Determination of strand surface temperature and heat transfer during continuous casting

Barber, Barry; Patrick, B.; Watson, Peter; York, Richard; Kitching, F.; Sha, Hong; Kraushaar, K.; Spitzer, Karl‐Heinz

doi:10.1051/metal/199693111403

Cited by 6 publications

(7 citation statements)

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“…In the secondary cooling zone, there are mainly three mechanisms which influence heat exchange: (1) heat removed by spraying cooling water directly on the strand surface, (2) heat removed by support rollers and (3) by radiation. Since measurements of surface temperatures of a slab are extremely difficult, there habe been only few investigations about the influence of rollers on the heat transfer and the thermo‐mechanical behaviour of slabs 2, 3. In the work of Diener 2 the temperature of guide rollers was measured at different distances from the surface of guide rollers without inside cooling in the secondary cooling zone of a slab continuous caster.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Support Rollers of Continuous Casting Machines on Heat Transfer and on Stress‐Strain of Slabs in Secondary Cooling

Xia

Schiefermüller

2010

steel research int.

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The processes of solidification and heat extraction are important for the continuous casting of steel. In this work, investigations on the influence of support roller contact on solidification in a strand of a slab caster, such as surface temperature and strand shell growth, and on thermal strain and stress in the slab have been carried out. The results show that roller contact has an influence on the solidification of steel and on the thermomechanical behaviour of the strand.

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Section: Introductionmentioning

confidence: 99%

“…It was found that the cooling effect of the rollers is not negligible. In the work of Barber 3 the surface temperature of a slab was measured using embedded thermocouples in the strand 4. The contribution of the rollers to the heat transfer in the secondary cooling zone was analysed.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Support Rollers of Continuous Casting Machines on Heat Transfer and on Stress‐Strain of Slabs in Secondary Cooling

Xia

Schiefermüller

2010

steel research int.

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“…Since in the current study, H pool,0 at y = 0 as an initial condition for RKM is unknown, the value of H pool,L at y = L (computed with Froude criterion using Eq. [13]) was taken as a beginning point. Therefore, the backward integration was implemented from a known downstream height H pool,L .…”

Section: E Final Differential Equation and Integration Methodsmentioning

confidence: 99%

“…The required boundary condition is obtained by solution of Eq. [13]. Table I gives the development of the (H pool,L /R r ) values used in the computation of the H pool profiles presented in Section IV of this paper.…”

Section: Use Of Froude Criterion As Boundary Condition At the End Of The Channelmentioning

confidence: 99%

Height of Water Pool in the Roll Nip of Secondary Cooling Zone in Continuous Slab Caster: Application of Open Channel Hydraulics

Khani

Palkowski

Schwerdtfeger

2021

Metall Mater Trans B

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In continuous casting of steel, the strand is cooled in the upper part of the secondary cooling zone with water sprayed by nozzles towards the strand surface. The water accumulates in the nip of the lower roll of a roll pair, forming a water pool which then drains off towards the ends of the roll. In the present work, open channel hydraulics was applied for computation of the water pool height in the nip between roll and strand in continuous slab casting. The differential equation describing the change of pool height for the spatially varied flow with increasing discharge was solved with the Runge–Kutta technique using as boundary condition the pool height at the end of the nip. The effects of the Manning friction factor n and the energy coefficient α were determined in sets of computation. It was shown that the hydraulic theory could predict water profiles in the nip of continuous casting rolls to a good approximation.

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“…Barber et al 10) measured the surface temperature in the casting direction of a slab using thermocouples embedded in the strand. The contributions of roll cooling, spray cooling and indirect cooling to the heat transfer in the secondary cooling zone were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Development of Hard Secondary Cooling by High-pressure Water Spray in Continuous Casting

Ito¹,

Murai²,

Miki³

et al. 2011

ISIJ Int.

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Cooling intensity in secondary cooling is an important factor for achieving high-speed casting. In this study, we investigated the effects of the hydraulic pressure and water flow rate of a cooling water spray on cooling intensity, and developed a more efficient secondary cooling system with a high-water pressure spray. In laboratory experiments, a test plate was heated to 1 273 K and then cooled below a certain temperature by one nozzle under various experimental conditions. The heat transfer coefficient was estimated using the temperature data from thermocouples 3 mm below the cooled surface. The average heat transfer coefficient with a hydraulic pressure of 5 MPa was 2.8 times larger than that of a conventional water spray nozzle at the same water flow rate. On the basis of the laboratory results, plant trials were carried in the Kurashiki No. 2 CCM at JFE West Japan Works. A high-pressure water supplying device (maximum 5 MPa) with high pressure type nozzles was installed in one segment at a position from 2.5 to 4.0 m below the meniscus and the water flow rate of the high-pressure spray was the same as that of the conventional one. It was confirmed that casting speed was increased by 30% without any inner cracks or surface cracks for several steel grades. In addition, the measurements of slab surface temperature were in good agreement with the thermal calculation results from the laboratory heat transfer coefficient data.

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Determination of strand surface temperature and heat transfer during continuous casting

Cited by 6 publications

References 0 publications

The Influence of Support Rollers of Continuous Casting Machines on Heat Transfer and on Stress‐Strain of Slabs in Secondary Cooling

The Influence of Support Rollers of Continuous Casting Machines on Heat Transfer and on Stress‐Strain of Slabs in Secondary Cooling

Height of Water Pool in the Roll Nip of Secondary Cooling Zone in Continuous Slab Caster: Application of Open Channel Hydraulics

Development of Hard Secondary Cooling by High-pressure Water Spray in Continuous Casting

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