Brevet : EP3187613 - TÔLE D'ACIER LAMINÉE À FROID DE RÉSISTANCE ÉLEVÉE ET SON PROCÉDÉ DE PRODUCTION
Titre
TÔLE D'ACIER LAMINÉE À FROID DE RÉSISTANCE ÉLEVÉE ET SON PROCÉDÉ DE PRODUCTION
N° et date de publication de la demande
EP3187613 - 05/07/2017
Type de la demande
A1
N° et date de dépôt
EP15867575.1 - 27/10/2015
N° et date de priorité
JP2014251449 - 12/12/2014
Classification CIB
C21D 1/28 ; C21D 6/00 ; C21D 8/02 ; C21D 8/04 ; C21D 9/46 ; C21D 9/48 ; C22C 38/00 ; C22C 38/02 ; C22C 38/04 ; C22C 38/06 ; C22C 38/08 ; C22C 38/12 ; C22C 38/14 ; C22C 38/16 ; C22C 38/18 ; C23G 1/08
Classification CPC
C22C 38/00 ; C22C 38/14 ; C22C 38/58 ; C21D 8/0226 ; C21D 8/0236 ; C21D 8/0247 ; C21D 8/0278 ; C22C 38/002 ; C22C 38/02 ; C22C 38/04 ; C22C 38/06 ; C21D 8/0405 ; C21D 8/0426 ; C21D 8/0436 ; C21D 8/0447 ; C21D 8/0463 ; C21D 8/0473 ; C21D 8/0478 ; C21D2211/002 ; C21D2211/008 ; C21D 9/48 ; C21D 1/28 ; C22C 38/18 ; C21D 9/46 ; C21D 6/001 ; C21D 6/002 ; C21D 6/005 ; C21D 6/008 ; C21D 8/0205 ; C21D 8/0263 ; C21D 8/0273 ; C22C 38/001 ; C22C 38/005 ; C22C 38/08 ; C22C 38/12 ; C22C 38/16 ; C22C 38/04 ; C21D 9/46 ; C22C 38/02 ; C22C 38/06 ; C22C 38/14 ; C21D 8/0226 ; C21D 8/0236 ; C21D 8/0247 ; C21D2211/008 ; C21D2211/005 ; C21D2211/001 ; C22C 38/14 ; C21D 8/0226 ; C21D 8/0236 ; C22C 38/002 ; C22C 38/02 ; C22C 38/04 ; C22C 38/06 ; C22C 38/00 ; C22C 38/58 ; C21D 8/0278 ; C21D 8/0247 ; C21D 8/0447 ; C21D 8/0478 ; C21D2211/008 ; C21D 8/0405 ; C21D 8/0436 ; C21D 8/0426 ; C21D 8/0473 ; C21D2211/002 ; C21D 8/0463 ; C21D 1/28 ; C22C 38/18 ; C21D 9/48 ; C21D 9/46 ; C21D 6/001 ; C21D 6/002 ; C21D 6/005 ; C21D 6/008 ; C21D 8/0205 ; C21D 8/0263 ; C21D 8/0273 ; C22C 38/001 ; C22C 38/005 ; C22C 38/08 ; C22C 38/12 ; C22C 38/16 ; C22C 38/28 ; C22C 38/32 ; C22C 38/38
Famille de brevets
US2017321297A1 ; JPWO2016092733A1 ; CN107002198A ; KR20170075796A ; MX2017007511A ; WO2016092733A1 ; EP3187613A1
Abrégé
Provided are a high-strength cold-rolled steel sheet, by solving the problems with conventional techniques, having the plural good properties (yield ratio, strength, elongation, hole expansion capability, and delayed fracturing resistance) at the same time and a method for manufacturing the steel sheet. A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 µm or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 µm or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 µm or less, in which relational expression (1) below which indicates the relationship between the volume fraction (V1) of hard phases which are different from ferrite and the volume fraction (V2) of tempered martensite is satisfied. 0.35 ‰¤ V 2 / V 1 ‰¤ 0.75
INTERVENANTS
Déposant
JFE STEEL CORPORATION - 2-3, UCHISAIWAICHO 2-CHOME CHIYODA-KU TOKYO 100-0011 - JP
Titulaire
JFE Steel Corporation - 2-3, Uchisaiwaicho 2-chome Chiyoda-ku Tokyo 100-0011 - JP
Inventeur
TAKASHIMA, Katsutoshi Tokyo 100-0011 - JP
HASEGAWA, Kohei Tokyo 100-0011 - JP
FUNAKAWA, Yoshimasa Tokyo 100-0011 - JP
Mandataire
HOFFMANN EITLE - PATENT UND RECHTSANWALTE PARTMBB ARABELLASTRASSE 30 81925 MUNCHEN - DE
STATUT EN FRANCE
Délivrance
04/09/2019
Dernière annuité payée
11/09/2023
Quantième- N° de l'annuité payée
9
Date de paiement de la prochaine annuité
31/10/2024