409 Stainless Steel Flat Bar
Stellanox Steel supplies cost-effective and high-performance 409 Stainless Steel Flat Bars, ideal for applications requiring moderate corrosion resistance, high-temperature strength, and excellent formability. As a ferritic stainless steel stabilized with titanium, 409 flat bars are widely used in automotive exhaust systems, heat shields, structural supports, and industrial ducting.
This grade offers a practical balance between performance and price, especially where aesthetics are not a critical concern.
What is 409 Stainless Steel Flat Bar?
409 Stainless Steel Flat Bar is a titanium-stabilized ferritic stainless steel with 10.5–11.75% chromium. Known for its good oxidation and corrosion resistance at elevated temperatures (up to 675°C), 409 flat bar is magnetic and offers excellent weldability. It is commonly used in applications where long-term exposure to heat and moderate corrosion is expected.
Available in annealed or skin-passed conditions, 409 flat bars provide strength, stability, and easy fabrication.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 409 Stainless Steel Flat Bar
- Titanium Stabilized: Enhances weldability and resists intergranular corrosion.
- High-Temperature Performance: Maintains strength and oxidation resistance up to 675°C.
- Moderate Corrosion Resistance: Suitable for automotive and industrial environments.
- Magnetic Structure: Ferritic composition makes it magnetic in all conditions.
- Economical Stainless Option: More affordable than 304 or 316 grades.
- Good Formability and Machinability: Ideal for stamped or bent applications.
Specification Chart – 409 Stainless Steel Flat Bar
| Property | Details |
|---|---|
| Grade | 409 (UNS S40900) |
| Standards | ASTM A240, ASTM A268, EN 10088-2 |
| Thickness Range | 3 mm – 50 mm |
| Width Range | 20 mm – 300 mm |
| Length | Up to 6 meters or custom cut |
| Finish | Dull Gray, 2D, HRAP |
| Condition | Annealed, Skin Passed |
Chemical Composition – 409 Stainless Steel Flat Bar
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 10.5 – 11.75 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.020 |
| Titanium (Ti) | ≥ 6xC min to 0.75 |
| Iron (Fe) | Balance |
Mechanical Properties – 409 Stainless Steel Flat Bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 380 |
| Yield Strength (MPa) | ≥ 170 |
| Elongation (%) | ≥ 20 |
| Hardness (HRB) | ≤ 90 |
| Density | 7.80 g/cm³ |
Equivalent Grades – 409 Stainless Steel Flat Bar
| Standard | Grade |
|---|---|
| ASTM | 409 |
| EN | 1.4512 |
| JIS | SUS 409 |
| UNS | S40900 |
| DIN | X2CrTi12 |
409 Stainless Steel Coil Weight Chart
| Thickness (mm) | Weight per m² (kg) |
|---|---|
| 0.5 | 3.90 |
| 0.8 | 6.24 |
| 1.0 | 7.80 |
| 1.5 | 11.70 |
| 2.0 | 15.60 |
| 2.5 | 19.50 |
| 3.0 | 23.40 |
Applications of 409 Stainless Steel Flat Bar
- Automotive Exhaust Components (Mufflers, Tailpipes, Heat Shields)
- Chimney Liners and Flue Systems
- Furnace Linings and Burners
- HVAC Ductwork and Support Frames
- Welded Tube and Structural Panels
- Agricultural and Equipment Housings
Benefits of 409 Stainless Steel Flat Bar
- Economical stainless solution for high-heat environments
- Resists scaling and corrosion in moderately aggressive conditions
- Magnetic and easily fabricated
- Ideal for automotive and thermal insulation systems
- Weldable without post-treatment in most cases
- Suitable for industrial fabrication and venting applications
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