20XH24A
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Product Description:
20XH24A is a chromium-nickel alloy steel designed for high-performance applications requiring excellent strength, toughness, and resistance to wear. It is commonly used in the aerospace, automotive, and heavy machinery industries. The addition of chromium and nickel enhances its corrosion resistance and mechanical properties, making it suitable for demanding environments.
Chemical Composition:
Element | Composition (%) |
---|---|
Carbon (C) | 0.16–0.22 |
Chromium (Cr) | 2.2–2.6 |
Nickel (Ni) | 1.5–2.0 |
Manganese (Mn) | 0.3–0.6 |
Silicon (Si) | ≤ 0.35 |
Phosphorus (P) | ≤ 0.025 |
Sulfur (S) | ≤ 0.025 |
Iron (Fe) | Balance |
Mechanical Properties:
Property | Value |
---|---|
Yield Strength (σ₀.₂) | ≥ 600 MPa |
Ultimate Tensile Strength (σᵤ) | 900–1100 MPa |
Elongation (δ₅) | ≥ 15% |
Impact Toughness (KCU) | ≥ 50 J/cm² |
Hardness (HB) | 220–280 (after heat treatment) |
Modulus of Elasticity | ~210 GPa |
Physical Properties:
Property | Value |
---|---|
Density | 7.85 g/cm³ |
Thermal Conductivity | ~30 W/m·K |
Specific Heat Capacity | ~460 J/kg·K |
Melting Point | ~1450°C |
Heat Treatment:
- Annealing: Heated to 850–900°C, followed by slow cooling, to soften the steel and improve machinability.
- Quenching: Heated to 950–1000°C, quenched in oil or water, for improved strength and hardness.
- Tempering: Performed at 200–400°C to reduce brittleness and enhance toughness.
- Stress Relieving: Recommended for welded structures at 300–400°C to minimize residual stresses.
Applications:
- Aerospace Industry: Engine components, landing gear, and structural parts.
- Automotive Industry: Gears, shafts, and other drivetrain components.
- Heavy Machinery:High-strength components subject to dynamic loading.
- Oil and Gas: Drill collars, couplings, and other components exposed to wear and stress.
Corrosion Resistance
While 20XH24A provides decent corrosion resistance due to its chromium and nickel content, it is not a specialized corrosion-resistant steel like stainless steel. For enhanced durability in highly corrosive settings, surface treatments or alternative materials (e.g., high-chromium or stainless steel grades) are recommended.