EP 3239328 A1 20171101 - STEEL SHEET FOR LOW-TEMPERATURE SERVICE HAVING EXCELLENT SURFACE PROCESSING QUALITY AND METHOD FOR MANUFACTURING SAME
Title (en)
STEEL SHEET FOR LOW-TEMPERATURE SERVICE HAVING EXCELLENT SURFACE PROCESSING QUALITY AND METHOD FOR MANUFACTURING SAME
Title (de)
STAHLBLECH FÜR DEN EINSATZ BEI NIEDRIGER TEMPERATUR MIT HERVORRAGENDER OBERFLÄCHENBEARBEITUNGSQUALITÄT UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
TÔLE D'ACIER BASSE TEMPÉRATURE AYANT UNE EXCELLENTE QUALITÉ DE TRAITEMENT DE SURFACE ET PROCÉDÉ POUR LA FABRIQUER
Publication
Application
Priority
- KR 20140189137 A 20141224
- KR 2015013554 W 20151211
Abstract (en)
The present invention relates to a steel sheet for low-temperature service, which can be used at a wide temperature range from low temperature to room temperature in liquefied gas storage tanks and transport facilities, and provides: a steel sheet for low-temperature service having an excellent surface processing quality even after a processing processes is performed, such as a tension process; and a method for manufacturing the same. An aspect of the present invention relates to a steel sheet for low-temperature service having an excellent surface processing quality, the steel sheet for low-temperature service containing manganese (Mn, 15-35 wt%), carbon (C, satisfying 23. 6C + Mn ‰¥ 28 and 33.5C - Mn ‰¤ 23), copper (Cu, 5 wt% or less (excluding 0 wt%)), chrome (Cr, satisfying 28.5C + 4.4Cr ‰¤ 57 (excluding 0 wt%)), titanium (Ti, 0.01-0.5 wt%), nitrogen (N, 0.003-0.2 wt%), the balance iron (Fe), and other inevitable impurities, wherein Ti and N satisfy relational expression 1 below. [Relational expression 1] 1.0 ‰¤ Ti/N ‰¤ 4.5 (provided that, Mn, C, Cr, Ti, and N in the respective expressions mean wt% of respective ingredient contents).
IPC 8 full level
C22C 38/04 (2006.01); C21D 8/02 (2006.01); C22C 38/20 (2006.01); C22C 38/38 (2006.01)
CPC (source: CN EP KR US)
C21D 6/005 (2013.01 - EP US); C21D 8/02 (2013.01 - KR); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - CN EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - KR); C22C 38/001 (2013.01 - CN EP US); C22C 38/04 (2013.01 - KR); C22C 38/20 (2013.01 - CN EP KR US); C22C 38/28 (2013.01 - CN EP US); C22C 38/38 (2013.01 - CN EP KR US); C21D 2211/001 (2013.01 - CN EP US); C21D 2211/004 (2013.01 - CN EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3239328 A1 20171101; EP 3239328 A4 20171213; EP 3239328 B1 20211117; CA 2970151 A1 20160630; CA 2970151 C 20210119; CN 107109602 A 20170829; CN 107109602 B 20220225; JP 2018503742 A 20180208; JP 2020002465 A 20200109; JP 6764510 B2 20200930; JP 6810691 B2 20210106; KR 101665821 B1 20161013; KR 20160078853 A 20160705; US 2017362675 A1 20171221; WO 2016105002 A1 20160630; WO 2016105002 A8 20161215
DOCDB simple family (application)
EP 15873529 A 20151211; CA 2970151 A 20151211; CN 201580070966 A 20151211; JP 2017531487 A 20151211; JP 2019142931 A 20190802; KR 20140189137 A 20141224; KR 2015013554 W 20151211; US 201515535595 A 20151211