Magnesia nozzles for high-speed steelcasting produced by vibropressure molding

Conclusions

The article describes the design development of steelcasting nozzles with a channel diameter of 120 mm and the development of the production technology for these nozzles. With these nozzles the stopper and batching device functions efficiently during the casting of rimmed and semikilled steel. The configuration and diameter of the nozzle channel undergo no changes in the process.

The increase in the channel diameter from 100 to 120 mm results in the average linear speed at which the ingot mold is filled increasing from 3.8 to 5.2 m/min; in a decrease by 32% in the pouring time per melt (from 25 to 17 min) so that the work load on the cranes is reduced and the handling capacity of the casting bay is increased; in a 15% increase in the durability of the ladle lining which gives a saving of 100,000 rubles/yr as a result of lower refractories consumption; and in less spoilage of billets and strip steel.

The end result is that the net cost of the rolled product decreases by 0.35 ruble/ton.