Method for using flux and slag deoxidizer in ESR process

摘要

A method of controlling contamination of, and alloy variations in the remelted product of an electro-slag refining (ESR) or remelting process. More particularly, this invention is directed to a slag forming flux, to the timing and/or manner in which the flux is utilized during such method, and to a slag deoxidizer. The controls are achieved by the sequential additions of a (1) flux of predominantly CaF.sub.2 /Al.sub.2 O. sub.3 with the balance a mixture of SiO.sub.2 and MnO, and (2) a non- aluminum containing slag deoxidizer such as CaSi. Preferably, the flux is added in two portions about one-third at start-up with the remainder after the start-up portion has melted to form a slag blanket. As a preferred alternative, the total amount of SiO.sub.2 /MnO of the flux is added with the start-up portion and the remainder portion comprises essentially only CaF.sub.2 /Al.sub.2 O.sub.3.