We are Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier of Stainless Steel 321 Foils, established in 2002. We slit titanium-stabilised austenitic foil to ASTM A240 / ASME SA-240, from 0.03 mm to 0.08 mm thick. Our ISO 9001, 14001, and 45001 certified firm holds ready stock, a monthly supply capacity of 400 to 500 tonnes, and ships with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 321 foils are ultra-thin, titanium-stabilised austenitic strips, cold rolled to gauges as fine as 0.03 mm and carrying 17 to 19% chromium with 9 to 12% nickel. Titanium added at five times the combined carbon and nitrogen locks carbon into stable carbide, which keeps chromium in solution and blocks intergranular corrosion through the 425 to 815 °C sensitisation band. This stainless steel foil holds oxidation resistance approaching 900 °C, so it wraps heat-treated parts where plain Type 304 would sensitise.
As a trusted Stainless Steel 321 Foil supplier and manufacturer, we slit every foil in-house on our own mills and slitting lines rather than melting the alloy. Stock leaves annealed soft in any width between 3 mm and 2000 mm, held to ±0.1 mm. Buyers choose BA, 2B, matte PVC, or matte surfaces with slit or deburred edges, and test papers travel with each order on request.
We provide ASTM A240 Type 321 foil in the annealed soft condition, custom-slit from ready inventory, with the finish, edge, and coil options 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 | Annealed (Soft) |
| Supply Form | Cold Rolled (CR) |
| Surface Finish | BA (Bright Annealed), 2B, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Titanium defines this grade. Added at five times the combined carbon and nitrogen, it forms stable carbides and frees chromium to guard the surface, as the ASTM A240 limits below confirm.
| Element | Composition (% by weight) |
|---|---|
| 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) | 17.00 to 19.00 |
| Nickel (Ni) | 9.00 to 12.00 |
| Titanium (Ti) | 5x(C+N) min, 0.70 max |
| Nitrogen (N) | 0.10 max |
| Iron (Fe) | Balance |
Annealed SS 321 foil stretches 40% minimum, so it wraps and folds without cracking. Foils ship soft only; below the standard's thin-gauge threshold near 0.38 mm, treat the figures as indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
515 MPa (75 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Elongation in 50 mm, minimum
|
40% |
|
Hardness, maximum
|
217 HBW / 95 HRB |
Buyers ordering UNS S32100 foil, EN 1.4541 foil, or SUS 321 material can cross-reference the regional designations listed below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S32100 |
| Europe (EN) | X6CrNiTi18-10 |
| Germany (W.Nr) | 1.4541 |
| Japan (JIS) | SUS 321 |
| China (GB) | 06Cr18Ni11Ti |
| Russia (GOST) | 08Х18Н10Т |
These 4 industries use most of the 321 Ti-stabilised foil we slit, each choosing the grade for weld stability and oxidation resistance under sustained heat.
Heat treaters wrap tool steel and bright parts in SS 321 foil before hardening, sealing out air so surfaces come out scale-free. The stabilised structure survives repeated furnace cycles above 800 °C, and thin annealed stock folds tightly around complex shapes.
Aerospace builders use Alloy 321 foil for thermal blankets, firewall shielding, and bellows where mass must stay low. The foil keeps its corrosion resistance across welded seams without a post-weld anneal, riding out the heat cycling that fatigues plain 304.
Process fabricators line vessels, gaskets, and expansion joints with 321 stainless steel foil in plants running above 500 °C. Because titanium ties up carbon before chromium carbide can form, weld zones resist the acid attack that follows carbide precipitation.
Exhaust and engine shops blank SS 321 foil into multi-layer gaskets, heat-shield laminates, and sensor packing. The foil conforms to flange faces under bolt load, and its 40% elongation lets embossed sealing beads form without splitting.
Foil orders leave from our Mumbai and Taloja warehouses within days, packed for domestic transport or export sea freight.
| 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 Foils price in India runs around INR 235 to 450 per kg, roughly USD 2.5-4.7 per kg for export buyers, with thinner gauges and specialty finishes at the upper end of that range. Nickel and ferrochrome benchmarks, width, finish, and volume all move the figure, so call or WhatsApp us for today's rate.
SS 321 foils are available from 0.03 mm to 0.08 mm thick, in any width between 3 mm and 2000 mm. We hold width to ±0.1 mm in-house.
Type 321 stainless steel foil gives oxidation resistance approaching 900 °C and holds creep strength through continuous service in the 425 to 815 °C range. The titanium stabilisation keeps the grade sound across that band.
SS 321 foils carry titanium, which binds carbon into stable carbide and stops chromium carbide from forming at grain boundaries during welding and thermal cycling. That keeps 321 resistant to intergranular corrosion at temperatures where 304 sensitises.
Yes, we precision-slit SS 321 foils in-house to any width from 3 mm to 2000 mm, holding a width tolerance of ±0.1 mm. Slit, mill, deburred, and round edges are all available.
Available finishes include BA (Bright Annealed), 2B, Matte, and Matte PVC. Deburred or round edges suit wrapping and gasket work, where a sharp slit edge would mark the adjacent part.
You can source SS 321 foils in India from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ready foil stock for immediate slitting, and as a manufacturer, supplier, and exporter, we serve buyers across India and overseas. Receive a quote within 24 hours.
