Title:
THICK STEEL PLATE HAVING EXCELLENT LOW-TEMPERATURE STRAIN AGING IMPACT PROPERTY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/074236
Kind Code:
A1
Abstract:
The present invention relates to a thick steel plate superior in low-temperature strain aging impact properties and a manufacturing method therefor and, more particularly, to a thick steel plate that is usable as a material in ship building, marine structures, and the like and which has excellent low-temperature strain aging impact properties and a method for manufacturing the same. An embodiment of the present invention provides a thick steel plate having excellent low-temperature strain aging impact properties, the steel plate comprising, by weight: 0.04-0.1% of C; 0.05-0.4% of Si; 1.0-2.0% of Mn; 0.01% or less of P; 0.003% or less of S; 0.015-0.04% of Al; 0.005-0.02% of Ti; 0.35% or less (0 exclusive) of Cu; 0.05-0.8% of Ni; 0.003-0.03% of Nb; 0.002-0.008% of N; 0.0002-0.0050% of Ca; 0.009% or less of Cr; 0.0009% or less of Mo; and a balance of Fe and other inevitable impurities, with the microstructure thereof including 95% by area or greater of ferrite 10 μm or less in average grain size, and a manufacturing method therefor.
Inventors:
KIM WOO-GYEOM (KR)
UM KYUNG-KEUN (KR)
BANG KI-HYUN (KR)
UM KYUNG-KEUN (KR)
BANG KI-HYUN (KR)
Application Number:
PCT/KR2018/011722
Publication Date:
April 18, 2019
Filing Date:
October 04, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C21D8/02; C22C38/02; C22C38/04; C22C38/08; C22C38/14; C22C38/16; C22C38/58
Foreign References:
| JP2012229470A | 2012-11-22 | |||
| KR20170075851A | 2017-07-04 | |||
| KR20100040233A | 2010-04-19 | |||
| KR20090070485A | 2009-07-01 | |||
| KR20110130974A | 2011-12-06 |
Other References:
VK HEIKKINENJD BOYD, CANADIAN METALLURGICAL QUARTERLY, vol. 15, no. 3, 1976, pages 219
See also references of EP 3696287A4
See also references of EP 3696287A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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