409 stainless steel (UNS S40900) is a stabilized ferritic stainless steel containing 10.5–11.75% chromium and a small amount of titanium. It is the most widely used stainless steel in automotive exhaust systems due to its excellent resistance to high-temperature oxidation and condensate corrosion. 409 offers a cost-effective alternative to austenitic grades like 304 for applications where high strength and moderate corrosion resistance are required. It is designated as 022Cr11Ti (GB/T, China) and 1.4512 (EN, Europe).
Chemical Composition
Typical chemical composition (% by mass) per ASTM A240 / EN 10088.
| Grade | C (%) | Cr (%) | Ni (%) | Ti (%) | Type |
|---|---|---|---|---|---|
| 409 / S40900 | ≤0.08 | 10.5–11.75 | ≤0.50 | ≥6×C (Stabilized) | Ferritic |
Note: Titanium (Ti) is added to stabilize the structure, preventing the formation of chromium carbides during high-temperature exposure and improving weldability.
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 409 | ≥205 | ≥380 | ≥20 | ≤207 |
Available Sizes & Delivery
| Thickness (Plate/Sheet) | 0.3–50 mm |
| Width | 1000–2000 mm |
| Forms Available | Coil, plate, sheet, strip |
| Standard | ASTM A240 / EN 10088 |
| Mill Test Certificate | EN 10204 3.1 with every shipment |
| MOQ | 3 Tons |
| Delivery Time | Within 7-10 days (≤500 tons) |
Why Order from Zhongtang Steel?
- Cost-Effective — One of the most economical stainless steel grades
- High-Temperature Oxidation Resistance — Ideal for automotive exhaust systems
- EN 10204 3.1 MTC supplied with every shipment
- ISO 9001 certified manufacturer since 1998
- Mill-direct pricing — no trading company markup
Applications
- Automotive exhaust systems — mufflers, tailpipes, catalytic converters
- Heat exchangers and industrial furnaces
- Agricultural equipment and silos
- Railway passenger car components
- General structural components requiring moderate corrosion resistance
