| 摘要 |
PROBLEM TO BE SOLVED: To obtain an alloy which has characteristics well balanced among tensile strength, electric conductivity and short-time heat resistance and suitable for an electric cable such as a power-transmission line. SOLUTION: An aluminum alloy, which has a composition containing, as additives, 0.28-0.5% Zr, 0-1-0.3% Fe, 0.1-0.3% Si, 0.09-0.2% Cu, 0.005-0.03% Ti and 0.002-0.005% B and having the balance Al with impurities, is melted. The resultant molten aluminum alloy is cast at >=5 deg.C/s cooling rate. After the temperature of the aluminum alloy reaches 450-550 deg.C, area reduction working is performed at >=80% reduction of area until a temperature of <=200 deg.C is reached while carrying out cooling at >=5 deg.C/s cooling rate. Subsequently, heat treatment is applied at 300-400 deg.C for 8-48 h, and then cold working is performed at >=80% reduction of area.
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