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Ren Z.,Zhejiang University | Huang Y.,Zhejiang University | Huang Y.,Hangzhou Iron and Steel Group Company | Shen M.,Zhejiang University | And 5 more authors.
Journal of Non-Crystalline Solids | Year: 2011

Ti5Si3 thin films were coated on glass substrate by atmospheric pressure chemical vapor deposition method at different temperatures. Electrical and corrosion properties of the thin films were investigated. The results show that the electrical resistivity of the thin films decreases initially with the increase in deposition temperature. However, it increases with the further increase of the temperature. The lowest electrical resistivity of 107 μΩ·cm is obtained at 710 °C. The least corrosion rates of the thin films at 95 °C of 0.10 nm/min and 0.13 nm/min in 1 N and 10 N acid solution and of 0.33 nm/min and 6.55 nm/min in 1 N and 10 N alkali solution, respectively, are obtained by weight-loss measurement method. The corrosion mechanisms of the thin films were also discussed in detail. © 2011 Elsevier B.V. All rights reserved. Source


Li P.-H.,Hangzhou Iron and Steel Group Company | Li P.-H.,Zhejiang University | Ye J.-S.,Hangzhou Iron and Steel Group Company | Hu W.-H.,Hangzhou Iron and Steel Group Company | Bao Y.-P.,University of Science and Technology Beijing
Journal of Iron and Steel Research | Year: 2013

Thermodynamics calculation indicates that the stable inclusion is A1 2O3 for Ti-alloyed Al-killed steel. And only when Al content is below 0. 008% does Al2TiO5 emerge. Systematical samples from practical production of Ti-IF steel reveals following discoveries. Unstable Al-Ti composite oxides formed in steel possibly due to the reaction between titanium oxides in ferrotitanium and aluminum in steel. During casting process, the aluminum loss near the melt/slag interface is more sever if the content of reducible oxide such as SiO2 is higher in tundish flux. Therefore Ti enrichment happens in partial areas near the melt and thermodynamic conditions for generating Al2TiO5 or Ti3O 5 could be satisfied. In addition, titanium oxides can be easily transported into steel melt by turbulent flow. Source


Hu W.-H.,Hangzhou Iron and Steel Group Company | Zhu S.-L.,Hangzhou Iron and Steel Group Company
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

The distribution of carbon segregation on casting blank were investigated to reduce carbon segregation and improve deep-drawing property in steel GCr15, using the methods of casting blank drilled and dendritic microstructure analyzed. And the effect of process parameters in continuous casting on carbon segregation was studied through the regressive analysis of the data in producing process. The results indicate that the average degree of carbon distribution can be improved with increase in secondary cooling intensity, and diagonal carbon distribution is more average than vertical and horizontal's in section of GCr15 steel billet; the dendritic distance becomes more and more obvious from exterior to center in casting blank, especially serious in center. And it is helpful to weaken dendritic segregation with increase in secondary cooling intensity. Regressive analysis shows segregation index has maximal relationship with water ratio in secondary cooling, and has low relationship with superheat degree of steel. Source


Hu W.-H.,Hangzhou Iron and Steel Group Company | He G.-H.,Hangzhou Iron and Steel Group Company
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

The effects of different aluminum content in annealed GCr15 drawing steel on the variation of strip texture, microstructure, gain orientation, hardenability n-value, plastic strain ratio r-value and Δr index were investigated under the condition of mass production in Hangzhou Iron and Steel Group Co. Experimental results show that within the range of [Al] s of 0.017%-0.027%, the influence of aluminum on the property of deep-drawing formed GCr15 with high carbon and with low carbon is basically the same. The r-value increases with the increase in aluminum content, while the beneficial texture on {111} also goes up. However, the r-value of GCr15 steel is much less than that in the low-carbon steel with the same degree of aluminum. While n-value remains more or less the same, Δr index is much smaller, and there is some significant difference in grain orientation. All results indicate that GCr15 with high carbon has good properties in the above-mentioned aspect, which can meet the requirements of deep forming for common purposes. Source


Peng Z.,University of Science and Technology Beijing | Bao Y.-P.,University of Science and Technology Beijing | Mei N.,Shougang Jingtang United Iron & Steel Co. | Yang L.-K.,Hangzhou Iron and Steel Group Company | Zhang F.,Hangzhou Iron and Steel Group Company
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2015

A two dimensional coupled model of fluid flow and heat transfer of liquid steel and water in a mold was established to investigate the influence of inlet cooling water temperature and velocity on the mold tube temperature field and average mold heat flux. Solved by Fluent, this model simulated the flow and heat transfer of liquid steel and cooling water, solidified shell growth, and heat transfer across air gap and mold fluxes by conduction and radiation. The model's accuracy was verified by comparing the shell thickness and copper tube temperature field with other researches. Model results suggest that the inlet cooling water temperature notably affects the cold face temperature of the copper tube. If the inlet cooling water temperature exceeds 313 K, the highest temperature of the cold face will surpass the boiling point of water. However, an increase of 0.49 m·s-1 in water velocity can diminish the adverse effects of an increase of 4 K in inlet cooling water temperature. ©, 2015, The Editorial Board of CHINESE JOURNAL OF ENGINEERING. All right reserved. Source

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