POWDER FOR COVERING INGOT MOULD FOR CONTINUOUS CASTING OF STEEL, IN PARTICULAR STEELS WITH VERY LOW CARBON CONTENT

摘要

A powder for covering an ingot mould for the continuous casting of steel, in particular steels with ultra-low carbon content. The powder comprises a base powder and particles of at least one metal nitride, its free carbon content (%Cfree) being between 0 and 1 % by weight, it being produced by atomization, and having the form of granules of between 20 and 800 mu m in diameter. In one application of the invention, the nitride is silicon nitride, and its weight content (%Si3N4) is equal to: %Si3N4 = 0.5 - 0.28 x %Cfree +/- 0.10