| 摘要 |
<p>The present invention relates to a hot rolling method and, more particularly, to a hot rolling method for preventing a defect of a cast steel piece from occurring by adjusting a speed of short balls and an amount of input short balls in a short ball throwing step of throwing short balls. The hot rolling method comprises: a hot rolling step of hot-rolling a cast steel piece; and a short ball throwing step of throwing short balls to the cast steel piece rolled in the hot rolling step while a rotation unit rotates at a speed of 1,700 rpm to 2,070 rpm. According to the present invention, it is possible to remove a scale formed on the cast steel piece in a state of preventing a surface defect of the cast steel piece from occurring by throwing the short balls at the speed described above.</p> |
