Patent ID: 7815749

Claim:
A method of manufacturing a semi-hard magnetic material comprising, sequentially: a step of preparing a raw material for the semi-hard magnetic material consisting essentially of 10.0 to 25.0% of Ni, 2.0 to 6.0% of Mo and the balance being Fe and inevitable impurities, in mass %; a step of heat treating or hot working the raw material so that the heat treated or hot worked raw material has not less than 90% of martensitic structure; a step of cold working the heat treated or hot worked material at a reduction of area of not less than 50% so that the thus cold worked material has an extended structure including not less than 95% of martensitic structure; and a step of heat treating the cold worked material in a range of 400 to 570° C. so as to generate more than 0% but less than 30.0% of reverse-transformed austenitic structure.