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CHEMICAL COMPOSITION
C : 0.51-0.59
Mn: 0.70-0.95
P: ≤0.035
S: ≤0.04
Si: 1.80-2.20
MECHANICAL PROPERTIES
Ultimate Tensile Strength: approximately 774 MPa
Yield Strength: approximately 486 MPa
Young’s Modulus: 190 - 210 GPa
Poisson’s Ratio: 0.27 - 0.30
Reduction of Area: approximately 41%
PHYSICAL PROPERTIES
Density: 7700 - 8030 kg/m³
Young's modulus (modulus of elasticity): 190 - 210 GPa
Shear modulus: 80 GPa
Bulk Modulus: 140 GPa
Specific Heat Capacity: 470 J/kg·K
Electrical Conductivity: 4.29×10^6 S/m
Electrical Resistivity: 2.33×10^-7 Ω·m
Thermal expansion coefficient: Usually the thermal expansion coefficient of this type of alloy steel is on the order of 10^-6/°C.
HEAT TREATMENT
Annealing: including incomplete/complete annealing, isothermal annealing, spheroidizing annealing, and stress relief annealing. These annealing processes help reduce hardness, improve plasticity, and remove internal stress.
Normalizing: Mainly to improve the mechanical properties of low carbon AISI 9255 steel and improve the machinability.
Quenching: The quenching medium can be brine quenching, water quenching or oil quenching. The material hardness will be significantly increased after quenching.
Tempering: Common tempering processes include low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering. Tempering can reduce the internal stress after quenching and improve toughness and stability.
CHEMICAL COMPOSITION
C : 0.51-0.59
Mn: 0.70-0.95
P: ≤0.035
S: ≤0.04
Si: 1.80-2.20
MECHANICAL PROPERTIES
Ultimate Tensile Strength: approximately 774 MPa
Yield Strength: approximately 486 MPa
Young’s Modulus: 190 - 210 GPa
Poisson’s Ratio: 0.27 - 0.30
Reduction of Area: approximately 41%
PHYSICAL PROPERTIES
Density: 7700 - 8030 kg/m³
Young's modulus (modulus of elasticity): 190 - 210 GPa
Shear modulus: 80 GPa
Bulk Modulus: 140 GPa
Specific Heat Capacity: 470 J/kg·K
Electrical Conductivity: 4.29×10^6 S/m
Electrical Resistivity: 2.33×10^-7 Ω·m
Thermal expansion coefficient: Usually the thermal expansion coefficient of this type of alloy steel is on the order of 10^-6/°C.
HEAT TREATMENT
Annealing: including incomplete/complete annealing, isothermal annealing, spheroidizing annealing, and stress relief annealing. These annealing processes help reduce hardness, improve plasticity, and remove internal stress.
Normalizing: Mainly to improve the mechanical properties of low carbon AISI 9255 steel and improve the machinability.
Quenching: The quenching medium can be brine quenching, water quenching or oil quenching. The material hardness will be significantly increased after quenching.
Tempering: Common tempering processes include low temperature tempering, medium temperature tempering, high temperature tempering and multiple tempering. Tempering can reduce the internal stress after quenching and improve toughness and stability.
