We are Riddhi Siddhi Impex, a Mumbai-based Super Duplex Steel S32750 Shims manufacturer and supplier, established in 2002. Our plant slits UNS S32750 shim stock to ASTM A240 / ASME SA-240 from 0.03 mm up. As an ISO 9001, 14001, and 45001 certified company, we hold a 400-500-tonne monthly supply capacity and export to 60+ countries. We also provide EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Super Duplex 2507 shims are thin, precision-slit spacers of 25% chromium duplex stainless steel, used for levelling, alignment, and gap-setting in corrosive plants. The microstructure splits into near-equal austenite and ferrite, which is where the Super Duplex steel shims get their 550 MPa minimum yield. Chromium, molybdenum, and nitrogen together push the PREN past 40, so a shim clamped in seawater or hot brine holds its set thickness instead of pitting away at the faces. These shims find typical use in marine propeller shafts, offshore oil platforms, desalination plants, and chemical processing equipment.
We slit every S32750 shim on our own precision lines from a solution-annealed source coil rather than reselling mill widths. Gauges are around 0.03 mm to 5 mm at widths between 3 mm and 2000 mm, and EN 10204 Type 3.1 / 3.2 mill test certificates accompany orders on request.
We provide ASTM A240 S32750 shims in solution annealed condition, precision-slit in-house, with two surface finishes and four edge options as tabulated below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Solution Annealed (Soft) |
| Surface Finish | 2B, BA (Bright Annealed) |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
| Supply Forms | Cold rolled |
Chromium sets the baseline in UNS S32750 shims. Held at 24.0 to 26.0%, it anchors the passive film that molybdenum and nitrogen then reinforce. ASTM A240 limits follow. PREN = %Cr + 3.3 × %Mo + 16 × %N; mid-range chemistry clears 40.
| 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 |
Super Duplex Stainless Steel S32750 shims ship solution annealed only; no cold-worked temper ladder applies to duplex grades. ASTM A240 sets the minimums below, though elongation stays indicative under about 0.50 mm. Continuous service belongs below roughly 250 °C, since alpha-prime embrittlement develops 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 |
Buyers holding specifications written around EN 1.4410 shims or any other national system can match our stock below. Every designation covers the same 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 utilise the Alloy 2507 shims we slit, fitting them where precise spacing must survive chlorides, heat, and clamping load together.
Platform crews level skid frames, riser clamps, and wellhead equipment on SDSS 2507 shim packs. Crevice corrosion under a clamped face is where carbon steel shims fail; this grade resists it in sour seawater, and the high yield carries bolt loads without creeping.
Pump baseplates, reactor flange gaps, and agitator mounts in acid plants stay aligned on Super Duplex 2507 shims. Hot chloride liquors that pit 316 packs within months leave the PREN-above-40 surface intact, so the set clearance survives from one turnaround to the next.
Hot concentrated brine defines this duty. Contractors fit UNS S32750 shims under pump pedestals, flash chamber internals, and membrane skid rails because nitrogen and molybdenum hold off the pitting that concentrated seawater starts in lesser grades. Thin gauges conform to uneven civil steelwork without cracking.
Shipyards and port fabricators slip 2507 Super Duplex Shims behind stern gear, thruster mounts, and deck machinery. Splash-zone exposure demands a PREN above 40, and the shim delivers it at roughly double austenitic strength, keeping alignment fixed through years of salt spray.
Bleach plant washers and digesters combine heat, acidity, and heavy chloride loading. Maintenance teams pack Super Duplex Steel S32750 shims under bearing pedestals and drive housings here, pairing corrosion resistance with the compressive strength these continuous lines demand between shutdowns.
Every consignment of Super Duplex S32750 shims issued from our warehouses is 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 shims price in India is around ₹500 to ₹700 per kg, while export buyers generally pay about $6.1 to $8.8 per kg depending on thickness, finish, and order quantity. Nickel and molybdenum markets set the base; gauge, width, finish, and quantity move the final figure. Call or WhatsApp us for today's rate.
We manufacture Super Duplex S32750 shims from 0.03 mm to 5 mm thick, slit to any width between 3 mm and 2000 mm, and width at ±0.1 mm tolerance.
Yes, Super Duplex 2507 shims can be custom-slit on our in-house lines to any width from 3 mm to 2000 mm, while the width is held to ±0.1 mm tolerance.
The difference between S32750 and S32760 shims lies in chemistry margins. Both are 25Cr Super Duplex grades under ASTM A240; S32760 adds tungsten and copper for a similar PREN above 40, while S32750 shims are more widely specified.
Super Duplex Steel S32750 shims price in India is around ₹500 to ₹700 per kg, while export buyers generally pay about $6.1 to $8.8 per kg for export, subject to gauge, width, finish, and alloy market movement.
You can source Super Duplex Steel S32750 shims in India from us at Riddhi Siddhi Impex. Our Mumbai warehouse holds ready stock, and we export worldwide as a manufacturer, stockist, and exporter. Phone or WhatsApp us; quotes will be provided within 24 hours.
