| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electromagnetic bar steel having sufficient magnetic properties and high yield strength as a rotor core material, and further having excellent machinability. <P>SOLUTION: The electromagnetic bar steel has a componential composition comprising, by mass, 0.04 to 0.12% C, ≤0.5% Si, 0.5 to 3.0% Mn, ≤0.1% Al, 0.03 to 0.35% Ti and 0.05 to 0.8% Mo, and the balance Fe with inevitable impurities, and has a structure of a ferrite single phase with the average crystal grain size of 30 to 80 μm; wherein the area ratio of the ferrite with a grain size of ≤10 μm is controlled to ≤20%, and also, fine precipitates with a grain size of <10 nm are dispersed into the ferrite. <P>COPYRIGHT: (C)2008,JPO&INPIT |
