METHOD FOR DECREASING IRON LOSS OF GRAIN ORIENTED SILICON STEEL SHEET

摘要

PURPOSE:To considerably decrease an iron loss with good safety by radiating a plasma flame to a grain oriented silicon steel sheet having a prescribed average grain size and magnetic flux density. CONSTITUTION:The plasma flame is radiated to the grain oriented silicon steel sheet having >=3mm average secondary recrystallization grain size and >=1.85T magnetic flux density at 1,000A/m magnetization force. The plasma flame in this stage is preferably radiated linearly in the direction approximately perpendicular to the rolling direction. The angle may be inclined by about 45 deg. and the radiation may not be linear but be spot-like or curvilinear. Since the iron loss of the steel sheet is extremely low according to the above-mentioned method, the energy loss of an electrical apparatus such as transformer for the iron core of which the grain oriented silicon steel sheet is used is considerably decreased.