Papers by Author: Cui Ma

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Authors: Fei He, Xiao Chen Wang, Zhi Guo Liang, Cui Ma
Abstract: In the hot strip rolling production process, mechanical properties are detected offline. The process data is used for clustering analysis to acquire the state in advance. During the mechanical properties detection, the outliers in the same steel grade are regarded as the focal points. Spectral clustering is one of the advanced methods, where the Euclidean distance as the common similarity measure, can only extract the features of the spherically distribution data and can not express the complex distribution data. In this paper geodesic distance is introduced to spectral clustering, which is used to do the production state clustering. The Tennessee Eastman and hot strip rolling process data are used for model validation, as a result the proposed method has better performance on clustering, compared with the Euclidean distance.
Authors: Hai Yu Liu, Jing Li, Cui Ma
Abstract: From a global point of view, advocating EAF steelmaking means reducing the consumption of resources like iron ores, coke, water and so on and on the same time cutting down the emission of carbon dioxide and residue, which is good for the environment and corresponding to Sustainable Development Strategy. We hold that considering the shortage of electric power and scrap steel in our country, the application direction of EAF steelmaking should be manufacture of quality steel with high additional value and reducing operation cost by shortening smelting period. This paper, aimed at NISCO, GISE-ZIS and AISG who take shortening smelting period as the core subject, hot metal charging technology in EAF and coherent oxygen lance technology as effective technical measures, optimizing process flow, improving product quality and reducing operation cost as purpose; investigates their experience in developing modern EAF steelmaking technology.
Authors: Min Wang, Yan Ping Bao, Quan Yang, Fei He, Xiao Chen Wang, Cui Ma, Zhi Guo Liang
Abstract: This paper studied the distribution of defects by ultrasonic testing and the source of the defect was verified by SEM/EDS. The results showed that the defects mainly distributed in inner and outer sides closed to the surface of the slabs. The number of the defects in inner side was 1.5~2 times of that in outer side. A window 40mm×180mm inclusion band in 1/8 of the inner side existed. The defects in hot-rolled plate mainly formed due to the bad plasticity and deformability inclusions, such as Al2O3, SiO2 and MgO·xCaO. So decreasing the inclusions in slab was important to decrease the defects in hot-rolled plate.
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