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2006 Vol. 41 No. 5
Published: 2006-05-15
压力加工
0
WANG Renzhong;HE Anrui;YANG Quan;ZHAO Lin;DONG Haoran
Profile Control Capability of LVC Work Roll Contour
Hot!
A new work roll contour is advanced which is a linear variable crown (LVC) roll. This roll contour can realize linear ratio of gap crown and strip width. Gap adjustment area and gap transversal stiffness as two basic control capabilities for strip profile are used to evaluate the strip shape control ability of LVC work roll. Then LVC work roll was applied to real production. The results show that LVC work roll contour has good availability according to calculation and comparison.There is definite innovation on the research of work roll contour.
2006 Vol. 41 (5): 0-0 [
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QU En;ZHOU Yulin
Design of Rebar Straightening and Cutting Machine With Rotating Hub and Steel Balls
Hot!
To reduce the rebar straightening power on conventional straightening machine, a new mould straightening principle with rotatinghub is proposed. According to this principle, three steel balls which rotate in any direction are mounted in a mould to transform sliding friction between rebar and balls into rolling friction. In this way, the force pushing rolls and straightening power are decreased greatly, and quality of straightened rebar can be obviously improved. The tolerance in straightness can be less than 1 mm per meter. The force and performance of this straightening machine are analyzed and calculated for designing.
2006 Vol. 41 (5): 0-0 [
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CHEN Peilin;WANG Zeji
Cause and Control of Chatter Marks on Steel Strip Surface
Based on the physical characteristics of chatter marks, the interaction between marks and vibration of rolling mill is described. The effect of rollers, work roller bearings, spindle coupling clamp and roll grinding machines on chatter marks was studied with vibration measurement and mode analysis for both mill and roll grinding machine. The results show that chatter marks are a visual phenomenon caused by waves on strip surface, moreover, there are two causes of chatter marks formation, one is that the rolling mill (leveler) is vibrated at some frequency, the other is that there are marks on the surface of rollers. It is possible to control the marks by some measures such as matching of roller diameter, regular monitoring of multiple peak value of ball bearing vibration, use of damp absorber on grinding machine, speed change of rolling and grinding, and more careful maintenance of equipment.
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TANG Guangbo;LIU Zhengdong;KANG Yonglin;WANG Wei;ZHANG Pijun
Simulation of Thermal Evolution of Strip and Determination of Heat Transfer Coefficient in Deformation Zone During Hot Rolling
Hot!
The numerical simulation method was used to study the heat transfer and temperature distribution of rolling piece during hot strip rolling. According to the temperature measured in production, a statistical model of interface heat transfer coefficient (HTC) for prediction of thermal evolution of rolling piece in roll gap was developed; and some features of the thermal evolution and temperature distribution on the cross section of rolling piece in roll gap are analyzed. The results show that there is a good agreement between the values predicted by the model and measured ones; the interface HTC between rolling piece and work roll is dependent on the mean rolling pressure as well as the rolling speed; and there is a significant temperature gradient on the cross section of rolling piece in roll gap.
2006 Vol. 41 (5): 0-0 [
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YANG Lipo;ZHOU Tao;PENG Yan;LIU Hongmin
Experimental Investigation on Elimination of Roll Defects for HC Reversing Cold Mills
Hot!
For the rolls of the 1200 HC(high crown) 6high reversing cold mill, the measures of precaution and elimination of roll failures were put forward from some aspects such as roll inspection, roll grinding and assembly etc. Firstly, advanced inspection methods such as magnaflux method, portable roll surface rigidity detector, macrostructure analysis and so on should be applied to find out the roll defects, which are difficult to be observed with naked eyes. Secondly, some measures, such as modifying cooling and lubrication systems and filtrating equipment, designing reasonable grinding amount and roll changing period, and machining the compound chamfer angles at two shoulders of the intermediate rolls and backup rolls etc., can reduce roll consumption, and increase roll campaign. After modification, the roll changing period was increased from 100 km to 160 km, the roll defects and consumption (including the intermediate rolls and backup rolls) were greatly decreased, and the hour output of mill was improved by 11.1%.
2006 Vol. 41 (5): 0-0 [
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LI Guiyang;MA Liming;ZHANG Zhiqiang;FENG Jianhang;LI Jiazheng
Production Practice of 20MnSiNb HRB400 Rebar
Hot!
Based on strengthening mechanism of microalloy element Nb and productive technology of bar steel, effect of the composition and rolling parameters on the mechanical properties was investigated. The optimal parameters are:w(Ceq)≥0.39%, w(Nb)=0.02%0.04% and watercooling after rolling for slit rolled rebars. For onestrand rolling process, watercooling is not necessary. According to regression analysis, for slit rolled rebars, the yield strength and tensile strength of rebar can reach 17 MPa and 15 MPa respectively by an increase of Nb content by 0.01%. The tensile strength of 585655 MPa and the yield strength of 405505 MPa are reached for massproduced 20MnSiNb by controlling the composition and rolling schedule.
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LIU Xianghua;ZHAO Xiaolin;YU Hailiang
Relative Motion of Wave on Strip——Analysis to Flying Wave
Hot!
Based on the analysis of relative motion between wave and strip during hot strip rolling, the conception and definition of flying wave，staying wave and fixed wave are given. The study results show that the flying wave appears at the exit of the final stand, and is sustained and strengthened by the periodic impact of roller table. The condition of staying wave formation is the pitch of transfer rollers being the multiple times of wavelength. The occurrence of the flying wave can lead to the error in shape control by shape meter using laser triangle method, but the error can be decreased or eliminated by laser capture method.
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钢铁材料
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LI Wenying;CHEN Weiqing;YUAN Hui;LI Yongdong
Investigation on Strain Aging of Boron Containing Low Carbon Steel Wire Rod
Hot!
The strain aging of boron containing lowcarbon steel wire rods was studied. The results show that adding appropriate boron in lowcarbon steel could slightly reduce the increment of yield strength, which is caused by static strain aging. The increase of tensile strength caused by dynamic strain aging was hardly reduced while ［B］s content was below 0.0029% and ［B］s/［N］<0.4. The increase of tensile strength caused by dynamic strain aging could be decreased obviously when ［B］s is in range of 0.005% to 0.010% and ［B］s/［N］ ≥1.0，so that the drawing performance of lowcarbon steel wire rods could be improved.
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HANG Shenghan;FAN Yongzhe;CHEN Yingmin;LI Xiangyang
Genetic Programming Approach to Predicting Temper Embrittlement of Rotor Steels Using Electrochemistry Technique
Hot!
The genetic programming approach was proposed to predict temper embrittlement of rotor steel (30Cr2MoV). Two independent data sets were obtained experimentally: training data and verifying data. Peak current density of reactivation measured by the potentiodynamic anode polarization method, temperature of electrolyte, the chemical composition of steel (Jfactor), Cr content and the grain size of steel were used as independent variables, while fracture appearance transition temperature as dependent variable. On the basis of training data, the optimum model was obtained by genetic programming, and the accuracy of it was verified with the verifying data. The prediction error of the model is within ±20 ℃. The accuracy of this model is better than that of the model obtained using multiple linear regression method. The results suggest that, the model obtained by genetic programming is feasible and effective.
2006 Vol. 41 (5): 0-0 [
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SU Shihuai;HE Yizhu;ZHU Tao;LIU Xuewei;WENG Yuqing
Strengthening Mechanism of HotRolled Low Carbon Steel Produced by CSP
The effect of microstructure, precipitation of second phase on strength of SPHC produced by CSP (compact strip production) were investigated. The yield strength of SPHC produced both by CSP and by traditional technology were compared. The results show that the calculated yield strength of SPHC produced by CSP is 42 MPa lower than measured, but the measured and calculated yield strength of SPHC produced by traditional technology are the same. The TEM observation shows that there are three kinds of particles which sizes are nanoscale, submicronscale, and microscale in the steel produced by CSP. Precipitating strengthening contributes 40 MPa to the yield strength of SPHC produced by CSP.
2006 Vol. 41 (5): 0-0 [
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WU Guangliang;SUN Yanhui;ZHOU Chunquan;CAI Kaike;LI Zhengbang
Study on High Temperature Mechanical Properties of CSP Q235B Slab
Hot!
The high temperature mechanical properties of CSP slab have been investigated by Gleebe1500 hot simulator. The horizontal and vertical section of samples were observed by optical microscope and SEM at 800 ℃, 900 ℃, 1100 ℃. The morphology of fracture was analyzed by TEM, and segregation at grain boundaries and inclusions have been analyzed by XEDS. The test results showed that there are two temperature areas of brittleness for slab produced by CSP within 600～1320 ℃, the first temperature area of brittleness(Ⅰ) is 1320～1200 ℃, the second temperature area of brittleness(Ⅲ) is 600～1000 ℃, the steel is plastic within 1000～1200 ℃, and Z=8.46％ at 800 ℃. There are two reasons for Ⅲ temperature area of brittleness, the first is the stress concentrated caused by precipitation of deformation induced ferrite, the second is precipitation of nitride(AlN) at austenitic boundaries, and the essence of cracking of CSP slab is the nitride(AlN) precipitation at austenitic grain boundaries, making stress concentrated and voids formed, grew up and aggregated.
2006 Vol. 41 (5): 0-0 [
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原料与炼铁
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LI Chuanhui;AN Ming;GAO Zhengkai;DAI Jianhua
Research and Practice of Burden Distribution in BF
Hot!
he serial bellless top with two coaxial vertical was adopted on 1750 m3 BF of Ji’nan Iron and Steel Co., Ltd.. In order to ensure the stable operation of blast furnace and establish operational manual, a model of burden distribution was developed and verified in practice. Based on the principle of steadiness and the theory of coke terrace, a reasonable orecoke ratio can be established. Once coke terrace has been determined, ore distribution matrix can be regulated. In this way, the burden distribution matrix was optimized and the operation of BF was improved. The operational indexes have been improved continuously.
2006 Vol. 41 (5): 0-0 [
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LIU Zhulin;CHEN Zilin;TANG Leyun
Experimental Study on Optimization of Sintering Technology
Hot!
In spite of that charge quality for sintering was improved through using low silicon sinter, but the strength, size and metallurgical properties of sinter were deteriorated. It was found that serpentine addition makes liquid phase and strength increased, return fine and solid fuel consumption reduced and reductionsoftening behavior of sinter improved, in spite of small increase of SiO2 in sinter. Due to high Al2O3 in blast furnace slag, and the influence of MgO in sinter on it’s sinter strength was studied, the industrial experiment showed that replacement of dolomite with lightly fired dolomite partly has small effect on productivity, but the drum strength is increased, solid fuel consumption is reduced, the productivity of BF has increased with lower coke rate and the fluidity of slag is higher. Spraying with 3% CaCl2 reagent is very effective for RDI（reduction degradation index）.
2006 Vol. 41 (5): 0-0 [
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FANG Jue;WANG Xingyan;GUO Li;SHAO Jianhua
Research on High Temperature Compression Strength of Coke
Hot!
The high temperature compression strength of coke was studied using a high temperature compression testing machine with adjustable atmosphere. In the scope of real reactions in blast furnace, the compression strength of coke is in a linear relationship with its carbon loss rate LC. The influence of LC on the strength is reduced with the increase temperature. The relationship between the compression strength and temperature could also be described by straight line. The integrated influence of the temperature and LC on coke strength and change of coke strength in blast furnace are discussed. It was proved that the compression strength of coke can be decreased by over 70% outside the combustion zone in blast furnace.
2006 Vol. 41 (5): 0-0 [
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ZHOU Mingshun;LIU Wanshan;TANG Qinghua;YANG Xipeng;LIU Yuming
Experimental Study on Sintering of Iron Ore Fines With Medium Crystal Water Content
Hot!
By optimal designing of experiments, according to the raw material conditions at Ansteel, the sintering pot tests of iron ore fines blended with imported ore fines containing medium crystal water were done in the lab. The influence of iron ore fines proportion on major technicalandeconomic indexes was investigated. The results show that by adjusting fuel rate, the sintering productivity can be ensured within the proportions of imported iron ore fines 10%30%. With optimization, the optimal proportion of imported iron ore fines is 15%, fuel rate is 5.4%5.5% correspondingly. The proposed proportions of iron ore fines and fuel rate were approved by practice.
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炼钢
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ZHANG Hui;ZHAO Liangang;TAO Hongbiao;LIU Aiqiang;LI Liejun
Numerical Simulation on Fluid Flow and Heat Transfer Behaviors in Mould of CSP Thin Slab Caster
Hot!
For CSP thin slab caster at Zhujiang Steel, a comprehensive mathematical simulation concerning fluid flow, fluctuation of bath surface, heat transfer and solidification of melt was performed with given SEN and measured heat fluxes. It was found that the circulation of liquid steel, in which two uppervortexes occupy most space, is totally localized in the funnelpart of mold. The fluctuation of bath surface is caused by upvortex streams impinging on surface and deviating from the surface, and secondary vortexes exist below meniscus 100 mm off mold narrow faces. Except that there is obvious superheat at lower sides of SEN, the temperature of liquid steel in mold is around the liquidus, and the surface temperature of slab and growth of solidifying shell are affected by streams from SEN, and the hottest zone on slab surface is below meniscus near mold narrow faces.
2006 Vol. 41 (5): 0-0 [
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MU Wenheng;L Zhimin;TANG Di
Application of MAS Mechanism to Scheduling of Steelmaking and Continuous Casting Process
Hot!
Scheduling at BOF shop with some BOFs and casters is a problem. A new scheduling method based on MAS mechanism is introduced. According to the equipment and technological parameters, the simulation model of scheduling of steelmaking and continuous casting process based MAS was built. The structure, scheduling algorithm and scheduling strategy of MAS model were studied. Then the model was tested with real production schedule. The results show that the schedule, location and time of every heat can be determined simultaneously, so the method is effective and applicable.
2006 Vol. 41 (5): 0-0 [
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TAO Liqun;JIANG Maofa;WANG Deyong;XUE Wenhui;JIANG Xuefeng
Physical Modeling and Industrial Practice of Argon Bottom Bubbling in Tundish
Hot!
By means of physical model and industrial practice, the influence of argon bubbling into tundish via porous plug on the fluid flow and inclusion removal was performed. The physical modeling showed that, argon bubbling can remarkably improve the fluid flow characteristics, increase residence time, and enhance mixture degree of liquid steel, and decrease dead volume. The smaller the distance between the porous plug and outlet, the stronger the influence of argon bubbling on the fluid flow characteristics is. Because, the movement track of liquid steel is improved by the argon bubbling and route of fluid flow is much more flexuous and close to the bath surface. The industrial practice showed that, the “gas bubbling curtain” formed by argon bubbling is a potential means to enhance inclusion removal. Compared with the slab cast without Ar bubbling, the inclusion index of the slab cast with argon bubbling was decreased from 7.338.98 mg/（10 kg） to 4.214.33 mg/（10 kg）, especially, the amount of big inclusions was decreased more obviously. In the slab cast with Ar bubbling, no 3050 μm size inclusions was observed.
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装备技术
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E.Ruscio;K.Bergman;S.Olund
Innovative Dynamic SelfAdjusting Danieli Electric Arc Furnace
Hot!
Based on the Danieli DanExpert EAF Suite with several modules,a real time dynamic updating of set points at any change in process status allows for an increased productivity by improving consistency of EAF practices and contributes to lowering transformation costs.
2006 Vol. 41 (5): 0-0 [
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综合论述
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CUI Jian;LIU Xiao
Practice and Recognition of Electric Arc Furnace Steelmaking Technology
Hot!
The difference of the cost and quality of liquid steel produced by EAF and BOF is compared. The application of CoJet at Baosteel and the development of automatic EAF steelmaking are introduced. Finally, several R&D projects at Baosteel of environmental protection concerning EAF steelmaking are introduced.
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环保与能源
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WANG Aihua;CAI Jiuju;LI Xiuping;WANG Ding;ZHOU Qingan
Converter Gas Recovery Analysis and Improvement
Hot!
The basic approaches to improve gas recovery ratio were analyzed in theory based on converter gas recovery system of Baosteel No.2 steel making plant. The effect of following factors such as converter conditions, raw material supply, air suction rate, recovery conditions, and intensity of oxygen blowing on converter gas recovery ratio was studied. And the effects of air suction rate, recovery conditions and intensity of oxygen blowing are remarkable. The physical measures are put forward for modification of hard and soft ware of converter gas recovery system, and good results can be achieved.
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