ALUMINUM ALLOY SHEET FOR HOT ROLL MOLDING AND MANUFACTURING METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for hot roll molding high in high temperature ductility in a high strain rate range and excellent in productivity by high speed molding and a manufacturing method therefor.SOLUTION: There is provided an aluminum alloy sheet for hot roll molding consisting of an aluminum alloy containing Mg:0.3 to 2.0 mass% and Si:0.6 to 2.0 mass%, further one or two kind of Mn:0.04% to 0.50 mass% and Cr:0.04% to 0.30 mass%, and the balance Al with inevitable impurities and having existence probability that grain boundary of neighboring crystal grains is small angle grain boundary of less than 15° after temperature increase to 530°C with a temperature rising rate of 60°C/minutes of 50% or more.SELECTED DRAWING: Figure 1