CORRECT ELECTROMETIC STAFF WITH PRESENTING MAGNETICAL CHARACTERISTICS, NOT BASIC FILM PRESENTED AS PRIMARY POINTS AND MANUFACTURING PROCEDURES FOR THEM.

摘要

A grain oriented electromagnetic steel sheet is free from an undercoating mainly composed of forsterite (Mg2SiO4), excellent in processability and magnetic properties and useful to production cost, and has a composition containing, by % by mass, 2.0 to 8.0% of Si, wherein secondary recrystallized grains contains fine crystal grains having a grain diameter of 0.15 mm to 0.50 mm at a rate of 2 grains/cm2 or more. In the process of producing the steel sheet, inhibitors are not utilized, and the fine crystal grains are achieved by high purification and low temperature final annealing. IMAGE