GB/T 699 U20652 Introduce
GB/T 699 U20652 is a popular alloy steel used for a variety of purposes, from precision machining to general engineering use. Its chemical composition includes iron, carbon, manganese, silicon, sulfur, and phosphorus. It also has a Brinell Hardness of approximately 180-240 HBW, and a tensile strength of 420-520MPa. The advantages of GB/T 699 U20652 steel include its high strength, hardness, and low cost. On the other hand, its disadvantages include limited ductility and brittleness over time. Common applications of GB/T 699 U20652 steel include automotive components, machine parts, engine components, and precision tools.
Smelting temperature:1588°C - 1464°C
Application:High quality carbon structural steel
GB/T 699 U20652 Material Chemical Composition
The chemical composition of the GB/T 699 U20652 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.6200 | 0.7000 |
| 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 |
| Copper (Cu) | - | 0.2500 |
| Chromium (Cr) | - | 0.2000 |
GB/T 699 U20652 Material Mechanical Properties
The mechanical properties of the GB/T 699 U20652 steel are as follows:
| YieldRp0.2 | ≤ 156 (MPa) |
| TeileRm | ≤ 439 (MPa) |
| ImpactKV/Ku | 12(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 41% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 142 |
GB/T 699 U20652 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U20652 steel are as follows:
| Temperature (°C) | 21 | 571 | 591 |
| Modulus of elasticity (GPa) | - | 419 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 42.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 341 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.44 | - | - |
| Deity (kg/dm³) | - | - | 321 |
| Poisson’s coefficient, ν | - | - | 412 |
GB/T 699 U20652 Material Machining Technology
Machining of GB/T 699 U20652 steel requires a combination of multiple processes, such as turning, drilling, grinding, and welding. Heat treatment is also used to alter the physical and chemical properties of the steel. Each process offers advantages for specific components, and knowing which process is best for the job is essential for ensuring quality results.