EP 1559797 A1 20050803 - Method for manufacturing a high strength steel sheet
Title (en)
Method for manufacturing a high strength steel sheet
Title (de)
Herstellungsverfahren für ein hochfestes Stahlblech
Title (fr)
Procédé de fabrication d'une tôle d'acier à haute résistance
Publication
Application
Priority
- JP 2004020843 A 20040129
- JP 2004326545 A 20041110
Abstract (en)
The high strength steel sheet consists essentially of 0. 05 to 0.15% C, 0.5% or less Si, 1.00 to 2.00% Mn, 0.09% or less P, 0.01% or less S, 0.005% or less N, 0.01 to 0.1% Sol.Al, and balance of Fe and inevitable impurities; and contains 60% or more polygonal ferrite by volume, and 5 to 30% martensite by volume. The steel sheet is manufactured by the steps of: casting a slab having the specified composition; hot-rolling the slab at Ar3 point or more temperature; beginning cooling the hot-rolled steel sheet within 2 seconds after completing the hot-rolling to a temperature of from 750 DEG C to 600 DEG C at a cooling rate of 150 DEG C/s or more; holding the cooled steel sheet at a temperature between 750 DEG C and 600 DEG C for 2 to 15 seconds; cooling the steel sheet at a cooling rate of 20 DEG C/s or more; and coiling the cooled steel sheet at a temperature of 400 DEG C or less. <IMAGE>
IPC 1-7
IPC 8 full level
B21B 1/26 (2006.01); B21B 1/46 (2006.01); B21B 3/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/38 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C21D 8/0263 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP KR US); C21D 8/0226 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Citation (search report)
- [X] WO 0109396 A1 20010208 - THYSSENKRUPP STAHL AG [DE], et al
- [X] WO 0055381 A1 20000921 - THYSSENKRUPP STAHL AG [DE], et al
- [X] EP 1227167 A1 20020731 - NIPPON KOKAN KK [JP]
- [X] US 5759297 A 19980602 - TERACHER PASCAL [FR], et al
- [A] EP 0072867 A1 19830302 - KAWASAKI STEEL CO [JP]
- [PX] EP 1398390 A1 20040317 - THYSSENKRUPP STAHL AG [DE]
- [AD] PATENT ABSTRACTS OF JAPAN vol. 017, no. 180 (C - 1046) 8 April 1993 (1993-04-08)
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
EP 1559797 A1 20050803; EP 1559797 B1 20130605; AU 2005200300 A1 20050818; AU 2005200300 B2 20070503; AU 2005200300 C1 20080306; CA 2493523 A1 20050729; CA 2493523 C 20090127; CN 100439542 C 20081203; CN 1648277 A 20050803; JP 2005240172 A 20050908; JP 4470701 B2 20100602; KR 100673424 B1 20070124; KR 20050077757 A 20050803; TW 200530409 A 20050916; TW I277658 B 20070401; US 2005173031 A1 20050811; US 2009223607 A1 20090910
DOCDB simple family (application)
EP 05001139 A 20050120; AU 2005200300 A 20050125; CA 2493523 A 20050121; CN 200510006313 A 20050126; JP 2004326545 A 20041110; KR 20050007363 A 20050127; TW 94102230 A 20050126; US 38651809 A 20090417; US 4099405 A 20050120