Title:
STEEL MATERIAL, FOR PRESSURE VESSEL, SHOWING EXCELLENT HYDROGEN-INDUCED CRACKING RESISTANCE AND METHOD FOR PREPARING SAME
Document Type and Number:
WIPO Patent Application WO/2019/132478
Kind Code:
A1
Abstract:
An embodiment of the present invention provides a steel material, for a pressure vessel, comprising, in weight %, 0.06-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.40% of aluminum (Al), 0.010% or less of phosphorus (P), 0.0010% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), 0.01-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0050% of magnesium (Mg), 0.0005-0.0050% of calcium (Ca), 0.0020% or less of oxygen (O), and the remainder being Fe and other unavoidable impurities. A microstructure comprises in terms of area fraction 30% or less of pearlite and the remainder being ferrite. A non-metallic inclusion contains Mg-Al-Ca-O composite oxide.
Inventors:
KIM DAE-WOO (KR)
CHA WOO-YEOL (KR)
CHA WOO-YEOL (KR)
Application Number:
PCT/KR2018/016582
Publication Date:
July 04, 2019
Filing Date:
December 24, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21C7/00; C21D1/28; C21D8/02; C21D9/46; C22C38/44; C22C38/46; C22C38/48; C22C38/50
Foreign References:
| KR101709033B1 | 2017-02-21 | |||
| KR20160075925A | 2016-06-30 | |||
| KR101736638B1 | 2017-05-30 | |||
| KR20130114179A | 2013-10-16 | |||
| KR20120110324A | 2012-10-10 | |||
| KR20100076727A | 2010-07-06 | |||
| JP2003013175A | 2003-01-15 | |||
| JP2014005534A | 2014-01-16 | |||
| KR101150141B1 | 2012-06-08 |
Other References:
See also references of EP 3733892A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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