GB/T 699 25Mn-A Introduce
Steel is one of the most commonly used materials in the world. It is a strong and durable material that can be shaped in a variety of ways and is used in almost every industry. Steel comes in different grades, with each grade having different mechanical properties. GB/T 699 25Mn-A steel is one of the most popular steels for mechanical applications in China.
Smelting temperature:1923°C - 1118°C
Application:High quality carbon structural steel
GB/T 699 25Mn-A Material Chemical Composition
The chemical composition of the GB/T 699 25Mn-A steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Nickel (Ni) | - | 0.3000 |
| Manganese (Mn) | 0.7000 | 1.0000 |
| Copper (Cu) | - | 0.2500 |
| Chromium (Cr) | - | 0.2500 |
| Carbon (C) | 0.2200 | 0.2900 |
GB/T 699 25Mn-A Material Mechanical Properties
The mechanical properties of the GB/T 699 25Mn-A steel are as follows:
| YieldRp0.2 | ≤ 698 (MPa) |
| TeileRm | ≤ 183 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 43% |
| Reduction in cross section on fractureZ | 22% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 121 |
GB/T 699 25Mn-A Material Thermal Properties
The thermal performance parameters of the GB/T 699 25Mn-A steel are as follows:
| Temperature (°C) | 32 | 993 | 376 |
| Modulus of elasticity (GPa) | - | 933 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 214 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 121 |
| Poisson’s coefficient, ν | - | - | 314 |
GB/T 699 25Mn-A Material Machining Technology
Machining of GB/T 699 25Mn-A steel typically requires a combination of diverse machining processes for quality production of more complex components. China being the biggest steel producers in the world, manufactures and supplies GB/T 699 25Mn-A steel, which is a high-quality carbon structural steel. This type of steel is machinable and is suitable for the manufacture of automotive parts, machine tools, and many other machines. Typically, GB/T 699 25Mn-A steel is used extensively in the manufacture of machinery and tools, as it is strong, durable and has excellent corrosion resistance.