Flexible minimum energy utilization electric arc furnace system and processes for making steel products

摘要

In an electric arc furnace system for making steel, a method and structure (1) for eliminating teeming hang-ups and ensuring temperature homogeneity in a ladle which teems into an ingot mold by gas purging at all possible steps under both atmospheric and vacuum conditions, and (2) for preventing non-metallic inclusions from appearing in the final product by deflecting the granular material in the teeming ladle well block away from the ingot mold by a heat resistant but combustible deflector just prior to entry of the teeming stream into the ingot mold.

主权项

1. In a bottom pour mold system for producing a batch of very pure substantially uniform temperature alloy steel, said system having a single electric arc furnace, a ladle metallurgical furnace, vacuum degassing means and a bottom pour mold system having a pouring trumpet, a method consisting of the steps of
forming a furnace charge consisting entirely of scrap to make a completely molten batch of steel in the electric arc furnace, providing a tapping ladle for receiving the batch of molten steel from the electric arc furnace, passing an inert gas upwardly through the tapped steel in the tapping ladle as the steel is tapped from the electric furnace into the tapping ladle, moving the tapping ladle containing the batch which has been subjected to the inert gas during tapping to the ladle metallurgical furnace, passing an inert gas upwardly through the batch while said batch is subjected to treatment in the ladle metallurgical furnace, and thereafter, following ladle metallurgical furnace treatment of the batch, subjecting the batch to the combined effect of vacuum and an inert gas in the vacuum degassing means, and thereafter teeming the batch into the pouring trumpet of the bottom pour mold system.