BMZ. About the company. Structure

Electric steel-making shops

three electrical arc furnaces 100t each with transformers 75 and 95 MBA; secondary metallurgy unit: two ladle-furnaces, circular and ladle degasser;
three continuous casting machines:
two 6-strands machines of radial type;
4-strand radial type bloom caster;
stands for lining, drying and heating of casting ladles and tundishes;
stands for scrap handling and removing from tundishes;
stands for liquid slag drainage from ladles;
section for repairing of circular degreaser's refractory line;
mold repairing and assembling workshop;
repairing and assembling section for sliding shutter;
department for repair and assembly of slidegates;
ferroalloys and loose material warehouse (shop №1)
storage hopper for pellets storage (shop№2).

STEEL PRODUCTION

Steel making technology has the following flow chart: "electrical arc furnace - ladle - furnace - ladle - vacuum degasser" and all functional tasks and aims are distributed among the units. From the point of view of power saving and science intensity, our steel making technology corresponds to world novelty criteria and allows us to produce wide range of high-quality steel grades, meeting the strictest requirements of our customers.

Liquid steel production process and the following production of concast billets consists of 3 stages. On the first stage metal charge is melted in electrical furnace. The "one-slag" technology is used for steel melting. Liquid metal in the furnace is heated up to the preset temperature, and then poured into ladle simultaneously with necessary components (ferroalloys, deoxidizing agents and slag-forming materials). Thus metal with intermediate chemical composition is obtained.

On the second stage, using such technological assemblies as furnace-ladle and vacuum degasser, metal in the ladle is refined, heated to the required temperature and correction of specified chemical composition is made, in order to produce steel of high quality. On the final stage of the process, steel is cast on continuous casters into billets of different cross-sections, depending on type of casting machine (125x125; 250x250 and 300x400mm). Monitoring and control of steel melting and casting processes are performed by modern automatic control systems.

New advanced methods and techniques in the development of steel making are successfully used in the plant's practice (system of eccentric bottom tapping of steel, liquid steel blowing with inert gas during melting via furnace bottom, modifying of steel with tube wire, use of highly durable refractory materials, implementation of efficient technological process control and management methods, electromagnetic stirring in mold of bloom casters, etc.)

After cooling, concast billets are conveyed to warehouse for control and certification. Then certified billets are used in rolling production for further processing, or with the length from 8 till 12m. , shipped for export, in accordance with customers requirements. Billets used in rolling production have the length of 12m.