| 摘要 |
This copper alloy is used for electrical contact materials or electrode materials for resistance welding and spot welding. This alloy comprises 0.20 to 1.45wt.% Cr, 0.02 to 2.00wt.% 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 of cast structure, (c) solution treatment of the hot worked material by quenching such as water cooling or oil cooling after holding of over 30min per the thickness of 1 inch at 800 to 1050deg.C, (d) cold working by rolling, forming, drawing in reduction ratio of over 70% at the room temperature, and (e) aging hardening heat-treatment by water cooling, oil cooling, air cooling after holding for over 1 hr at 350 to 550deg.C..
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