Abstract
Cables with a steel core 42 mm in diameter are used on hot-metal charging cranes. Heat is released as molten pig iron is poured into the converter, and the resulting superheated gases and flames (whose temperature sometimes reach 1300°C) act on the surrounding production equipment, building structures, and cables. An analysis of defects in the steel cables of such cranes has shown an increase in the incidence of rejection of these cables for technological and design-related reasons. The main reasons for the failure of cables in inspections are loss of cross section, extrusion of the strands, and curvature. The use of cables with a spring-type core makes it possible to lengthen their service life and make the formation of the defects just mentioned less likely. Cables of this type are more flexible, which improves their performance on blocks and drums. The spring-type core ensures that the cable will remain intact during service and that the lubricant will be evenly distributed among the strands.
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