Baotou Iron & Steel Group Co.

Baotou, China

Baotou Iron & Steel Group Co.

Baotou, China
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Wu M.,BERIS Engineering and Research Corporation | Zhao X.,Baotou Iron & Steel Group Co. | Dong J.,Baotou Iron & Steel Group Co. | Tan X.,Baotou Iron & Steel Group Co. | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2017

Hot compression deformation of non-annealed cold heading steel SWRCH35KM with RE micro-alloyed was carried out on Gleeble-1500 thermal mechanical simulator to research continuous cooling transformation rule and microstructure evolution. The results show that Ferrite and pearlite transformation happens in cooling rate range of 0.1-25℃/s, and Spheroidization behavior occurs in fine pearlite colony at cooling rate of 0.1-0.2℃/s. When the cooling rate is over 2℃/s, acicular ferrite and widmannstatten are observed. To obtain the microstructure of on-line spheroidized pearlite dispersed in fine and uniform ferrite matrix, step cooling strategy should be adopted in Stelmor cooling line. High cooling rate of over 2℃/s is benefit to restrain large proeutectoid ferrite from laying temperature to 750℃. Cooling rate should be 1-2℃/s at temperature range of 750-680℃ to avoid widmannstatten and acicular ferrite. Then cooling rate should be lower than 0.2℃/s at temperature range of 680-640℃ to improve on-line spheroidization of pearlite. © 2017, Editorial Office of "Jinshu Rechuli". All right reserved.


Fang Q.,Inner Mongolia University of Science and Technology | Fang Q.,Key Laboratory of Integrated Exploitation of Bayan Obo Multi Metal Resources | Li C.-L.,Baotou Iron & Steel Group Co. | Bai H.-R.,Inner Mongolia University of Science and Technology | And 5 more authors.
Chinese Rare Earths | Year: 2015

Effects of La on austenite grain growth behavior and room temperature microstructure of high niobium steel were studied through tube furnace, optical microscope (OM) and scanning electron microscopy (SEM). The main experimental parameters were heating temperature 1250℃ and holding time 20 h. After heating, the samples were quenched by ice brine or slow cooling in furnace. Results show that with increase of RE content, austenite grain growth is inhibited and the original austenite grain size decreases from 146.5 μm to 70.2 μm. Furthermore, the microstructure of slow cooling in furnace is improved, the grains are fine and uniform and the average ferrite grain size decreases from 27.3 μm to 17.4 μm. The results provide theoretical basis for application of La in high niobium steel. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.


Sun P.,Inner Mongolia University of Technology | Hou Z.,Inner Mongolia University of Technology | Yue C.,Inner Mongolia University of Technology | Yue C.,Baotou Iron & Steel Group Co. | And 2 more authors.
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2016

The optimization method combining finite element analysis and genetic algorithm was put forward from the perspectives of engineering to solve the extreme value optimization problem of complex and multivariable structure performance of wind turbine blade. According to mechanical property of composite laminated plate, the mathematical relation between ply thickness of single layer and principal stress of laminate plate was deduced. The improved genetic algorithm was designed to obtain the optimization flow process. Taking certain 1.5 MW wind turbine blade as the object and the maximum principle stress as optimizing objective function, the ply thickness was optimized to obtain the optimum range of ply thickness for different blade part. The results show that the maximum principal stress and strain of optimized blade are reduced obviously, the structure performance is improved evidently, and the correctness and effectiveness of the optimizing scheme and method are verified. © 2016, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.


Sun P.,Inner Mongolia University of Technology | Ma K.,Inner Mongolia University of Technology | Yue C.,Inner Mongolia University of Technology | Yue C.,Baotou Iron & Steel Group Co. | Li J.,Inner Mongolia First Machinery Group Co.
International Journal of Simulation: Systems, Science and Technology | Year: 2016

Motivated by solving the extreme value optimization problem for complex multivariable structure, the ply optimization method of composite wind turbine blade was researched. According to the mechanical properties of composite laminated plate, the mathematical relation between lamination thickness and principal stress was deduced. The optimized mathematics model and the genetic algorithm were designed correspondingly. Taking blades of 1.5MW wind turbine as a research object, and the maximum principle stress and the maximal placement as optimizing objective function, the optimized ply thickness ranges in different blade parts were obtained by thickness optimization using finite element analysis and genetic algorithm. Referring to the practical fact, the ply sequence was redesigned and re-optimized at different blade parts by experimental design method. The results of structure analysis have shown that the effectiveness factor, maximum principal stress and strain of the optimized blade are obviously decreased. The correctness and effectiveness of the optimization method are therefore verified. © 2016, UK Simulation Society. All rights reserved.


Li C.-L.,Baotou Iron & Steel Group Co. | Li X.-G.,Baotou Iron & Steel Group Co. | Xu G.-Y.,Baotou Iron & Steel Group Co.
Chinese Rare Earths | Year: 2015

The article mainly introduced series of new processes such as Baiyun Obo oxidized ore comprehensive recycling beneficiation process, niobium-titanium ferroalloy smelting process, high-purity scandium oxide extraction, the process of making anhydrous hydrofluoric acid by in self-produced fluorite ore concentrate, potassium-rich slate comprehensive utilization process and thorium recovery process. It described the key technology of the comprehensive utilization of niobium, scandium, fluorine, potassium, thorium, titanium and other important elements. In strong support of "State Model Base" platform and "Yellow River into the Baiyun Obo" pipeline project, Baiyun Obo resource comprehensive utilization industrialization projects have been built successfully. The project will achieve the comprehensive recovery of six kinds of concentrate products of iron, rare earths, niobium, scandium, fluorite and sulfur, among which niobium is used to smelt niobium-titanium ferroalloy for the production of high strength low alloy steel, scandium concentrate is used to extract high-purity scandium oxide for the production of solid oxide fuel cell and Sc-Mg-Al alloy lightweight materials, fluorite is used to produce anhydrous hydrofluoric acid and thoria reserve for nuclear energy development. Baogang will continuously optimize mineral smelting process and extend industrial chain including niobium, scandium, fluorine deep processing and comprehensive utilization of potassium by the projects. At the same time it has very important significance for the tailings emissions reduction, environmental protection, broadening of enterprise development direction, increasing economic benefits and the national resources as well as energy security, etc. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.


Zhou L.-Y.,University of Science and Technology Beijing | Zhou L.-Y.,Baotou Iron & Steel Group Co Ltd | Cui T.-H.,University of Science and Technology Beijing | He J.-Z.,Baotou Iron & Steel Group Co Ltd | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

The crack initiation and propagation in process of SPCD steel plate stamping was observed by SEM and EBSD, and the main reason leading to the cracking was investigated. The results show that in situation that the micro texture is advantageous to the plastic potential, the carbide separates out cracks early than the ferrite, and micro crack first occurs in the junction of the ferrite and separated carbide; because of the plasticity of ferrite matrix and the carbide precipitation is different as well as uncoordinated deformation, stress concentration is easy to occur on the interface between two phases, which provides a channel for crack propagation, and carbide is attractive for the crack propagation. Separated carbide whose size is bigger than 20 μm has a strong impact on the plastic of deep drawing sheet and the nonuniform size of ferrite grain causes the local buckling along a wavy path and bigger roughness on the surface of deep drawing sheet after deep drawing, and then causes the "orange peel" characteristics. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


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Baotou Iron & Steel; Group Co. | Date: 2010-05-11

Steel sheets; steel tubes; railway points; steel wire; rivets of metal; flanges of metal; casks of metal.

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