GB/T 16270 Q620D Introduce
GB/T 16270 Q620D Carbon and Low-alloy High-strength Structural Steel Plate is one of the most widely used steels available and belongs to a class of materials known as high strength-low alloy (HSLA) steel. It is the primary structural steel used in construction and civil engineering projects where lightweight and high strength are necessary components. GB/T 16270 Q620D Carbon and Low-alloy High-strength Structural Steel Plate is composed of several different components, including carbon, manganese, silicon, nickel, chromium, and molybdenum. All of these components interact with each other and the individual elements combine to form an incredibly strong substance.
Smelting temperature:1656°C - 1991°C
Application:Quenched and tempered steel plate for high strength structure
GB/T 16270 Q620D Material Mechanical Properties
The mechanical properties of the GB/T 16270 Q620D steel are as follows:
| YieldRp0.2 | ≤ 796 (MPa) |
| TeileRm | ≤ 663 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 21% |
| Reduction in cross section on fractureZ | 42% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 431 |
GB/T 16270 Q620D Material Thermal Properties
The thermal performance parameters of the GB/T 16270 Q620D steel are as follows:
| Temperature (°C) | 12 | 869 | 964 |
| Modulus of elasticity (GPa) | - | 815 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 23 |
| Thermal conductivity (W/m·°C) | - | 24.3 | 11.2 |
| Specific thermal capacity (J/kg·°C) | - | 232 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.14 | - | - |
| Deity (kg/dm³) | - | - | 121 |
| Poisson’s coefficient, ν | - | - | 324 |
GB/T 16270 Q620D Material Machining Technology
The manufacturing industry has a wide range of steels available for machining operations. GB/T 16270 Q620D steel is a popular structural steel used in China in the production of several machine components and structures, such as automotive parts, railway components, and building structures. Steel with its unique properties allows for great precision and accuracy in machining operations.