| 摘要 |
PROBLEM TO BE SOLVED: To improve rolling efficiency by preventing bite-out of an outer face of a part corresponding to a flange part during rolling with a forming caliber when a rough shaped billet for a shaped steel with a web part and the flange part is manufactured by rolling a slab into a dog bone-shaped intermediate material with a double rolling mill and carrying out thickness reduction of a part corresponding to a web part with the forming caliber.SOLUTION: A recess having a width Wsatisfying t×1.3<W<t×1.6 and a depth Ysatisfying Δt×(1/4)<Y<B×0.2 is formed at the outer face of the part corresponding to the flange part of the intermediate material before the thickness reduction of the part corresponding to the web part of the intermediate material is carried out with the forming caliber, wherein tindicates the thickness of the billet, Δtindicates reduction amount of a web part thickness in forming caliber rolling, and B indicates the flange part width of the intermediate material. |
