EP 2009129 A1 20081231 - Process for manufacturing a galvannealed steel sheet by DFF regulation
Title (en)
Process for manufacturing a galvannealed steel sheet by DFF regulation
Title (de)
Verfahren zur Herstellung eines galvanisierten oder Galvanneal-Stahlblechs durch DFF-Regulierung
Title (fr)
Processus de fabrication d'une plaque d'acier galvanisée par régulation DFF
Publication
Application
Priority
EP 07290816 A 20070629
Abstract (en)
Technical abstract The invention deals with a process for manufacturing a hot-dip galvannealed steel sheet having a TRIP microstructure, and comprising, by % by weight, 0.01 ‰¤ C ‰¤ 0.22%, 0.50 ‰¤ Mn ‰¤ 2.0%, 0.2 ‰¤ Si ‰¤ 2.0%, 0.005 ‰¤ Al ‰¤ 2.0%, Mo < 0.01 %, Cr ‰¤ 1.0%, P < 0.02%, Ti ‰¤ 0.20%, V ‰¤ 0.40%, Ni ‰¤ 1.0%, Nb ‰¤ 0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, said process comprising the steps consisting in: - oxidizing said steel sheet in order to form a layer of iron oxide on the surface of the steel sheet, and to form an internal oxide of at least one type of oxide selected from the group consisting of Si oxide, Mn oxide, Al oxide, complex oxide comprising Si and Mn, complex oxide comprising Si and Al complex oxide comprising Al and Mn, and complex comprising Si, Mn and Al, - reducing said oxidized steel sheet in order to reduce the layer of iron oxide, - hot-dip galvanising said reduced steel sheet to form a zinc-based coated steel sheet, and - subjecting said zinc-based coated steel sheet to an alloying treatment to form a galvannealed steel sheet.
IPC 8 full level
C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01)
CPC (source: EP KR US)
C21D 1/52 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP KR US); C21D 9/561 (2013.01 - EP KR US); C22C 1/11 (2023.01 - EP KR US); C23C 2/0222 (2022.08 - EP KR US); C23C 2/0224 (2022.08 - EP KR US); C23C 2/06 (2013.01 - EP KR US); C23C 2/261 (2022.08 - KR); C23C 2/28 (2013.01 - EP US); C23C 2/40 (2013.01 - EP KR US)
Citation (search report)
- [X] BE 1014997 A3 20040803 - CT RECH METALLURGIQUES ASBL [BE]
- [A] EP 1612288 A1 20060104 - NIPPON STEEL CORP [JP], et al
- [A] US 3925579 A 19751209 - FLINCHUM CHARLES, et al
- [A] WO 2007064172 A1 20070607 - POSCO [KR], et al
- [A] US 2003047255 A1 20030313 - DELAUNAY DIDIER [FR], et al
- [A] EP 0448351 A1 19910925 - KAWASAKI STEEL CO [JP]
- [A] US 3936543 A 19760203 - BYRD FRED, et al
- [A] WO 2006061151 A1 20060615 - THYSSENKRUPP STEEL AG [DE], et al
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 2009129 A1 20081231; AR 067339 A1 20091007; AT E521726 T1 20110915; BR PI0813687 A2 20141230; BR PI0813687 A8 20151215; BR PI0813687 B1 20181030; CA 2701091 A1 20090108; CA 2701091 C 20120417; CN 101809182 A 20100818; CN 101809182 B 20150805; EP 2171116 A1 20100407; EP 2171116 B1 20110824; ES 2371985 T3 20120112; JP 2010532820 A 20101014; JP 2015078438 A 20150423; JP 5713673 B2 20150507; KR 101273308 B1 20130611; KR 20100055389 A 20100526; PL 2171116 T3 20120131; RU 2010102924 A 20110810; RU 2451107 C2 20120520; US 2010193081 A1 20100805; WO 2009004425 A1 20090108
DOCDB simple family (application)
EP 07290816 A 20070629; AR P080102782 A 20080627; AT 08762800 T 20080606; BR PI0813687 A 20080606; CA 2701091 A 20080606; CN 200880025372 A 20080606; EP 08762800 A 20080606; ES 08762800 T 20080606; IB 2008001462 W 20080606; JP 2010514160 A 20080606; JP 2014227461 A 20141107; KR 20107001332 A 20080606; PL 08762800 T 20080606; RU 2010102924 A 20080606; US 66670208 A 20080606