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Patent Searching and Data


Title:
LOW-TEMPERATURE STEEL PLATE HAVING EXCELLENT IMPACT TOUGHNESS, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/098483
Kind Code:
A1
Abstract:
Provided are a low-temperature steel plate having excellent impact toughness, and a method for manufacturing same, the low-temperature steel plate comprising, in wt%, 0.02-0.08% C, 6.0-7.5% Ni, 0.5-0.9% Mn, 0.03-0.15% Si, 0.02-0.3% Mo, and 0.1-0.3% Cr, and 50ppm or less of P, 10ppm or less of S, and the remainder in Fe and various unavoidable impurities, and the microstructure at1/4t (t: thickness of the steel plate) location of the steel plate comprising, in %surface area, 10-35% tempered bainite, 3-15% residual austenite, and the remainder in tempered martensite, and having granularity of 10㎛ or less of high angle grain boundaries at 15° or greater as measured by EBSD.

Inventors:
LEE HAK-CHEOL (KR)
Application Number:
KR2018/007230
Publication Date:
May 23, 2019
Filing Date:
June 26, 2018
Export Citation:
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Assignee:
POSCO (37859, KR)
International Classes:
C22C38/44; C21D1/18; C21D8/02; C22C38/02
Foreign References:
JP2008081776A2008-04-10
KR100957929B12010-05-13
KR20080038226A2008-05-02
KR20130103422A2013-09-23
JP2015086403A2015-05-07
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (06292, KR)
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