To produce cold rolled stainless steel strip efficiently, high speed rolling is attempted in cluster type rolling mill which has small diamater work rolls, or in tandem cold rolling mill which has large diameter work rolls.
To attain the high speed rolling, surface brightness of the stainless steel strip must be improved.
In this study, the effect of micro-defects on surface brightness is examined by actual and laboratoryscale rolling mills, and mechanisms of micro-pits occurring in cold rolling are discussed.
The results obtained are as follows:
(1) The surface brightness is strongly affected by micro surface defects. The brightness improved with decreasing micro-defects.
(2) Micro surface defects are sorted to four types such as micro-pits occurred from surface roughness on the mother sheet, oil-pits formed in cold rolling, grooves formed by intergranular corrosion in pickling, and scratches due to surface roughness of roll.