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Sliding gate damage theory and meaning of conjunction

Ladle slide gate plate mainly contains two types, alumina carbon and alumina zirconium carbon. With steel production increasing and steel quality improving, calcium treatment process is applied, therefore, calcium content in the melton steel increased. Using alumina carbon and alumina zirconium carbon slide gate plate when casting steel, SiO2 and Al2O3 in the slide gate plate would mixed with [Ca], [CaO] in the melton steel or slag and get into low-melting point materials and feldspar, which would cause damage of slide gate plate. This type low-melting point materials would be easy to crushed down by erosion, new low-melting point material would re-appear. This progress would cause the erosion heavier, in which way the slide gate plate would be damaged gradually. Conjunction of slide gate plate can reduce the number of turnover ladle, low down ladle serves and turnover pressure. In addition, slide gate plate conjunction can low down labor working, improve ladle lining temperature, thus low down casting temperature and bring a number of benefit for production and reducing cost. 

From Year 2008, our factory succeed to develop double conjunction and from Year 2010, triple conjunction is developed. With the triple slide got into the normal production, on-site production, reduce labor intensity, the effect of reducing the cost of generation is very obvious.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Sliding gate damage theory and meaning of conjunction Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Silica ramming mass lining for tundish

Because of low investment, induction furnace is still very popular in worldwhile. Out of power, financial and other elements limit, many steel plants can not do continues casting. In this way, the tundish can only do sequential for 2 or 3 heats, or even 1 heat. In this condition, many factories are using tundish board, which should be broken down after one casting. Say for one 2-strands tundish, cost for one set tundish board would be 20-25 USD. One casting service life would be a very big cost, and also bring a heavy labor work. To sort out this problem, many of Chinese small factories choose to use silica ramming mass to do tundish lining. After every casting, they would operate as following:

Pure out all melton steel.

Blow the tundish nozzle with oxygen lance.

Clean slag inside the tundish.

Cool down the tundish in normal temperature.

Change the sizing nozzle.

Preheat the sizing nozzle and start to use the tundish again.

In this way, we should only change the tundish nozzle every casting. For the silica ramming mass lining, it would last at least 10 castings, which would save a big cost from using tundish board. For further details, please feel free to contact us, we would be your reliable partner.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Silica ramming mass lining for tundish Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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EAF working layer refractory materials

EAF is widely used for nowever days steel making industries. For this?furnace, the key point effecting service life is working layer. Working layer would touch with melton steel directly, where is of high thermal load, heavy chemical mechanical erosion. So high quality refractory materials should be adapted in working layer.

Regular lining method for EAF working layer is namely sintering, vibrating and brick-construction. For brick-construction method, asphalt binder magnesia brick is widely used. For sintering and vibrating method, magnesia sand with tar as bonding agent are normally used. In nowever days, brick-construction and sintering method are gradually eliminated because of low service life and less applicability. For high power EAF, dry magnesia vibration mix is widely used. After powerful ramming and the density requirement, the mix can be sintered into overall under certain temperature, and a good service life can appear. In regular condition, service life of vibration mix can reach 300 heats. After one time hot-repairing, the service life can be as long as 500-600 heats. With this method, furnace stopping time would decrease, and steel unit cost would also low down by a large degree, then the steel plant profit would increase a lot.

Article Source:dry magnesia vibration mix Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Functions of mono-block stopper

Mono-block stopper is mainly used for the tundish, which performs a switching function. The steel flow is controlled by the position of the head of mono-block stopper to tundish.

Meantime, the argon hole can be blown through the argon hole of the integral plug to prevent the nozzle from being clogged. There are several advantages by using the mono-block stopper: 1. Safer. 2. Reduce the nozzle blockage accident. 3. After the argon is blown by the stopper rod, the total amount of inclusions in the slab is greatly reduced, and the quality of the slab is improved. 4. As the accident rate decreases, the output of continuous casting machines is relatively increased.

Article Source:Mono-block stopper Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Reasons of ladle slide plate crack

Firstly, when the molten steel flows through the casting hole, the temperature suddenly rises, and radioactive thermal vibration cracks are generated around the casting hole. Secondly, the cast hole is first subjected to thermal shock and expansion. The change in position is slightly smaller. When the thermal conductivity is small and the temperature gradient is large, a large thermal stress is generated at a certain distance from the casting hole of the sliding plate to cause cracks. Thirdly, ladle slide plate is a non-homogeneous material, especially a composite ladle slide plate. It is easy to cause cracks due to different expansion coefficients. At last, mechanical constraints. The slide is heated by the heat, if there is no gap or gap between the two ends of the sliding box and the slide, it will be restricted by the side wall of the sliding box when the board expands. And the sliding plate is a brittle material, and excess crushing strength leads to crack.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source: ladle slide plate Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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The application of chromite sand

Chromite ore fines has good increasing friction effect in low and high temperature, plays a dual role too. Added to rubber can play a good role of increasing friction, and do not scratch the duality and noise. In the friction material commonly used in chromite fines Cr203, content of 25%-40%, the higher Cr203 content, increasing friction effect is bigger. Use should pay attention to controlling the amount and particle size. Proper dosage should not exceed 7%, particle fineness more than 200 projects. Excessive dosage and coarse grain size can improve the friction coefficient but also will cause friction increases obviously.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:The application of chromite sand Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Introduction of continuous casting technology

Continuous casting technology is characterized by fast casting and focus investment, which was developing in a very fast speed from 1970s. At the first beginning, continuous casting only took 5.6% all over the world, while the data reached to 64.4% in the end of 21st century. And in some of the developed countries, it was even above 96%. In recent years, many steel plants adapted continuous casting technology instead of mould casting. To compare with the traditional mould casting, continuous casting can improve metal recycle rate and low down power consumption. It can also make the melting work simple and short the melting time, in which way the production efficiency can improve in a large degree. Tundish is a middle progress of steel making, and it is the kep point which can decide continues casting or not. Furthermore, tundish would have a big effect on melten steel quantity and quality. Its functions are as following: A.Diversion. For multi-strand continuous casting machine, the melten steel would be divided from tundish. B.Continues casting. When multi-furnace continuous casting, tundish can be a holder when changing ladle. C.Lowing down the presure. D.Protecting melten steel quality. Through using covering agent, long nozzle and other protecting device, tundish can help to protect the melten steel quality.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Introduction of continuous casting technology Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Construction procedures for refractory brick masonry

(1) Construction procedure of dynamic furnace 1. Dynamic furnace kiln masonry must be carried out after the single-machine no-load test operation of the kiln is qualified. 2. The basic procedures for masonry are: The starting point should be selected from the hot end to the cold end or from the low end to the high end. The working point should be cleaned and lined to select fire bricks. According to the hot and cold section, different materials of refractory fire bricks should be used. If the qualified bricks are used, there are anchor bolts or bricks. The board, that is, the welding of the anchor nail or the brick board, if there is a heat insulation layer (such as calcium silicate board, etc.), it is necessary to first prepare and install the heat insulation layer, and the mortar mud should match the refractory brick to build the brick expansion gap. Reserved and filled.

(2) Construction procedures for static kiln The starting point is selected (generally from bottom to top, from the hot end to the cold end). The line is drawn (usually based on the lowest end of the tuyere or inspection port). Fire bricks are selected according to different parts of the equipment. According to the drawings, if the anchoring nails and the supporting bricks are welded, if there is a thermal insulation layer, the installation of the insulating layer should be prepared and used. The material of the mortar should be matched with the refractory bricks to build the arch and lock the bricks , remove the reserve and filling of the expansion joint of the arch tire.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source: Construction procedures for refractory brick masonry Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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The importance of refractory design

Refractory design remains the most fundamental factor in furnace construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining. The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory lining and furnace shell. The premature failure of the furnace lining will lead to extensive heat losses, furnace bath shift, change in taphole orientation and alteration of the Pitch Circle Diameter. In this way, the pre-design of refractory lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

Article Source:The importance of refractory design Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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The application of converter tapping hole

The tapping hole of the converter is the channel through which the molten steel flows from the converter to the ladle. It is one of the key refractory components of the converter. Tapping the tapping process to achieve the steel slag separation process to reduce the flow of molten steel into the ladle caused by steel pollution, also reduces the burning of alloying elements. At the same time, the steel flow at the tapping hole strongly agitates the ladle molten steel and promotes the slagfloating and the deoxidation products to float up, which not only affects the production efficiency of the molten steel smelting but also the quality of the molten steel.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:The application of converter tapping hole Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Factors Affecting Refractory Materials for Electric Furnace Cover

1.Arc radiation When the electric furnace is smelted, the arc temperature generated by the discharge of the electrode is as high as 3000 ° C or more, and the small furnace cover working face is subjected to severe melting loss. 2.Thermal shock The arc heating, tapping and the rotation of the furnace cover to the outside of the furnace cause quenching and rapid heat, which causes the furnace cover to generate thermal stress and cause the working surface to peel off. 3. Chemical attack The molten steel and slag are sprayed onto the working surface of the furnace cover, and some of the chemical components chemically react with the working surface and penetrate into the working surface to form a metamorphic layer. 4. Electrode spray water The use of spray water on the electrode not only reduces the electrode consumption, but also causes the temperature around the electrode hole to decrease, thereby suppressing the high temperature melt loss to some extent. If this measure is not used, the electrode hole damage will be aggravated, mainly as reaming.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source : Factors Affecting Refractory Materials for Electric Furnace Cover Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Refractory Materials for Electric Arc Furnace Working Layer

For electric arc furnace, the key point effecting service life is working layer. Working layer would touch with melton steel directly, where is of high thermal load, heavy chemical mechanical erosion. So high quality refractory materials should be adapted in working layer.

Regular lining method for EAF working layer is namely sintering, vibrating and brick-construction. For brick-construction method, asphalt binder magnesia brick is widely used. For sintering and vibrating method, magnesia sand with tar as bonding agent are normally used. In nowever days, brick-construction and sintering method are gradually eliminated because of low service life and less applicability. For high power EAF, dry magnesia vibration mix is widely used. After powerful ramming and the density requirement, the mix can be sintered into overall under certain temperature, and a good service life can appear. In regular condition, service life of dry vibration mix can reach 300 heats. After one time hot-repairing, the service life can be as long as 500-600 heats. With this method, furnace stopping time would decrease, and steel unit cost would also low down by a large degree, then the steel plant profit would increase a lot.

Article Source：Refractory materials for electric arc furnace working layer Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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The refractories trend for EAF cover

Electric furnace cover with refractory material development trend is: brick - prefabricated block - the overall pouring. 

For alkaline fire brick cover, electric tile with magnets. In order to ensure the stability of the furnace cover structure and reduce the deformation and peeling of magnesia, the use of iron plaster or masonry insert iron. As the metal induced current (especially high power electric furnace cover), the formation of local overheating to non-magnetic steel fire brick, on the other hand pure magnesia brick linear expansion coefficient is too large, the amount of small. In addition, the whole pouring the cover. The use of the overall casting furnace cover to promote the life of the furnace to further improve. After the water is cooled, the electrode is also water-cooled around the electrode, and the high-alumina ultra-low cement castable containing 3% Cr2O3 is added from the material and the stainless steel fiber is added. The furnace cover is used in the case of slightly repaired 594 furnace and service life is 4 times than before.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source：The refractories trend for EAF cover Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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How to choose insulating bricks

Insulating bricks used in thermal equipment can greatly reduce heat loss and furnace weight and increase thermal efficiency and labor productivity.

For most thermal equipment, to save energy and improve working conditions, insulation is necessary. However, insulation for certain equipment is not necessary because of the advantages and disadvantages of insulation. Therefore, in the actual situation and the performance of the insulation brick should be considered when selecting suitable insulation bricks.

The principles for selecting insulation bricks include: 1.It should not affect the service life of the entire refractory masonry; 2.For high-temperature furnaces that work continuously, general large-area insulation is reasonable and can reduce heat loss. However, for some special areas, such as open hearth roofs, insulation can reduce the service life. For periodic working furnaces, regenerative heat loss is a major factor in heat loss. Insulation can increase the temperature of the masonry and increase the heat of regeneration. Therefore, it is determined whether the regular working furnace should be insulated after calculating the heat storage and heat loss. 3.Because insulating bricks have high porosity, they cannot withstand excessive loads and should not be in direct contact with molten metal, slag and high temperature dust. 4.Insulation bricks have low strength. Brick joints and expansion joints should be properly disposed to avoid damage due to volume expansion. Insulating refractory fire bricks should not be subject to strong mechanical vibration, shock and friction; 5.Since the insulating brick has a large reheat linear contraction, the maximum working temperature should be less than 100℃?than the firing temperature.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:How to choose insulating bricks Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Function of Refining Slag

In order to take with the problem of serious erosion of ladle lining during the desulfrization of LF refining, LF refining slag is adjusted and calcium aluminate system substituted fluorine free refining slag with fluorine. After the adjustment of the slag, the erosion conditions on ladle were improved greatly and refining number, refining ratio and remaining lining thickness after demolishing all increased substantially. The liquidity of new slag system and desulfrization effect could meet the production requirement.

Factors which would effect refractory to dissolve with slag contains as following,?chemical composition and properties of slag; slag refractory component saturation concentration and the actual concentration difference; the reaction product of slag with Refractories; viscosity of slag. For steel mill with refining ladle, especially on Wall slag line, the use of magnesium aluminum carbon brick building, MgO as the main oxides, it is classified as basic refractories. The higher the alkalinity of slag, its ability to dissolve erosion weaker; dissolution erosion rate of slag refractory drank proportional to the difference between the actual concentration of a slag refractory component Cs and the actual concentration Co. Cs-Co larger Refractories in slag dissolution rate will be. The slag viscosity increases, will reduce the rate of dissolution of refractory, refractory damage weakened.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Function of refining slag Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Construction of Converter Refractories

The converter is an upright cylindrical smelting furnace that does not require an external heating source and mainly uses liquid pig iron as a refractory raw material for steel making. According to the nature of the furnace lining refractory, it is divided into two types: acid converter and alkaline converter. According to the part of the gas blown into the furnace, it is divided into a bottom blowing, a top blowing, a side blowing and a top-bottom composite blowing converter. Bottom blowing, top and bottom composite blowing converter bottom design breathable fire bricks. When laying, you need to locate the position of the ventilation bricks. The bottom blowing and side blowing blowing furnace bottoms are not designed with ventilated bricks, and the bottom of the furnace is relatively simple. According to the bottom drawing of the converter, the production of magnesia carbon bricks for the bottom of the furnace is arranged, and each type of brick is used for production. The center brick of the bottom is processed bricks. According to the physical and chemical indicators of the design materials, the appropriate magnesia carbon bricks are selected for bonding processing. After processing, the cross reference line shall be drawn on the plane of the upper part of the center brick to provide a reference for positioning the ventilating bricks in the subsequent pre-laying and determining the position of the steel side and the steel side.

Breathable bricks need to be pre-made models. The model is generally made of wood. If the size is too small, it can be replaced by other refractory materials such as magnesia carbon brick. When processing ventilated bricks, special attention should be paid to technical indicators such as slightness, diagonal difference, and distortion. The dimensional deviation of the permeable brick directly affects the masonry of the steel mill. When making a ventilated brick mold, the dimensional tolerance should be controlled as a negative rule as much as possible. If it is a square rule, the steel factory may have a large gap around the ventilated brick.

In addition to the above refractory materials, it is also necessary to prepare sand at the bottom of the furnace (3mm-1mm), grinding tools, cutting machines, rubber hammers and other auxiliary materials.

Article Source:Construction of converter refractories Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/

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Some measures to improve the life of ladle slag line bricks

1. Optimize the refined slag system The light burned dolomite is added during the refining process to increase the MgO concentration in the slag, increase the alkalinity and viscosity of the slag, control the amount of slag under the converter, and reduce the FeO content in the slag. The alkalinity of the refining slag is controlled in the range of 4.2~5.0, and the FeO content in the slag is controlled at about 0.5%. At the same time, the viscosity of the slag is adjusted, and the MgO content in the slag is controlled at about 12%, which can effectively reduce the erosion of the slag on the magnesia carbon brick. 2. Improve slag brick material The higher the purity of magnesia used in magnesia carbon bricks, the less B2O3 in impurities, and the higher the corrosion resistance of lining bricks when the proportion of carbon to sulfur is high. The material of the slag-line magnesia carbon brick is improved, and the fused magnesia with high purity is used as the refrafctory raw material, and the carbon content is controlled at about 14%, which can effectively improve the corrosion resistance of the slag line. 3. Control the argon blowing system and the power supply system The LF furnace adopts an argon blowing mode combining intelligent argon blowing and manual control. By manually controlling the intermittent stirring of large argon gas, the heat transfer of the steel slag near the electrode is promoted, and the slag temperature is too high to cause destructive erosion of the magnesia carbon brick. The VD furnace uses a staged argon control mode. At the same time, the refining and energizing system is controlled. When the power is turned on, the high voltage and low current long arc operation is adopted. After the slag is formed, the low voltage and high current submerged arc operation is used.

Article Source:magnesia carbon bricks Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd Email: sales1@chinafirebrick.com Website:http://www.chinafirebrick.com/