抄録
In order to improve cooling and supporting of slab strand just after the exit of mold in higher casting speed, a double stage mold which consits of indirect cooling zone through cupper plate and direct cooling zone by high speed water film was designed. The efficiency of the mold was tested on the experimental continuous casting machine with 0.17 mass% carbon steel. The size of slab was 240mm in width and 80mm in thicness. The solidified shell temperature of the strand was measured in casing, and then, heat transfer coefficients between the strand surface and the water film were estimated at the temperature more than 1273K.
Conseqently, it was found that the cooling efficiency of high speed water film was much higher than that of conventional spray cooling.
The surface of the cast slab was smooth and has no defects, even through the intensive cooling by high speed water film.
