Mold Thermo-Mechanical Rigidity Criterion for Surface Quality of Continuous Casting of Steel

El-Bealy, Mostafa Omar

doi:10.4236/msa.2013.41006

Cited by 4 publications

(7 citation statements)

References 28 publications

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“…This strain affects the distance between the dendrites and therefore the interdendritic fluid flow between the dendrites and the macrosegregation directly in the different spray zones. 13,29,30…”

Section: Resultsmentioning

confidence: 99%

New macrosegregation criteria for quality problems in continuous casting of steel

El-Bealy

2013

Ironmaking & Steelmaking

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To estimate the quality condition in continuously cast steel slabs, simple but accurate macrosegregation criteria have been proposed. The formation of macrosegregation phenomena in continuous casting of peritectic carbon steels has been investigated by metallographic study of collected slab samples. The metallographic study involved plant trails to collect the slab samples and to prepare them for chemical macrosegregation analysis. The experimental results show a fluctuation of carbon between positive and negative segregation with distance from slab surface based on the cooling conditions experienced by the slab. Via mathematical analysis, formulae of average macrosegregation level ASL, its fluctuation level FSL and its segregation quality number SQN have been developed. The results calculated by these formulae show good agreement with the description of the formation mechanisms of different continuous casting defects and their locations. Therefore, these calculations illustrated that macrosegregation criteria and their distributions can be considered by experimental, simple and vital tools to evaluate the conditions of surface and inner qualities in continuously cast steel slabs. The mechanisms of these criteria with some mechanisms of continuous casting defects have been explained and discussed.

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Section: Resultsmentioning

confidence: 99%

New macrosegregation criteria for quality problems in continuous casting of steel

El-Bealy

2013

Ironmaking & Steelmaking

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“…Because of the fluctuating nature of mould cooling conditions, 44,45 function of dwell time [46][47][48] cannot be used. This is due to complex phenomena governing the mould heat transfer, specifically the mechanism of air gap formation and ferrostatic pressure head.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

“…This is due to complex phenomena governing the mould heat transfer, specifically the mechanism of air gap formation and ferrostatic pressure head. 45 In this study, the fluctuating mould cooling conditions approach proposed by El-Bealy and Fredriksoon 45 and modified by El-Bealy 3,21,47 to use the fluctuating macrosegregation phenomenon as verification of mould heat transfer history was used.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

“…This is due to complex phenomena governing the mould heat transfer, specifically the mechanism of air gap formation and ferrostatic pressure head 45. In this study, the fluctuating mould cooling conditions approach proposed by El-Bealy and Fredriksoon45 and modified by El-Bealy3, 21, 47 to use the fluctuating macrosegregation phenomenon as verification of mould heat transfer history was used. El-Bealy45 presented measurements of macrosegregation distributions for continuously cast steel billets made by Rogberg35 and by El-Bealy3, 47 for a slab caster considered similar as for this work.…”

Section: Model Formulationmentioning

confidence: 99%

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Spray cooling pattern and microthermomechanical rigidity criterion for improving inner quality in continuously cast steel slabs

El-Bealy

2013

Ironmaking & Steelmaking

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A new concept has been developed to assess, and a new technique developed to improve, the microthermomechanical rigidity of the solidifying shell in the secondary cooling zones during continuous casting of steel. This is to maximise the coherent solid shell resistance 'I c ' against thermometallurgical and mechanical stresses at different levels from meniscus. The idea behind this concept is to optimise the degree of homogeneity of the cooling pattern between a pair of rolls. The effect of the degree of homogeneity of the cooling pattern between a pair of rolls 'HDCP', in different spray cooling zones on the different types of centreline segregates has been investigated. A number of plant trials with two different water cooling patterns between a pair of rolls have been performed. The metallographic investigation contains examinations and measurements of the level of centreline segregates of collected samples. A one dimensional (1D) transient finite difference mathematical model of thermal, solidification, solid shell resistance and cooling conditions has been developed to test the different effects of spray patterns on the microthermomechanical rigidity concept and therefore on the mechanism of centreline macrosegregation level. The results indicate that the increase in the degree of homogeneity of the cooling conditions is proportional to the increase in slab internal microquality. The results show that the degree of homogeneity of the cooling pattern affects centreline macrosegregation significantly. This depends significantly on the degree of homogeneity of cooling pattern between a pair of rolls, its location from the meniscus and, generally, on the increase microthermomechanical rigidity concept.

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“…The uniform behaviors of C and S fluctuations result from the reasons mentioned above in the analysis of first group. In addition to these reasons, the constant casting speed leads to increase the homogeneity degree of heat transfer between the rolls and reduces the levels of segregations fluctuations of C and S [38] [44] [45].…”

Section: Groupmentioning

confidence: 99%

Macrosegregation Quality Criteria and Mechanical Soft Reduction for Central Quality Problems in Continuous Casting of Steel

El-Bealy¹

2014

MSA

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In order to study the central quality of continuously cast tool steel slabs, the simple model has been developed to simulate the macrosegregation quality criteria. The model calculates different quality criteria such as average macro-segregation level criterion "ASL", its fluctuation level "FSL" and its segregation quality number "SQN". These criteria are calculated based on the previous measurements of carbon and sulfur concentrations distributions in final region of spray zones and centerline area of lower and upper slab sides. The effect of mechanical soft reduction Technique "MSR" on the slab centerline quality is examined and analyzed. The model results show that MSR affects the quality of centerline areas significantly by different ways based on the casting speed. The experimental and theoretical results clarify that the qualities of different slab sides are different for all collected samples. The model results show also that the accuracy of the macro-segregation quality criteria increases quantitatively with increasing the number of analyzed segregated elements. Therefore, the macrosegregation quality criteria and their distributions can be considered as the most simple and vital tool to evaluate the various slab qualities. Finally, the mechanism of centerline segregation formation with mechanical soft reduction is discussed in this study.

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Mold Thermo-Mechanical Rigidity Criterion for Surface Quality of Continuous Casting of Steel

Cited by 4 publications

References 28 publications

New macrosegregation criteria for quality problems in continuous casting of steel

New macrosegregation criteria for quality problems in continuous casting of steel

Spray cooling pattern and microthermomechanical rigidity criterion for improving inner quality in continuously cast steel slabs

Macrosegregation Quality Criteria and Mechanical Soft Reduction for Central Quality Problems in Continuous Casting of Steel

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