Super-clean steel

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/00 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01)

Patent

CA 2340688

A highly cleaned steel being excellent in cold forming property and fatigue characteristics, characterized in that, in the L cross section of a rolled steel, with respect to non-metal inclusions having a ratio of length (l) to width (d), l/d, of 5 or less, those having the composition A1 described below account for 20 number % or more, the sum of those having the composition A1 or B1 account for 80 number % or more, and non-metal inclusions having a l/d of 5 or less and the composition A1 have a d of 40 µm or less, composition A1: SiO2: 60 % or more, composition B1: SiO2: 20 to 60 %, MnO: 10 to 80 %, and further 50 % or less of CaO and/or 15 % or less of MgO are contained. The highly cleaned steel being excellent in cold forming property and fatigue characteristics can be produced by use of a reduced amount of an alloy containing Ca and/or Mg.

Cette invention concerne un acier fortement nettoyé possédant d'excellentes caractéristques en termes de formage à froid et de résistance à la fatique. Cet acier se caractérise en ce que, dans la section L d'un acier laminé, parmi les inclusions non métalliques au rapport longueur/largeur (l/d) de 5 ou moins, celles de composition A1 ci-dessous représentent 20 % en nombre ou plus, la somme de celles qui correspondent à la composition A1 ou B1 représentent 80 % en nombre ou plus, et celles qui ont un rapport l/d de 5 ou moins et correspondent à la description A1, ont une largeur d de 40µm ou moins. La composition A1 est la suivante: SiO¿2?: 60 % ou plus. La composition B1 est la suivante: SiO¿2?: 20 à 60 %, MnO: 10 à 80 %, plus 50 % ou moins de CaO et/ou 15 % ou moins de MgO. Cet acier fortement nettoyé aux excellentes caractéristiques en termes de formage à froid et de résistance à la fatigue peut être produit au moyen d'une dose réduite d'un alliage à Ca et/ou Mg.

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