| 摘要 |
PURPOSE:To greatly reduce the costs by selecting materials constituting a lead frame from Cr, Ni, Si, and Ti with amounts of inclusion being specified; and by adding P and Cu, whose acounts of inclusion are specified, and Fe for the remaining part. CONSTITUTION:One or more materials are selected from the group of elements comprising 0.30-1.50wt% of Cr, 0.20-1.0wt% of Ni, 0.15-0.75wt% of Si, and 0.08-0.15wt% of Ti so that the total amount becomes 0.08-3.40%. Furthermore, 0.05-0.60wt% of P, 0.04-0.70wt% of Cu, and Fe for remaining part are added to the materials mentioned above. Then, a plate is formed by using the materials with said composition, and press machining is performed to form a comb-tooth shape. Then, Ag- or Au-plated layer is formed on the surface. In this way, the amounts of expensive Ni and Cr are decreased, and the errosion resistance can be obtained better than that of the conventional Fe-Ni alloy. |
