JIS G7105 C55E4 Introduce
Steel is an essential component of modern industrial and commercial infrastructure, ranging from bridges and buildings to industrial equipment and consumer products. JIS G7105 C55E4 is one such steel, popular for its high strength, wear and corrosion resistance and good formability. Most JIS G7105 grades have a very high carbon content (0.70 – 0.80%), and a chromium content of 0.30 – 0.90%. This helps the steel to maintain its ductility at elevated temperatures, as well as maintain strength and hardness during heat treatments. Another very important element is nickel. It has a high level of resistance to corrosion and assists in making the steel resistant to heat treatments, an important feature in many manufacturing processes.
Smelting temperature:1672°C - 1536°C
Application:Heat-treated steel, alloy steel, free-cutting steel - Part 18: Bright alloy steel and low alloy steel
JIS G7105 C55E4 Material Chemical Composition
The chemical composition of the JIS G7105 C55E4 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1000 | 0.4000 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Manganese (Mn) | 0.6000 | 0.9000 |
| Carbon (C) | 0.5000 | 0.5200 |
JIS G7105 C55E4 Material Mechanical Properties
The mechanical properties of the JIS G7105 C55E4 steel are as follows:
| YieldRp0.2 | ≤ 182 (MPa) |
| TeileRm | ≤ 213 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 43% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 134 |
JIS G7105 C55E4 Material Thermal Properties
The thermal performance parameters of the JIS G7105 C55E4 steel are as follows:
| Temperature (°C) | 41 | 389 | 778 |
| Modulus of elasticity (GPa) | - | 375 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 21 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 333 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 413 |
| Poisson’s coefficient, ν | - | - | 313 |