Technical Specifications
Chemical Composition
- Carbon (C): 0.90-1.05% – High carbon content contributes to strong carbide network and excellent wear resistance.
- Manganese (Mn): 1.00-1.20% – Enhances strength and hardenability.
- Silicon (Si): 0.15-0.35% – Supports strength and machinability.
- Chromium (Cr): 0.50-0.70% – Provides improved hardenability and resistance to wear.
- Tungsten (W): 0.50-0.70% – Contributes to hardness retention and carbide formation.
- Vanadium (V): 0.05-0.15% – Refines grain structure and improves toughness.
- Phosphorus (P): ≤ 0.03% – Limits brittleness.
- Sulfur (S): ≤ 0.03% – Maintains good machinability.
Treatment
- Annealing: Heat to approx. 750-780 °C, hold to equalise temperature, then furnace-cool slowly to circa 600 °C to achieve ≤ 229 HB for machining readiness.
- Hardening: Pre-heat to ~650 °C, then austenitise at ~780-820 °C for full transformation, followed by oil quench (or suitable medium) depending on section size.
- Tempering: Immediately temper after quench; typical tempering temperature 150-250 °C to achieve hardness between ~57-62 HRC depending on section size.
- Finishing Machining & Polishing: Excellent dimensional stability during heat treatment allows precision tooling with minimal distortion and good surface finish.
