Magnetically soft ferritic Fe-Cr-Ni alloys

A telephone receiver comprising a component whose position with respect to the receiver is dependent on strength or direction of a magnetic field, the component comprising a magnetically soft alloy body, the alloy having a coercive force H.sub.c of no more than about 2.0 Oe and a maximum permeability .mu..sub.m of at least about 2500 G/Oe, both measured at room temperature, and a yield strength to 0.2% offset of at least about 35.10.sup.7 Pa,

• characterized in that
• (a) the alloy comprises at least about 82 weight percent Fe, between about 3 and about 10 weight percent Cr, between about 2 and about 8 weight percent Ni, these three elements being present in the alloy in a combined amount of at least 99 weight percent, with no element other than Fe, Cr, and Ni being present in an amount greater than 0.5 weight percent, and no element of the group consisting of C, N, O, S, B and P being present in an amount greater than 0.1 weight percent, and
• (b) the alloy body has a multiphase structure comprising .alpha.-phase material, with the amount of non-.alpha.-phase material present in the alloy body being at least about 5 volume percent.

Magnetically soft alloy having a coercive force H.sub.c of no more than about 3.0 Oe and a maximum permeability .mu..sub.m of at least about 1500 G/Oe, both measured at room temperature,

• characterized in that
• (a) the alloy comprises at least about 82 weight percent Fe, between about 3 and about 10 weight percent Cr, between about 2 and about 8 weight percent Ni, and
• (b) the alloy has a multiphase structure comprising .alpha.-phase material, with the amount of non-.alpha.-phase material in the alloy being at least about 5 volume percent.