GB/T 699 U20752 Introduce
GB/T 699 U20752 steel is commonly used in construction, automotive, and shipbuilding industries due to its strength and resistance to corrosion and wear. It is often used for structural components such as bridges, automobile frames, and ship hulls. In addition, it is often used in construction and mining equipment, machine tools, and other industrial applications.
Smelting temperature:1337°C - 1392°C
Application:High quality carbon structural steel
GB/T 699 U20752 Material Chemical Composition
The chemical composition of the GB/T 699 U20752 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.7200 | 0.8000 |
| Silicon (Si) | 0.1700 | 0.3700 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Chromium (Cr) | - | 0.2500 |
| Nickel (Ni) | - | 0.3000 |
| Copper (Cu) | - | 0.2500 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | - | 0.2500 |
| Copper (Cu) | - | 0.2000 |
| Carbon (C) | 0.7300 | 0.7900 |
GB/T 699 U20752 Material Mechanical Properties
The mechanical properties of the GB/T 699 U20752 steel are as follows:
| YieldRp0.2 | ≤ 832 (MPa) |
| TeileRm | ≤ 449 (MPa) |
| ImpactKV/Ku | 23(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 231 |
GB/T 699 U20752 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U20752 steel are as follows:
| Temperature (°C) | 21 | 554 | 262 |
| Modulus of elasticity (GPa) | - | 149 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 24 |
| Thermal conductivity (W/m·°C) | - | 44.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 244 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.21 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 443 |
GB/T 699 U20752 Material Machining Technology
Drilling is also commonly used to machine GB/T 699 U20752 steel. This involves using a drill to make holes in the steel. Various types of drills, such as drills with carbide tips, are used to drill through the steel. To ensure accuracy, the correct drill bit size must be selected and the correct setting on the drill press must be used.