Hangzhou Iron and Steel Group Company

Hangzhou, China

Hangzhou Iron and Steel Group Company

Hangzhou, China
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Zhu S.,Zhejiang University of Technology | Zhu S.,Hangzhou Iron and Steel Group Co. | Cao H.,Zhejiang University of Technology | Hu W.,Hangzhou Iron and Steel Group Co. | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

High speed steels W6Mo5Cr4V2 with different contents of rare earth magnesium were smelt and moulded and then the steels were annealed and forged. Microstructures of the samples were observed and the properties at high temperature were investigated by the thermal simulator Gleeble. The results show that reticulation carbide structures are ruptured by the addition of rare earth magnesium to the moulded steel W6Mo5Cr4V2. With the increasing of rare earth magnesium contents and forging reductions, the degree of granulation for carbide is improved. Thermal simulation results indicate that the first high temperature brittleness area lies in the range from melting point down to 1180 ℃, and the second high temperature brittleness area is between 950 ℃ and 800 ℃; however, the comprehensive high temperature ductility area is very narrow, which is from 1170 ℃ to 1190 ℃.


Zhu S.-L.,Zhejiang University of Technology | Zhu S.-L.,Hangzhou Iron and Steel Group Company | Cao H.-Z.,Zhejiang University of Technology | Ye J.-S.,Hangzhou Iron and Steel Group Company | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2015

Hot compression deformation behaviors of medium carbon Cr-Ni-Mo-Nb steel were investigated at deformation temperatures ranging from 1223 to 1423 K and strain rates of 0.1, 1 and 5 s-1. Dynamic recovery (DRV) and dynamic recrystallization (DRX) were observed during the hot compression deformation. For all of the samples, DRX occurred at deformation temperatures above 1323 K at different strain rates, while below 1223 K, no DRX was observed. The activation energy of the tested steel was determined as 386.06 kJ/mol. The ratio of critical stress to peak stress and the ratio of critical strain to peak strain were 0.835 and 0.37, respectively. Kinetic equations interpreting the DRX behavior of the tested steel were proposed, and the corresponding parameters including the volume fraction and the average grain size were determined. Moreover, the microstructures induced under different deformation conditions were analyzed. © 2015 Central Iron and Steel Research Institute.


Zhu S.-L.,Zhejiang University of Technology | Zhu S.-L.,Hangzhou Iron and Steel Group Co. | Zheng G.-Q.,Zhejiang University of Technology | Ye J.-S.,Hangzhou Iron and Steel Group Co. | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

The relationship between spraying intensity and casting parameters was derived during secondary cooling of continuous casting, and the solidification structures of billets with two different sections were compared under different spraying intensities. The results showed that it was more accurate to express the relationship between solidification structures of billet and cooling parameters by using spraying intensity. Dendrite arm spacing was about 20 μm in the surface of billets and about 200-350 μm in the centre. The dendrites in diagonal area were tinier than those in lateral area at the same distance from surface of billet. Under the similar spraying intensity, the rules of solidification for billets showed that the structures in centre area were tiny for billets with cross-section of 200 mm×200 mm, but tiny structures existed in areas close to centre for billets with cross-section of 150 mm×150 mm. During solidification of billets, the left curve of solidification laws was obeyed basically from surface to center, but it was the right curve for centre area and areas close to centre when the cross-sections of billets were larger than 200 mm×200 mm.


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 Co. | Zhang F.,Hangzhou Iron and Steel Group Co.
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.


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.


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.


Hu W.-H.,Hangzhou Iron and Steel Group Co. | Zhu S.-L.,Hangzhou Iron and Steel Group Co.
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.


Hu W.-H.,Hangzhou Iron and Steel Group Co. | He G.-H.,Hangzhou Iron and Steel Group Co.
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.


Peng Z.,University of Science and Technology Beijing | Bao Y.-P.,University of Science and Technology Beijing | Chen Y.-N.,University of Science and Technology Beijing | Yang L.-K.,Hangzhou Iron and Steel Group Co. | And 2 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2014

An unsteady, two-dimensional, explicitly solved finite difference heat transfer model of a billet caster was presented to clarify the influence of the thermal conductivity of steel on model accuracy. Different approaches were utilized for calculating the thermal conductivity of solid, mushy and liquid steels. Model results predicted by these approaches were compared, and the advantages of advocated approaches were discussed. It is found that the approach for calculating the thermal conductivity of solid steel notably influences model predictions. Convection effects of liquid steel should be considered properly while calculating the thermal conductivity of mushy steel. Different values of the effective thermal conductivity of liquid steel adopted could partly be explained by the fact that different models adopted dissimilar approaches for calculating the thermal conductivity of solid and mushy steels. © University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2014.


Li S.-Z.,Hangzhou Iron and Steel Group Company | Ye J.-S.,Hangzhou Iron and Steel Group Company | Li P.-H.,Hangzhou Iron and Steel Group Company | Hu W.-H.,Hangzhou Iron and Steel Group Company
Journal of Iron and Steel Research | Year: 2013

The size distribution of inclusions between 1 to 100μm in diameter was obtained by middle size sample electrolysis combined with laser grain size analyzer, which provided a method to measure the size of inclusions ranging from 20 to 80μm. It s observed that the major inclusions, of which size is from 1 to 100μm, are SiO2type in IF steel. The content of inclusions larger than 30 μm is up to 4.25%, which would be a significant potential threat to the surface quality of cold-rolled steel products.

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