Method for producing semi-processed non-oriented electrical steel sheet with excellent magnetic properties

摘要

C: 0.005 mass% or less, Si: 4 mass% or less, Mn: 0.03 to 2 mass%, P: 0.2 mass% or less, S: 0.004 mass% or less, Al: 2 mass% or less, N: 0.004 mass % And Se: 0.0010 mass% or less, and the steel slab having a composition composed of Fe and unavoidable impurities in the balance is hot-rolled and cold-rolled, and then the average heating rate up to 740 ° C. is set to 100 A semi-processed non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss after strain relief annealing is obtained by performing recrystallization annealing at a temperature not lower than ° C./s.