Method for producing a Fe-Ni alloy sheet and a Fe-Ni alloy shado

Details Method for producing a Fe-Ni alloy sheet and a Fe-Ni alloy shado Method for producing a Fe-Ni alloy sheet and a Fe-Ni alloy shado

1997-03-07

2000-08-08

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148651, 148653, C22F 110, B21J 102

Patent

active

060996692

ABSTRACT:
Composition segregation which results in streaks in an Fe--Ni alloy sheet shadow-mask is prevented by the following conditions. Heat-treatment from 1150.degree. C. to a temperature lower than the melting point for longer than 1 hour and not longer than 30 hours. Subsequent rough-rolling or forging at a reduction of area of 40% or more. A slab is subjected to removal of oxide scale on its surface and then heated in hydrogen atmosphere having dew point of 10.degree. C. or lower at a temperature of not less than 1100.degree. C. and lower than the melting point for time (t - hour) which is defined by:

REFERENCES:
patent: 3657026 (1972-04-01), Colling

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