The development of low creep high alumina brick

 Low creep high alumina brick is an acquainted product for refractory material and steel making workers. In 1985,in order to realize the nationalization of refractory material for Baosteel second-stage construction, metallurgy organization pay more attention to the research the low creep high alumina brick reaching the Japanese level.

Until now, many factories can produce the higher quality low creep alumina brick for the blast furnace and cowper stove. The burdening of the most of homebred low creep alumina brick is to add the family of sillimanite materials, whose process is complicated and cost is higher.

Early guidance Tangshan Iron and Steel author refractory plant for Bao steel to develop low creep high alumina brick, but with pure silica powder as a secondary mullitization provenance, products in 1550 ℃ 0.2 MPa 50 h creep rate index level over Japan. There was no disclosure of the technical know how to add quartz. In fact, this is a lesson to be learned from an article in the Russian data. A Ukrainian Institute refractory low creep high alumina brick submitted on paper entitled. High alumina refractories with high creep resistance at temperatures. At first glance, the title seems to be no novelty, but its high-performance products. The technology index of industrial scale produced by this share company :w(Al2O3)>73%, show porosity ≥18%,compression strength >100Pa, Heavy softening temperature (0.5MPa)> 1750 ℃, the creep rate (1600 ℃ 1.5MPa24h) <0.09%.Here note load softening temperature and pressure values creep rate tests.

Low creep high alumina brick is generally cannot afford such high stresses. The products used in the lower temperature hot stove brick dome, more than 9.5 years of continued operations. Speaker did not introduce technical points, did not explain the materials used, but no mention of the addition of quartz. But between the lines describe a little trace impurities in the raw material properties, the industry can determine its so-called "purity of 99% SiO2" is quartz, quartzite and general purity. In fact, the use of fused alumina, activated alumina, and a quartz-based raw materials to manufacture non-uniform state technical essentials multiphase quartz reaction product is so fully realized mullite bonded corundum microstructure to achieve excellent high temperature performance.

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Design and Application of Tapping Sleeve Brick

The tapping sleeve brick is the channel for the molten steel from converter to the ladle. It directly contacts with the molten steel and its life directly affects the steel making rhythm of the converter. From the structure, tapping sleeve bricks are divided into monolithic sleeve brick and split sleeve brick. The monolithic sleeve brick is generally used isostatic compression molding, split sleeve brick is used machine pressure molding.

Whether it is monolithic or split type, the inner holes is a circular structure of the through-hole. The hole size according to tapping time, and the wall thickness is generally 50-100mm. The hole shape is divided into straight and trumpet-shaped. Experiments show that the trumpet-shaped hole and the circular inlet shape, the tapping speed is faster, which means that the interference between the molten steel and the tap hole is weakened and the water flow is relatively stable, shortens the tapping time. There have many kinds of refractory products in our factory.

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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Reasons for mesh cracking of high alumina bricks

In addition, high alumina bricks on the surface of the network cracks generated in the gap between the brick brick surface. Therefore, it can be inferred that when the excess air coefficient in the kiln is small or the reducing atmosphere is generated, the CO is easy to be retained in these places due to the smaller slit, so that the Fe2O3 in the product is reduced to FeO; the surface of the channel is smooth , So it will not be affected by changes in the atmosphere, no network cracks. It is important to note that frequent changes in the nature of the combustion atmosphere should be avoided during the firing process. So that this alternating change will cause the surface to be damaged.
The chemical analysis of the surface and the central part of the products with high surface cracks in the surface of the high alumina refractory bricks shows that the Al2O3 on the brick surface is 1% -2% higher than the central part and the SiO2 is 1% -2% Center more than 10 times higher. It was found that the content of mullite was 12% lower than that of the central part, 4% -5% in corundum and 7% -8% in glass. This indicates that during the migration of Na2O, Na + volatilizes and adsorbs on the surface of high alumina brick, which will promote the decomposition of mullite, reduce the mullite on the surface of the product, and increase the corundum and glass phases. As the surface of the liquid phase increased and early appearance, so that the brick surface premature contraction, resulting in the production of reticulation.
Practice shows that in order to avoid and reduce the high aluminum brick surface network cracks, 1.2. High bauxite clinker water absorption were controlled at 4% -5% below, the tube of water absorption should also be controlled at 5.5 % Below, the excess air coefficient control between 1.1-1.2 is appropriate, so that high alumina brick firing in a stable weak atmosphere.
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How to distinguish the quality of high alumina bricks

High alumina brick is mainly used in lining of blast furnace, hot blast stove, furnace top, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is also widely used as the open - hearth furnace, pouring system plug, water - mouth brick, etc.

It is featured by good quality, high refractoriness, long service life, and it is the most widely used by the industrial furnace. As the quality of it deters the service life of furnace, it’s very important to distinguish the prime and common one, the following can be referred to choose the good high alumina bricks.

Firstly, color is important for high alumina bricks, the prime one has smooth apprearance, it’s yellow white, the four sides are flat, with no broken corners and no cracks.

Secondly, it’s better to weigh, on average, the weight of the first grade is about 4.5kg and the second grade is 4.2kg, the third grade is 3.9kg.
In all, hope those is helpful to choose the prime generality high alumina brick as per your application.

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The high temperature compressive strength of the refractory fire bricks

The high temperature compressive strength of the refractory brick china (abbreviated as HCS) refers to the maximum pressure (in MPa) per unit area of the material at high temperatures above 1000-1200 °C. The compressive strength of the refractory material generally varies with increasing temperature. From the normal temperature from the temperature rise, the intensity of a straight line down. Since then, some of the material continues to decline with increasing temperature; some materials rise as the temperature rises to a certain extent and rises to a maximum temperature at a specific temperature, followed by a sharp drop. The following figure is a number of commonly used china refractory brick high temperature compressive strength with temperature changes.
The change in the high temperature compressive strength of the refractory fire brick is controlled by changes in certain components, especially those in which the matrix or its bound phase occurs at high temperatures. In general, the sintered refractory raw material, which is entirely composed of crystal, is prone to plastic deformation due to its grain and grain boundaries at high temperature, especially when its loading speed is small, so that the strength decreases with the temperature reduce. When some of the crystal phase between the melting point at high temperature or the formation of melt, such as silica brick, clay brick and high alumina brick, the matrix is mainly composed of glass phase, with the temperature rise, the strength of such multi-phase material the microstructure decreases with temperature. When the temperature is further improved, due to the viscosity of the glass phase from brittle to toughness, so that the material between the particles more firmly, so that the strength was significantly improved. Then, as the temperature increases, the melt viscosity of the material decreases sharply, and the strength of the material decreases sharply.
Changxing refractory are mainly producing high alumina brick, high alumina refractory bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please contact us anytime.
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The details of high alumina brick

High alumina brick is containing Al2O3 more than 48% of aluminum silicate products. According to the different composition of minerals, high-quality refractory products are divided into corundum, mullite a just jade and silicon stone three categories. Corundum products, AI2O3 content of more than 95%, the basic mineral corundum (A12O3), raw materials for natural or artificial corundum, but also fused corundum products. The basic mineral of mullite-corundum is mullite (3A12O3.2SiO2), the rest is corundum and glass phase. Silica stone stone raw materials for the sillimanite (Al2O3 · SiO2), the basic minerals are mullite and glass phase. A large number of industrial applications are mullite and silicon wire stone high alumina brick. With the increase of Al2O3 content and the decrease of glass phase, the refractoriness and resistance to rapid cooling of the products are improved, and the resistance to slag resistance, especially for acid slag, is enhanced.
The main raw material of high alumina bricks is high bauxite, which contains minerals such as boehmite, boehmite and kaolinite. The bauxite is calcined and the minerals are converted to corundum and mullite crystals at different temperatures. And in the 1400-1500 ℃ temperature, corundum and quartz combined with the second mullite, crystal growth. In the high-aluminum clinker with soft raw clay as a binder. The production process of high alumina brick and clay brick is basically the same.

Most of the performance of high alumina brick is better than refractory fire brick, but the thermal stability is slightly lower than clay brick. With the different content of Al2O3, ordinary high alumina brick is divided into three grades: (LZ) -65, (LZ) -55, (LZ) -48.

As the main component of high alumina brick AL2O3 is an amphoteric oxide, acid and alkaline slag erosion can resist the erosion of iron oxide skin also have a certain resistance. It is often used to build the soaking furnace bottom, the lower furnace wall, the exhaust outlet at the vault, in the continuous heating furnace, the bottom of the furnace wall, burner brick, ceiling can be used high aluminum brick masonry. High aluminum bricks are also commonly used as lattice bricks, repairing thermal storage rooms.

High alumina brick in the industrial advanced countries, the proportion of total refractory materials is about 8-14%, China's high alumina bauxite rich resources for the development of high alumina brick to create favorable conditions.

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The specification of refractory bricks

Refractory firebrick is aluminum silicate refractory material, with A12O3 and SiO2 as its basic chemical composition, according to A12O3 and SiO2 content ratio, this type of refractory material is divided into three kinds: semi-silica brick (A12O3 15 ~ 30%), Clay brick (A12O3 30 ~ 48%), high alumina brick (A12O3> 48%). Clay brick is one of the largest and most widely used, the output of the total output of refractory materials of about 60 to 70%.
Refractory brick raw material is calcined after A12O3 + TiO2 content of not less than 30% of the china refractory brick, alkali and alkaline earth metal oxides and iron oxide content should be as little as possible, generally about 5-7%. Fire resistance of refractory clay must be no less than 1580 ℃. Clay raw materials after calcination, broken, ingredients (adding soft clay as a binder), pressing molding, drying, firing and other processes, you can get finished refractory bricks.
Refractory firebrick is weak acid refractory. As the chemical composition of the larger fluctuations in the production methods are different, the difference in firing temperature, so that the nature of clay brick changes. Ordinary clay brick according to the composition of the content of Al2O3 is divided into (NZ) a 40, (NZ) a 35, (NZ) a 30 three grades. The refractory degree of clay brick is above 1600 ℃, but the starting softening temperature is very low, only 1250 ~ 1300 ℃, and the load softening start temperature and the final temperature (fflJ40% deformation temperature) interval is large, this interval is about 200 ~ 250 ℃. Clay brick is very important in this nature, it makes the clay brick, although not too high refractoriness, but still can be applied to many high-temperature thermal equipment. Clay brick quenching and cooling is better, at 850 ℃ water cooling up to 10 to 25 times. Clay brick can resist weak acid slag erosion, little resistance to alkaline slag, increase the content of Al2O3, can improve the ability of alkali-resistant slag.
The refractory firebrick is rich in raw materials, the manufacturing process is simple and the cost is the lowest, and it is widely used in the furnace, flue, chimney, waste heat utilization device and burner of various heating furnaces and heat treatment furnaces. Chinafirebrick 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.
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Refractory bricks used for different parts of blast furnace

Blast furnace is the main equipment for ironmaking, and clay brick is the earliest furnace lining material used in blast furnace. Blast furnace has the advantages of large output, high productivity and low cost, which is unmatched by other ironmaking methods.

The refractory materials and refractory bricks used in diffreent parts of blast furnace are as follows.

(1) Furnace hearth
One of the main functions of furnace hearth is to hold molten iron safely. The hearth refractory material must be stable enough when the temperature is highter than 1500 ℃. So for furnace hearth bottom, we need to choose carbon brick which has the advantages of anti-molten iron penetration, good melting, alkali resistance erosion, good thermal conductivity. And we can use small carbon brick to take the place of large carbon block, or construct ceramic rings on the carbon bricks.

(2)Tuyere zone and bosh
Temperature in tuyere area and furnace bosh is the highest in the blast furnace. The hot gas temperature produced in front of the tuyere rises at a high speed, the temperature can reach 1600 ℃ and higher. When 1450 ~ 1550 ℃molten iron and slag flow furnace hearth and finally flow to the furnace bosh, there will be a variety of metallurgical reactions happen in this area violently. Those two areas need refractory materials with characteristics of good resistance to high temperature and slag erosion, good alkali resistance, anti carbon dioxide and anti water oxidation. China refractory bricks we can use in this area are corundum brick, alumina carbon brick, hot pressed semi-graphite carbon brick, SiC brick and so on.

(3)Furnace bosh and lower furnace stack
The lower furnace stack is the position of root cohesive zone where the temperature is quite high, but slag layer or stable slag layer self protection can not be formed. This are need ds refractory materials which can bear severe temperature fluctuations, and also has advantages of alkali metal erosion, zinc erosion, carbon monoxide erosion, etc. What’s more, refractory materials used in furnace bosh and lower furnace stack should have good thermal shock stability, high temperature resistance, good alkali resistance and other properties. Refractory brick china can be used in these two areas are high alumina brick, corundum brick, alumina carbon brick, SiC brick and so on.

(4)The middle and upper part of furnace stack
The furnace stack middle part’s temperature is lower than that of furnace stack lower part. People genarally use high alumina brick, corundum brick and silicon carbide in furnace stack middle part. The temperature in furnace stack upper part is relatively lower than other parts, and it mainly affected by the wear and impact of the burden, alkali metal, zinc and carbon deposition erosion. This area requires refractory material has advantages of good wear resistance, good alkali resistance and good thermal shock stability. Refractory bricks can be used in this area are clay brick, high alumina brick, sillimanite brick, corundum brick. There is a trend that cooling walls are taking the place of refractory bricks used in blast furnace.

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The specification of firebrick in gasification furnace

Clay refractory bricks as an important refractory, changxing refractory to tell you about clay refractory in the gasifier in the standard use, there have been some problems should be avoided?

Clay refractory bricks in the operation of the gasifier has also occurred in the oxygen load fluctuations, and sometimes oxygen regulator valve will cause changes in oxygen load, and sometimes large particles will suddenly stuck high pressure coal slurry pump valve, coal slurry flow suddenly caused by Oxygen is relatively excessive. Oxygen fluctuates directly after the furnace temperature fluctuations, oxygen fluctuations in the range of sometimes 500m3 ~ 600m3, the maximum reached over 1000m3 or so. Oxygen suddenly rose, resulting in a sudden rise in furnace temperature, will suddenly burn high temperature thermocouple, this situation on the clay refractory brick is great, should try to avoid. First of all, we all know that the furnace temperature on the life of the refractory lining is very important, so to strictly control not overheating. Under the normal production conditions, the clay refractory brick surface has a layer of cinder layer, in fact, slag is dynamic, low temperature slag thicker, high temperature slag thinner, suitable thick slag layer can slow down the high temperature gas and slag Scouring. The same time as
The above is on the clay refractory fire bricks in the gasifier in the standard use, hoping to bring you help. Is a professional refractory production enterprises, the company qualified, advanced equipment and experienced. Product quality is strict checks, deep products of our customers love. At present, the company produced refractory products are shaped bricks, high alumina brick, square brick, clay refractory bricks, we warmly welcome the needs of customers to visit the company to discuss and seek common development.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website. Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick, 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.

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The application and features of High Alumina Brick

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.
Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.
Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.
In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.
As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.
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The operation instructions of converter furnace tap hole

1.The maintenance standard of tap hole
Please ensure there is no deformation of the tap hole and meets the requirement of slag stopping. Tap hole brick should be horizontal and its shape should be round.
The diameter of tap hole should be less than 140mm, the length should be more than 400mm. Tapping time should be more than 1 minute and 30 seconds, or it should be replaced.
2.The maintenance operation of tap hole
Before removing tap hole after using, use ring rolling machine to clean out the remaining sleeve and slags, if there is steel remaining, use oxygen lance.
Place the precasted tap hole bricks in from the outside, seal the outer gaps with filling material, after the filling material combined and beding hard, level the convertor, fill the inner gap with diluted Martin sand. Inner mouth should be slightly concave, after sintering for 5 mintues the convertor can be lifted.
3.Other matters need attention
The remaining steel and slad on the tap hole coat should be removed before changing shifts.
The remaining steel at the outer mouth of tap hole should be removed after each tapping.
Please ensure the shape of tap hole is round during using.
4.Make log sheet.
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The different uses of high alumina bricks

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.

Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.

Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.

In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.

As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

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International standard for the volume density of firebrick

China refractory brick is divided into ordinary clay refractory bricks, dense clay refractory bricks, high-density clay refractory bricks, silica bricks, magnesia carbon bricks, aluminum-magnesium carbon brick, the bulk density of different, some soft, and some hard.

According to the different types of raw materials used in the production of refractory bricks, the density of the refractory bricks china is different. The general refractory is measured at the factory before the bulk density and bulk density: the ratio of the mass of the dried product to its total volume, expressed in g / cm3 , The bulk density index is the main indicator of the degree of product density, high density, you can reduce the external slag and other invasive.

Ordinary clay refractory bricks are generally 1.8 ~ 2.0g / cm3, dense clay refractory bricks are generally 2.05 ~ 2.20g / cm3, high dense clay refractory bricks are generally 2.25 ~ 2.30g / cm3, silica bricks are generally 1.80 ~ 1.95g / cm3 , Magnesium bricks are generally 2.60 ~ 2.70g / cm3, aluminum and magnesium.
Carbon brick is generally 2.90 ~ 3.00g / cm3, the product of the bulk density index is the product volume and the composition of the comprehensive reflection of the composition of minerals, because it is easier to measure, in production is usually used as a means to determine the degree of sintering products.

We are mainly engaged in the production of refractory bricks, high alumina bricks, high alumina refractory bricks, alkali-resistant bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina bricks, Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.

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Prevention and elimination of forging cracks (2)

Ultrasonic testing showed that the existence of cracks and pore defect of large forgings is an important cause of waste, most of which is due to internal blank there are loose, coarse grained inclusions, and cracks. They are due to the local inhomogeneous deformation, under great stress concentration and shear stress, which leads to the closure, compaction and the generation of deformation damage. Therefore, smelting of refractory raw materials, hot forging comprehensive control, cracks and eliminate the cause and condition is the effective measures to improve forging quality. However, for large forgings with inner crack defects have the healing repair, reopening to prevent scrap also has important economic significance.

The principleof crack repair: any structure and composition of heterogeneous refractory materials (including micro cracks), in the permit conditions, will tend to homogenization. Its essence is in force (diffusion concentration, electric field, stress field gradient) under the effect of diffusion and migration of metal atoms, the orientation of inner crack healing.

Now the application of high temperature diffusion treatment, pressure diffusion, diffusion and plastic deformation of the combination of healing methods. It have get obvious effect in the large tube plate, large module inclusion crack repair achieved remarkable results, and in the rolling steel tube, crack control.
The crack initiation and propagation in the forging process can be prevented and eliminated by using the internal crack repair mechanism effectively by means of the study and test method of hot forging crack, and combined with the microstructure and thermodynamic analysis of the forging cracks.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
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The classification of complicated shape brick

Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory brick manufacturers suggest that special-shaped refractory bricks according to the preparation process can be divided into firing bricks, not burning bricks, fused brick (cast brick), fire-resistant insulation bricks; specific type of refractory bricks by shape and size can be divided into standard Brick, ordinary brick, and so on. Shaped refractory bricks can be used as high-temperature building materials and structural materials for building furnaces and various thermal equipment. Shaped refractory bricks can withstand various physical and chemical changes and mechanical effects at high temperatures. Such as refractory clay brick, high alumina brick, silica brick, magnesia carbon bricks and so on.

Special strength refractories bricks, its main feature is the early high strength, 3-7 days maximum room temperature compressive strength of up to 30MPa or more, the disadvantage is poor in the temperature volumetric stability, reduced strength, the maximum decline of up to 40%, so require room temperature Strength must meet the design and national standards requirements. The main factors that reduce the temperature strength are: low-calcium high-alumina cement of special-shaped refractory brick in the heating furnace oven heating process to a certain temperature (350 ℃ or so), the hydrate began to dehydrate, the hydration of cement stone structure, dense Degree and strength decreased, castable volume changes, then castable body strength dropped to the lowest point, then stabilized.

With the heating temperature rose to 1100 ℃, the cement stone gradually sintered, shaped refractory brick crystal began to convert mullite crystals. With the rising temperature, mullite crystals continue to grow, castable in the matrix glass phase was liquid state, the formation of high temperature ceramic sintered, the strength significantly improved. At about 1300 ℃, the strength of the special-shaped refractory brick body can reach more than 60MPa, which is a special characteristic of the special-shaped refractory bricks at high temperature.

Xinmi Changxing furnace refractory Tips: You may also on the refractory fire brick, magnesia carbon brick, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.

Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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Thermal conductivity of refractory fire bricks

Chinafirebrick provides refractory products, magnesia carbon brick， calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory fire bricks rely on convection and steady state heat transfer, in the middle of the high temperature furnace if there are two refractory bricks, and there are two different temperatures there is a temperature difference. There will be heat transfer process we call heat transfer.

Refractory tiles convection heat is due to the movement of the internal particles of the fluid, the heat of the refractory brick from one to another. In the furnace refractory tiles heat transfer often encountered, when the fluid and refractory brick wall contact with the heat to the refractory wall or heat from the wall to the phenomenon of fluid.

Conduction heat transfer, also known as thermal conductivity, thermal conductivity is dependent on the thermal movement of micro-particles and the heat from the refractory high temperature zone to the low temperature area, or from the high temperature refractory brick to contact with the low temperature refractory brick process. In the hot environment, the temperature field of the temperature distribution in the interior of the refractory bricks is changed from time to time to the steady state temperature field.

Heat transfer rate: refers to the unit time through the heat transfer surface heat transfer.Heat flux: refers to the unit time through the unit heat transfer surface heat. Heat flux, also known as heat density.

Steady state heat transfer
The heat transfer process at which the temperature of the points in the heat transfer system varies only with the position and does not change with time. The process of steady state heat transfer is characterized by a constant heat transfer rate through the heat transfer surface.

Non - steady state heat transfer
In the non-steady state heat transfer system, the temperature along the points not only changes with the position, but also changes with time. In general, the heat transfer process of the intermittent production operation is non-steady state heat transfer.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
Article Source: Thermal conductivity of refractory bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The application and requirements of refractory brick masonry

China refractory brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1. Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2. Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3. Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
Article Source:More refractory news
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Basic requirements of refractory brick masonry

Refractory fire brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1.Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2.Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3.Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
Article Source: China refractory fire bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The different types of refractory fire bricks

1.Disperse type. There have many refractory news and refractory products information on our factory. Such as Ladle Permeable Brick, fire bricks and other refractory products. You can read more refractory products and know more refractory materials information. It is composed of grains which are used for adjusting the purge plug, which makes it highly permeable. But the permeability can not be manually controlled, it is with low strength and service life.

2.Slit type. The air gap is formed by the septas between the micro dense sheets. Air is blown into refining ladle through these gaps. The adjustability of blowing capacity is better than disperse type but still not easy to control.

3.Aligned pore type. It is produced by putting different numbers of thin stainless steel pipes inside. The air volume and distribution can be manually controlled by this type of purge plug, it is also with higher service life.

4.Maze type. It is produced by putting a netted air supplying tunnel in the fine and closely woven base. Air volume can be easily controlled. Even if one pass is blocked by the penetrated molten steel, air still can go into the refining ladle through other passes.

5.Maze combined with aligned pore type. It combines the advantages of both aligned pore type and maze type, thus offers better performaces.

There have many kinds of refractory products in our factory. What's more, there have many kinds of refractory fire bricks and other refractory products in our factory. Welcome to view our factory anytime.
Article Source: Different types of purge plug for refining ladle
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Come to know the Types of refractory fire bricks

Refractory fire brick manufacturers said that this refractory , high strength, simple construction, wide range of uses, easy to draw, suitable for a variety of industrial furnace masonry, its use and use of different temperatures.
1. Physical and chemical indicators of ordinary refractories clay brick, the size of the allowable deviation and shape products cross-section, should meet the specifications.
Ordinary refractory clay brick for the general furnace refractory masonry. Lining materials, furnace wall, bottom, flue and other operating temperature below 1250 ℃. Combustion chamber parts, allowing the use of more than 1400 ℃.
2. High aluminum brick physical and chemical indicators, product size, allowable deviation, etc., should comply with the provisions of the specification. High alumina bricks are used in general furnace high temperature, wear resistant areas or larger load masonry, burner bricks and special requirements of the masonry. The high temperature zone of the combustion chamber of the dome, allowing the use of temperature 1300 ~ 1650 ℃.
3. Lightweight clay brick physical and chemical indicators, product size allowable deviation and shape products cross-section requirements, should meet the specifications. Lightweight refractory clay brick, as not from the high temperature slag and erosive gas erosion of the furnace lining, according to the different capacity, the use of temperature between 1150 ~ 1400 ℃.
Zhengzhou Changxing furnace refractory material Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Zhengzhou refractory brick factory, Xinmi refractory brick factory .Welcome to view our web to know more kinds of refractory products .

Article source: Types of refractory fire bricks
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