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 cold-rolled plate and a method for producing the same, which have high strength and excellent impact resistance after solutionization and aging treatment and suppress anisotropy related to impact resistance. SOLUTION: The tensile strength of a test piece of an aluminum alloy cold-rolled plate for molding having a predetermined composition and having the L direction as the longitudinal direction is defined as UTSL, and the tensile strength of the test piece having the LT direction as the longitudinal direction. When the strength is defined as UTSLT, the charpy value of the test piece whose longitudinal direction is the L direction is defined as SL, and the charpy value of the test piece whose longitudinal direction is the LT direction is defined as SLT, a predetermined solution-forming artificial aging is performed. The metal structure measured after the treatment is a recrystallized structure having an average crystal grain size of less than 20 μm, UTSL is 350 MPa or more, UTSLT is 350 MPa or more, SL is 16.0 J / cm2 or more, and SL. An Al-Mg-Si based aluminum alloy cold-rolled plate characterized by a / SLT ratio of less than 1.4. [Selection diagram] Fig. 1