To provide a melting method of cold iron source which can preheat the cold iron source in the following charge and attain such an extremely high efficiency as not be obtained in the conventional melting equipment without particularly needing a device for carrying and supplying the cold iron source into a melting chamber, and an melting equipment thereof.
The cold iron source is melted by using a melting furnace 1 and an arc-melting equipment having a preheating shaft 2 connected with the upper part of the melting furnace. In this case, the cold iron source 3 is melted with the arc 7 wile continuously or intermittently supplying the cold iron source 3 into the preheating shaft 2 so that the cold iron source 3 holds the state of continuously existing in the melting furnace 1 and the preheating shaft 2. At this time, oxygen-containing gas is supplied into the cold iron source charging position from gas introducing holes 16 formed in plural steps in the range from molten iron surface position in the chamber of the melting furnace 1 to the upper end position of the cold iron source at the upper part of the preheating shaft 2 to burn unburning gas produced from the melting furnace 1. At the point of time when the prescribed quantity of molten steel is stored in the melting furnace 1, the molten steel is tapped under existing condition of the cold iron source 3 in the melting furnace 1 and the preheating shaft 2.
NAKAYAMA TAKESHI
TATEFUKU TERUO
MAKI TOSHIMICHI
SATO YASUHIRO
