C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 1/10 (2006.01) B22D 11/00 (2006.01) C22C 38/04 (2006.01)
Patent
CA 2147614
A cast slab comprising fine particles of oxides and MnS, said oxide comprising an Mn silicate, with Mn oxide occupying 50 to 80% by weight of the sum of Mn oxide and Si oxide, unavoidably included oxides, and an optionally added oxide of at least one member selected from Zr, Ti, Ce, Hf, Y, and Al, said oxide having a size of 0.1 to 10 µm being dispersed in an amount of 30 to 2000 pieces per mm2 of section of said cast slab. The dispersion of many oxide particles, which are likely to serve as nucli for the precipitation of MnS, in said cast slab can provide a plate steel having good toughness in a HAZ and a steel sheet product having excellent deep drawability.
L'invention concerne un métal coulé dont la teneur en très petites particules en dispersion est comprise entre 30 et 2000 particules/mm<2> de section du métal. Ces particules ont des diamètres compris entre 0,1 mu m et 10 mu m. Elles sont composées de MnS et d'oxydes composés d'un silicate de manganèse où la proportion des oxydes de manganèse varie entre 50 % et 80 % du total des oxydes de manganèse et des oxydes de silicium, d'oxydes résiduels et, le cas échéant, d'oxyde de l'un au moins des éléments suivants: Zr, Ti, Ce, Hf, Y et Al. Étant donné que le métal coulé contient une quantité importante de particules en dispersion qui interviennent déjà comme noyau dans la précipitation du MnS, il peut servir à la confection de plaques d'acier ayant un bon coefficient de dureté HAZ et à la confection de feuillard d'acier d'une excellente qualité pour l'emboutissage profond.
Mizoguchi Shozo
Sawai Takashi
Wakoh Masamitsu
Goudreau Gage Dubuc
Nippon Steel Corporation
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