Method for grain refining of steel, grain refining alloy for...

C - Chemistry – Metallurgy – 21 – C

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C21C 7/00 (2006.01) B22D 11/04 (2006.01) B22D 27/20 (2006.01)

Patent

CA 2398449

The present invention relates to a method for grain refining of steel. A grain refining alloy having a composition FeXY where X is one or more elements selected from the group consisting of Cr, Mn, Si, Ni, and Mo and where Y is one or more oxide and/or sulphide and/or nitride and/or carbide forming elements selected from the group consisting of Ce, La, Nd, Pr, Ti, Al, Zr, Ca, Ba, Sr, Mg, C and N where X is between 0.001 and 99 % by weight based on the weight of the alloy and where Y is between 0.001 and 50 % by weight of the alloy, said alloy additionally containing between 0.001 and 2 % by weight of oxygen and/or between 0.001 and 2 % by weight of sulphur, said alloy containing at least 103 inclusion particles per mm3 consisting of oxides and/or sulphides and/or carbides and/or nitrides of one or more of the Y elements and/or one or more of the X elements Cr, Mn and Si in addition to Fe, said inclusion particles having a mean diameter of less than 10 µm, is added to molten steel in an amount of between 0.01 and 5 % by weight based on the weight of the steel, whereafter the steel is cast. The invention further relates to a grain refining alloy for steel and to a method for producing grain refining alloys.

La présente invention concerne un procédé d'affinage de grains d'acier. Un alliage d'affinage de grains est doté d'une composition FeXY, où X représente au moins un élément sélectionné parmi le groupe renfermant Cr, Mn, Si, Ni, et Mo, et Y représente au moins un oxyde et/ou un sulfure et/ou un nitrure et/ou un carbure formant des éléments sélectionnés parmi le groupe contenant Ce, La, Nd, Pr, Ti, Al, Zr, Ca, Ba, Sr, Mg, C et N, X est compris entre 0,001 et 99 % en poids en fonction du poids de l'alliage et Y est compris entre 0,001 et 50 % en poids de l'alliage, ledit alliage renfermant facultativement entre 0,001 et 2 % en poids d'oxygène et/ou entre 0,001 et 2 % en poids de sulfure, ledit alliage renfermant au moins 10<3> particules d'inclusion par mm<3> qui sont des oxydes et/ou des sulfures et/ou des carbures et/ou des nitrures d'au moins un des éléments Y et/ou d'au moins un des éléments X Cr, Mn et Si en plus de Fe, les particules d'inclusion ayant un diamètre inférieur à 10 mu m. Cet alliage est ajouté à l'acier fondu en une quantité comprise entre 0,01 et 5 % en poids en fonction du poids de l'acier, puis l'acier est coulé. Ladite invention concerne aussi un alliage d'affinage de grains destiné à l'acier et un procédé de production desdits alliages.

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