ALUMINUM ALLOY SHEET FOR MOLDING PROCESS

摘要

PROBLEM TO BE SOLVED: To provide an Al-Mg-based alloy sheet for molding process under more precise and simple structural indexes, which hardly generates SS marks and is superior in press moldability without causing a new problem such as deterioration in bendability due to age hardening at room temperature.SOLUTION: As structural indexes of an Al-Mg-based aluminum alloy sheet with specific composition containing Cu, an average grain diameter and a volume ratio are controlled in a specific range in grain size distribution of fine grains (clusters) measured by an X-ray small angle scattering method to make a sheet structure hardly generate serration and thereby suppress the generation of SS marks during a press molding process.