Method for producing a grain-oriented electrical steel sheet having a low watt-loss

摘要

PCT No. PCT/JP85/00627 Sec. 371 Date Sep. 5, 1986 Sec. 102(e) Date Sep. 5, 1986 PCT Filed Nov. 11, 1985 PCT Pub. No. WO86/02950 PCT Pub. Date May 22, 1986.Grooves are formed on a finish-annealed electrical steel sheet by applying a mean load of from 90 to 220 kg/mm2 to the steel sheet, which is then heat treated at a temperature of 750 DEG C. or higher, and thereby fine crystal grains are generated at the strain-introduced sites of the steel sheet. The fine crystal grain reduces the watt-loss value. Such a watt-loss improving effect is not impaired even by stress-relief annealing.