Steelmaking by the Electroslag Process Using Prereduced Iron Ore Pellets.
U S Pat 3 997 332 1976 Dec; :
Structurally sound steel ingots are produced by the conventional electroslag process using prereduced iron ore pellets containing as much as 2.8 pct oxygen pressed into a bar shape as a consumable electrode. A carbon source, such as silicon carbide or titanium carbide, is dispersed in the flux to prevent oxygen transfer from the flux to the ingot thus preventing blowhole porosity caused by the oxygen and allowing production of a structurally sound ingot. Alternatively, ferroalloys can be mixed with the iron ore pellets before pressing. This not only deoxidized the melt, but also permits the production of specific alloy steel compositions.
U.S. Pat. 3,997,332, Dec. 14, 1976; Chem. Abstr. Not Found