Work Roll Surface Profile Design and Optimization for Hot-core Heavy Reduction Rolling Process

Li, Tianxiang; Li, Haijun; Li, Ruihao; Wang, Zhaodong; Wang, Guodong

doi:10.2355/isijinternational.isijint-2018-809

Cited by 14 publications

(9 citation statements)

References 27 publications

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“…The coefficient of friction between the roll and the casting slab is 0.3. [ 26 ] The slab size is 260 × 2570 mm 2 , the calculated length of the model is 4100 mm, the number of the grid is 63 924, the diameter of the foot roll is 50 mm, and the diameter of the continuous casting roll in the bending section is 150 mm, and the width of the roll is 2570 mm.…”

Section: Experiments and Model Descriptionmentioning

confidence: 99%

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Zhou

Yin

Liu³

et al. 2022

steel research int.

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To figure out the formation mechanism of transverse corner cracks at the inner and outer arc of peritectic steel slab, the metallurgical microscope, scanning electron microscope with energy‐dispersive X‐ray spectroscopy, and electron probe‐X‐ray microanalysis, are used to study cracks. High‐temperature mechanical properties and the stress distribution of the outer arc of the bending section under different roll gap schemes are studied and simulated. The outer arc cracks expand along the grain boundary, while the inner arc cracks not only extend along the grain boundary but also traverse along the grains. The outer arc cracks are mainly generated at the bending section and are formed and expanded along the ferrite film. The inner arc cracks' cracking temperature is higher than the temperature of austenite transformation to ferrite. The third brittle temperature ranges are 650–850 °C, and the transverse corner crack sensitivity zone is 680–837 °C. The inner arc cracks are generated because of the element segregation and low temperature of the corner and then extended at the straightening section, and new cracks exist. The weakened cooling intensity and bending earlier at the bending section help to reduce the equivalent stress on the slab. The optimized experiments are conducted, and the transverse corner cracks are reduced significantly.

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Section: Experiments and Model Descriptionmentioning

confidence: 99%

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Zhou

Yin

Liu³

et al. 2022

steel research int.

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show abstract

“…The temperature field calculated from continuous casting was used as the initial condition of the rolling stage by defining the node temperature. The temperature-dependent material properties such as Poisson's ratio, Young modulus, thermal conductivity, and specific heat were obtained from authors' own studies [18], which covered the temperature range of the HHR 2 process. The Hansel-Spittel model was selected to describe the relationship between strain and stress, as shown in Equation (1).…”

Section: Fem Resolution Proceduresmentioning

confidence: 99%

“…In recent studies [18,19], an innovative process called hot-core heavy reduction rolling (HHR 2 ) was proposed to eliminate the internal porosity defects of casting steel with heavy thickness. In the HHR 2 process, a two-high rolling mill is installed after the solidification end of the strand.…”

Section: Introductionmentioning

confidence: 99%

“…In the HHR 2 process, a two-high rolling mill is installed after the solidification end of the strand. According to an existing study, a new roll profile for HHR 2 was designed to obtain the best effect on shrinkage closure [18]. The dynamic recrystallization (DRX) model of the Nb-Ti microalloyed steel was also established for the HHR 2 deformation process [19].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Analysis of Dynamic Recrystallization of Casting Slabs during Hot-Core Heavy Reduction Rolling Process

Gong

et al. 2020

Metals

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Hot-core heavy reduction rolling (HHR2) is an innovative technology, where a two-high rolling mill is installed after the solidification end of a strand, which can significantly eliminate the core defects of the slab. The mill exhibits a heavy reduction ratio, which promotes the dynamic recrystallization (DRX) of the slab. This study aims to optimize the parameters of the HHR2 process considering the effect of DRX on microstructure homogeneity. The secondary development of commercial software DEFORM-3D is conducted to calculate the deformation and DRX behavior of HHR2 for different reduction ratios. The parameters of DRX volume fraction and DRX grain size are compared, and finer DRX grains are obtained when the greater reduction ratios are conducted in HHR2. Then, corresponding to the deformation conditions in the HHR2, the thermal–mechanical simulations are conducted on the Gleeble3800 to obtain the average grain sizes before and after this process. When the reduction amount increases from 20 mm to 50 mm, the difference of average grain size between the core and the surface reduces by 52%. In other words, appropriately enhancing the reduction ratio is helpful to reduce the average austenite grain and promote the microstructure uniformity of the slab. These results provide some valuable information on the design of deformation parameters for HHR2.

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“…The previous studies mainly focus on the behavior of void closure, and the result shows the HHR 2 process can efficiently promote the closure of shrinkage cavity. [14] On the other hand, the HHR 2 process can promote the dynamic recrystallization (DRX), which can obtain a better uniformity of microstructure comparing with the original casting slab. [15,16] Furthermore, the DRX behavior may be different from the conventional hot rolling (CHR) process because a greater deformation DOI: 10.1002/srin.202300043 Hot-core Heavy Reduction Rolling (HHR 2 ) is a new technology that improves the core quality of blooms by using a heavy reduction roller at the solidification end.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Dynamic Recrystallization in Blooms between Conventional Rolling and Hot‐Core Heavy Reduction Rolling Process

Gao

et al. 2023

steel research int.

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Hot‐core Heavy Reduction Rolling (HHR2) is a new technology that improves the core quality of blooms by using a heavy reduction roller at the solidification end. Dynamic recrystallization (DRX) is expected to optimize the microstructure in this process. But the difference of DRX characteristic between HHR2 and conventional hot rolling (CHR) is an unclear problem. Herein, the differences of DRX behavior between two rolling processes are studied. If two rolling processes are carried out under the same deformation temperature and strain rate, the work hardening in CHR samples is greater than that in HHR2. Moreover, DRX occurrence in HHR2 lags behind the CHR process due to lower growth rate of dislocation density achieved in HHR2. By using DRX models, the DRX area and DRX volume fractions in bloom are calculated. The great temperature gradient and low strain rate decrease the DRX critical strain in the HHR2 process. The DRX region is mainly around the core of the HHR2 bloom, where the DRX volume fraction achieves 41.8%. The maximum value of DRX volume fraction in CHR bloom only achieves 20.1% because the great strain rate and uniform temperature lead to a low level of deformation permeability.

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Work Roll Surface Profile Design and Optimization for Hot-core Heavy Reduction Rolling Process

Cited by 14 publications

References 27 publications

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Research Mechanism of Formation on Transverse Corner Cracks in the Continuous Casting Slab of Peritectic Steel

Finite Element Analysis of Dynamic Recrystallization of Casting Slabs during Hot-Core Heavy Reduction Rolling Process

Comparison of Dynamic Recrystallization in Blooms between Conventional Rolling and Hot‐Core Heavy Reduction Rolling Process

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