| 摘要 |
PURPOSE: A method for manufacturing high strength copper alloy for use in electric/electronic components such as connector/terminal is provided to solve problems arising from high Sn content in phosphor bronze. The present invention set the Sn content in phosphor bronze lower so that electric conductivity is increased above 15% IACS. Also, both Ni and Si are added in the copper alloy to compensate strength decline level. CONSTITUTION: The manufacturing method of the high strength copper alloy comprises the processes of preparing an ingot comprising Sn 3.0-6.0wt.%, Ni 0.5-2.0wt.%. Si 0.1-1.0wt.%, Fe 0.5-2.0wt.%, Nd 0.05-0.5wt.%, P 0.01-0.15wt.%, 0.001-2.0wt.% of at least one element selected from Zn, B, Al, Ca, Co, Ti, Zr, Mg, Pd, Mn, REM, a balance of Cu, and other inevitable impurities; quenching the ingot after hot rolling in the temperature range of 700 to 950deg.C; cold rolling in a reduction ratio of 50 to 80% and then heat treating in the temperature range of 300 to 800deg.C for 15-240min wherein above cold rolling and heat treating are performed twice or three times repeatedly; final cold rolling in a reduction ratio of 30 to 60%; and then annealing in the temperature range of 200 to 500deg.C for 0.5-60min.
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