| 摘要 |
PURPOSE:To improve the machinability without deteriorating the hot workability or electric conductivity by specifying the amounts of S, Se, Te, P, B, Zr and REM. CONSTITUTION:This free-cutting oxygen-free copper consists of 0.02-1wt% in total of one or more among 0.01-0.5wt% each of S, Se and Te and the balance Cu or further contains 0.001-0.1wt% in total of one or more among P, B, Zr and REM. The copper has remarkably improved machinability without deteriorating the superior hot workability or electric conductivity.
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