Précédent
Suivant
Brevet : EP1867737 - PROCÉDÉ DE FABRICATION D ACIER INOXYDABLE MARTENSITIQUE
Titre
PROCÉDÉ DE FABRICATION D ACIER INOXYDABLE MARTENSITIQUE
N° et date de publication de la demande
EP1867737 - 19/12/2007
Type de la demande
A1
N° et date de dépôt
EP06730188.7 - 28/03/2006
N° et date de priorité
JP2005098221 - 30/03/2005
Classification CIB
C21D 6/00 ; C21D 9/08 ; C22C 38/00 ; C22C 38/18 ; C22C 38/22 ; C22C 38/24 ; C22C 38/26
Classification CPC
C21D 1/32 ; C21D 6/002 ; C21D 9/08 ; C21D 9/085 ; C21D2211/008 ; C22C 38/02 ; C22C 38/04 ; C22C 38/18 ; C21D 1/32 ; C21D 6/002 ; C21D 9/08 ; C21D 9/085 ; C21D2211/008 ; C22C 38/02 ; C22C 38/04 ; C22C 38/18
Famille de brevets
US2011067785A1 ; AR052732A1 ; WO2006106650A1 ; CN101146917A ; EP1867737A1 ; US2008078478A1 ; BRPI0608954A2 ; RU2358020C1 ; JPWO2006106650A1
Abrégé
The occurrence of delayed fracture which is found in a hot worked martensitic stainless steel is prevented by subjecting the steel, after hot working and prior to heat treatment for hardening by quenching from a temperature of at least Ac 1 point of the steel, to preliminary softening heat treatment under such conditions that the softening parameter P defined below is at least 15,400 and the softening temperature T is lower than the Ac 1 point: T: softening temperature [K] t: duration of softening treatment [Hr]. The present invention is particularly effective for a martensitic stainless steel having a steel composition in which the amount of effective dissolved C and N (= [C* + 10N*]) where C* and N* are calculated by the following formulas is larger than 0.45: and
INTERVENANTS
Déposant
SUMITOMO METAL IND (SUMITOMO METAL INDUSTRIES, LTD.) - JP
Titulaire
NIPPON STEEL CORPORATION - 6-1, Marunouchi 2-chome, Chiyoda-ku - 100-8071 Tokyo - JP
Inventeur
MORI, NOBUYUKI, C/O SUMITOMO METAL INDUSTRIES LTD OSAKA-SHI, OSAKA 5410041 - JP
Mandataire
CABINET BEAU DE LOMENIE - 158 RUE DE L UNIVERSITE - 75340 PARIS CEDEX 07 - FR - N° Siren : 775671076
STATUT EN FRANCE
Délivrance
21/03/2012
Registre national des brevets (RNB)
08/10/2019 - N°0230340 - CD : Changement de nom, de dénomination (BOPI 2019-46)
Dernière annuité payée
13/02/2024
Quantième- N° de l'annuité payée
19
Date de paiement de la prochaine annuité
31/03/2025
