Abstract
The mean lengths of ferrite grains and pearlite colonies were measured quantitatively under a microscope, in the main direction of rolling in cold-rolled low-carbon steel sheets. These mean values measured were always smaller than the values estimated from the external shapes of the sheets. This means that the mean deformation of the grains and the colonies was not similar to that of the shape of the sheet. From this result, we conclude that the pearlite colonies and the ferrite grains were split into smaller ones by cold-rolling. This split of a ferrite grain was always larger than that of a pearlite colony, for example, at 53.1% reduction of thickness a grain and a colony split into 3.8 grains and 2.4 colonies on the average, respectively.
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