Abstract: The invention concerns an alloy whereof the chemical composition comprises, by weight: 35%=Ni=37%. 0.001% %=C=0.05, % Mn=0.10%, Si=0.15%, Co=0.5%, S<0.002%, P=0.006%, B=0.0005%, Al+Mo+Cu+Cr=0.15% 0.015%=2(V+Ti)+Nb+Zr+Ta+III=0.2%, 0.0025%=N+O=0.015% optionally calcium and/or magnesium with total content ranging beween 0.001 and 0.005%, the rest consisting of iron and unavoidable impurities resulting from preparation, and a method for making a strip of said alloy.

Abstract: The invention relates to a magnetic screening for frequency fields between 50 Hz and 3000 Hz, made from a soft magnetic alloy of the following composition in wt. %: 30%?Ni?40%, 0%?Cu+Co?4%, 5%?Cr+Mo?17%, 5%?Cr 0%?Nb?2%, Mn?0.35%, Si?0.2%, C?0.050%, O?0.0160%, S?0.0020%, B?0.0010%, optionally at least one element selected from magnesium and calcium in amounts such that the sum thereof remains below 0.1 %, the rest being iron and production impurities. The chemical composition furthermore satisfies the following relationships: Cr+Mo?0.8×Ni+0.9×(Co+Cu) 18.4; Cr+Mo?4×Ni+3×(Co+Cu)?124; 4×(Cr+Mo)?125?3×Ni. The invention further relates to use of said alloy for the production of low-frequency magnetic screening.