Is superior in plugging property the alloy null for the FeNi based lead/read frame

摘要

PROBLEM TO BE SOLVED: To provide an Fe-Ni alloy for lead frame, capable of reducing the anisotropy of shearing resistance at the time of blanking and also capable of inhibiting the occurrence of large-sized burr. ;SOLUTION: This alloy is an Fe-Ni alloy for lead frame, containing 30-50 wt.% Ni, and further, the prolonged length L of B type nonmetallic inclusions in a rolling direction is ≤20 μm and also the size of individual nonmetallic inclusion is ≤5 μm. By this method, the anisotropy of shearing resistance can be reduced and residual stress can be uniformized and also the size of burr can be uniformized, and blanking precision can be remarkably improved.;COPYRIGHT: (C)2000,JPO