| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method of a steel, with which a cast slab having good surface quality can be obtained without causing a constricted breakout, in the case of casting molten steel at 3-5 m/min. SOLUTION: In the continuous casting method for casting the molten steel having 0.05-0.18 mass % C content by using mold powder having 1000-1300 deg.αof solidified temperature, the cooling plate 2 of a mold 1 composed of a copper or a copper alloy having 2045 mmδthickness andγ(W/m2.k) thermal conductivity, is used and the liner flowing speedβof cooling water passed through a cooling water flowing passage 4 arranged at the back frame side in the cooling plate of the mold is regulated to 5-10 cm/sec, and the cast is executed under condition, in which Q value obtained from the aboveα,β,γandδsatisfies the following A formula. 4.6<=Q<=14...(A) Wherein, Q=(α×β×γ)/(δ×-104).
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