Title:
THICK STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE IMPACT TOUGHNESS AND CTOD CHARACTERISTIC AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/117727
Kind Code:
A1
Abstract:
An aspect of the present invention relates to a thick steel plate having excellent low-temperature impact toughness and CTOD characteristics, the thick steel plate comprising, by weight %: 0.02-0.06% of C, 0.005-0.08% of Si, 1.0-2.0% of Mn, 0.01% or less of P, 0.003% or less of S, 0.001-0.01% of Al, 0.5-2.0% of Ni, 0.001-0.02% of Ti, 0.005-0.03% of Nb, 0.05-0.4% of Cu, 0.002-0.006% of N, and a balance of Fe and inevitable impurities with the proviso of satisfying the following equations, wherein the thick steel plate has a microstructure including ferrite in an amount of 95 area % or greater and a sum of MA and cementite in an amount of 2 area % or less: Equation 1: 3.0≤Mn+2Ni≤4.3 and Equation 2: 0.05≤C+Si+10Al≤0.25 (wherein element symbols each represent contents thereof by weight %).
Inventors:
KIM WOO-GYEOM (KR)
UM KYUNG-KEUN (KR)
BANG KI-HYUN (KR)
UM KYUNG-KEUN (KR)
BANG KI-HYUN (KR)
Application Number:
PCT/KR2017/015320
Publication Date:
June 28, 2018
Filing Date:
December 22, 2017
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/04; C21D1/18; C21D8/02; C21D9/46; C22C38/00; C22C38/02; C22C38/06; C22C38/08; C22C38/12; C22C38/14
Foreign References:
| KR20080040233A | 2008-05-08 | |||
| KR20090070485A | 2009-07-01 | |||
| KR20130076577A | 2013-07-08 | |||
| KR20120097162A | 2012-09-03 | |||
| US20100258219A1 | 2010-10-14 | |||
| KR20100066757A | 2010-06-18 |
Other References:
See also references of EP 3561115A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
Download PDF: