| 摘要 |
PROBLEM TO BE SOLVED: To restrain sintering of mold powders and to prevent excess growth of slag rim in a casting mold.SOLUTION: There is provided the mold powder 3 for continuous casting of steel including MgO, CaO, SrO, BaO and SiOas main components and having a total main component concentration of 60 atom% or more. The base material of the mold powder 3 having the total main component concentration of 60 atom% or more contains at least one of group 2 metal carbonates such as carbonates of magnesium, calcium, strontium and barium. Total concentration of group 2 metal oxides generating by thermal decomposition of group 2 metal carbonates is controlled to be in the range of 7 to 30 atom%. SiOderived from soda-lime glass dust included in the base material is made to account for 50 mass% or more of total amount of SiOincluded in the mold powder.EFFECT: Problem accompanying slag rim thickening is remedied without taking an operation risk.SELECTED DRAWING: Figure 1 |
