Global Patent Index - EP 1559797 B1

EP 1559797 B1 20130605 - 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

EP 1559797 B1 20130605 (EN)

Application

EP 05001139 A 20050120

Priority

  • JP 2004020843 A 20040129
  • JP 2004326545 A 20041110

Abstract (en)

[origin: EP1559797A1] 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 8 full level

B21B 1/26 (2006.01); C21D 8/02 (2006.01); B21B 1/46 (2006.01); B21B 3/00 (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)

C21D 8/0263 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C21D 8/0226 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01)

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