GB/T 699 U20656 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 U20656 steel is one of the most popular steels for mechanical applications in China.
Smelting temperature:1319°C - 1637°C
Application:High quality carbon structural steel
GB/T 699 U20656 Material Chemical Composition
The chemical composition of the GB/T 699 U20656 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0200 |
| PhOsphorus (P) | - | 0.0250 |
| Nickel (Ni) | - | 0.3000 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| Copper (Cu) | - | 0.2500 |
| Chromium (Cr) | - | 0.2500 |
| Carbon (C) | 0.6200 | 0.7000 |
GB/T 699 U20656 Material Mechanical Properties
The mechanical properties of the GB/T 699 U20656 steel are as follows:
| YieldRp0.2 | ≤ 788 (MPa) |
| TeileRm | ≤ 919 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 44% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 141 |
GB/T 699 U20656 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U20656 steel are as follows:
| Temperature (°C) | 11 | 321 | 191 |
| Modulus of elasticity (GPa) | - | 585 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 14.2 |
| Specific thermal capacity (J/kg·°C) | - | 122 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 314 |
| Poisson’s coefficient, ν | - | - | 223 |
GB/T 699 U20656 Material Machining Technology
Turning is one of the most common operations used to machine GB/T 699 U20656 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.