SOFT MAGNETIC STEEL WITH EXCELLENT COLD FORGEABILITY, MACHINABILITY AND AC MAGNETIC PROPERTY, SOFT MAGNETIC STEEL PARTS WITH EXCELLENT AC MAGNETIC PROPERTY AND METHOD FOR MANUFACTURING THE PARTS

摘要

PROBLEM TO BE SOLVED: To provide soft magnetic steel by which soft magnetic steel parts of complicated shape can be manufactured in high yield at a low cost while securing excellent ac magnetic properties and exhibiting superior cold forgeability and machinability in the course of manufacturing process.;SOLUTION: The soft magnetic steel with excellent cold forgeability, machinability and ac magnetic properties has a composition consisting of 0.004 to 0.020% (by mass, the same applies to the following) C, 2.0 to 4.0% Si, 0.2 to 1.0% Mn, ≤0.02% (not including 0%) P, 0.02 to 0.10% S, 0.05 to 2.0% Al, 0.01 to 0.1% Cu, 0.01 to 0.1% Ni, 0.01 to 0.1% Cr, ≤0.0050% (not including 0%) N, ≤0.010% (not including 0%) O and the balance Fe with inevitable impurities and satisfying [Mn]/[S]≥8 {where [Mn] and [S] represent Mn content (mass%) and S content (mass%), respectively} and also has a metallic structure composed of a ferrite single phase structure.;COPYRIGHT: (C)2007,JPO&INPIT