Electric Arc Furnace Roof: Component Overview and Specifications

Product Specifications

Technical details and manufacturing context for Roof

Definition

The roof is a critical structural component of an electric arc furnace (EAF) that forms the top enclosure of the furnace vessel. It serves to contain the high-temperature melting process, support the electrode system, and provide openings for charging, fume extraction, and observation. The roof is subjected to extreme thermal cycling, chemical attack from furnace gases, and mechanical stress from electrode movement. Constructed from water-cooled steel panels, a refractory lining, and high-temperature alloy structural supports, the roof is designed to withstand the harsh operating environment. Typical parameters for an EAF roof include a rated capacity of 50–120 tonnes, a working temperature range of 300–800°C, and a cooling water flow rate of 80–200 m³/h. The cooling water inlet temperature is typically 25–35°C, with a pressure of 0.3–0.6 MPa. Roof dimensions vary with furnace size: diameter ranges from 4–8 meters, height from 1.5–3 meters, and refractory thickness from 200–400 mm. Electrode hole diameter is 400–800 mm, with a pitch circle diameter of 1200–2000 mm. The total roof weight, including refractory and steel structure, is 20–60 tonnes. For maintenance, the roof can be lifted with a stroke of 300–500 mm and swung at an angle of 75–90°. The structural steel for the roof frame is typically Q235B per GB/T 700. These values are reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The roof's design must ensure proper sealing, cooling, and electrode alignment to maintain efficient furnace operation.

Working Principle

The roof functions as a sealed or semi-sealed barrier that maintains the furnace atmosphere and contains heat. It supports the electrodes that pass through it, allowing for precise positioning during the melting process. Cooling systems (typically water-cooled panels) integrated into the roof manage the intense radiant heat from the arc and molten metal. The roof also facilitates the removal of process gases through an offtake system. The water-cooled panels circulate cooling water at specified flow rates and pressures to absorb heat and prevent structural failure. The refractory lining provides thermal insulation and protection against chemical attack. The roof's design must accommodate thermal expansion and mechanical stresses from electrode movement and furnace vibrations. Proper cooling water parameters, such as inlet temperature and pressure, are critical to maintain cooling efficiency and prevent overheating. The roof's lifting and swinging mechanisms allow for access to the furnace interior during maintenance and electrode changes.

Common Materials

Water-cooled steel panels, Refractory lining, High-temperature alloy structural supports

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	50–120 t	Typical EAF roof capacity range
Working Temperature	300–800 °C	Upper limit depends on refractory material
Cooling Water Flow Rate	80–200 m³/h	Required for panel cooling
Cooling Water Inlet Temperature	25–35 °C	Higher inlet reduces cooling efficiency
Cooling Water Pressure	0.3–0.6 MPa	Ensure adequate flow
Roof Diameter	4–8 m	Matches furnace shell size
Roof Height	1.5–3 m	Affects freeboard and electrode stroke
Refractory Thickness	200–400 mm	Thicker for longer life
Electrode Hole Diameter	400–800 mm	Must match electrode size
Electrode Hole Pitch Circle Diameter	1200–2000 mm	Determines electrode spacing
Roof Weight	20–60 t	Includes refractory and steel structure
Lifting Stroke	300–500 mm	For roof swing and maintenance
Swing Angle	75–90 °	For electrode access
Material Grade	Q235B	Structural steel for roof frameGB/T 700

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Water-Cooled Panels
Form the main structural body of the roof and provide primary heat removal through circulating water.

Material: Carbon steel or low-alloy steel with internal water channels
Refractory Lining Part
Insulates the steel structure from direct radiant heat and chemical attack from furnace atmosphere.

Material: High-alumina or magnesia-based castables or bricks
Electrode Ports
Circular openings that allow electrodes to enter the furnace; include seals and cooling rings.

Material: Water-cooled copper or steel alloy rings
Charging Door Opening Part
Opening for charging scrap and additives; often equipped with a water-cooled door.

Material: Water-cooled steel frame and door
Fourth Hole (Offtake) Part
Opening for the direct evacuation of furnace gases to the fume extraction system.

Material: Water-cooled steel duct connection
Lifting Lugs / Trunnions Part
Attachment points for the roof lifting and swinging mechanism.

Material: Forged or cast steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Electric Arc Furnace

View system integration details

Manufacturers of Roof

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Frequently Asked Questions

What is the primary function of an EAF roof?

The primary function is to enclose the furnace vessel, contain the high-temperature melting process, support the electrode system, and provide openings for charging, fume extraction, and observation.

What materials are commonly used in EAF roof construction?

Common materials include water-cooled steel panels, refractory lining, and high-temperature alloy structural supports. The structural steel frame is often Q235B per GB/T 700.

What are typical cooling water requirements for an EAF roof?

Typical cooling water flow rate is 80–200 m³/h, with inlet temperature of 25–35°C and pressure of 0.3–0.6 MPa. These values must be verified for the specific model.

How does the roof support electrode movement?

The roof has electrode holes with a diameter of 400–800 mm and a pitch circle diameter of 1200–2000 mm, allowing electrodes to pass through and be positioned precisely during melting.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric to slight positive pressure (0-0.5 bar gauge), negative pressure not recommended
other spec:	Water cooling flow rate: 50-200 m³/h depending on furnace size, refractory lining thickness: 300-600 mm
temperature:	Up to 1800°C (3272°F) peak, continuous operation up to 1600°C (2912°F)

Roof

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