What is the Effect of Adding Steel Fiber to Different Castables

Adding steel fiber to the refractory castable can enhance the toughness of the castable. Moreover, it can enhance the wear degree and mechanical impact of the castable, and more importantly, improve the thermal shock stability of the castable.

steel fiber refractory castable

The critical point of adding steel fiber to the castable is at 1350℃. If it exceeds 1350°C, the steel fiber will not play its due role. Like some castables used at positions exceeding 1400°C, there is no need to add steel fiber. No matter how much it is added, it will not have any effect, but it will increase the cost of the castable.

Like cement rotary kiln, white ash rotary kiln, pellet rotary kiln front and rear kiln mouths can use steel fiber-added refractory castables, because the front and rear kiln mouths have many castings, it is impossible to use refractory bricks for masonry, use steel fiber-added refractory pouring The material is not only resistant to tension and compression, but also resistant to fatigue and abrasion.

Not only steel fibers are added to refractory castables, but also appropriate amounts of steel fibers can be added to plastics and ramming materials to improve cracking resistance and peeling resistance. And in the curing process, adding steel fiber can prevent the linear shrinkage of the castable.

However, the amount of steel fiber added should not be too large, which will cause internal changes in the castable. After the castable is sintered at a high temperature, the expansion coefficient will increase and the thermal conductivity will also increase. Especially during construction, excessive addition of steel fiber will cause unnecessary troubles for construction.

There are many kinds of refractory castables with steel fiber, and there are many grades, such as high aluminum and steel fiber, corundum and steel fiber, mullite and steel fiber, and silicon carbide steel fiber. Compound refractory castable. It’s just that different proportions are added under different circumstances.

However, the amount of addition is a technical field, but if the temperature exceeds 1350 ℃, do not add steel fiber, not only does not work. On the contrary, the increase in cost also adds inconvenience to the construction.

Causes of Damage to Blast Furnace Hot Blast stove

The main reasons for the damage of the hot blast furnace include:

  • The masonry quality is not ideal, and the construction and acceptance are not carried out according to the masonry specifications;
  • The quality of the high-strength refractory fire castable in the hot blast pipe and the combustion pipe area is defective, which causes the upper brick to fall off The lining falls off;
  • The hot blast stove is changed frequently, which causes a certain degree of damage to the brick lining;
  • The operation of the furnace is not standardized, resulting in low-frequency pulsation of gas combustion, forming gas surge combustion, as the combustion capacity increases
  • Structural cracks occur when the hot blast stove cools down;
  • The arch roof combustion temperature exceeds the prescribed standard, and the arch roof fire brick lining is exposed to thermal stress and causes denudation;
  • The hot blast stove oven does not strictly follow The curve is controlled, and the oven effect is not ideal, which affects the life of the hot blast stove;
  • The daily operation and maintenance of the hot blast stove is not in place, and effective maintenance and repair measures are not taken for the hot blast stove and local redness;
  • The hot blast stove The failure of the monitoring devices and interlocking facilities of the company led to errors in post operation;
blast furnace
hot blast furnace

The quality of the tooling equipment and refractory materials required for the hot blast stove was low in the selection and selection of the hot blast stove, which affected the service life of the hot blast stove.

In order to prevent the corrosion of the furnace shell steel plate, acid-resistant paint is selected to protect the hot blast stove vault steel plate in the design. Among them, it is the key to choose a reasonable acid-resistant coating suitable for the use conditions of the hot blast stove. Monitoring method: In the past, two methods were mainly used to detect the temperature of the vault of the hot blast stove. One is to use platinum rhodium-platinum thermocouple to detect the vault temperature of the hot blast stove, which is a contact temperature measurement method, which has the advantage of high accuracy, but there are several defects:

  • The reaction speed is slow, mainly because of the poor performance of the protection tube
  • Inconvenient installation and operation of thermocouples;

(3) Short working life, there is a large amount of CO gas in the vault of hot blast stove, and CO is reducible, and it is very easy to corrode the thermocouple, which increases the maintenance cost in the later period. The other is to use a single-band infrared optical fiber to detect the temperature of the vault of the hot blast stove, which is a non-contact temperature measurement method, that is, the temperature is detected by measuring the infrared radiation emitted by the measured object through a temperature probe.

Features of Lightweight Insulated Castable

Lightweight insulation castable is the lower volume density of the castable, the basic volume density of about 1.5. The castable has many pores. Low volume density, small thermal conductivity, good insulation effect and other advantages. It is made of aluminate cement, high aluminum fine material, ceramsite, and additives.

 

Lightweight insulation castable price

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    The lightweight insulation castable good workability, strong adhesion. Strong anti- permeability, no acidizing treatment is needed, which is beneficial to ensure the compactness and fullness of the mortar seam of masonry, and can significantly improve the air tightness, integrity and anti-corrosion ability of the chimney lining.It is an ideal cementing material for lining of high chimney, high temperature flue and air duct.

    This series of refractory castables has the following features:

    1. The heat preservation castable volume light, high compressive strength, acid and acid gas corrosion resistance, heat insulation, heat preservation, low water absorption.
    2. It many air holes, low volume density, small thermal conductivity, good insulation effect.
    3. Good workability, strong adhesion, long initial setting time and operation time.
    4. The strength of lightweight insulation castable increases fast, the impermeability is strong, can significantly improve the lining of air tightness, integrity and corrosion resistance.

     

    Lightweight insulation castable manufacturer

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      The castable is widely used in electric power, petrochemical, metallurgy, kiln and other industries, and can also be used in non-ferrous metallurgy and other industries acid-proof pool and other acid-proof projects.

      We are a professional light insulation castable manufacturer, in the production and construction of the professional technical team, rich experience, service in place, welcome to buy the needs of friends, contact us at any time.

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        Advantages Of Monolithic Refractory

        Monolithic refractory has many different varieties according to their construction type. These products have their own characteristics and advantages. Generally speaking, The production of monolithic refractory materials is only through the preparation of granules, powder materials and the mixing process of the mixture. Monolithic refractory material has the advantages of simple production process, short production cycle, low heat energy consumption, good integrity in use, strong adaptability and good comprehensive use effect. If you are in need of them, please feel free Contact Us For Free Quote!

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          What Is Monolithic Refractory

          Monolithic refractory is the name normally given to all unshaped refractory products, the word monolithic coming from the word monolith meaning “big stone”. Unshaped refractory materials have different states such as wet, semi-wet, or dry, and can be directly used to construct or repair industrial furnace linings.

          Unlike the fired-shaped refractory products, the construction of the lining body with such materials can form a seamless joint inner lining, so it is also called jointless refractory material or monolithic refractory material in Europe and the United States.

          Because such materials are formulated and constructed in a similar manner to ordinary building concrete, they are also known as refractory concrete in Eastern Europe and Russia.

          Construction of Insulating Castable Refractory Lining
          Construction of Insulating Castable Refractory Lining
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          Cement Rotary Kiln Cooler Refractory Lining
          Cement Rotary Kiln Cooler Refractory Lining

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            Monolithic Refractory Advantages

            The use of monolithic refractory materials is more advantageous than brick masonry in different types of furnaces. Major advantages of monolithic refractory are as follows:

            Simple preparation process, short production cycle and high labor productivity

            • Strong Adaptability. Monolithic refractory can be made into any shape without being restricted by the shape of industrial furnace structure.
            • Good integrity, good air tightness, large thermal resistance, can reduce heat loss and energy saving in industrial furnaces.

            Easy to mechanize construction, save labor and time.

            • For damaged industrial furnace linings, it is easy to repair with unshaped refractory materials, which can prolong the service life of lining and reduce refractory consumption.

            Therefore, many fired refractory products have been gradually replaced by monolithic refractory material, and the proportion of unshaped refractory material used in the metallurgical industry has accounted for 45% – 70% of the total refractory material usage.

            So if you are looking for high quality monolithic refractory, there is no doubt that RS will be your best choice! Just Contact Us For Free Quote!

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