Method for grain refining of steel, alloy for grain refining of steel and method for producing such alloy for grain refining of steel

摘要

The present invention relates to a method for grain refining of steel wherein the method is characterized in that 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 sulfide 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 percent by weight based on the weight of the alloy and where Y is between 0.001 and 50 percent by weight of the alloy, said alloy additionally containing between 0.001 and 2 percent by weight of oxygen, said alloy containing at least 10e3 inclusion particles per mme3 consisting of oxides and/or sulfides 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 microns, is added to molten steel in an mount of between 0.01 and 5 percent by weight based on the weight of the steel when it is being cast. The invention further relates to a grain refining alloy for steel and to a method for producing grain refining alloys.