JIS G4805 20Cr4 Introduce
JIS G4805 20Cr4 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 20Cr4 steel is an iron-based alloy containing a variety of alloying elements, including chromium, nickel, molybdenum and vanadium.
Smelting temperature:1232°C - 1786°C
Application:High carbon chromium bearing steel
JIS G4805 20Cr4 Material Chemical Composition
The chemical composition of the JIS G4805 20Cr4 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1500 | 0.4000 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Manganese (Mn) | 0.6000 | 0.9000 |
| Chromium (Cr) | 0.9000 | 1.2000 |
| Carbon (C) | 0.1700 | 0.2300 |
| Silicon (Si) | - | 0.4000 |
| Sulfur (S) | - | 0.0150 |
| PhOsphorus (P) | - | 0.0250 |
JIS G4805 20Cr4 Material Mechanical Properties
The mechanical properties of the JIS G4805 20Cr4 steel are as follows:
| YieldRp0.2 | ≤ 264 (MPa) |
| TeileRm | ≤ 922 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 124 |
JIS G4805 20Cr4 Material Thermal Properties
The thermal performance parameters of the JIS G4805 20Cr4 steel are as follows:
| Temperature (°C) | 23 | 413 | 561 |
| Modulus of elasticity (GPa) | - | 631 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 21.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 332 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 313 |
| Poisson’s coefficient, ν | - | - | 232 |