Title:
HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT STRETCH FLANGEABILITY AND PRECISION PUNCHABILITY, AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/015428
Kind Code:
A1
Abstract:
A high-strength cold-rolled steel sheet having excellent stretch flangeability and precision punchability which contains given components, with the remainder comprising iron and incidental impurities. In the range of from a depth from a surface of the steel sheet which corresponds to 5/8 the sheet thickness to a depth therefrom which corresponds to 3/8 the sheet thickness, the average pole density for {100}<011> to {223}<110> orientations which are represented by the crystal orientations {100}<011>, {116}<110>, {114}<110>, {113}<110>, {112}<110>, {335}<110>, and {223}<110> is 6.5 or less and the pole density for the crystal orientation {332}<113> is 5.0 or less. The steel sheet has a metallographic structure that contains pearlite in an amount exceeding 5% in terms of areal proportion and has a total content of bainite and martensite limited to below 5% in terms of areal proportion, with the remainder comprising ferrite.
Inventors:
SHUTO HIROSHI (JP)
FUJITA NOBUHIRO (JP)
YOKOI TATSUO (JP)
OKAMOTO RIKI (JP)
NAKANO KAZUAKI (JP)
WATANABE SHINICHIRO (JP)
FUJITA NOBUHIRO (JP)
YOKOI TATSUO (JP)
OKAMOTO RIKI (JP)
NAKANO KAZUAKI (JP)
WATANABE SHINICHIRO (JP)
Application Number:
PCT/JP2012/069259
Publication Date:
January 31, 2013
Filing Date:
July 27, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
SHUTO HIROSHI (JP)
FUJITA NOBUHIRO (JP)
YOKOI TATSUO (JP)
OKAMOTO RIKI (JP)
NAKANO KAZUAKI (JP)
WATANABE SHINICHIRO (JP)
SHUTO HIROSHI (JP)
FUJITA NOBUHIRO (JP)
YOKOI TATSUO (JP)
OKAMOTO RIKI (JP)
NAKANO KAZUAKI (JP)
WATANABE SHINICHIRO (JP)
International Classes:
B21B1/26; C22C38/00; B21B3/00; C21D9/48; C22C38/06; C22C38/60
Domestic Patent References:
| WO2007015541A1 | 2007-02-08 | |||
| WO2008123366A1 | 2008-10-16 |
Foreign References:
| JP2002053935A | 2002-02-19 | |||
| JP2008189978A | 2008-08-21 | |||
| JPH032942A | 1991-01-09 | |||
| JPH0514764A | 1993-01-22 | |||
| JPH0219173A | 1990-01-23 |
Other References:
K. SUGIMOTO ET AL., ISIJ INTERNATIONAL, vol. 40, 2000, pages 920
KISHIDA, NIPPON STEEL TECHNICAL REPORT, 1999, pages 13
GENTARO,: "Cullity, Elements of X-ray Diffraction", 1986, AGNE INC., pages: 274 - 296
See also references of EP 2738274A4
KISHIDA, NIPPON STEEL TECHNICAL REPORT, 1999, pages 13
GENTARO,: "Cullity, Elements of X-ray Diffraction", 1986, AGNE INC., pages: 274 - 296
See also references of EP 2738274A4
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)
Yasushi Hagiwara (JP)
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Claims: