GB/T 3077 A40402 Introduce
GB/T 3077 A40402 steel is a versatile material that is ideal for a variety of engineering and automotive applications. Its high strength and ductility allow it to endure heavy loads and stress, while its impact resistance and fatigue resistance make it suitable for use in parts and components that are subject to frequent vibration or impacts. GB/T 3077 A40402 steel is highly economical. It has good weldability and is easy to shape and form, which make it cost-effective to produce. It is also resistant to corrosion and is available in a variety of grades, making it a versatile and reliable material for a wide range of applications.
Smelting temperature:1658°C - 1762°C
Application:Alloy structural steel
GB/T 3077 A40402 Material Chemical Composition
The chemical composition of the GB/T 3077 A40402 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | 1.0000 | 1.4000 |
| Molybdenum (Mo) | - | 0.1500 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| Copper (Cu) | - | 0.3000 |
| Chromium (Cr) | 0.4500 | 0.7500 |
| Carbon (C) | 0.3700 | 0.4400 |
GB/T 3077 A40402 Material Mechanical Properties
GB/T 3077 A40402 is mostly used for engineering, industrial and transportation applications that require high strength, corrosion resistance, superior performance, and long service life. GB/T 3077 A40402 meets the demands of the most stringent applications with its good machinability, low cost, good formability and high strength-to-weight ratio. It is the perfect choice for automotive, aerospace, and other lightweight applications.
The mechanical properties of the GB/T 3077 A40402 steel are as follows:
| YieldRp0.2 | ≤ 152 (MPa) |
| TeileRm | ≤ 787 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 34% |
| Reduction in cross section on fractureZ | 33% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 424 |
GB/T 3077 A40402 Material Thermal Properties
The thermal performance parameters of the GB/T 3077 A40402 steel are as follows:
| Temperature (°C) | 22 | 989 | 832 |
| Modulus of elasticity (GPa) | - | 142 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 44 |
| Thermal conductivity (W/m·°C) | - | 41.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 124 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.21 | - | - |
| Deity (kg/dm³) | - | - | 144 |
| Poisson’s coefficient, ν | - | - | 322 |
GB/T 3077 A40402 Material Machining Technology
When performing machining operations on GB/T 3077 A40402 steel, it is important to use the correct cutting speed and feed rates. The cutting speed should be adjusted based on the size and shape of the workpiece, as well as the hardness and strength of the steel. It is also important to use the proper cutting tools and lubricants to ensure the best results. Using the wrong cutting tools or failing to use adequate lubrication can lead to poor surface finish, overheating, and other issues.