Change in the Technology of Smelting Ball-Bearing Steel in Electric-Arc Furnaces,
Abstract
The purpose of this study was to decrease the reduction period (which took 90-100 min) when melting steel ShKh15 in electric arc furnaces of small and medium capacities (10-40 tons). Samples for 0 and nonmetallic inclusion determinations were taken at the end of oxidation period, at the start, middle, and end of reduction period, and from the ladle after tapping. Steel was deoxidized with 75 percent Fe-Si and Al (0.4 Kg-ton). The metal was deoxidized under white slag. The slag was deoxidized with coke powder Fe-Si and Al (10 min before tapping). Al (0.5 Kg-ton) was added to the metal just prior to tapping. Significant elimination of O and S occurred during the first 40-60 min. of the reduction period; however, holding the steel under white slag was ineffective. Decrease of the reduction period by 25-30 min. (to 60-70 min) did not deteriorate the quality of steel ShKh15, provided the deoxidation was intensified during the rest of the reduction period. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 29, 1971
- Accession Number
- AD0724987
Entities
People
- D. Ya. Povolotskii
- N. V. Keis
- V. N. Lyubimov
- Yu. A. Gudim
Organizations
- National Air and Space Intelligence Center