JIS G4805 70Mn4 Introduce
JIS G4805 70Mn4 is one of the most commonly used steels in the world. It is widely used in a variety of applications ranging from consumer goods to large-scale construction projects. This steel is known for its exceptional strength, durability, and chemical properties. JIS G4805 70Mn4 steel is an iron-based alloy containing a variety of alloying elements, including chromium, nickel, molybdenum and vanadium.
Smelting temperature:1741°C - 1692°C
Application:High carbon chromium bearing steel
JIS G4805 70Mn4 Material Mechanical Properties
The mechanical properties of the JIS G4805 70Mn4 steel are as follows:
| YieldRp0.2 | ≤ 676 (MPa) |
| TeileRm | ≤ 148 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 33% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 334 |
JIS G4805 70Mn4 Material Thermal Properties
The thermal performance parameters of the JIS G4805 70Mn4 steel are as follows:
| Temperature (°C) | 12 | 849 | 367 |
| Modulus of elasticity (GPa) | - | 361 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 232 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 142 |
| Poisson’s coefficient, ν | - | - | 423 |