Title:
MANUFACTURE OF MATERIAL FOR LEAD FRAME
Document Type and Number:
Japanese Patent JPS59100215
Kind Code:
A
Abstract:
PURPOSE: To obtain a strain-relieved material for a lead frame with superior suitability to blanking by adding a specified amount of S to a conventional Fe- Ni alloy controlling its thermal expansion, restrcting the Mg content of the alloy to a specified amount or less, cold rolling the resulting material, and annealing it at a specified temp.
CONSTITUTION: The composition of an Fe-Ni alloy controlling its expansion is composed of, by weight, 30W40% Ni, 0.005W0.02% S, <0.005% Mg, <1% Mn and the balance Fe with inevitable impurities. The material contg. said specified amount of S and said restricted amount of Mg is cold rolled and annealed at 500W720°C.
Inventors:
ABEYAMA SHIYOUZOU
YAMADA NORIHIKO
YAHAGI SHINICHIROU
KUSUO ISAO
YAMADA NORIHIKO
YAHAGI SHINICHIROU
KUSUO ISAO
Application Number:
JP20942182A
Publication Date:
June 09, 1984
Filing Date:
December 01, 1982
Export Citation:
Assignee:
DAIDO STEEL CO LTD
International Classes:
C22C38/00; B21B3/02; C21D6/00; C21D8/00; C21D9/46; (IPC1-7): B21B3/02; C21D6/00; C22C38/08
Domestic Patent References:
| JPS563652A | 1981-01-14 | |||
| JPS57155357A | 1982-09-25 | |||
| JPS57155353A | 1982-09-25 |
Attorney, Agent or Firm:
Tsukimura Shigeru
Previous Patent: JPS59100214
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