Instutute of Ferrous Metallurgy named after Z. I. Nekrasov, Dnepropetrovsk, Ukraine:

Lutsenko V. A., Senior research fellow of the machine-building metal heat treatment dept., Cand. Eng.

Lutsenko O. V., Junior research fellow of the dept. of problems of structure forming and properties of ferrous metals, post-graduate

E-mail: lutsenko@optima.com.ua

Byelorussian Steel Worls - Management Company of Byelorussian Metallurgical Company Holding:

Murikov M. A., Нead of technical administration

Bobkov P. A., Нead of the section rolling shop

Gritsaenko V. I., Нeat of the dept. of scientific and technical information

Use of the new configuration of finishing group of stands having the block design with divisibility of deformation and with the system of intra-block control of temperature of rolled billets allows to reduce deviation of mechanical properties, to reduce depth of the decarburized layer with its uniform distribution along the perimeter of wire rod surface. Wire rod with diameter 5.5 mm made of high-carbon steel has been used in this work for manufacture of high strength bead wire and steel wire cord. Additional alloying with chromium increases the dispersion of pearlite, while decrease of manganese content leads to lowering of strength properties. It was revealed that lowering of temperature after hot rolling from 1000–1100 ^оC to 850–930 ^оC leads to decrease of tensile strength of high-carbon steel that depends on divisibility of deformation and is caused by diminishing of austenite grain size and pearlite dispersity. Transformation of austenite in commercial high-carbon steel (with chemical composition shown in the Table 1) has been examined in laboratorial conditions on the base of combined analysis of dilatograms and microstructural investigations. Additional usage of reducing and sizing block in the finishing part of rolling technological line during production of high-carbon wire rod with consequent thermomechanical treatment (temperature at the laying head was in the range 930 ± 15 ^оC) allowed to provide rise of metal technological ductility plasticity in wire production.

1. Toshimi T. Microstructure control and strengthening of steel cord. Ferrum. 2006. 11, No. 12. pp. 791–797.

2. Solntsev Yu. P., Afonin V. K., Ermakov B. S. et al. Metally i splavy: spravochnik (Metals and alloys : reference book). Saint Petersburg : Professional, 2007. 853 p.

3. Bernshteyn M. L., Zaymovskiy V. A., Kaputkina L. M. Termomekhanicheskaya obrabotka stali (Thermomechanical processing of steel). Moscow : Metallurgiya, 1983. 480 p.

4. Lutsenko O. V., Nesterenko A. M., Chernichenko V. G. et al. Obrabotka materialov davleniem — Materials pressure treatment. 2010. No. 4 (25). pp. 182–186.

5. Parusov V. V., Lutsenko V. A., Sychkov A. B. et al. Metallurgicheskaya i gornorudnaya promyshlennost — Metallurgical and Mining Industry. 2003. No. 5. pp. 61–64.

6. Lutsenko V. A., Parusov V. V., Andrianov N. V. et al. Stal — Steel in Translation. 2004. No. 10. pp. 68–70.