Jigang Group Co Ltd

Jinan, China

Jigang Group Co Ltd

Jinan, China
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Sun W.H.,Jigang Group Co. | Li H.C.,Jigang Group Co. | Li H.C.,University of Wollongong | Tieu A.K.,University of Wollongong
Advanced Materials Research | Year: 2014

The MMS-2B wear machine was used to study abrasion wear of work rolls in cold rolling by simulating emulsion cooling during the cold rolling process. The work roll materials used were 4%Cr, same as those in industrial production. The surface SEM scanning photographs were taken every 30 minutes until the friction experiment finished, and erosive appearance of emulsion on the work roll surface could be seen in the photos. The corrosive wear of the work roll surface is discussed. Findings show that the main causes of stress corrosion and pitting corrosion are uneven microstructure on the work roll surface and a large number of dislocation accumulations, which form microscopic cells. Water in steel rolling emulsion is the main conductive medium of electrochemistry reaction, and this intensifies the corrosive wear. © (2014) Trans Tech Publications, Switzerland.

Yang Z.,Shandong Polytechnic University | Xing J.,Jigang Group Co. | Wang X.,Shandong Polytechnic University
2011 International Conference on Electrical and Control Engineering, ICECE 2011 - Proceedings | Year: 2011

This article explains how to improve the traditional workflow process meta-model, and then proposes the improved knowledge flow model on the traditional model. Elaborates further on the combination of workflow technology and knowledge flow, and how to be used this in enterprise knowledge management system. © 2011 IEEE.

Liu X.,Jinan Vocational College | Feng F.,Jigang Group Co Ltd
Energy Education Science and Technology Part A: Energy Science and Research | Year: 2014

The coding efficiency of H.264/AVC standard is improved twice as large as that of MPEG-2 standard, yet its computational complexity is also greatly increased. Coupled with the real-time computing constraints in the actual application environment, the hardware implementation of H.264/AVC decoding chipset is a huge challenge. Based on H.264/AVC SoC platform solution, a reconfigurable intra prediction decoder is proposed in this paper. All the parallel arithmetic units are concentrated in a computing module, and the input data of the computing module are controlled in different modes, respectively, to achieve the reconfigurable architecture of predictor. Meanwhile, four parallel modules of the same structure are adopted to improve the processing capacity, so that the predicted values of four pixels can be generated simultaneously. Simulation results show that the design is very suitable to be integrated into H.264/AVC decoding chipset. © Sila Science. All rights reserved.

Wang L.-M.,Control Iron and Steel Research Institute, China | Zhang H.,CAS Technical Institute of Physics and Chemistry | Liu N.,Jigang Group Co. | Liu Z.-D.,Control Iron and Steel Research Institute, China | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Hot compression experiments on three high-alloy martensitic heat-resistant steels of 0Cr11Ni2MoVNb, 1Cr20Co6Ni2Mo1WV and 403Nb were carried out by using a Gleeble-3500 simulator. The results show that the apparent activation energy for hot working of these alloys is 461.6 kJ/mol, 508.1 kJ/mol and 571.1 kJ/mol, respectively. Comparing this work with other researches', it can be concluded that the main factor affecting the apparent activation in steels is carbon and alloy element content. For plain steels and micro-alloyed steels, because the amount of alloy elements is small and the carbides formed are also few, the carbon content has no obvious effect on the apparent activation energy. However, for high-alloy steels, because the carbides, especially the thin NbC particles have a drag effect on dislocations and alloy elements have solid solution strength effect, the apparent activation energy increases with the increasing of content of carbon and alloy elements.

Yang L.,Dalian Maritime University | Zhong J.-J.,Dalian Maritime University | Han J.-A.,Dalian Maritime University | Meng L.-L.,Jigang Group Co.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2012

The three dimensional Reynolds-averaged Navier-Stokes equations and the Spalart-Allmaras turbulent model are adopted to simulate numerically a flow field of the three dimensional flow-path of the ram-rotor with two kinds of throat contract ratio and five kinds of strake stagger angle. It has been found that the throat contract ratio can affect the shock wave structure and performance obviously. The flow speed is subsonic when the throat contract ratio is larger. The ram-rotor has higher adiabatic efficiency, total pressure ratio and static pressure ratio when the throat contract ratio is lower. With the increasing of the strake straggle angle, the flow angle and the total pressure ratio decrease. In order to improve the overall performance and the flow field structure of the ram-rotor, the reasonable compromises should be made among the adiabatic efficiency, the total pressure ratio, the flow angle, the mass flow rate, the width of the ram-rotor, and so on. Case with throat contract ratio 0.6 and strake stagger angle 12° has the optimal configuration in the study of this paper.

Mu L.,Shandong University | Shi J.,Shandong University | Li X.,Jigang Group Co.
Advanced Materials Research | Year: 2012

Impact loads in large iron and steel enterprise bring the power system reactive power impact, which makes the fluctuation of the system voltage, power factor and other parameters are out of the limitation of the national standard. Substation bus reactive load forecasting in large iron and steel enterprise can be introduced to determine reactive power optimization strategy and the switching of capacitors. In this paper, a combination forecasting model of quadratic self-adaptive exponential smoothing (QSES) model and converse exponential (CE) model has been proposed for substation bus reactive load forecasting. The numerical results in Jinan iron and steel Group show the application of this model is encouraging. © (2012) Trans Tech Publications, Switzerland.

Zhou C.,Taiyuan University of Science and Technology | Liu H.,Jigang Group. Co. | Huang Q.,Taiyuan University of Science and Technology
Advanced Materials Research | Year: 2011

The higher the output of high-strength plate is, the higher the demand flatness of users will be, but there are some questions in designing high-strength plate leveler now: the first is no enough conditions in traditional parameters calculation formula, the second is neglection of elastic recovery in elastic-plastic bend deformation in plate leveling process. This research, which aims to level plate with yield strength 1200MPa, will amend traditional analytic formula and calculate leveler roller pitch and roller diameter, and can help design the high strength plate leveler. © (2011) Trans Tech Publications.

Yang Z.Y.,Shandong Polytechnic University | Xing J.,JiGang Group CO. | Wang X.G.,Shandong Polytechnic University
Applied Mechanics and Materials | Year: 2012

Slot partial competitive (SPC) anti-collision algorithm is based on the ISO/IEC18000-6C UHF radio frequency identification (RFID) standard, which introduces dynamic binary tree search technology into the competitive collision avoidance mechanism. Moreover, the SPC algorithm applies the specific technologies to idle slots and collision slots. This paper proposes a segment slot partial competitive (SSPC) anti-collision algorithm based on the SPC, and introduce the segment algorithm. The performances of the dynamic binary tree search, the SPC algorithm and the SSPC algorithm are compared via simulation experiments. Simulation results indicate that the SSPC algorithm is improved significantly. © (2012) Trans Tech Publications, Switzerland.

Sun W.H.,Jigang Group Co. | Bi Z.C.,Jigang Group Co.
Advanced Materials Research | Year: 2014

This paper introduces the study and production on steel plate of Grade E550 in 60mm thick by Thermo-mechanical processing (TMCP) and tempering for offshore infrastructure purpose. The steel plate obtained high strength and good toughness in both the base materials and the weld joints. Microstructure and precipitation characteristics were examined in the plate is comprised of bainite with a small amount of pre-eutectoid ferrite. Parallel arranged lath bainite characterizes the bainitic structure with high density of dislocations and precipitates. Carbides MxCy averaging 200nm in dimension and MC type Carbonitrides in several nano to a dozen nano carbides distribute in the bainite ferrite and the bainte lath interfaces. Compatible mechanical properties were achieved at welded joint. Microstructures were analysed in the welding heat affected zone (HAZ). © (2014) Trans Tech Publications, Switzerland.

Zhu H.,Shandong University | Shi J.,Shandong Jianzhu University | Liang L.,Jigang Group Co.
Advanced Materials Research | Year: 2012

The iron and steel industry annually consumes about 10% of electricity in China, while the utilization efficiency is relatively low. A two-step energy-saving method for steel enterprise is proposed in this paper. The production plan is regulated to minimize the energy utilized in steel rolling. The electrical load is forecasted according to the optimized steel-rolling plan and the reactive power is compensated to minimize the active power loss and voltage fluctuation. Practical application in Jigang Group Co., Ltd shows the efficiency of the proposed method.

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