In the steel rolling production line, hot rolling can destroy the cast structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved.
After hot rolling, the non-metallic inclusions inside the steel are pressed into thin sheets, resulting in delamination. Delamination greatly deteriorates the tensile properties of the steel through the thickness, and there is the potential for interlaminar tearing as the weld shrinks.
The hot-rolled section steel of various sections has residual stress. Generally, the larger the section size of the section steel, the greater the residual stress. Although the residual stress is self-balanced, it still has a certain influence on the performance of the steel member under the action of external force.
Therefore, when choosing a rolling mill, we should pay attention to the quality of the equipment.
Of course, many users are primarily concerned with price, but they also need to take into account the quality of the device as much as possible.
If possible, it is better to go to the manufacturer of the rolling mill for on-site viewing and consideration, so that you can not only see the production technology of the equipment manufacturer but also ensure that the purchased equipment can be put into use.
The purchased new rolling mill equipment also needs to abide by the relevant requirements when it is installed. There are also many differences between different rolling mill equipment, so it is necessary to read the operation and installation instructions of the equipment carefully before installation.
In particular, the electronic control system needs special attention when it is installed. Because the general process of the rolling line is longer, the height difference between the equipment and the center line requirements is strict.
In addition, in the installation operation, it is also necessary to select a suitable installation position. If the equipment on the rolling line is installed on a fragile foundation, the uneven settlement and displacement of the equipment also need to be considered.
This is also the reason why the central target plate, the reference point, and the settlement observation points on the basis of the rolling mill should be buried before the equipment is installed, and the measurement should be carried out regularly. Only after the settlement and displacement become stable can the equipment be adjusted accurately.
In addition, in the work of the rolling mill, due to the large load, special attention should be paid to the selection of suitable roll bearings. Under normal circumstances, the mechanical function of the hot rolling mill is better than that of the rolling mill, and the function of the steel is naturally better.
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