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Analysis of Rolling Pressure in Asymmetrical Rolling Process by Slab Method

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Journal of Iron and Steel Research International 2009年第4期16卷 22-26,38页

作者： TIAN Yong GUO Yan-hui wang zhao-dong wang Guo-dong State Key Laboratory of Rolling and Automation Laboratory Northeastern University Shenyang 110004 Liaoning China

The plane strain asymmetrical rolling was analyzed using slab method. The contact arc was replaced by parabola, and the constant surface friction status was adopted during the analysis. The deformation area was divided into three zones according to the direction of the friction. Then, the three zones were studied, respectively. A rolling force model and a rolling torque model were developed based on the analysis, and they were used to analyze the influ- ence of asymmetrical rolling factors on deformation area and unit pressure if they had good precision which was determined by comparing the calculated results with the measured ones.

关键词： asymmetrical rolling slab method asymmetrical factor specific pressure distribution

Optimization of Holding Temperature and Holding Thickness for Controlled Rolling on Plate Mill

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Journal of Iron and Steel Research International 2006年第3期13卷 21-25页

作者： HU Xian-lei zhao Zhong wang Jun wang zhao-dong LIU Xiang-hua wang Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Holding temperature and holding thickness are main parameters for two-phase controlled rolling on plate mill. The optimization of holding temperature and holding thickness for pass schedule calculation of two-phase controlled rolling on plate mill was presented and its feature is as follows：（1） Determination of holding thickness can be automatically obtained based on the influence of mill safety limits, tracking zone length and holding time on holding thickness; （2） Determination of holding temperature can be automatically obtained and the holding time can be reduced as much as possible; （3） Algorithm can modify the holding temperature and thickness depending on slab size and product size.

关键词： plate two-phase controlled rolling pass schedule holding temperature holding thickness

Effects of Tempering Temperature and Mo/Ni on Microstructures and Properties of Lath Martensitic Wear-Resistant Steels

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Journal of Iron and Steel Research International 2013年第4期20卷 70-75页

作者： CAO Yi wang zhao-dong KANG Jian WU Di wang Guo-dong State Key Laboratory of Rolling and Automation Northeastern University

The tempering behavior was experimentally studied in lath martensitic wear-resistant steels with various Mo/Ni contents after tempering at different temperatures from 200to 600℃.It is shown that a good combination of hardness（HV）（420-450）and-20℃impact toughness（38-70J）can be obtained after quenching and tempering at 200-250 ℃.The microstructure at this temperature is lath structure with rod-like and/or flake-likeε-carbide with about 10nm in width and 100nm in length in the matrix,and the fracture mechanism is quasi-cleavage fracture combining with ductile *** at temperature from 300to 400℃results in the primary quasi-cleavagefracture due to the carbide transformation from resolved retained austenite and impurity segregation between laths or ***,when the tempering temperature is higher than 500℃,the hardness（HV）is lower than 330 and the fracture mechanism changes to ductile fracture due to the spheroidization and coarsening of *** of Mo and Ni have no significant effects on the carbides morphologies at low tempering temperatures,but improve the resistance to softening and embrittling for steels when tempered at above 350℃.

关键词： tempering temperature property lath martensite carbide Mo Ni

Construction and Application of Quenching Critical Cooling Rate Model

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Journal of Iron and Steel Research International 2010年第3期17卷 40-45页

作者： FU Tian-liang wang Ri-qing wang zhao-dong wang Guo-dong wang Ming-tao The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Productive Sector Northern Heavy Industries Group Co Ltd Shenyang 110025 Liaoning China Heat Treatment Workshop Linfen Medium Plate Plant Taiyuan Iron and Steel Group Linfen 041000 Shanxi China

Based on exploring quenching mechanism, three types of quenching critical cooling rate models of mediumcarbon steel and low-carbon steel and low-alloy construction steel were established, as modified Maynier model, Eldis model and isothermal curve model, respectively. During construction process, regression analysis and Newton interpolation method were used for higher calculated precision. Through comparing and analyzing, the superior one was selected to evaluate the full hardening thickness after quenching. According to hardness analyzing, the deviation between predicted hardness distribution and the experimental value is within 6%.

关键词： medium-carbon steel and low-carbon steel low-alloy construction steel critical cooling rate hardenability

Influence of Roll Elastic Deformation on Gaugemeter Equation for Plate Rolling

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Journal of Iron and Steel Research International 2004年第2期11卷 25-29页

作者： HU Xian-lei wang Jun wang zhao-dong LIU Xiang-hua wang Guo-dong Northeastern University

The error of gaugemeter equation decreases the gap setting *** precision of gaugemeter equation is strongly influenced by plate width,work roll radius,backup roll radius,work roll crown,backup roll crown and rolling *** these influences are hard to *** these factors are converted to roll deflection deformation and roll flattening deformation for *** order to calculate the deformation,the theory of influence function method was *** using simulation program,the influence of these factors on deformation was *** a simple model can be *** this model,it is convenient to analyze the influence of different factors on gaugemeter equation.

关键词： rolling plate elastic deformation influence function method roll flattening

Application of Shape Lock-on Method in Plate Rolling

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Journal of Iron and Steel Research International 2004年第3期11卷 24-26页

作者： HU Xian-lei wang Jun wang zhao-dong LIU Xiang-hua wang Guo-dong Northeastern University

AGC system can improve the plate gauge precision,and damage the plate shape if the shape control loop is left quite *** damage will cause wave during rolling wide-thin plate.A control strategy named shape lock-on method is afforded for plate shape *** method requires APC instead of AGC at last one or two passes during rolling wide-thin *** by theory and on-line application,this method is good for the plate shape and crown control with small effect on gauge control.

关键词： rolling shape plate AGC crown

Development of New Generation Cooling Control System After Rolling in Hot Rolled Strip Based on UFC

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Journal of Iron and Steel Research International 2013年第7期20卷 29-34页

作者： LI Hai-jun LI Zhen-lei YUAN Guo wang zhao-dong wang Guo-dong State Key Laboratory of Rolling and Automation Northeastern University

Ultra-fast cooling （UFC） is an advanced technology in hot rolling field. Through this technology, great changes on the run-out table are produced in the strip cooling process. In order to adapt to these changes, a new gen-eration of hot strip cooling control system after rolling was developed based on the UFC basic principle. The system can not only accomplish temperature of UFC delivery side, coiling temperature, cooling rate, etc, and multi-objective accuracy control, but also offer more flexibility and new attractive possibilities in terms of cooling pattern on the run-out table, which could be of prime importance for the production of some difficult steels. In addition, through the time-velocity-distance （TVD） profile prediction combined with speed feed-forward control and coiling temperature feedback control, the coiling temperature control precision can be effectively improved during accelerative rolling in the system. At present, the system has been successfully used in the conventional strip production line and CSP short process production line, and its application effect is perfect.

关键词： ultra-fast cooling hot rolled strip laminar cooling new generation cooling control system run-out rollertable strip cooling

Texture Evolution in Ferritic Rolled Ti-IF Steel During Cold Rolling

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Journal of Iron and Steel Research International 2010年第1期17卷 44-48,58页

作者： ZHANG Peng GUO Yan-hui wang zhao-dong wang Guo-dong LIU Xiang-hua State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China Benxi Iron and Steel (Group) Co Ltd Benxi 117000 Liaoning China

The texture evolution of ferritic hot rolled Ti-IF steel during cold rolling was investigated in which the reduction was from 15% to 85 %. It was found that α fibre texture was monotonously intensified with the increase in the cold rolling reduction, while y fibre texture changed in a different way. When the cold rolling reduction was in the range of 15 % -- 35 % or 45 % -- 75 %, γ fibre texture was strengthened ; however, when the cold rolling reduction was 35 %- 45 % or 75 %- 85%, the intensity of 7 fibre was reduced. The 7 fibre displayed a maximum intensity for the reduction of 75%, and the highest average plastic strain ratio was simultaneously obtained owing to the favorable recrystallization texture.

关键词： Ti-IF steel ferritic hot rolling cold rolling texture average plastic strain ratio

Application of Crown-Flatness Vector Analysis in Plate Rolling Schedule

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Journal of Iron and Steel Research International 2004年第5期11卷 22-26页

作者： HU Xian-lei wang zhao-dong JIAO Zhi-jie zhao Zhong LIU Xiang-hua wang Guo-dong Northeastern University

A simple plate crown model was introduced,and the crown-flatness vector analysis method was *** on the plate rolling technology,the rolling schedule design of elongation phase is divided into three *** step is to calculate the reductions of first pass of elongation making full use of the mill capability to decrease the total pass *** second step is to calculate the pass reduction for the last three or four passes to control crown and flatness by crown-flatness vector analysis *** the third step,the maximum rolling force limit and the total pass number are adjusted to make the plate gauge at exit equal to target gauge with satisfactory *** on-line application shows that this method is effective.

关键词： crown flatness,plate rolling schedule steepness