Title:
METHOD OF TEMPER ROLLING OF STEEL STRIP AND PROCESS FOR MANUFACTURING HIGH TENSILE COLD ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2008/075603
Kind Code:
A1
Abstract:
Using a temper rolling equipment including at least one rolling stand equipped
with high-roughness workroll whose surface average roughness, Ra, is in the
range of 3.0 to 10.0 μm, optionally further, provided downstream of the
above rolling stand, at least one rolling stand equipped with bright roll, a steel
strip is subjected to temper rolling at a total elongation of 0.1% or higher. Consequently,
without the need of large-scale equipment and cumbersome supervision, given
elongation ratio, flatness and surface average roughness can be imparted to
even a steel sheet of 340 MPa or greater yield strength by the same level of rolling
load as that for soft materials. Furthermore, especially, there can be obtained
a high tensile cold rolled steel sheet of 0.5 to 3.0 μm Ra excelling in die
galling resistance.
Inventors:
KAWAI TAKAMASA (JP)
KIMURA YUKIO (JP)
KIMURA YUKIO (JP)
Application Number:
PCT/JP2007/073983
Publication Date:
June 26, 2008
Filing Date:
December 06, 2007
Export Citation:
Assignee:
JFE STEEL CORP (JP)
KAWAI TAKAMASA (JP)
KIMURA YUKIO (JP)
KAWAI TAKAMASA (JP)
KIMURA YUKIO (JP)
International Classes:
B21B1/22
Foreign References:
| JPH09502661A | 1997-03-18 | |||
| JP2006142343A | 2006-06-08 | |||
| JPH05154505A | 1993-06-22 | |||
| JPH105809A | 1998-01-13 | |||
| JP2006007233A | 2006-01-12 |
Other References:
See also references of EP 2098309A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION 7th Floor Yanagiya Building, 1-10, Nihonbashi 2-chome, Chuo-k, Tokyo 27, JP)
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