Ladle-Shroud are two
main direction of development of the long nozzle:
(A) without SiO2 long nozzle developed. Of Al2O3-C qualitylong outlet usually contain a certain number of fused silica in order to improve the thermal shock resistance. However, due tothe SiO2 and MnO or FeO reaction to generate low-melting-pointmaterial, thereby reducing the anti-erosion and anti-erosion properties of the materials. Therefore, in casting high-manganese steel or high oxygen steel, developed the materialdoes not contain SiO2 Al2O3-C. Compared to traditional Al2O3-C materials, the thermal expansion coefficient of the material isrelatively large, must be precisely controlled warm-up conditions.In addition, the rational design of alumina particle size distributionor add ZrO2-Mo to the stone and the amount of low melting pointmaterials, improved material thermal shock resistance. Japan'sKawasaki Steel Chiba plant by increasing the aluminum carbonoutlet C and Al2O3 content, excluding the SiO2 and metalpowder, long nozzle, the average life expectancy has increasedto 10 times, up to 22 times.
(2) baking the package and a number of intermediate castingwith a long outlet. Such a long outlet usually contain more graphiteand a certain amount of fused silica material antioxidant and anti-erosion performance is poor, but it can save time and energy. The case of multi-tundish pouring, in order to extend the life of the outlet of the preheating temperature of at least 800 ℃.Domestic long nozzle aluminum carbon and fused quartz, the life of 4 to 6 furnace. Jointly developed by Wuhan Iron andsteelmaking and Luoyang Institute of Refractories Researchbaking long nozzle can be more than 7 furnace continuous casting, the casting time of not less than 5h. Three Wuhan Iron and steel-making by the head of the long nozzle material into adense type, intake changed along the ring sewn into the air, the formation of the chamber and each furnace in use to replace arefractory protection pad and through outsourcing steel, also has made good use of effects.
(A) without SiO2 long nozzle developed. Of Al2O3-C qualitylong outlet usually contain a certain number of fused silica in order to improve the thermal shock resistance. However, due tothe SiO2 and MnO or FeO reaction to generate low-melting-pointmaterial, thereby reducing the anti-erosion and anti-erosion properties of the materials. Therefore, in casting high-manganese steel or high oxygen steel, developed the materialdoes not contain SiO2 Al2O3-C. Compared to traditional Al2O3-C materials, the thermal expansion coefficient of the material isrelatively large, must be precisely controlled warm-up conditions.In addition, the rational design of alumina particle size distributionor add ZrO2-Mo to the stone and the amount of low melting pointmaterials, improved material thermal shock resistance. Japan'sKawasaki Steel Chiba plant by increasing the aluminum carbonoutlet C and Al2O3 content, excluding the SiO2 and metalpowder, long nozzle, the average life expectancy has increasedto 10 times, up to 22 times.
(2) baking the package and a number of intermediate castingwith a long outlet. Such a long outlet usually contain more graphiteand a certain amount of fused silica material antioxidant and anti-erosion performance is poor, but it can save time and energy. The case of multi-tundish pouring, in order to extend the life of the outlet of the preheating temperature of at least 800 ℃.Domestic long nozzle aluminum carbon and fused quartz, the life of 4 to 6 furnace. Jointly developed by Wuhan Iron andsteelmaking and Luoyang Institute of Refractories Researchbaking long nozzle can be more than 7 furnace continuous casting, the casting time of not less than 5h. Three Wuhan Iron and steel-making by the head of the long nozzle material into adense type, intake changed along the ring sewn into the air, the formation of the chamber and each furnace in use to replace arefractory protection pad and through outsourcing steel, also has made good use of effects.
read more:Ladle-Shroud for sale
from: Refractories
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