ESR (Electroslag Refining) Steel Deoxidation and Slag Practice - Influence on Inclusion Morphology

摘要

This report is based upon the electroslag refining (ESR) operations undertaken by the Commonwealth Steel Company, Waratah, NSW, and draws upon detailed technical records of both production and experimental operations over an extended period. A wide range of slag/deoxidant combinations used during the electroslag refining of low alloy steels was evaluated to determine the influence on the types of inclusion and their morphology in the final steel product. No significant variations in inclusion type or overall cleanliness were observed for the more conventional slags or for those containing up to 10% silica, whether they are combined with aluminum, calcium silicide or Hypercal deoxidation treatment. There were trends towards slightly increased amounts of globular type D inclusions and reduced aluminate levels when using clacium slicide deoxidation, while with aluminum deoxidation slightly higher aluminate levels were recorded.