RECESSED PART FORMING METHOD FOR COOLING ROLL OF THIN SLAB CASTING MACHINE

摘要

PROBLEM TO BE SOLVED: To extend life of a roll and prevent generation of crack of a slab by efficiently arranging recessed parts of prescribed depth on the peripheral face of a cooling roll of a continuous casting machine to produce a thin slab and preventing deformation and wear of recessed parts. SOLUTION: A Ni layer 6 is formed on the peripheral face of an outer cylinder part 1A of a cooling roll for continuous casting machine to produce a thin slab, recessed parts (d) having 10-50μm average depth are formed by executing shot blast to the Ni layer 6. Electroplating treatment is applied on the surface subjected to shot blast, because electric potential is concentrated at the projecting parts (t) of shot blast treated surface, a plating thickness at the projecting parts (t) is turned to thicker than that of the recessed parts (d). At this time, in case a plating thickness is set to 10-500μm, an average depth of the recessed parts (d) is made to 30-159μm.