JIS G4805 20MnCr4-2 Introduce
JIS G4805 20MnCr4-2 is a type of Japanese Industrial Standard (JIS) steel which is most commonly used in the manufacture of automotive components and parts. JIS G4805 20MnCr4-2 steels possess excellent hardenability. Hardenability is the ability of a metal to be hardened by heat treatment. The higher the steel's hardenability, the greater its ability to withstand heavy loads and wear properties. JIS G4805 20MnCr4-2 steels are known for their superior wear resistance, which is important for automotive components that move at high velocities. JIS G4805 20MnCr4-2 steels have excellent tensile strength properties. Tensile strength determines the resistance of a material to stretching, tension, and external pressure. It is one of the most important mechanical properties of JIS G4805 20MnCr4-2 steel, and is largely responsible for its superior wear resistance.
Smelting temperature:1183°C - 1492°C
Application:High carbon chromium bearing steel
JIS G4805 20MnCr4-2 Material Mechanical Properties
The mechanical properties of the JIS G4805 20MnCr4-2 steel are as follows:
| YieldRp0.2 | ≤ 197 (MPa) |
| TeileRm | ≤ 287 (MPa) |
| ImpactKV/Ku | 31(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 144 |
JIS G4805 20MnCr4-2 Material Thermal Properties
The thermal performance parameters of the JIS G4805 20MnCr4-2 steel are as follows:
| Temperature (°C) | 41 | 335 | 627 |
| Modulus of elasticity (GPa) | - | 373 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 24.2 |
| Specific thermal capacity (J/kg·°C) | - | 123 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 233 |
| Poisson’s coefficient, ν | - | - | 424 |