon (Si) | 0.80 max |
| Chromium (Cr) | 24.0 to 26.0 |
| Nickel (Ni) | 6.0 to 8.0 |
| Molybdenum (Mo) | 3.0 to 5.0 |
| Nitrogen (N) | 0.24 to 0.32 |
| Copper (Cu) | 0.50 max |
Tensile strength is at 800 MPa minimum under ASTM A240, well above any austenitic foil. SDSS 2507 foils ship solution annealed only, as duplex grades carry no cold-worked temper ladder. Elongation minimums stay indicative, and continuous duty belongs under roughly 250 °C because alpha-prime embrittlement sets in near 475 °C.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
800 MPa (116 ksi) |
|
Yield Strength (0.2% offset), minimum
|
550 MPa (80 ksi) |
|
Elongation in 50 mm, minimum
|
15% |
|
Hardness, maximum
|
310 HBW / 32 HRC |
Procurement teams ordering 1.4410 foils against European, Japanese, or Chinese paperwork can cross-check the designations below. All describe one 25Cr super duplex chemistry.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S32750 |
| Europe (EN) | X2CrNiMoN25-7-4 |
| Germany (W.Nr) | 1.4410 |
| Japan (JIS) | SUS329J4L |
| China (GB) | 022Cr25Ni7Mo4N |
These 5 industries consistently use Alloy 2507 foils leaving from our lines, each pairing thin-gauge precision with chloride resistance that standard duplex cannot guarantee.
Instrument diaphragms, seal rings, and control-line wrap on platforms run in seawater that turns sour without warning. Fabricators specify SDSS 2507 foil because molybdenum and nitrogen resist pitting and hydrogen-assisted cracking, while the 800 MPa tensile floor carries clamping loads at sub-millimetre gauges.
Acid plants use UNS S32750 foils in gasket stock, bellows, and heat exchanger sealing strips where hot chloride liquors attack 316 parts within months. The passive film holds through sulphuric and phosphoric streams, and the 550 MPa yield permits thinner formed sections.
Flash chambers and membrane skids concentrate hot brine, the harshest routine chloride duty in industry. Contractors use 2507 Super Duplex foils in chamber seals, instrument elements, and heat recovery hardware because a PREN above 40 stops pitting where evaporation concentrates salts.
Shipyards wrap sensors, line sealing faces, and shim splash-zone hardware with 25Cr Super Duplex foil. Stagnant seawater inside crevices defeats ordinary stainless steel quickly; S32750 chemistry stalls that damage while doubling austenitic strength, so thin parts survive years of immersion.
Bleach plant washers and filters combine heat, acidity, and chloride loading. Foil-fed sensing and sealing components in S32750 Super Duplex Steel hold through chlorine dioxide environments that corrode standard duplex, with gauges down to 0.03 mm suiting instrumentation packs.
Consignments of S32750 foils leave from our Mumbai and Taloja warehouses packed for sea freight worldwide.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
Super Duplex Steel S32750 Foils price in India runs around ₹500 to ₹700 per kg. Export orders generally land between $7.3 and $10 per kg. Nickel and molybdenum markets set the base, while gauge, width, finish, and quantity move the final figure. Call or WhatsApp us for today's rate.
The thickness range available for Super Duplex Steel S32750 foils is 0.03 mm to 0.08 mm, custom-slit to any width from 3 mm to 2000 mm at ±0.1 mm tolerance.
The difference between S32750 and S32760 foils depends on alloying. S32750 relies on 3.0 to 5.0% molybdenum with 0.24 to 0.32% nitrogen alone, while S32760 adds tungsten and copper for a similar PREN above 40. Both meet ASTM A240.
Yes, Super Duplex 2507 foils can be custom slit on our in-house lines to widths anywhere between 3 mm and 2000 mm, with tolerance held at ±0.1 mm.
We can supply EN 10204 Type 3.1 and 3.2 mill test certificates with our S32750 foils certifying to ASTM A240 chemistry and mechanical values, on request.
You can source Super Duplex Steel UNS S32750 Foils in India from us at Riddhi Siddhi Impex. Ready stock can be kept in our Mumbai and Taloja warehouses for dispatch in 4 to 5 days, and we export worldwide as a manufacturer, stockist, and exporter. Phone or WhatsApp us and get a quote within 24 hours.
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