Esr Steel Deoxidation and Slag Practice: Influence on Inclusion Morphology

摘要

The electroslag refining (ESR) operations 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 (CaF2 + CaO + MgO + Al2O3) slags or for those containing up to 10% silica, whether they were combined with aluminum, calcium silicide or Hypercal deoxidation treatment. Trends were towards slightly increased amounts of globular type D inclusions and reduced aluminate levels when using calcium silicide deoxidation, while with aluminum deoxidation slightly higher aluminate levels were recorded. In most instances the globular type D inclusions were 6 to 9 microns in diameter and similar to the modified inclusion types observed after conventional calcium ladle modification.