MANUFACTURE FOR NON-ORIENTED ELECTROMAGNETIC STEEL PLATE WITH HIGH MAGNETIC FLUX DENSITY, SMALL CORE LOSS AND LESS ANISOTROPY

摘要

PROBLEM TO BE SOLVED: To provide a method for a non-oriented electromagnetic steel plate with high magnetic flux density, small core loss and less anisotropy. ;SOLUTION: According to the manufacture for a non-oriented electromagnetic steel plate, a slab consisting of components of an αγ transformation containing at least one or more of 0.10%≤Si≤2.50%, 0.10%≤Al1.00% and 0.10%≤Mn≤1.50% and satisfying Si+2A≤2.50%, and the remaining wt.% of Fe and irreversible impurities is hot rolled thereby obtaining a hot rolled plate. The hot rolled plate is subjected to cold rolling once and then finish annealing. At this time, low friction rolling of not larger than 0.22 coefficient of friction for at least one path of a γ phase region of finish hot rolling is carried out with not smaller than 30% draft. A kinematic viscosity of a lubricating oil mixed in a rolling cooling water at the low friction rolling is 100-800 cSt, and a temperature when the finish hot rolling terminates is 800-((3xAr₁+2 xAr₃)/5)°C. The plate is wound thereafter in a temperature range of 600-850°C.;COPYRIGHT: (C)1998,JPO