| The relationships between the degree of pre-work and the annealing condition for the deep drawing of 70/30-and 90/10-brass were studied. In the grain size control, it was found that the 90/10 brass showed relatively large deviation according to the different degree of pre-work, while the 70/30-brass was nearly uneffected. To get the optimum grain size for the deep drawing of Alpha-brass, 0.035㎜-0.05㎜ in average grain diameter, the 70/30-brass was sufficient to anneal 30 min. at 600℃ without considering the degree of pre-work 33% to 55%. But, for the 90/10-brass, it was resulted that the sample pre-worked about 60% needed 60 min. annealing at 600℃, and pre-worked under 50% was required the different annealing condition which was higher in temp. and longer in time than that of the 60℃ worked sample. And especially in 70/30-brass, the annealing condition mentioned above could be applied to the work-anneal cycle. |
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