Ultra-rapid annealing of nonoriented electrical steel

摘要

Ultra-rapid annealing of nonoriented electrical steel is conducted at a rate above 100 C. per second on prior to or as part of the strip decarburization and/or annealing process to provide an improved texture and, thereby, improved permeability and reduced core loss. During the ultra-rapid heating of cold-rolled strip, the recrystallization texture is enhanced by more preferential nucleation of {100} uvw and {110} uvw oriented crystals and reduced formation of {111} uvw oriented crystals. The preferred practice has a heating rate above 262 C. per second to a peak temperature between 750. degree. C. and 1150 C. and held at temperature for 0 to 5 minutes.