NLMK jsc, Lipetsk, Russia:

V. A. Pimenov, Ph.D., Chief Expert of Rolling Production

A. S. Lukin, Ph.D., Head of Roll-Mill Shop,  lukin_as@nlmk.ru

M. E. Orekhov, Head of Laboratory

A. V. Sigorskikh, Head of Office

M. I. Shkatov, Engineer

Description of Novolipetsk Integrated metallurgical Works (NLMK) production process features for cold-rolled high-strength rolled steel products of diverse grades has been given. Several types of high-strength steel are produced at plant serially or are in adoption stage of new production processes: low-alloyed cold-rolled steels with various characteristics up to steel with no less than 400 MPa yield point; high-strength (HC420LA) and high punch (HС220Y and HС260Y) IF-steels with ultra low carbon and nitrogen concentration and titanium, manganese, phosphorus, silicon and boron additives; steel with BH-effect. Strengthening curves and mechanical of HC420LA steels are analyzed. Technical procedure for production of high-strength HC420LA steels are optimixed what allowed to increase rolling speed from 300 to 750 m/min and to decrease rolling forces. Optimal technological conditions for hot rolling and annealing of strengthened rolled products from IF steels HC220Y are chosen. Dual-phase rolled products from H380X and HCT600X steels with continuous annealing are manyfactured. At present time NLMK has technical facilities and production technology for cold-rolled high-strength flat in accordance with EN 10268 (SEW 093), duplex steel flat in accordance with prEN 10338 (SEW 097).

1. Yakubovskiy O. N., Falkon V. I. Proizvodstvo prokata - Rolling. 1999. No. 4. pp. 22–27.

2. Yakubovskiy O. N. Proizvodstvo prokata - Rolling. 1999. No. 6. pp. 37–42

3. Skorokhodov V. N., Burko D. A., Bobylev M. V., Pimenov V. A. Proizvodstvo prokata - Rolling. 2002. No. 2, pp. 30–33.

4. Sarychev A. F., Papshev A. V., Zlov V. E. et al. Stal - Steel. 2004. No. 12. pp. 90–92.

5. Benyakovskiy M. A., Maslennikov V. A. Avtomobilnaya stal i tonkiy list (Automotive steel and thin sheet). — Cherepovets : Izd. dom «Cherepovets», 2007.

6. Golovanenko S. A., Fonshteyn N. M. Dvukhfaznye nizkolegirovannye stali (Biphase low-alloyed steel). — M. : Metallurgiya, 1986. — 207 p.