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Jiang Z.Y.,University of Wollongong | Tang J.,University of Wollongong | Sun W.,Jinan Iron and Steel Co | Tieu A.K.,University of Wollongong | Wei D.,University of Wollongong
Tribology International | Year: 2010

In this paper, the effects of the flow stress of the scale and steel, and the friction coefficients at the scale-steel and the roll-scale interfaces on the final surface roughness have been studied. The surface roughness increases for both oxide scale and steel with an increasing friction coefficient at the roll-scale interface. However, the roughness increment is limited. The calculated roughness is close to the measured value. The temperature affects the scale roughness transfer, and the maximum difference is about 25% when the temperature is 850-1025 °C for rolling speeds 0.12-0.72 m/s. The developed model is applicable in hot strip mills. © 2010 Elsevier Ltd. All rights reserved.


Shang C.,University of Science and Technology Beijing | Wang X.,University of Science and Technology Beijing | Xia D.,Jinan Iron and Steel Company | Sun W.,Jinan Iron and Steel Company
Energy Materials 2014, Conference Proceedings | Year: 2014

High grade pipeline steel which is based on multi-phase microstructure concept has excellent mechanical properties, such as large uniform elongation, low yield ratio and low strain aging sensitivity. The results of industrial trial show that the multi-phase X90/X100 pipeline plate steels and longitudinal submerge arc welded linepipe have excellent advantages of lower yield ratio, larger uniform elongation, and less fluctuation of both yield and tensile strength, and the X90/X100 pipes also have a lower strain aging sensitivity. The excellent mechanical properties of multiphase X90/X100 linepipe can meet the restrict requirement for the future more safety and high efficiency design and construction of pipeline project.


Shi J.,Shandong Jianzhu University | Yin D.,State Grid Corporation of China | Yang G.,Jinan Iron and steel Co.
2014 10th International Conference on Natural Computation, ICNC 2014 | Year: 2014

Based on the mathematical analysis of the rolling process, an optimal load distribution model is established. The total energy consumption is to be minimized by adjusting rolling parameters. The equipment and rolling process constraints are taken into consideration. An improved particle swarm optimization algorithm is employed to get the optimal rolling parameters. The simulation results on a six-frame strip demonstrate that the proposed method is efficient. The experiment in Jinan Iron & Steel Group shows the feasibility of the rolling parameter optimization model and solving method. © 2014 IEEE.


Mao W.,University of Science and Technology Beijing | Yu H.,University of Science and Technology Beijing | Sun W.,Jinan Iron and Steel Co.
Advanced Materials Research | Year: 2011

The evolution of microstructure and texture due to recrystallization was investigated in cold rolled interstitial free (IF) steel. Samples taken from the cold band of a 0.07%Ti bearing IF steel with total cold rolling reduction of 75% were investigated by using optical microscopy, X-ray diffraction and electron back-scattered diffraction etc. The aim of this study was to obtain a real picture of the formation of the recrystallization texture of IF steel, which would contribute to proper texture control for improving deep drawability. The mechanism responsible for the evolution of texture is discussed experimentally from four aspects. First of all, the microstructure of partially annealed cold rolled specimen is obtained. The recrystallized grain form earlier in more darkly etched regions from the micrographs, which belong to the ND//<111> fiber components. In addition, the fractions of the {111}<110> and {111}<112> components increase slowly during the early stage of recrystallization, because the γ-fiber recrystallized texture is growing, while at the same time the γ-fiber deformed texture is being consumed. Moreover, The texture formation has been discussed taking into consideration of the stored energy and the misorientation between the orientation of the recrystallized grain and that of the surrounding deformed matrix. The work indicates that the recrystallized grains, which migrate into the deformed grains, are mainly with the high misorientation angles. The large percentage of the recrystallized grains, whose misorientation angles with deformed grains exceed 15°, are corresponding to the {111} transformation texture. Nucleation first starts at colonies that have the highest stored energy of deformation, which has the same orientation as the deformed grains. By analysis, the formation of recrystallization texture was well explained by oriented nucleation mechanism rather than by selective growth mechanism.


Cao L.,Jinan Iron and Steel Company
Kang T'ieh/Iron and Steel | Year: 2015

A lot of longitudinal cracks were observed on the surface of 250 mm×1820 mm wide heavy slab containing 0.120%-0.150% carbon, produced using the protecting slag for peritectic steel in one Wide Heavy Plate Plant. These surface longitudinal and subsurface cracks have been effectively controlled by improving the basicity of mold powder, decreasing mold powder viscosity and improving the heat transfer between the mold wall and the slab shell. The reason for the slab with 0.090%-0.120% carbon be free of surface cracks is the segregation crystallization, which causes the carbon content in the initial solidified shell is lower than 0.090%. ©, 2015, Chinese Society for Metals. All right reserved.


Li Y.,Jinan Iron and Steel Company
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

In order to control the nitrogen content in liquid steel and improve the inherent quality of the products, based on the production practice during the process of BOF-LF-CC, the influence factors and controlling technology of the nitrogen content in the liquid steel were studied. In order to meet the needs of steel quality for low nitrogen content, the following measures have to be taken, such as an optimal changing-over time of nitrogen and argon holding about 11min, avoiding reblowing time, replacing tap hole duly; avoiding steel being exposed to the atmosphere in LF furnace, and introducing the operation of large amount slag embedding; adopting protected pouring process and so on.


Shan X.-Y.,Yanshan University | Shan X.-Y.,Jinan Iron and Steel Co Ltd | Liu H.-M.,Yanshan University | Jia C.-Y.,Yanshan University | Sun J.-L.,Yanshan University
Journal of Iron and Steel Research International | Year: 2012

Using the effective matrix methods of flatness and profile control synthetically, the flatness and profile integration control scheme for tandem cold mills is built in order to increase flatness and profile control precision of tandem cold mills. Corresponding control strategies are adopted for various control objectives of different stands and the coordination control strategies of various stands are given, which makes the on-line flatness control cooperate with on-line profile control and implements the parallel control of different stands. According to the measured flatness and profile data of some 1550 mm tandem cold mills, the control scheme is verified and the result indicates that the scheme has high flatness and profile control precision with steady and reliable control process. A new way and method is supplied for researching shape control of tandem cold mills. © 2012 Central Iron and Steel Research Institute.


Zhao W.,Shandong University | Zou Y.,Shandong University | Xia D.X.,Jinan Iron and Steel Company | Zou Z.D.,Shandong University
Archives of Metallurgy and Materials | Year: 2015

The potentiodynamic polarization test and slow strain rate tensile tests of X80 pipeline steel were performed in 0.5M Na2CO3-1M NaHCO3 solution to study the electrochemical and stress corrosion cracking properties. The results of potentiodynamic polarization test show that there is an obvious stable passive region, about from 0v to 0.8V (SCE), indicating that anodic protection is feasible. The results of slow strain rate tensile tests show that the stress corrosion cracking sensibility is high and cathodic protection effect is restricted due to the hydrogen permeation. However, the elongation, yielding strength and tensile strength all increase with anodic protection. The higher anodic protection potential in the stable passive region is benefit to improve tensile strength and yielding strength. However, the higher elongation is obtained at 0.5V (SCE) anodic protection potential.


Yang J.,Shandong University | Shi J.,Shandong Jianzhu University | Zhang W.,Shandong University | Liang L.,Jinan Iron and Steel Co. | Zhao P.,Jinan Iron and Steel Co.
Advanced Materials Research | Year: 2012

Based on the analysis of the rolling process in iron and steel enterprises, an optimal load distribution model is established for rolling mills. The objective function is to minimize the total energy consumption. The equipment and process constraints are considered. The particle swarm optimization (PSO) is employed to get the optimal rolling reductions. The simulation of a six-frame strip demonstrates the feasibility of the proposed method in Jinan Iron & Steel Group. The experimental result shows that the proposed method is efficiency in the optimal load distribution problems. © (2012) Trans Tech Publications, Switzerland.


Shao J.,University of Science and Technology Beijing | He A.-R.,University of Science and Technology Beijing | Yang Q.,University of Science and Technology Beijing | Guo H.-W.,Jinan Iron and Steel Company
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

The expression of quantitative relationships between characteristic parameters of work roll wear and roll shifting strategy parameters was derived, the effect of various roll shifting strategy parameters on characteristic parameters of work roll wear was studied theoretically, and the effect of roll shifting on loading gap under different work roll wears was analyzed. On this basis, the principle of selecting roll shifting parameters was established, and a varying shifting stroke strategy of conventional work rolls in hot rolling was proposed. The strategy was applied in many production lines of hot strip mills in China.

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