| Quantity: | |
|---|---|
CHEMICAL COMPOSITION
C: 0.38%-0.45%
Si: 0.17%-0.37%
Mn: 0.50%-0.80%
S: Allowable residual content ≤0.035%
P: Allowable residual content ≤0.035%
Cr: 0.90%-1.20%
Ni: Allowable residual content ≤0.30%
Cu: Allowable residual content ≤0.30%
Mo: 0.15%-0.25%
MECHANICAL PROPERTIES
Tensile strength σb (MPa): ≥1080 (110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5(%): ≥12
Area shrinkage ψ (%): ≥45
Impact power Akv (J): ≥63
Impact toughness value αkv (J/cm²): ≥78(8)
Hardness: ≤217HB
HEAT TREATMENT
Annealing process: Annealing can be further divided into softening annealing and quenching and tempering annealing. Preheat to 500-700℃, heat to 800-900℃, keep warm for a period of time, and then slowly cool to room temperature.
Quenching, tempering and annealing: preheat to 500-700℃, heat to 850-880℃, keep warm, and then quickly immerse in water or oil to extinguish the fire. Water quenching is more effective, but may cause deformation and cracking; oil quenching is gentler. After that, tempering is carried out, and the steel billet is heated to 300-600°C, kept for a period of time and then cooled to room temperature.
High-frequency induction quenching: Use high-frequency induction heating for surface quenching, and then perform tempering treatment at 200°C × 2 hours.
FORGING
Preliminary preparation: Before forging, the raw materials need to be properly heat treated. This usually involves heating to a certain temperature, holding warm for a period of time, and then air or oil cooling.
Forging temperature: The optimal forging temperature is 950℃-1200℃, and the recommended forging temperature is 1050℃-1150℃. The selection of forging temperature should be reasonably determined based on factors such as forging ratio, forging shape and forging size.
Forging ratio: During the forging process, a sufficient forging ratio needs to be ensured to ensure that the segregation within the material and the original as-cast structure of the steel ingot are improved. Insufficient forging ratio may lead to the retention of defects such as segregation and porosity, while excessive forging ratio may lead to increased anisotropy of mechanical properties.
Post-forging heat treatment: Heat treatment, such as normalizing or quenching and tempering, is usually required after forging to improve its organizational structure and improve its mechanical properties.
CHEMICAL COMPOSITION
C: 0.38%-0.45%
Si: 0.17%-0.37%
Mn: 0.50%-0.80%
S: Allowable residual content ≤0.035%
P: Allowable residual content ≤0.035%
Cr: 0.90%-1.20%
Ni: Allowable residual content ≤0.30%
Cu: Allowable residual content ≤0.30%
Mo: 0.15%-0.25%
MECHANICAL PROPERTIES
Tensile strength σb (MPa): ≥1080 (110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5(%): ≥12
Area shrinkage ψ (%): ≥45
Impact power Akv (J): ≥63
Impact toughness value αkv (J/cm²): ≥78(8)
Hardness: ≤217HB
HEAT TREATMENT
Annealing process: Annealing can be further divided into softening annealing and quenching and tempering annealing. Preheat to 500-700℃, heat to 800-900℃, keep warm for a period of time, and then slowly cool to room temperature.
Quenching, tempering and annealing: preheat to 500-700℃, heat to 850-880℃, keep warm, and then quickly immerse in water or oil to extinguish the fire. Water quenching is more effective, but may cause deformation and cracking; oil quenching is gentler. After that, tempering is carried out, and the steel billet is heated to 300-600°C, kept for a period of time and then cooled to room temperature.
High-frequency induction quenching: Use high-frequency induction heating for surface quenching, and then perform tempering treatment at 200°C × 2 hours.
FORGING
Preliminary preparation: Before forging, the raw materials need to be properly heat treated. This usually involves heating to a certain temperature, holding warm for a period of time, and then air or oil cooling.
Forging temperature: The optimal forging temperature is 950℃-1200℃, and the recommended forging temperature is 1050℃-1150℃. The selection of forging temperature should be reasonably determined based on factors such as forging ratio, forging shape and forging size.
Forging ratio: During the forging process, a sufficient forging ratio needs to be ensured to ensure that the segregation within the material and the original as-cast structure of the steel ingot are improved. Insufficient forging ratio may lead to the retention of defects such as segregation and porosity, while excessive forging ratio may lead to increased anisotropy of mechanical properties.
Post-forging heat treatment: Heat treatment, such as normalizing or quenching and tempering, is usually required after forging to improve its organizational structure and improve its mechanical properties.
