| 摘要 |
This copper alloy is used for the electrical contact materials or electrode material for resistance welding and spot welding. This alloy comprises 0.20 to 3.00wt.% Zr, 0.02 to 0.50wt.% Mg, and the balance of copper. This alloy is produced by the processes of (a) manufacturing a billet or slab by melting and casting the same composition as above as starting materials, (b) hot working the billet or slab by forging, rolling and extrusion in the reduction ratio of over 85% at 800 to 950deg.C for removing cast structure, (c) solution treating the hot worked material by quenching such as water cooling or oil cooling after holding for over 30min per the thickness of 1 inch at 800 to 1050deg.C, (d) cold working by rolling, forming, drawing in the reduction ratio of over 70% at room temperature, and (e) aging hardening heat-treating by water cooling, oil cooling, air cooling after holding for over 1 hr at 350 to 550deg.C..
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