EP 3395997 A4 20181107 - LOW-YIELD-RATIO TYPE HIGH-STRENGTH STEEL, AND MANUFACTURING METHOD THEREFOR
Title (en)
LOW-YIELD-RATIO TYPE HIGH-STRENGTH STEEL, AND MANUFACTURING METHOD THEREFOR
Title (de)
HOCHFESTER STAHL MIT NIEDRIGEM STRECKGRENZENVERHÄLTNIS UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER À HAUTE RÉSISTANCE DE TYPE À FAIBLE RAPPORT D'ÉLASTICITÉ ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- KR 20150186522 A 20151224
- KR 2016014135 W 20161202
Abstract (en)
[origin: EP3395997A1] One aspect of the present invention relates to a low-yield-ratio type high-strength steel comprising 0.02-0.11 wt% of carbon (C), 0.1-0.5 wt% of silicon (Si), 1.5-2.5 wt% of manganese (Mn), 0.01-0.06 wt% of aluminum (Al), 0.1-0.6 wt% of nickel (Ni), 0.01-0.03 wt% of titanium (Ti), 0.005-0.08 wt% of niobium (Nb), 0.1-0.5 wt% of chromium (Cr), 0.01 wt% or less of phosphorus (P) (excluding 0 wt%), 0.01 wt% or less of sulfur (S) (excluding 0 wt%), 5-30 weight ppm of boron (B), 20-70 weight ppm of nitrogen (N), 50 weight ppm or less of calcium (Ca) (excluding 0 weight ppm), 5-50 weight ppm or less of tin (Sn) (excluding 0 weight ppm), and the remainder being iron (Fe) and other inevitable impurities.
IPC 8 full level
C22C 38/58 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C21D 8/02 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/008 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [XI] KR 20150002958 A 20150108 - HYUNDAI STEEL CO [KR]
- [A] WO 2008054166 A1 20080508 - POSCO [KR], et al
- [A] KR 20090052950 A 20090527 - POSCO [KR]
- [A] KR 20150074968 A 20150702 - POSCO [KR]
- [AD] JP S5597425 A 19800724 - NIPPON KOKAN KK
- [A] EP 2700728 A1 20140226 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
- [A] WO 2014171062 A1 20141023 - JFE STEEL CORP [JP]
- [A] JP H0551694 A 19930302 - NIPPON KOKAN KK
- See references of WO 2017111345A1
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 3395997 A1 20181031; EP 3395997 A4 20181107; EP 3395997 B1 20200902; CN 108474090 A 20180831; CN 108474090 B 20210212; JP 2019504199 A 20190214; JP 6845855 B2 20210324; KR 102348539 B1 20220107; KR 20170076912 A 20170705; US 2018371590 A1 20181227; WO 2017111345 A1 20170629
DOCDB simple family (application)
EP 16879212 A 20161202; CN 201680075889 A 20161202; JP 2018532049 A 20161202; KR 20150186522 A 20151224; KR 2016014135 W 20161202; US 201616063985 A 20161202