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Authors: ZUO Haibin, HONG Jun, ZHANG Jianliang, SHEN Meng, TIE Jinyan
The 1:1 thermal tests are carried out, including the naked cooling stave and cooling stave with 20 mm slag skull, in order to determine the actual cooling performance of the nodular cast iron cooling stave produced by lost foam casting (LFC) process. Heat resistance analysis method is also used to calculate the integrated heat transfer coefficient between cooling water and cooling stave.
Authors: Jun Hong, Hai-bi1n Zuo, Jian-liang Zhang, Meng Shen, Jin-yan
The three-dimensional steady-state heat transfer model of a cast iron cooling stave is built based on the commercial CFD software FLUENT, to calculate the temperature field of the cooling stave with circular pipe as well as elliptical pipes. Cooling effects of different kinds of elliptical pipes are analyzed. The results show that compared with a circular cross section, the elliptical cross section can increase the circumference of the cooling pipe under the same water velocity and the same cross-sectional area, thereby increasing cooling ability of the stave.
Authors: Potapov A. A, Orlov G. A, Shestakova E. N
The article present high-carbon hypereutectoid steel for the production of hot rolling forged rolls. The steel contains 1.2 - 1.4 % carbon, carbide forming alloying elements Cr, Mo, V and Nb to improve the wear resistance of the roll, and Ni to increase the hardenability. Hot ductility of the steel has been investigated considering segregation of chemical elements in ingots weighing up to 20 tons.
Authors: Zhe WANG, Tao YU, Run-bo WANG, Bing GAO
In this paper, the effect of semicharcoal property on sinter performance was investigated by using pot-grate sintering test. Emphasis was mainly focused on the influence of the substitution ratio and particle size on sinter productivity and quality.
Authors: Gao Bing, Zhang Jianliang, Zuo Haibin, Wang Zhe, Wang Peng
Two kinds of stamp charging coke and two kinds of top charging coke were chosen and the microstructures and properties were investigated. It is shown that stamp charging cokes were more easily to react with C 0 2 at high temperature. Without alkalis, the weight loss ratio of stamp charging cokes were obviously more than top charging coke.
Authors: Liang-cai Zhong, Huang Li, Shan Wei, Bo-yu Chen, Can-rong Wang
A kinetic model of desulfurization with magnesium injection from hot metal was built and the unknown kinetic parameters in this model, that is, volumetric mass transfer coefficients of sulphur and magnesium, Vs and VMg, and magnesium dissolution mass fraction, RMs were determined by a try and error method with industrial data in a steelmaking plant.
Authors: Jiao Ke-xin, Zhang Jian-liang, Zou Hai-bin, Guo Jian, Zheng Changle
The life of blast furnace would be shorten if the soft water couldn't be controlled strictly. The blast furnace cooling water for different regions of A, B, C were studied.
Authors: Wei Liu, Jingshe Li, Hongbo Yang, Shufeng YangR, Xiangzhou
A 3D transient numerical model of molten steel and compressible oxygen flow in a top blown converter has been built using CFD software. The geometric details and the coalescence of multiplejets were considered. The effect of oxygen pressure on oxygenjet and molten steel flow was analyzed comprehensively by the model. The simulation results show that the Mach number and high-speed range of the oxygen jets increase with oxygen pressure rising.
Authors: Wanliang Yang, Jingshe Li, Jiangshan Zhang, Yang Wang
The ladle shroud can also play as a flow control device in tundish. Water modelling and Reynolds-average modelling were employed, but not very suitable to describe the turbulent flow with strong instant velocity variations and high-energy dissipation in the ladle shroud.
Authors: Xiao-jie GAO, Jing-she LI, Cheng-song LIU, Shu-feng YANG
In this study, different trials using tracers were performed to investigate the source of slag inclusions in SPHC steel grade. Among Macro-inclusions by electrolysis in different trials, a large amount of Ba , which was added in LF refining slag, has been detected in macro-inclusions of LF refining, while little of that was found in tundish and continuous casting slab.