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
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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
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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
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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
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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
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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
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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.
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Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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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
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The performance advantages of high alumina refractory castables

The prefabricated furnacecover adopts assembly process, so the installation is convenient and rapid;
At the same time, due to the use of casting molding powder, the unsafe factors such as peeling off pieces or falling fire bricks are eliminated, and the installation period of the furnace cover can be significantly shortened and the production cost can be reduced.
However, high-aluminum refractory castable prefabricated furnace cover is superior to the high-aluminum brick cover, the key is the length of the thermal insulation performance.
Since the percentage of raw material quota for high-aluminum bricks has been standardized, once the kiln is fired, its physical performance parameters have been determined. Therefore,the high-aluminum brick can be considered unchangeable. The precast block casting material is mainly made of high-aluminum raw materials, and MgO, Cr2O3, ZrO2, etc. are added at the same time. The parameters such as thermal conductivity, thermal expansion coefficient and elastic modulus of the casting material can be changed with the percentage of each component, which indicates the prefabricated furnace cover is controllable.

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Introduction of dolomite bricks

The dolomite bricks, is a kind of magnesial refractory material with periclase as principal crystalline phase and tricalcium silicate as secondary phase. It contains 80 % ~ 87% MgO, 6 % ~ 9% CaO, CaO/SiO2 ratio is between 2.2 ~ 3.0. Its significant structural feature is periclase directly contact with dicalcium silicate and tricalcium silicate, making eutectic solution-4 Cao-Al2O3-Fe2O3 fill into crystal gap between dicalcium silicate and tricalcium silicate. Its porosity is low, the refractoriness under load is higher than 1700 ℃. It has good alkaline slag resistance ability, but with poor thermal shock resistance.

Made by calcium magnesia sand as refractory raw material, it will be made by firing at 1550~1600 ℃ after crushing, burdening, mixing and molding. It will be used at eye place of side-blown converter, top place of open-hearth furnace and oxygen-blown converter etc.

Magnesia-calcium brick has seven properties: High temperature resistance, slag resistance, spalling resistance, wear resistance, purifying molten steel and hydration resistance performance.

With the increasing production of stainless steel and all kinds of clean steel products, the demand of various magnesia calcium brick are increasing accordingly. For better production and using correctly, detailed understanding and learning of working performance and influencing factors of dolomite bricks are very necessary.
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:Dolomite
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The advantages of Magnesia Carbon Brick

Changxing Refractory is able to manufacture magnesia carbon brick for every ladle, EAF, and BOF. We will design you a well-balanced lining, providing optimal performance at the lowest possible cost. Our magnesia-carbon brick is made from more than 98% electrically fused magnesite, high purity graphite and metallic antioxidants as needed. Size and specification can be tailored according to furnace type.

Changxing Refractory’s magnesia carbon brick factory is located in the magnesium capital of China, and products with high bulk density and low porosity.

Magnesia carbon brick series used for the electric furnace are made by adoption of fused magnetite, high-purity magnesium sand and graphite as principal raw material, through high-pressure molding and low-temperature treatment. This product is mainly used for electric furnace lining, which enjoys advantages including high temperature resistance strength, corrosion and spalling resistance. According to the smelting conditions and the kind of smelting steel, different brands magnesia carbon bricks are available.

Magnesia-carbon bricks are resin bonded bricks containing high-purity fused and or sintered magnesia and flake graphite as their main ingredients.

Advantages:

Magnesia carbon brick has excellent corrosion resistance together with good thermal shock properties.
Magnesia carbon brick offers good oxidation resistance due to use of high purity flake graphite.

Application:

Magnesia carbon brick is widely used in Electric Arc Furnace sidewalls, converters, hotspots and coldspots, and ladle furnace slag lines.
Specific Application:The lining and tap hole of Steelmaking Convertor, the sidewall and slag line of High Power Electric Arc Furnace and ladle slag line.
Article Source:Magnesia Carbon Brick
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Common problems that arise during the use of ladle

(1) It is often encountered to replace the ladle caused by argon blowing. Replacing the ladle will not only delay the smelting time, but also the process of replacing the ladle will bring safety problems, and it will cause the molten steel to take in air and bring in some inclusions during the process of changing the ladle. Inclusions increase the difficulty of smelting and increase the cost of smelting.

(2) The slag line is seriously eroded, and the slag line usage rate is low. Frequent replacement of the slag line will increase smelting costs, and it is also not conducive to the normal operation of smelting, prone to leakage of molten steel, which brings certain hidden dangers to production.

(3)The ladle brick is short in service life and needs to be replaced frequently.

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:Common problems that arise during the use of ladle
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Ways to improve the life of RH furnace lining

1.Different steel grades, such as ultra-low carbon steel and low carbon steel, have different refining processes and conditions, and the requirements for refractory materials of furnace lining are also different. It is recommended that steel mills concentrate different steel grades in different furnaces in order to select the appropriate refractory material according to the refined steel grade.

2.The corrosion mechanism of different parts of the RH furnace is different. Therefore, the appropriate refractory raw material should be selected according to the specific conditions of different parts during refining, and the integrated furnace should be carried out.

3.Control the refining temperature, do not exceed 1650 °C.

4.Improve the use efficiency of the RH refining furnace, increase the daily refining furnace times, shorten the intermittent time, and adopt insulation measures during the interval to reduce the temperature fluctuation in the furnace.
5.Monitor the erosion of the dip tube and perform spray repair during the rest period between the two furnaces. Increasing the life of the dip tube and reducing the number of times the dip tube is replaced can reduce the structural spalling caused by the large temperature fluctuation in the lower part of the vacuum chamber.
6.When replacing the dip tube, the lower part of the vacuum chamber, the bottom of the furnace, the throat and other parts can be sprayed and repaired immediately, or the ramming material can be filled in the throat to be repaired.
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.
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Matters need attention for the sintering of tundish lining

To save cost and make it easy to use, it’s better to make a fast sintering to increase the temperature in tundish to 1000-1100℃ 1 to 2 hours before it is put into use.
For slab continuous casting, normally Al-C monoblock stopper or integrated Al-C submerged entry nozzle would apply with tundish. If the sintering is too long, the strength of monoblock stopper and SEN will be lowered, if they are with bad anti oxidizing coatings, they could be oxidized, which will further lower their strength and service life.

The changing rules of the strength of aluminium carbon products during sintering is: With the increasing of sintering temperature, the strength goes down, when the temperture is between 500℃ to 600℃, it has the lowest strength. When the temperature goes up again, the strength will go up, when the temperature is 1300℃, it will go back to original level, but when the temperature rise again, the strength will go down. For this reason, it is required that the sintering should be fast to get the preset temperature asap.

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:Matters need attention for the sintering of tundish lining
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Delelopment of continues casting & tundish

CCM first appear in 1950s, it is characterized by fast casting and focus investment. CCM technology was developing in a very fast speed. In Year 1970, CCM only took 5.6% all over the world, while the data reached 62.4% in Year 1990, and in some developed countries, it was even 95%. In recent years, many steel plants adapted CCM instead of mould casting. Until Year 1994, in total 24 countries are of full CCM now.

Compared with traditional mould casting, CCM can improve metal recycle rate and low down power consumption. CCM can 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,

1.Diversion. For multi-strand CCM machine, the melten steel would be divided from tundish.

2.Continues casting. When multi-furnace continuous casting, tundish can be a holder when changing ladle.

3.Lowing down presure.

4.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：Delelopment of continues casting & tundish
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Application of MgO-C bricks in ladle

Currently, inhibition of steel temperature droping has become a major issue for many steel plants. Therefore, in order to suppress temperature drop of molten steel, there has a test to study insulation problem of refractory lining in 185t ladle, by comparing three different measures.

First: Reducing the heat transfer effect of sidewall castables (30% reduction). This method is by reducing coarse particles in refractory castable, increasing porosity and other measures to reduce the thermal conductivity, to suppress heat dissipation.

Second: Using insulation materials in the backlayer of wall castable. This method is to use one layer insulating bricks with less than 1W (m℃) thermal conductivity between ladle steel shell and wall castable, to inhibit heat dissipationheat.

Thrid: Reducing the heat transfer of slag line MgO-C brick heat transfer (30% reduction). This method is developed in recent years, to select lower thermal conductivity of MgO-C brick from the high thermal conductivity of magnesia carbon brick for slag line, to suppress heat dissipation.

After comparing, the results found that: only in reducing the thermal conductivity of slag line magnesia carbon bricks , the effect of suppressing steel temperature dropping is significant, up to 2℃. The durability is same or higher than ordinary ladle, less cracks, the residual condition after use is also very good.

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：Application of MgO-C bricks in ladle
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Influence of Refractory Materials for Ladle Leaking

Slide gate refractory part is a central part of the slide gate, is a key component in direct contact with the control of molten steel, its physical and chemical properties is a key factor in determining whether the normal use of the sliding gate.
1.Ladle well block is of low hot crushing strength. When using air pick to chance upper nozzle well block, the well block would be easy to breakdown. The inner diameter would get larger, and gap between well block and upper nozzle may get bigger. The molten steel would easy to get into the gaps, and leak would easy to happen.
2.Ladle well block is of weak thermal resistance. During working period, like casting and hot repair, the temperature difference would be very big, and the well block would easy to break down. If can not be found in time, molten steel would leak through the gap between upper nozzles well block and nozzle.
3.Ladle sliding gate plate is of weak erosion resistance. When doing half hole casting, the lower plate would bear higher erosion strength, and easy to appear groove. After closed the plate, molten steel would leave in the groove and get cold there, in which way the two plates can not work smoothly.
4.If the low sliding gate plate break down, gap would easy to appear when casting, and molten steel would leave through it. If terrible, the sliding gate plate would easy to break into pieces because of molten steel pressure.

5.Sliding gate plate mortar can not bear erosion well, in which way gaps would appear and cause leak. If can not be found in time, this would cause leak between upper nozzle well block and well block, upper nozzle and upper sliding gate plate.
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.
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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 plates. 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 ladle 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, ladle 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
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Key technology of smelting stainless steel in combined blowing converter

Hot metal dephosphorization technology. When the hot-smelting converter uses molten iron to smelt stainless steel, the dephosphorization of the molten iron is first carried out, or the dephosphorization is carried out by a mixed iron car, or the dephosphorization is carried out in a double-blown converter.
Converter thermal compensation technology. Since stainless steel is a high-alloy steel, it is necessary to add a large amount of cold alloy during smelting. For example, only the sensible heat and oxidation heat of molten iron are used to make steel in the converter, and the heat energy is obviously insufficient. According to the calculation, the heat shortage of the stainless steel SCTS304, SC1S316, SC1S410, SC1S420 and SUS430 in the whole molten iron condition is about 11.5%, 14.6%, 6.1%, 8.0% and 5.4%, respectively, for which the development cost is low. Technology is an indispensable technology for smelting stainless steel in a combined blown converter. Nowadays, the thermal compensation technology of the secondary combustion (called PC gun) of the top of the furnace and the broken coke block (granule) and the double-flow oxygen lance are generally used.

Thermal compensation technology for crushing coke blocks (grain) on the top of the furnace: The thermal compensation technology using broken coke particles as a heat source has the following advantages over the method using FeSi as a heat source:

a. The remaining coke blocks (granules) remaining in the steel plant can be used, and the source is wide and the price is cheap;
b. Even if used in large quantities, the amount of slag increases a lot;
c. The generated CO gas can be effectively utilized as a heat source.
Thermal compensation through secondary combustion: The secondary combustion thermal compensation technology of the dual-flow oxygen lance can tap the potential of chemical heat in the furnace, thereby reducing the amount of coke thermal compensation, thereby shortening the blowing time and oxygen consumption.

The use of a dual-flow oxygen lance increases the secondary combustion rate of CO.
The secondary combustion rate is increased by controlling the ratio of the oxygen amount of the main and auxiliary oxygen holes. The secondary combustion rate is the highest when the ratio of the secondary pore oxygen to the main pore oxygen is 20%. In addition, increasing the height of the lance is also beneficial to increase the secondary combustion rate.

Since the main alloy of stainless steel, the inscription element, is easily oxidized at high temperatures, it is necessary to have sufficient decarburization capability in the converter to smelt stainless steel, and also to suppress the oxidation loss of chromium.

According to the principle of metallurgy, the higher the temperature of molten steel, the better the decarburization reaction; the lower the partial pressure of CO in the converter is beneficial to the reduction of chromium, and the oxidation loss of chromium can be suppressed while blowing oxygen decarburization. In order to meet the requirements of thermodynamic theory, the converter is usually diluted or refined to dilute the concentration of CO generated in the converter due to the decarburization reaction with a large flow of bottom-blown inert gas to reduce the partial pressure of CO. At the same time, it can also promote the stirring of molten steel and accelerate the decarburization reaction. In addition, in the control of molten steel temperature, we must first overcome the problem of insufficient heat source, and then effectively achieve high temperature (≥1700 °C) operation.
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:Key technology of smelting stainless steel in combined blowing converter
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Development of ladle lining refractory materials

20th Century 50--70 years, China's steel plants mainly used aluminosilicate refractory materials, including clay, high alumina brick and so on. Since the 1980s, China has successively developed the aluminum-magnesium carbon, coal quality calcium and magnesium and other several series of new steel package refractories. Wherein the aluminum-magnesium carbon refractory materials are of varieties, all specifications, is China's major ladle refractories.

In earliest 20th Century 50--60 years, a variety of clay bricks were mainly used in our country. Due to low cost, until the 1980s, some steel plants were using clay bricks as ladle lining material. Although clay bricks is no longer used as ladle material so far, it had made a great countribution for recovery and future development of China's steel industry in the early days.

With the continuous development of steelmaking technology, steel quatity and quantity, clay bricks was no longer used because of short service life. Some of our mills started using a variety of high alumina bricks as ladle lining material, in which way the ladle life got a greatly improvement.

With the continuous improvement of steelmaking technology, high aluminum ramming mass, wax brick, alumina magnesia, aluminum-magnesium casting material, aluminum-magnesium unfired brick, aluminum-magnesium spinel castable, aluminum MgO-C, magnesium aluminate spinel brick, aluminum-magnesium unfired brick and a series of high-grade refractory materials appeared to adapt to higher demand.

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:Development of ladle lining refractory materials
Company name:?Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The importance of refractory design effect for submerged arc furnace’s working performance

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 furnace lining and furnace shell.

The premature failure of the refractory 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 furnace lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

If you want to learn more about this, please contact us. 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: Intermediate Frequency Induction Furnace Lining Material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The importance of refractory design effect for submerged arc furnace’s working performance

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 furnace lining and furnace shell.

The premature failure of the refractory 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 furnace lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

If you want to learn more about this, please contact us. 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: Intermediate Frequency Induction Furnace Lining Material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

High alumina brick and alkali brick

High alumina brick
High alumina brick has high compressive strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better.

High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) alumina brick and general alumina brick and so on.

Alkali Brick Series
Alkali brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidly forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.

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:High alumina brick and alkali brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Precautions for medium frequency furnace charge

Firstly,Ultra-high-strength lightweight ramming mass should be mechanically stirred when mixing, and forced concrete mixing should be used. Mixers, upper hoppers, weighing containers, etc. should be cleaned. The mixing time and the amount of liquid to be added shall be strictly in accordance with the instructions for the construction of the medium-frequency furnace neutral refractory material in the medium-frequency furnace.

Second, the mechanical equipment should be installed firmly, and the distance between the mechanical equipment and the pouring place should be as short as possible. Mechanical equipment should be used after inspection and adjustment.

Thirdly, Ultra-high-strength lightweight ramming mass must be measured according to the mixing ratio. The scales, measuring cups and measuring cylinders used must be verified by calculation. The various appliances used in the various construction stages of the ramming mass must be in good condition and kept clean.

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:Precautions for medium frequency furnace charge
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Performance advantages of corundum castables prefabricated parts

1) Advanced: The bottom of the ladle is lined with corundum spinel prefabricated bricks, which has a significantly improved performance compared with the traditional alumina magnesia carbon bricks, and solves the problem of low life of traditional alumina magnesia carbon bricks under LF refining conditions;

2) Comprehensive masonry realizes long life and economy of ladle: Since the refining of ladle is LF, it is necessary to ensure synchronization with the long life of the slag line. It also reduces the loss of refractory raw materials, taking into account the long life and economy of the ladle;

3) Small pollution to molten steel: The refractory material used is excellent in scour resistance and erosion resistance, and the amount of refractory material entering the molten steel per furnace is small, and the pollution to molten steel is small;

4) High construction flexibility and effective control of working time; high thermal intensity.

The corundum castable prefabricated parts are characterized by high-temperature strength, which is greatly improved compared with the previous precasts.
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:Performance advantages of corundum castables prefabricated parts
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/