HEAT TREATMENT APPARATUS FOR STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a heat treatment apparatus which stably secures a width C to be induction-heated and a width D in which the high temperature is maintained, up to end parts even if a steel sheet is thin, when the steel sheet 20 is induction-heated with a moving system while the both ends are pulled by a sandwiching device 21 that extends over a full width.

SOLUTION: The heat treatment apparatus for the steel sheet is directed at sequentially applying induction heating and subsequent water cooling to the steel sheet 20 while moving the steel sheet in its longitudinal direction for the purpose of crystal grain refining treatment in which heat treatments for rapidly heating and subsequently rapidly cooling the steel sheet 20 are repeatedly carried out; and has a movable frame 31 which holds both ends of the steel sheet 20 in its longitudinal direction with the sandwiching device 21 and pulls the both ends with a tension-imparting member 32; a tilted table 34 which mounts the movable frame 31 thereon in a form of making the steel sheet 20 take such an attitude that the width direction is horizontal and the longitudinal direction is tilted, and moves the steel sheet 20 in the longitudinal direction by linearly moving the movable frame 31; an inductor 22 for heating the moving steel sheet; and a water spraying portion 23. The amount of water to be sprayed from the water spraying portion 23 is reduced in the vicinity of the sandwiching device 21.

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