| 摘要 |
PROBLEM TO BE SOLVED: To reduce the surface defect of a cast slab by shallowing the depth of claws caused at the time of continuously casting without adding any process by oscillating a mold based on a specific correlation. SOLUTION: The mold for continuous casting is oscillated based on the following inequality D>a*Lnb*fcxΔTd Wherein D is the scale thickness in conversion from a removed slag thickness until a cast slab strand becomes a finish product (mm), Ln is the max. descending distance of the mold in the condition of making the drawing-out cast slab strand as the reference (mm) and (a)-(d) are constants depending on the casting condition. In the formulas I, II III, Vc is the casting velocity (mm/min), VL is the rising velocity of molten metal surface level, tc is the time of starting to satisfy the condition of Vm+ VL>Vc during oscillating the mold (min), tnr is the time satisfying Vm+VL>Vc during oscillating the mold(m), (t) is time (min), S is the mold stroke (mm), (f) is the number of oscillation (cycle/min), T is the overheat degree in the condition of making the solidus of molten steel in a tundish as the reference ( deg.C) andαis the constant (0.6-1.0).
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