Steel factory

Steel factory
The electric arc steel factory was put into operation in 1351.

In recent years, with the implementation of the first phase of the renovation plan, the annual nominal capacity of the factory has increased to 430,000 tons, which will reach 860,000 tons per year in the next phase of the development plan. The raw materials of the factory are supplied from sponge iron, briquettes, ferroalloys, scrap iron and additives. The products of the factory are steel ingots with a cross section of 100*100, 130*130, 150*150 and 160*160 square mm and a length of 4 to 12 meters.

This factory is currently using 1 60-ton electric arc furnace and LF furnace and a continuous casting station, according to common standards, ingots of 160×160, 150×150, 130×130, and 100×100 mm ingots and with Produces a length of 4-8 meters. The raw materials of these factories are generally scrap and sponge iron, and the ingots produced in these factories are used as raw materials for rebar and wire rolling factories and iron beam rolling factories.

The steel factory consists of 3 main sections and 4 side sections:

1- Electric arc furnace
Steel production starts from the electric arc furnace. In the first stage, the scrap is charged into the furnace by a special basket that is filled in the scrap area, and the melting process begins with the lowering of the graphite electrodes and the establishment of the arc. Sponge iron, alloy materials and lime are added to the melt by the material feeding system through the funnel above the furnace. With the complete melting of the scrap, its volume is reduced and enough space is created for recharging the scrap. At this stage, the furnace cover is removed and the scrap iron is charged again in the furnace. With the completion of the melting process, the temperature of the furnace is raised to about 1640 degrees Celsius to be ready for discharge. In this stage, which is called “correction of the composition”, some metallurgical operations such as dephosphorization, decarbonization and addition of alloy elements are carried out and the melt is ready to be sent to the furnace. The melt is prepared and the high temperature is discharged through the valve installed in the nose of the furnace into the crucible placed under the furnace.

2- Patili furnace
Secondary steelmaking operation is a critical step in steelmaking. At this stage, the chemical composition and temperature of the melt are adjusted and ready to be sent to casting. Addition or removal of alloy elements to the melt is done in the Patili furnace, and in addition, the temperature of the melt is also adjusted. The molten pot is transported under the pot furnace by a crane and a ladle car. By lowering the graphite electrodes and establishing the arc, the necessary energy is provided to adjust the temperature of the melt, and the alloy materials are added to the melt after weighing in the material delivery system through the funnel attached to the furnace cover. By blowing nitrogen gas, it is combined from the bottom of the pan and the temperature of the melt is homogenized.

3- Continuous casting
Molten steel is fed to the continuous casting through the secondary steelmaking workshop. The eldal is moved by a crane and sits on a ladle turret that places the eldal in the casting position. By opening the valve at the bottom of the crucible, the molten steel enters the tundish. Tandish acts as an intermediary between the plate and the mold. When the tank is full, the nozzles are opened and the steel is poured into the copper molds that are under the tank and cooled with water. After being separated from the mold, the steel strand must have skins thick enough to support the weight of the liquid steel in it. The strand is separated from the mold with the help of a number of rollers. The rollers guide the steel in an arc until the strand becomes horizontal. After the steel is completely cold and solid, it is cut to the required dimensions.

Side sections include:

Scrap unit: supply, processing and sending scrap and sponge iron to arc furnace
Water supply: preparation and water required for cooling systems of the entire complex
Oxygen: providing oxygen and nitrogen required by the factory, from air decomposition
Dust collector: purification and separation of suspended particles and poisonous vapors from exhaust gases