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20CrMnSi is a type of alloy structural steel specified by the Chinese national standard. It has a unified numerical code of A24202 and follows the GB/T 3077-1988 standard. This steel grade is widely used in engineering applications where high strength, toughness, and good machinability are required.
**Chemical Composition (by weight):**
- Carbon (C): 0.17–0.23%
- Silicon (Si): 0.90–1.20%
- Manganese (Mn): 0.80–1.10%
- Sulfur (S): ≤0.035%
- Phosphorus (P): ≤0.035%
- Chromium (Cr): 0.80–1.10%
- Nickel (Ni): ≤0.030%
- Copper (Cu): ≤0.030%
**Mechanical Properties:**
- Tensile Strength (σb): ≥785 MPa (80 kgf/mm²)
- Yield Strength (σs): ≥635 MPa (65 kgf/mm²)
- Elongation (δ5): ≥12%
- Reduction of Area (ψ): ≥45%
- Impact Work (Akv): ≥55 J
- Impact Toughness (αkv): ≥69 J/cm² (7 kgf·m/cm²)
- Brinell Hardness (HBS 100/3000, annealed or high-temperature tempered): ≤207
**Heat Treatment Specifications:**
- Quenching: 880°C, oil quenching
- Tempering: 480°C, water or oil cooling
- Metallographic Structure: Tempered sorbite + acicular ferrite
**Delivery Condition:**
The material can be delivered in a normalized, annealed, or high-temperature tempered state, or in the as-rolled condition, depending on the contract requirements.
**Key Characteristics:**
20CrMnSi offers excellent strength and toughness, making it suitable for cold deformation processes like cold drawing and rolling. It also exhibits good welding properties and low hardenability. However, it is not typically used for carburizing due to its susceptibility to temper embrittlement. If necessary, it can be used after quenching and tempering.
**Main Applications:**
This steel is commonly used in the production of high-strength welded components, tough parts, sheet metal stampings, cold-drawn, and cold-punched parts with thickness less than 16 mm. It is often found in mining equipment, such as large-section chains, rings, bolts, and other structural components requiring durability and reliability.
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Chemical composition and mechanical properties of 20CrMnSi
20CrMnSi: Chemical Composition, Mechanical Properties, and Main Applications