| 摘要 |
PURPOSE:To obtain an Al alloy for bicycle having fine grain size, excellent in stress corrosion cracking resistance in a weld zone, and having high fatigue strength, by specifying a composition consisting of Zn, Mg, Ti, B, Cu, Mn, Ag, Ni, Si, Cr, Zr, and Al. CONSTITUTION:The Al alloy for bicycle has a composition consisting of, by weight, 3.0-8.0% Zn, 0.3-3.0% Mg, 0.005-0.20% Ti, 0.005-0.05% B, 0.03-0.5% Cu, 0.05-0.40% Mn, one kind among 0.03-0.5% Ag, 0.03-0.5% Ni, and 0.2-0.7% Si, further both of 0.05-0.40% Cr, and 0.05-0.25% Zr, and the balance Al with inevitable impurities, in which grain size in a cast structure is regulated to <=1,500mum. This alloy has fine grain size and also has superior stress corrosion cracking resistance in a weld zone and high fatigue strength of welding material and, moreover, it is excellent in vibration strength.
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