409 Stainless Steel Pipe
Stellanox Steel supplies high-quality 409 Stainless Steel Pipes, specifically engineered for automotive exhaust systems, fuel lines, and high-temperature applications where oxidation resistance and affordability are key. As a ferritic stainless steel with high heat resistance and moderate corrosion protection, 409 is ideal for systems exposed to exhaust gases, thermal cycling, and mild atmospheric conditions.
Its combination of cost-effectiveness, formability, and durability makes 409 stainless steel pipe a widely preferred material for OEMs and manufacturers across automotive, construction, and industrial sectors.
What is 409 Stainless Steel Pipe?
409 Stainless Steel Pipe is a ferritic stainless steel alloy primarily made of 11–12% chromium, offering good oxidation and corrosion resistance at high temperatures. Designed to replace carbon steel in mildly corrosive applications, 409 is magnetic and known for its weldability, formability, and resistance to scaling in elevated temperature conditions.
The pipe is often used in exhaust manifolds, mufflers, catalytic converter tubes, and other systems where corrosion resistance is important but not as critical as in chloride-rich environments.
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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 Pipe
- High Heat Resistance: Suitable for continuous operation in high-temperature exhaust systems.
- Excellent Weldability: Easy to fabricate and join using standard techniques.
- Moderate Corrosion Resistance: Better than carbon steel, suitable for atmospheric and exhaust conditions.
- Magnetic Ferritic Structure: Strong and dimensionally stable during processing.
- Cost-Effective: Lower cost alternative to 304/316 stainless steel.
- Good Formability: Can be bent, flared, or shaped for custom fabrication.
Specification Chart – 409 Stainless Steel Pipe
| Property | Details |
|---|---|
| Grade | 409 (UNS S40900) |
| Standard | ASTM A268, A554, A249 |
| Pipe Types | Seamless, ERW, Welded |
| Size Range | 1/2" to 24" NB (custom OD sizes available) |
| Wall Thickness | SCH 5 to SCH 80 |
| Length | 6m, 12m, custom cut |
| Surface Finish | Mill Finish, Bright Annealed, Polished |
| End Types | Plain End (PE), Beveled End (BE), Threaded End |
| Certifications | EN 10204 3.1, ISO, IBR, PED |
Chemical Composition – 409 Stainless Steel Pipe
| Element | Symbol | Composition (%) |
|---|---|---|
| Chromium | Cr | 10.5 – 11.75 |
| Carbon | C | ≤ 0.08 |
| Manganese | Mn | ≤ 1.0 |
| Silicon | Si | ≤ 1.0 |
| Phosphorus | P | ≤ 0.045 |
| Sulfur | S | ≤ 0.030 |
| Nitrogen | N | ≤ 0.030 |
| Iron | Fe | Balance |
Mechanical Properties – 409 Stainless Steel Pipe (Annealed)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 380 |
| Yield Strength (MPa) | ≥ 170 |
| Elongation (%) | ≥ 20 |
| Hardness (HRB) | ≤ 89 |
| Density | 7.75 g/cm³ |
| Max Operating Temp | Up to 675°C (continuous) |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 409 |
| UNS | S40900 |
| EN | 1.4512 |
| JIS | SUS 409 |
| DIN | X6CrTi12 |
409 Stainless Steel Pipe Weight Chart
| OD (mm) | Wall Thickness (mm) | Weight per Meter (kg) | Weight per 6m (kg) |
|---|---|---|---|
| 25.4 | 1.2 | 0.74 | 4.44 |
| 38.1 | 1.5 | 1.45 | 8.70 |
| 50.8 | 2.0 | 2.55 | 15.30 |
| 63.5 | 2.5 | 4.00 | 24.00 |
| 76.2 | 3.0 | 5.80 | 34.80 |
| 88.9 | 3.0 | 6.80 | 40.80 |
| 101.6 | 3.5 | 8.75 | 52.50 |
| 114.3 | 4.0 | 11.20 | 67.20 |
Applications of 409 Stainless Steel Pipe
- Automotive exhaust systems
- Muffler and catalytic converter tubing
- Tailpipes and manifolds
- Heat exchanger tubing
- Structural supports exposed to thermal cycling
- Ventilation and ductwork in industrial environments
- General fabrication where corrosion resistance is moderate
Benefits of 409 Stainless Steel Pipe
- Withstands high exhaust and heat loads
- Cost-efficient for large volume fabrication
- Better corrosion resistance than carbon steel
- Excellent weldability and formability
- Suitable for both indoor and outdoor installations
- Maintains mechanical strength at elevated temperatures
2025 Stellanox Steel |