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Nickel-chromium-molybdenum alloy steel with high tensile strength, excellent toughness, and good fatigue resistance. Offers deep hardenability and maintains strength in large sections, making it suitable for heavily stressed components. Exhibits good wear resistance and impact strength after heat treatment.
Widely used for aircraft components, heavy-duty shafts, gears, bolts, connecting rods, and high-strength engineering parts. Suitable for automotive and aerospace applications requiring high strength and toughness.
| C | Si | Mn | Cr | Mo | Ni | P (Max) | S (Max) |
|---|---|---|---|---|---|---|---|
| 0.38–0.43 | 0.10–0.35 | 0.45–0.70 | 0.90–1.40 | 0.20–0.35 | 1.30–1.70 | 0.035 | 0.035 |
Annealing: 650–700°C, furnace cooling.
Hardening: 830–860°C, oil quenching.
Tempering: 550–650°C depending on required properties.
Provides excellent strength, toughness and fatigue resistance after heat treatment.
Supplied in Annealed, Normalized or Quenched & Tempered condition.
Typical hardness (Q&T): 280–320 HB (approx).
Round: Dia 20 – Dia 500 mm
Flat / Block: 50 – 500 mm
