GB/T 3077 A40202 Introduce
GB/T 3077 A40202 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 A40202 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:1684°C - 1919°C
Application:Alloy structural steel
GB/T 3077 A40202 Material Chemical Composition
The chemical composition of the GB/T 3077 A40202 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) | 0.4000 | 0.7000 |
| Copper (Cu) | - | 0.3000 |
| Chromium (Cr) | 0.4500 | 0.7500 |
| Carbon (C) | 0.1700 | 0.2300 |
GB/T 3077 A40202 Material Mechanical Properties
GB/T 3077 A40202 is generally suitable for forging and hot forming, cold forming, and heat treatment. It is mainly used in the form of bars and plates, however, some grades can be used as thin-walled tube, thin plate, and thin wire products. After cold forming, the mechanical properties of GB/T 3077 A40202 are slightly improved.
The mechanical properties of the GB/T 3077 A40202 steel are as follows:
| YieldRp0.2 | ≤ 712 (MPa) |
| TeileRm | ≤ 871 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 22% |
| Reduction in cross section on fractureZ | 42% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 343 |
GB/T 3077 A40202 Material Thermal Properties
The thermal performance parameters of the GB/T 3077 A40202 steel are as follows:
| Temperature (°C) | 11 | 538 | 196 |
| Modulus of elasticity (GPa) | - | 176 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 41 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 33.2 |
| Specific thermal capacity (J/kg·°C) | - | 243 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.31 | - | - |
| Deity (kg/dm³) | - | - | 133 |
| Poisson’s coefficient, ν | - | - | 242 |
GB/T 3077 A40202 Material Machining Technology
When working with GB/T 3077 A40202 steel, it is important to be aware of the materials and tools required to achieve the desired results. Generally, this type of steel is machined using standard tools, such as drills, taps, reamers, and turning tools. It can be machined using both traditional and CNC machines, including lathes and mills.