| 摘要 |
PURPOSE:To obtain a titled equipment which has realized improvement of structure of a product steel plate, and elevation of a magnetic characteristic, by installing a cold rolling mill and a scale removing device to the entry of a continuous heat treatment furnace of a normalizing treatment equipment, and making the atmosphere in the continuous heat treatment furnace nonreducible. CONSTITUTION:In a normalizing treatment equipment of a hot rolling plate for an electric steel plate, which consists of a continuous heat treatment furnace 4, a scale removing device 6, a pickling tank 7, a washing tank 8, etc., a cold rolling mill 11 is installed to the entry of said continuous heat treatment furnace 4, and in succession to the base material feed device such as a payoff reel 1, a welding machine 2, a looper 3, etc., a hot rolling base plate is subjected to cold rolling by draft of 5-35%, and not only adjustment of the crystal structure is elevated but also the descaling property is improved. Also, a scale removing device 12 is installed next to the rolling mill 11 and about >=80% scale at the time of hot rolling is removed, and after that, heating is executed for about >=30sec within a temperature range of about 700-1,200 deg.C under a nonreducible atmosphere, by which and effect of the normalizing treatment is further elevated. |
