In cold rolling of a stainless steel strip,the roll surface is colored dark brown due to thePresence material known as the roll coating. In the past,it was expected that roll coating would affect thesurface brightness of cold rolled strips and theoccurrence of heat streaks in cold rolling; however,the effect was not investigated quantitatively. In thisstudy, the effect of cold rolling conditions of aferritic SUS430 strip on roll-coating film thicknessis investigated, and the effect of the film thicknesson the surface brightness of strips and on theoccurrence of heat streaks in cold rolling is examined.The results obtained are a. follows. (1) The rollcoating is composed of iron, chromium and oxide andconsists of fine particles less than I um in size.(2)The coating film thickness is affected by reduction.rolling length, lubrication conditions, chemicalcomposition of rolling oil and roll material. (3)Surface brightness is improved slightly withincreasing film thickness. (4) The limited reductionoccurring heat streak increases slightly withincreasing roll coating film thickness , and thelimited reduction becomes almost constant in spite of increasing film thickness
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