Non-oriented silicon steel sheet and method

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

1996-09-05

1997-10-14

Ip, Sikyin

Metal treatment

Stock

Magnetic

148112, 148121, C22C 3806

Patent

active

056767714

ABSTRACT:
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 .mu.m 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 .mu.m 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 .mu.m 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.degree. C./s.sup.2 or less in the cooling process of such steel sheet in a finish annealing.

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