ALUMINUM ALLOY TUBE

摘要

PROBLEM TO BE SOLVED: To exhibit stable brazing properties by covering a brazing material powder with a binder. SOLUTION: The aluminum alloy tube obtained at its outer surface by covering a brazing alloy powder with a binder comprises a protrusion and recess rough surface having a depth of 10μm or more at a tube body material surface so that a difference between an uppermost protrusion of the body material surface and an uppermost protrusion of a brazing material layer covering the body material surface is 3 to 25μm. In this case, the brazing material powder is an aluminum alloy containing an Si of 15 to 50 wt.%.