GB/T 700 Q275B Introduce
GB/T 700 is the standard set by the Chinese government to standardize steel grades. Established in 2010, the GB/T 700 standard establishes the classification, characteristics, and requirements of carbon and low-alloy steels. It stipulates requirements for all aspects of steel production, including chemical composition, mechanical, metallurgical, physical, and special tests and quality control. GB/T 700 helps to ensure that all steel products meet the same standards regardless of their source.
Smelting temperature:1414°C - 1952°C
Application:Carbon structural steels
GB/T 700 Q275B Material Mechanical Properties
GB/T 700 Q275B steel is an all-round steel used for various metal constructions in China. It has excellent mechanical properties, including yield strength, tensile strength, toughness, elongation, and even overall ductility.
The mechanical properties of the GB/T 700 Q275B steel are as follows:
| YieldRp0.2 | ≤ 742 (MPa) |
| TeileRm | ≤ 582 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 11% |
| Reduction in cross section on fractureZ | 23% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 243 |
GB/T 700 Q275B Material Thermal Properties
The thermal performance parameters of the GB/T 700 Q275B steel are as follows:
| Temperature (°C) | 33 | 986 | 797 |
| Modulus of elasticity (GPa) | - | 929 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 32 |
| Thermal conductivity (W/m·°C) | - | 23.3 | 13.2 |
| Specific thermal capacity (J/kg·°C) | - | 114 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.22 | - | - |
| Deity (kg/dm³) | - | - | 123 |
| Poisson’s coefficient, ν | - | - | 431 |
GB/T 700 Q275B Material Machining Technology
GB/T 700 Q275B steel is a popular standard steel grade that is suitable for machining. The machining of GB/T 700 Q275B steel involves the use of cutting tools, the application of various machining processes, and the adherence to safety measures. By following the appropriate steps and using the correct tools, it is possible to achieve good results when machining GB/T 700 Q275B steel.