NON-ORIENTED SILICON STEEL SHEET EXCELLENT IN FILM PROPERTY AND SURFACE TREATING AGENT FOR THE STEEL SHEET

摘要

PURPOSE: To provide a non-oriented silicon steel sheet excellent in lubricity, corrosion resistance, insulating properties or the like after being subjected to stress relieving annealing as well as excellent in punching properties, weldability or the like, and to provide a treating agent therefor. ;CONSTITUTION: A steel sheet is coated with a treating agent essentially consisting of, as organic substance, one or ≥ two kinds among epoxy, styrene, phenol, melamine, polyester, vinyl acetate, acrylic, silicone series emulsion resin with 0.5 to 3.0μm grain size and one or ≥ two kinds among the chromates of Al, Mg, Ca, Zn or the like, and a coating-baking is executed. In this way, the non-oriented silicon steel sheet in which an insulated film having 0.15 to 0.6μm surface roughness by Ra value (average roughness in the center line) is formed and the shape of spherical projection formed on the surface by coarse- grained emulsion is regulated to ≤3μm diameter and ≤3μm height can be obtd.;COPYRIGHT: (C)1994,JPO&Japio