| 摘要 |
PROBLEM TO BE SOLVED: To improve the surface quality of a product by reducing the depth of a claw developed during continuous casting. SOLUTION: At the time of executing the casting operation by supplying molten metal into a mold for continuous casting and continuously drawing out the cast slab from the one end of the mold, the mold is oscillated according to the conditions in the following. Inequality(I): D>a+b(1/f)<0.5> +cL-dΔT. In the inequality (I), D is scale thickness conversed to the slab thickness, which is removed on the cast slab strand till becoming the finish product (mm), (a), (b), (c), (d) are fixed values depend on the casting condition (kind of steel, dimension of the cast slab, physical property of mold flux, using condition of an immersion nozzle). Further, L is expressed by formula II. Wherein, Vo is casting speed (mm/min), Vm is mold descending speed (mm/min), (to) is starting time of satisfying the condition Vm >Vc during oscillating the mold (min), (tn) is time of satisfying the condition Vm >Vc during oscillating the mold (min), (f) is number of the oscillation of the mold (cycle/min) andΔT is overheating degree based on the solidus temp. of molten metal in a tundish ( deg.C).
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