JIS G7401 CC21A Introduce
JIS G7401 CC21A steel, also known as "Japanese Industrial Standard" steel, is a medium-carbon alloy steel that was developed for use in industrial machinery. It is composed primarily of iron, with a small quantity of manganese, chromium, and carbon. It is usually available in both hot-rolled and cold-rolled forms. JIS G7401 CC21A steel is composed primarily of iron with small alloying elements including manganese (0.5-1.5%), chromium (0.2-0.6%), and carbon (0.2-0.4%). The ingredients work together to strengthen the steel, providing significant corrosion and wear resistance. The presence of manganese enhances the tensile strength of the steel while the chromium increases corrosion resistance. Carbon imparts further strength and hardness to the steel.
Smelting temperature:1688°C - 1736°C
Application:Cold heading and cold extrusion steel
JIS G7401 CC21A Material Chemical Composition
The chemical composition of the JIS G7401 CC21A steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | - | 0.1000 |
| Sulfur (S) | - | 0.0400 |
| PhOsphorus (P) | - | 0.0400 |
| Manganese (Mn) | 0.3000 | 0.6000 |
| Carbon (C) | 0.1800 | 0.2300 |
| Aluminum (Al) | 0.0200 | - |
JIS G7401 CC21A Material Mechanical Properties
The mechanical properties of the JIS G7401 CC21A steel are as follows:
| YieldRp0.2 | ≤ 286 (MPa) |
| TeileRm | ≤ 176 (MPa) |
| ImpactKV/Ku | 22(J) |
| ElongationA | 42% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 312 |
JIS G7401 CC21A Material Thermal Properties
The thermal performance parameters of the JIS G7401 CC21A steel are as follows:
| Temperature (°C) | 22 | 952 | 172 |
| Modulus of elasticity (GPa) | - | 489 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 342 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 223 |
| Poisson’s coefficient, ν | - | - | 133 |