GB/T 700 Q235A Introduce
GB/T 700 Q235A carbon structural steel is a series of low-carbon steels that have been developed for a variety of industrial applications. Its goal is to provide a high grade of strength, improved weldability and formability, and better cost efficiency. GB/T 700 Q235As are typically used in applications such as bridges, roads, sailboats, and buildings.
Smelting temperature:1595°C - 1782°C
Application:Carbon structural steels
GB/T 700 Q235A Material Mechanical Properties
GB/T 700 Q235A steel also has excellent mechanical properties. Its yield strength ranges from 215MPa to 275MPa. The tensile strength ranges from 330MPa to 380MPa. This steel also has a good elongation rate of 15%-20%. GB/T 700 Q235A steels are characterized by their ductility, allowing for good formability and weld-ability. GB/T 700 Q235A steel can also be cold-formed and bolted or welded with ease.
The mechanical properties of the GB/T 700 Q235A steel are as follows:
| YieldRp0.2 | ≤ 626 (MPa) |
| TeileRm | ≤ 336 (MPa) |
| ImpactKV/Ku | 21(J) |
| ElongationA | 24% |
| Reduction in cross section on fractureZ | 12% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 143 |
GB/T 700 Q235A Material Thermal Properties
The thermal performance parameters of the GB/T 700 Q235A steel are as follows:
| Temperature (°C) | 24 | 853 | 342 |
| Modulus of elasticity (GPa) | - | 291 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 43 |
| Thermal conductivity (W/m·°C) | - | 43.3 | 43.2 |
| Specific thermal capacity (J/kg·°C) | - | 224 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.34 | - | - |
| Deity (kg/dm³) | - | - | 213 |
| Poisson’s coefficient, ν | - | - | 343 |
GB/T 700 Q235A Material Machining Technology
Machining is an important process in many industries, including the production of steel pieces. GB/T 700 Q235A steel is a well-known Chinese standard steel grade, and it has good properties for machining. In this article, we will take a look at the machining of GB/T 700 Q235A steel, including the types of cutting tools that are used, the machining processes that are involved, and the safety measures that should be taken to prevent accidents.