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Search Results: 1 - 10 of 2322 matches for " Hot rolling "
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High Temperature Oxidation and Hot Corrosion Behaviour of 9Cr 1Mo Ferritic Cold Rolled Steel in Air at 900°C under Cyclic Condition  [PDF]
Amarish K. Shukla, Dinesh Gond, M. Bharadwaj, D. Puri
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.1011081
Abstract: The oxidation behaviour of 10%, 30%, and 50% cold rolled and unprocessed 9Cr 1Mo ferritic steels in air have been studied under isothermal conditions at a temperature of 900°C in a cyclic manner. Oxidation kinetics was established for all samples on which experiment was conducted in air at 900°C under cyclic conditions for 50 cycles by thermogravimetric technique. Each cycle consisted of 1 hour heating at 900°C followed by 20 min of cooling in air. 10% cold rolled sample followed parabolic rate of oxidation while 30% cold rolled sample showed accelerated rate of weight gain. X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray (SEM/EDAX) techniques were used to characterise the oxidized sample and their scales. 10% cold rolled steel was found to be more corrosion resistance than other in air oxidation for 50 cycles.
Designing of Hot Strip Rolling Mill Control System  [PDF]
Yajun Wu
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43040
Abstract: Aimed at the complex demand of hot strip rolling mill in practicing, the configuration of the coiler and the technological process is analyzed. The arithmetic of coiling tension and the control process is introduced. The frame of the tension adjusting system is given. The coiler control system hardware is designed. The system is designed scientifically with steady control and meets demand of the market.
Modeling of Slab Induction Heating in Hot Rolling by FEM  [PDF]
Ruibin Mei, Changsheng Li, Xianghua Liu, Bao Li, Bin Han
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.34041
Abstract: FEM (Finite Element Method) has been widely used to solve temperature in hot rolling. The heat gen-erating rate of electromagnetic field has been discussed in order to improve the efficiency and accuracy in the solution of induction heating. A new heat generating rate model was proposed and derived from the calculated results by FEM software in consideration of work frequency, source current density, and the air gap between induction coil and slab. The calculated distribution of heat generating rate in the skin depth by the model is satisfying and reliable compared with that of FEM software. Then, the mathematic model of the heat generating rate model is considered as the density of heat reservoir to solve the temperature in induction heating. Moreover, the temperature evolution of slab in induction heating from a hot rolling plant has been solved by the developed FE code and the calculated temperature has a good agreement with the measured value. Therefore, the heat generating rate model is suitable and efficiency to solve the temperature in induction heating by FEM.
A New Method of Manufacturing Small-Diameter Bars and Tubes from Hardly Deformable Steels in Skew Rolling
Ga?kin, A. M.,Rz?sowska-Przala, A.,Górniak, A.
Metalurgija , 2007,
Abstract: The paper discusses the process of hot rolling on skew rolling mills and compares it with other methods of manufacturing rods (shape milling) and tubes (pilger rolling). The method and results of calculation of the optimal price of a three-roll skew rolling mill taking into account the benefits for the purchaser and the manufacturer are given.
Prediction of Process Parameters on Stress and Strain Fields in Hot Rolling Process using Finite Element Method
Licheng Yang,Jinchen Ji,Jinxiang Hu,Liwei Ning
Information Technology Journal , 2011,
Abstract: To predict the distribution of stress and strain fields in hot rolling process, the computer models are built using rigid-plastic finite element method and are calculated using up-dated Lagrange method. The workpiece and the work-roll are defined as the deformation body and the rigid body with heat transfer, respectively. All kinds of heat boundary conditions, initial boundary and heat generation are introduced in the model. The analysis is capable of considering the effects of various parameters such as rolling speed, reduction ratio and tension rolling on effective strain, effective stress, contact normal stress and friction stress. In addition, the distributions of stress and strain and strain history are also calculated along contact arc length and thickness direction in the hot rolling process. To assess the reliability of the numerical analysis, a comparison is made between the prediction results and published literature and a reasonable agreement is obtained in this study.
Consideration of Castability and Formability for New Magnesium Alloys  [PDF]
Rongshi Chen, Songmao Liang, Di Wu, Enhou Han
Open Journal of Metal (OJMetal) , 2012, DOI: 10.4236/ojmetal.2012.21002
Abstract: A comprehensive consideration based on castability or plastic formability, as well as mechanical properties for development of either cast magnesium alloys or wrought magnesium alloys is a very important issue. To develop new magnesium alloy sheets with high formability at room temperature, the microstructure, texture, ductility and anisotropy of rolled Mg-Zn-Gd alloy sheets were investigated. The sheets exhibit an excellent ultimate elongation of nearly 50% and an uniform elongation greater than 30% with a very low planar anisotropy. The new sheet has a random basal texture and the basal pole is tilted by maximum 40° from the normal direction towards the transverse direction. The majority of grains in the tilted texture have an orientation favorable for both basal slip and tensile twining because of their high Schmid factor. The low planar anisotropy, the large uniform elongations and the high strain hardening rate observed in the Mg-Zn-Gd sheets result in excellent room temperature formability, the Erichsen values reach ~8, well comparable with the conventional aluminum alloys sheets at room temperature. The solidification pathways and phase equilibria of Mg-Al-Ca alloys have been profoundly investigated by using thermal analysis and thermodynamic calculations. The relationship between hot tearing tendency and alloy compositions were discussed in terms of strength of the mushy zone, solidification pathways and feeding mechanisms, et al. Thixoforming refers to as that metal components are formed in their semi-solid state. Criteria for thixoforming are summarized and then the thixoformability of Mg-Al-Ca based alloys (AC alloys) are evaluated using the thermodynamic calculations based on the consideration of metallurgical parameters.
Modelling the microstructural evolution during hot rolling
Gómez,G.R.; Pérez,T.;
Latin American applied research , 2002,
Abstract: a metallurgical model that describes the microstructural evolution of c-mn steels in the hot strip mill, and that predicts the yield strength and the ultimate tensile strength based on the steel chemistry and the processing conditions is presented. the model comprises the microstructural evolution during hot deformation in the austenitic range (taking into account the effects recrystallization and grain growth), and the austenite decomposition during cooling (formation of ferrite, perlite and/or bainite). a comparison between calculated and measured yield strength and ultimate tensile strength values for several steels and processing conditions is also included.
Modelling and control of a hot rolling mill
Rossomando,F. G.; Denti Filho,J.;
Latin American applied research , 2006,
Abstract: in this paper, a real application of optimal control of a hot rolling mill is presented. it is used the state space model formulation in the minimization of the strip thickness variations. it is presented the simulation results of the control model, which is compared with industrial real data from process controled by traditional techniques. the results of the simulations lead to a less output thickness variations compared with the real industrial data.
Caracteriza??o microestrutural dos alumínios comerciais AA1100, AA1050 e AA1070 e do alumínio superpuro AA1199
Oliveira, Janaina da Costa Pereira Torres de;Padilha, Angelo Fernando;
Rem: Revista Escola de Minas , 2009, DOI: 10.1590/S0370-44672009000300017
Abstract: a comparative study was carried out among three commercial purity aluminums with different levels of purity: aa1100 (99.00%), aa1050 (99.50%) and aa1070 (99.70%), produced on an industrial scale by direct chill (dc) process, and super pure aluminum, aa1199 (99.995%) produced in the laboratory. several techniques of microstructural analysis were used: conventional optical microscopy, scanning electron microscopy, optical microscopy with polarized light, measurements of electrical conductivity and vickers hardness. the three commercial purity aluminums showed an increase in work hardening and a decrease in electrical conductivity as the impurity content increased.
Modelling and control of a hot rolling mill
F. G. Rossomando,J. Denti Filho
Latin American applied research , 2006,
Abstract: In this paper, a real application of optimal control of a hot rolling mill is presented. It is used the state space model formulation in the minimization of the strip thickness variations. It is presented the simulation results of the control model, which is compared with industrial real data from process controled by traditional techniques. The results of the simulations lead to a less output thickness variations compared with the real industrial data.
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