Chemical composition and mechanical properties of 20Cr2Ni4A

**Chemical Composition and Mechanical Properties of 20Cr2Ni4A, Main Applications**

20Cr2Ni4A Material Name: Alloy Structural Steel Grade: 20Cr2Ni4A Features and Application Scope: 20Cr2Ni4A is a high-quality alloy structural steel known for its excellent strength, toughness, and hardenability. It is commonly used in applications requiring high mechanical performance, especially in large components that undergo carburizing. However, after carburizing, it cannot be directly quenched to reduce the residual austenite in the surface layer. The machinability and cold deformation plasticity are moderate, while its weldability is poor, requiring preheating to around 150°C before welding. Additionally, it is prone to white spot sensitivity and has a tendency toward temper brittleness during service. This material is typically used for large carburized parts such as gears, shafts, and quenched and tempered components where high strength and impact resistance are required. Chemical Composition (wt%): - Carbon (C): 0.17–0.23% - Silicon (Si): 0.17–0.37% - Manganese (Mn): 0.30–0.60% - Sulfur (S): ≤0.03% - Phosphorus (P): ≤0.03% - Chromium (Cr): 1.25–1.65% - Nickel (Ni): 3.25–3.65% Mechanical Properties: - Tensile Strength (σb): 1483 MPa - Yield Strength (σ0.2): 1292 MPa - Elongation (δ5): 13% - Reduction of Area (ψ): 57% - Impact Toughness (αkv): 75 J/cm² - Hardness: 434 HB - Specimen Size: Standard sample Heat Treatment Specifications: - Austenitizing temperature: 880°C, oil quenching - Second quenching: 780°C, oil quenching - Tempering: 200°C Microstructure After Heat Treatment: The microstructure consists of tempered martensite, ensuring a balance between hardness and toughness. Notes: Due to its high nickel content, 20Cr2Ni4A is particularly suitable for applications requiring good low-temperature toughness and dimensional stability. It is widely used in the automotive, aerospace, and heavy machinery industries where reliable performance under high stress is essential.

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