Steel Making Plant SMP-2

This factory was put into operation in July 2012 with the aim of increasing the production capacity of Natanz iron smelting complex and especially the production of industrial steel ingots. This factory includes a 75-ton electric arc furnace, a LF furnace unit, a vacuum oxygen decarbonization unit (VOD) and a continuous casting station and ancillary units.

 

Furnace:

Electric arc furnace of AC type, discharge from the floor and capacity of 80 tons.

The type of movement of the furnace is hydraulic and with a discharge angle of 18 degrees forward and 10 degrees backward. The movement of the electrodes is electro-hydraulic and the speed is controlled by 120 mm/sec, and the type of axes holding the electrodes is from the German Fuchs model.

This furnace is of UHP series, the primary transformer voltage is 33kv/50hz with 63MV power.

Discharge of melt from the valve EBT is done under the furnace and slag removal is done from the front door with the furnace tilting backwards. The furnace door opens and closes with a hydraulic controllable movement, and the gases and smoke are transferred from the movable connected channel on the furnace door to the dust collection system of the factory.

Ladle Furnace or LF

Secondary metallurgy operations are carried out in the Patili furnace unit. Secondary metallurgy means performing the processes of degassing, removing inclusions, creating the desired chemical composition, homogenizing the melt in terms of temperature and chemical composition, and generally refining and refining the molten steel that is left out of the furnace. Main (primary metallurgy) takes place and is a specialized work .

Patili furnace type, open type, where argon gas is blown from the bottom of the potil. The smoke and gases are transferred to the dust collection system through a channel like a melting furnace.

 

Continuous casting machine

The purpose of continuous casting is to transform molten steel into steel billets or ingots with the lowest energy consumption, the best quality and high efficiency, and includes the following operational steps:

  • transfer of molten steel to the casting branches through the middle pan
  • Shaping the desired ingot or casting section by cooling with water in a copper casting mold (crystallizer)
  • Continue cooling the casting branches with water spray from under the mold in the secondary cooling area
  • Stretching and straightening of casting branches
  • Cutting and transferring the casting ingot to the cooling bed

After reaching the desired temperature and chemical composition, the molten content of the bottle is sent to the casting station, and the melt inside the bottle is in the tandish or the middle bottle that is located on top of the molds and is used as a holding and dividing container and finally the molten filter is filtered. It is poured. The amount of melt output from the pot to the tundish must be kept constant. The level of the melt in the tundish is controlled by a radiometric receiver embedded in the mold assembly. The melt from the tundish enters the copper mold, which is cooled by water (crystallizer), through specific nozzles, and with the loss of heat, an initial freezing crust is formed between the surface of the mold and the melt, which keeps the frozen crust of the melt until it exits the mold. maintains. After leaving the crystallizer, the solid shell along with the melt is cooled by direct water spraying in the secondary cooling area, and the molten phase inside turns into a solid and the freezing process is completed.

The output ingot from the continuous casting machine is transferred to the cooling bed after being cut to the desired length, so that hot and cold inspection procedures can be performed on it by the quality control unit and after confirming the delivery of the product to the warehouse.

The continuous casting machine of this factory is made by the Swiss Concast company, which is one of the most modern continuous casting lines and has the following specifications and advantages:

The possibility of quick replacement of parts, high automation, molds manufactured by Diamould company, pneumatic vibrating system of the mold and advanced cooling system, cutting system with hydraulic scissors and cooling bed with hydraulic drive.