22
2019
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08
Material of steel ladle permeable bricks
Source： Science and Technology Innovation Materials
Release time：2019-08-22 15:45
The use of porous plugs in steel ladles allows for bottom-blown argon to purge gases and solid impurities from the molten steel, achieving uniform composition and temperature. The importance of this is self-evident. The material of the porous plug determines its characteristics. To achieve the goal of bottom-blown argon, the porous plug needs to possess thermal stability, erosion resistance, corrosion resistance, permeability resistance, operational safety, good gas permeability, and minimal molten steel penetration.
Bottom-blown argon gas in ladle porous bricks can purge gases and solid impurities from molten steel, achieving uniform steel composition and temperature. Its importance is self-evident. The material of the ladle porous brick determines its characteristics. To achieve the purpose of bottom-blown argon gas in ladle porous bricks, the ladle porous brick needs to possess thermal stability, erosion resistance, corrosion resistance, and permeability resistance, as well as operational safety, good air permeability, and minimal steel penetration. the ladle porous brick needs to possess thermal stability, erosion resistance, corrosion resistance, and permeability resistance, as well as operational safety, good air permeability, and minimal steel penetration.
(Image) Anti Permeation Brick
Magnesite: Magnesite materials refer to refractory materials with MgO content above 80%. Magnesite products are mostly produced by sintering, with a firing temperature generally between 1500 and 1800℃. They have advantages such as high refractoriness, strong resistance to slag erosion, and no steel contamination; however, they have a large coefficient of thermal expansion and poor thermal shock resistance, leading to easy material spalling, which greatly reduces the service life.
Magnesiochromite: Magnesiochromite materials are refractory materials mainly composed of MgO and Cr2O3. When in contact with molten metal, they not only have a good effect against alkaline slag but also have the characteristics of solid-phase sintering, which can effectively prevent molten metal penetration. However, during high-temperature preparation and use, it will produce harmful hexavalent chromium compounds, causing environmental pollution. With increasing emphasis on environmental protection, the production of magnesiochromite materials will decline.
High-alumina: High-alumina materials refer to refractory materials with Al2O3 content above 48%~75%, which have high cold and hot strength, thermal shock resistance, and compressive strength, but poor permeability.
(Image) Corundum Porous Brick
Corundum: Corundum materials refer to refractory materials with Al2O3 content above 90%. The main crystalline phase is α-Al₂O₃ (corundum) refractory material. Adding Cr2O3 to the material can inhibit the excessive growth of aluminum oxide crystals, thereby reducing the internal stress of the crystals and enhancing the physical properties of the material. However, if too much Cr2O3 is added, the growth rate of corundum grains is seriously affected, and the physical properties of the material will decrease. Also, from an environmental perspective, the introduction of Cr2O3 will pollute the environment, so the introduction of Cr2O3 should be carefully considered.
Ke Chuang New Materials produces a variety of porous bricks with rich experience and superb technology, a professional manufacturer worthy of trust! Luoyang Ke Chuang New Materials Co., Ltd., focusing on the R&D, production, and sales of porous bricks for 22 years, is a professional porous brick manufacturer. Welcome to inquire.
Source: Luoyang Ke Chuang New Materials Co., Ltd.: https://www.kcnh.com/
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