Improvement of center segregation in high-carbon steel billets using soft reduction

Wang, Wenjun; Hu, Xianggang; Ning, Linxin; Bülte, Raimund; Bleck, Wolfgang

doi:10.1016/s1005-8850(06)60100-x

Cited by 16 publications

(7 citation statements)

References 2 publications

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“…The previous research reports have shown that the macrosegregation of carbon and other alloying elements has a direct relationship with the formation of internal crack defects. [23] 3.3. X-Ray Micro-Computed Tomography Observations…”

Section: Center Carbon Macrosegregationmentioning

confidence: 99%

Spatial Characterization of Internal Defects in Medium Carbon Steel via X‐Ray Computed Tomography

Ali

Zhang

Sui

et al. 2022

steel research int.

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Herein, the 3D characterization of internal defects in medium carbon steel with different soft reduction (SR) parameters is investigated, as regards its spatial morphology and size distribution using X‐ray computed tomography. The size of defects and their shape complexity increase from the equiaxed toward the center of the ingot, and the total number of defects is larger at the equiaxed region, which exhibits the aggregation and growth of small spherical pores into the large defects from equiaxed toward the center region. The two types of shrinkage defects, including island and net shrinkage, are identified. With the minimum reduction amount of 2 and 4 mm, the number and size of defects along with the carbon macrosegregation in the equiaxed region and center of the ingot are less as compared to the high reduction amount of 6 mm and without SR technology. The size of gas pores with sphericity >0.6 is <70 um with different reduction amounts and exceeds up to 150 um without SR. Therefore, minimum reduction amounts can easily regulate the internal defects in medium carbon steel.

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Section: Center Carbon Macrosegregationmentioning

confidence: 99%

Spatial Characterization of Internal Defects in Medium Carbon Steel via X‐Ray Computed Tomography

Ali

Zhang

Sui

et al. 2022

steel research int.

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“…Pan Yifang and Men Feng [11] sorted out the relevant measures for eliminating backward production capacity in the steel industry in China, optimized them on this basis, and put forward new feasible measures. Wang Mengnan [12] studied the path of energy conservation and emission reduction in the iron and steel industry with the help of the LEAP model and analyzed that capacity reduction and innovative technology have an important impact on the development of the low-carbon economy. Tu Zhengge [13] used the optimized Laplace index decomposition method to empirically compare the contribution of different emission reduction measures to low-carbon development and concluded that promoting industrial structure adjustment, optimizing energy structure, promoting energy-saving technology, and innovating process structure were the main factors affecting emission reduction.…”

Section: Introductionmentioning

confidence: 99%

Research on the Carbon Reduction Technology Path of the Iron and Steel Industry Based on a Multi-Objective Genetic Algorithm

Xie,

Ma,

Wang

et al. 2024

Sustainability

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This paper establishes a multi-objective optimization model based on an improved NSGA-II algorithm, aiming to study the carbon reduction technology path of specific enterprises in the steel industry under the background of China’s dual-carbon goal and fill the research gap in the carbon reduction technology path of steel enterprises, which has certain guiding significance for the realization of China’s dual-carbon goal and the low-carbon development of steel enterprises. Firstly, through the analysis of the list of extreme energy efficiency technologies in the steel industry and the main process flow of steel industry production, the multi-objective optimization model is constructed from the two objective dimensions of maximum CO2 emission reduction and maximum enterprise economic benefit. Then the improved NSGA-II algorithm is used to solve the model. And the empirical analysis of a Hebei iron and steel enterprise, based on the technology application of enterprises before the release of the technology list, the technology path of enterprises to reduce carbon is predicted. The actual application data of the enterprise is used for verification and analysis, and suggestions on the technical path for the future low-carbon development of the enterprise are provided. The experimental results show that: (1) The optimal solution set of Pareto is consistent with the practical application of enterprises, and the constructed model is accurate and efficient, which can be used for the research of carbon reduction technology path. (2) When introducing technology, enterprises can give priority to the solution of common set technology based on their own needs.

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“…Therefore, it is particularly important to improve the macro-segregation of continuous casting billet during the continuous casting stage. At present, most of the research on carbon segregation in continuous casting billet is focused on central segregation [8][9][10]. For continuous casting billet, a large part is used to replace steel ingots to produce large forgings, which have higher requirements for the performance uniformity of the entire section.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Carbon Segregation in Shaped Billet of Medium Carbon Steel with Combined Electromagnetic Stirring

Li,

Zhang,

Yan

et al. 2023

Materials

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Carbon segregation is the major and classical internal defect in the continuous casting process of carbon steel. Based on the combined electromagnetic stirring equipment for new billet in a steel plant, China, the influence of combined electromagnetic stirring (M-EMS + F-EMS) on the carbon segregation of 300 mm × 340 mm special-shaped billet was studied via numerical simulation and on-site industrialization tests. The Lorentz force and carbon solute distribution were simulated under different EMS parameters. The formation mechanism of the carbon segregation of medium carbon steel with different combined electromagnetic stirring processes was analyzed. The results show that: (1) with the combined action of “solute flushing” effect and gravity, the carbon concentration in the loose side of the medium carbon steel casting billet is gradually lower than the fixed side, while the carbon concentration on the fixed side gradually accumulates more; and (2) under the action of combined electromagnetic stirring, the segregation index of casting billet could be controlled to remain between 0.96–1.05 and shows an increasing change in solidification from the skin to the center. When the current and frequency of M-EMS are 250 A and 2.0 Hz and the F-EMS are 180 A and 8.0 Hz, the carbon segregation defects in the special-shaped (300 mm × 340 mm) casting billet can be significantly improved.

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Improvement of center segregation in high-carbon steel billets using soft reduction

Cited by 16 publications

References 2 publications

Spatial Characterization of Internal Defects in Medium Carbon Steel via X‐Ray Computed Tomography

Spatial Characterization of Internal Defects in Medium Carbon Steel via X‐Ray Computed Tomography

Research on the Carbon Reduction Technology Path of the Iron and Steel Industry Based on a Multi-Objective Genetic Algorithm

Numerical and Experimental Study on Carbon Segregation in Shaped Billet of Medium Carbon Steel with Combined Electromagnetic Stirring

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