We are Riddhi Siddhi Impex, a Mumbai-based manufacturer and supplier of Stainless Steel 409 Foils, established in 2002. On our own slitting lines we produce titanium-stabilised ferritic foil to ASTM A240 / ASME SA-240, from 0.03 mm to 0.08 mm. Our ISO 9001, 14001, and 45001-certified company holds ready stock; we hold 400 to 500 tons of monthly supply capacity, and ship with EN 10204 Type 3.1 / 3.2 certificates on request.
Stainless Steel 409 foil is a thin-gauge ferritic chromium stainless steel stabilised with titanium and carrying 10.5 to 11.7% chromium. The titanium locks up carbon and nitrogen as carbonitrides, so welded zones keep their ductility without post-weld annealing. With almost no nickel, these stainless steel foils are the most economical stainless grade, magnetic in every condition, and chosen where oxidation resistance at moderate heat matters more than raw strength. Stainless Steel 409 foil finds typical use in automotive heat shields, flexible exhaust couplings, spacer gaskets, and industrial silencer wraps.
As a reliable 409 Stainless Steel foil supplier, every 409 foil that is issued from our plant is cold-rolled and slit in-house from stainless steel coil rather than resold as mill width. Material ships in the annealed soft condition to ASTM A240 in any width from 3 mm to 2000 mm at thicknesses reaching the ultra-thin gauge range. Buyers pick 2B, BA, or matte finishes with slit, deburred, or round edges.
We provide ASTM A240 Type 409 Foil in the annealed soft condition, precision slit to your exact width from ready stock, with the finish, edge, and coil options set out below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 0.08 mm |
| Width | 3 mm to 2000 mm (custom slit) |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Surface Finish | 2B, BA (Bright Annealed), Matte |
| Edge | Slit edge, Deburred edge, Round edge, Mill edge |
| Supply form | Cold rolled |
Titanium is the element that defines this grade. Added at six times the combined carbon and nitrogen, it forms carbonitrides that keep chromium free to build the passive film.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulphur (S) | 0.020 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 10.50 to 11.70 |
| Nickel (Ni) | 0.50 max |
| Titanium (Ti) | 6x(C+N) min to 0.50 max |
| Niobium (Nb) | 0.17 max |
| Nitrogen (N) | 0.030 max |
| Iron (Fe) | Balance |
Elongation is what makes AISI 409 Stainless Steel Foil attractive to press shops. Annealed material reaches a minimum tensile strength of 380 MPa with 20% elongation, so it draws and folds without splitting. Foil ships soft only; 409 carries no hardness temper ladder. Below the standard's thin-gauge testing threshold, treat the values as indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
380 MPa (55 ksi) |
|
Yield Strength (0.2% offset), minimum
|
170 MPa (25 ksi) |
|
Elongation in 50 mm, minimum
|
20% |
|
Hardness, maximum
|
88 HRB |
International buyers can cross-reference UNS S40900 Foil against their regional code below. Our foil matches every designation listed for this ferritic chromium-titanium alloy.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S40900 |
| Europe (EN Name) | X2CrTi12 |
| Germany (W.Nr) | 1.4512 |
| Japan (JIS) | SUS409 |
| China (GB) | 022Cr11Ti |
These 3 industries widely use the 409 Foil issued from our slitting lines. Each selects the grade for oxidation resistance and clean weldability at a fraction of the austenitic cost.
Exhaust makers use SS 409 foil for catalytic converter shells and housings, muffler wraps, heat shields, and flexible-joint layers. The grade handles continuous exhaust-gas temperatures around 675 °C, with intermittent excursions towards 815 °C, and titanium stabilisation keeps welded seams sound.
Heat-shield fabricators press 409 foil into engine bay barriers, turbo blankets, and firewall linings. Ferritic steel expands roughly a third less than austenitic grades on heating, so shields cycle between hot and cold with little distortion. Reflective thin-gauge foil blocks radiant heat at minimal weight.
Equipment builders form 409 foil into grain-dryer panels, silo linings, and general fabricated parts where a corrosion-resistant surface is needed at modest cost. The 20% minimum elongation gives room for deep forming, and the grade resists rural atmospheric exposure better than plain carbon steel.
Export orders issued from our Mumbai and Taloja warehouses, packed in wooden cases or on pallets for 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 409 Foils price in India runs around ₹160 to ₹240 per kg, roughly $1.8 to $2.6 per kg for export buyers. As a nickel-free ferritic grade, 409 SS Foils cost far less than austenitic foil. The range is indicative; thickness, width, finish, and volume all move it. Send us your size and grade requirement for a prompt quotation.
SS 409 foils is from 0.03 mm to 0.08 mm thick, in any width between 3 mm and 2000 mm. We slit width in-house to ±0.1 mm.
Yes, 409 foil welds well. The titanium stabilisation ties up carbon and nitrogen, so the weld zone keeps its ductility and resists intergranular corrosion. TIG welding with a 409 or 409Cb filler suits thin gauges.
Grade 409 gives continuous oxidation resistance to about 675 °C, with intermittent excursions towards 815 °C in air. That range covers automotive exhaust and moderate-temperature heat shielding.
409L (UNS S40910) carries lower carbon than plain 409, which improves weldability and reduces the risk of sensitisation. Both are ferritic titanium-stabilised grades with matching corrosion and oxidation resistance.
We supply SS 409 foils in 2B, BA, and matte finishes, with slit, deburred, or round edge conditions to suit gasket, winding, and forming work.
You can source SS 409 foils in India from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ready ferritic foil stock, and we will provide quotes within 24 hours.
