Effect of soft reduction process on segregation of a 400 mm thick high-alloy steel slab

Chu, Rensheng; Li, Zhanjun; Liu, Jingang; Fan, Yong; Yang, Lijun; Ma, Cheng

doi:10.1007/s42243-020-00542-6

Cited by 12 publications

(8 citation statements)

References 21 publications

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“…The main purpose of soft reduction technology is to control the formation of macro-segregation by suppressing of volume shrinkage at final solidification stage and interrupt the suction flow of residual and segregated molten metal, as shown in Figure 1. The basic principle of reduction technology [19,[32][33] is to apply an external force in an appropriate area of cast product during the solidification process, which compensates for the volume shrinkage at the solidification end. The implementation of small reduction amount on the surface of billet or slab is an effective method to reduce the center segregation of alloying elements and internal defects in cast products during solidification process, which is known as soft reduction.…”

Section: Basic Principle Of Reduction Technologymentioning

confidence: 99%

“…The effect of SR on center segregation is more complicated, and it is difficult to fully reveal its mechanism by experimental research. The main functions of reduction technology are as follows [32,33,36]:…”

Section: Basic Principle Of Reduction Technologymentioning

confidence: 99%

“…Prior research reports [22,[58][59][60] have investigated the dynamic reduction technology from the perspective of numerical simulation and analyzed it by using the solidification heat transfer theory and finite element difference method to establish mathematical model. Moreover, the nail shooting experiment was conducted to explore the solid fraction with regard to the different reduction amount, reduction interval, reduction rate, and other parameters [19,[32][33][34]. The detailed research progress and development status of reduction technology have been elaborated in the following sections.…”

Section: Research On Reduction Technologymentioning

confidence: 99%

“…This significantly maintained the production of high-quality slabs during the slab continuous casting process. The solidification of high-alloyed steel (0.4C-1.5Mn-2Cr-0.35Mo-1.5Ni) resulted in a high temperature gradient of solidified shell with the formation of columnar crystal, which contributed to the center segregation and cracking due to the high carbon content and was significantly improved by optimized SR parameters [33]. Chen et al [16] conducted the industrial experiments on machine soft reduction (MSR) and improved the internal quality of the bearing billet.…”

Section: Industrial Field Researchmentioning

confidence: 99%

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Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Nian

Zhang

et al. 2022

Processes

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Continuous casting is a dominant steelmaking process due to its steady-state nature, enhanced yield of steel production, and low consumption of energy and manpower. However, the production of defect-free cast products is still a big challenge, as the internal defects, including macro-segregation of alloying elements, cracks, and pores, can be easily formed during the solidification process, which seriously deteriorates the microstructure and mechanical properties of the cast products. Therefore, this paper puts forward the common solutions to overcome these problematic issues. The reduction technology can effectively improve the center segregation of the billet, bloom, and slab. The history of the development of the reduction technology is summarized and classified according to the variations in research trend. Furthermore, the basic principles and parameters of reduction technology are described to implement them in the actual production process. This paper compares the similarities and differences between soft reduction (SR) and heavy reduction (HR) technologies with a particular focus on the theoretical research of HR technology and further elaborates the key parameter and equipment problems during implementation of HR. Moreover, this paper also considers the HR technology adopted by Baosteel as a case study, which helped to put forward some viewpoints for the future development of reduction technology.

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Section: Basic Principle Of Reduction Technologymentioning

confidence: 99%

Section: Basic Principle Of Reduction Technologymentioning

confidence: 99%

Section: Research On Reduction Technologymentioning

confidence: 99%

Section: Industrial Field Researchmentioning

confidence: 99%

See 2 more Smart Citations

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Nian

Zhang

et al. 2022

Processes

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show abstract

“…Defects deteriorate products' service performance and fatigue life [7]. To control internal defects, researchers proposed many processes such as the soft reduction (SR) process [8,9] and heavy reduction (HR) process. Compared with the conventional process, the HR process applies a larger equivalent strain through a small reduction amount, pressuring the billet's internal shrinkage and porosity [10,11], breaking the dendrite [12], refining the grain, and improving density and segregation [13] based on the temperature gradient rolling.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Liu

Cheng

et al. 2021

Metals

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High-temperature reduction pretreatment (HTRP) is a process that can significantly improve the core quality of a billet. The existing flow stress data cannot meet the needs of simulation due to lack of high temperature data. To obtain the hot forming process parameters for the high-temperature reduction pretreatment process of 42CrMo steel, a hot compression experiment of 42CrMo steel was conducted on Gleeble-3500 thermal-mechanical at 1200–1350 °C with the rates of deformation 0.001–10 s−1 and the deformation of 60%, and its deformation behavior at elevated temperature was studied. In this study, the effects of flow stress temperature and strain rate on austenite grain were investigated. Moreover, two typical constitutive models were employed to describe the flow stress, namely the Arrhenius constitutive model of strain compensation and back propagation artificial neural network (BP ANN) model. The performance evaluation shows that BP ANN model has high accuracy and stability to predict the curve. The thermal processing maps under strains of 0.1, 0.2, 0.3, and 0.4 were established. Based on the analysis of the thermal processing map, the optimal high reduction process parameter range of 42CrMo is obtained: the temperature range is 1250–1350 °C, and the strain rate range is 0.01–1 s−1.

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Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

Cheng,

Liu,

Liu

et al. 2024

steel research int.

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To investigate the influence of rolling passes on the internal quality during high‐temperature reduction pretreatment (HTRP), three cast ingots with identical total reduction but varying numbers of rolling passes are prepared. The 3D distribution, size, and quantity of defects are analyzed using ultrasonic nondestructive microscopy. The effect of rolling passes on defect healing is studied, with macrostructure, microstructure, and grain size analysis aided by finite element software. In contrast to the three‐pass HTRP, the one‐pass HTRP demonstrates a diminishment of 7% in defect dimensions and a notable decline of 66% in the quantity of defects. The results reveal that increasing the number of rolling passes leads to a deterioration in internal quality of the slab. Reducing the number of rolling passes improves internal strain penetration, facilitates the recrystallization process, and enhances the microstructure uniformity, ultimately improving the internal quality.

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Effect of soft reduction process on segregation of a 400 mm thick high-alloy steel slab

Cited by 12 publications

References 21 publications

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Application Status and Development Trend of Continuous Casting Reduction Technology: A Review

Deformation Behavior and Constitutive Equation of 42CrMo Steel at High Temperature

Effects of Deformation Penetration and Recrystallization on the Internal Quality of Casting Ingot

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