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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/142734
Kind Code:
The present invention makes it possible to manufacture a large steel H-beam product efficiently and stably by improving production efficiency for flanges and performing flat shaping rolling on a large blank without giving rise to problems such as elongation in the direction of web height and deformation of parts corresponding to flanges. A rough rolling step has an edging rolling step for rolling material to be rolled so as to be formed into a prescribed substantially dog bone shape and a flat rolling step for rotating the material to be rolled 90° or 270° after edging rolling is completed and carrying out rolling of the web parts. Among the calibers for performing the flat rolling step, upper and lower caliber rolls for at least one caliber are provided with, in the center part of the roll body length of the upper and lower caliber rolls, a recessed part that forms a protrusion in the center of the web part of the material to be rolled. The width of the protrusion formed in the flat rolling step is set at 25 – 50% of the inside dimension of the web part of the material to be rolled, and the thickness of the web part rolled in the flat rolling step is set to a prescribed thickness that is thicker than the web part thickness at the start of an intermediate rolling step.

YAMASHITA, Hiroshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
Publication Date:
July 25, 2019
Filing Date:
January 11, 2019
Export Citation:
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NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
B21B1/08; B21B1/088
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (Akebono International, Kakubari Building 1-20, Sumiyoshi-cho, Shinjuku-k, Tokyo 65, 〒1620065, JP)
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