GB/T 699 U21452 Introduce
Steel is one of the most widely used materials in the world, used for a variety of applications from construction to transportation. GB/T 699 U21452 is a popular alloy steel used for a variety of purposes, from precision machining to general engineering use. GB/T 699 U21452 is an alloy which is made up of two different types of steel: high-carbon steel and low-carbon steel. The high-carbon steel is used for the formation of the "matrix" of the metal; this contains the majority of the chemical elements listed above. The low-carbon steel is added for strength and is found mainly in the "alloying" elements. This combination of high-carbon and low-carbon steel creates a metal that is stronger and more durable than either type of steel alone.
Smelting temperature:1912°C - 1549°C
Application:High quality carbon structural steel
GB/T 699 U21452 Material Chemical Composition
The chemical composition of the GB/T 699 U21452 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.3000 |
| Manganese (Mn) | 0.7000 | 1.0000 |
| Copper (Cu) | - | 0.2500 |
| Chromium (Cr) | - | 0.2500 |
| Carbon (C) | 0.4200 | 0.5000 |
GB/T 699 U21452 Material Mechanical Properties
The mechanical properties of the GB/T 699 U21452 steel are as follows:
| YieldRp0.2 | ≤ 846 (MPa) |
| TeileRm | ≤ 662 (MPa) |
| ImpactKV/Ku | 24(J) |
| ElongationA | 44% |
| Reduction in cross section on fractureZ | 21% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 432 |
GB/T 699 U21452 Material Thermal Properties
The thermal performance parameters of the GB/T 699 U21452 steel are as follows:
| Temperature (°C) | 42 | 399 | 524 |
| Modulus of elasticity (GPa) | - | 562 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 44.2 |
| Specific thermal capacity (J/kg·°C) | - | 111 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.24 | - | - |
| Deity (kg/dm³) | - | - | 214 |
| Poisson’s coefficient, ν | - | - | 212 |
GB/T 699 U21452 Material Machining Technology
Heat treatment is a process used to alter the physical and chemical properties of metals, including GB/T 699 U21452 steel. The purpose of this process is to improve the strength and toughness of the steel. Heat treatment typically involves heating the steel and then cooling it rapidly. Various types of heat treating can be used to alter the properties of the steel, such as annealing, quenching, and tempering.