| 摘要 |
PROBLEM TO BE SOLVED: To provide a brass material, when applied to a brass product used in a stress corrosion cracking environment, particularly, as a flare nut, which can obtain satisfactory stress cracking resistance, and is also advantageous in production cost, and to provide its production method. SOLUTION: The brass has a composition comprising 57 to 61% Cu and 1 to 3.7% Pb, and in which the content of Sn is controlled to≤0.35%, and the balance Zn with impurities, and is composed of anα+βtwo phase at ordinary temperature. The average crystal grain size of theαphase is≤15μm, the average crystal grain size of theβphase is≤10μm, and the phase ratio of theαphase exceeds 80%. COPYRIGHT: (C)2006,JPO&NCIPI
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