| 摘要 |
PROBLEM TO BE SOLVED: To improve stress corrosion cracking resistance and also to improve earing rate at the time of rolling by precipitatingβ-phases at the multiplied dislocation and preventing the precipitation at the grain boundaries by applying warm rolling to an Al-Mg alloy sheet of specific composition. SOLUTION: This alloy has a composition consisting of, by weight ratio, 0.5-8% Mg, at least one kind among 0.1-0.5% Mn, 0.05-0.2% Cr, and 0.05-0.2% Zn, and the balance Al with inevitable impurities. It is preferable that either of 0.02-1.0% Cu and 0.1-2.0% Zn and/or 0.001-0.05% Ti is further incorporated into the above composition. After ordinary hot rolling is applied to this alloy, warm rolling is applied while regulating rolling and rolling finishing temps. to 80-200 deg.C. If necessary, cold rolling can be applied before warm rolling, and, at this time, warm rolling can be done without external heating by setting the draft of warm rolling at a slightly high value and utilizing the heat generated as a result of reduction.
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