GB/T 699 U21702 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 U21702 steel is one of the most popular steels for mechanical applications in China.
Smelting temperature:1293°C - 1854°C
Application:High quality carbon structural steel
GB/T 699 U21702 Material Chemical Composition
The chemical composition of the GB/T 699 U21702 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Manganese (Mn) | 0.9000 | 1.2000 |
| Copper (Cu) | - | 0.2000 |
| Chromium (Cr) | - | 0.2500 |
| Carbon (C) | 0.6700 | 0.7500 |
GB/T 699 U21702 Material Mechanical Properties
The mechanical properties of the GB/T 699 U21702 steel are as follows:
| YieldRp0.2 | ≤ 534 (MPa) |
| TeileRm | ≤ 674 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 32% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 443 |
GB/T 699 U21702 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U21702 steel are as follows:
| Temperature (°C) | 31 | 187 | 454 |
| Modulus of elasticity (GPa) | - | 224 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 11 |
| Thermal conductivity (W/m·°C) | - | 33.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 241 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 321 |
| Poisson’s coefficient, ν | - | - | 424 |
GB/T 699 U21702 Material Machining Technology
Machining of GB/T 699 U21702 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 U21702 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 U21702 steel is used extensively in the manufacture of machinery and tools, as it is strong, durable and has excellent corrosion resistance.