wanhaorefractory

  1. Thermal stress The ladle purging plug directly contacts the high-temperature molten steel, and is subject to the continuous cold air flow, which generates a large temperature gradient, resulting in high concentration of stress. 2.Scour and abrasion The blown gas gives a certain reverse impact force to the working surface of the purging plug , and at the same time has a shearing and scouring effect on the purging plug. 3.Chemical erosion The material of the purging plug reacts with the molten steel penetrating the slit and the slag that has eroded into the working layer, which changes the physical and chemical properties of the working layer of the purging plug and increases the tendency of spalling. 4.Burning oxygen cleaning The high temperature when burning oxygen is very fatal to ladle purging plug , and the melt loss within a few minutes is many times higher than the normal refining erosion. Wanhao is a manufacturer who is specialized in designing various k...

  Improvement measures of extending the service life of steel tap hole of converter 1.The life of the skateboard is relatively low. At present, the material of the domestic converter skateboard is mostly aluminum-zirconium carbon. As the material of the ladle skateboard, it has high strength, good thermal shock resistance, and excellent erosion resistance and corrosion resistance; But for the converter skateboard to block slag technically, the service life of the skateboard is relatively low. 2. The life of the tap hole needs to be further improved. The life of the tap hole is one of the important indicators of the converter sliding plate slag blocking technology. The tapping is caused by the frequent direct erosion and violent erosion of high temperature molten steel and high oxidizing slag, and the effect of rapid cold and hot heat. The mouth is easily damaged. The length of its life directly affects the converter smelting cycle, steelmaking productivity and slag ...

  The tundish is a refractory container, and the molten steel poured from the ladle is distributed to each mold through the tundish nozzle . Continuous casting has the advantages of increasing metal yield and reducing energy consumption, simplifying the steelmaking production process, shortening the process, and significantly improving production efficiency. Tundish as a metallurgical reactor is an important part of improving steel output and quality. Whether for the smooth progress of continuous casting operations or for ensuring that the quality of molten steel meets needs, the role of the tundish cannot be ignored. It is generally believed that the intermediate package plays the following roles: 1. Shunting function. For the multi-stream continuous casting machine, the molten steel is divided by the multi-nozzle tundish. 2. Continuous pouring effect. In the multi-furnace continuous pouring, the molten steel stored in the tundish plays a role as a link when changin...

  Causes of sliding nozzle mechanism: 1) Due to long-time high temperature use, or inadvertent collision in operation, the sliding mechanism has large deformation, which leads to uneven stress on the sliding plate interface. Small gaps will be formed in the parts with small stress surface, which may cause steel penetration between sliding plates. 2) Due to long-time loading and unloading of the sliding car with the lower sliding plate, the error between the sliding car and the upper sliding plate mechanism will be generated slowly, resulting in the formation of small gap between the upper and lower sliding plates. 3) Because the spring used in the mechanism is used in high temperature environment for a long time, sometimes even though it is not in service, it may produce deformation and failure. Under the static pressure of molten steel, the gap between the sliding plates may appear, which may lead to steel penetration between the sliding plates. In serious cases, ...

  At present, there are two main measures to improve the bursting resistance of refractory castables , reasonable drying and heating system and application of explosion-proof additives. Due to the different production conditions in different kilns, it is difficult to formulate a unified and reasonable drying and heating system. Therefore, anti-explosion substances are often added to improve the anti-explosion performance of refractory castables . The new high-strength corrosion-resistant castable has excellent corrosion resistance and good thermal shock resistance, which makes it widely used in the lining of key parts of large kilns. In the production process, the structure, particle size distribution, material and additives were adjusted to improve its anti-cracking performance, but at the same time, some problems were brought, such as too fast setting speed, delayed hardening and instant loss of fluidity, which caused the refractory castable to burst from time to tim...

1. Life: > 100 times 2. Baking time: must strictly follow the baking curve, especially in the early stage, not too high temperature. It can be operated according to the baking curve provided by the previous manufacturer. 3. Construction method: mould and vibrating rod. 4. Ordinary need to repair: need to remove the sintered layer, cover repair to increase life, because repair is more troublesome, customers generally do not repair operations. 5.  Corundum castable i s not used for refining ladles. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc. Article Source: refractory material Company name：Wanhao Refractory Email:sales100@wanhaorefractory.com Website: http://www.wanhaorefractory.com/

The quality of bauxite will affect the control of production technology conditions, equipment capacity, energy consumption and product quality. The evaluation indexes of bauxite quality mainly include aluminum content, aluminum to silicon ratio of bauxite and type of bauxite. 1.Alumina content. The alumina content in bauxite is usually between 45% and 75%. The higher the content of alumina, the better the product quality; 2.The ratio of aluminum to silicon of bauxite. The higher the ratio of aluminum to silicon, the better the quality of bauxite. At present, industrial production of alumina requires bauxite with an aluminum to silicon ratio of not less than 3.0-3.5. 3. Type of bauxite. Different types of bauxite, the technical conditions adopted are also different. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc. Article Sourc...

(1) The vibrating bar must not touch the core and the heat insulating material, so it should be kept at a certain distance from the core and the heat insulating material, but it should not be larger than 50mm. (2) The penetration depth of the vibrating bar shall not touch the underlying castable , but the distance from the lower layer shall not exceed 50 mm. (3) The distance of the insertion point of the vibrating bar should not exceed 200mm, keep the uniform and dense vibration, and slowly lift the vibrating bar when it is pulled out. Do not pull out suddenly to avoid leaving holes. (4) A special person should be in charge of mastering the vibrating rod. If it is found that there are unqualified quality requirements, it should be treated in time to continue construction. (5) Pouring the wall of the package is usually two rounds of material vibration, each feeding thickness is about 250mm, to achieve uniform cloth, and pay attention to uniform vibration, ...

Dolomite brick is a refractory product that is made from calcined dolomite sand.It usually contains over 40% calcium oxide (CaO), over 35% magnesium oxide (MgO) and a small amount of impurities such as SiO2, Al2O3 and Fe2O3.The CaO/MgO ratio of natural dolomite fluctuates greatly. If the CaO/MgO ratio in brick is less than 1.39, which is called magnesia dolomite brick. According to the production process, dolomite bricks can be divided into: tar (asphalt) combined with non-firing bricks, light burning oil immersion bricks and fired oil immersion bricks. Dolomite brick contains free CaO, easy to hydrate in the air disintegration, not suitable for long-term storage. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc. Article Source: Use of auto-flow corundum castable Company name：Wanhao Refractory Email:sales100@wanhaorefrac...

Private steel enterprises' profits in the first three quarters rose by 130%. Steel mills still have the urge to expand production. On November 3, the latest data showed that in the first three quarters of this year, 160 private steel enterprises included in the statistics of the All-China Metallurgical Chamber of Commerce achieved a total sales volume of 1.92 trillion yuan, a year-on-year increase of 12%; net profit reached 168.3 billion yuan, a year-on-year increase of 130%. In addition, the asset-liability ratio was 61.33%, 8% year-on-year down. The release of steel output during the heating season will be reduced this winter, and the supply will not exceed demand, which will help the steel market to run smoothly. For the time being, the positive impact of environmentally-friendly production is greater than the negative impact. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory product...

Corundum castable is a refractory product with Al2O3 content of more than 90% and corundum as its main crystal phase. It is compounded with proper dispersing agent, coagulant, stainless steel fiber and compounded by strict formula It has the characteristics of high temperature, good strength, wear resistance, erosion resistance, high thermal conductivity, thermal shock resistance, corrosion resistance, good sealing, quick setting, etc. Wanhao is a manufacturer who is specialized in designing various kinds of furnace and making refractory products for electric furnace, ladle, tundish, blast furnace, AOD furnace, IF furnace, etc. Company name: Wanhao Refractory Email:sales100@wanhaorefractory.com Website: http://www.wanhaorefractory.com/

The main factors affect the performance of magnesia-calcium brick include MgO / CaO ratio, chemical purity and density etc. The MgO / CaO ratio of magnesia-calcium brick can increase high temperature resistance, chemical erosion resistance of slag,high temperature corrosion resistance and hydration resistance. But it will decrease the magnesia-calcium brick ’s spalling resistance, resistance to the slag penetration and molten steel purification performance. Adding some additives in the production of magnesia-calcium brick can improve some performances of the magnesia-calcium brick . Add appropriate amount of ZrO2 can improve the performance of spalling resistance,  high temperature corrosion resistance and hydration resistance of the magnesia-calcium bricks . ZrO2 is called the “multi-functional” additives of magnesia-calcium brick . At abroad, eye bricks of AOD furnace generally use high-purity, high density sintered magnesia dolomite brick with 1% content of Zr...

During the use of magnesium-calcium bricks , the working end is cracked and peeled off due to changes in furnace temperature and slag penetration. Therefore, improving the spalling resistance of magnesium-calcium bricks is also one of the main ways to increase the service life of magnesium-silica brick linings. The pores in the magnesia calcium bricks can buffer the thermal stress in the magnesia-calcium bricks, prevent cracks from being generated and further expand, and help to improve the heat-stripping performance of the magnesia-calcium bricks . However, the pores in the magnesia-calcium bricks make it easier for the slag to infiltrate into the interior of the brick, forming a thicker deteriorating layer, and accelerating the structural peeling of the magnesia-calcium brick . Therefore, in practical applications, comprehensive consideration should be given to various factors to determine the porosity of magnesium-calcium bricks. In the production of magnesium-ca...

A sudden event can cause molten steel concrete in induction furnace, here are the things that should be kept in mind for remelting. 1.If the induction can not be restart in a short time, 3-5 steel tubes(diameter around 20mm) should be inserted in to the molten steel to ensure gas emmission during remelting. 2.Lean the induction furnace by 15 degree before the top concrete is melted. 3.Power should not be increased until the concrete is softened. If the temperature rises too fast, the expansion of metal exceeds which of lining material, lining material could be broken, induction furnace could be penetrated. After the concrete is softened, power can be rised to that of heat preservation till the surface of concrete is penetrated by the lower level molten steel, then set level of the induction furnace and start melting with normal power. Wanhao is a manufacturer who is specialized in designing various kinds of furnace...

Cold crushing strength Cold crushing strength is the ultimate load per unit area of dense shaped refractory products can withstand without damage at room temperature. The cold crushing strength of pressure-resistant refractory products has a great impact for the production, transportation and use performance, so higher cold crushing strength is better. The high crushing strength indicates that the processed quality is good, structure is uniform, and well sintered. High temperature crushing strength High-temperature crushing strength is the refractory products under the specified high temperature conditions, the unit area can withstand without damage. The high temperature crushing strength of refractory products determines the use scope, which is an important basis for the use of refractory materials . High temperature crushing strength indexes are also meaningful to unshaped refractories, especially refractory castables and fire-resistant plast...

The mixer is mainly used for long-term storage of hot metal and maintain appropriate temperature of iron smelting . When working,generally the temperature in mixer keep 1350 degree temperature and furnace shell is 300-400 degree. When pouring into the hot metal mixer, because of the larger gap, hot metal will produce mechanical impact on the furnace lining.In addition, in order to keep the molten iron temperature in the furnace, the fuel must be injected into to take the flame heating, which also has a certain thermal stress effect on the lining material. According to the mixer working environment and damage reason, it can be analyzed that for the refractory material , it need high mechanical strength, high slag resistance, good thermal shock resistance, low thermal conductivity and small reheating linear change. Refractories are often used magnesia brick, magnesia chrome brick, high alumina brick , clay brick and refractory filler. At the same time as the mixer h...

Refractory castable construction requirements: 1. Winter construction refers to the ambient temperature at +5 ℃ ~ -5 ℃ when the construction. The temperature below -5 ℃ when only the adoption of a reliable anti-cold measures after the construction of gas. 2. Winter construction must refer to winter construction skills initiatives. To do a good job on the work environment of the block, the wind, heating and warm work, to keep the masonry after the temperature of +5 ℃. 3. During the winter construction of castable material, the dry material should be stored in the heating room, and with water spices, mixing material temperature maintained at 10 ℃ or more. Loss of additional chemical accelerator or antifreeze. 4. Winter in the furnace construction, the first insulation layer should be good to mobilize the refractory layer of anti-freeze ability. After construction, masonry covered with plastic sheeting, and then covered with dried vegetables. On the new puzzle kiln, the ...

1.High bulk density and high melting point. Proper sintering between granules under high temperature, but the sintering layer should be thin. High bulk density and proper sintering could keep nozzle filling compound from being scattered and floating into molten steel. 2.Good high temperature chemical stability, no chemical reaction with ladle nozzle , good corrosion resistance and non-wettability to molten steel and slag. 3.Proper granularity. If the granules are too big, molten steel could penetrate into the gaps between them, if too small, the granules could be integrated under high temperature. 4.Natural repose angle should be as small as possible, surface of granules should be smooth and evasive to create good fluidity, which could prevent arching inside the nozzle. 5.Moisture content should be less than 0.5%. Article Source:  The properties requirements on nozzle filling compound Company name: Wanhao Refractory Email: sales100@wanhaorefractory.c...

The properties of magnesia are classified into chemical and physical properties.The chemical properties of magnesia sand is mainly refer to the periclase.  Mgo is the main component in the periclase. Periclase is one of the most common minerals in cement clinker. It can coexist with four kinds of main mineral C3S, C2S, C3A, C4AF in the cement clinker. So periclase has good erosion resistance against cement clinker. （1）Periclase has very high melting point so that the magnesia refractories are charactorized with good high-temperature resistance. （2）Periclase has good thermal conductivity. When using high mgo content refractory , and the kiln skin can not be hung, the surface temperature of kiln body will raise. At that time, not only it will cause a great loss of heat dissipation, but also easy to burn the cylinder. （3）Periclase has high thermal conductivity. So that the thermal shock resistance for magnesia refractories are not enough. In the process of using, t...

More and more steel plants are using tundish exhangeable sizing nozzle recently. Compared with traditional sizing nozzle , the advantages of exchangeable nozzle are: 1.Simple structure, reliable performace, easy to operate. 2.Adopt single tube oil passage control, light cylinder, easy to handle and operate, only one button required for control. 3.The rack and base of cylinder are intergrated, which makes the positioning of slide block precise. 4.The cover of lower slide block is made from cast iron, the coordination of lower slide block and machined face of platen is with high precision, which could avoid leakage accident caused by the unqualification of alide block size. Article Source:  The advantages of tundish exchangeable nozzle Company name: Wanhao Refractory Email: sales100@wanhaorefractory.com Website: http://www.wanhaorefractory.com/