In melting alloy 49KF2 for tape with a low coercive force and small total losses on magnetic reversal one should use iron free of impurities of nickel, copper, oxygen, and sulfur — electrolytic, carbonyl, or DR iron refined in purified hydrogen. Armco iron is unsuitable for manufacturing this alloy.
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O. P. Elyutin et al., in: Precision Alloys, Reports of the Central Scientific—Research Institute of Ferrous Metallurgy, No. 64 [in Russian], Metallurgiya, Moscow (1968).
Central Scientific—Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 58–60, March, 1971.
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Pshechenkova, G.V., Putimtsev, B.N. & Motorin, Y.A. The properties of alloy 49KF2 in relation to the purity of the iron in the charge. Met Sci Heat Treat 13, 235–237 (1971). https://doi.org/10.1007/BF00652800