Applications
- Shafts, crankshafts, and connecting rods in heavy machinery and aeronautics.
- High-strength structural components in the automotive and aerospace industries.
- Gears, sprockets, and transmission components subjected to high loads.
- High-performance bolts and fasteners.
- Parts subjected to cyclic stresses and dynamic loads.
Characteristics:
- Alloy steel with nickel, chromium, and molybdenum.
- High mechanical strength and hardness.
- Good toughness and impact resistance.
- Excellent hardenability through heat treatment.
- Good fatigue and tensile strength.
- Moderate weldability, requires preheating and post-treatment.
Chemical Composition
| Variant | %(C) Carbono | %(Mn) Manganeso | %(P) Fósforo | %(S) Azufre | %(Si) Silicio | %(Ni) Níquel | %(Cr) Cromo | %(Mo) Molibdeno |
|---|---|---|---|---|---|---|---|---|
| 4340 (Round) | 0.38% - 0.43% | 0.60% - 0.80% | 0.035% Máximo | 0.040% Máximo | 0.15% - 0.35% | 1.65% - 2.00% | 0.70% - 0.90% | 0.20% - 0.30% |