高硬度電磁ステンレス鋼K-M57の開発
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概要
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Voices of our customers in late 1990s requiring soft-magnetic steels with high hardness for high wear resistance and high durability drove us to launch research and development and we have succeeded in developing a new steel K-M57, Fe-15Cr based precipitation-hardened ferritic steel by modifying a base steel with high hardness above 400HV but not quite satisfactory concerning magnetic properties and manufacturability. A simple relationship between concentrations of alloy elements and matrix phase has been found around the composition of base steel which gave us a confirmation about stability of ferritic matrix and helped us to design the new steel. Newly developed K-M57 has both high hardness (>350HV) and high performance soft-magnetic properties (Hc<100A/m, μmax>2500μH/m, B2000>1.2Tesla) simultaneously, which satisfy the requirements of magnetic cores of various types of solenoid valves including fuel injectors of automobiles. It also has high corrosion resistance and high electric resistivity (ρ≅90μΩ-cm) suitable for highly responsive devices. K-M57 has also good manufacturability due to low hardness (<250HV) after solution treatment which enables cold-drawing. Machinability is not less than SUS304 containing 0.02mass%Sulfur. It is expected that the demands for the new steel will further extend because of its potential for expanding freedom of solenoids design and eliminating surface hardening treatment of parts as well as of eco-friendliness from them.
- 電気製鋼研究会の論文
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