ALUMINUM ALLOY SHEET FOR PRESS FORMING EXCELLENT IN BAKING HARDENABILITY AND ITS PRODUCTION

• Main Authors: KUBOYAMA OSAMU, MITAO SHINJI, MINAGAWA KUNINORI, TSUYAMA AOSHI, FUJITA TAKESHI
• Format: Patent
• Language: English
• Published: 18.09.1992
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To produce an aluminum alloy sheet excellent in press formability and baking hardenability, and suitable for automobile body sheet. CONSTITUTION:The sheet is an aluminum alloy sheet for press forming excellent in baking hardenability and having a composition which consists of, by weight, 3.0-10% Mg, 0.12-0.4% Si, 0.2-0.8% Cu, >=0.5% Zn, 0.005-0.15% Ti, 0.0002-0.05% B, 0.01-0.15% Zr, 0.03-0.3% Fe, and the balance Al with inevitable impurities and in which Si and Cu satisfy the relation in 0.5%<=Cu+2Si<=1.4%. The above alloy sheet can be produced by applying homogenizing treatment to an ingot of aluminum alloy with the above composition at 450-580 deg.C, hot-rolling and cold-rolling this ingot to the desired sheet thickness, and subjecting the resulting sheet to heating up to 440-580 deg.C at >=3 deg.C/sec heating rate, to holding for <=120sec, and then to cooling at >=2 deg.C/sec cooling rate.