We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 409 Sheets & Plates supplier and stockist, established in 2002. We stock titanium-stabilised ferritic flat product to ASTM A240 / ASME SA-240, in thicknesses from 3.8 mm and above and widths up to 2000 mm. Our ISO 9001, 14001, and 45001 certified company holds a supply capacity of 400 to 500 tons monthly, with EN 10204 Type 3.1 / 3.2 mill certificates on request.
Stainless Steel 409 Sheets & Plates are flat-rolled, titanium-stabilised ferritic products containing 10.50% to 11.70% chromium and minimal nickel. Supplied as heavy-gauge plates or light-gauge sheets, they provide cost-effective oxidation resistance and excellent formability for industrial fabrication. As flat products, these Stainless Steel Sheets and Plates suit work where moderate oxidation resistance beats the cost of an austenitic grade. These sheets and plates are typically used in automotive exhaust systems, silencers, catalytic converter shells, and agricultural equipment.
As one of the reliable 409 stainless steel sheet suppliers, we stock this ferritic flat product as ready inventory, sourced from reputed primary mills. Cold rolled sheet arrives in 2B or BA finish from 3.8 mm, while hot-rolled plate is supplied with a No.1 pickled finish. Every order carries EN 10204 Type 3.1 / 3.2 mill certificates upon request, and the grade stays magnetic throughout.
We provide ASTM A240 Type 409 sheets and plates in the annealed mill condition, across three surface finishes and three edge options are available in the dimensions listed below
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 |
| Thickness (Sheets) | 3.8 mm to 6 mm |
| Thickness (Plates) | 6 mm and above |
| Width | 3 mm to 2000 mm |
| Length | Slit to requirement |
| Condition | Annealed (standard mill) |
| Surface Finish | 2B, BA (Bright Annealed), No.1 (HR Pickled) |
| Edge | Mill edge, Slit edge, Deburred edge |
Titanium is what sets Grade 409 apart from a plain 11% chromium steel. Fixed at six times the carbon-plus-nitrogen content, it forms stable carbonitrides and frees chromium to build a protective oxide. ASTM A240 limits for sub-designation 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 |
Formability drives most 409 sheet and plate purchases. Annealed material reaches a 380 MPa minimum tensile strength with 20% elongation, so blanks press, bend, and roll-form without cracking. The grade ships in the annealed condition only, with 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 |
Procurement teams ordering UNS S40900 plate, EN 1.4512 sheet, or SUS 409 material under a local code can match designations through the table below.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S40900 / S40910 |
| Europe (EN) | X2CrTi12 |
| Germany (W.Nr) | 1.4512 |
| Japan (JIS) | SUS 409 / SUS 409L |
| China (GB) | 022Cr11Ti |
| Russia (GOST) | 08Х11Т |
These 3 industries widely utilise the Type 409 flat product we stock. Each values oxidation resistance and clean weldability at a fraction of the cost of a nickel-bearing stainless steel.
Exhaust plants blank and press 409 sheet into catalytic converter housings, muffler bodies, and heat shields. The grade holds up under continuous exhaust temperatures near 675 °C and tolerates spikes towards 815 °C. Titanium stabilisation keeps welded seams ductile, so fabricators skip the post-weld anneal.
Thermal equipment builders type 409 plate into exchanger panels, burner housings, and flue sections. A ferritic structure expands less than austenitic steel when heated, so large fabrications distort less through repeated firing. The relatively low alloy content helps reduce material cost for large welded fabrications.
Farm and general fabricators form 409 stainless plate into grain hoppers, silo walls, chimney liners, and equipment frames. Outdoor atmospheres corrode carbon steel within a season, while the chromium-rich passive oxide film provides improved atmospheric corrosion resistance at a modest cost increase. The material welds readily without the hardening issues associated with some stainless grades, so it replaces costlier flat products wherever chloride exposure stays mild.
Sheet and plate orders issued from our Mumbai and Taloja 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 on request |
The 409 stainless steel sheet price in India averages between ₹120 to ₹185 per kg, equating to roughly $1.3 to $1.9 per kg for international export buyers. This indicative cost range fluctuates based on your required sheet thickness, surface finish, and total order volume. Please call or WhatsApp our sales desk directly to receive today's live, updated commercial rate.
We supply SS 409 sheets from 3.8 mm and plates in widths up to 2000 mm.
Cold rolled sheet comes in 2B or BA (Bright Annealed), and hot rolled plate ships as No.1 pickled. Finish choice depends on gauge.
Both are ferritic, but 409 carries 10.5 to 11.7% chromium with titanium stabilisation for weldability, which suits exhaust work. Grade 430 runs 16 to 18% chromium for stronger corrosion resistance but welds less cleanly.
Yes. Titanium stabilisation ties up carbon and nitrogen, so the weld zone keeps its ductility and resists intergranular attack. Standard TIG and MIG methods work, with no post-weld heat treatment on thin gauges.
Yes. We export worldwide on FOB, CIF, CFR, and EXW terms from Mumbai port. EN 10204 Type 3.1 / 3.2 mill test certificates accompany every export shipment.
You can source SS 409 sheets and plates from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ferritic flat product ready for dispatch, and we serve buyers across India and overseas as a supplier, stockist, and exporter. Phone or WhatsApp us for a quote within 24 hours.
