EP 4159886 A4 20240417 - ULTRAHIGH-STRENGTH DUAL-PHASE STEEL AND MANUFACTURING METHOD THEREFOR
Title (en)
ULTRAHIGH-STRENGTH DUAL-PHASE STEEL AND MANUFACTURING METHOD THEREFOR
Title (de)
ULTRAHOCHFESTER ZWEIPHASIGER STAHL UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER BIPHASÉ À ULTRA HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- CN 202010459510 A 20200527
- CN 2021095807 W 20210525
Abstract (en)
[origin: EP4159886A1] Disclosed in the present disclosure is an ultrahigh-strength dual-phase steel. The matrix structure of the ultrahigh-strength dual-phase steel is ferrite and martensite, wherein the ferrite and the martensite are evenly distributed in an island shape. The ultrahigh-strength dual-phase steel contains the following chemical elements in percentage by mass: 0.12-0.2% of C, 0.5-1.0% of Si, 2.5-3.0% of Mn, 0.02-0.05% of Al, 0.02-0.05% of Nb, 0.02-0.05% of Ti, and 0.001-0.003% of B. Further disclosed in the present disclosure is a manufacturing method for the ultrahigh-strength dual-phase steel, comprising the steps of smelting and continuous casting, hot rolling, cold rolling, annealing, tempering, and leveling. The ultrahigh-strength dual-phase steel in the present disclosure has not only good mechanical properties but also excellent delayed cracking resistance and low initial hydrogen content, and can be suitable for manufacturing of vehicle safety structural parts.
IPC 8 full level
C22C 38/04 (2006.01); C21D 1/18 (2006.01); C21D 1/25 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (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 38/12 (2006.01); C22C 38/14 (2006.01)
CPC (source: CN EP US)
C21D 1/18 (2013.01 - EP US); C21D 1/25 (2013.01 - EP); C21D 1/26 (2013.01 - EP); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - US); C21D 8/005 (2013.01 - CN); C21D 8/0205 (2013.01 - CN EP US); C21D 8/021 (2013.01 - EP); C21D 8/0226 (2013.01 - CN EP US); C21D 8/0236 (2013.01 - CN EP US); C21D 8/0242 (2013.01 - EP); C21D 8/0247 (2013.01 - CN EP); C21D 8/0263 (2013.01 - EP US); C21D 8/0278 (2013.01 - EP US); C21D 9/0081 (2013.01 - US); C21D 9/46 (2013.01 - EP); C22C 33/04 (2013.01 - CN US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - CN EP US); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - CN EP US); C22C 38/06 (2013.01 - CN EP US); C22C 38/12 (2013.01 - CN EP US); C22C 38/14 (2013.01 - CN EP US); C25D 3/22 (2013.01 - US); C25D 5/36 (2013.01 - US); C21D 2211/004 (2013.01 - EP); C21D 2211/005 (2013.01 - CN EP US); C21D 2211/008 (2013.01 - CN EP US)
Citation (search report)
- [I] US 2020115769 A1 20200416 - XUE PENG [CN], et al
- [A] CN 1940108 A 20070404 - BAOSHAN IRON & STEEL [CN]
- [A] WO 2020045220 A1 20200305 - JFE STEEL CORP [JP]
- [A] EP 2589674 A1 20130508 - JFE STEEL CORP [JP]
- [A] JP 2015113475 A 20150622 - JFE STEEL CORP
- [A] EP 3653745 A1 20200520 - JFE STEEL CORP [JP]
- [A] CN 109280857 A 20190129 - HANDAN IRON & STEEL GROUP CO LTD, et al
- See also references of WO 2021238916A1
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 4159886 A1 20230405; EP 4159886 A4 20240417; CA 3180467 A1 20211202; CN 113737087 A 20211203; CN 113737087 B 20220719; JP 2023527389 A 20230628; US 2023227930 A1 20230720; WO 2021238916 A1 20211202
DOCDB simple family (application)
EP 21813825 A 20210525; CA 3180467 A 20210525; CN 202010459510 A 20200527; CN 2021095807 W 20210525; JP 2022572701 A 20210525; US 202117927781 A 20210525