Characteristics of GB 3077 45Cr Steel
Outstanding Mechanical Properties
Tensile strength: ≥1,030 MPa
Yield strength: ≥835 MPa
Elongation: ≥9%
Reduction of area: ≥40%
Impact energy: ≥39 J
Superior hardenability: Critical oil-quenching diameter: 12–45 mm; critical water-quenching diameter: 26–71 mm. This far exceeds that of ordinary carbon steels (e.g., 45 steel has a water-quenching critical diameter of only 12–17 mm), making it suitable for manufacturing large-sized components.
Thermal Treatment Adaptability
Quenching and tempering: Oil quenching at 840°C followed by tempering at 520°C ensures optimal comprehensive mechanical properties, combining strength and toughness.
Surface hardening: Supports processes such as high-frequency quenching and flame quenching, achieving a surface hardness of HRC 55–58 while maintaining core toughness.
Process and Cost Balance
Moderate cost and ease of processing: Its price is reasonable, and it can be machined with ease. Processes like normalizing and annealing can improve cutting performance, reducing production costs.
