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Liu X.-W.,Shanghai Meishan Iron and Steel Co. | Zhao N.,Shanghai Meishan Iron and Steel Co.
Kang T'ieh/Iron and Steel | Year: 2017

The effects of Ti and Nb micro-alloying elements on the microstructure and properties of low-cost 600 MPa grade ferrite-martensite dual phase steel coiled at low temperature were studied by hot rolling trial-production and compared with the dual phase steel coiled at medium temperature. The results showed that the inter-phase precipitation of nanometer (Nb, Ti)C phase mainly distributed along the grain boundaries, synchronously refined the grain size of ferrite and martensite phases, as well as improved the comprehensive strength and plastic properties of the dual phase steel. Thus, it solved the problem of coarse martensite phase formation that existed in the dual phase steel without the addition of Ti and Nb elements. In addition, the modification of the hot rolling process for dual phase steel coiled at medium temperature was proposed under the consideration of its unfavorable characteristics, such as coarse grain size, less martensite content and slightly low strength property. © 2017, CISRI Boyuan Publishing Co., Ltd. All right reserved.

Peng Q.,Shanghai JiaoTong University | Peng X.,Shanghai JiaoTong University | Wang Y.,Shanghai Meishan Iron and Steel Co. | Wang T.,China Resources Power Hunan Co.
Journal of Manufacturing Science and Engineering, Transactions of the ASME | Year: 2015

Laminated steel sheet (LSS) is a novel functional material consisting of two steel sheets sandwiched by an adhesive layer. It has good vibration damping and noise absorption attributed by the middle polymer layer, and structural function owed to the two face steel sheets. Springback is an omnipresent negative phenomenon in metal sheet bending. Experiments and simulations were conducted to analyze the effects of processing and material parameters on springback of a specified LSS for the purpose of process optimization. Various tests including lap-shear, normal tensile, and viscosity analysis were carried out to obtain the mechanical behavior of the polymer layer. A neo-Hookean hyperelastic model was accordingly developed. Tensile tests of the two skin sheets were also implemented for material model. Ninety degree V-bending experiments were fulfilled as a validation on the feasibility and efficiency of finite element method and material models. A following parametric study on 88 deg V-bending of the LSS was then implemented to provide a processing optimization for industry practice. Copyright © 2015 by ASME.

Wang Y.-J.,Beijing Institute of Technology | Wang Y.-J.,Shanghai Meishan Iron and Steel Co. | Zhang Q.-F.,Beijing Institute of Technology | Peng X.-Q.,Shanghai JiaoTong University
Materials Science and Technology Conference and Exhibition 2015, MS and T 2015 | Year: 2015

To investigate the causes of zinc coating peeling off in forming of galvanized DC51D+Z sheet steel, chemical composition and microstructures of the substrate materials of regular and defective samples were compared and analyzed. The microstructures of coating and the surface microscopic morphological characteristics of transition coating were examined. The deformation processes of coating in different bending angles were simulated. The results showed that lean aluminum transition coating was the reason that leads to poor adhesion of coating and peeling off when punched. The low content aluminum of zinc liquid in the zinc pot, the intensified diffuse between iron and zinc in high temperature when the sheet steel entered into the pot and eventually the increased iron-rich phase and the decreased aluminum content of the transition coating at the interface between coating and substrate may be the causes of the lean aluminum transition coating. © Copyright 2015 MS&T15.

Guoguang Z.,Shanghai Meishan Iron and Steel Co. | Husken R.,Kuttner GmbH and Co. KG | Cappel J.,Cappel Stahl Consulting GmbH
Stahl und Eisen | Year: 2012

TBM bottom stirring is a technology introduced worldwide to enhance the metallurgical efficiency of the BOF process. By applying this technology inert gas injection through the bottom of the BOF vessel enhances the mixing effect of the top lance blowing jet. Slag Splashing was introduced in BOF operations to increase vessel campaign life, but generally it negatively impacts the efficiency of the bottom stirring. At Meishan Steel in China an operation practice was developed that successfully combines the advantages of both technologies.

Wang D.-G.,Shanghai Meishan Iron and Steel Co. | Wang D.-G.,Control Iron and Steel Research Institute, China | Li J.,Anhui University of Technology | Xia Y.-J.,Anhui University of Technology | And 2 more authors.
Journal of Iron and Steel Research | Year: 2016

The effect of A12O3 content on CaO-SiO2-A12O3-Fc2O3 slag quaternary system slag melting point and viscosity was calculated by Factsage software, and the effect of Ca0SiO2-A12O3-Fe2O3 slag system on the dephosphorization behavior of high phosphorus hot metal was studied by experiment at 1 400 The results show that when the A12O3 content varies from 3% to 6% , the slag melting point decreases rapidly with the increase of A12O3 content, hut with further increase of A12O3 content in slag, the slag melting point increases gradually. The Al2O3 content has little effect on the viscosity of Ca0-SiO2-Al2O3-Fe2O3 slag. When the A12O3 content varied from 3% to 6%, the slag dephosphorization ability changes little, and dephosphorization rate remains at about 91%, but dephosphorization ability decreases gradually with the further increase of A12O3 content. The A12O3 content maybe affect the slag dephosphorization ability by changing the liquid phase proportion of slag, thereby affecting the mass transfer of phosphorus from hot metal to liquid slag.

He Z.-M.,Shanghai Meishan Iron and Steel Co. | Wang J.-L.,Shanghai Meishan Iron and Steel Co. | Chen J.,Shanghai Meishan Iron and Steel Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2011

The uncertainty source for the determination of nitrogen in steel by inert gas fusion-thermal conductivity method was detailedly analyzed. The main uncertainty components in determination process (sample weighing, certified reference material, measurement repeatability, instrumental resolution ratio and calibration) were reasonably evaluated. The expanded uncertainty of measurement results was obtained through multiplying the combined standard uncertainty by 2 (expanded factor under confidence probability of 95%). During the evaluation process of uncertainty, it was found that the certified reference material and measurement repeatability had the highest influence on the combined standard uncertainty. Therefore, the selection of proper standard sample curve calibration should be paid much attention in measurement, and the results should be calculated after repeated determination.

Yan X.-Q.,University of Science and Technology Beijing | Wu X.-F.,University of Science and Technology Beijing | Yang X.-E.,Shanghai Meishan Iron and Steel Ltd Company | Wu S.-T.,Shanghai Meishan Iron and Steel Ltd Company | Xu J.-Z.,Shanghai Jiushi Company
Gongcheng Lixue/Engineering Mechanics | Year: 2014

In recent years, with the development of modern rolling mill equipment level, rolling mill vibration becomes more and more outstanding and diverse and has become a worldwide problem needed to solve in the rolling field. After the vibration test of an ASP hot strip mill made in AnSteel, a CSP hot strip mill made in an SMS company and a FTSR hot strip mill made in a Danieli company, we find that the frequency of a rolling mill torsional vibration and is identical with that of an axial vibration. In order to explain this phenomenon of mill axial vibration, the paper conductes a computer simulation analysis by an ANSYS finite element harmonic response analysis module, and the conclusion is obtained that the torsional vibration and axial vibration will produce the phenomenon of coupled vibration under certain conditions, which provides the theory basis for the design of rolling mill coupling dynamics.

Bian X.,Nanjing University of Technology | Wang Q.,Nanjing University of Technology | Wang X.,Nanjing University of Technology | Wang X.,Shanghai Meishan Iron and Steel Co. | And 4 more authors.
RSC Advances | Year: 2016

Bimetallic alloy is more effective than pure metal for controlled growth of high-quality graphene. In this work, we used the DFT-D2 method to study interfacial structure, interaction between graphene layers and bimetallic Ni/Cu(111) surface and near-surface alloys (SAs, NSAs). The results show that the bimetallic Ni/Cu(111) SAs and NSAs have a larger surface relaxation and charge transfer at the interface. The Ni/Cu(111) SAs/NSAs with a Cu-surface layer are energetically more favorable than that with a Ni-surface layer. However, the Ni-surface layer of the Ni/Cu(111) SAs/NSAs has more charge accumulation and higher chemical activity than the Cu-surface layer of the Ni/Cu(111) SAs/NSAs. More importantly, the interaction strength of graphene-metal can be distinctly tuned by surface alloying, while it has only a minor change by subsurface alloying. The initially weak interfacial interaction of graphene/Cu(111) could be enhanced substantially by Ni surface introduction. Accordingly, the interface distance was decreased from ∼3.0 Å to ∼2.1 Å, and there is a strong charge transfer from the Ni-surface layer to the graphene bottom layer. In contrast, the initially strong interfacial interaction of graphene/Ni(111) could be reduced successfully by Cu surface introduction. The interface distance was increased from ∼2.1 Å to ∼3.0 Å, and there is only a minor electronic polarization at the interface between graphene and Ni(111)-Ni-Cu SA. Furthermore, the graphene bottom layer on the Ni-surface layer of the Ni/Cu(111) SA/NSAs has higher chemical activity than that on the Cu-surface layer of the Ni/Cu(111) SA/NSAs. These findings provide a useful guide for designing alloy catalysts and achieving controlled growth of graphene. © The Royal Society of Chemistry 2016.

Wang Y.,Shanghai Meishan Iron and Steel Co. | Shen Q.,Shanghai Meishan Iron and Steel Co. | Liu X.,Shanghai Meishan Iron and Steel Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2013

F0 work roll was exploded and fractured in a hot rolling mill. The primal inspection of the roll before first application was checked, and the fractured roll surface and the residual fragments were observed, and the hardness test, microstructure and electron microscope analysis were carried out on the fractured roll. The results show that the fracture of the roll suffers from a short cycle rolling and crack propagation period, large amounts of abnormal heat fatigue cracks appear on the roll surface, the uniformity of hardness of the roll is poor, growth direction of fish bone shape carbide in outside working layer is inclined to the roll center. As a result, the cracks are propitious to expand to the center, and the abnormal microstructure and casting defects appear in the transition layer of the roll, which form primal cracks and accelerate the cracks to propagate, finally, parts of the outside working layer are flaked away and the roll explodes.

Pei X.,Northeastern University China | Pei X.,Shanghai Meishan Iron and Steel Company Ltd | Shuai T.,Northeastern University China
Materials Science and Technology Conference and Exhibition 2014, MS and T 2014 | Year: 2014

In this paper, the physical metallurgy behavior of Ti containing high strength steel sheet under intensive cooling process after hot-rolling was studied. The results show that the intensive cooling broaden the bainite transformation field. The phase transformation incubation period are shorten and the CCT curve moves to bottom left. Compared with that under conventional laminar cooling, the hot rolled sheet under intensive cooling has finer grain size microstructure and more acicular ferrite. The intensive cooling after hot-rolling also promotes the precipitation of (Nb,Ti)(C,N) carbonitrides of 20nm or less. The strength of a 600MPa Ti containing high strength steel can be prompted to a higher level of 700MPa. The toughness and elongation of the steel sheet keep good performance as the strength increase. Copyright © 2014 MS&T14®.

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