| 摘要 |
<p>A copper-zinc alloy product of the invention contains zinc in an amount of higher than 35% by weight and 43% by weight or less and has a two-phase structure of an ±-phase and a ²-phase. Further, the ratio of the ²-phase in the copper-zinc alloy is controlled to be higher than 10% and less than 40% and the crystal grains of the ±-phase and the ²-phase are crushed into a flat shape and arranged in a layer shape through cold working. According to the copper-zinc alloy product, it is possible to achieve the reduction in material costs by decreasing the copper content and to appropriately secure the strength and cold workability by appropriately controlling the ratio of the ²-phase. Further, in the copper-zinc alloy product, the crystal grains of the ±-phase and the ²-phase which are crushed into a flat shape are arranged in a layer shape, and thus the copper-zinc alloy product has excellent resistance to season cracking and to stress corrosion cracking.</p> |
