ALUMINUM ALLOY TUBE SHAPED HOLLOW SHAPE MATERIAL AND TUBING MATERIAL FOR HEAT EXCHANGER

摘要

To provide an aluminum alloy tube shaped hollow shape material of 5000 series aluminum alloy manufactured by porthole extrusion, excellent in flexure workability.SOLUTION: There is provided an aluminum alloy tube shaped hollow shape material manufactured by porthole extrusion, consisting of an Al-Mg-based alloy containing Mg:0.7 mass% or more and less than 2.5 mass%, Ti:over 0 mass% and 0.15 mass% or less, and the balance Al with inevitable impurities, having process curing index n value of 0.25 or more and less than 0.43, having an inner surface convex structure inside of the aluminum alloy tube shaped hollow shape material, and having area ratio of the inner surface convex structure in a cross section vertical to an elongation direction of the aluminum alloy tube shaped hollow shape material of 1 to 30%.SELECTED DRAWING: Figure 1