Abstract
Studies of the wire rod currently being made at the MMK revealed the presence of nondeformable nonmetallic inclusions as large as 52 µm. The rod was also found to contain aluminates with an Al2O3 content greater than 50% and particle sizes greater than 5 µm (6 and 8 µm). Such rod does not meet the requirements established for metal cord. A collaboration with specialists at the company Kordinvest made it possible to determine the requirements that must be met when cord steel is deoxidized with ferroalloys and other materials. In terms of the purity of these materials, the main restrictions are on the allowable concentrations of S, P, Al, and Ti and the gases N and H. A new technology has been developed for making cord steel and treating it outside the furnace, and a trial batch of this steel was made and cast on a continuous section caster in an “open” stream. The company Uralkord has used a trial batch of cord-grade wire rod to make metal cord 15L24. The cord meets all the existing specifications.
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