摘要 |
<p>Disclosed is an agent for maintaining the surface temperature of molten steel, which is applied over the surface of molten steel that has a predetermined surface temperature. The agent for maintaining the surface temperature of molten steel contains not less than 50% by mass of a low melting point material that has a melting point lower than the surface temperature of the molten steel and less than 50% by mass of a high melting point material that has a melting point higher than the surface temperature of the molten steel, while containing 10-60% by mass of CaO, 10-70% by mass of Al2O3, 3-30% by mass of MgO and 0-10% by mass of SiO2 so that the total is not less than 70% by mass and the ratio of CaO to Al2O3, namely CaO/Al2O3 is 0.5-2.0. The agent for maintaining the surface temperature of molten steel has a melting point lower than the surface temperature of the molten steel, and is composed of a powder that contains particles having a particle diameter of 200-1000 µm in an amount of not less than 70% by mass.</p> |