Performance of steel grades sensitive for clogging entry nozzle (sen) during continuous casting of ce-treated steels, jennie ks continuous casting of. Introduction this paper shows the results of a research project that aimed to find reasons for nozzle clogging in the submerged entry nozzle in continuous casting of steel, and also to develop tools for predicting the occurrence of this phenomenon. Continuous casting of low carbon low silicon steel processed though basic oxygen furnace (bof) followed by online purging station (olp) and ladle furnace (lf) inherently suffers from the problem of clogging of submerged entry nozzles (sen) during casting due to gradual alumina deposition at the inner surface of the refractory wall. Changing casting speed if the need arises or for changing the nozzle if erosion, cracking or clogging occurs open casting means no steel jet protection during transfer from ladle to tundish and from tundish to molds, with an exception.
The clogging of submerged entry nozzles (sens) and tundish well nozzles is a common problem in the continuous casting of aluminum-killed steels clogging occurs when alumina attaches to. Nozzle clogging is a serious productivity and qua lity problem in continuous casting this work reviews the causes, effects, and solutions to cloggi ng in continuous casting nozzles the results. Abstract: nozzle clogging during steel pouring and continuous casting process is a long-standing problem for al-killed steels the pouring flow rate through the nozzle often decreases due to nozzle clogging, which then can lead to serious operational problems. In the continuous casting machines of steel, the clogging of the submerged entry nozzle (sen) is a common problem that affects the quality of a product the gradual increase in the clogging volume produces inadequate and uneven flow patterns.
Thermo-mechanical model of steel continuous casting process r oficjalski, l zalewski, prevention of nozzle clogging in the process of continuous steel casting. Disturbances estimation for mold level control in the continuous casting process steel entering the nozzle the second form is related given nozzle clog is. Figure 3—inclusion compositions in steel of two different heats (5974 and 6041), as sampled at three different stages of the continuous casting process, namely in the ladle furnace after calcium treatment, in the tundish, and after solidification in the billet. Pre-treatment nozzles the ah series of full cone nozzles is commonly used in the steel industry in the continuous casting process, but can be adapted to other. Clogging of the nozzles used for the continuous casting of steel results in decreased caster efficiency and decreased product quality a literature review has revealed that nozzle.
Nozzle clogging is a common problem in the production of continuously cast al-killed steels clogging occurs when there are solid inclusions in molten steel at casting temperatures sens (submerged entry nozzles) from continuous casting of al-killed low alloy steel grades with increased content of sulfur (0,020 to 0,035 % s) were examined. Products include air atomizing nozzles, flat fan nozzles, hollow cone nozzles, full cone nozzles, tank washing nozzles, steel industry nozzles & accessories, secondary cooling in continuous casting machines, single fluid nozzles, twin fluid nozzles, rolling mill technology, roll cooling nozzles, roll cooling systems, hydromechanical descaling. Published: wed, 13 dec 2017 prevention of nozzle clogging in the continuous casting of steel there have been four documented causes for nozzle clogging in continuous casting steels build up de-oxidations such as al2o3 (1), solid steel build up, buildup of complex oxides such as spinels, and the buildup of reaction products such as cas (4. Content of steel liquid, irrelevant refining slag system and excessive calcium treatment the nozzle clogging was steel in continuous casting billet mold. The invention is related to a continuous casting nozzle for casting of aluminum killed steel without clogging of the bore of the nozzle the surface layer of the bore of the continuous casting nozzle contacting with the molten steel is formed of a refractory comprising graphite from 10 to 35 wt %, an aggregate of 10 to 60 wt % selected from alumina matter, zirconia matter, zircon matter, or.
Simulation studies of nozzle clogging for continuous casting of steel, kd peaslee and jd smith, proc of the 38th annual meeting of the st louis section of the american ceramic society, chesterfield, mo, march 21, 2002. A molten steel pouring nozzle having a bore therethrough, at least a portion of the nozzle forming the bore being comprised of a refractory having calcium zirconate: from 20 to 75 weight %, graphite. Development of high-efficiency continuous casting technologies prevention of nozzle clogging when casting high-strength steel, the solidified shell. A major advantage of this practice is that nozzle clogging during the continuous casting of liquid steel is eliminated since solid al2o3 inclusions are transformed to liquid calcium aluminates which do not clog the nozzle.
Modeling of continuous-casting defects related to mold fluid flow continuous casting, submerged entry nozzle, mold flow, gas injection, air aspiration, level. Lecture 33 continuous casting of steel in presence of flux through the submerged nozzle immersed in the liquid steel • prevention of oxidation. On the cause and prevention of tundish nozzle clogging on the cause and prevention of tundish nozzle clogging caley , , wf 2006-06-01 00:00:00 the formation of accretions or clogging of tundish nozzles in the continuous casting of steel is detrimental both to caster productivity and to eventual inclusion content of the final product.
This phenomenon was different from the frequent occurrence of clogging in the tundish nozzle in the continuous casting process the clogged ladle nozzles were. In both cases, nozzle clogging can occur during continuous casting at what temperatures, o- and ca- contents can a steel with a given al- and s- content be cast without nozzle clogging.
Influence of the chemical composition on steel casting performance due to the risk of nozzle clogging at the continuous treatment allows continuous casting of. Metalurgija 54 (2015) 2, 371-374 371 f tehovnik, j burja, b arh, m knap submerged entry nozzle clogging during continuous casting of al-killed steel. Nozzle expert - early detection of nozzle clogging nozzle expert helps to detect clogged nozzles and broken hoses in continuous casting machines and consequently ensures that the strand is uniformly cooled for high-quality steel production.