PRODUCTION OF ALUMINUM-MAGNESIUM ALLOY EXCELLENT IN SCC RESISTANCE AND EARING RATE

摘要

PROBLEM TO BE SOLVED: To improve stress corrosion cracking resistance and also to improve earing rate at the time of rolling by precipitating β-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°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.;COPYRIGHT: (C)1997,JPO