309H Stainless Steel Round Bar (UNS S30909)
309H Stainless Steel Round Bar (UNS S30909) is a high-carbon version of Grade 309 stainless steel, specially designed for high-temperature and high-strength applications. The increased carbon content improves creep resistance and tensile strength at elevated temperatures, making 309H round bars ideal for furnace, refinery, and thermal processing equipment where long-term heat exposure is critical.
Key Features
- High carbon content for improved creep and tensile strength
- Excellent oxidation and scaling resistance at elevated temperatures
- Superior performance in continuous and cyclic high-temperature service
- High chromium and nickel content for thermal stability
- Good resistance to sulfidation and carburization
- Suitable for non-welded or controlled welding applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 309H |
| UNS | S30909 |
| EN | 1.4910 |
| DIN | X15CrNiSi25-21 |
| JIS | SUS 309H |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 500 mm | Random / Cut Length / Up to 6 meters |
| Custom Sizes | Available on request |
309H Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| 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 |
Mechanical Properties of 309H Round Bar
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 223 HB |
UNS S30909 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 309H Stainless Steel Round Bar
- Hot Rolled Round Bar
- Annealed Round Bar
- Turned Round Bar
- Forged Stainless Steel Round Bar
Applications
- Furnace components and heat-resistant parts
- Refinery and petrochemical processing equipment
- Heat exchangers and high-temperature piping supports
- Power plant boilers and thermal units
- Kilns, burners, and incineration systems
- High-temperature structural and pressure components
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