GB/T 699 08-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 08-A steel is one of the most popular steels for mechanical applications in China.
Smelting temperature:1243°C - 1819°C
Application:High quality carbon structural steel
GB/T 699 08-A Material Mechanical Properties
The mechanical properties of the GB/T 699 08-A steel are as follows:
| YieldRp0.2 | ≤ 239 (MPa) |
| TeileRm | ≤ 731 (MPa) |
| ImpactKV/Ku | 42(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 31% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 141 |
GB/T 699 08-A Material Thermal Properties
The thermal performance parameters of the GB/T 699 08-A steel are as follows:
| Temperature (°C) | 44 | 944 | 572 |
| Modulus of elasticity (GPa) | - | 876 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 13.3 | 34.2 |
| Specific thermal capacity (J/kg·°C) | - | 312 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 123 |
| Poisson’s coefficient, ν | - | - | 334 |
GB/T 699 08-A Material Machining Technology
Heat treatment is a process used to alter the physical and chemical properties of metals, including GB/T 699 08-A steel. The purpose of this process is to improve the strength and toughness of the steel. Heat treatment typically involves heating the steel and then cooling it rapidly. Various types of heat treating can be used to alter the properties of the steel, such as annealing, quenching, and tempering.