Tap-Hole Clays added with Ferrosilicon Nitride were developed to increase productivity and quality of metals produced in blast furnaces. Tap-Hole and gutter materials made with the addition of Ferrosilicon Nitride proved to be highly effective and are widely used by the leader companies of the steel industry that aim high performance for the blast-furnace production. Ferrosilicon Nitride content vary from 5 to 30% depending on the operating conditions, mainly the size of the blast furnace and the conditions of hot-metal and slag discharge.

Relation between level of Si3N4 and corrosion rate of tap-hole clays.

Relation between level Fe-Sin and corrosion rate of tap-hole clays.