Hitachi Metals, Ltd. and Denso Corporation

Jun Sunakawa

Tsutomu Inui

Masaki Shimizu

Keizo Takeuchi

Shinya Sugiura

A composite magnetic member formed of a single material having a ferromagnetic section with high soft magnetism and a non-magnetic or the like section with sufficiently low magnetic (feebly magnetized or non-magnetic) and sufficient low MS temperature and a process for producing the member are provided. A composite magnetic member made of a single material of martensitic stainless steel including Ni having two sections of a ferromagnetic section having maximum permeability not less than 200 and coercive force not more than 2000 A/m and a feebly magnetized section having permeability not more than 2 and MS temperature not more than -30.degree. C. A process for producing a composite magnetic member, comprising the steps of locally heating a single material of martensitic stainless steel having particular composition including Ni and having ferrite and carbide, at temperature of more than austenite transformation temperature, and rapidly quenching it so that austenite structure is formed in the heated and quenched section which structure has MS temperature not more than -30.degree. C.

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Yasugi, Japan

Jun Sunakawa