Surface characteristics and production manner and surface characteristics of the non directivity electromagnetic steel sheet which is superior in iron loss property and the non directivity electromagnetic steel sheet null which is superior in iron loss

摘要

PROBLEM TO BE SOLVED: To provide a non-oriented silicon steel sheet free from surface defects such as pickup and low in core loss without increasing production cost by maximumly utilizing the productivity of a vertical continuous annealing furnace even in a steel contg. V. ;SOLUTION: The method for producing a non-oriented silicon steel sheet excellent in surface properties and core loss characteristics comprises: a steel contg., by weight, 0.005% C, 0.8% Si, 0.1 to 1.0% Mn, 0.001 to 0.05% Al, 0.02% (including zero) S, 0.2% P, 0.005% (including zero) N, either or both of Sb and Sn by 0.002 to 0.02% expressed in terms of Sn+Sn/2 and 0.002 to 0.02% V, furthermore contg. B in the range of B/N (weight ratio)=0.5 to 2.0, and the balance substantial Fe is subjected to hot rolling, is thereafter pickled, is next subjected to cold rolling and is subsequently annealed in a vertical continuous annealing furnace.;COPYRIGHT: (C)1999,JPO