| 摘要 |
PROBLEM TO BE SOLVED: To establish a method for rolling rough shape steel which can manufacture rolled steels different in size with less grooves. SOLUTION: This method of rolling a rough shape steel piece for shape steel to manufacture a rough shape steel piece, a rolled steel for a shape steel by rolling a slab with a grooved roll, consists of a first process to make a groove into the center portion of a short side 1a on both sides of a slab 1 by means of a projection 21 of a first groove 11 of a grooved roll 3, a second process to widen and deepen the above-mentioned groove by means of a projection 22 of a second groove 12 of the grooved roll 3, and a third process to widen the groove by means of a projection 23 with two or more stepped inclined faces of a third groove 13 of the grooved roll 3.
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