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Title:
ULTRA-THICK STEEL EXCELLENT IN BRITTLE CRACK ARRESTABILITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2020/111860
Kind Code:
A3
Abstract:
An ultra-thick steel excellent in brittle crack arrestability according to an aspect of the present invention comprises, by weight, C: 0.02-0.07%, Mn: 1.8-2.2%, Ni: 0.7-1.2%, Nb: 0.005-0.02%, Ti: 0.005-0.02%, Cu: 0.1-0.4%, P: 0.01% or less, S: 0.004% or less, and the balance of Fe and inevitable impurities, wherein crystal grains that have a high angle grain boundary of 15 degrees or more, as measured by EBSD, may have an average grain size of 15㎛ or less in the t/4-(3*t)/8 region (wherein t represents a thickness of the steel, the same below).

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Inventors:
LEE HAK-CHEOL (KR)
Application Number:
PCT/KR2019/016702
Publication Date:
August 06, 2020
Filing Date:
November 29, 2019
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C22C38/04; C21D8/02; C22C38/08; C22C38/12; C22C38/14; C22C38/16
Foreign References:
KR20110075321A2011-07-06
KR20160078928A2016-07-05
KR20160078927A2016-07-05
KR20160078926A2016-07-05
JP2013245360A2013-12-09
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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