It should be based on the reasonable application of cored wire to achieve good deoxidizing efficiency and improve the quality of steel. Of course, after the development in recent years, the type of core wire is also developing in the direction of diversification. Users can choose and apply different types of cored wire according to different production requirements. So, in order to get good application effect when using cored wire, how to use cored wire correctly?
1. Reasonably adjust the speed of feeding:
The feeding speed has a great influence on the Ca absorption rate. Too fast and too slow will lead to lower absorption rate. When the core wire is fed to a certain depth, it will begin to melt. The depth should ensure that the melting and dispersion of calcium bubbles are greatly affected. The hydrostatic pressure of the steel will encourage complete consumption before it floats to the height of the steel. A proper feed rate will improve calcium recovery. If the speed is too fast, on the one hand, the steel is caused by locally generated large amounts of calcium vapor. The liquid is stirred violently and a large amount of calcium vapor is volatilized directly into the air. On the other hand, the calcium vapor is too late to dissolve and floats in large quantities, thus reducing its yield. On the contrary, if the speed is too slow, the feed depth will be insufficient and complete dissolution will be possible. The cored wire will float to the level of the molten steel and be wasted before the molten steel.
2. Correctly select the threading position:
The location of the cored wire also has a significant effect on calcium recovery. The feed point of the solid core wire should be chosen in the center of the downward flow of molten steel and as far away as possible from the bright ring of argon blowing to allow Ca to enter the gaseous or liquid state. Under the effect of downward flow, the pressure is forced to drop, which prolongs its residence time in the molten steel and allows it to be completely absorbed by the molten steel.
