| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of hot-rolling a bar material for manufacturing bar-material products which satisfies severe warranty of surface defect in the late years by suppressing the generation of fine surface defects caused by rolling deformation in a hot-rolling stage of the bar material such as a wire rod, bar steel and a square material. SOLUTION: Provided is the method of hot-rolling the bar material by which a billet of a base stock is made into a required size by successively reducing the cross-sectional area by respective rolling systems by calibers provided on the rolls of a plurality of arranged rolling mills so that the compressive strain is≤0.5 in the peripheral direction of the rolled stock by the calibers of the respective rolling systems. In this way, the surface defect which becomes problems so that defects are caused by working in the succeeding working stage by the rolling deformation can not be generated and the products made of the bar material which is excellent in the surface quality which deals with the severe warranty of the surface defect in the late years can be provided. COPYRIGHT: (C)2007,JPO&INPIT
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