Patent ID: 11945027

Abstract:
In the mold powder, the content of F is 0.5% by mass or less (including 0% by mass), CaO and SiO2 are included as main components, the mass ratio of CaO to SiO2 (CaO/SiO2) is 0.6 to 1.4, the content of B2O3 is 0.3 to 2.8% by mass, the content of Na2O is 5.0 to 20.0% by mass, the total content of Li2O and K2O is 0 to 4.0% by mass, the content of MgO is 0 to 3.5% by mass, the content of Al2O3 is 1.0 to 8.0% by mass, and the content of MnO is 1.0% by mass or less (including 0% by mass).