Aluminum alloy forged material for automobile and method for manufacturing the same

摘要

It is an object to provide an aluminum alloy forged material for an automobile excellent in tensile strength while maintaining excellent corrosion resistance, and a method for manufacturing the same. Provided are the aluminum alloy forged material for an automobile and a method for manufacturing the same, the aluminum alloy forged material being composed of an aluminum alloy including Si: 0.7-1.5 mass %, Fe: 0.1-0.5 mass %, Mg: 0.6-1.2 mass %, Ti: 0.01-0.1 mass % and Mn: 0.3-1.0 mass %, further including at least one element selected from Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %, restricting Cu: 0.1 mass % or less and Zn: 0.05 mass % or less, and a hydrogen amount: 0.25 ml/100 g-Al or less, the remainder being Al and unavoidable impurities, in which the depth of recrystallization from the surface is 5 mm or less.

主权项

1. An aluminum alloy forged material, comprising:
Si: 0.7-1.5 mass %; Fe: 0.1-0.5 mass %; Mg: 0.6-1.2 mass %; Ti: 0.01-0.1 mass %; Mn: 0.3-1.0 mass %; at least one element selected from the group consisting of Cr: 0.1-0.4 mass % and Zr: 0.01-0.2 mass %; Cu: 0.1 mass % or less; Zn: 0.05 mass % or less; a hydrogen amount: 0.25 ml/100 g-Al or less; and Al, wherein a depth of recrystallization does not exceed 5 mm from the aluminum alloy forged material's surface.