Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
148110, 148112, 148307, H01F 104
The present invention provides a wound core having a low core loss and not susceptible to a disappearance of the core loss lowering effect due to a magnetic domain refining even when stress-relief annealing is conducted after fabrication of a steel strip into a wound core, through a process which comprises, fabricating a very thin silicon steel strip comprising by 6.5% weight or less of silicon with the balance consisting essentially of iron and having a sheet thickness of 100 .mu.m or less and a magnetic flux density (B.sub.8 value) of 1.80T or more into a wound core, subjecting the wound core to stress-relief annealing, unwinding the very thin silicon steel strip from the core, introducing into the very thin silicon steel strip a linear or dotted local strain in a direction at an angle of 45.degree. to 90.degree. to the rolling direction of the thin strip, and rewinding the thin strip onto the core.
patent: 2473156 (1949-06-01), Littmann
patent: 4290829 (1981-09-01), Koshiishi et al.
patent: 4293350 (1981-10-01), Ichiyama et al.
Nippon Steel Corporation
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