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  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 kinds

  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 reta

  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 changing th

  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, the

  Lightweight refractories refer to refractory materials with low thermal conductivity and low heat capacity, also known as thermal insulation refractories. Lightweight refractories generally have a relatively high porosity and low bulk density, and are usually also referred to as insulating refractories. The closer the light refractory material is to the working surface, the better its thermal insulation effect. According to the different chemical mineral composition, lightweight refractories can be divided into alumina lightweight refractory materials, high alumina lightweight refractories, mullite lightweight refractories, siliceous lightweight refractories, and clay lightweight refractories Materials , vermiculite lightweight refractories and diatomite lightweight refractories; According to the use temperature, lightweight refractories can be divided into low-temperature lightweight refractories (use temperature <600℃), medium-temperature lightweight refractories

  The preparation method of ladle purging plug fireclay includes the following steps: Preparation of graphite uniformly dispersed slurry, preparation of CO grinding powder, vacuum mixing and vacuum packaging. The method for preparing anti permeability purging plug fireclay makes the fireclay with few bubbles and evenly disperses graphite powder which is not wetted by molten steel and steel slag, which makes it difficult for molten steel and steel slag to penetrate into the fireclay; Graphite powder makes the fireclay difficult to sinter, it is easy to remove when replacing the permeable brick, which can effectively avoid the cracking of the base brick and ensure the safety of molten steel refining. The raw material premixing device for chromium-free breathable brick fire mud for ladle includes a mixing bucket, a driving part arranged under the mixing bucket and a mixing shaft driven by the driving part, and a premixing channel is opened in the mixing shaft. The pre-mix

  Silicon nitride ceramics is a synthetic material. The covalent bond between silicon atoms and nitrogen atoms in its structure is strong, so it has high strength, high hardness, corrosion resistance, oxidation resistance, abrasion resistance, and good resistance. Thermal shock and other characteristics are considered by the material industry as an engineering ceramic material with excellent comprehensive performance and applicable to high temperature fields. Silicon nitride ceramics have good comprehensive properties and broad application prospects. For a long time, materials workers have been committed to developing the excellent properties of silicon nitride ceramics and continuously expanding their application fields. With the development of new technologies and the continuous deepening of theories, silicon nitride ceramics, as an engineering material with excellent performance, will surely get more rapid development and extensive applications. 1. The performance