EngiRef / Carbon Steel Properties
AISI 4340 Alloy Steel
AISI 4340 Alloy Steel (AISI 4340): carbon steel engineering material. Density 7850 kg/m³. Yield 862 MPa, ultimate 1110 MPa. Elastic modulus 205 GPa.
carbon-steel
Specification
- Name
- AISI 4340 Alloy Steel
- Category
- carbon-steel
- Designation
- AISI 4340
- Applications
- Aircraft landing gear, Power transmission gears, Shafts
- Notes
- Ni-Cr-Mo alloy. Very high strength. Excellent toughness and fatigue resistance.
Properties
| Property | Value |
|---|---|
| Density | 7850 kg/m³ |
| Tensile Strength Yield | 862 MPa |
| Tensile Strength Ultimate | 1110 MPa |
| Elastic Modulus | 205 GPa |
| Shear Modulus | 80 GPa |
| Poissons Ratio | 0.29 |
| Thermal Conductivity | 44.5 W/(m·K) |
| Thermal Expansion | 12.3 µm/(m·K) |
| Specific Heat | 475 J/(kg·K) |
| Melting Point | 1427 °C |
| Hardness | Brinell: 321, Rockwell C: C35 |