GB/T 3077 20CrMn Introduce
GB/T 3077 20CrMn is one of the most commonly used Chinese structural steels especially for low to medium strength applications. It is well suited for hot forming and cold forming, and it is often used for medium strength mechanical parts. Its tensile strength is from 370 to 500MPa and yield strength from 310 to 390MPa. GB/T 3077 20CrMn is widely used for the production of hot rolled steels for machine building, brakes and press components, crankshafts, gears, shafts for engines, hydraulic power units and parts for oil-field industry. It is also suitable for manufacturing heat-resistant parts, vehicle load components, shafts, and such.
Smelting temperature:1752°C - 1266°C
Application:Alloy structural steel
GB/T 3077 20CrMn Material Mechanical Properties
The mechanical properties of GB/T 3077 20CrMn steel, including its strength, ductility.
Strength: GB/T 3077 20CrMn steel is renowned for its high strength and ability to withstand loads and stresses. It has a tensile strength of over 500 MPa, and an ultimate tensile strength of 600 MPa. It's an excellent material for structures that must support heavy loads or experience frequent shock or impact.
Ductility: GB/T 3077 20CrMn steel has a high ductility and is highly malleable. It can be bent, cut, and pressed into a variety of shapes without cracking or breaking. This is critical for applications such as auto body parts and construction components, where the steel must be able to withstand constant mechanical stress without becoming brittle.
The mechanical properties of the GB/T 3077 20CrMn steel are as follows:
| YieldRp0.2 | ≤ 764 (MPa) |
| TeileRm | ≤ 896 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 44% |
| Reduction in cross section on fractureZ | 13% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 223 |
GB/T 3077 20CrMn Material Thermal Properties
The thermal performance parameters of the GB/T 3077 20CrMn steel are as follows:
| Temperature (°C) | 13 | 958 | 532 |
| Modulus of elasticity (GPa) | - | 921 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 12 |
| Thermal conductivity (W/m·°C) | - | 12.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 141 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.43 | - | - |
| Deity (kg/dm³) | - | - | 422 |
| Poisson’s coefficient, ν | - | - | 311 |
GB/T 3077 20CrMn Material Machining Technology
GB/T 3077 20CrMn 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 20CrMn makes an ideal choice for a wide range of applications.