GB/T 699 U20253 Introduce
The hardness of GB/T 699 U20253 is usually measured by the Brinell Hardness Test. This test measures the resistance of the steel to surface indentations made by a small steel ball. GB/T 699 U20253 has a Brinell Hardness of approximately 180-240 HBW. In terms of strength, GB/T 699 U20253 has a tensile strength of approximately 420-520MPa, making it one of the strongest steel alloys available. This high strength and hardness makes it suitable for a wide range of applications, including precision machining, engineering tools, and automobiles.
Smelting temperature:1618°C - 1464°C
Application:High quality carbon structural steel
GB/T 699 U20253 Material Chemical Composition
The chemical composition of the GB/T 699 U20253 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0300 |
| PhOsphorus (P) | - | 0.0300 |
| Nickel (Ni) | - | 0.3000 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| Copper (Cu) | - | 0.2500 |
| Chromium (Cr) | - | 0.2500 |
| Carbon (C) | 0.2200 | 0.2900 |
GB/T 699 U20253 Material Mechanical Properties
The mechanical properties of the GB/T 699 U20253 steel are as follows:
| YieldRp0.2 | ≤ 216 (MPa) |
| TeileRm | ≤ 783 (MPa) |
| ImpactKV/Ku | 13(J) |
| ElongationA | 43% |
| Reduction in cross section on fractureZ | 14% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 313 |
GB/T 699 U20253 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U20253 steel are as follows:
| Temperature (°C) | 21 | 429 | 344 |
| Modulus of elasticity (GPa) | - | 871 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 31.2 |
| Specific thermal capacity (J/kg·°C) | - | 442 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.23 | - | - |
| Deity (kg/dm³) | - | - | 324 |
| Poisson’s coefficient, ν | - | - | 231 |
GB/T 699 U20253 Material Machining Technology
Machining of GB/T 699 U20253 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 U20253 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 U20253 steel is used extensively in the manufacture of machinery and tools, as it is strong, durable and has excellent corrosion resistance.