GB/T 3077 A20302 Introduce
GB/T 3077 A20302 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:1379°C - 1684°C
Application:Alloy structural steel
GB/T 3077 A20302 Material Chemical Composition
The chemical composition of the GB/T 3077 A20302 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 |
| Molybdenum (Mo) | - | 0.1500 |
| Manganese (Mn) | 0.5000 | 0.8000 |
| Copper (Cu) | - | 0.3000 |
| Chromium (Cr) | 0.8000 | 1.1000 |
| Carbon (C) | 0.2700 | 0.3400 |
GB/T 3077 A20302 Material Mechanical Properties
GB/T 3077 A20302 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 A20302 are slightly improved.
The mechanical properties of the GB/T 3077 A20302 steel are as follows:
| YieldRp0.2 | ≤ 678 (MPa) |
| TeileRm | ≤ 463 (MPa) |
| ImpactKV/Ku | 41(J) |
| ElongationA | 33% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 114 |
GB/T 3077 A20302 Material Thermal Properties
The thermal performance parameters of the GB/T 3077 A20302 steel are as follows:
| Temperature (°C) | 24 | 911 | 585 |
| Modulus of elasticity (GPa) | - | 513 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 34.3 | 23.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.21 | - | - |
| Deity (kg/dm³) | - | - | 442 |
| Poisson’s coefficient, ν | - | - | 122 |
GB/T 3077 A20302 Material Machining Technology
GB/T 3077 A20302 is an excellent choice for creating components and parts that require high strength, superior performance, and long service life. This steel offers a good combination of mechanical and physical properties with excellent weldability and machinability, especially when compared to other Chinese structural steels. With its cost and performance advantages, GB/T 3077 A20302 makes an ideal choice for a wide range of applications.