309 Stainless Steel Round Bar (UNS S30900)
309 Stainless Steel Round Bar (UNS S30900) is a high-alloy austenitic stainless steel designed for high-temperature and oxidation-resistant applications. With elevated chromium and nickel content compared to 304 and 310 grades, 309 round bars offer excellent resistance to scaling, thermal fatigue, and corrosive environments at elevated temperatures, making them ideal for furnace and heat-treatment industries.
Key Features
- Excellent oxidation and scaling resistance up to high temperatures
- High chromium (22–24%) and nickel (12–15%) content
- Good strength retention at elevated temperatures
- Superior resistance to sulfidation and carburization
- Good weldability and fabrication characteristics
- Non-magnetic in annealed condition
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 309 |
| UNS | S30900 |
| EN | 1.4828 |
| DIN | X15CrNiSi25-20 |
| JIS | SUS 309 |
Sizes
| Diameter Range | Length |
|---|---|
| 3 mm – 500 mm | Random / Cut Length / Up to 6 meters |
| Custom Sizes | Available on request |
309 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Chromium (Cr) | 22.00 – 24.00 |
| Nickel (Ni) | 12.00 – 15.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S30900 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
309 Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Range | 1399 – 1454°C |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 309 Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Polished Stainless Steel Round Bar
- Forged Round Bar
Applications
- Furnace parts and heat-treatment equipment
- Petrochemical and refinery components
- Kilns, burners, and combustion chambers
- Heat exchangers and boiler parts
- Power generation and thermal processing units
- High-temperature structural components
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