GRAIN ORIENTED ELECTRICAL STEEL SHEET HAVING SUPERIOR MAGNETIC PROPERTIES, AND MANUFACTURING PROCESS THEREOF

摘要

PCT No. PCT/AU91/00358 Sec. 371 Date Feb. 9, 1993 Sec. 102(e) Date Feb. 9, 1993 PCT Filed Aug. 13, 1991.A grain oriented electrical steel having superior magnetic properties and for use in transformers and electrical generators, and a manufacturing process thereof are disclosed. Cu and P are mixedly added in the melting stage of a silicon steel containing MnS and AlN as grain growth inhibitors, and in this way, the magnetic properties are improved. The chemical composition of the steel sheet of the present invention are: 2.50-4.00% of Si, 0.03-0.15% of Mn, 0.030-0.300% of Cu, and 0.020-0.200% of P, the balance being Fe, all in weight %. The grain oriented electrical steel sheet of the present invention shows a low iron loss and a high magnetic flux density, and is cold-rolled to a thickness range of 0.15-0.27 mm.