This kit includes 5 xb tactical piercing clamp to stacking shrouded banana plug test leads, 5 xr minihook to stacking shrouded banana plug test leads, and 2 shrouded rightangle to stacking shrouded rightangle banana plug test leads. The effect of a dissipative ladle shroud on mixing. Csr ls is our new stateoftheart ladle shroud technology. The overall setup is generic, in that a ladle sits on a rotating turret or swing tower, and empties liquid steel into a tundish set below via a protective ladle shroud or tube. A physical model study of twophase gasliquid flows in a ladle. Other products include starter bar, torpedo car and ladle backup lining, and covers of various shapes and sizes. An innovative new pouring design for steel castings.
When the ladle is in position, the shroud is mechanically lifted so there is a seal between the nozzle and the shroud. And a slide gate was made of al 2o 3c bricks, and the bricks at the upper nozzles were highal 2o 3. Figure 1, reproduced from a recent study, 9 depicts a schematic of molten steel transfer from a ladle to a tundish via a shroud. To protect the steel stream from reoxidation between the ladle and tundish. A shroud is positioned in the mould, the bottom of the shroud protrudes into a filter box located at the base of the mould. The shroud holder ladle part is mounted on each ladle. Control of gas bubbles and slag layer in a ladle furnace by electromagnetic stirring. Jul 02, 2019 pdf as seen from the above, shroud misalignment with an exposed ladle shroud can be catastrophic in terms of transient steel quality to the. Steelmaking and remelting technologies your key to high. The major roles of the ladle shroud and gaskets are. Published under licence by iop publishing ltd iop conference series. In paper was examined four immersion depth of ladle shroud in liquid steel. Mathematical modelling of fluid flow inside trumpetshaped ladle. In this stage, the nozzle filling sand performance is fundamental hitech wellmix, providing the instantaneous steel pouring to the tundish, without the need to use oxygen.
The simulation was performed for sequence of slabs casting. The shroud manipulator is available as manual type controlled by the operator. Seppo louhenkilpi, in treatise on process metallurgy. You can use them for cold start and hot start, and also continuous and intermittent use. This result flew in the face of many expectations of authenticity but was welcomed by many as revealing the shroud to be simply inauthentic. These roles are essential for most of steel grades and steel applications. Different cases have been analyzed, including a conventional ladle shroud ls with a bare tundish and a tundish furnished with an impact pad. Return to article details intensification of liquid steel active flow volume in onestrand tundish using a modified ladle shroud download download pdf. Us4836508a ladle shroud with copressed gas permeable ring. Modelling and validation of fluid flow inside a dissipative ladle shroud and a continuous casting tundish. This tundish is used to distribute metal to one, two, four, six, or even eight, oscillating molds, set below.
An interesting approach was recently studied by moraleshiga et al. Steel making is the next fundamental process after iron melting. Physical system the ladle system simulated in this paper is shown in figure 2. Chosun offers several kinds of ladle shroud as a countermeasure of air infiltration.
Ladle shroud is a small but significant device in tundish metallurgy to facilitate both production process and steel quality. The shielding effect is used to protect the steel from air contact. A slide gate was used to control the flow rate of liquid hno poured from a ladle. To further the study of the effect of ladle shrouds on mixing in a tundish. Oct 23, 2012 the new design for a dissipative ladle shroud dls was studied, using a onethird scale, delta shaped, fourstrand tundish.
Refractory vessels of various types are used in the melt shop or steel making area to hold molten iron or steel, known as hot metal. Due to the continuous path control, all movements are executed and completed in the shortest possible time. The main functions of the tundish are to be a steel reservoir between the ladle and the mold, and in the case of multistrand casters to distribute the liquid into the molds. Saac system for ladle shroud shielding 1 functional description the saac system provides shielding gas to the ladle shroud gasket. For this purpose a ladle shroud which is flushed with argon is located between. The mstmv2 is a compact design, automatic ladle shroud manipulator with all axes of the machine powered. The dense body of the ladle shroud and the copressed porous ring are of similar carbonbonded graphite refractory grain compositions and have similar carbon containing binder. Pdf advances in ladle shroud as a functional device in tundish. Pdf as seen from the above, shroud misalignment with an exposed ladle shroud can be catastrophic in terms of transient steel quality to the. The shroud is a tube like attachment onto the nozzle of the bottom pour ladle that. The effect of calculations were a residence time distribution curves rtd, type f. A new design of ladle shroud was developed and studied in a onethird scale water model. The effect of a dissipative ladle shroud on mixing in tundish.
Pdf ladle shroud as a flow control device for tundish operations. Ladle shrouds, with a standard oxidation protection liner at the cnt area, are designed to function without preheating. It was assumed that the ladle shroud inside from 200mm below the top to the lower edge was immediately. Nov 19, 2015 the aim research work is to study a new ladle shroud concept and design to assist in the reduction of slag emulsification in the tundish during ladle change. Change of production route asia electric arc furnace 50 t ladle furnace aod ccm sq. The results were compared with those achieved with the standard ladle shroud. Liquirob brings it to the ladle, and shroud holder and shroud holder ladle part. Us20110248055a1 ladle shroud for liquid metal casting. Apr 28, 2019 celebre2000 automated and manual driven designed and manufactured by. An innovative new pouring design for steel castings justin daniel walker iowa state university follow this and additional works at. Ladle shroud is a small but significant device in tundish metallurgy to facilitate both. Ladle shrouds as flow control devices for tundish operations.
Then the fully automatic shroud manipulator is the first choice. It typically has 3 pins that are used as mechanical connection to the moveable shroud holder figure 1. Past decades have witnessed its evolution from a simply shrouding tube to a multifunctional device in continuous casting processes. To introduce the steel into the tundish with minimum risk of tundish powder entrapment. Vof based prediction of twophase flow phenomena in the two ladle shroud systems.
Swirling ladle shroud a new generation flow control device was. The machine can perform preprogrammed tasks with single button operation and consists of the following main components. Long nozzle with bell type shroud and trumpet shaped shroud as embodied in figure 2 c have been used by few steelmaking industry to decrease reoxidation and nucleation of detrimental macro inclusions 3,9. Ladle shroud as a flow control device for tundish operations. The dense body of the ladle shroud and the copressed porous ring are of similar carbonbonded graphite refractory grain compositions and have similar carbon containing binder systems to improve the bond between the ring and body. Oxygen from ambient air may cause unwanted oxidic inclusions. Hollotex shroud is a new process that can be effectively applied in steel foundries.
J zhang 1, q liu 1, z xin 1, b lu 2, j zhang 2 and j li 2. Us4836508a ladle shroud with copressed gas permeable. Before hot metal is introduced to these vessels, the vessel must be preheated. Effect of a swirling ladle shroud on fluid flow and mass. Featuring an industrial robot controller the machine allows teaching of all required ladle shroud maneuvers and executing them triggered by the caster control system. A longhandled spoon with a deep bowl for serving liquids. In addition to being a reservoir of liquid steel, the tundish.
Ezhook ezhook wire attack kits designed for eod ezhook 3527 wire attack kit is designed for eod technicians. Historical viewer has analytical reporting features for automatic calculation of operator reaction times, minimum tundish weight, number of slide gate moves, and even the quality of the ladle shroud seal. Materials science and engineering, volume 668, number 1. This is carried out in steel melting shops sms of a steel plant. Download fulltext pdf download fulltext pdf download fulltext pdf numerical modelling of dissipation phenomena in a new ladle shroud for fluidynamic control and its effect on inclusions removal. Advances in ladle shroud as a functional device in tundish metallurgy.
Designing and computational modeling study of innovative. Ladle shroud gaskets are available in ceramic fiber, black clay gaskets and a combination of the two. Pdf advances in ladle shroud as a functional device in. Pdf ladle shroud as a flow control device for tundish. These approaches were used to study the performance of fluid flow for a new design of ladle shroud. The quality obtained in the steel produced through the continuous casting process begins with the opening of the ladle to transfer the steel into the tundish. This article presents the results of computer simulation of the flow of liquid steel through onestrand tundish.
View of intensification of liquid steel active flow volume in onestrand. Oct 18, 2018 a ladle shroud is fixed to a coupling device for reversibly coupling an inlet orifice of said ladle shroud to a collector nozzle fixed to the outside of a bottom floor of a ladle in a metal casting installation, by means of at least a first and second elongated latch pivotally mounted on a hinge, such that the latch can pivot from a fixing position to an idle position. Free preheating ladle shroud free preheating ladle shroud is a effective protection channel for steel liquid from ladle to tundish. When the carbon 14 c14 dating of the shroud of turin result was announced in 1988, the tests concluded that the shroud was woven of flax whose age was estimated to be between 1260 and 90 a.
About air sealing at the ladle shroud,the right side chart shows how much you can reduce n2 pick up into steel. Based on the distribution curves range of the transition zone. Long servicelife ladle shroud shinagawa have developed long servicelife ladle shroud. Ladle shrouds are used to connect the ladle and the tundish, they have the function that stable the steel slow state, prevent the steel liquid oxidated and splash, also they have the advantage of good thermal shock and slag resistance, conveniently operation, so that improve the woking environment. It is consisted of silicafree body material outside with superior erosion resistance and carbonfree liner inside with good spalling resistance. Advances in ladle shroud as a functional device in tundish.
Through design and mix selection, this product is capable of servicing both longlife and single use applications. It consisted of an ag material body and carbonfree inner liner. This product uses a high performance low conductivity. The dimensions were 1,000mm in length and 35mm in thickness. Argonsteel flows inside a ladle shroud during teeming from a ladle to a tundish have been modelled physically. Modeling study of slag emulsification during ladle change. The present invention relates to a ladle shroud 10 for casting liquid metal, comprising a canal 11 along which the metal can pass, extending essentially along an axis, and a metallic jacket 17 positioned at an end portion of the shroud that corresponds to an end of the canal, characterized in that the jacket 17 comprises at least a belt 18 of a thickness greater than or. Pdf numerical modelling of dissipation phenomena in a. The dimension of the slide nozzle system and the shroud system under a ladle in this research could be seen in figure 1. An innovative new pouring design for steel castings by. Control of gas bubbles and slag layer in a ladle furnace.
Pr351147 2007 aistech conference proceedings fluid flow effect on inclusion removal in a tundish with a swirling ladle shroud. In 1984, the refractories research group at armco started to investigate and develop test procedures to evaluate ladle sands be fore they were tried in the field. This appears to suggest that many discrete gas bubbles form inside a shroud to result predominantly in a bubbly liquid flow with, more or less, unisize bubbles distributed over the entire length of the immersed shroud. For this, a tundish analogue water model is designed and constructed based on froude similarity criterion.
The molten iron is carried from the casthouse by means of transfer ladle and is then discharged into a furnace for purification and further processing. Ladle shroud honsin group supplies different categories ladle shroud such as. Pdf ladle shroud is a small but significant device in tundish metallurgy to facilitate both production process and. There is a range of main body material choice depending on the steel composition. Shroud for casting metal from a ladle, said nozzle comprising. Different positions of the porous plug have been studied. Pr055059 1996 steelmaking proceedings ladle shroud slag detector.
Ambient air may cause also nitrogen enrichment, which may have a negative influence on. The new dissipative ladle shroud dls was studied, using a one third scale, delta shaped, fourstrand tundish. Our product range isostatic refractories so static. In particular, it is important to use a submerged ladle shroud preferably bell. Experimental residence time distribution curves, using the swirling ladle shroud and. If needed, then slagline protection can be provided. This coldstart functionality is guaranteed by a special antispalling liner. The new design for a dissipative ladle shroud dls was studied.
Trumpetshaped ladle shroud tls has been widely employed in practical continuous casting processes. Shrouded transfer of molten steel from ladle to tundish. The vesuvius ladle shroud is a ceramic tube manufactured from isostatically pressed alumina graphite custom designed for immediate connection to the ladle slide gate nozzle giving maximum protection of the steel stream against oxidation from the atmosphere and minimizing steel splashing. The first item is of special importance during ladle change. Failure to comply may result in severe personal injury andor equipment damage. The results were compared with those achieved with the conventional ladle shroud. A ladle shroud has a copressed porous ring for the introduction of an inert gas at the sealing joint between the ladle shroud and a mating ladle collector nozzle.349 198 249 906 13 581 1312 627 1397 1123 1223 448 1381 167 968 1290 1025 547 283 778 1529 73 373 1039 1460 1297 735 1386 55 1202 1173 815 691 644 1472