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

Xia, Guangmin; Schiefermüller, A.

doi:10.1002/srin.201000089

Cited by 22 publications

(18 citation statements)

References 11 publications

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“….......................... (12) Where, N R i is the roller number of i th cooling zone; R i L is the contact length between roller and slab in i th cooling zone, m; Z i L is the length of the i th cooling zone, m. According to the previous research, 17,20,21) h c i is set as 0.4-1.4 Kw/(m 2 ·°C), and R i L is equal to 0.02 m. According to the experimental results of F. Ramstorfer et al 6) and Nozaki et al, 11) the h i w is the function of the water flux distribution, and it could be expressed as:…”

Section: Boundary Conditionsmentioning

confidence: 99%

Uneven Solidification during Wide-thick Slab Continuous Casting Process and its Influence on Soft Reduction Zone

Luo

Zhu

et al. 2014

ISIJ Int.

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A two-dimensional heat transfer model was developed to analyze the uneven solidification, particularly the shape of solidification end in wide-thick slab continuous casting process. In order to ensure the accuracy of simulation, material properties of peritectic steel were calculated by weighted averaging of phase fractions, and the boundary conditions were obtained by realistic water flux distribution on the slab transverse surface. The model was verified by nail shooting results at different locations of strand, and the absolute value of relative error was found to be no more than 2.12%. According to the simulation results, the liquid core around 1/8 location of slab width increased after the water flux was decreased around the slab corner to reduce transverse corner cracks. The soft reduction (SR) zone was optimized to reduce macro-segregation both at the slab center and 1/8th location. The plant results showed that the inner quality of wide-thick slab was significantly improved in the whole transverse section with the optimized SR zone parameters. Fig. 1. The macrograph of centerline macro-segregation in 1 600 mm×180 mm slab transverse section.

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Section: Boundary Conditionsmentioning

confidence: 99%

Uneven Solidification during Wide-thick Slab Continuous Casting Process and its Influence on Soft Reduction Zone

Luo

Zhu

et al. 2014

ISIJ Int.

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“…At present, the researches of the influence on heat transfer between the roll and slab mainly focus on the contact angle, the variation of slab temperature, and the oxidation process of rolls under different conditions. Xia and Schiefermüller [2] pointed out that the contact length between the slab and roll has an important influence on the distribution of temperature and stress-strain of the roll in the secondary cooling zone and found that the maximum stress on the support roll under this experimental condition was less than 70 Mpa. Javurek et al [3] compared heat transfer models of rolls with different dimensions and proposed mathematical models with different complexities to calculate the temperature of the slab and roll.…”

Section: Introductionmentioning

confidence: 80%

“…Therefore, it is necessary to study the change of roll yield strength at high temperature to prolong the roll service life in the actual production process. Xia and Schiefermüller found that the maximum stress on the support roll was less than 70 MPa. Liu and Bayoumi et al studied the stress state of the roll during the soft reduction process in slab continuous casting and found that the stress of the roll was generally less than 50 MPa.…”

Section: Resultsmentioning

confidence: 99%

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Liu

Long

et al. 2019

steel research int.

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A 3D model of heat transfer between the circular‐distributed water channel roll (CDWCR) and slab during ultrathick slab continuous casting process is established, considering the structure of water channels inside CDWCR and rotating contact between the roll and slab. The results show that the contribution of conduction heat transfer in the heating process of the roll is greater than that of radiation heat transfer, and maximum surface temperature of the roll is 460 K, located at the place where it is right out of contact with the slab, and the change of internal temperature of the roll lags behind the change of surface temperature. The temperature decreases gradually from the outside to the inside in the radial direction. The temperature of the CDWCR inside the circle of cooling water channels is no more than 325 K. The yield strength of CDWCR is analyzed, showing that the strength of the roll meets the requirements of using it in the process. In addition, the orthogonal method is used to analyze the influence factors on CDWCR temperature. The results indicate that the orders of factors affecting more are the contact angle, the slab temperature, the casting speed, and the inlet speed of cooling water.

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“…For roll contact:

h_{c o n t}^{i} = \frac{h_{R / S}^{i} \cdot N_{R}^{i} \cdot L_{R / S}}{L^{i}}

where, h i cont is the equivalent heat transfer coefficient between the strand and rolls, W (m 2 °C) −1 ; N i R is the number of roll; h i R / S , L R / S , respectively, denote the heat transfer coefficient and the contact length between the strand and roll in W (m 2 °C) −1 and m. According to the previous work, h i R / S ranges from 1000 to 1300 and L R / S was set as 0.02; L i represents the total length of the i th cooling zone, m.…”

Section: Thermal‐mechanical Coupling Modelmentioning

confidence: 97%

Analysis of the Thermal Contraction of Wide‐Thick Continuously Cast Slab and the Weighted Average Method to Design a Roll Gap

Zhu

2017

steel research int.

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A three-dimensional (3D) thermo-mechanical coupling model is established to describe the uneven solidification and thermal contraction behavior during the process of continuous casting of wide-thick slabs. To improve the accuracy of the simulated results, the thermal and mechanical material properties are calculated with the weighted average phase fraction method, and the boundary conditions is derived from the actual measured water flux distribution. The predicted heat transfer results are verified with the measured shell thickness and surface temperature. With this model, the non-uniform heat transfer and thermal contraction behavior under different casting conditions are investigated. Finally, a weighted average method to design the roll gap is proposed and implemented into practical production. The results from the plant after the roll gap optimization indicate that the internal quality of the wide-thick slab is dramatically improved and that the casting operation is more stable.

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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

Cited by 22 publications

References 11 publications

Uneven Solidification during Wide-thick Slab Continuous Casting Process and its Influence on Soft Reduction Zone

Uneven Solidification during Wide-thick Slab Continuous Casting Process and its Influence on Soft Reduction Zone

Numerical Simulation of Heat Transfer between Roll and Slab under Dry Secondary Cooling in Ultrathick Slab Continuous Casting

Analysis of the Thermal Contraction of Wide‐Thick Continuously Cast Slab and the Weighted Average Method to Design a Roll Gap

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