Nozzle clogging prediction in steel casting.pdf Casting
NOZZLE CLOGGING PREDICTION IN CONTINUOUS CASTING OF STEEL. Jouni Ikäheimonen1 Kauko Leiviskä1 Jari Ruuska1 Jarkko Matkala2. 1 University of Oulu Control Engineering Laboratory Oulu Finland 2 Rautaruukki Steel Raahe Finland. Abstract Submerged entry nozzle connects the tundish and the mold in the continuous casting of steel.
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Kinetic Modeling of Nonmetallic Inclusions Behavior in
Oct 14 2020 · The kinetic modeling for the nucleation size growth and compositional evolution of nonmetallic inclusions in steel was extensively reviewed in the present article. The nucleation and initial growth of inclusion in molten steel during deoxidation as well as the collision growth motion removal and entrapment of inclusions in the molten steel in continuous casting (CC) tundish and strand
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Electromagnetic 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
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Effects of operating parameters on the flow field in slab
Nov 11 2019 · Ar gas injection plays an important role in the removal of inclusions slag entrapment and nozzle clogging thus it has a great impact on slab surface quality. Fig. 7 compares the measured and calculated subsurface velocities obtained at different Ar gas flow rates a casting speed of 1.7 m∙min −1 and SEN immersion depth of 170 mm in a
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Indian Patents. 230180 A PROCESS FOR CONTINUOUS CASTING
The invention relates to a process for continuous casting of aluminium killed steel without causing nozzle clogging in 100 mm X 100 mm billet caster. More particularly the present invention relates to a process of continuous casting of billet with significantly high
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Controlling Nozzle Clogging by Secondary Steelmaking
The inter-related effects of nozzle clogging argon injection tundish bath depth slide gate opening position and nozzle bore diameter on the flow rate and pressure in tundish nozzles are
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Effects of Clogging Argon Injection and Casting
Argon injection into the nozzle is widely employed to reduce nozzle clogging. Both clogging and argon injection greatly affect flow through the nozzle altering both the flow rate and flow symmetry. In many slab casting operations the slide-gate opening is adjusted to compensate for these changes and maintain a constant flow rate.
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Clogging of submersible nozzles in continuous slab-casting
Buildup in the inner cavity of submersible nozzles significantly reduces the channel cross section with drop in the casting rate and eventually shutdown of the continuous-casting machine. Such buildup entails replacement of the nozzles. The clogging of submersible nozzles is found to be associated with the deposition of products from the reduction and secondary oxidation of the steel
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Clogging of submersible nozzles in continuous slab-casting
Buildup in the inner cavity of submersible nozzles significantly reduces the channel cross section with drop in the casting rate and eventually shutdown of the continuous-casting machine. Such buildup entails replacement of the nozzles. The clogging of submersible nozzles is found to be associated with the deposition of products from the reduction and secondary oxidation of the steel
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JPAContinuous casting method of cast slab
PROBLEM TO BE SOLVED To produce a slab of excellent quality by suppressing argon gas bubbles in molten steel from being trapped in a solidified shell in a simple and inexpensive manner and preventing surface defects. Provided is a continuous casting method of a cast piece with less air bubble defects which can also improve the quality of a steel material obtained by rolling a piece and a
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Behavior of Argon Bubbles during Continuous Casting
Water model experiments mathematical models and plant data are analyzed to understand the behavior of argon bubbles during continuous casting of steel. Highspeed video pictures reveal how argon acts to protect the nozzle wall from alumina inclusions and clogging. Mathematical models reveal the importance of inclusion attachment to moving argon bubbles as a means of inclusion removal into
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Indian Patents. 230180 A PROCESS FOR CONTINUOUS CASTING
The invention relates to a process for continuous casting of aluminium killed steel without causing nozzle clogging in 100 mm X 100 mm billet caster. More particularly the present invention relates to a process of continuous casting of billet with significantly high
Get Price
Indian Patents. 230180 A PROCESS FOR CONTINUOUS CASTING
The invention relates to a process for continuous casting of aluminium killed steel without causing nozzle clogging in 100 mm X 100 mm billet caster. More particularly the present invention relates to a process of continuous casting of billet with significantly high
Get Price
Physical Modeling of Asymmetrical Flow in Slab Continuous
The inter-related effects of nozzle clogging argon injection tundish bath depth slide-gate opening position and nozzle-bore diameter on the steel flow rate and pressure in continuous-casting
Get PriceBehavior of Argon Bubbles during Continuous Casting
Water model experiments mathematical models and plant data are analyzed to understand the behavior of argon bubbles during continuous casting of steel. Highspeed video pictures reveal how argon acts to protect the nozzle wall from alumina inclusions and clogging. Mathematical models reveal the importance of inclusion attachment to moving argon bubbles as a means of inclusion removal into
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USATundishGoogle Patents
An improved tundish is disclosed for use in combination with a casting ladle and a casting mold to continuously cast metal slabs. This tundish comprises an elongated flat-bottomed basin known as a flotation box in between a pouring box with a vertical partition and an antivortex box. A first recess is provided in the bottom of the basin just under the partition to prevent any slag formed
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Effects of operating parameters on the flow field in slab
Nov 11 2019 · Ar gas injection plays an important role in the removal of inclusions slag entrapment and nozzle clogging thus it has a great impact on slab surface quality. Fig. 7 compares the measured and calculated subsurface velocities obtained at different Ar gas flow rates a casting speed of 1.7 m∙min −1 and SEN immersion depth of 170 mm in a
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Vol. 3 No. 5 Modeling of Continuous Casting Defects
clogging.23The addition of argon gas can replace air in feeding leaks around seals. Argon injection can also raise the minimum pressure in the nozzle above ambi- ent.15Note that this occurs because the slidegate must open up to accommodate the gas (shown in the top of Figure 5) in addition to the pressurizing effect of the gas.
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CiteSeerX — Effect of Clogging Argon Injection and
Abstract. The inter-related effects of nozzle clogging argon injection tundish bath depth slide gate opening position and nozzle bore diameter on the flow rate and pressure in tundish nozzles are quantified using three-dimensional multiphase turbulent numerical fluid flow models.
Get PricePreventing air aspiration in slide gate plate throttling
Another persistent problem is the clogging of the nozzle below the graphite injection groove (e.g. the submerged entry nozzle). Such clogging requires occasional "rodding" by workers in which a long rod is rammed through the molten metal passageway to break up deposits of refractory therein.
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
Get PriceEffects of operating parameters on the flow field in slab
Nov 11 2019 · Ar gas injection plays an important role in the removal of inclusions slag entrapment and nozzle clogging thus it has a great impact on slab surface quality. Fig. 7 compares the measured and calculated subsurface velocities obtained at different Ar gas flow rates a casting speed of 1.7 m∙min −1 and SEN immersion depth of 170 mm in a
Get PricePhysical Modeling of Asymmetrical Flow in Slab Continuous
The inter-related effects of nozzle clogging argon injection tundish bath depth slide-gate opening position and nozzle-bore diameter on the steel flow rate and pressure in continuous-casting
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Numerical and Physical Study on a Cylindrical Tundish
A new tundish design was investigated using both water model experiments and numerical simulations. The results show that the Reynolds Stress Model simulation results agree well with the Particle Image Velocimetry-measured results for water model experiments. A strong swirling flow in the Submerged Entry Nozzle (SEN) of the new tundish was successfully obtained and the tangential velocity in
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Mathematical Modeling of Multiphase Flow in Steel
In continuous casting of steel multiphase flow arises in many different ways. 1) Argon gas is often injected into the molten steel usually through the upper tundish nozzle walls 2 3) or stopper rod tip. 4) This is beneficial to avoid clogging 5) and air aspiration. 6) However argon bubbles affect the flow pattern in the mold 7 8 9 10 11 12) and can lead to the capture of small bubbles by
Get PriceInvestigation of transverse depression formation during
By experimenting with various nozzle configurations they noted that the nature of the tundish streams was influenced by nozzle configuration and that stable streams which are unaffected by turbulence in the tundish could be obtained with proper nozzle design. A similar deleterious effect of turbulence generated in the entry region of ladle
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Electromagnetic 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
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Vol. 3 No. 5 Modeling of Continuous Casting Defects
clogging.23The addition of argon gas can replace air in feeding leaks around seals. Argon injection can also raise the minimum pressure in the nozzle above ambi- ent.15Note that this occurs because the slidegate must open up to accommodate the gas (shown in the top of Figure 5) in addition to the pressurizing effect of the gas.
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UTN Porous Gas Flow draft submission-bgt-rl
Abstract Argon gas commonly is injected into the liquid metal stream through the porous and gas injection through the upper tundish nozzle (UTN) during continuous casting to prevent . 2 reoxidation and nozzle clogging 1 as shown in Figure 1. 2
Get PriceSome Metallurgical Considerations Pertaining to the
Jan 01 2014 · In order to minimize nozzle blockage and enhance the flotation of nonmetallic inclusions argon gas is sometimes injected down the submerged entry nozzle. This can have a pronounced effect on fluid flow behavior. If argon injection is excessive mold slag can be drawn into the molten steel and end up as defects in the product.
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