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STEELMAKING FACILITIES

 

  Steelmaking technical capabilities allow to obtain forging ingots with weight from 1,6 to 170 tons and up to 200 tons of liquid metal for steel castings production.

  Steelmaking facilities consist of:

  • 1 Electric arc furnace EAF, capacity 50 tons;
  • 2 Electric arc furnaces EAF, capacity 12 tons;
  • 1 Electric arc furnace EAF, capacity 5 tons.
  • 2 Ladle steel refining units;
  • Vacuum steel treatment based on steam jet pump and 4 vacuum vessels including VD and VOD vacuum vessel.

 Metal smelting is performed atsteelmaking units within minimum time with subsequent treatment at Ladle furnace unit and vacuum treatment.

Depending on preset chemical composition and required properties of the steel the casting process can be performed either in vacuum – from the top or in the air – from the bottom.
   
 
 
SECONDARY REFINING UNIT "LADLE FURNACE"
     
 

  Ladle furnace unitis equipped with casting ladles of two standard sizes: 60, 90 tons enabling to perform secondary refining of 88 tons of steel and to cast forging ingots with weight up to 170 tons. During secondary refining process the chemical composition is corrected, the metal is heated and treated with flux core wire  by using wire feeder, and with argon blow, that reduces nonmetallic inclusions and gase content in metal.

  • Nonmetallics content in steel after secondary refining
    		•  - up to 20 ppm;
  • Sulphur content
    		•  - up to 0,005%;
  • Steel temperature differential across ladle section
    		•  - max 5°C;
  • Homogeneous chemical composition of the metal is maintained throughout entire ladle capacity.
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    STEEL DEGASSING UNIT
         
        Metal treatment in vacuum vessels enables to realize vacuum casting of the ingots from  21 up to 170 tons in weight.

      Vacuum vessel No 4 is equipped with argon,oxygen, nitrogen feed system; wire feeders for steel inoculation with powdered materials; rolling cover with video control system; water-cooled oxygen lance; sampling device for steel chemical composition examinatio, gas content and metal temperature measurement in vacuum.

     This equipment enables to realize steel treatment according to VD and VOD patterns. By means of VOD technology the high-chromium steel is obtained with carbon content <0,03%. For steel vacuum treatment in the ladle (VD pattern) the unified gate ladles stock of the Ladle Furnace Unit  is used (60, 90 t capacity).

      Gas content after vacuum treatment:

  • oxygen (О2)
    		•  - 15..35 ppm
  • hydrogen (Н2)
    		•  - < 1,5 ppm
  • nitrogen (N2)
    		•  - 40..80 ppm 

     Steel quality level is in conformity with high international standards.
       
     
         
    MANUFACTURING SCHEME OF HIGH QUALITY STEEL PRODUCTION