Imphy Ugine Precision

Imphy S.a.

Pierre Louis Reydet

Jean-Pierre Reyal

Ricardo Cozar

Lucien Coutu

Process for manufacturing a strip made of an Fe&mdash;Ni alloy of the &ldquo;&ggr;&prime; and/or &ggr;&Prime; structural hardening&rdquo; type, the thermal expansion coefficient between 20&deg; C. and 150&deg; C. of which is less than 7&times;10 /K, in which a hot strip is manufactured either by hot rolling a semi-finished product or by direct casting of a thin strip which is optionally lightly hot-rolled, and the hot strip is subjected to a softening annealing operation consisting of a soak between 950&deg; C. and 1200&deg; C. followed by rapid cooling and optionally a pickling operation, in order to obtain a softened strip; a cold-worked strip is manufactured by cold rolling the said softened strip, with a reduction ratio of greater than 5%; and the cold-worked strip is subjected to a recrystallization annealing operation in an inert or reducing atmosphere, carried out either on the run with a residence time between 900&deg; C. and 1200&deg; C. of between 30 s and 5 min, or statically with a soak at a temperature of between 900&deg; C. and 1050&deg; C. for a time of between 15 min to 5 h, followed by cooling down to a temperature below 500&deg; C. at a cooling rate sufficient to prevent the formation of hardening precipitates. Strip made of an Fe&mdash;Ni alloy.

Process for manufacturing a strip made of an Fe-Ni alloy

An iron-nickel alloy, the chemical composition of which includes by weight:

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Gimouille, France

Pierre Louis Reydet