EP 4071261 A4 20240619 - NORMALIZING HEAT TREATED STEEL SHEET HAVING GOOD LOW IMPACT TOUGHNESS AND METHOD FOR MANUFACTURING SAME
Title (en)
NORMALIZING HEAT TREATED STEEL SHEET HAVING GOOD LOW IMPACT TOUGHNESS AND METHOD FOR MANUFACTURING SAME
Title (de)
NORMALISIERENDES WÄRMEBEHANDELTES STAHLBLECH, DAS EINE GUTE KERBSCHLAGZÄHIGKEIT AUFWEIST, UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER TRAITÉE THERMIQUEMENT PAR NORMALISATION AYANT UNE BONNE RÉSISTANCE AUX CHOCS FAIBLES ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- KR 20190162011 A 20191206
- KR 2020017125 W 20201127
Abstract (en)
[origin: EP4071261A1] A normalizing heat treated steel sheet having good low impact toughness and a method for manufacturing the same are provided. The normalizing heat treated steel sheet of the present invention contains, by weight %, C: 0.04 to 0.1%, Si: 0.05 to 0.5%, Mn: 1.0 to 2.0%, Sol.Al: 0.015 to 0.04%, Nb: 0.003 to 0.03%, Ti: 0.005 to 0.02%, Cu: 0.35% or less, Ni: 0.05 to 0.8%, N: 0.002 to 0.008%, P: 0.01% or less (excluding 0%), S: 0.003% or less, and the balance of Fe and unavoidable impurities, and has a steel microstructure consisting of 70 to 90 area% of polygonal ferrite having a grain size of 20 µm or less, and 10 to 30 area% of spheroidized pearlite.
IPC 8 full level
C22C 38/04 (2006.01); C21D 1/18 (2006.01); C21D 1/28 (2006.01); C21D 1/56 (2006.01); C21D 1/60 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01)
CPC (source: EP KR US)
C21D 1/18 (2013.01 - EP); C21D 1/28 (2013.01 - EP US); C21D 1/56 (2013.01 - EP); C21D 1/60 (2013.01 - EP); C21D 6/001 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP US); C21D 8/021 (2013.01 - EP); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0247 (2013.01 - EP); C21D 8/0263 (2013.01 - EP KR US); C21D 8/0273 (2013.01 - KR); C21D 9/46 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - EP KR US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP KR US); C22C 38/16 (2013.01 - EP KR US); C21D 2211/005 (2013.01 - EP US); C21D 2211/009 (2013.01 - EP US)
Citation (search report)
- [XA] US 2019093204 A1 20190328 - LEE HAK-CHEOL [KR], et al
- [XA] CN 106086650 A 20161109 - JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
- [XA] WO 2014041996 A1 20140320 - KOBE STEEL LTD [JP]
- [A] WO 2019074236 A1 20190418 - POSCO [KR]
- [A] CN 102304670 A 20120104 - SHOUGANG CO LTD
- [A] KR 20090069872 A 20090701 - POSCO [KR]
- [A] KR 20110060449 A 20110608 - POSCO [KR]
- [A] KR 20120074638 A 20120706 - POSCO [KR]
- See also references of WO 2021112503A1
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
DOCDB simple family (publication)
EP 4071261 A1 20221012; EP 4071261 A4 20240619; CN 114746568 A 20220712; KR 102255822 B1 20210525; US 2022403479 A1 20221222; WO 2021112503 A1 20210610
DOCDB simple family (application)
EP 20896407 A 20201127; CN 202080083393 A 20201127; KR 20190162011 A 20191206; KR 2020017125 W 20201127; US 202017777905 A 20201127