Manufacturing method for RH furnace circulating pipe
A manufacturing method and circulation pipe technology, which is applied in the field of refractory material manufacturing, can solve problems affecting the safety of RH refining equipment, accidents of circulation pipe piercing through steel, expanding steel penetration, etc., so as to improve the safety of use and avoid penetration of steel through brick joints , The effect of eliminating thermal expansion stress
Active Publication Date: 2014-02-12
BAOSHAN IRON & STEEL CO LTD
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AI Technical Summary
Problems solved by technology
During the RH refining treatment of this single brick assembly structure, under the dual effects of physical erosion and chemical erosion of the molten steel on the circulation pipe, the brick joints will expand and seep into the steel, and the first layer of ring bricks will be driven up by the molten steel, resulting in circulation. The pipe piercing steel accident seriously affected the safety of RH refining equipment and even caused production accidents
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1-3
[0025] The manufacturing of the RH furnace circulation tube by the integral casting process includes the following steps (see Table 1 for the specific process parameters in Examples 1-3):
[0026] (1) Make a pouring mold, and make a pouring mold according to the required size of the circulation pipe;
[0027] (2) Place the pouring mold on the vibrating platform, and pour castable into the pouring mold, the content of alumina in the castable is 45-96wt%, and the pouring process is reciprocated according to the following method until the pouring reaches the target height: Pouring 150mm per pass, continuously pouring 2 to 3 pieces of 150mm and then stopping for 15 to 45 minutes; the ambient temperature during pouring is controlled at 10 to 35°C, and the ambient humidity is controlled at 30 to 100%. It is any one of corundum spinel, high alumina spinel or magnesium spinel, the particle volume ratio of the castable is 40-70%, and the particle size is 3-50mm;
[0028] (3) demouldin...
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Abstract
The invention discloses a manufacturing method for an RH furnace circulating pipe. The method manufactures the RH furnace circulating pipe mainly through an integral casting molding. The manufacturing method comprises the following steps: (1) opening a casting mold; (2) placing the casting mold on a vibration platform and pouring a casting material containing 45 to 96 wt% of alumina into the casting mold to a target height according to the cyclic procedures of continuously casting 2 to 3 unit heights and stopping casting for 15 to 45 min, wherein one unit height is cast once, and ambient temperature and ambient humidity are respectively controlled to be 10 to 35 DEG C and 30 to 100% during casting; (3) carrying out demolding; and (4) carrying out maintenance, wherein ambient temperature and ambient humidity are respectively controlled to be 20 to 30 DEG C and 70 to 100%. The manufacturing method for the RH furnace circulating pipe is not restricted by height or diameter and allows a brick joint channel penetrated by molten steel not to appear, so an RH furnace is safe and reliable and has a stable service life.
Description
technical field [0001] The invention relates to a method for manufacturing a refractory material, in particular to a method for manufacturing a circulating pipe. Background technique [0002] At present, the existing RH furnace circulation pipes are all composed of brick monomers. These brick monomers (usually wedge-shaped) are assembled into brick rings through pre-assembly or on-site masonry combination, and then a complete set of circulation pipes is composed of several brick rings. Tube. [0003] The characteristic of this manufacturing method of the RH furnace circulation pipe is that: the individual bricks are separately molded and machine-pressed, and the individual bricks are combined to form the RH furnace circulation pipe. During the RH refining treatment of this single brick assembly structure, under the dual effects of physical erosion and chemical erosion of the molten steel on the circulation pipe, the brick joints will expand and seep into the steel, and the ...
Claims
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IPC IPC(8): C21C7/10C21C7/072
Inventor 赵明沈钟铭
Owner BAOSHAN IRON & STEEL CO LTD