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

Lutsenko V. A., Cand. Eng., Senior Research Fellow of the Machine-Building Metal Heat Treatment Dept., lutsenko@optima.com.ua

Up-to-date processing technology is characterized by rather large summarized reduction during wire rod drawing for wire (up to 99.2%), therefore solving of the problem of increase of metal technological ductility with reservation of required final parameters and accompanying saving of power resources due to exception of intermediate heat treatment out of technological process is quite actual. Wire rod of nickel-molybdenum steel has been subjected to different procedures of thermomechanical treatment in the line of 150-1 rolling mill at “Arcelor Mittal Krivoy Rog”; these procedures included high-speed rolling with usage of finishing block (rolling speed up to 80 m/s), accelerated water cooling of wire rod with consequent different speed of coil cooling at Stelmor roll transporter (equipped with heat insulating covers. Wire rod temperature at layer head was varied in the range of А₁+(20…220 ^oС). There are results of researches of the mechanical properties and structure of the wire rod made of lowcarbon nickel-molybdenum steel after thermomechanical treatment with softening (toughness reduction) in the line of high-speed wire rod mill. The ability to realize the mechanism of dislocations transference through the martensite and baynite structure areas by superposition of deformation effect is represented. It is established, that the minor quantity of areas (up to 10%) of beynit and martensite structure and the mechanism of dislocations transference through these areas provide the high plastic properties of rolled wire during deformation measurements.

1. Bernshteyn M. L., Zaymovskiy V. A., Kaputkina L. M. Termomekhanicheskaya obrabotka stali (Thermomechanical treatment of steel). Moscow : Metallurgiya, 1983. 480 p.
2. Starodubov K. F., Uzlov I. G., Savenkov V. Ya. et al. Termicheskoe uprochnenie prokata (Thermal strengthening of rolled metal). Moscow : Metallurgiya, 1970. 368 p.
3. Parusov V. V., Sychkov A. B., Lutsenko V. A. et al. Metallurgicheskaya i gornorudnaya promyshlennost — Metallurgical and Mining Industry. 2003. No. 6. pp. 54–56.
4. Nesterenko A. M., Sychkov A. B., Zhukova S. Yu. Metallurgicheskaya i gornorudnaya promyshlennost — Metallurgical and Mining Industry. 2006. No. 6. pp. 60–63.
5. Golovanenko S. A., Fonshteyn N. M. Dvukhfaznye nizkolegirovannye stali (Diphasic low-alloyed steels). Moscow : Metallurgiya, 1986. 207 p. 
6. Lutsenko V. A., Parusov V. V., Polyakov V. A. et al. Metallurgicheskaya i gornorudnaya promyshlennost — Metallurgical and Mining Industry. 2004. No. 3. pp. 68–71.
7. Lutsenko V. A., Sivak A. I., Zhuravlev I. I. Metaloznavstvo ta obrobka metalіv — Metal science and metal treatment. 2005. No. 3. pp. 27– 29.
8. Zavyalov A. S., Teplukhin G. I., Gabeev K. V. Metallovedenie i termicheskaya obrabotka metallov — Metal Science and Heat Treatment. 1979. No. 10. pp. 11–12.