EP 0748874 A1 19961218 - Multiphase steel, manufacturing of rolled products, and its use
Title (en)
Multiphase steel, manufacturing of rolled products, and its use
Title (de)
Mehrphasiger Stahl, Erzeugung von Walzprodukten und Verwendung des Stahls
Title (fr)
Acier à plusieurs phases, fabrication de produits laminés, et son utilisation
Publication
Application
Priority
- DE 19521836 A 19950616
- DE 19605697 A 19960216
Abstract (en)
A novel multiphase steel has the compsn. (by wt.) 0.12-0.3% C, 1.2-3.5% Mn, 1.1-2.2% Al, less than 0.2% Si, balance Fe and impurities (including P and S) and has a pearlitic structure consisting of up to 70 vol.% soft polygonal ferrite and balance bainitic ferrite and more than 4 (pref. up to 20) vol.% carbon-enriched residual austenite, opt. with smaller amounts of carbon-enriched martensite. The Al content is less than 7.6 x Ce, where Ce (carbon equivalent) = %C + 1 divided by 20 x %Mn + 1 divided by 20 x %Cr + 1 divided by 15 x %Mo = 0.2 to 0.325. Also claimed is the prodn. of rolled products of the above steel.
Abstract (de)
Die Erfindung betrifft einen Dualphasenstahl mit überwiegend ferritischem Gefüge, in dem eine kohlenstoffreiche perlitfreie harte zweite Phase eingelagert ist, die überwiegend aus Martensit besteht, mit hoher Festigkeit und guter Umformbarkeit sowie verbesserter Oberflächenqualität nach einer Warmverformung sowie ein Verfahren zu seiner Herstellung.
IPC 1-7
IPC 8 full level
C21D 8/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC (source: EP)
C21D 8/0226 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)
Citation (search report)
- [A] BE 899253 A 19840716 - GIELEN PAUL M E L
- [A] FR 2253841 A1 19750704 - CENTRO SPERIMENT METALLURG [IT]
- [A] US 4316753 A 19820223 - KANEKO KUNISHIGE, et al
- [A] EP 0586704 A1 19940316 - NIPPON STEEL CORP [JP]
- [PX] US 5470529 A 19951128 - NOMURA SHIGEKI [JP], et al
- [X] PATENT ABSTRACTS OF JAPAN vol. 018, no. 668 (C - 1289) 16 December 1994 (1994-12-16)
- [X] PATENT ABSTRACTS OF JAPAN vol. 017, no. 373 (C - 1083) 14 July 1993 (1993-07-14)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0748874 A1 19961218; AR 002502 A1 19980325; BR 9608969 A 19990629; CA 2224813 A1 19970103; CN 1190998 A 19980819; CZ 402697 A3 19980617; HU P9801755 A2 19981130; HU P9801755 A3 19990928; MX 9710229 A 19980329; PL 324556 A1 19980608; TR 199701721 T1 19980421; WO 9700331 A1 19970103
DOCDB simple family (application)
EP 96107885 A 19960517; AR 10318296 A 19960614; BR 9608969 A 19960601; CA 2224813 A 19960601; CN 96195602 A 19960601; CZ 402697 A 19960601; EP 9602382 W 19960601; HU P9801755 A 19960601; MX 9710229 A 19960601; PL 32455696 A 19960601; TR 9701721 T 19960601