Non-oriented electrical steel sheets and the method of producing these steel sheets.

Abstract

The invention relates to an unoriented electrical steel sheet comprising a base metal whose chemical composition contains, in percentage by mass, C: from 0.0050% or less, Si: greater than 3.50% and from 4.50% or less, Mn: less than 0.60%, Al: from 0.25% to 0.65%, P: from 0.030% or less, S: from 0.0020% or less, N: from 0.0040% or less, Ti: less than 0.0040%, Nb: less than 0.0040%, Zr: less than 0.0040%, V: less than 0.0040%, Cu: less than 0.200%, Ni: less than 0.500%, and Sn and / or Sb: in total amount from 0.030% or less, with the remainder being Fe and impurities; and satisfy [4.3≤Si+Al+0.5×Mn≤5.0], where the average crystal grain size of the base metal is greater than 40 μm and 140 μm or less, the integration of the {111} orientation is 3.0 or more, the integration of the {110} orientation is 0.15 or less; and the plate thickness is from 0.10 to 0.30 mm.