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包芯线技术是把欲加合金加工成粉，用折叠咬口方式用带钢将合金粉剂包覆成密封性能好、又有一定刚度的包芯线，根据需要卷成一定重量的包芯线卷，由喂线机通过导管将包芯线插入浇包底部，使其在底部熔化以保证合金粉剂与金属液充分接触反应，提高合金的收得率。目前该技术主要用于钢液深脱硫、改变钢中夹杂物的形态、钢的微合金化及成分微调，铸造生产中对铁液的镁处理、合金化及孕育处理。
Cored wire technology is to be added to the processing of gold into powder, with the way to fold the mouth with a strip of alloy powder coated with good sealing performance, there is a certain stiffness of the cored wire, according to the need to roll into a certain weight of the cored wire Volume by the feeder line through the catheter core wire into the ladle at the bottom to melt at the bottom to ensure that the alloy powder and metal contact with the full reaction to improve the yield of the alloy. At present, the technology is mainly used for deep desulfurization of molten steel, changing the morphology of inclusions in steel, micro-alloying of steel and fine-tuning of components, magnesium treatment, alloying and inoculation of molten iron in casting production.