Various models can be customized. 1. It is beneficial to adjust and control the content of easily oxidizable elements and trace elements, reduce smelting cost, shorten smelting time, and accurately control the content of ingredients. 2. It can purify molten steel and partially change the nature and shape of inclusions, and improve the quality and casting state of molten steel. 3. Use the cored wire to process the molten steel, the alloy elements react smoothly in the molten steel, which can avoid secondary oxidation. After the reaction, the floating rate of the inclusions is fast, and the purification treatment effect is uniform. 4. The use of cored wire in steelmaking or cast iron production can avoid bringing gas into molten steel.