General Properties
Alloy 310H (UNS S31009) has a carbon content restricted to exclude the lower end of the 310 range. This makes 310H the grade of choice for high temperature applications. This steel has good resistance to oxidation at temperatures of up to 1040°C (1904°F) in intermittent service and 1150°C (2102°F) in continuous service. It is widely used in environments where sulfur dioxide gas is present at high temperatures; however it is recommended that this steel should not be continuously used at 425-860°C (797-1580°F) range due to carbide precipitation.
Chemical Composition
| Element | Content (%) |
Iron, Fe | 49.075-45.865 |
Chromium, Cr | 24-26 |
Nickel, Ni | 19-22 |
Manganese, Mn | 2 |
Silicon, Si | 0.75 |
Phosphorous, P | 0.045 |
Carbon, C | 0.040-0.10 |
Sulfur, S | 0.03 |
| Properties | Metric | Imperial |
Tensile strength | 515 MPa | 74694 psi |
Yield strength | 205 MPa | 29732 psi |
Modulus of elasticity | 200 GPa | 29000 ksi |
Shear modulus | 77.0 GPa | 11200 ksi |
Poissons ratio | 0.3 | 0.3 |
Elongation at break (in 50 mm) | 40% | 40% |
Hardness, Rockwell B | 95 | 95 |
Hardness, Brinell | 217 | 217 |
PHYSICAL PROPERTIES
| Quantity | Value | Unit |
Thermal expansion | 16 – 17 | e-6/K |
Thermal conductivity | 16 – 16 | W/m.K |
Specific heat | 500 – 500 | J/kg.K |
Melting temperature | 1370 – 1400 | °C |
Service temperature | 0 – 500 | °C |
Density | 8000 – 8000 | kg/m3 |
Resistivity | 0.7 – 0.7 | Ohm.mm2/m |
