Experiments for studying on earing grown by deep drawing were made by use of blanks from one-way-rolled 2S sheets which were produced through following processes. Three 2S ccp slabs were pre-heated for two, five and seven hours at 500°C respectively. These slabs were rolled under the temperature of 500°C, 510°C and 520°C and then cold-rolled with the reduction rates of 73.4%, 87.1% and 92.9% respectively. Annealing temperature was changed in the range of 265°C-400°C.
From these experiments, it was found out that, compared with the ones from cross-way-rolled sheets, blanks from one-way-rolled sheets make much more remarkable 45°-earings, when deep-drawn. As the reduction rate increases, the 45°-earings become more remarkable. when the reduction rate is low and annealing temperature is beyond the recrystallization temperature, the 45°-earings are passed into 0°-or 90°-earings.
But, when the reduction rate is high, the 45°-earing does not disappear. The effect of the difference of pre-heating time was so slight that it could not be expressed as a general inclination. The effect of rolling temperature was also not so remarkable. On the other hand, the directionality of these sheets were detected through the Knoop ratio. It wao found out that the ratiom of (maximum Knoop ratio)/(mean knoop ratio) shows the similar inclination to the growth of earings, and thus the directionality of sheet can be found by Knoop ratio. From this experiment, it was proved that Knoop ratio can be used for detecting the directionality of sheet, as previously proposed by the auther.