And a method of manufacturing the copper-based alloy excellent in press-punching properties

摘要

PPROBLEM TO BE SOLVED: To provide a copper alloy for connectors, lead frames, switches, relays, etc., which is excellent in press-blanking property. PSOLUTION: The copper alloy is obtained by: performing homogenizing anneal of an ingot of the copper alloy composed of 0.01-30 wt.% of at least one element chosen from the group consisting of Sn, Ni, P, Zn, Si, Fe, Co, Mg, Ti, Cr, Zr and Al and the balance being Cu and unavoidable impurities; repeating cold rolling and annealing; and performing cold-rolling at a reduction ratio Z% satisfying the relation: Z≥100-10X-Y [wherein Z is the cold-rolling reduction ratio (%); X is the content of Sn (wt.%) among the elements; and Y is the total content of elements other than Sn (wt.%)] and subsequently performing low-temperature anneal at a temperature below the recrystallization temperature. The obtained copper alloy has an X-ray diffracted intensity ratio SSBND/SBat the surface being SSBND/SB≥10, provided that SSBND/SBis represented by the formula: SSBND/SB=Iä220}÷Iä200} [wherein Iä220} is the X-ray diffracted intensity at ä220}; and Iä200} is the X-ray diffracted intensity at ä200}], shows a good balance among conductivity, strength, spring characteristic, hardness, bendability, etc. and is excellent in press-blanking property. PCOPYRIGHT: (C)2009,JPO&INPIT