Title:
HIGH STRENGTH STEEL SHEET HAVING EXCELLENT HIGH-TEMPERATURE ELONGATION CHARACTERISTIC, WARM-PRESSED MEMBER, AND MANUFACTURING METHODS FOR SAME SHEET AND SAME MEMBER
Document Type and Number:
WIPO Patent Application WO/2018/117523
Kind Code:
A1
Abstract:
An aspect of the present invention relates to a high strength steel sheet having an excellent high-temperature elongation characteristic, wherein the sheet comprises, by weight %, 0.4-0.9% of C, 0.01-1.5% of Cr, 0.03% or less (exclusive of 0%) of P, 0.01% or less (exclusive of 0%) of S, 0.01% or less (exclusive of 0%) of N, 0.01% or less (exclusive of 0%) of sol. Al, and a balance of Fe and inevitable impurities, and comprises at least one among 2.1% or less (exclusive of 0%) of Mn and 1.6% or less (exclusive of 0%) of Si; the sheet has a microcrystalline structure including perlite having an area fraction of 80% or more and ferrite having an area fraction of 20% or less; and the perlite includes cementite having a major axis length of 200 nm or shorter.
Inventors:
LEE JE-WOONG (KR)
HAN SANG-HO (KR)
HAN SANG-HO (KR)
Application Number:
PCT/KR2017/014582
Publication Date:
June 28, 2018
Filing Date:
December 12, 2017
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/18; C21D8/02; C21D9/46; C22C38/02; C22C38/04; C22C38/34; C22C38/38
Foreign References:
| JP2003286542A | 2003-10-10 | |||
| JP2004308002A | 2004-11-04 | |||
| JP2000328172A | 2000-11-28 | |||
| JP2011184758A | 2011-09-22 | |||
| JPH1161272A | 1999-03-05 | |||
| KR20070023831A | 2007-03-02 | |||
| KR20140035033A | 2014-03-21 |
Other References:
See also references of EP 3561118A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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