Applications of GB 3077 20SiMn2MoV Steel
GB 3077 20SiMn2MoV steel is a high-strength, high-toughness alloy structural steel compliant with Chinese national standards. It is widely used in the manufacturing of mechanical components that must withstand high loads, complex stresses, or low-temperature environments.
1. Petroleum Machinery Sector
Typical Components: Lightweight lifting rings, elevators, perforating guns, and other components in drilling hoisting systems.
Application Advantages:
High Hardenability: Achieves full hardening in oil with diameters up to 60-80 mm (>95% martensite) and in water up to 110-120 mm, ensuring uniform strength in large-section components.
Low-Temperature Toughness: Maintains excellent toughness in low-temperature environments (e.g., Arctic or deep-sea operations), preventing brittle fracture.
Fatigue Resistance: Significantly improves fatigue performance through quenching + low-temperature tempering, extending component service life.
2. Aerospace Sector
Typical Components: Structural parts for missiles and aircraft (e.g., wing supports, landing gear components).
Application Advantages:
Balanced High Strength and Lightweight Design: Offers a tensile strength of ≥1380 MPa and yield strength of ≥1000 MPa while reducing weight through optimized composition design.
Corrosion Resistance: Chromium (Cr) content forms a dense oxide film, resisting atmospheric and salt spray corrosion for high-altitude applications.
Process Adaptability: Supports forging, hot rolling, and other processing methods to meet manufacturing requirements for complex-shaped components.
3. Automotive Industry
Typical Components: Critical parts such as engine crankshafts, connecting rods, and drive shafts.
Application Advantages:
High Load-Bearing Capacity: Yield strength far exceeds that of ordinary carbon steel, enabling it to withstand immense stress during high-speed engine operation.
Impact Resistance: Low-temperature impact energy ≥55 J (-20°C), adapting to cold regions or sudden impact loads.
Wear Resistance: Achieves tempered sorbite structure through quenching and tempering, enhancing surface hardness and reducing wear.
4. Construction and Bridge Engineering
Typical Components: Steel structures for high-rise buildings, bridge girders, crossbeams, etc.
Application Advantages:
Structural Stability: High strength and good plasticity ensure stability under dynamic loads such as earthquakes and wind forces.
Weldability: Preheating above 300°C before welding prevents cracks, while slow cooling after welding reduces residual stress, facilitating on-site assembly of large structures.
Durability: Chromium and nickel elements enhance atmospheric corrosion resistance, reducing maintenance costs.
