409 Stainless Steel Round Bar (UNS S40900)
409 Stainless Steel Round Bar (UNS S40900) is a titanium-stabilized ferritic stainless steel primarily developed for applications requiring moderate corrosion resistance combined with good formability and cost efficiency. With low nickel content, 409 stainless steel round bars offer excellent resistance to oxidation and high-temperature scaling, making them a preferred choice for automotive exhaust systems and heat-resistant structural components.
Key Features
- UNS Number: S40900
- Ferritic stainless steel with titanium stabilization
- Good oxidation and scaling resistance at elevated temperatures
- Cost-effective alternative to austenitic stainless steels
- Good weldability with proper procedures
- Magnetic in nature
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 409 |
| UNS | S40900 |
| EN | 1.4512 |
| DIN | X2CrTi12 |
| JIS | SUS 409 |
Sizes
- Diameter Range: 5 mm to 300 mm
- Length: 3 m, 6 m, or as per customer requirement
- Cut-to-length sizes available
409 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 10.5 – 11.75 |
| Nickel (Ni) | ≤ 0.50 |
| Titanium (Ti) | ≥ 6 × C |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S40900 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 380 MPa |
| Yield Strength (0.2% Offset) | ≥ 170 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 200 HB |
409 Physical Properties
| Property | Value |
|---|---|
| Density | 7.7 g/cm³ |
| Melting Point | 1425 – 1510°C |
| Thermal Conductivity | 24.9 W/m·K |
| Electrical Resistivity | 0.60 µΩ·m |
| Modulus of Elasticity | 200 GPa |
Types of 409 Stainless Steel Round Bar
- Hot Rolled 409 Round Bar
- Cold Drawn 409 Round Bar
- Bright 409 Round Bar
- Turned and Polished Round Bar
Applications
- Automotive exhaust systems and mufflers
- Heat exchangers and catalytic converters
- Furnace and heat-resistant components
- Structural parts requiring oxidation resistance
- Agricultural and industrial equipment
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