JIS G4805 20MnCr5 Introduce
JIS G4805 20MnCr5 is a type of Japanese Industrial Standard (JIS) steel which is most commonly used in the manufacture of automotive components and parts. JIS G4805 20MnCr5 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 20MnCr5 steels are known for their superior wear resistance, which is important for automotive components that move at high velocities. JIS G4805 20MnCr5 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 20MnCr5 steel, and is largely responsible for its superior wear resistance.
Smelting temperature:1967°C - 1336°C
Application:High carbon chromium bearing steel
JIS G4805 20MnCr5 Material Chemical Composition
The chemical composition of the JIS G4805 20MnCr5 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.4000 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Manganese (Mn) | 1.1000 | 1.4000 |
| Chromium (Cr) | 1.0000 | 1.3000 |
| Carbon (C) | 0.1700 | 0.2300 |
JIS G4805 20MnCr5 Material Mechanical Properties
The mechanical properties of the JIS G4805 20MnCr5 steel are as follows:
| YieldRp0.2 | ≤ 795 (MPa) |
| TeileRm | ≤ 428 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 314 |
JIS G4805 20MnCr5 Material Thermal Properties
The thermal performance parameters of the JIS G4805 20MnCr5 steel are as follows:
| Temperature (°C) | 31 | 341 | 545 |
| Modulus of elasticity (GPa) | - | 764 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 31.2 |
| Specific thermal capacity (J/kg·°C) | - | 314 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.12 | - | - |
| Deity (kg/dm³) | - | - | 134 |
| Poisson’s coefficient, ν | - | - | 411 |