Melt Shop

Electric Arc Furnace Cover

Electric arc furnace cover is made of refractory bricks;

It has a certain ability to resist internal and external pressure and withstand high temperature;

Reinforced sealing design to prevent boiling overflow;

The structure design of water-cooled slag hanging in the triangular area improves the bearing capacity of high temperature radiation and impact, and improves the overall service life of the furnace cover;


Electric arc furnace cover, that is the steelmaking furnace cover, is composed of a water-cooled cover (or a refractory brick cover), an electrode sealing ring, a feeding water ring and a water-cooled reinforcement ring.


Design, Manufacture And Furnace Cover Precautions For Use

1: The position design of electrode process holes, feeding process holes and dust removal process holes should be reasonable;
2: The furnace cover should have a certain ability to withstand high temperature, operating vibration and internal and external pressure;
3: Pay attention to the sealing of each process hole and the interface with the furnace shell.


Electric Arc Furnace Cover Mainly Process Parameters

D is the diameter of the furnace cover;
Φ is the diameter of the electrode center circle;
d is the electrode hole diameter;
h is the arch height of the furnace cover.


Several Different Types of Electric Arc Furnace Covers.


1: Full brick furnace cover with independent electrode hydrosphere type

The Figure 2 is the most traditional electric arc furnace brick body cover, which is an electric arc furnace cover built with refractory bricks on the arched tire according to a certain masonry process.

On the diameter of the center circle, according to the equilateral triangle distribution, the electrode process holes are opened.

Generally, the feeding holes and the dust removal holes are opened near the furnace door or opposite the No. 2 electrode.

All process holes should be equipped with corresponding water-cooling protection rings, and each water-cooling ring structure is self-contained and does not interfere with each other.

In order to reduce the influence of the magnetic hysteresis phenomenon, the electrode water cooling ring and the electrode closed ring should also be made into an open circuit type, as shown in Figure 3.

Due to the influence of various factors, the central triangular area of the brick cover of the electric arc furnace is the weakest, and the service life of the cover is relatively low.

There is also a more serious problem: the vaulted brick furnace cover cannot withstand the pressure from the inside to the outside.

When the carbon-oxygen reaction in the oxidation period is not well controlled and a “big boil” occurs, the pressure from the inside to the outside will be very large, causing the furnace cover to be damaged and collapsed, and accidents that cause explosions often occur.

Therefore, when using this type of furnace cover, it is not only necessary to strengthen the observation of the damage in the triangular area, replace the furnace cover in time, but also strengthen the control of the oxidation intensity of molten steel, and strictly prohibit the oxidation of low-temperature ore.


2: Half-brick furnace cover with central water-cooled triangular area

Figure 4 is an improved furnace cover of the above-mentioned full-brick furnace cover, which we call the central water-cooled triangular-type half-brick furnace cover.

The biggest difference from the full brick furnace cover is that the three independent electrode water circles become a central water-cooled triangular area of an integral structure, and the electrode cover bricks made of refractory materials are added.

The central triangular area of the electric arc furnace cover is the weakest part that affects the life of the brick cover.

The central triangular area of the furnace cover is designed as a water-cooled slag structure, which improves the ability of the furnace cover triangle area to withstand high temperature radiation and vibration shock, greatly prolongs the life of the furnace cover triangle area, and thus improves the overall service life of the furnace cover.

Therefore, when choosing a furnace cover, priority should be given to quality, craftsmanship, design, etc., and then choose a suitable supplier according to budget and after-sales. After all, quality guarantees safety and productivity.


Electric Arc Furnace Application Range


HANI Metallurgy is an experienced Chinese manufacturer of electric arc furnaces.

Committed to providing high quality EAF and its auxiliary equipment/spare parts.


Available Range

1 ton, 6 tons, 15 tons, 40 tons, 70 tons, 100 tons, 120 tons, 200 tons, 250 tons, 300 tons, 420 tons,
And various high-power / ultra-high-power electric arc furnaces according to customer requirements.


Smelting Range

The electric arc furnace can not only smelt high-quality steel with low phosphorus, sulfur and oxygen content, but also can be alloyed with a variety of elements (including easily oxidized elements such as lead, boron, vanadium, titanium, and rare earths) to produce various high-quality steels and alloy steels.

Such as ball bearing steel, stainless acid-resistant steel, tool steel, electrical steel, heat-resistant steel, magnetic materials and special alloys.



For the melting of alloy steel, stainless steel, carbon structural steel and high-quality carbon steel, HANI Metallurgy can provide “turnkey” service of production line design, workshop layout, equipment manufacturing, installation and commissioning according to customer requirements.

It can also design, manufacture, transform and upgrade its existing smelting production equipment according to user requirements.