Macrosegregation Behavior in Continuously Cast High Carbon Steel Blooms and Billets at the Final Stage of Solidification in Combination Stirring.

Oh, Kyungseok; Chang, Young Won

doi:10.2355/isijinternational.35.866

Cited by 78 publications

(36 citation statements)

References 1 publication

(1 reference statement)

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“…Jie ZENG, 1) * Weiqing CHEN, 1) Senlin ZHANG, 2) Yi LI 3) and Qiuliang WANG (Received on April 17, 2015; accepted on June 15, 2015) Production of continuously cast high carbon steel that very low center macrosegregation is an important object in meeting high quality requirements. Apart from the widely known methods of reducing macrosegregation during continuous casting, final permanent magnet stirring (FPMS) provides an alternative for producing steel with low macrosegregation.…”

Section: Development and Application Of Final Permanent Magnet Stirrimentioning

confidence: 99%

“…[1][2][3] The continuous casting of high carbon 82A steel with a section size of 180 mm × 240 mm has been improved considerably by low temperature casting and proper using of final electromagnetic stirring (FEMS), but their center carbon segregation appears not to be enough to satisfy customer's demand for best quality. Center segregation in high carbon steel results in a high concentrations of chemical components especially carbon element and has great influence on the quality of final product.…”

Section: Introductionmentioning

confidence: 99%

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Development and Application of Final Permanent Magnet Stirring during Continuous Casting of High Carbon Rectangular Billet

Zeng

Chen

Zhang³

et al. 2015

ISIJ Int.

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Section: Development and Application Of Final Permanent Magnet Stirrimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and Application of Final Permanent Magnet Stirring during Continuous Casting of High Carbon Rectangular Billet

Zeng

Chen

Zhang³

et al. 2015

ISIJ Int.

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“…6(a) by the short dashed line, carbon segregation has basically taken shape when the value of central liquid fraction reaches 0.3. According to consensus, performing the final electromagnetic stirring (F-EMS) or mechanical soft reduction at the region corresponding to high central solid fraction does not effectively improve centerline segregation, 40,41) for which the formation of segregation is also an important cause, apart from poor fluidity. The degree of carbon segregation at billet center increases from 1.0 to 1.147 along the casting direction, which leads to decrease of solidus temperature from 1 623 K to 1 596 K, as shown in Fig.…”

Section: Evolution Of Macrosegregationmentioning

confidence: 99%

Numerical Modeling of Macrosegregation in Round Billet with Different Microsegregation Models

et al. 2017

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A macrosegregation model, coupling fluid flow, heat and solute transport model, was developed based on continuum model to predict the evolution of macrosegregation in continuous round billet casting, as well as the influence of microsegregation model choice on prediction of macrosegregation. Evolution and characteristics of macrosegregation corresponding to predicted solidification were revealed. As solidification proceeds, solutes are ejected from solid phase to liquid at solidification front. The resulting mushy zone is enriched by solutes, due to the low velocity and limited diffusion, which produces segregation at the billet center as the liquid available for dilution diminishes near the end of solidification. Predicted and experimental results for surface temperature and centerline segregation compare agreeably, which indicates the validity of the coupled macrosegregation model in this work. A detailed analysis was performed to investigate the influence of microsegregation model on prediction of macrosegregation, demonstrating that choice of model affects predicted segregation degree of solutes, which effect varies with type of solute, due to the solute back-diffusion coefficient.

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“…In recent decades, many techniques have been proposed to minimize the detrimental center carbon segregation in high-carbon continuous casting, such as low temperature casting, intensive cooling at the solidification end, soft reduction, large reduction, and electromagnetic stirring (EMS) [9][10][11]. Among those techniques, the combination of mold and final electromagnetic stirring (M-EMS and F-EMS) is known as one of the most effective and widely used methods to eliminate the macrosegregation of high-carbon square billet.…”

Section: Introductionmentioning

confidence: 99%

Effect of Final Electromagnetic Stirring Parameters on Central Cross-Sectional Carbon Concentration Distribution of High-Carbon Square Billet

Wan

Chen

et al. 2019

Metals

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The effect of final electromagnetic stirring parameters, with current intensity increasing from 300 A to 400 A and frequency increasing from 4 Hz to 12 Hz, on the electromagnetic forces and carbon concentration distribution of the central cross section of a 70 steel square billet have been studied. Along the center line of the liquid core zone, current intensity of 400 A and frequency of 8 Hz achieve the maximum electromagnetic force at the position 48 mm away from the billet edge among the 10 groups of stirring parameters. Nevertheless, along diagonal of the liquid core zone, the electromagnetic force near the diagonal center is the greatest and the current intensity of 280 A and frequency of 12 Hz obtain the maximum electromagnetic force. The optimal final electromagnetic stirring (F-EMS) parameter to uniform the central cross-sectional carbon concentration and minimize the center carbon segregation of 70 steel billet was obtained with a current intensity of 280 A and frequency of 12 Hz. Under this stirring parameter, the area ratios of carbon concentrations of 0.66 wt%, 0.70 wt% and 0.74 wt% in the middle of the billet cross section reached 28.5%, 56.9% and 10.9%, respectively. Moreover, the carbon segregation indexes for all sampling points were in the range of 0.92-1.05.

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Macrosegregation Behavior in Continuously Cast High Carbon Steel Blooms and Billets at the Final Stage of Solidification in Combination Stirring.

Cited by 78 publications

References 1 publication

Development and Application of Final Permanent Magnet Stirring during Continuous Casting of High Carbon Rectangular Billet

Development and Application of Final Permanent Magnet Stirring during Continuous Casting of High Carbon Rectangular Billet

Numerical Modeling of Macrosegregation in Round Billet with Different Microsegregation Models

Effect of Final Electromagnetic Stirring Parameters on Central Cross-Sectional Carbon Concentration Distribution of High-Carbon Square Billet

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