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Patent Searching and Data


Title:
HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT YIELD RATIO, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2021/125563
Kind Code:
A1
Abstract:
Disclosed are a high-strength hot-rolled steel sheet having an excellent yield ratio and omitting post-processing, and a method for manufacturing the steel sheet. The hot-rolled steel sheet according to a disclosed embodiment comprises, in weight %, at least 0.12% and less than 0.3% of C, at most 0.5% (not including 0) of Si, 0.1 to 2.5% of Mn, 0.0005 to 0.005% of B, at most 0.02% of of P, at most 0.01% of S, and the remainder in iron (Fe) and unavoidable impurities, has a microstructure comprising at least 95 volume % of martensite, and has a yield ratio (yield strength/tensile strength) of at least 0.75, is manufactured by continuous hot-rolling, and allows post-processing with cold rolling and heat treatment to be omitted.

Inventors:
PARK KYONGSU (KR)
KIM DEUKJUNG (KR)
KIM HAK-JUN (KR)
Application Number:
PCT/KR2020/015769
Publication Date:
June 24, 2021
Filing Date:
November 11, 2020
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C21D8/02; B21B1/24; B21B3/00; C22C38/02; C22C38/04; C22C38/28
Foreign References:
JP2017057472A2017-03-23
JP2018031077A2018-03-01
JP2014201781A2014-10-27
KR20120001018A2012-01-04
KR20150046927A2015-05-04
KR20050113247A2005-12-01
JP2005298967A2005-10-27
US20050155673A12005-07-21
EP1396549A12004-03-10
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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