Continuous casting mold is provided having a mold copper plate having plural separate portions filled with foreign metal formed by filling concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less or 125% or more of the mold copper plate, the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies expression (1), and the ratio of the thermal expansion coefficient αc of the mold copper plate and the thermal expansion coefficient αm of the filling metal satisfies expression (2).

0.3 HVc/HVm≦2.3   (1),

0.7≦αc/αm≦3.5   (2)

Continuous casting mold is provided having a mold copper plate having plural separate portions filled with foreign metal formed by filling concave grooves formed on the inner wall surface of the mold copper plate and having a diameter of 2 mm to 20 mm in the inner wall surface at least in the region from a meniscus to a position located 20 mm or more lower than the meniscus with the foreign metal whose thermal conductivity is 80% or less or 125% or more of the mold copper plate, the ratio of the Vickers hardness HVc of the mold copper plate to the Vickers hardness HVm of the filling metal satisfies expression (1), and the ratio of the thermal expansion coefficient αc of the mold copper plate and the thermal expansion coefficient αm of the filling metal satisfies expression (2).

0.3 HVc/HVm≦2.3   (1),

0.7≦αc/αm≦3.5   (2)

Provided are a method and a system for a slag thickness detection and a slag-adding prediction. The method includes: acquiring real-time measurement data and real-time auxiliary data of a slag point on a surface of a protective slag layer of a casting mold; calculating a real-time slag thickness value corresponding to the slag point by using the real-time measurement data and the real-time auxiliary data of the slag point; and predicting a location on the surface of the protective slag layer where a slag-adding is to be performed and a slag-adding time when the slag-adding is to be performed based on a change in the real-time slag thickness value corresponding to the slag point by taking a preset slag thickness value as a reference.

Provided are a method and a system for a slag thickness detection and a slag-adding prediction. The method includes: acquiring real-time measurement data and real-time auxiliary data of a slag point on a surface of a protective slag layer of a casting mold; calculating a real-time slag thickness value corresponding to the slag point by using the real-time measurement data and the real-time auxiliary data of the slag point; and predicting a location on the surface of the protective slag layer where a slag-adding is to be performed and a slag-adding time when the slag-adding is to be performed based on a change in the real-time slag thickness value corresponding to the slag point by taking a preset slag thickness value as a reference.

A mold flux for continuous casting has a base material composition containing 25 to 60 mass % of CaO, 15 to 45 mass % of SiO.sub.2, 5 to 25 mass % of F, 0.2 to 1.0 mass % of S, and 0 to 20 mass % of a total of Li.sub.2O, Na.sub.2O, and K.sub.2O, and in the base material composition, f(1) is 0.90 to 1.90, f(2) is 0.10 to 0.40, f(3) is 0 to 0.40, and a total of CaO, SiO.sub.2, F, S, Li.sub.2O, Na.sub.2O, and K.sub.2O is 90 to 100 mass %.

A mold flux for continuous casting has a base material composition containing 25 to 60 mass % of CaO, 15 to 45 mass % of SiO.sub.2, 5 to 25 mass % of F, 0.2 to 1.0 mass % of S, and 0 to 20 mass % of a total of Li.sub.2O, Na.sub.2O, and K.sub.2O, and in the base material composition, f(1) is 0.90 to 1.90, f(2) is 0.10 to 0.40, f(3) is 0 to 0.40, and a total of CaO, SiO.sub.2, F, S, Li.sub.2O, Na.sub.2O, and K.sub.2O is 90 to 100 mass %.

Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO.sub.2, an alkali metal oxide and a fluorine compound are contained, 1.1≦(CaO).sub.h/(SiO.sub.2).sub.h≦1.9, 0.10≦(CaF.sub.2).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(CaF.sub.2).sub.h)≦0.40 and 0≦(alkali metal fluoride).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(alkali metal fluoride).sub.h)≦0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa.Math.s.

Provided is mold flux that can prevent longitudinal cracks from forming on a surface of a slab upon continuous-casting hypo-peritectic steel, wherein CaO, SiO.sub.2, an alkali metal oxide and a fluorine compound are contained, 1.1≦(CaO).sub.h/(SiO.sub.2).sub.h≦1.9, 0.10≦(CaF.sub.2).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(CaF.sub.2).sub.h)≦0.40 and 0≦(alkali metal fluoride).sub.h/((CaO).sub.h+(SiO.sub.2).sub.h+(alkali metal fluoride).sub.h)≦0.10 are satisfied, a solidification temperature is no less than 1300° C., and viscosity at 1450° C. is no more than 0.1 Pa.Math.s.

Crystallizer for the continuous high-speed casting of a metal product (P), which has a casting cavity (13) defined by walls (14) connected to each other in correspondence with edges (15) and provided with cooling means (16).

Crystallizer for the continuous high-speed casting of a metal product (P), which has a casting cavity (13) defined by walls (14) connected to each other in correspondence with edges (15) and provided with cooling means (16).