We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 409 Coils supplier and stockist, established in 2002. Our warehouse holds titanium-stabilised ferritic coil stock to ASTM A240 / ASME SA-240, from 0.03 mm to 5 mm thick. As an ISO 9001, 14001, and 45001 certified company, we hold a supply capacity of 400 to 500 tons monthly, with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 409 coils are flat-rolled ferritic stainless steel carrying 10.50 to 11.70% chromium with a titanium addition that binds carbon and nitrogen. Welded seams hold their corrosion resistance without post-weld annealing. These stainless steel coils contain very little nickel, making them more economical than austenitic stainless steel coils, and they stay magnetic in every condition. Stainless Steel 409 coils are typically used in automotive exhaust systems, mufflers, catalytic converter housings, and agricultural machinery components.
As a reliable stainless steel 409 coils supplier, we keep these coils as ready stock, sourced from reputed primary mills and slit in-house to any width up to 2000 mm. Material ships in the annealed soft condition per ASTM A240, as HR (hot rolled) pickled or CR (cold rolled) supply.
We provide ASTM A240 Type 409 Stainless Steel Coils in the annealed condition, hot rolled or cold rolled, slit from ready stock to the dimensions below.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Coil ID | 150 mm to 610 mm |
| Coil OD | Up to 1800 mm |
| Condition | Annealed (standard mill) |
| Surface Finish | 2B, BA (Bright Annealed), Matte, Scotch-Brite, No.1 finish (HR pickled) |
| Supply Forms | Hot rolled and Cold rolled |
| Edge | Mill edge, Slit edge |
Titanium separates Grade 409 from plain chromium steels. It ties up carbon and nitrogen as carbonitrides, leaving chromium free to guard the surface. ASTM A240 limits for S40910 follow.
| 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 |
Annealed 409 SS Coils pair a 380 MPa minimum tensile strength with 20% elongation, so blanks draw and roll-form cleanly. Coils ship soft only; the grade carries no temper ladder.
| 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 |
Buyers ordering UNS S40900 coils, EN 1.4512 material, or SUS409 stock under a regional code can match designations in the table below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S40900 / S40910 |
| Europe (EN) | X2CrTi12 |
| Germany (W.Nr) | 1.4512 |
| Japan (JIS) | SUH409 / SUS409L |
| China (GB) | 022Cr11Ti |
These 4 industries utilise most of the AISI 409 coils in our stock. Each values oxidation resistance at a fraction of the cost of austenitic grades.
Exhaust plants roll-form 409 coil stock into catalytic converter shells, muffler bodies, and tailpipes. The grade runs at continuous exhaust temperatures around 675 °C and tolerates intermittent spikes towards 815 °C. Titanium stabilisation keeps seam welds ductile, so production lines skip post-weld annealing.
Thermal equipment builders press Type 409 coil into exchanger panels, burner housings, and flue components. Its ferritic structure has a lower coefficient of thermal expansion than austenitic stainless steels, reducing distortion during repeated heating cycles.
Farm machinery makers form 409 SS coil into grain dryers, silo panels, hoppers, and sprayer bodies. Rural atmospheres corrode carbon steel more rapidly; a chromium oxide surface lasts for years at little extra cost. The 20% minimum elongation leaves room for deep pressing.
Fabrication shops slit 409 stainless coils into chimney liners, stove components, and welded structural tubes. The material joins without hardening trouble and accepts paint or aluminising well. Where chloride exposure stays mild, it replaces costlier grades with no service penalty.
Coil orders leave from Mumbai and Taloja warehouses within days, packed for road 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 mill test certificates on request |
Stainless Steel 409 Coils price in India is around ₹120-₹180 per kg, roughly $1.4-$2.1 per kg for export buyers. The range is indicative. Ferrochrome rates, thickness, finish, and order volume all move the figure, so call or WhatsApp our team for today's rate.
We supply SS 409 Coils in thicknesses from 0.03 mm to 5 mm and widths up to 2000 mm, with coil ID from 150 mm to 610 mm and OD up to 1800 mm. Custom widths are slit in-house at ±0.1 mm.
The difference between SS 409 and SS 410 Coils lies in microstructure and heat-treat response. Grade 409 is a titanium-stabilised ferritic steel made for welded exhaust work, while 410 is martensitic and hardens by quenching and tempering.
409 stainless coils are used in automotive exhausts because they resist hot exhaust gas at around 675 °C continuous service for a fraction of the austenitic cost. Welded seams stay ductile thanks to titanium stabilisation.
Yes, we provide mill test certificates for SS 409 Coils on request. EN 10204 Type 3.1 / 3.2 documents are issued with every order on request.
The price of SS 409 Coils sits near ₹120-₹180 per kg in India, about $1.4-$2.1 per kg for export. Send your thickness, width, and quantity for a firm quotation.
You can source Stainless Steel 409 Coils in India from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ferritic coil stock ready for dispatch, and we serve buyers across India and overseas as a supplier, stockist, and exporter. Phone or WhatsApp us; quotes will be provided within 24 hours.
