Accession Number:

AD0724987

Title:

Change in the Technology of Smelting Ball-Bearing Steel in Electric-Arc Furnaces,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1971-01-29

Pagination or Media Count:

12.0

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

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE