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    • 2. 发明授权
    • FE-CR soft magnetic material and a method of manufacturing thereof
    • FE-CR软磁材料及其制造方法
    • US06599376B2
    • 2003-07-29
    • US09997386
    • 2001-11-29
    • Hiroshi MorikawaTomoharu ShigetomiRyoji HirotaTakashi Yamauchi
    • Hiroshi MorikawaTomoharu ShigetomiRyoji HirotaTakashi Yamauchi
    • H01F1147
    • C22C38/18C21D6/002C21D8/1272C21D2211/005H01F1/147
    • A Fe-Cr soft magnetic material has electric resistivity not less than 50 &mgr;&OHgr;·cm and a metallurgical structure occupied by a ferrite phase at a surface ratio of 95% or more. A number of fine precipitates of 1 &mgr;m or less in particle size is controlled at a ratio not more than 6×105/mm2. The Fe-Cr alloy has the composition (expressed in mass or weight %) of C up to 0.05%, N up to 0.05%, Si up to 3.0%, Mn up to 1.0%, P up to 0.04%, S up to 1.0%, 5.0-20.0% Cr, Al up to 4.0%, 0-3% Mo, 0-0.5% Ti and the balance being essentially Fe under the conditions of (1) and (2). The Fe-Cr soft magnetic material is useful as a core, a yoke or the like installed in various types of magnetic sensors such as electric power steering, fuel injection systems for vehicles and A.C. magnetic circuits of solenoid valves, due to production of high magnetic induction in a high-frequency low-magnetic field: 4.3×%Cr+19.1×%Si+15.1×%Al+2.5×%Mo≧40.2  (1) 64×%Si+35×%Cr+480×%Ti+25×%Mo+490×%Al≧221×%C+247×%N+40×%Mn+80×%Ni+460  (2).
    • Fe-Cr软磁材料的电阻率不小于50μΩEG·cm,并且以95%以上的表面比例由铁素体相占据的冶金结构。 将1μm以下的粒径的微细析出物的数量控制在6×10 5 / mm 2以下。 Fe-Cr合金的组成(质量或重量%)C为0.05%以下,N:0.05%以下,Si:3.0%以下,Mn:1.0%以下,P:0.04%以下,S: 1.0%,5.0-20.0%Cr,Al至4.0%,0-3%Mo,0-0.5%Ti,余量基本上为Fe,条件为(1)和(2)。 Fe-Cr软磁性材料可用作安装在诸如电动助力转向器,用于车辆的燃料喷射系统和电磁阀的AC磁路的各种类型的磁传感器中的磁芯,磁轭等,由于产生高磁性 感应高频低磁场: