| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-roll type straightening method for rod steel improving not only exfoliation of a scale on the surface but unevenness on the surface at two-roll straightening, and reducing the flaw noise and enabling the precise detection of the flaw in an automatic examination of the flaw on the surface by a magnetic leakage flux method. SOLUTION: When the mill scaled rod steel is straightened by a two-roll type rolling mill, bending of the rod steel is straightened, the rod steel is straightened by large roll separating force making the diameter of the rod steel thin, and the surface roughness of the rod steel is reduced. It is preferable that the amount of reduction in the diameter of the rod steel is 0.06 mm or more. Furthermore, it is preferable that the surface roughness is 30μm or less at the average of Rmax. COPYRIGHT: (C)2004,JPO
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