Firstly, it is beneficial to adjust and control the content of oxidisable elements and trace elements, which can greatly improve the alloy yield, reduce the smelting cost, shorten the smelting time and precisely control the composition.
Secondly, it plays the role of purifying steel and partly changing the nature and form of inclusions, improving the quality of steel and casting condition.
Third, the core line is divided into two kinds of internal pumping type and external release type, the mechanical equipment required to feed the line is simple and reliable, covers an area of less, especially the internal pumping type core line is more adaptable to the use of the site of narrow places.
