2023年4月11日星期二
2023年4月10日星期一
The main ladle parts and corresponding ladle refractories
The main ladle parts and corresponding ladle refractories
The main ladle parts and corresponding ladle refractories
The ladle is an important equipment in the steelmaking process, which is used to transport and pour liquid steel from the furnace. The main parts of the ladle and their corresponding ladle refractories are as follows:
Ladle lining: The ladle lining is the main part of the ladle, which protects the ladle from high temperature and chemical erosion. The ladle lining is usually made of high alumina brick, magnesia brick, and carbon-bonded brick.
Ladle bottom: The ladle bottom is made of magnesia or magnesia-carbon refractories, which can resist the erosion of molten steel and slag. ......
Source:
Email: info@cxfirebrick.com
2023年1月5日星期四
2022年9月5日星期一
Tap Hole Brick, Hole Fire Brick, Converter Hole Brick
Tap Hole Brick, Hole Fire Brick, Converter Hole Brick
Tap hole brick is made by adopting high purity fused magnesite and graphite as principal raw material, use unique antioxidant and resin as binding agent, formed by isostatic compaction.
source:
Email: info@cxfirebrick.com
2022年8月30日星期二
Use of tundish metering nozzle
Use of tundish metering nozzle
Use of tundish metering nozzle
metering nozzleThe tundish metering nozzle is one of the refractory materials for billet continuous casting, and it plays the role of controlling the flow of molten steel. The molten steel flows into the mold through the tundish metering nozzle at a constant speed and stably, which is a necessary condition to ensure the normal operation of continuous casting. As a flow control element, the metering nozzle should have good anti-scour and anti-erosion capabilities.
Source:
2022年8月29日星期一
Dry Ramming Mix, Gunning Mix, EAF Gunning Mix
Dry Ramming Mix, Gunning Mix, EAF Gunning Mix
Gunning mix for electric furnace slag zone
Gunning mix taking use of high quality dead burnt magnesia sand and other alkaline composite material,formed by reasonable particle size distribution.
source:
2021年12月3日星期五
2021年12月1日星期三
Classification of tundish refractory
The refractory materials used in tundish can be divided into three categories in terms of function:
The first type is the lining material, which is mainly composed of thermal insulation layer, permanent layer and working layer;
The second type is flow stabilizing components, including retaining weir, retaining wall, ceramic filter, flow stabilizer, etc;
The third type is the flow control part, including plug rod, sliding nozzle, sizing nozzle and intrusive nozzle.
.........
Source:
https://www.yilongrefractory.com/news/Classification%20of%20tundish%20refractories.html
E-mail: sales8@chinaelong.com
2021年11月29日星期一
2021年11月15日星期一
2021年11月9日星期二
2021年11月3日星期三
2021年11月1日星期一
2021年10月25日星期一
2021年10月21日星期四
2021年10月19日星期二
2021年3月11日星期四
Thermal conductivity of refractory bricks
The thermal conductivity of fire bricks is represented by the thermal conductivity that has the ability to transfer heat. Thermal conductivity represents the amount of heat per in unit area, unit time and unit temperature gradient in the energy transfer process.
At 1000 ℃The thermal conductivity of various refractory bricks rate as shown below. The thermal conductivity of different materials is often very different. At normal temperature, the thermal conductivity of various refractory bricks can be from a few percent to several tens (w／(m℃), which is nearly a thousand times lowst than the highest value. As the temperature rises, although the difference between the thermal conductivity of various refractory bricks tends to decrease, but the difference is still large. Such as 1000 degrees centigrade, the thermal conductivity of lightweight silica is only about 0.35W, recrystallized silicon carbide products is about 17.5W／(m℃), graphite can be up to 35W / (m℃).
In addition to temperature, the thermal conductivity of refractory material bricks is closely related to its chemical composition and structure. When refractory bricks are made of crystal, the properties of crystal have obvious influence on thermal conductivity. As we all know, the thermal conductivity of inorganic nonmetallic materials is generally much lower than that of metal. Because inorganic nonmetallic materials are different from metals with metal bonds, there are very few free electrons. The thermal conductivity caused by free electrons in this material is extremely limited, and the lattice vibration is mainly deviated from the degree of resonance. The greater the degree of deviation from the resonance, the thermal conductivity is smaller. The degree of lattice vibration deviation increases with the difference in the molar mass of the constituent components, so the thermal conductivity of the element is the largest. (So the thermal conductivity of graphite is relatively large).
China refractory bricks have a complex structure of crystals, the thermal radiation of the lattice is greater and the thermal conductivity is smaller, such as MgO, A12O3 and MgAl2O4 Such as MgO, A12O3 and MgAl2O4 are equiaxed, but the structure of MgAl2O4 is complex and the thermal conductivity is low. Non-coherent crystals, in the direction of dense particles along the crystal, thermal conductivity is larger. The quartz along the C axis has a dense accumulation of particles, and its thermal conductivity (13.6W／(m℃)) is about twice as high as that of the C axis. The layered structure of graphite, the thermal conductivity parallel to the direction of the level of about 4 times in the direction perpendicular to plane direction.
If the crystal is defective, the formation of substitutional solid solution, because the rules of the crystal structure of the destruction caused by thermal scattering phenomenon, resulting in a decrease in thermal conductivity. Other crystal defects such as vacancies, dislocations and so on, also has a similar effect. Due to the thermal scattering of the grain boundary, the thermal conductivity of the polycrystalline material is lower than that of the single crystal. The refractory raw material of fine grain is lower than that of coarse grain. The material contains impurities, the thermal conductivity is lowered due to the scattering effect.
When refractory bricks contain glass phase, due to the amorphous structure of the disorder, the probability of collision between atoms. So compared with the crystal, thermal conductivity is low. When the refractory brick contains pores, because the thermal conductivity of the gas is smaller than the solid, so with the increase in porosity, the thermal conductivity of the material decreases. This is the basic reason for the low thermal conductivity of porous materials.
Thermal Conductivity
1-Silicon Carbide Brick;2-Magnesia Brick
3-Silicon Carbide Brick(SiC70%);4-Corundum Brick
5-Silicon Carbide Brick(SiC50%);6-Sintered Dolomite Brick
7-Zirconia Brick;8-Chrome-Magnesite Brick
9-Corundum(A12O390%);10-Sillimanite Brick
11-Olive Brick;12-Chromite Brick
13-Silica Bricks;14-Dense Clay Bricks
15-Clay Brick
Article Source:
http://www.chinafirebrick.com/Company_News_128.html
E-mail:sales1@chinafirebrick.com
2017年11月20日星期一
The trend of fused magnesia sand price
From news on foreign media that influenced by Chinese market, Fused magnesia sand price in European market is also higher and higher now, while the price is more than 1500USD/T now.
The main reason is still because of lacking supply of refractory raw material. What was worse that there is no any evidence show that the price will be lower in nearly future.
Winter is coming, and environment pollution will be heavier. Chinese government will carry out more and more environment protection policy, while more and more plant need to close which result in higher and higher price of fused magnesia sand.
Most purchaser from all of the world calculate that fused magnesia sand price will be higher and higher in coming 2018.
What is more, some foreign purchaser indicate that magnesia sand quality is not as good as before. This is also because there is not enough mineral supplying, which result in poor quality than before.
So if you need refractory products, please purchase as soon as possible. Time is money for you.
Article source:
http://www.yilongrefractory.com/news/The%20trend%20of%20fused%20magnesia%20sand%20price.html
E-mail:sales8@chinaelong.com
The main reason is still because of lacking supply of refractory raw material. What was worse that there is no any evidence show that the price will be lower in nearly future.
Winter is coming, and environment pollution will be heavier. Chinese government will carry out more and more environment protection policy, while more and more plant need to close which result in higher and higher price of fused magnesia sand.
Most purchaser from all of the world calculate that fused magnesia sand price will be higher and higher in coming 2018.
What is more, some foreign purchaser indicate that magnesia sand quality is not as good as before. This is also because there is not enough mineral supplying, which result in poor quality than before.
So if you need refractory products, please purchase as soon as possible. Time is money for you.
Article source:
http://www.yilongrefractory.com/news/The%20trend%20of%20fused%20magnesia%20sand%20price.html
E-mail:sales8@chinaelong.com
2017年10月23日星期一
Refractory for heating furnace
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| Refractory for heating furnace |
In addition to water-cooled cast iron out of the trough, the general use of high alumina brick or masonry masonry, the service life of 3 to 6 months. Sintered mullite or fused mullite large brick masonry, high strength, good wear resistance, but the thermal shock resistance is poor, easy to crack, its life around 1a. The use of heat-resistant steel fiber staggered corundum refractory castable in the field into the overall steel trough, the service life of more than 2a.
Ceramic chute with a small push-type refractory furnace, from the corundum a silicon carbide slide rails composed of ceramic slide. In the length of the furnace with a refractory brick masonry two or four rows of the wall. In the base wall masonry high alumina silicon carbide brick, and then install the sliding rail brick and composed of ceramic slide. Billet in the slide on the move to achieve the upper and lower sides of the heating, with less energy, billet without black and so on. Ceramic chute to withstand high temperature, billet load, high temperature wear and corrosion of iron oxide slag and other effects, the use of more demanding conditions, the life of about 1a. The bottom of the water cooling 'adiabatic refractory materials, large and medium-sized push silver or walking beam furnace, the bottom of the water cooling pipe is a vertical, horizontal distribution and support the role of thick-walled water cooling pipe composition. The purpose of adiabatic is to reduce the heat from the cooling medium, reduce the billet black print and improve the quality of heating.
The adiabatic way is divided into special-shaped clay brick mosaic or horseshoe-shaped brick hanging, refractory plastic or refractory castable made of welded tile prefabricated block welding or with the material and refractory fiber felt on-site dressing. Life is generally 3 to 12 months. When the use of high-quality refractory plastic, ultra-low cement or cement-free refractory castables for field dressing, the life of more than la. Flue and smoke for their own use refractory lase lining generally with dry clay masonry, can also be used refractory castable prefabricated block hanging or on-site watering, and sometimes can be used refractory spray coating construction. Red brick or concrete chimney in high temperature area with refractory masonry. Metal chimney wall welding metal anchor nails, sometimes with metal mesh, the use of lightweight refractory castable or refractory spray for lining, construction convenience, integrity, long service life. (Refresable for rehea-ting fumace) Refractory materials used in masonry furnaces and related parts. The furnace is used for rolling or forging steel. Heating billet or small steel ingot thermal equipment, the use of the temperature is generally 13 of a 1 40. ℃.
This type of furnace is generally made of refractory clay brick masonry, heating section and soaking section roof is also useful 3-high aluminum brick 'lining damage is mainly due to high temperature, thermal stress, air erosion and mechanical collision caused by the role of high temperature The lower part of the furnace wall, the bottom of the furnace and the water-cooled tube packing layer and other parts are also affected by the erosion of molten iron oxide slag, therefore, masonry or mattress magnets for the protective layer, water pipe dressing layer with high alumina refractory. With the large-scale rolling mill and high efficiency, the heating protection made a higher demand, its development trend is large, low consumption, pollution-free and operational automation, building materials and therefore open and lift two The The door is generally made of clay brick, refractory castable or refractory plastic, high aluminum insulation brick or refractory fiber mats and other materials for lining.
Side open the door can use a furnace service, lift door due to temperature fluctuations and mechanical impact and other factors, the service life of about la. Out of the riveting with refractory material with the side of the billet heating furnace. In addition to water-cooled cast iron out of the trough, the general use of high alumina brick or masonry masonry, the service life of 3 to 6 months. The use of sintered or fused mullite large brick masonry, high strength, good wear resistance, but the thermal shock resistance is poor, easy to crack, its life around 1a. The use of heat-resistant steel fiber staggered corundum refractory castable in the field into the overall steel trough, the service life of more than 2a. Ceramic chute with a small push-type refractory furnace, from the corundum a silicon carbide slide rails composed of ceramic slide. In the length of the furnace with a refractory brick masonry two or four rows of the wall.
In the base wall masonry high alumina silicon carbide brick, and then install the sliding rail brick and composed of ceramic slide. Billet in the slide on the move to achieve the upper and lower sides of the heating, with less energy, billet without black and so on. Ceramic chute to withstand high temperature, billet load, high temperature wear and corrosion of iron oxide slag and other effects, the use of more demanding conditions, the life of about 1a. The bottom of the water cooling 'adiabatic refractory materials, large and medium-sized push silver or walking beam furnace, the bottom of the water cooling pipe is a vertical, horizontal distribution and support the role of thick-walled water cooling pipe composition. The purpose of adiabatic is to reduce the heat from the cooling medium, reduce the billet black print and improve the quality of heating. The adiabatic way is divided into special-shaped clay brick mosaic or horseshoe-shaped brick hanging, refractory plastic or refractory castable made of welded tile prefabricated block welding or with the material and refractory fiber felt on-site dressing. Life is generally 3 to 12 months. When the use of high-quality refractory plastic, ultra-low cement or cement-free refractory castables for field dressing, the life of more than la.
Flue and smoke for their own use refractory lase lining generally with dry clay masonry, can also be used refractory castable prefabricated block hanging or on-site watering, and sometimes can be used refractory spray coating construction. Red brick or concrete chimney in high temperature area with refractory masonry. Metal chimney wall welding metal anchor nails, sometimes with metal mesh, the use of lightweight refractory castable or refractory spray for lining, construction convenience, integrity, long service life. Refractory material for refineries for rehea-ting fumace The refractory used in masonry furnaces and related parts The heating furnace is a thermal equipment used to heat billets or small billets when rolled or forged steel. Generally for a 13 of 13. ℃. This type of furnace is generally made of refractory clay brick masonry, heating section and soaking section roof is also useful 3 high aluminum refractory bricks' lining damage is mainly due to high temperature, thermal stress, air erosion and mechanical impact caused by such a high temperature The lower part of the furnace wall, the bottom of the furnace and the water-cooled tube packing layer and other parts are also affected by the erosion of molten iron oxide slag, therefore, masonry or paving magnesia for the protective layer, water pipe dressing layer with high alumina refractory.
More refractory material:
http://www.yilongrefractory.com/AllProductServlet?id=1&number=20
E-mail：sales8@chinaelong.com
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