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Abstract

Soft magnetic alloy of the iron-nickel type, the chemical composition of which comprises, by weight: 40%.ltoreq.Ni+Co.ltoreq.65%; 0%.ltoreq.Co.ltoreq.7%; 2%.ltoreq.Cr.ltoreq.5%; 1%.ltoreq.Ti.ltoreq.3%; 0%.ltoreq.Al.ltoreq.0.5%; 0%.ltoreq.Mn+Si.ltoreq.2%; optionally, up to 3% Mo, 2% W, 2% V, 1.5% Nb, 1% Ta and 3% Cu, the sum of the Cr, Mo, W, V, Nb, Ta and Cu contents being less than 7% and the sum of the Mo, W, V, Nb, Ta and Cu contents being less than 4%; the balance being iron and impurities, such as carbon, sulfur and phosphorus, resulting from the smelting process, the chemical composition furthermore satisfying the relationships: Cr<5-0.015.times.(Ni+Co-52.5).sup.2, if: Ni+Co.ltoreq.52.5; Cr<5-0.040.times.(Ni+Co-52.5).sup.2, if: Ni+Co.gtoreq.52.5; the alloy having a saturation induction Bs of greater than 0.9 tesla, a coercive field of less than 10 A/m, an electrical resistivity p of greater than 60 .mu..OMEGA..cm and a hardness of greater than 200 HV. Process for manufacturing the alloy and uses.

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