Casting method of cast steel cooling wall

Abstract

The invention relates to a casting method of a cast steel cooling wall, which adopts a cast steel material to cast a steel brick body and a cooling water pipe. The casting method comprises the following steps: adding a slagging agent and a silicon iron alloy block in molten steel; putting the cooling water pipe into a casting model and leading a liquid cold medium and a composite solid cooling medium to pass through the cooling water pipe; using molten steel for casting steel to cast the steel brick body, and casting the middle part of the cooling water pipe into the steel brick body; leading the casting model to be horizontal in the process of casting, leading a feeder head to be modeled lopsidedly toward one side and heightening one side of the feeder head of the model after the model is boxed; adopting an upper layer of inner sprue and a lower layer of lower sprue to carry out stepped casting so as to form sequential solidification; and cooling and disassembling the model. The casting method can effectively avoid the cooling water pipe from being penetrated in a fusing manner during the casting process, avoids air gaps from being generated between the steel brick body and the cooling water pipe, avoids remelting and recrystallization, accurately realizes the microfusion of the outer surface of the cooling water pipe, prolongs the service life of the cooling wall, further prolongs the service life of a metallurgical high-temperature kiln, saves production cost and improves the cooling effect and mechanical performance of the steel brick body.

Description

technical field [0001] The invention relates to a metallurgical high-temperature furnace, in particular to a casting method for a cast steel cooling wall of a metallurgical high-temperature furnace, belonging to the technical field of metallurgy and ironmaking. Background technique [0002] The stave is a cooling equipment for metallurgical high-temperature furnaces, which can protect metallurgical high-temperature furnaces from erosion and mechanical wear of high-temperature fluids in the furnace, prolong the life of metallurgical high-temperature furnaces, and ensure their safe and stable production. Once there is a problem with the cooling equipment, the metallurgical high-temperature furnace must be completely shut down for maintenance, which will cause major economic losses. Therefore, the service life and performance of the stave determine the service life of the metallurgical high-temperature furnace, which is an important guarantee for the long life, high efficiency ...

AI Technical Summary

Problems solved by technology

Taking the most widely used ductile iron stave as an example, it has the following disadvantages: (1) The nodular cast iron stave must be equipped with an anti-carburization coating outside the cooling channel, so that an air gap is formed between the channel and the substrate, and the air gap makes The heat transfer resistance of the cooling wall increases significantly, which deteriorates the heat transfer effect of the cooling wall, increases the temperature of the working surface of the cooling wall, and accelerates the damage of the cooling wall; mm), spherical graphite is equivalent to forming countless tiny holes after being oxidized, which constitutes the birthplace of cracks and cracks, which accelerates the expansion of cracks and cracks, resulting in shortened service life of cooling walls and increased resource consumption, which is not conducive to Long life stave and energy saving; (3) When casting large ductile graphite castings, C, S, and P are easily pushed to the liquid region during the columnar crystallization process, forming a segregation-enriched region in the central equiaxed crystal region, making the surface of the casting There is a large difference in elongation from the center, and the surface elongation is more than twice that of the center, which promotes the generation and expansion of cracks or cracks in ductile iron, which is not conducive to the longevity of the stave; (4) The linear expansion coefficient of ductile iron is 600 °C The following changes are relatively stable, but above 600°C, a sharp irreversible "growth" will occur with the increase of temperature. When the temperature is greater than 709°C, the matrix structure undergoes phase transformation, the expansion coefficient and internal stress increase sharply, and the damage speed is accelerated. (5) The thermal conductivity and thermal shock resistance of ductile iron are poor, and its thermal conductivity is only 30w m -2 ·K -1 , which is not conducive to efficient cooling of the stave

Simply considering it from a certain angle cannot solve the problem very well, and it needs to conduct systematic research on the basic principles of interdisciplinary and multidisciplinary

Due to the above limitations, the current application of cast steel on staves still cannot meet the requirements of industrial applications

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