High magnesium cored wire is one of many cored wires. It is mainly used to purify steel impurities, improve the quality of molten steel, improve the casting state, improve the castability of molten steel, improve the performance of steel, and can significantly improve the recovery of alloys. Rate, reduce alloy consumption, and reduce steel-making costs. Because it is beneficial to adjust and control the content of easily oxidizable elements and trace elements, it can greatly improve the yield of the alloy, reduce the metallurgical cost, shorten the metallurgical time, and control the composition.