Abstract
The secular change after cold-working and anneal-hardening of cold-rolled 70/30 brass was measured by hardness and spring tests. A change at room temperature after cold-working was observed, especially in the high reduction specimens, consisting in an increase in hardness and a decrease in bending deflection. As in the previous work on 60/40 brass(1), the change after anneal-hardening of 70/30 brass was influenced by the length of time from final cold-rolling to heat-treatment, and also by the heat-treating time of anneal-hardening. The longer the times, in general, the less the change. Heat-treatment was carried out at 200°C for 15 min∼3 hrs after the specimens had been allowed to remain at 40°C for various durations following the final cold-rolling.
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