We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 321 Strips manufacturer and supplier, established in 2002. Our slitting lines process this titanium-stabilised grade to ASTM A240 / ASME SA-240 and AMS 5510, from 0.03 mm to 5 mm thick. We are ISO 9001, ISO 14001, and ISO 45001 certified, maintain a ready stock for wholesale 321 stainless steel strip orders, supply 400-500 tons per month, and provide EN 10204 Type 3.1 and 3.2 test certificates.
Stainless Steel 321 strips are flat-rolled lengths of a titanium-stabilised austenitic chromium-nickel grade. The alloy carries 17.0-19.0% chromium and 9.0-12.0% nickel. Titanium, added at five times the combined carbon and nitrogen content or more, locks up carbon before it forms chromium carbides at grain boundaries. The strip therefore resists intergranular corrosion through the ~815 °C sensitisation range, where unstabilised grades weaken after welding. These strips are used in aerospace and heat exchangers.
We slit every 321 strip on our own Mumbai lines rather than trading mill widths. The grade is at the high-temperature end of our stainless steel strips range. Buyers pick any width between 3 mm and 2000 mm, in annealed condition, with BA, 2B, Scotch-Brite, Matte, Matte PVC, or HR pickled surfaces. Every coil ships with its full test documentation.
We provide ASTM A240 Type 321 strips in annealed condition, cold rolled or hot rolled and pickled, slit to your drawing width, dispatched in coil.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240, AMS 5510 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Scotch-Brite, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Titanium is the key stabilising element in this grade. 321 SS strips hold it at 5x(C+N) minimum to 0.70% maximum, which keeps chromium carbides from precipitating in welds and hot service. The complete ASME SA-240 limits follow.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 0.75 max |
| Chromium (Cr) | 17.0 - 19.0 |
| Nickel (Ni) | 9.0 - 12.0 |
| Titanium (Ti) | 5x(C+N) min, 0.70 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Type 321 strips in annealed condition deliver 515 MPa minimum tensile strength with 40% minimum elongation, so the material draws and bends without cracking. We supply 321 strip in the annealed (soft) temper only.
| Property | Value |
|---|---|
|
Tensile Strength, minimum
|
515 MPa (75 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Elongation in 50 mm, minimum
|
40% |
Buyers overseas can order UNS S32100 strips using any regional designation below. AISI 321, SUS 321, and 1.4541 enquiries all draw on the same material.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S32100 |
| Europe (EN) | X6CrNiTi18-10 |
| Germany (W.Nr) | 1.4541 |
| Japan (JIS) | SUS 321 |
| UK (BS) | 321S31 |
| France (AFNOR) | Z6CNT18-10 |
| Russia (GOST) | 08Ch18N10T |
These 4 industries consume most of the 321 stainless steel strips we slit. Each one picks the grade for steady service between 425 °C and 870 °C, a range that damages leaner austenitic alloys.
Exhaust system makers form 321 Stainless Steel Winding Strip into flexible bellows, manifold heat shields, and flex-coupling liners. Gas temperatures cycle past 800 °C near the manifold, and titanium stabilisation keeps weld seams carbide-free. Gauges down to 0.03 mm suit multi-ply bellows construction.
Process plants run 321 Stainless Steel Slit Coil in expansion joints, spiral-wound gasket windings, and sealing rings around reformers and fired heaters. Type 321 keeps its grain boundaries intact through repeated shutdowns, so joints don't work loose over years of thermal cycling.
Aircraft fabricators specify AMS 5510 material for exhaust cones, firewalls, and engine bay shrouds, where the grade holds useful strength up to 870 °C without adding weight. We slit aerospace orders to the same ±0.1 mm width tolerance as industrial orders.
Heat exchanger fabricators wrap tube bundles with a slit 321 strip and punch baffle seals or spacer bands from a wider coil. Boiler builders fit the same material around economiser casings. Creep resistance matters more than hardness here; annealed strip holds shape under sustained load.
Orders are dispatched from our Mumbai and Taloja warehouses in export-grade packaging, with all documentation prepared according to your chosen Incoterm.
| 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 |
Stainless Steel 321 Strips price range in India is around ₹210-₹290 per kg. Export orders are priced at $2.5-$4/kg. Nickel rates move the figure week to week. Thickness, width, finish, and quantity set the final rate, so call or WhatsApp us for a firm quote.
Stainless Steel 321 strips are used for exhaust bellows, expansion joints, engine gaskets, heat exchanger elements, and chemical plant seals. The grade suits components serving continuously ~815 °C.
Yes, 321 stainless steel strip is better than 304 strip for high-temperature use. Its titanium content prevents carbide formation in the ~815 °C, so it resists intergranular corrosion where 304 sensitises.
SS 321 strips are available from 0.03 mm to 5 mm thickness and 3 mm to 2000 mm width, slit within ±0.1 mm.
The price of SS 321 strips per kg sits around ₹210-₹290 in India and $2.5-$4/kg for export buyers. Send us your thickness, width, and quantity for an exact rate.
Yes, we supply SS 321 strips with EN 10204 Type 3.1 and 3.2 certificates on request, backed by technical data sheets covering the full material properties.
You can get SS 321 strips in Mumbai from us at Riddhi Siddhi Impex. Our warehouse holds this grade in ready stock, and as a manufacturer, exporter, and supplier, we serve buyers across India plus 60+ export markets. Call or WhatsApp us for a quote within 24 hours.
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