EP 1990430 B1 20110615 - High-strength hot rolled steel plate and manufacturing method thereof
Title (en)
High-strength hot rolled steel plate and manufacturing method thereof
Title (de)
Widerstandsfähige heißgewalzte Stahlplatte und Herstellungsverfahren dafür
Title (fr)
Plaque d'acier laminée à chaud haute résistance et son procédé de fabrication
Publication
Application
Priority
JP 2007108759 A 20070417
Abstract (en)
[origin: EP1990430A1] The present invention provides a new high-strength and Si-Cr containing hot rolled steel plate provided with higher strength as well as excellent workability and a method for manufacturing the steel plate. The high-strength steel plate can be obtained by controlling the particle size of prior austenite to be 10µm or less, and properly selecting the coiling temperature. The steel plate obtained includes a retained austenite phase in a volume fraction of 5% to 20%; a martensite phase in a volume fraction equal to or less than 10%; and a bainite phase in the remaining volume fraction. The particle size of the retained austenite particle is 1µm or less and the retained austenite particles are dispersed uniformly.
IPC 8 full level
C21D 8/02 (2006.01); C21D 8/04 (2006.01); C22C 38/22 (2006.01); C22C 38/44 (2006.01)
CPC (source: EP KR US)
C21D 6/002 (2013.01 - EP KR US); C21D 6/008 (2013.01 - EP KR US); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0263 (2013.01 - EP KR US); C21D 8/0426 (2013.01 - EP KR US); C21D 9/48 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP KR US); C22C 38/34 (2013.01 - KR); C22C 38/44 (2013.01 - EP KR US); C21D 2211/001 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1990430 A1 20081112; EP 1990430 B1 20110615; CN 101319295 A 20081210; CN 101319295 B 20120530; JP 2008266695 A 20081106; JP 5214905 B2 20130619; KR 101446354 B1 20141001; KR 20080093883 A 20081022; US 2009223609 A1 20090910
DOCDB simple family (application)
EP 08154615 A 20080416; CN 200810092245 A 20080417; JP 2007108759 A 20070417; KR 20080033714 A 20080411; US 7886008 A 20080407