| 摘要 |
PROBLEM TO BE SOLVED: To suppress a minute damage near a weld zone when producing a electroresistance welded tube of thin/high strength in an aluminum alloy clad material. SOLUTION: A core material has an alloy composition consisting of 0.5-2.0 wt.% Mn, 0.25-0.75 wt.% Cu, 0.3-1.3 wt.% Si, 0.01-0.5 wt.% Mg, the balance Al with an addition of an essential component of Ti, Zr, Cr, V in a range of <=0.02% in order to increase strength, a sacrifice anodizing skin material has an alloy composition consisting of 0.0001-0.15 wt.% In, 0.3-1.7 wt.% Mg, 2.0 wt.% Mn, the balance Al, with an addition of an essential component of 0.01-0.5 wt.% Si and 0.001-0.05 wt.% Ti. Further, a heat treatment condition immediately before final cold rolling after clad rolling is restricted to an annealing temperature of 360-550 deg.C, a temperature rise rate of >=55 deg.C/h between 100 deg.C and the annealing temperature and a cooling rate of >=75 deg.C/h between the annealing temperature and 150 deg.C.
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