ULTRA-RAPID ANNEALING OF NONORIENTED ELECTRICAL STEEL

摘要

Ultra-rapid annealing of nonoriented electrical steel is conducted at arate above 100°C per second on prior to or as part of the strip decarburizationand/or annealing process to provide an improved texture and, thereby,improved permeability and reduced core loss. During the ultra-rapid heatingof cold-rolled strip, the recrystallization texture is enhanced by morepreferential nucleation of {100}uvw and {110}uvw oriented crystals andreduced formation of {111}uvw oriented crystals. The preferred practicehas a heating rate above 262°C per second to a peak temperature between750°C and 1150°C and held at temperature for 0 to 5 minutes.