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 continuo...

  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 Sou...

 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 i...

  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...

  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) P...

  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 func...

  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 hig...