| 摘要 |
PURPOSE:To manufacture the titled copper-base alloy excellent in spring characteristic, strength, electric conductivity, and workability, by subjecting a copper- base alloy having a specific composition successively to hot rolling, cold rolling, annealing, cold rolling, and tension annealing under specific conditions. CONSTITUTION:A slab of the copper-base alloy consisting of, by weight, 1.0-3.0% Sn, 0.05-0.40% Ni, 0.16-0.40% Fe, 0.05-0.10% P, and the balance Cu with inevitable impurities is prepared. This slab is hot-rolled at >=700 deg.C finishing temp. of hot rolling at >=60% draft and cooled through the temp. range from the finishing temp. of hot rolling to <=300 deg.C at >=30 deg.C/min cooling rate. Subsequently, after subjected, if necessary, to pickling treatment, etc., this hot-rolled plate is subjected to the first cold rolling at >=about 50% draft, to annealing at 400-600 deg.C for 5-720min, and to cold rolling until the desired thickness is reached. Then this cold-rolled stock is subjected to tension annealing treatment at 300-750 deg.C for 5-180sec.
|
