Method for manufacturing non-oriented electrical steel sheet showing superior adherence of insulating coated layer

A method for manufacturing a non-oriented electrical steel sheet having a superior adherence of an insulating coated layer, comprising the steps of:

• making a steel slab composed of in weight %:
• 0.05% or less of C, 3.5% or less of Si, 1.5% or less of Mn, 0.15% or less of P, 0.015% or less of S, 1.0% or less of Al, one or more elements selected from the group consisting of 0.03-0.30% of Sn, 0.03-0.3% of Sb, 0.03-1.0% of Ni and 0.03-0.50% of Cu, the balance Fe and unavoidable impurities;
• reheating said steel slab, and carrying out a hot rolling to produce a hot rolled steel sheet;
• pickling said hot rolled steel sheet after annealing or without annealing said hot rolled steel sheet;
• cold-rolling said pickled hot rolled steel sheet to produce a cold rolled steel sheet;
• carrying out a low temperature annealing on said cold rolled steel sheet at a temperature of 750.degree.-850.degree. C. for 30 seconds to 5 minutes under a humid atmosphere having a dew point of 25.degree.-65.degree. C.;
• carrying out a high temperature annealing on said low-temperature-annealed cold rolled steel sheet at a temperature of 800.degree.-1070.degree. C. for 10 seconds to 3 minutes under a dry atmosphere having a dew point of 0.degree. C. or below so as to produce a high temperature annealed steel sheet;
• and
• coating insulating layers on the surfaces of said high-temperature-annealed steel sheet, and carrying out a hardening heat treatment on said coated steel sheet.