GB/T 699 75-E Introduce
GB/T 699 75-E 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:1328°C - 1438°C
Application:High quality carbon structural steel
GB/T 699 75-E Material Chemical Composition
The chemical composition of the GB/T 699 75-E steel are as follows:
| Element | Min | Max |
|---|---|---|
| Copper (Cu) | - | 0.2500 |
| Nickel (Ni) | - | 0.3000 |
| Chromium (Cr) | - | 0.2500 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| Silicon (Si) | 0.1700 | 0.3700 |
| Carbon (C) | 0.7200 | 0.8000 |
GB/T 699 75-E Material Mechanical Properties
The mechanical properties of the GB/T 699 75-E steel are as follows:
| YieldRp0.2 | ≤ 211 (MPa) |
| TeileRm | ≤ 492 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 44% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 321 |
GB/T 699 75-E Material Thermal Properties
The thermal performance parameters of the GB/T 699 75-E steel are as follows:
| Temperature (°C) | 13 | 812 | 241 |
| Modulus of elasticity (GPa) | - | 224 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 42.2 |
| Specific thermal capacity (J/kg·°C) | - | 434 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.12 | - | - |
| Deity (kg/dm³) | - | - | 414 |
| Poisson’s coefficient, ν | - | - | 441 |
GB/T 699 75-E Material Machining Technology
Turning is one of the most common operations used to machine GB/T 699 75-E steel. During this process, devices such as drills, reamers, and lathes are used. Various techniques that can be used to machine steel include single-point, multiple-point and threading. Single-pointing involves cutting a single groove into the surface of the steel. Multiple-pointing involves the use of multiple cutting edges to create multiple grooves into the surface of the steel. Threading is a type of precision machining used to create threads in the surface of the steel.