We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 441 Foils manufacturer and supplier, established in 2002. Our own slitting lines convert this dual-stabilised ferritic grade into foil from 0.03 mm to 0.08 mm under ASTM A240 / ASME SA-240. With ISO 9001, 14001, and 45001 certifications, we keep a ready stock and provide EN 10204 Type 3.1 / 3.2 certificates on request.
Stainless Steel 441 foil is a thin-gauge ferritic stainless steel holding around 18% chromium, stabilised twice over with titanium and niobium. Both additions bind carbon and nitrogen, so welded joints keep their corrosion resistance with no post-weld anneal. Mills developed the grade for automotive exhaust hot ends, where it resists scaling to roughly 950 °C in cyclic service. The metal is ferromagnetic, doesn't respond to hardening heat treatment, and has a density of 7.7 g/cm³.
Every metre of stainless steel foil we sell as a stainless steel 441 foil supplier and manufacturer gets dispatched from our own slitting lines. Supply condition is annealed soft only, since 441 carries no hardness temper ladder. Buyers pick any width from 3 mm to 2000 mm, with BA, 2B, matte PVC, and matte surfaces.
We provide AISI 441 Foil to ASTM A240 in the annealed soft condition, custom slit from ready stock, with the finishes, edges, and coil dimensions listed 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 | BA (Bright Annealed), 2B, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
Niobium separates Grade 441 Foil from single-stabilised ferritics. Paired with titanium, it pins carbon at grain boundaries and raises hot strength. ASTM A240 limits for UNS S44100 appear below.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.50 to 19.50 |
| Nickel (Ni) | 1.00 max |
| Titanium (Ti) | 0.10 to 0.50 |
| Niobium (Nb) | 0.3 + 3x(C) min to 1.00 max |
| Nitrogen (N) | 0.030 max |
| Iron (Fe) | Balance |
Press shops order Type 441 Stainless Steel Foil for its balance of strength and formability. Annealed material pairs a 415 MPa minimum tensile strength with 22% elongation, so it stamps and folds without cracking. Below 0.38 mm gauge, treat elongation as indicative.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
415 MPa (60 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Elongation in 50 mm, minimum
|
22% |
|
Hardness, maximum
|
89 HRB |
Overseas buyers can cross-check UNS S44100 Foil against the designations below. JIS carries no direct match for this grade; Japanese enquiries order against EN 1.4509 Foil.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S44100 |
| USA (AISI) | Type 441 |
| Europe (EN Name) | X2CrTiNb18 |
| Germany (W.Nr) | 1.4509 |
These 4 industries use most of the Alloy 441 Foil, leaving our slitting lines. Each one selects the grade for weldable stabilised chemistry and scaling resistance near 950 °C at ferritic cost.
Exhaust system builders wind Alloy 441 Foil into flexible coupling liners, heat shields, and manifold wraps. Hot-end duty is what the chemistry was built for: the foil cycles to roughly 950 °C without heavy scaling, and its thermal expansion is about a third below austenitic grades, so clamped joints stay tight.
Appliance manufacturers utilise SS 441 foil in oven liners, flue components, and hob trim. A bright annealed surface forms without orange peel at shallow draws. Because the grade contains no deliberate nickel, part costs stay flat when nickel prices swing, which matters on high-volume white goods lines.
Thin-gauge 441 stainless foil is used in heat exchanger fins and the winding strip of spiral-wound gaskets. Corrugating demands ductility, and the 22% minimum elongation provides it. In recuperators running hot exhaust against fresh air, the grade's oxidation resistance keeps fin edges intact at a cost austenitic foil cannot meet.
Sensor and instrumentation firms draw 441 SS foil into exhaust gas sensor housings, thermocouple sheaths, and shielding cans near the manifold. The material welds predictably, stays magnetic for position sensing, and tolerates under-bonnet heat that unstabilised ferritic foil handles poorly. Slitting to ±0.1 mm gives presses a consistent blank.
Consignments move from Taloja and Mumbai in wooden cases or on pallets, documented for export.
| 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 441 Foils price in India is around ₹200-₹300 per kg, close to $2.30-$3.55 per kg for export buyers. Treat the band as indicative; gauge, width, finish, and order volume all move the figure. Send your requirement for a firm quotation today.
We slit SS 441 foils from 0.03 mm to 0.08 mm, in widths anywhere between 3 mm and 2000 mm, with width dimensions held to ±0.1 mm.
SS 441 carries titanium and niobium as stabilisers, while SS 430 carries neither, so 441 Stainless Foil resists intergranular corrosion after welding and holds strength further up the temperature scale.
Yes, 441 foil welds cleanly. The two stabilising elements lock up carbon and nitrogen, so the heat-affected zone stays ductile and corrosion resistant with no post-weld anneal.
In dry heat and exhaust-type service, 441 stainless foil replaces 304 at a lower cost because it's nickel-free. It gives up some ductility and toughness, so severe deep-draw work still favours the austenitic grade.
SS441 foil resists scaling to roughly 950 °C in cyclic, exhaust-type service, which is why the grade dominates hot-end exhaust work.
You can source SS 441 foils in India directly from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ferritic foil stock, and get a quote 24 hours.
