How to use cored wire properly
Cored wire is a strip of steel wrapped in alloy powder. According to the different alloy powder, can be divided into: silicon calcium core wire, silicon manganese calcium wire, silicon calcium barium wire, barium aluminum wire, aluminum calcium wire, calcium iron wire, pure calcium wire and so on. The winding is similar in appearance to a coil. Cored wires are different from those used in the textile industry.
According to reasonable application of cored wire, good deoxidation efficiency can be achieved and the quality of steel can be improved. Of course, after the development in recent years, the type of cored wire is also developing towards 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 results when using cored wire, how to use cored wire correctly?
1. Reasonably adjust the feeding speed:
Feeding rate has a great effect on the absorption rate of CA. Too fast or too slow will lead to a decrease in absorption. When the cored wire is fed to a certain depth, it will begin to melt. The depth should be ensured to greatly affect the melting and dispersion of calcium bubbles. The static pressure of the molten steel causes it to be completely consumed before it floats to the height of the molten steel. Proper feeding rate can increase the recovery rate of calcium. If the speed is too fast, on the one hand, the steel is caused by the local production of large amounts of calcium vapour. The liquid is agitated violently, and large amounts of calcium vapour are released directly into the air. The calcium vapour, on the other hand, is too late to dissolve and float in large quantities, reducing its yield. On the contrary, if the speed is too slow, the feed depth will be insufficient and it will dissolve completely. The cored wire will float to the level of the molten steel before the molten steel and be wasted.
2. Correct selection of threading position:
The location of the cored wire also has a significant effect on the recovery of calcium. The feed point of solid cored wire should be selected in the center of the downward flow of molten steel, and as far away as possible from the bright ring of blowing argon, so that Ca can enter the gaseous or liquid state. Under the action of downward flow, the pressure is forced to drop, thus prolonging its residence time in the molten steel and making it completely absorbed by the molten steel.
