| 摘要 |
PROBLEM TO BE SOLVED: To improve the efficiency of descaling by mechanical descaling by reforming scale by executing reduction-annealing of a hot rolled steel strip before cold rolling. SOLUTION: After annealing the hot rolled steel strip in a reducing atmosphere for reducing the outer layer 1 of the scale to Fe, the hot rolled steel strip is cold-rolled, next, the scale layer is peeled off from the surface of the steel strip by brushing, spraying of high-pressure water, shot-blasting or adhesive peeling. As an annealing atmospere, the atmoshere containing >=75 vol.% H2 or the like is used. Then, since the outer layer and interfacial layer 3 of the scale is reduced to ductile metal Fe, the scale layer is peeled in a film shape from the surface of the steel strip.
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