GB/T 700 Q235B Introduce
GB/T 700 standard specifies the general requirements for carbon structural steels. Any steels meeting the criteria of this standard can be referred to as GB/T 700 steel. GB/T 700 Q235B is widely used for manufacturing general engineering and constructional steels for various purposes including bridges, buildings and so on. These steels have a variety of chemical properties that make them unique from other types of steel.
Smelting temperature:1372°C - 1746°C
Application:Carbon structural steels
GB/T 700 Q235B Material Mechanical Properties
The yield strength of GB/T 700 Q235B steel is the amount of force that must be applied to it before it starts to yield or deform plastically. Yield strength is also referred to as the yield point or yield limit. It is measured using a yield strength test, which typically involves applying a longitudinal tensile force to a sample of material until it starts to yield or deform plastically. Generally, the yield strength of GB/T 700 Q235B steel can reach up to 300MPa.
The mechanical properties of the GB/T 700 Q235B steel are as follows:
| YieldRp0.2 | ≤ 786 (MPa) |
| TeileRm | ≤ 148 (MPa) |
| ImpactKV/Ku | 44(J) |
| ElongationA | 31% |
| Reduction in cross section on fractureZ | 11% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 322 |
GB/T 700 Q235B Material Thermal Properties
The thermal performance parameters of the GB/T 700 Q235B steel are as follows:
| Temperature (°C) | 24 | 383 | 472 |
| Modulus of elasticity (GPa) | - | 682 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 21 |
| Thermal conductivity (W/m·°C) | - | 22.3 | 32.2 |
| Specific thermal capacity (J/kg·°C) | - | 242 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.12 | - | - |
| Deity (kg/dm³) | - | - | 443 |
| Poisson’s coefficient, ν | - | - | 144 |
GB/T 700 Q235B Material Machining Technology
The machining of GB/T 700 Q235B steel involves a number of different processes. First, the material must be cut to size before it can be machined. Once it is the correct size, the material can then be drilled, reamed, and countersunk using twist drills and other cutting tools. After the holes have been drilled, reamed, and countersunk, the material can then be tapped using taps and thread cutting tools. This will allow for bolts and other types of fasteners to be used in the assembly of the finished product.