AGENT FOR THE MAINTENANCE OF THE TEMPERATURE OF THE COAL COAST AND METHOD FOR THE MANAGEMENT OF THE TEMPERATURE OF THE COAL SURFACE OF FUND STEEL

摘要

Agent for maintaining the surface temperature of the molten steel and method for maintaining the surface temperature of the molten steel. This invention refers to an agent for maintaining the temperature of a surface of molten steel, which is arranged on a surface of molten steel having a predetermined temperature, the agent including: a raw material of low melting point having a melting temperature The lower than the surface temperature of the molten steel, the quantity of that low -melting raw material being no less than 50%in mass,Is a high melting point raw material having a melting temperature greater than the surface temperature of molten steel, the amount of that high melting point raw material being less than 50%in mass, and one in the range of 10 to 60%m mass, Al ~2 ~3 ~ in the range of 10 to 70 in mass, Mg in the range of 3 to 30% in mass, and SiO ~2 ~ in the range of 0 to 10% in mass, the total sum of which is no less than 70% in mass, in which the ratio of the action to Al ~2 ~3 ~ falls in the range of 0,5 to 2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, Cast steel,And no less than 70% in mass of the agent are formed of dust having a particle diameter in the range of 200 109 m to 1000 109 m.