清浄度鋼の鋳造方法

摘要

PROBLEM TO BE SOLVED: To provide a method for casting cleanliness steel excellent in fatigue resistance.;SOLUTION: A method for casting cleanliness steel comprises adding a coating material containing at least CaO, SiO₂ and Al₂O₃ into a tundish 2 of a continuous casting facility 1 upon casting cleanliness steel in the continuous casting facility 1. In the method for casting cleanliness steel, a coating material whose basicity is adjusted is added such that the basicity of a slag in the tundish 2 at an end of casting is of a value at which balance is achieved in a formula (1) or greater in accordance with an Al concentration of molten steel to be cast. 4Al+3SiO₂=3Si+2Al₂O₃...(1);SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT