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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.
