Abstract: In order to transform oxide inclusions in tire cord steel to plastic inclusions with low melting point, the compositions of inclusions, molten steel and top slag were studied in laboratory. On this basis, technical program of industrial test was proposed, and the industrial tests were carried out. With these studies, the components of inclusions can be controlled in low melting point area, and the oxide inclusions are transformed to plastic inclusions with low melting point. The results show that, the wires are not broken for 2 000 m when the diameter transforms from 1.25 mm to 0.2 mm, and the ratio of broken wire is only 0.47 times for per ton wire in industrial production. Otherwise, there are only 3 inclusions in wires per square millimeter.

Key words: oxide inclusions, plasticization, tire cord steel, ladle slag