EP 1918405 A1 20080507 - Process for manufacturing steel flat products from silicon alloyed multi phase steel
Title (en)
Process for manufacturing steel flat products from silicon alloyed multi phase steel
Title (de)
Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Silizium legierten Mehrphasenstahl
Title (fr)
Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases allié en silice
Publication
Application
Priority
EP 06123141 A 20061030
Abstract (en)
The method for the production of flat steel products useful for automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of greater than 1.5 mm in a continuous process at a final hot-rolling temperature at 850-1000[deg] C, and coiling the hot-rolled strip at a coiling temperature of 450-700[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 880 MPa and a minimum breaking elongation A 8 0 of 5%. The steel forms a complex phase structure. The method for the production of flat steel products useful for automotive industry, comprises casting a steel into a cast strip having a thickness of 1-4 mm, hot-rolling the cast strip in-line into a hot-rolled strip having a thickness of greater than 1.5 mm in a continuous process at a final hot-rolling temperature at 850-1000[deg] C, and coiling the hot-rolled strip at a coiling temperature of 450-700[deg] C to obtain a hot-rolled strip, which has a minimum tensile strength R m of 880 MPa and a minimum breaking elongation A 8 0 of 5%. The steel forms a complex phase structure. The shaping degree is greater than 20%. The width of the hot-rolled strip is more than 1.600 mm. The hot-rolled strip is cold-rolled with a thickness of 0.5-1.4 mm at 750-805[deg] C to obtain a cold-rolled strip, which has a minimum tensile strength of more than 800 MPa and a minimum breaking elongation A 5 0 of 5%. The coiling temperature of the cold-rolled strip is 810-850[deg] C. The cold- or hot-rolled strip is provided with a metallic coating, which is galvanizing. The coiling temperature is 550-700[deg] C, when a minimum breaking elongation A 8 0 of the obtained hot-rolled strip is 10%. The hot-rolled temperature is 900-1000[deg] C and the coiling temperature is 450-550[deg] C, when a minimum tensile strength R m of the obtained hot-rolled strip is 1000 MPa.
Abstract (de)
Die Erfindung betrifft ein Verfahren, mit dem sich hochfeste Stahl-Flachprodukte über eine große Bandbreite von geometrischen Abmessungen bei vermindertem Herstellaufwand erzeugen lassen. Dazu wird erfindungsgemäß ein ein Mehrphasengefüge bildender Stahl, der (in Gew.-%) 0,10 - 0,15 % C, 0,80 - 1,20 % Mn, bis zu 0,030 % P, bis zu 0,004 % S, 1,10 - 1,30 % Si, 0,0 - 0,05 % Al, bis zu 0,0060 % N, 0,30 - 0,60 % Cr, 0,080 - 0,120 % Ti, 0,040 - 0,060 % Nb, 0,150 - 0,250 % Mo und als Rest Eisen und unvermeidbare Verunreinigungen enthält, zu einem gegossenen Band mit einer Dicke von 1 - 4 mm vergossen, das gegossene Band in einem kontinuierlichen Arbeitsablauf mit einem Umformgrad von mehr als 20 % in-Line bei einer im Bereich von 850 - 1000 °C liegenden Warmwalzendtemperatur zu einem Warmband mit einer Dicke von 0,5 - 3,2 mm warmgewalzt und das Warmband bei einer 450 - 700 °C betragenden Haspeltemperatur gehaspelt, so dass ein Warmband erhalten wird, dessen Zugfestigkeit R m mindestens 880 MPa bei einer Bruchdehnung A 80 von mindestens 5 % beträgt.
IPC 8 full level
C22C 38/02 (2006.01); B22D 11/00 (2006.01); B22D 11/06 (2006.01); C21D 8/04 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/18 (2006.01)
CPC (source: EP KR US)
B22D 11/001 (2013.01 - EP US); B22D 11/06 (2013.01 - KR); C21D 8/04 (2013.01 - KR); C21D 8/0415 (2013.01 - EP US); C21D 8/0426 (2013.01 - EP US); C21D 8/0436 (2013.01 - EP US); C21D 8/0473 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/12 (2013.01 - KR); C22C 38/22 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [A] EP 1396550 A1 20040310 - THYSSENKRUPP STAHL AG [DE]
- [DA] EP 1072689 A1 20010131 - USINOR [FR]
- [DA] EP 1398390 A1 20040317 - THYSSENKRUPP STAHL AG [DE]
- [A] FR 2798871 A1 20010330 - USINOR [FR]
- [A] EP 0969112 A1 20000105 - NIPPON STEEL CORP [JP]
- [A] LINDENBERG H-U ET AL: "EUROSTRIP - STATE OF THE ART OF STRIP CASTING EUROSTRIP - STAND DER TECHNIK BEIM BANDGIESSEN", STAHL UND EISEN, VERLAG STAHLEISEN, DUSSELDORF, DE, vol. 121, no. 12, 14 December 2001 (2001-12-14), pages 97 - 104, XP001103986, ISSN: 0340-4803
- [A] SENK D ET AL: "UMFORMEN UND KUEHLEN VON DIREKTGEGOSSENEM STAHLBAND IN-LINE ROLLING AND COOLING OF DIRECT CAST STEEL STRIP", STAHL UND EISEN, VERLAG STAHLEISEN, DUSSELDORF, DE, vol. 120, no. 6, 16 June 2000 (2000-06-16), pages 65 - 69, XP001118293, ISSN: 0340-4803
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 NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
EP 1918405 A1 20080507; EP 1918405 B1 20090527; AT E432375 T1 20090615; CN 101528968 A 20090909; CN 101528968 B 20130306; DE 502006003833 D1 20090709; ES 2325964 T3 20090925; JP 2010508437 A 20100318; JP 5350255 B2 20131127; KR 101461585 B1 20150223; KR 20090090303 A 20090825; PL 1918405 T3 20091030; US 2010065161 A1 20100318; WO 2008052921 A1 20080508
DOCDB simple family (application)
EP 06123141 A 20061030; AT 06123141 T 20061030; CN 200780040060 A 20071024; DE 502006003833 T 20061030; EP 2007061392 W 20071024; ES 06123141 T 20061030; JP 2009533824 A 20071024; KR 20097007487 A 20071024; PL 06123141 T 20061030; US 44762507 A 20071024