EngiRef / Carbon Steel Properties
AISI 4140 Alloy Steel
AISI 4140 Alloy Steel (AISI 4140): carbon steel engineering material. Density 7850 kg/m³. Yield 655 MPa, ultimate 1020 MPa. Elastic modulus 205 GPa.
carbon-steel
Specification
- Name
- AISI 4140 Alloy Steel
- Category
- carbon-steel
- Designation
- AISI 4140
- Applications
- Gears, Shafts, Spindles, Fixtures, Tooling, Crankshafts
- Notes
- Chrome-moly alloy. High strength when heat treated. Good fatigue resistance. Strength values are for the NORMALIZED condition (870 °C) — annealed is weaker and quenched and tempered is stronger.
Properties
| Property | Value |
|---|---|
| Density | 7850 kg/m³ |
| Tensile Strength Yield | 655 MPa |
| Tensile Strength Ultimate | 1020 MPa |
| Elastic Modulus | 205 GPa |
| Shear Modulus | 80 GPa |
| Poissons Ratio | 0.29 |
| Thermal Conductivity | 42.6 W/(m·K) |
| Thermal Expansion | 12.3 µm/(m·K) |
| Specific Heat | 473 J/(kg·K) |
| Melting Point | 1416 °C |
| Hardness | Brinell: 302, Rockwell C: C32 |