310H Stainless Steel Round Bar (UNS S31009)
310H Stainless Steel Round Bar (UNS S31009) is the high-carbon variant of Grade 310 stainless steel, specifically engineered for high-temperature strength, creep resistance, and oxidation resistance. The increased carbon content enhances tensile and creep properties at elevated temperatures, making 310H round bars ideal for continuous service in furnaces, petrochemical plants, and thermal processing equipment.
Key Features
- High carbon content for superior creep and high-temperature strength
- Exceptional oxidation and scaling resistance
- Excellent performance in continuous and cyclic high-temperature service
- High chromium and nickel content ensures thermal stability
- Good resistance to carburization and sulfidation
- Best suited for non-welded or controlled welding applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 310H |
| UNS | S31009 |
| EN | 1.4919 |
| DIN | X15CrNiSi25-21 |
| JIS | SUS 310H |
Sizes
| Diameter Range | Length |
|---|---|
| 6 mm – 500 mm | Random / Cut Length / Up to 6 meters |
| Custom Sizes | Available on request |
310H Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Chromium (Cr) | 24.00 – 26.00 |
| Nickel (Ni) | 19.00 – 22.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S31009 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 223 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.9 g/cm³ |
| Melting Range | 1400 – 1455°C |
| Thermal Conductivity | 14.2 W/m·K |
| Electrical Resistivity | 0.78 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 310H Stainless Steel Round Bar
- Hot Rolled Round Bar
- Annealed Round Bar
- Turned Round Bar
- Forged Stainless Steel Round Bar
Applications
- Furnace parts and high-temperature components
- Petrochemical and refinery 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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