Uniform Secondary Cooling Pattern for Minimizing Surface Reheating of the Strand During Round Bloom Continuous Casting

Hong, Fan; Long, Mujun; Yu, Sheng; Chen, Dengfu; Liu, Tao; Chen, Huabiao

doi:10.1007/s11837-017-2679-x

Cited by 9 publications

(13 citation statements)

References 18 publications

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“…The obtained data on temperature dynamics of continuously cast billets along their length testify on non-effective tuning of secondary cooling. So, intensive cooling of billet surfaces in the first secondary cooling segments with consequent heating of surface layers induces appearing of additional thermal stresses in solidified metal, what is considered as the main cause of forming of cracks with different form and depth [1][2][3][4][5][6][7][8][9][10]. In addition to this, billet straightening within the temperature range from 900 to 700 °C, which corresponds to the interval of γ → α transformation, is the additional cause of appearance of transverse cracks, especially on tracks of mould oscillation.…”

Section: Examination Of Thermal Conditions Of Solidificationmentioning

confidence: 99%

“…However, continuous casting technology is connected with arising of increased stresses in hardened crust, what can lead to forming of hot cracks on the surface and across the section of billet [1][2][3][4][5], which deteriorate billet quality. Round continuously cast billet is especially sensitive to forming of hot cracks [6][7][8][9]. Analysis of the results of numerous investigations [6][7][8][9][10][11] displays that metal plasticity fall due to irrational temperature and speed casting mode and secondary cooling procedure are the main causes of hot cracks forming.…”

Section: Introductionmentioning

confidence: 99%

“…Round continuously cast billet is especially sensitive to forming of hot cracks [6][7][8][9]. Analysis of the results of numerous investigations [6][7][8][9][10][11] displays that metal plasticity fall due to irrational temperature and speed casting mode and secondary cooling procedure are the main causes of hot cracks forming. At the same time, despite the large amount of publications devoted to this theme, the problems of quality improvement of continuously cast billet and optimization of technical and economical casting parameters can be solved in general individually in each single case.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvement of the secondary cooling mode for continuous casting of round billets at Ural Steel JSC

Shapovalov¹,

Dema²,

Amirov³

et al. 2021

cisisr

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Section: Examination Of Thermal Conditions Of Solidificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement of the secondary cooling mode for continuous casting of round billets at Ural Steel JSC

Shapovalov¹,

Dema²,

Amirov³

et al. 2021

cisisr

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“…The heat conduction formula, Equation 1, is used to solve for the temperature field of round bloom in the polar coordinate system [16]:…”

Section: Heat Transfer Modelmentioning

confidence: 99%

Control of Shrinkage Porosity and Spot Segregation in Ø195 mm Continuously Cast Round Bloom of Oil Pipe Steel by Soft Reduction

Zhang

et al. 2020

Metals

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Based on the Ø195 mm round bloom continuous casting of oil pipe steel, a two dimensional thermal-mechanical coupled model has been developed to investigate the deformation behavior of round bloom during soft reduction (SR) in the reduction force mode. Good agreement was achieved in surface temperature, shell thickness and contact zone width from modeling and measurement. Under the same reduction force, the reduction amount of round bloom at the front unit is much larger than back unit. Moreover, due to its higher temperature and lower center solid fraction, the deformation penetration before solidification is much stronger than that after solidification. Considering the limitation of the round bloom ovality, the maximum allowable force in reduction unit is calculated. According to the simulation results, a multi-unit soft reduction plan was proposed and carried out on the Ø195 mm round bloom. After the reduction process of No.1 to No.3 withdrawal units, the shrinkage porosity in the center of the round bloom was almost vanished, while the number and size of spot segregation were significantly reduced. Moreover, the oil pipe produced by the round bloom with SR got a better resistance to sulfide stress corrosion (SSC). It indicates that SR is an effective technology for the round bloom to control the shrinkage porosity and spot segregation in the continuous casting.

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“…In addition, Feng et al [22] established the optimal construct of water distribution in the secondary cooling zone, which decreases the heat loss rate and the surface temperature gradient of the slab simultaneously. Fan et al [23] proposed a uniform secondary cooling pattern (USCP) for minimizing the surface reheating of the strand, and it shows that the appropriate extension of the secondary cooling zone can significantly reduce the longitudinal surface reheating of the strand. Gong et al [24] investigated the effects of different solidification rates on the microstructures, microsegregation, and mechanical properties of cast superalloy K417 G. It indicates that the slowest cooling rate of 0.84°C/s showed the best comprehensive mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Analysis of the Effects of Water Distribution on Cracks during Vertical Continuous Casting under Soft Reduction Conditions

Yao

Wang

Liu

et al. 2020

Advances in Materials Science and Engineering

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In the production process of continuous casting slab, the unreasonable secondary cooling system can lead to serious crack defects. This study focuses on the problem of cracks in nuclear power stainless steel produced by vertical continuous casting under soft reduction conditions. Based on the actual production process parameters, the thermomechanical finite element model was established to investigate the effects of water distribution in the secondary cooling zones on cracks by using ProCAST. The results show that the stress concentration is obvious under the original process, especially the positions of 4 mm below the wide surface and 6 mm below the narrow surface. It is easy to generate cracks, and the area with the highest hot-tearing index is approximately 26 cm2. In addition, the secondary cooling system is adjusted based on the existing problems of the original process. The temperature of the casting slab rises by about 15°C at the solidification end point, and the length of the liquid core increases by about 0.5 m when the quantity of the water flow decreases in zone 2 and zone 3. The stress concentration is alleviated, and the possibility of cracking is reduced. Especially, it is evident that the proportion of water on the loose side margin increases from 40% to 45%, while the proportion of water on the fixed side margin of zone 3 is adjusted from 56% to 60%.

show abstract

Uniform Secondary Cooling Pattern for Minimizing Surface Reheating of the Strand During Round Bloom Continuous Casting

Cited by 9 publications

References 18 publications

Improvement of the secondary cooling mode for continuous casting of round billets at Ural Steel JSC

Improvement of the secondary cooling mode for continuous casting of round billets at Ural Steel JSC

Control of Shrinkage Porosity and Spot Segregation in Ø195 mm Continuously Cast Round Bloom of Oil Pipe Steel by Soft Reduction

Thermomechanical Analysis of the Effects of Water Distribution on Cracks during Vertical Continuous Casting under Soft Reduction Conditions

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