Steel

Steel

Höganäs Borgestad is a leading supplier of high-quality refractory solutions to the Nordic steel industry.

The Company is well aware of the many production methods used in the steel industry, each with its own unique requirements. Some methods are traditional, essentially unchanged for many years, but modern methods have also been developed to meet new demands. In both cases, refractory materials are a critical part of the production process and decisive to the final product quality.

Based on long experience of high-quality refractory products and extensive expertise, Höganäs Borgestad offers both customized turnkey solutions and more standardized deliveries. The Company can take full responsibility for everything from planning to supply of consumables – own refractory bricks as well as own monolithics and other purchased products from strategic key partners. This in combination with installation services makes it possible to deliver the complete solutions that saves time and costs for the steel industry.

Applications and design solutions:

  • Coke oven, dry quenching chamber / waste gas
  • EAF Roof & ladle furnace
  • Torpedo Cars
  • Tundish & Prefabricated blocks (Tundish with firebotls)
  • Lead pot
  • Foundry ladle
  • Transfer ladle

Coke Oven, Dry Quenching Chamber / Waste Gas

This is an energy saving system in which, during quenching process, sensible heat of the red hot coke is recovered and utilized for power generation or as steam.

Coke dry quenching appears as the most valid system to reduce air pollution allowing at the same time a remarkable energy recovery or saving, especially when it is associated with coal preheating. In addition, dry quenched coke is harder and stronger, and its moisture content is much lower than that of wet quenched coke.

Coke dry quenching can be applied in principle at new and existing iron and steel plants. Coke dry quenching systems have been installed in many steel works and coke ovens.

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Upper cylindrical part Thermal shock
Alkali attack
Alex
Back up lining:
Poros
Bjuf F
Lower cylindrical part
Erosion
Thermal shock
Alkali attack
Victor 60
Alex
Back up lining:
Poros
Bjuf F
Horizontal part
Thermal shock
Alkali attack
Alex
Back up lining:
Bjuf F
Porosil 23
Poros

EAF Roof and ladle furnace

This is a furnace that heats charged material by means of an electric arc. The roof of the arc furnace is one of the most affected portion as it is subjected to all kind of stresses, e.g. thermal, chemical and mechanical. The roof is exposed to very high temperature often exceeding 1700°C. It is also exposed to corrosive action of slag and metal oxides, specially iron oxide fumes which is deleterious towards the refractories. Since the design is also complicated because of the openings of the electrodes etc. it is subjected to considerable mechanical stresses.

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Roof
Corrosion
Slag and metal attack
Mechanical stresses
Arlik 80
Mortar
Delta zone
Corrosion
Slag and metal attack
Mechanical stresses
PHLOCAST L32
Höganäs Cast LC 60

Torpedo Cars

Torpedo Cars transfer of pig iron to steel plant

Why insulation is needed:

  • Iron is delivered to the BOF at a high temperature:
    • Higher temperature of iron results in less energy to reheat the iron.
    • Higher temperature gives a more homogenous quality of iron.
  • Proper insulation allows the total lining to be thinner:
    • Thinner linings give more iron per campaign.
    • More iron in the torpedo car results in fewer fillings per day.
  • Proper insulation allows more wear of the refractory lining:
    • More wear of refractories results in longer life time between re-linings.
    • More wear of refractories results in less consumption/purchase of refractories.

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Side walls
Thermal stresses
Mechanical stresses
Chemical stresses
Victor 85 BP
Back up lining:
Viking 330
Mortar
Bottom part
Thermal stresses
Mechanical stresses
Chemical stresses
Victor 75 SIC
Alsic
Back up lining:
Viking 330
Mortar
End walls
Thermal stresses
Mechanical stresses
Chemical stresses
Victor 85 BP
Back up lining:
Viking 330
Rodarox cast
Mortar
Mouth Phlocast L32

Tundish

In the process of continuous casting, to transfer liquid steel from a steel teeming ladle to the mould, an intermediate vessel, called a tundish, is used. A tundishis a rectangular big end up refractory lined open container which may have a refractory lined cover on the top. The tundish bottom has one or more holes with slide gate(s) or stopper rod(s) for controlling the metal flow. It is used to feed liquid steel into the copper moulds of a continuous casting machine, so as to avoid splashing and give a smoother flow.

Due to the process layout, tundish refractory linings are designed to withstand thermal shock, prevent thermal loss, prevent oxidation, and resist erosion and corrosion.

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Side walls
Erosion
Corrosion
Thermal shock
Dossolite 1400-172
Morflo 170
Roof Porosil G
Tube Porosil G
Nozzel Victoria

Tundish can also be lined with Firebolts (refractory precasts) as shown in the model below.

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Our solution with firebolts for tundish is shown in the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Side walls
Erosion
Thermal shock
Höganäs Cast LC 801 (firebotls)
Back up lining:
Viking 330
Bottom part
Erosion
Thermal shock
Victor HWM
Back up lining:
Viking 330
VIP 12 HS

Lead pot

Modern steelworks involve the three production stages: steelmaking, refining, and continuous casting. In steelmaking–continuous casting, a ladle corresponds to the furnace (smelting molten steel converter) used in container production.

Ladles are generally cylindrical, with an open top, and a small offcentre casting nozzle in the base. They consist of an external steel shell (50-100 rnrn thick), and several layers of internal refractory lining (up to 400 mm). A refractory-lined steel lid can be used to cover the top of the ladle.

Under normal operating conditions, a vertical temperature gradient forms in the ladle. This thermal stratification is undesirable. It generally causes variations in casting temperature (degrading caster performance).

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Slag Zone and side walls
Alkali attack
Thermal shock
Corossion
Viking 330
Back up lining:
Porosil 23
Mortar
Bottom area
Alkali attack
Thermal shock
Corossion
Höganäs Cast LC 60 AR
Back up lining:
Höganäs Insul 1,5L
Lip ring
Alkali attack
Thermal shock
Corossion
Viking 330
Back up lining:
Porosil 23
Mortar

Foundry ladle

Ladles are used in foundryindustry to transfer molten metal from one location to another, generally from a melting furnace to a holding furnace. They are often used to hold metal while it is treated by degassing and/or fluxing. They are filled by tapping out a furnace or utilizing a metal transfer pump. Most transfer ladles require supporting steel shells and are lined with refractory, which can be a precast shape or cast in place. Due to extreme conditions in which the refractory is subjected, it must be resistant to thermal shock, cracks and erosion.

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Our solutions are listed on the tables below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Side walls

Erosion
Thermal shock
Alkali attack
Alex
Back up lining:
Porosil GII
VIP 12 HS
Bottom part
Erosion
Thermal shock
Alkali attack
Alex
Back up lining:
Porosil GII
VIP 12 HS
Tube
Erosion
Thermal shock
Höganäs Cast LC 801

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Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Side walls

Alkali attack
Alex
Back up lining:
Viking 330
Porosil 23
VIP 12 HS
Bottom part
Alkali attack
Alex
Back up lining:
Viking 330
Porosil 23
VIP 12 HS

Transfer ladle

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Our solutions are listed on the table below.

Area / Temperature (°C) Processing Conditions Solution (Standard Conditions)
Upper part

Erosion
Thermal shock
Höganäs Flow LC 70
Side wallsErosion
Thermal shock
Victor HWM
Back up lining:
Viking 330
Bottom partErosion
Thermal shock
Victor HWM
Höganäs Flow LC 70
Back up lining:
Viking 330

For more information about our refractory solutions for steel industry, please contact us.