| Quantity: | |
|---|---|
CHEMICAL COMPOSITION
C: 0.38-0.43
Si: 0.15-0.35
Mn: 0.75-1.00
P: ≤0.035
S: ≤0.04
Cr: 0.8-1.1
Mo: 0.15-0.25
MECHANICAL PROPERTIES
Tensile strength: 455-1598 MPa
Yield strength: 338-986 MPa
Elongation: 7-21%
Hardness: 196-397 HB
PHYSICAL PROPERTIES
Density: 7850 kg/m³
Brinell hardness: 200 to 310
Young's modulus (elastic modulus): 190 GPa
Poisson's ratio: 0.27 to 0.30
Thermal conductivity: 42.6 W/m·K
Specific heat capacity: 470 J/kg·K
Coefficient of thermal expansion: 1.22×10^-5^ 1/°C
Electrical conductivity: 4.23×10^6^ S/m
Resistivity: 2.36×10^-7^ Ω·m
HEAT TREATMENT
Normalizing: 850-900℃, Cool in air
Annealing: 830-850℃, Cool in furnace
Quenching: 840-880℃, Water/Oil quench
Tempering: 220-700°C, cooling in still air
FORGING
Forging of SAE 4140 should be done between 2200°F and 1650°F (1200°C to 900°C), with lower finishing temperatures resulting in finer grain size. After forging, it should be cooled slowly in oil or water to reduce internal stress and deformation.
CHEMICAL COMPOSITION
C: 0.38-0.43
Si: 0.15-0.35
Mn: 0.75-1.00
P: ≤0.035
S: ≤0.04
Cr: 0.8-1.1
Mo: 0.15-0.25
MECHANICAL PROPERTIES
Tensile strength: 455-1598 MPa
Yield strength: 338-986 MPa
Elongation: 7-21%
Hardness: 196-397 HB
PHYSICAL PROPERTIES
Density: 7850 kg/m³
Brinell hardness: 200 to 310
Young's modulus (elastic modulus): 190 GPa
Poisson's ratio: 0.27 to 0.30
Thermal conductivity: 42.6 W/m·K
Specific heat capacity: 470 J/kg·K
Coefficient of thermal expansion: 1.22×10^-5^ 1/°C
Electrical conductivity: 4.23×10^6^ S/m
Resistivity: 2.36×10^-7^ Ω·m
HEAT TREATMENT
Normalizing: 850-900℃, Cool in air
Annealing: 830-850℃, Cool in furnace
Quenching: 840-880℃, Water/Oil quench
Tempering: 220-700°C, cooling in still air
FORGING
Forging of SAE 4140 should be done between 2200°F and 1650°F (1200°C to 900°C), with lower finishing temperatures resulting in finer grain size. After forging, it should be cooled slowly in oil or water to reduce internal stress and deformation.
