Al-Mg-Si-based aluminum alloy cold-rolled plate and its manufacturing method, and molding Al-Mg-Si-based aluminum alloy cold-rolled plate and its manufacturing method

摘要

PROBLEM TO BE SOLVED: To provide an Al-Mg-Si based aluminum alloy plate having high strength, high yield strength and excellent impact resistance, and a method for manufacturing the same. SOLUTION: Si: 0.50 to 0.90% by mass, Fe: less than 0.70% by mass, Cu: 0.10 to 0.90% by mass, Mg: 0.80 to 1.7% by mass, Mn. : 0.10 to 1.3% by mass, Cr: 0.25 to 0.90% by mass, Ti: 0.005 to 0.10% by mass, and an aluminum alloy cold-rolled plate whose balance is Al and unavoidable impurities Therefore, the tensile strength of the test piece with the L direction as the longitudinal direction is defined as UTSL, the charpy value of the test piece with the L direction as the longitudinal direction is defined as SL, and solution treatment is performed at 550 ° C. for 5 minutes. An Al-Mg-Si based aluminum alloy cold-rolled plate having a UTSL of 340 MPa or more and an SL of 16.0 J / cm2 or more, which was measured after further artificial aging treatment at 175 ° C. for 14 hours. [Selection diagram] Fig. 1