wanhaorefractory

  After summarizing the actual operating experience, the main reasons for the problems in the use of the submerged entry nozzle and the solutions were found. Specifically in: 1) Fracture before or during the process of pouring steel at the nozzle. The submerged entry nozzle is about 1 meter long but only fixed by the upper part, so it is mechanically damaged during transportation, hard objects collide with the nozzle during installation, unstable or falling too fast when lifting the intermediate tank, and the impact on the nozzle during the pouring process causes the root fracture. In order to prevent the nozzle from breaking, mechanical collision should be avoided as much as possible during transportation and installation, and the problem should be stopped in time, and a layer of rubber pad should be placed on the intermediate tank seat frame to make the crane take off and land smoothly. 2) The slag line is eroded too quickly. After continuous c

  Tundish dry vibrating materials can be constructed on-site by two methods, direct vibration and indirect vibration, to obtain a uniform and dense overall structure. The direct vibration method uses a vibrator to directly vibrate the refractory material. After a layer of refractory material is fully vibrated by the vibrator, the surface of the refractory material is raked, filled with a new layer of material, and then fully vibrated by the vibrator. This is done layer by layer until the construction is completed. During construction, delamination between layers should be avoided. Indirect vibration is the vibration force generated by the vibrator fixed on the inner or outer mold is transmitted to the dry vibrating mix through the template, so as to make it dense. 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:

 Y₂O₃ can stabilize ZrO₂, the thermal expansion coefficient of pure monoclinic ZrO₂ is small, but the thermal expansion coefficient is anisotropic; the thermal expansion coefficient of cubic ZrO₂ is related to temperature, the higher the temperature, the greater the thermal expansion coefficient, thermal expansion will generate thermal stress, which will affect the material The thermal shock resistance. At the same time, when Y₂O₃ is corroded by slag, it can form Y₂O₃-CaO-SiO₂ eutectic and MgAl₂O4 spinel. Compared with the Y₂O₃-CaO-SiO₂-Al₂O3 eutectic formed when the magnesia-zirconium refractory product without Y₂O₃ is eroded by slag, its eutectic temperature is higher, and it can consume part of SiO₂, reduce the viscosity of slag, and effectively hinder melting. The continued infiltration of slag improves the slag resistance. prepared MgO-ZrO₂-Y₂O₃ composite material by co-precipitation method and studied its mechanical properties. The results show that the introduction of Y₂O₃ into

  1. Mechanical reasons of sliding nozzle When the static pressure of the molten steel is greater than the surface pressure of the slide gate plate , a gap occurs between the slide gate plates , which causes steel leakage between the slide gate plates during the pouring process. 2. Operation and installation reasons of slide gate plate (1) The installation surface of slide gate plate is not cleaned, or too much refractory mud is used when installing the upper nozzle; (2) The surface pressure of the slide gate plate is not enough; 3. The quality reason of the slide gate plate (1) The material of the slide gate plate cannot meet the steel casting requirements of the steel grade; (2) Cracks are generated during the use of the slide gate plate and are abnormally enlarged. 4. The operation reasons of steel casting When the nozzle can not be automatically poured, it needs to be burnt with oxygen. If the slide gate plate is not fully opened, it will be burnt with oxygen, which wil

  Different types of tundish 1. High temperature tundish The tundish is set up for a specific metallurgical process, the lining is made of magnesia brick, and it is preheated to about 1500°C. 2. Hot tundish That is, a kind of tundish commonly used in steel plants at present, which uses fired bricks or unfired bricks or castables as the lining of the tundish. Before pouring, it should be preheated to 800～1100℃. 3. Cold tundish The insulation board is used as the lining, which can be used without preheating before pouring. As for the choice of which tundish type and which material is better for the lining, it depends on the cast steel, smelting method, baking conditions and the ability of the steel plant itself. The tundish lining is mainly composed of the following parts: (1) Insulation layer (10~30mm) This layer is next to the steel shell of the tundish, and its material is usually asbestos board, insulation brick or lightweight castable. (2) Perma

  According to production process, fire clay brick is divided into machine made brick and handmade brick. According to structures, fire clay brick is divided into solid brick and hollow brick, and hollow brick can be divided into load-bearing brick and nonbearing brick. Fire clay brick is made at different shapes according to different using requirements. Advantages of fire clay brick： 1. Fire clay brick is environmentally friendly and belongs to resource recycling bricks, so we can rest assured use fire clay brick. Fire clay bricks won’t be harmful to our health. 2.Fire clay brick has advantages of fireproof and heat insulation. Used clay brick can be used as concrete so that to save a lot of resources. 3.The price of fire clay brick is not as expensive as that of other fire bricks. Light weight brick is more expensive than fire clay brick. Besides, fire clay brick is very cheap and very durable 4. Fire clay brick has good moisture-proof function

  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 plastic materials. So the high te

  Sintered magnesia purging plug : the sintered magnesia material refers to the refractory material with more than 80% MgO content, which belongs to alkaline refractory material. It has the advantages of high refractoriness, strong resistance to alkaline slag erosion, free from Ca and Cao erosion, and no pollution of molten steel. Magnesia chrome purging plug: magnesia chrome material is a refractory material with MgO and Cr2O3 as the main components and periclase and spinel as the main mineral components. Chrome ore is not inert to steelmaking slag and has compatibility with other refractories, so the appearance of magnesia chrome material can improve the thermal shock resistance of magnesia material. High alumina purging plug : high alumina material refers to the refractory material with more than 48% alumina content, which has the characteristics of high cold and hot strength, good wear resistance, heat shock resistance, spalling resistance and good volum

  Sometimes when the drain is in use, a gap is formed between the lower slide plate and the molten steel penetrates into the gap to form a clamping steel. In severe cases, it will pass through here, causing a safety accident. There may be the following reasons for ladle nozzle clamp steel: (1) During hot repair, if the spout screw sleeve is not tightened in place or expands under high temperature, there will be a gap between the spout and the spout, causing the spout to loosen. Deformation of the spigot, or poor contact between the spout and spigot, and the spigot does not provide a good fixation effect, which may also cause the spout to clamp steel or even leak. (2) It may be that the fire mud of the joint between the drain and the lower sliding plate is too thick, the bonding strength is poor, and the shrinkage during sintering is large, which causes the refractory material of the drain to move down, produce looseness, and easily cause steel clamping, or even It'

  The causes of steel leakage between plates during continuous casting quick change submerged nozzle are analyzed. The results show that the main causes of steel leakage between plates of submerged entry nozzle are related to factors such as nozzle surface oxidation, slow extension speed of quick change cylinder and unreasonable operation of nozzle change.? According to the analysis results, corresponding control measures are formulated, including improving the layout of argon pipeline in tundish, By improving the extension speed and installation accuracy of the quick change cylinder, improving the oxidation resistance of the nozzle surface, optimizing the baking process of the submerged nozzle , changing the nozzle operation and increasing the argon sealing flow, the annual steel leakage between plates of the caster is finally reduced from an average of 4 times to 0 times, and a good control effect is achieved. Wanhao is a manufacturer who is speci

  The main function of the heating furnace is to heat the billet to the rolling temperature until it has sufficient plasticity so that it can be rolled to the required cross-section, size or shape by the hot rolling mill. The material chemical composition and grade are different, and the required rolling temperature also varies. According to the metallurgical properties and productivity of the raw materials, the heating rate of the heating furnace must also meet specific requirements and goals. During the process of the heating furnace, the material flow continuously passes through the heating furnace to heat the raw materials to a certain temperature. The heating furnace is mainly composed of a regenerator that is insulated by refractory materials , a furnace that supports and transports heating elements, a furnace body, and a heat recovery system. The heating furnace uses oil, natural gas, electricity and coal as the main fuels as heat sources. The furnace temperature

 1. When the water inlet is installed, it is not tightened, and the pin is loose. When the pin locking the sliding plate is not tightened, the surface pressure between the two sliding plates is small, resulting in looseness during casting, and molten steel is sprayed from the loose side to burn the mechanism; 2. The dilution and consistency of refractory mud during water distribution construction are not properly controlled. If the refractory mud is too thin, it will be extruded, which can not support the sliding plate brick . At the same time, it is not resistant to the scouring of molten steel, and it is easy to form steel at this position; If it is too thick, the refractory mud cannot be spread evenly. There is a gap between the upper nozzle brick and the sliding plate, and the molten steel will be drilled out of the gap. There is less mud between the upper water outlet brick and the upper sliding gate plate , the upper part of the upper sliding plate will lose suppo