Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2016/010004
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a chemical composition that contains, in terms of mass%, 0.03-0.2% C, 0.1-3.0% Mn, up to 0.10% P, up to 0.03% S, 0.2-3.0% the sum of Al and Si, more than 0% but not more than 0.01% N, and more than 0% but not more than 0.01% O, with the remainder comprising iron and impurities, and has a microstructure which consists mainly of bainite and contains a hard phase constituted of martensite and/or austenite, in an amount in terms of areal proportion of 3% or larger but less than 20%, and in which 60% or more of the grains of the hard phase present in the sheet-width central part are accounted for by ones having an aspect ratio of 3 or higher, and the hard phase present in the sheet-width central part has a rolling-direction length less than 20 μm. The sum of the X-ray random intensity ratios for the <011> orientation and <111> orientation, examined from the rolling direction, is 3.5 or greater, and the X-ray random intensity ratio for the <001> orientation, examined from the rolling direction, is 1.0 or less.
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Inventors:
SHUTO HIROSHI (JP)
YOKOI TATSUO (JP)
MAEDA DAISUKE (JP)
SAKURADA EISAKU (JP)
TOYODA TAKESHI (JP)
YOKOI TATSUO (JP)
MAEDA DAISUKE (JP)
SAKURADA EISAKU (JP)
TOYODA TAKESHI (JP)
Application Number:
PCT/JP2015/070078
Publication Date:
January 21, 2016
Filing Date:
July 13, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; B21B1/26; B21B3/00; C21D8/02; C21D9/46; C22C38/58
Domestic Patent References:
| WO2014019844A1 | 2014-02-06 |
Foreign References:
| JP2005133201A | 2005-05-26 | |||
| JP2004091924A | 2004-03-25 | |||
| JP2002309334A | 2002-10-23 |
Other References:
See also references of EP 3162908A4
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)
Yasushi Hagiwara (JP)
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