Process for the production of granulacao oriented silicon steel hot rolled; process of removing the internal layer of silicon iron free development in the heating of the steel sheet to siliCIO oriented in a furnace bottom; process improvement of the surface of the silicon steel cold rolled oriented; and process for producing a strip hot rolled silicon steel to the guidesThe

摘要

Oriented silicon steel is heated in a slab furnace at temperatures above 1260 C. prior to hot rolling. The slab surfaces in the furnace are exposed to molten slag, variable atmosphere conditions and refractory interaction from the hearth. The slab surface prior to hot rolling has a major importance for cold rolling and the quality of the glass film.PPA rapid oxidation treatement of the slab just prior to the scale breaker or first rolling stand corrects a silicon- free iron layer condition which causes streaks in the glass film. The oxidation treatment blows gas having at least 30% oxygen for a sufficient time and velocity to provide a surface which will develop a continuous fayalite layer in subsequent processing and provide for the formation of a continuous glass film.