HOT ROLLED ELECTROMAGNETIC STEEL SHEET HAVING EXCELLENT MAGNETIC PROPERTIES AND CORROSION RESISTANCE AND METHOD OF PRODUCING THE SAME

摘要

A hot rolled electromagnetic steel sheet having excellent magnetic properties and corrosion resistance is obtained by heating a super-high purity iron comprising Fe: not less than 99.95 mass%, C+N+S: not more than 10 mass ppm, O: not more than 50 mass ppm and the remainder being inevitable impurity to y-zone and subjecting in this .gamma.-zone to hot rolling at a total rolling reduction of not less than 50% and under condition that at least one pass is a friction coefficient between roll and rolling material of not more than 0.3 and thereafter cooling at an average cooling rate of 0.5-150.degree.C over Ar3 transformation point -300.degree.C.