INDUSTRIAL TRIALS OF EFFECT OF ADDITION OF GRAIN BOUNDARY SEGREGATING ELEMENTS (SN, SB) ON IMPROVEMENT OF MAGNETIC PROPERTIES OF NON-ORIENTED GRAIN STEELS
In a previous research project it has been demonstrated in the laboratory that it is possible to improve the magnetic permeability and energy losses of a 1% Si non-orientated grain steel by ensuring better crystalline texture, provided that : a) the composition of the alloy is modified by microadditions of Sn and Sb; b) the hot strip is heated to at least 950 C for four minutes to favour segregation of these elements before cold rolling. The main objective of the research reported here was to make a works-scale check on the magnetic characteristics of strip with the same chemical composition and made in the same way as described at the conclusion of the laboratory experiment. Another objective was to discover whether it is possible to replace costly annealing of the hot-rolled strip by high temperature coiling of the rolled strip, which is far more economical. The research project also involved a careful investigation of the way microstructure affects magnetic characteristics; the investigation included the use of unconventional measurements such as rotation losses.
Bibliographic Reference: EUR 12206 IT (1989) 51 PP., MF, ECU 4, BLOW-UP COPY ECU 7.50 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
Record Number: 1989128035100 / Last updated on: 1992-08-10
Original language: IT