assesment of slag infiltration into tundish
Enhanced slag resistance of magnesia refractory castables
Oct 15 2020 · 1. Introduction. Magnesia refractory castables are widely used in continuous casting tundish and cement rotary kilns owing to their high refractoriness and corrosion resistance against basic slag .However their low resistance to slag penetration weakens the service performances and the resultant service life in the above mentioned high-temperature industrial fields.
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Tundishnearby break out in slag line 25. Extreme wear of converter bottom 1600 heats 13. Submerged Entry Nozzlepremature damage Bricks and well blocks show high slag infiltration slag containing Fe2O3 up to 30 resp. 55 . slag line into the main body. The continuous casting campaign was stopped immediately.
Get PricePhosphorus Removal Mechanisms in Active Slag Filters
Apr 04 2007 · Phosphorus (P) removal mechanisms from waste stabilization pond effluent by a melter slag filter were investigated. The studied filter had treated pond effluent for a decade but lost its P removal efficiency after 5 years. The P distribution in the slag was examined by scanning electron microscopy (SEM) electron dispersive spectrometry (EDS) X-ray fluorescence (XRF) X-ray
Get PriceMetallurgical and Materials Transactions B Vol. 32B No
can make slag infiltration at the meniscus more difficult and thereby lead to surface defects such as longitudinal cracks. Finally as the buildup progresses the slide gate opening must be The top of the nozzle is attached to the tundish bottom and the outlet ports exit into the continuous casting mold. In this model the chosen slide
Get PriceAssessment of Tundish Process Performance at Industrial
In this work as pointed out already wt Al sol. VD has been taken to be equal to wt Al sol. entry Tun since beyond VD lifting bath is generally quiescent and a ladle is teemed into tundish within 5 to 10 min.During such period the composition of steel is not likely to change much since melt-slag mass transfer rates are expected to be rather slow.
Get PriceMetals Special Issue Mold and Tundish Metallurgy
These initial bubbles are further refined into small ones of 0.4 2.5 mm due to the turbulent flow in the pouring region. The cylindrical shield can effectively isolate the surface fluctuation caused by the short plunging jet thereby a stable slag layer in the tundish can
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For a more accurate assessment of the data presented in table 1 in figure 1 is shown in comparison the variation of the casting speed for this two sections simultaneous casted. not become so fluid that it is absorbed into the holes of the tundish as this would result in slag capable of absorbing non‐metallic inclusions from steel.
Get PriceTransient Interaction between Molten Iron Alumina Lining
steel and a MgO-based tundish refractory and reported that the reoxidation occured and the formation of an oxide layer on the refractory mainly composed of spinel crystals and of Ca-aluminates. 5 The different lining refractories have distinct reactions with the ste. et alindicated the steel infiltration into the refractory . el. Guo
Get PriceMetallurgical and Materials Transactions B Vol. 32B No
can make slag infiltration at the meniscus more difficult and thereby lead to surface defects such as longitudinal cracks. Finally as the buildup progresses the slide gate opening must be The top of the nozzle is attached to the tundish bottom and the outlet ports exit into the continuous casting mold. In this model the chosen slide
Get Price(PDF) 13KunzLADLE REFRACTORIES FOR CLEAN STEEL
As a result slag infiltration depth is reduced. Picture 14 shows the difference of the wetting angle of a slag drop on MgO and on Graphite. Graphite also fundamentally changes the brick properties such as Thermal Conductivity and Modulus of Rapture (Picture 15) Disadvantage of graphite addition and carbon bonding are the proneness to C-pickup
Get PriceElectromagnetic Effects on Solidification Defect Formation
Sep 03 2020 · Particle Capture Defects. Particles including argon gas bubbles injected to prevent nozzle clogging 28 entrained slag droplets due to abnormal high surface velocity and/or severe surface level fluctuations 29 30 and alumina inclusions flowing into the mold cavity from upstream processes such as ladle and tundish processes 31 may be entrapped by the solidifying steel shell as shown in Fig. 4.
Get PriceVol. 3 No. 5 Modeling of Continuous Casting Defects
gas injection into the tundish nozzle to avoid air aspi-ration is quantified by modeling. Computational the infiltration of liquid mold flux into the interfacial gap becomes more difficult which can surface may shear droplets of liquid mold slag into the flow where they may become entrained in the liquid steel.
Get PriceContinuous casting mould powder and casting process
slag chemistry during casting data on all casts were removed where ladle to tundish shrouding was a problem i.e. alumina pick-up and slag Fe 2O 3 increase. The Corus mould thermal monitoring (MTM) system is installed on the casters at the two plants. A general description of
Get PriceMetals Special Issue Mold and Tundish Metallurgy
These initial bubbles are further refined into small ones of 0.4 2.5 mm due to the turbulent flow in the pouring region. The cylindrical shield can effectively isolate the surface fluctuation caused by the short plunging jet thereby a stable slag layer in the tundish can
Get PriceCORROSION OF THE REFRACTORY ZIRCONIA METERING
infiltration of the molten steel and slag into the refrac-tory material the slag composition and the rapid tem-perature changes2. The chemical composition of the slag is based on the MgO-CaO-SiO 2-Al 2O 3 system but the proportion between the components depends on the type of the produced steel. In this paper the phase composition and microstruc-
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from ladle as well as tundish during teeming period 1-4 . Slag vortexing is the main cause of contamination of liquid steel during ladle drainage or ladle change over period in tundish 1 . To minimize slag vortexing many efforts have been made by modifying tundish furniture s over many decades as explored literary in few journals 1 2 .
Get PriceVol. 3 No. 5 Modeling of Continuous Casting Defects
gas injection into the tundish nozzle to avoid air aspi-ration is quantified by modeling. Computational the infiltration of liquid mold flux into the interfacial gap becomes more difficult which can surface may shear droplets of liquid mold slag into the flow where they may become entrained in the liquid steel.
Get PriceContinuous casting mould powder and casting process
slag chemistry during casting data on all casts were removed where ladle to tundish shrouding was a problem i.e. alumina pick-up and slag Fe 2O 3 increase. The Corus mould thermal monitoring (MTM) system is installed on the casters at the two plants. A general description of
Get PriceProduction and Quality Control of Clean Steel in Ansteel
The reasons of the inclusions formation and the liquid steel contaminated include the molten steel reoxidized by the air and oxidizing slag in the ladle the involvement and oxidation of the ladle slag in the tundish. These inclusions must float and be removed in tundish after going into the mould.
Get PriceGRADE MIXING ANALYSIS IN STEELMAKING TUNDISHUSING
complex interaction of physical chemical and thermal interactions among steel slag gas and refractory. In recent years researchers are seen focussing on multiphase hydrodynamic modeling of tundish system. In present work an assessment of RANS equations based standard k-ε RNG k-ε Realizable k-ε standard k-ω and
Get PriceRecovery of Metal from Slag in the Ferroalloy Industry
Effect of Slag Foaming and Lime Injection in Electric Arc Furnace on Steel Quality. Eissa Bench Scale Tests for the Assessment of Pneumatic Conveying Behaviour of Powders. Fargette C. / Jones Operation of the Vesuvius System 120 Tundish Nozzle Changer at Nucor Steel
Get PriceEvaluation of the protective C2S layer in the corrosion
Apr 01 2015 · Slag penetration dissolution and reaction of the doloma grains into the slag may then proceed directly and brick wear increases. The potential for corrosion always occurs when the vessel goes out of operation and is cooled down for a long period of time. When it is heats up again refractory corrosion may be severe. 4. Conclusions
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The slag drain is lined on three sides by the tundish refractory and on one side by cover refractory l7. Nozzle 23 is at the lowermost position when the tundish is in its horizontal or pouririg
Get PriceDesigning and Computational Modeling Study of Innovative
from ladle as well as tundish during teeming period 1-4 . Slag vortexing is the main cause of contamination of liquid steel during ladle drainage or ladle change over period in tundish 1 . To minimize slag vortexing many efforts have been made by modifying tundish furniture s over many decades as explored literary in few journals 1 2 .
Get PriceElectromagnetic Effects on Solidification Defect Formation
Sep 03 2020 · Particle Capture Defects. Particles including argon gas bubbles injected to prevent nozzle clogging 28 entrained slag droplets due to abnormal high surface velocity and/or severe surface level fluctuations 29 30 and alumina inclusions flowing into the mold cavity from upstream processes such as ladle and tundish processes 31 may be entrapped by the solidifying steel shell as shown in Fig. 4.
Get PriceContinuous castingWikipedia
In the tundish any inclusions that are less dense than the liquid metalgas bubbles other slag or oxides or undissolved alloysmay also float to the surface and be trapped in the slag layer.
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