GB/T 3077 40CrMo Introduce
GB/T 3077 40CrMo 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:1387°C - 1879°C
Application:Alloy structural steel
GB/T 3077 40CrMo Material Chemical Composition
The chemical composition of the GB/T 3077 40CrMo steel are as follows:
| Element | Min | Max |
|---|---|---|
| Carbon (C) | 0.3500 | 0.4500 |
| Silicon (Si) | 0.1500 | 0.4000 |
| Manganese (Mn) | 0.4000 | 0.7000 |
| PhOsphorus (P) | - | 0.0350 |
| Sulfur (S) | - | 0.0350 |
| Chromium (Cr) | 1.0000 | 1.5000 |
| Molybdenum (Mo) | 0.1500 | 0.2500 |
GB/T 3077 40CrMo Material Mechanical Properties
GB/T 3077 40CrMo 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 40CrMo are slightly improved.
The mechanical properties of the GB/T 3077 40CrMo steel are as follows:
| YieldRp0.2 | ≤ 422 (MPa) |
| TeileRm | ≤ 981 (MPa) |
| ImpactKV/Ku | 43(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 34% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 114 |
GB/T 3077 40CrMo Material Thermal Properties
The thermal performance parameters of the GB/T 3077 40CrMo steel are as follows:
| Temperature (°C) | 12 | 768 | 885 |
| Modulus of elasticity (GPa) | - | 593 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 12.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 422 |
| Poisson’s coefficient, ν | - | - | 312 |
GB/T 3077 40CrMo Material Machining Technology
When performing machining operations on GB/T 3077 40CrMo 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.