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Title:
SOUR-RESISTANT HEAVY-WALLED STEEL MATERIAL HAVING EXCELLENT LOW-TEMPERATURE TOUGHNESS AND POST-HEAT TREATMENT CHARACTERISTICS AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2018/117450
Kind Code:
A1
Abstract:
Provided are: a SOUR-resistant heavy-walled steel material having excellent low-temperature toughness and post-heat treatment characteristics; and a method for manufacturing the same. The SOUR-resistant heavy-walled steel material of the present invention comprises: in terms of weight%, 0.02-0.06% of C; 0.5% or less of Si (excluding 0%); 0.8-2.0% of Mn; 0.03% or less of P; 0.003% or less of S; 0.06% or less of Al; 0.01% or less of N; 0.005-0.1% of Nb; 0.005-0.05% of Ti; 0.0005-0.005% of Ca; one or more selected from 0.05-0.5% of Ni, 0.05-0.5% of Cr, 0.02-0.4% of Mo, and 0.005-0.1% of V; and the remainder Fe and unavoidable impurities, wherein the heavy-walled steel material satisfies relational expressions 1-3, and has a percent ductile fracture of 85% or more in the drop weight tear test (DWTT) at -20°C.

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Inventors:
KOH SEONG-UNG (KR)
PARK JAE-HYUN (KR)
BAE MOO-JONG (KR)
Application Number:
PCT/KR2017/013553
Publication Date:
June 28, 2018
Filing Date:
November 24, 2017
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C22C38/44; C21D8/02; C21D9/46; C22C38/00; C22C38/02; C22C38/06; C22C38/46; C22C38/48; C22C38/50; C22C38/58
Foreign References:
KR20160077392A2016-07-04
KR20120011292A2012-02-07
KR20150073024A2015-06-30
KR100660230B12006-12-21
KR20120071619A2012-07-03
Other References:
See also references of EP 3561129A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
Download PDF:
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