A METHOD FOR MANUFACTURING GRAIN-ORIENTED Si-STEEL SHEET WITH HIGH MAGNETIC PROPERTY

摘要

This invention relates to a method for producing a grain-oriented silicon steel sheet used as an iron core of electrical equipment such as transformers, in the manufacture of a directional silicon steel sheet containing an appropriate amount of Sb to form a grain boundary segregation in the steel-making process and the slab reheating temperature and and Al, for properly controlling the N content to complete the solution heat to take place, a suitable amount of nitrogen into the cavity after the cold rolling By incubation, for to prepare a directional silicon steel sheet having excellent magnetic properties, has the purpose ; to the present invention for achieving the above object, ; in weight% Si.: 2.0 ~ 4.0%, C: less than 0.07%, Mn: 0.01% or more, P: not more than 0.02%, Sb: 0.01 ~ 0.12%, Al: 0.015% or less, balance Fe and other unavoidable impurities, the steel slab is made of a mixed re-heating the hot-rolled and then cold-rolled once or twice and including intermediate annealing, decarburization annealing, and subjected to nitrogen-enriched treatment at the same time or one after another, the total amount of N is 150 and magnetic properties is made so as to include 250ppm and a method of manufacturing a directional silicon steel with superior technical base.