Technical Specifications
Chemical Composition
- Carbon (C): 0.43–0.48% – Provides medium tensile strength and hardenability.
- Manganese (Mn): 0.75–1.00% – Improves toughness and ductility.
- Silicon (Si): 0.15–0.35% – Adds strength and hardness.
- Nickel (Ni): 0.25% max – Enhances toughness and core strength.
- Chromium (Cr): 0.80–1.10% – Improves hardenability and wear resistance.
- Molybdenum (Mo): 0.15–0.25% – Boosts toughness and elevated temperature performance.
- Phosphorus (P): 0.035% max – Limits brittleness.
- Sulfur (S): 0.040% max – Improves machinability.
Mechanical Properties
- Tensile Strength: 140 ksi (965 MPa)
- Yield Strength: 120 ksi (827 MPa)
- Elongation: 14%
- Reduction of Area: 40%
- Hardness (Rockwell C): 30–36 HRC
- Hardness (Brinell): 286–336 HB
