EP 4043603 A1 20220817 - FLAT STEEL PRODUCT AND METHOD FOR ITS PRODUCTION
Title (en)
FLAT STEEL PRODUCT AND METHOD FOR ITS PRODUCTION
Title (de)
STAHLFLACHPRODUKT UND VERFAHREN ZU SEINER HERSTELLUNG
Title (fr)
PRODUIT PLAT EN ACIER ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- EP 22159990 A 20170928
- EP 17780063 A 20170928
- EP 2017074642 W 20170928
Abstract (en)
[origin: WO2019063081A1] The invention relates to a bake hardening treatment of a suitable very high-strength flat steel product and to a method for producing such a flat steel product. The flat steel product consists of a steel that consists of (in wt%) 0.1-0.5% C, 1.0-3.0% Mn, 0.5-2.0% Si, 0.01-1.5% Al, 0.001-0.008% N, up to 0.02% P, up to 0.005% S and optionally one or more of the following elements: 0.01-1.0% Cr, 0.01-0.2% Mo, 0.001-0.01% B, and optionally a total of 0.005-0.2% V, Ti and Nb, the Ti proportion not being more than 0.10%, and, as the remainder, iron and unavoidable impurities. The flat steel product has a microstructure that consists of not more than 15 area % ferrite, not more than 5 area % bainite, at least 5 volume % residual austenite and at least 80 area % martensite, of which at least 75 area % is tempered martensite.
Abstract (de)
Die Erfindung betrifft ein für eine Bake-Hardening-Behandlung geeignetes höchstfestes Stahlflachprodukt sowie ein Verfahren zur Herstellung eines solchen Stahlflachprodukts. Das Stahlflachprodukt besteht aus einem Stahl, der aus (in Gew.-%) 0,1 - 0,5 % C, 1,0 - 3,0 % Mn, 0,5 - 2,0 % Si, 0,01 - 1,5 % Al, 0,001 - 0,008 % N, bis zu 0,02 % P, bis zu 0,005 % S sowie optional aus einem oder mehreren der folgenden Elemente 0,01 - 1,0 % Cr, 0,01 - 0,2 % Mo, 0,001 - 0,01 % B sowie optional aus in Summe 0,005 - 0,2 % V, Ti und Nb, wobei der Ti-Anteil nicht mehr als 0,10% beträgt, und als Rest Eisen und unvermeidbaren Verunreinigungen besteht, und wobei das Stahlflachprodukt ein Gefüge aufweist, das aus nicht mehr als als 15 Flächen-% Ferrit, nicht mehr als als 5 Flächen-% Bainit, mindestens 5 Volumen-% Restaustenit und mindestens 80 Flächen-% Martensit, von welchem mindestens 75 Flächen-% angelassener Martensit ist, besteht.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/22 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01); C23C 2/00 (2006.01); C23C 2/04 (2006.01); C23C 2/06 (2006.01); C23C 2/28 (2006.01); C23C 2/34 (2006.01); C23C 2/40 (2006.01); C25D 5/36 (2006.01); C25D 7/06 (2006.01)
CPC (source: EP US)
C21D 1/22 (2013.01 - EP); C21D 8/0236 (2013.01 - EP); C21D 8/0247 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/00 (2013.01 - EP); C22C 38/001 (2013.01 - EP); C22C 38/002 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/18 (2013.01 - EP); C23C 2/06 (2013.01 - EP); C23C 2/29 (2022.08 - EP US); C23C 2/40 (2013.01 - EP); C25D 5/36 (2013.01 - EP); C25D 7/0614 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 6/005 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/0436 (2013.01 - EP); C21D 8/0447 (2013.01 - EP); C21D 9/48 (2013.01 - EP); C21D 2211/001 (2013.01 - EP); C21D 2211/008 (2013.01 - EP)
Citation (applicant)
- US 2013240094 A1 20130919 - AKAMATSU SATOSHI [JP], et al
- US 2017009315 A1 20170112 - SHIBATA KOSUKE [JP], et al
Citation (search report)
- [I] JP 2016194138 A 20161117 - KOBE STEEL LTD
- [A] WO 2016177763 A1 20161110 - THYSSENKRUPP STEEL EUROPE AG [DE], et al
- [A] JP 2015224359 A 20151214 - JFE STEEL CORP
- [A] WO 2017155263 A1 20170914 - POSCO [KR]
- [A] T. FUKUSHIMA: "Recent technological progress in High speed continuous annealing", TRANSACTIONS ISIJ, vol. 25, 1 January 1985 (1985-01-01), pages 275 - 293, XP055490618
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)
WO 2019063081 A1 20190404; CN 111148853 A 20200512; CN 111148853 B 20220415; EP 3688203 A1 20200805; EP 3688203 B1 20220427; EP 4043603 A1 20220817; ES 2921013 T3 20220816; JP 2021503040 A 20210204; JP 7105302 B2 20220722; PL 3688203 T3 20220829
DOCDB simple family (application)
EP 2017074642 W 20170928; CN 201780095388 A 20170928; EP 17780063 A 20170928; EP 22159990 A 20170928; ES 17780063 T 20170928; JP 2020517460 A 20170928; PL 17780063 T 20170928