Title:
METHOD OF MANUFACTURING COLD-ROLLED STEEL SHEET
Document Type and Number:
Japanese Patent JP2010179333
Kind Code:
A
Abstract:
To provide a method of stably manufacturing a cold-rolled steel sheet with good quality by preventing a push-in flaw due to properties of an edge part of a product and trimming after cold rolling.
A pair of upper and lower circular rotary blades are pressed to a predetermined depth from the above and the below with respect to an edge part of a hot rolled steel sheet before pickling. Shearing is applied to the edge part in an unseparated state. The edge parts are separated through pinching by narrow width rolls installed at the respective edge parts and capable of pinching only the edge parts, and then pickling and cold rolling with a reduction rate of ≥30% are applied.
Inventors:
KAWAI TAKAMASA
TATENO JUNICHI
YAMADA MAKOTO
TOKUNAGA MUNEYASU
TATENO BUNGO
TATENO JUNICHI
YAMADA MAKOTO
TOKUNAGA MUNEYASU
TATENO BUNGO
Application Number:
JP2009024428A
Publication Date:
August 19, 2010
Filing Date:
February 05, 2009
Export Citation:
Assignee:
JFE STEEL CORP
International Classes:
B21B1/22; B21B15/00; B23D19/06
Attorney, Agent or Firm:
Kenichiro Ochiai
Kazuhiro Mori
Kazuhiro Mori
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