Non-oriented silicon steel sheet and method

Details Non-oriented silicon steel sheet and method Non-oriented silicon steel sheet and method

H - Electricity

01

F

H01F 1/16 (2006.01) C21D 8/12 (2006.01) C22C 38/02 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2133168

A non-oriented silicon steel sheet having a low core loss contains Si in an amount of about 2.5 - 5.0 wt% and S restricted to about 0.003 wt% or less and inclusions; the volume ratio of those inclusions having a particle size of about 4 µm or higher to the total volume of inclusions is about 5 - 60 %, and the volume ratio of inclusions having a particle size less than about 1 µm to the total volume of inclusions is about 1 - 15 %; when the sheet contains Mn in an amount of about 0.4 - 1.5%, and the volume ratio of particles less than 1 µm is about 1 - 5 %, the silicon steel sheet also has a low rotation core loss. The method of manufacturing comprises controlling the change of a cooling speed to about 5°C/s2 or less in the cooling process of such steel sheet in a finish annealing.

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