wanhaorefractory

  In the past, magnesia-chrome bricks and high alumina bricks were mainly used for refining ladles as lining refractories for slag line parts and low-corrosion areas respectively. Considering the requirements of environmental protection, except for the vacuum deoxidized ladle, all chromium-free have been realized, and ladle magnesia carbon brick or magnesia-carbon-calcium brick is used as the refractory material for the lining of the slag line, and the molten steel is vacuum refined (Including refined low-carbon and super-carbon steel) The lining of the ladle slag line is made of low-carbon magnesia-carbon bricks. The choice of ladle magnesia carbon bricks or magnesia-carbon-calcium bricks for the refining ladle slag line mainly depends on the refined steel type, slag characteristics and operating conditions. The advantages of magnesia-carbon-calcium brick: The research results show that: in the CaO-SiO2 system slag (low alkalinity slag), the magnesia-c...

  Tundish nozzle clogging introduction: Clogging of the tundish nozzle is a major castability problem in continuous casting of steel for several reasons. Firstly, clogging increases the frequency of operation disruptions to change nozzles or tundishes or even to stop casting. These extra transitions increase operating cost, decrease productivity, and lower quality. Secondly, clogging can lead directly to a variety of quality problems. Clogs change the nozzle flow pattern and jet characteristics exiting the ports, which can disrupt flow in the mold, leading to surface defects in the steel product and even breakouts. Dislodged clogs also disturb the flow and either become trapped in the steel or change the flux composition, leading to defects in either case. Quality problems also arise from the mold level transients which occur as the flow control device compensates for the clogging. Clogging is a complex problem which has received a great deal of past study....

  1. Loose Wall The looseness of the tundish wall is mainly reflected in the contact position between the tundish wall and the bottom of the tundish. The looseness of the wall is manifested in two forms: one is that it extends longitudinally from the position of the wall to form an irregular surface; The other is that the elongated powder falls down to form a "slit shape". There are two reasons for the looseness: one is that the binder volatilizes, resulting in a decrease in the overall bonding strength, especially the outermost one; the other is that the fine powder containing resin does not wrap the particles, which eventually causes slag to fall off easily. The low-temperature baking strength and medium-temperature strength of the dry-type material can be better improved by mixing boron glass powder and phenolic resin in the magnesium dry-type material . Based on the site conditions, it was found that the reasons for the low quality of the tundish re...

  1. Applying the technology of exchangeable the sizing nozzle can avoid excessive casting speed and steel leakage accidents caused by excessive nozzle erosion. 2. Increase the number of single-ladle continuous casting furnaces, reduce excess steel in tundishes, improve slab yield and slab quality, and achieve the purpose of reducing costs and increasing benefits. 3. It can realize quick stop of pouring, re-starting of pouring and replacement of sizing nozzles with different apertures during the casting process, so as to adapt to the best matching of molten steel temperature, fluidity and casting speed in the later stage of casting, as well as the matching with the supply of molten steel in front of the furnace, and promote production organizational balance and stability. 4. Improve the service life of the tundish, reduce the consumption of tundish lining refractory materials, baking energy, and manpower for laying the tundish. However, the exchangeable syst...

  1. Optimizing the dry material composition and standardizing the fabric The continuous casting tundish plays an irreplaceable role, and the working layer of the tundish is the basis for protecting the normal and safe operation of the tundish. At present, the material of the tundish is magnesium dry material , and the uniformity of the cloth needs to be ensured, and the uniformity of the cloth of the working layer is the basis for the corrosion resistance of the refractory material. Therefore, starting from the operation, the following optimization schemes are proposed: (1) According to the research of Chen Changping, the strength of the working layer after demoulding is increased to meet the construction requirements, and the strength after high-temperature firing is reduced to meet the needs of disintegration of residual lining after offline. The amount of resin added in the dry material (w) is controlled at 1% to 3%; (2) The three sides of the ...

  1. The situation before switching Due to the history and production status and other reasons, the tundish working layer used in the production of Tanggang No. 2 Steel mill is mostly silicon plate, only one continuous casting machine uses part of magnesium coating, the average life of the tundish is only 6 ~ 7h, the operation rate of the continuous casting machine is only about 70%. Because the life of tundish is too low, and the amount of head and tail billet and tundish is too large, the consumption of steel material is too high, the average consumption of steel material is about 12kg. Moreover, due to the poor sintering effect and sintering strength of the silicon plate, the pollution of the silicon plate to the molten steel is too large, which can not meet the requirements of casting purity. 2. Use specific measures and effects (1) Improve and optimize the materials of the intermediate working layer Tundish working layer is the key point of tundis...

  Furnace repair is mainly the vulnerable parts in the EAF gunning furnace , which mainly includes: (1) Furnace wall slag line position The part of the lining in the steelmaking furnace that is close to the slag layer is called the slag line part of the lining because it is often in contact with the steelmaking slag. The slag contains calcium oxide (CaO), silicon dioxide (SiO2), ferrous oxide (FeO), calcium fluoride (CaF2), manganese oxide (MnO), aluminum oxide (Al2O3), etc. At high temperature, the acidic oxides in the slag react chemically with the basic furnace lining to form low-melting point compounds, which reduce the refractoriness of the furnace lining. Coupled with the physical scouring effect of the slag flow, the slag line of the furnace lining is severely damaged. The nearby slag line is more seriously damaged due to the high temperature radiation of the arc light. (2) Furnace wall hot spots The arc temperature reaches about 4000°C, and the area ...

  Tundish nozzles are an integral part of Continuous Steel Casting process. These products are instrumental in controlling the flow of Molten Steel from Tundish to Continuous Casting. Special features:Long casting sequence time. Ladle nozzle is a type of refractory products used in the process of non-stop casting of steel. They are part of the components of refractories to a steel casting slide gate. They are an integral replaceable part of the nest block. Both tundish nozzle and ladle nozzle are important components in the process of steelmaking, but they serve different purposes. A tundish is a refractory-lined vessel used in continuous casting of steel. It is located between the ladle and the mold and acts as a buffer between the two. The tundish receives the molten steel from the ladle and distributes it evenly into the mold through a series of nozzles or ports. The tundish helps to ensure a continuous flow of steel into the mold, which is essential for produc...

1.Why the error of big head and small head is allowed to be 1mm, the error of length is allowed to be 2mm, and the error of height is allowed to be 1%. Because the large and small head errors of 1 mm can be adjusted with refractory mortar , and the length error of 2 mm can be adjusted through the expansion cardboard and refractory mortar on the side of the brick. The height is allowed to be 1%, which is an expression. The refractory bricks used in the group kiln have three different heights: 200mm, 220mm, and 250mm. The error limit of bricks with different heights is different, but it cannot exceed 2-2.5mm. In general, we should control it at 1-1.5mm. This error can also be adjusted by fire clay. 2. Flatness: controlled at 0.5mm. Explanation: Use a feeler gauge to detect the flatness of the large brick surface. The commonly used feeler gauge specifications are 0.1, 0.2, 0.25, 0.3, 0.4, and 0.5. The maximum flatness of refractory bricks should not exceed 0.5mm....

  (1) The tundish dry material composition and distribution operation have an impact on the density and uniformity of the working layer of the tundish; the standard distribution operation can reduce the looseness and segregation of the dry material in the tundish . (2) Optimize the process, reduce the vibration time of the tundish from 15 minutes to 8 minutes, and extend the baking time from the original 2 hours to 3.5 hours, which improves the strength of the magnesium dry material during use. (3) Through the design of the special nozzle foam plug for repairing the tundish, the use effect of the upper nozzle of the tundish is guaranteed, and the problems such as steel slag blocking the eye caused by the irregular shape of the nozzle are solved. 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: Summary...

  1. The situation before switching Due to the history and production status and other reasons, the tundish working layer used in the production of Tanggang No. 2 Steel mill is mostly silicon plate, only one continuous casting machine uses part of magnesium coating, the average life of the tundish is only 6 ~ 7h, the operation rate of the continuous casting machine is only about 70%. Because the life of tundish is too low, and the amount of head and tail billet and tundish is too large, the consumption of steel material is too high, the average consumption of steel material is about 12kg. Moreover, due to the poor sintering effect and sintering strength of the silicon plate, the pollution of the silicon plate to the molten steel is too large, which can not meet the requirements of casting purity. 2. Use specific measures and effects (1) Improve and optimize the materials of the intermediate working layer Tundish working layer is the key point of tundish. When molt...

  1. Loose Wall The looseness of the tundish wall is mainly reflected in the contact position between the tundish wall and the bottom of the tundish. The looseness of the wall is manifested in two forms: one is that it extends longitudinally from the position of the wall to form an irregular surface; The other is that the elongated powder falls down to form a "slit shape". There are two reasons for the looseness: one is that the binder volatilizes, resulting in a decrease in the overall bonding strength, especially the outermost one; the other is that the fine powder containing resin does not wrap the particles, which eventually causes slag to fall off easily. The low-temperature baking strength and medium-temperature strength of the dry-type material can be better improved by mixing boron glass powder and phenolic resin in the magnesium dry-type material . Based on the site conditions, it was found that the reasons for the low quality of the tundish repair wer...

  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 volume stability at high temp...

  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, it also has th...

  1.First, thoroughly remove the steel slag, residual steel, steel and impurities infiltrated into the cracks on the repair surface. If the refractory material is pulverized by water, it should be completely removed until the refractory brick is exposed. 2.After the slag line is replaced, place the bottom of the EAF, hoist the ramming material into the EAF , and distribute the knotted material on the repaired surface as required to form a material layer with a height of about 150mm until it is covered with the repaired surface. 3.Distribute the material evenly, and use a special air vibration fork to poke each part of the material layer from the center of the molten pool to the EAF slope. 4.Repeat the operation twice until the EAF bottom ramming material is dense. Repeat the above steps until a suitable molten pool shape is formed. We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our hi...

  How to choose   insulating bricks   Insulation bricks used in thermal equipment can greatly reduce heat loss and furnace weight and improve thermal efficiency and labor productivity. For most thermal equipment, in order to save energy and improve working conditions, thermal insulation is necessary. However, for some equipment insulation is not necessary because of the pros and cons of thermal insulation. Therefore, the actual situation and the performance of thermal insulation bricks should be considered when selecting suitable thermal insulation bricks. The thermal insulation bricks can be divided into the following types: 1) Fireclay insulation brick GB/T 3994-2005 2) High alumina thermal insulation brick 3)   Mulite insulation brick We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality   refractory products   are good sold to many countries say South Africa, B...

  The EAF gunning material bears the same high temperature and harsh working environment as the repaired furnace lining during the smelting process. Therefore, in addition to high refractoriness, erosion resistance, erosion resistance, spalling resistance, etc., the EAF gunning mix must also be compatible with the repaired furnace lining. The lining has good adhesion. The gunning materials for electric furnaces include magnesia, magnesia-dolomite, magnesia-chromite, magnesia-carbon, magnesia-dolomite-carbon, etc., and some highly active seawater magnesia are used in the aggregate. To promote sintering and improve the density and strength of the gunning layer. In order to make the gunning material solidify quickly during the gunning operation and attach to the furnace lining at the same time, a small amount of additives are often added to the aggregate. 1.When adding Al, Mg and other low melting point metal powders for gunning, the oxidation heat of metal powder he...

  The magnitude of the impact of the Russian-Ukrainian conflict varies by region, depending on the region’s direct trade and financial exposure to Russia and Ukraine. The conflict had a direct and devastating impact on Ukraine, and the European Union was also affected to a certain extent due to its high dependence on Russian energy. Not only that, the impact of the Russian-Ukrainian conflict has also spread globally due to rising energy prices (especially the  refractory raw materials  needed for steel production), resulting in continued disruption of supply chains in some regions, a problem that has plagued the global steel industry even before the conflict broke out. The impact of the Russian-Ukrainian conflict continues to spill over, superimposed on the slowdown of China’s economic growth, the World Steel Association predicts that the growth of global steel demand in 2022 is expected to decrease. In addition, the continuous outbreak of the new crown pne...

  Globally, construction activity continues to recover from the COVID-19 lockdown in 2021, with steel demand up 3.4% year-on-year, despite a contraction in construction activity in China. In many countries and regions around the world, the impetus for this recovery comes from infrastructure investment. The World Steel Association believes that in the next few years, infrastructure investment and energy transition investment are likely to continue to drive the growth of steel demand in the construction industry. However, the construction industry is also facing some headwinds from high costs and interest rates. In addition, in the second half of 2021, bottlenecks in the automotive industry supply chain hindered the recovery of steel demand, and the recovery of the global automotive industry in 2021 was disappointing. Steel demand in the electric vehicle market has seen rapid growth during the COVID-19 pandemic, despite a slump in global auto production. In 2021, global...