Title:
LOW-YIELD RATIO AND HIGH-STRENGTH STEEL HAVING EXCELLENT STRESS CORROSION CRACKING RESISTANCE AND LOW TEMPERATURE TOUGHNESS
Document Type and Number:
WIPO Patent Application WO/2017/111526
Kind Code:
A1
Abstract:
An aspect of the present invention relates to a low-yield ratio and high-strength steel having excellent stress corrosion cracking resistance and low temperature toughness, the steel comprising, by weight, 0.02-0.10% of carbon (C), 0.5-2.0% of manganese (Mn), 0.05-0.5% of silicon (Si), 0.05-1.0% of nickel (Ni), 0.005-0.1% of titanium (Ti), 0.005-0.5% of aluminum (Al), 0.005% or less of niobium (Nb), 0.015% or less of phosphorus (P), 0.015% or less of sulfur (S), and the balanced amount of Fe and inevitable impurities, the microstructure of which comprises, by area, 60% or more of acicular ferrite and a balanced amount of one or more phases of bainite, polygonal ferrite and martensite-austenite constituent (MA).
Inventors:
JANG SUNG-HO (KR)
LEE HAK-CHEOL (KR)
LEE HAK-CHEOL (KR)
Application Number:
PCT/KR2016/015156
Publication Date:
June 29, 2017
Filing Date:
December 23, 2016
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/14; C21D8/02; C22C38/02; C22C38/04; C22C38/06; C22C38/08; C22C38/12
Foreign References:
| JP2012107310A | 2012-06-07 | |||
| KR20110116760A | 2011-10-26 | |||
| KR20110075627A | 2011-07-06 | |||
| KR20140023787A | 2014-02-27 | |||
| KR20130110643A | 2013-10-10 | |||
| JPS63290246A | 1988-11-28 | |||
| JPS58153730A | 1983-09-12 | |||
| JPH0417613A | 1992-01-22 |
Other References:
See also references of EP 3395987A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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