Grain Refiners for Steel-Manufacturing Methods and Use

Grain refiner material,

• characterized in that the material is in the form of a composite material comprising non-metallic particles XaOb in a metallic matrix X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and O is oxygen, wherein said material additionally containing sulphur, carbon and nitrogen and the oxygen content is between 2 and 30% by weight of said material, while the total content of sulphur, carbon and nitrogen and other elements from group X is between 98 and 70% by weight of said material.

Method for grain refinement of steel,

• characterized in that a grain refining composite material comprising a composition of non-metallic particles XaSb and a metallic matrix X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and S is sulphur, wherein said composite material additionally containing oxygen, carbon and nitrogen wherein the sulphur content is between 2 and 30% by weight of said composite material, while the total content of oxygen, carbon and nitrogen and said other elements from group X is between 98 and 70% by weight of said composite material is added to a liquid steel in an amount of between 0.05 to 5% by weight of the steel, where after the steel is cast, either continuously or batch-wise.

Method for grain refinement of steel,

• characterized in that a grain refining composite material comprising a composition of non-metallic particles XaOb and a metallic matrix X, where X is one or more elements selected from the group Ce, La, Pr, Nd, Y, Ti, Al, Zr, Ca, Ba, Sr, Mg, Si, Mn, Cr, V, B, Nb, Mo and Fe, and O is oxygen, wherein said composite material additionally containing sulphur, carbon and nitrogen and the oxygen content is between 2 and 30% by weight of said composite material, while the total content of sulphur, carbon and nitrogen and other elements from group X is between 98 and 70% by weight of said composite material is added to a liquid steel in an amount of between 0.05 to 5% by weight of the steel, whereafter the steel is cast, either continuously or batch-wise.