We are Riddhi Siddhi Impex, an ISO 9001, ISO 14001, and ISO 45001-certified Duplex Steel Shims manufacturer and supplier, based in Mumbai and established in 2002. Our slitting lines produce duplex stainless shim stock to ASTM A240 / ASME SA-240, custom-cut to width from 3 mm to 2000 mm. We hold a monthly supply capacity of 400 to 500 tonnes plus dispatch within 4 to 5 days, which keeps plant turnarounds on schedule.
Duplex steel shims are thin, flat spacers cut from two-phase stainless steel that carries austenite and ferrite in near-equal shares. Fitters slide them between mating faces to close gaps, square up alignment, and level machinery bases. That dual microstructure earns the material its place in shim work. Strength runs close to double that of 304 or 316, so a duplex spacer takes full bolt load without flattening, and the chromium-molybdenum-nitrogen chemistry shrugs off the chloride pitting that damages ordinary stainless packing inside a damp joint. Whatever setting the millwright dials in stays put.
As a reliable Duplex Steel Shims supplier, we slit coils in-house. Thickness spans 0.03 mm to 5 mm; width goes anywhere from 3 mm to 2000 mm at ±0.1 mm. Slit, deburred, and round edge conditions are all available. Heat-level traceability follows each batch, and most orders go out from standing stock at our Mumbai and Taloja warehouses.
We supply annealed Duplex 2205 shim stock with high strength, corrosion resistance, and fast delivery from extensive UNS S32205 coil inventory.
We finish duplex shim stock in four ways: BA, 2B, Matte, and Matte PVC. Thickness and rolling route determine what applies at a given gauge.
BA
Annealing under protective gas keeps the surface bright and free of oxide. Instrument shops usually ask for this one.
2B
Rolling, annealing, and a pickling pass give 2B its smooth, low-sheen face. Most duplex shim orders ship this way.
Matte
A dull matte face cuts glare and masks minor handling scuffs in assemblies that leave the shim edge exposed.
Matte
PVC film over the matte surface protects against scratches through transit and fabrication, then peels away at installation.
3 sectors account for most of the duplex shim tonnage we dispatch. Each pairs chloride exposure with genuine mechanical load.
Process plants pack Duplex 2205 shims under pump bases, reactor flanges, and exchanger supports. Chloride-laden streams retire standard stainless packing early in a campaign, while the duplex grade holds its dimension and keeps rotating equipment true between shutdowns.
Offshore platforms and sour-service installations set valve mounts, wellhead assemblies, and instrumentation seats on Duplex 2205 shim stock. The grade bears heavy clamping loads through constant seawater spray and produced fluids, and pieces held to ±0.1 mm seat in the joint without site dressing.
Hot, concentrated brine defines this duty. Desalination plants ship high-pressure pump skids and evaporator internals with Duplex 2205 stock, and shipyards fit the same material at seawater piping supports, where a pitted spacer would let the setting sink season after season.
Documentation accompanies every order. Riddhi Siddhi Impex holds three ISO certifications and backs each dispatch with heat traceability.
Each consignment carries an EN 10204 Type 3.1 mill test certificate linked to the parent mill heat. Type 3.2 comes on request.
ISO 9001:2015 certifies our quality management system, from coil receipt through slitting to outgoing inspection.
Environmental management runs under ISO 14001:2015, covering how we store, process, and move material at both sites.
Our occupational health and safety practices carry ISO 45001:2018 certification across the slitting floor and both warehouses.
Duplex is a stainless steel, so flat-rolled duplex shim stock is classified under HS heading 7220 when narrower than 600 mm and under 7219 at 600 mm or wider. Your customs broker can confirm the exact subheading.
Yes, we hold Duplex stainless steel shims coil on the shelf all year. Dispatch normally takes 4 to 5 days, while urgent requirements move in 2 to 3 days.
Custom sizes are our standard work. We slit thicknesses from 0.03 mm to 5 mm and widths from 3 mm to 2000 mm, holding ±0.1 mm.
Riddhi Siddhi Impex manufactures and supplies duplex steel shims from Mumbai and has served Indian and overseas buyers since 2002. Phone or WhatsApp us, and your quote will arrive within 24 hours.
