Steel 1018
Steel 1018 – Low-Carbon Mild Steel for General Machining and Case Hardening
Steel 1018 is the most commonly specified low-carbon mild steel, offering an excellent balance of machinability, weldability, and ductility at low cost. With 0.18% carbon content it is readily case-hardenable via carburizing or carbonitriding, making it ideal for shafts, pins, and bushings where a hard wear surface over a tough core is required.
Key Properties
- Tensile Strength: 440 MPa
- Yield Strength: 370 MPa
- Elongation: 15%
- Hardness: 126 HB
- Carbon Content: ~0.18%
- Weldability / Machinability: Excellent / Excellent
Common Applications
Shafts, pins, keys, bushings, spacers, bolts, rods, and general structural machined components. Excellent candidate for case-hardened wear surfaces. Compliant with ASTM A108.
Material properties
| Material name | Steel 1018 |
|---|---|
| Type | Carbon & Alloy Steel |
| Standard code | ASTM A108 |
| Tensile strength (MPa) | 440 |
| Yield strength (MPa) | 370 |
| Fatigue strength (MPa) | 250 |
| Elongation (%) | 15 |
| Hardness (Brinell) | 126 |
| Density (g/cm³) | 7.87 |
| Electrical resistivity (µΩ·in) | 10 |
| Thermal conductivity (W/m·K) | 51.9 |
| Melting range (°C) | 1490–1527 |
| Weldability | Excellent |
| Formability | Excellent |
| Shear modulus | 80 |
| Industry code | carbon_1018 |