GB/T 3077 A74202 Introduce
GB/T 3077 A74202 steel is a versatile material that is used in the construction of bridges, vessels, chemical tanks and other structures that must be able to withstand extreme conditions. Its set of unique chemical properties, such as high tensile strength, excellent ductility, heat resistance, corrosion resistance, weldability and machinability make it the perfect choice for a wide range of demanding applications.
Smelting temperature:1618°C - 1275°C
Application:Alloy structural steel
GB/T 3077 A74202 Material Chemical Composition
The chemical composition of the GB/T 3077 A74202 steel are as follows:
| Element | Min | Max |
|---|---|---|
| Titanium (Ti) | 0.0400 | 0.1000 |
| Silicon (Si) | 0.1700 | 0.3700 |
| Sulfur (S) | - | 0.0350 |
| PhOsphorus (P) | - | 0.0350 |
| Nickel (Ni) | - | 0.3000 |
| Molybdenum (Mo) | - | 0.1500 |
| Manganese (Mn) | 1.3000 | 1.6000 |
| Copper (Cu) | - | 0.3000 |
| Chromium (Cr) | - | 0.3000 |
| Carbon (C) | 0.1700 | 0.2400 |
| Boron (B) | 0.0005 | 0.0035 |
GB/T 3077 A74202 Material Mechanical Properties
The mechanical properties of GB/T 3077 A74202 steel, hardness, impact resistance, and fatigue resistance.
Hardness: GB/T 3077 A74202 steel has a high hardness level, with a maximum hardness of up to HRC 58. This makes it resistant to wear and tear, and ideal for applications such as military vehicles and sheet metal components that require superior wear and abrasion resistance.
Impact resistance: GB/T 3077 A74202 steel is highly resistant to impacts caused by vibrations, temperature extremes, and impacts from dropping heavy objects. This makes it well suited for applications such as auto parts and construction components, which must be able to withstand frequent vibration or impacts without breaking or deforming.
Fatigue resistance: GB/T 3077 A74202 steel is resistant to fatigue due to its high strength-to-weight ratio. This means it can be used in applications where the steel must be able to withstand repeated cycles of loading and unloading without breaking or deforming.
The mechanical properties of the GB/T 3077 A74202 steel are as follows:
| YieldRp0.2 | ≤ 572 (MPa) |
| TeileRm | ≤ 145 (MPa) |
| ImpactKV/Ku | 34(J) |
| ElongationA | 13% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 212 |
GB/T 3077 A74202 Material Thermal Properties
The thermal performance parameters of the GB/T 3077 A74202 steel are as follows:
| Temperature (°C) | 44 | 521 | 757 |
| Modulus of elasticity (GPa) | - | 279 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 34 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 21.2 |
| Specific thermal capacity (J/kg·°C) | - | 211 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.11 | - | - |
| Deity (kg/dm³) | - | - | 231 |
| Poisson’s coefficient, ν | - | - | 322 |
GB/T 3077 A74202 Material Machining Technology
GB/T 3077 A74202 steel is a versatile material that is highly suited to automotive and engineering applications. Its high strength and its resistance to impacts, wear, and fatigue make it an excellent choice for parts and components that must be able to endure heavy loads, shocks, and vibrations without breaking or deforming. In addition to its mechanical properties, GB/T 3077 A74202 steel is economical and easy to manipulate, making it a reliable and cost-effective choice for many engineering and automotive designs.