Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2016/010005
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a chemical composition that comprises, by mass%, 0.03%-0.2% of C, 0.1%-3.0% of Mn, 0.10% or less of P, 0.03% or less of S, 0.2%-3.0% of Al + Si, more than 0% but 0.01% or less of N, and more than 0% but 0.01% or less of O, the remainder being iron and impurities. The microstructure of the hot-rolled steel sheet is such that: the main constituent is ferrite; the area fraction of hard phases that comprises martensite and/or austenite is 3% or more but less than 20%; 60% or more of hard phases that exist in a sheet-thickness central portion have an aspect ratio of 3 or more; the rolling-direction length of the hard phases that exist in the sheet-thickness central portion is less than 20 μm; the average aspect ratio of ferrite particles is less than 5; the sum of the x-ray random intensity ratios of the <011> direction and of the <111> direction as seen from the rolling direction is 3.5 or more; and the x-ray random intensity ratio of the <001> direction as seen from the rolling direction is 1.0 or less.
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/JP2015/070079
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:
| JP2011052293A | 2011-03-17 | |||
| JP2009024227A | 2009-02-05 | |||
| JP2004256836A | 2004-09-16 | |||
| JP2004091924A | 2004-03-25 | |||
| JPH1150197A | 1999-02-23 |
Other References:
See also references of EP 3153598A4
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
Yasushi Hagiwara (JP)
Yasushi Hagiwara (JP)
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