Spring Steel
Spring Steel (1074 / 1095 / 5160) – High-Carbon Steel Optimized for Cyclic Fatigue Resistance
Spring steels are high-carbon or silicon-manganese alloy steels specifically processed and heat-treated to achieve the maximum possible elastic limit and fatigue life under cyclic loading. Typically supplied in the pre-hardened and tempered condition, they deliver the elastic energy storage and release performance required for springs, clips, and flexible blades without taking a permanent set under load.
Key Properties
- Tensile Strength: 1200 MPa (hardened)
- Yield Strength: 1000 MPa
- Hardness: 375 HB
- Fatigue Life: Optimized for high-cycle applications
- Weldability: Poor — typically used in pre-hardened form
- Standards: ASTM A684 / SAE 1095
Common Grades and Applications
1074/1075 for flat springs and lock washers; 1095 for high-stress flat springs and cutting blades; 5160 Cr-V for automotive leaf springs and heavy coil springs requiring high toughness at elevated hardness.
Material properties
| Material name | Spring Steel |
|---|---|
| Type | Other Metals |
| Standard code | ASTM A684 / SAE 1095 |
| Tensile strength (MPa) | 1200 |
| Yield strength (MPa) | 1000 |
| Fatigue strength (MPa) | 700 |
| Elongation (%) | 8 |
| Hardness (Brinell) | 375 |
| Density (g/cm³) | 7.85 |
| Electrical resistivity (µΩ·in) | 18 |
| Thermal conductivity (W/m·K) | 46.6 |
| Melting range (°C) | 1427–1510 |
| Weldability | Poor |
| Formability | Fair |
| Shear modulus | 79 |
| Industry code | spring_steel |