Patent ID: 7211160
Filing Date: 2007-05-01
Classification: C22C,C22F

Abstract:
1. An aluminum alloy piping material for automotive tubes having excellent corrosion resistance and formability and which is an annealed material of an aluminum alloy comprising, in mass percent, 0.8 to 1.5% of Mn, 0.05% or less of Cu, 0.10 to 0.20% of Ti, 0.30% to 0.60% of Fe, and 0.50% or less of Si with the balance being aluminum and unavoidable impurities, wherein the aluminum alloy piping material has an average crystal grain size of 100 μm or less, and Ti-based compounds having a grain size of 10 μm or more do not exist as an aggregate of two or more serial compounds in a single crystal grain, wherein the aluminum alloy is hot-extruded and cold-drawn at a reduction ratio of 30% or more, the total reduction ratio of hot extrusion and cold drawing is 99% or more and the temperature increase rate during annealing is 200° C./h or more.