Stainless steel / UNS S40910
409 is a titanium-stabilised 11% chromium ferritic stainless steel, the economical standard for automotive exhaust systems and other mildly corrosive, moderately hot service.
- UNS S40910
- W.Nr. 1.4512
- Spec ASTM A240 (S40910)
- Density 7.7 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S40910 |
| W.Nr. | 1.4512 |
| EN | X2CrTi12 |
| Also known as | AISI 409, 409L, 1.4512, S40910 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.030 |
| Mn | — | 1.00 |
| P | — | 0.040 |
| S | — | 0.020 |
| Si | — | 1.00 |
| Cr | 10.5 | 11.7 |
| Ni | — | 0.50 |
| N | — | 0.030 |
| Ti | 6×(C+N) | 0.50 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 380 MPa (55.1 ksi) |
| Yield strength, 0.2% offset (min) | 170 MPa (24.7 ksi) |
| Elongation in 50 mm (min) | 20 % |
| Hardness | 179 HB max |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.7 g/cm³ | 0.278 lb/in³ |
| Magnetic response | Magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets, plates & coils | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Seamless & welded pipe | ASTM A312 / ASME SA312 | 1/8" – 24" NB |
| Tubes | ASTM A213, A249, A269 | 1/8" – 24" NB |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 / ASME SA182 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A403 / ASME SA403 | 1/2" – 48" NB |
| Fasteners | ASTM A193 / A194, F593 / F594 | M3 – M56 |
Corrosion & temperature resistance
Corrosion resistance rises with chromium, molybdenum and nitrogen: 304 handles general atmospheric and food-contact service, 316/317 add resistance to chlorides and pitting, 904L handles strong reducing acids, and stabilised 321/347 resist intergranular attack after welding or high-temperature exposure.
Applications
SS 409: Exhaust systems, mufflers, heat-exchanger tubes. Process piping, tanks and vessels, heat exchangers, food, dairy and pharmaceutical equipment, architectural work and general engineering.
Frequently asked questions
What is the UNS number of SS 409?
SS 409 is designated UNS S40910 (W.Nr. 1.4512, EN X2CrTi12).
What is SS 409 used for?
Economical ferritic, oxidation resistant. Typical uses: exhaust systems, mufflers, heat-exchanger tubes.
Is SS 409 magnetic?
Magnetic.
In which forms can I buy SS 409 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dairy Fittings, Dish Ends, SS Tanks, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with SS 409?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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