Fe-Cr-Al系電磁ステンレス鋼の特性について

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New soft magnetic stainless steels with high electrical resistivity and low deformation resistance have been developed.Three dimensional dynamic magnetic analysis was applied to analyze the response of an electronic fuel injectior. It shows that increase of electrical resistivity of the materials used in the magnetic circuit can improve the response of the injectior.The addition of Al to Fe-Cr alloys was found to be most favorable to the increase of electrical resistivity and low deformation resistance.It was also found that the Fe-Cr steels with Al addition showed high corrosion resistance which might be due to the thin film of Al2O3 formation on the surface.The chemical compositions of newly developed soft magnetic stainless steels series are as follows:(1) Fe-13wt%Cr-0.03∼2.5wt%Al-Pb for high electrical resistivity, good cold forgeability and good free machinability.(2) Fe-18wt%Cr-1wt%Al-(Pb) for high resistivity and excellent corrosion resistance.
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