A METHOD FOR GRAIN REFINING OF STEEL, AN ALLOY FOR GRAIN REFINING OF STEEL AND A METHOD FOR PRODUCING ALLOY FOR GRAIN REFINING

摘要

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, , 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 m , 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.