Patent ID: 8486175

Claim:
A material for grain refining of steel, wherein the material is in the form of a composite material comprising non-metallic particles X a S b in a metallic matrix X, where X is one or more elements selected from the group consisting of 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 material further comprises oxygen, carbon and nitrogen, wherein the sulphur content is between 5 and 25% by weight of said material, while the total content of oxygen, carbon and nitrogen and said other elements from group X is between 95 and 75% by weight of said material, wherein said composite material contains at least 10 7 X a S b containing particles per mm 3 of said composite material, and wherein said X a S b containing dispersion particles have a mean particle diameter d in the range from 0.2 to 5 μm and a total spread in the particle diameters from: d max <10 × d and d min >0.1 × d ( d max <50 μm, d min >0.02 μm).