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    中频炉金属炉料熔化期有何特点？ ① 中频炉金属炉料逐渐熔化，钢液逐渐形成，钢液相对表面积很大，熔池也比较浅，非常有利于去气和非金属夹杂物去除，去除的夹杂物占总夹杂物的70％以上； ② 熔化期可以去除大部分气体，氢气可以去除70～80％，氮气可以去除60～70％，氧气可以去除30～40％； ③ 金属炉料在升温和熔化过程中，放出大量气体，使真空度降低； ④ 金属炉料在熔化过程中，坩锅壁周围金属料温度最高（尤其中下部），最先熔化，由于涡流热、辐射热、传导热的综合作用，使整个金属炉料逐渐自动下沉，钢液温度稳定。 What are the characteristics of the melting period of the metal charge of the induction melting furnace? ① The metal charge of the induction melting furnace gradually melts, and the molten steel is gradually formed. The relative surface area of the molten steel is large, and the molten pool is relatively shallow, which is very conducive to degassing and removal of non-metallic inclusions. The removed inclusions account for 70% of the total inclusions. above; ② Most gases can be removed during the melting period. Hydrogen can remove 70-80%, nitrogen can remove 60-70%, and oxygen can remove 30-40%; ③ The metal charge emits a large amount of gas during the heating and melting process, which reduces the vacuum degree; ④ In the melting process of the metal charge, the temperature of the metal material around the crucible wall is the highest (especially the middle and lower part), and is the first to melt. Due to the combined effect of eddy current heat, radiant heat, and conduction heat, the entire metal charge gradually sinks automatically, and the molten steel The temperature is stable.