High-strength thin plate of iron-nickel-cobalt alloy excellent i

Details High-strength thin plate of iron-nickel-cobalt alloy excellent i High-strength thin plate of iron-nickel-cobalt alloy excellent i

1995-03-20

1998-08-11

Ip, Sikyin

Metal treatment

Stock

Ferrous

148442, 148505, 148650, 148651, 148707, 420 95, 420581, C22C 3800, C22C 3810

Patent

active

057922861

ABSTRACT:
A high-strength thin plate, such as for IC lead frames, of an iron-nickel-cobalt alloy which is able to withstand repeated bending and is corrosion resistance and etchable, the alloy containing 27 to 30 wt. % N:, 5 to 18 wt. % Co, 0.10 to 3.0 wt. % Mn, 0.10 wt. % or less Si, 0.010 to 0.075 wt. % C, 0.001 to 0.014 wt. % N, less than 2.0 ppm H, 0.0040 wt. % or less S, 0.004 wt. % or less P, 0.0050 wt. % or less O, 0.01 to 0.06 wt. % Cr, 0.01 to 1.0 wt. % Mo and the balance being Fe and unavoidable impurities wherein 63.5 wt. %.ltoreq.2Ni+Co+Mn.ltoreq.65 wt. % for Co<10 wt. % and 69.5 wt. %.ltoreq.2Ni+Co+Mn.ltoreq.74.5 wt. % for Co>10 wt. %.

REFERENCES:
patent: 4028144 (1977-06-01), Tomishima et al.
patent: 5147470 (1992-09-01), Nakamura et al.
JIS Z-2371 -1988 established by MITI "Method of Neutral Salt Spray Testing"; revised Jun. 1, 1988; Japanese language text and corresponding English language text, both published by Japanese Standards Association.

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