Electric Arc Furnace

Electric Arc Furnace



General Information
Electric Arc Furnace

INTECO’s design solutions for its EAF units are focused on the development of heavy-duty equipment capable of withstanding both high electrical and chemical melting power density without impairing quality of produced steel, reliability of equipment, environment and overall safety of all the furnace operations.

Tailor made design and development activities are the starting basis to follow the path marked by the future EAF technology requirements and trends.

Thanks to the acquisition of the worldwide known FUCHS Technology , INTECO enhances its capabilities reaching the excellence in the designing  technique and operation technology of Electric Arc Furnaces and Ladle Furnaces, providing the market with the most advanced and innovative equipment for meltshops.


  • Tapping weights from 2 to more than 300t
  • Single point or three points roof lifting
  • Swing bridge with king pin or roller bearing
  • Copper or aluminum conductive arms
  • Split Fe-Cu water cooled upper shell panels and roof panels
  • Combined raw material input design (Scrap, DRI/HBI, HotMetal,)
  • Hot heel size from 0% to 40% tapping weight according to selected raw material
  • UHP index from 0.5 to 1.5 MVA/t
  • From single charge to multi bucket charge
  • Tapping systems with EBT tap hole or tapping spout
  • Tailor made design and process technology dimensioning in function of raw materials mix

USP‘s of INTECO Design

  • Inteco as unique supplier of all technical packages (full stream know-how)
  • Patented Telescope EAF (with a 165t tap EAF reference)
  • Advanced and patented integrated Scrap Preheating and EAF Furnace solutions
  • Ultra High Chemical Power input (UHChP) furnaces
  • Integrated INTECO PTI solutions for fuel and oxygen Injection
  • Integrated INTECO PTI solutions for injection of solid materials (carbon, lime, FeSi, Al powder etc.)
  • INTECO PTI SwingDoorTM system for EAF deslagging control and overall performance improvement
  • Enhanced design for the water-cooled components for increased safety and service life
  • Integrated INTECO atec ISEC electrode control system
  • Integrated melting process control
  • Integrated INTECO atec IFOB furnace optimization system
  • Safe operations
  • In-house design of furnace auxiliaries
Telescope EAF
Telescope EAF

THIS FURNACE BENEFITS from the scrap preheating effect of the burner gas generated during the melt down process due to the high scrap column in the shell. Its major advantage compared to existing single charge furnaces is the fact that the design does eliminate the need for longer or/and thicker electrodes to avoid electrode breakage due to the electrode length required for the higher shell of such furnaces.

Key Benefits

  • Innovative EAF concept for single bucket application, even with scrap density down to 0,5 t/m³
  • Telescope principle for gantry & roof lifting minimized electrode length 
  • Minimized power-off time
  • High electrical & chemical energy input leads to shortest power-on time
  • High Productivity 
  • Highest Operational Safety


  • Reduction of the total Energy input
  • Decreasing the electrode consumption 
  • Reduction of power-on & power-off time
  • Reduction of the conversion cost
  • Increasing the productivity 
  • One bucket operation at a scrap density of 0,5 t/m³ depending on the plant situation
  • Reduction of the electrical energy consumption of 30 – 40 kWh/t of liquid steel due to scrap preheating 
  • Better utilization of burner energy due to the higher scrap column
  • Less electrode breakages compared to other single bucket technologies
  • Telescope-EAF-Principle leads to maximized charging volume without increase of electrode length
  • Less total- and electrical energy input due to scrap preheating 
  • More powerful arc from the beginning of the heat 
    = higher average power input and shorter power on time as compared to other single bucket technologies

Design Feature

  • Rigid, reliable and proven EAF FUCHS-design
  • Gantry swiveling: no big roller bearing, swiveling is realized by 2 slide bearings

Telescope Principle

  • Electrode stroke is the same than in conventional EAF-applications 
  • Additional required stroke for high shell is realized by a gantry stroke 
  • Gantry stroke lifts the complete gantry with the electrode support structure & roof
Telescope Electric Arc Furnace
Average tap weight 140 t 165 t
Upper shell diameter 8500 mm 8500 mm
Lower shell diameter 8400 mm 8700 mm concial
Upper shell height 5040 mm 5040 mm
Transformer 150 MVA 165 MVA
Injectors 6 8
Charge 100% scrap /
Single bucket
100% scrap /
Single bucket
Average scrap density 0.56 t/m³ 0.56 t/m³
Tap-to-tap time 46 min 41 min
Power ON 33 min 30 min
Oxygen consumption 31 Nm3/t 27 Nm3/t
Gas consumption 2.5 Nm3/t 4.0 Nm3/t
Gas for post-consumption 0 Nm3/t 0 Nm3/t
Electrode consumption 0.95 kg/t 0.85 kg/t
Electric energy consumption 385 kWh/t 362 kWh/t
COSS Furnace – Continuous Optimized Shaft System
Continuous Optimized Shaft System (COSS)

FUCHS TECHNOLOGY AG has started up another scrap preheating furnace type, the Continuous Optimized Shaft System (COSS) to capitalize on the advantages of the current system (flat bath operation, improved power input at the beginning of the heat, low  noise, smaller transformer power, less flicker control requirements and short power off times), as well as the higher scrap preheating efficiency of the shaft furnace.

Key Benefits

  • Reduced electrical energy consumption by scrap preheating
  • Reduced electrode consumption of approx. 10%
  • Decreased Tap-to-Tap-Time leads to higher productivity
  • Independence of bucket charging from melting process:
    Charging causes no power-off time, no reactions & explosions caused by charging
  • Reduction of dust amount
  • Improved temperature control of off-gas-temperature
  • Less dust on EAF working platform – better working conditions
  • Controlled scrap quantity input through weighing system installed between wheels and COSS frame 
  • Controlled preheating temperature through off gas regulation system 
  • Controlled scrap input related to the transformer capacity through regulation of pusher speed
  • Flat Bath Operation:
  • Constant high energy input, lowest flicker generation and less noise generation
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