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2008 Vol. 43 No. 3
Published: 2008-03-15
综合论述
1
YIN Ruiyu
Achievement on the Thin Slab Casting Process in China
The worldwide status of thin slab casting process has reviewed briefly, and the development course of thin slab casting in China is discussed in detail. Nowadays, China is the number one of production of thin slab casting process in the world. Meanwhile, the great progress on production technologies, equipment development and integration of process system has been achieved. The index of production technique is improved gradually , the variety of steel product and proportion of high value added product of thin slab casting line are increased year by year. And finally, the problems and research direction of thin slab casting process in China are put forward.
2008 Vol. 43 (3): 1-0 [
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原料与炼铁
10
JIN Mingfang;LI Guangsen;CHU Mansheng;SHEN Fengman
Diffusion Between MgO and Hematite During Sintering
In sinters, MgO mainly distributes in ferric phase and reacts with hematite and wustite generating magnesioferrite and MgObearing wustite. In addition, only a small amount of Mg2+ is soluted in silicate binding phase.The diffusion couple consisted of dolomite and hematite fines was used to study diffusion behavior betweem MgO , CaO of dolomite and hematite and the diffusion rate of MgO into hematite by means of optical microscopy observation and EPMA test. The results show that the low melting point substances like CaO·Fe2O3 and CaO·2Fe2O3 promote the diffusion reaction between dolomite and Fe2O3 and the amount of diffused CaO is more than that of MgO. The diffusion rate of MgO into hematite is 17.2 μm/min.
2008 Vol. 43 (3): 10-0 [
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15
FAN Xiaohui;GAN Min;YUAN Lishun;LI Guanghui;JIANG Tao;ZHUANG Jianming
Study of Mechanism on Ring Formation in GrateKiln of Acid Pellet
The ring formation in rotary kiln is a complicated process,which obstructs the development of gratekiln production.In the experiment of ring formation in the acid pellet gas heated rotary kiln, the kiln was divided into three parts,the head of kiln,the middle of kiln and the tail of kiln to study the mechanism and the influencing factors of ring formation.The reasons and the main influencing factors of ring formation in every parts are discussed,and the measures of eliminating ring formation are put forward.
2008 Vol. 43 (3): 15-0 [
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21
LIU Zhengjian;ZUO Haibin;ZHANG Handou;ZHANG Jianliang;YANG Tianjun
Research and Application of Collection Algorithm for Characteristic Section Image of Sintering Machine PlantTail
Ｔhe definition of characteristic section image of sintering machine planttail is thoroughly described and deeply analyzed for the first time, two types of characteristic section image and pallet critical value are proposed, and the calculation method of pallet critical value is demonstrated. For 360 m2 sintering machine at Donganshan sintering plant, the disadvantages of existing collection algorithm were eliminated by using, a new algorithm,which is simple, efficient, adaptable and easy to use.By resonable presetting up and down borderlines of the judging area and three simple judging thresholds,the new algorithm can exactly collect characteristic section image for every operation mode,and by presetting minimum average temperature the new algorithm can efficiently eliminate the misjudgment for glow image. Since the system was put into production in Jan, 2007, the rate of exact collecting characteristic section image has been over 95%.
2008 Vol. 43 (3): 21-0 [
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25
L Qing;ＺＨＡＯ Ｌishu;ZHANG Shuhui;HUANG Jianming;LI Fumin
Effect of Temperature and Gas Pressure on Sulphur Capacity of CaOSiO2Al2O3MgOFetO system
The sulphur capacity of CaOSiO2Al2O3MgOFetO slags with fixed slag composition,at different temperature and under different gas pressure was measured using gasslag equilibrium techniques.In Pt crucible, the slag was equilibrated with a mixture of CO, CO2, SO2 and N2 at required partial pressures of oxygen and sulphur. It was shown that , the sulphur capacity of slag decreases with the increase of temperature under constant gas pressure; at a constant temperature the rising of oxygen pressure results in an increase in sulphur capacity.
2008 Vol. 43 (3): 25-0 [
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炼钢
29
YANG Jun;WANG Lijiang;SHENG Jianhua
Study of Slab Casting Technology for AISI409L Ferritic Stainless Steel
The SEN clogging,slab width variation, developed columnar crystals, and slab fracture of 409L steel are caused by special physical properties and stabilization element addition.The study of solidification, elevated temperature physical properties and precipitation of 409L was carried out. The preliminary solution was got to solve these technical problems, and the product quality was enhanced.
2008 Vol. 43 (3): 29-0 [
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33
CHEN Yong;LUO Xin;SHEN Houfa
Thermomechanical Model of Heat Transfer in Bloom Casting Mold
The longitudinal corner surface cracks were occurred at the initial stage of operation of continuous bloom caster at Pangang. Therefore, a thermomechanical model was developed to analyze the heat transfer and the stress distribution of strand in the mold. The heat transfer was analyzed with the steady model and the transient model, respectively. The contact of the mold and strand was taken into account in the mechanical model to treat the air gap formation at the mold corner, and the strain as well as stress of strand were analyzed with thermal elastoplastic model. The calculated results of the temperature of and stress distribution in the strand cast with two different molds show that the corner configuration has a great effect on heat transfer near the corners.When the corner configuration is optimized from 25 mm×45° to 12 mm×45°, the strand temperature becomes lower and the solidified shell thickness becomes thicker, which will reduce the cracking tendency near the corners.
2008 Vol. 43 (3): 33-0 [
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38
HU Mingqian;HU Mingshan
Study on High Temperature Ductility of Continuously Cast Slab
The high temperature ductility of different continuously cast carbon steel slab was studied. With Gleeble2000 hot simulater to control surface cracking and improve product quality.
2008 Vol. 43 (3): 38-0 [
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41
WANG Feng;TIAN Naiyuan;HE Dongfeng;XU Anjun
Discussion on Full Ladle Preparation for Sequential Casting
The preparation of spare full ladles at some steel works was analyzed for five reasons and the formula calculating the time of every procedure without spare full ladles are proposed.Six measures which could decrease the number of spare full ladles before start of casting are put forward. Finally, the formulas of rational number of spare full ladles and maximal heat number of sequential casting are given.
2008 Vol. 43 (3): 41-0 [
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44
MA Changwen;CHEN Songlin;ZHENG Tianran;YANG Xiaoshan
Study on Roll Gap of Slab Caster Based on Solidification Shrinkage
In order to research the effect of roll gap reduction on reducing the centerline segregation of slab, the temperature and solidification shrinkage of a slab were calculated by numerical simulation, the distribution of the solidified shell thickness and solidification shrinkage along the metallurgical length were analyzed, then three sets of roll gap reduction were built,tested and their effects were compared. The results show that the roll gap reduction within 23 segments before the solidification end is effective to reduce the centerline segregation, and the roll gap reduction rate should be a little more than the slab solidification shrinkage.
2008 Vol. 43 (3): 44-0 [
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压力加工
49
WANG Guodong;LIU Xianghua;SUN Ligang;LIU Zhe;LIU Deqin
Ultra Fast Cooling on Baotou CSP Line and Development of 590 MPa Grade CMn LowCost HotRolled Dual Phase Steel
The parameters and operation of the ultra fast cooling system in Baotou CSP line are introduced. 590 MPa grade lowcost CMn dual phase steel strips of 411 mm in thickness were developed by using laminar and ultra fast cooling process.The main mechanical properties are:tensile strength 590620 MPa,yield ratio 0.620.67, elongation 26%36% and the n value of 0.21. The effects of ultra fast cooling on the structure of dual phase steel strip are analyzed.
2008 Vol. 43 (3): 49-0 [
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53
YU Hui;ZANG Xinliang;DU Fengshan;WANG Feixue;PAN Feng;ZHOU Xiaolan
Simulation Analysis on Formation of Bore Hexagonal Shape of Seamless Tube in Stretch Reducing Rolling Process
Based on the deformation characteristics of seamless tube during stretch reduction,a 3D thermomechanical coupled finite element model was established to simulate the deformation process of tube on 18stand stretch reducing mill. The comparison of finite element analysis results with measured ones indicated that the simulation model is practical and reliable. It was found that the transverse wall thickness distribution is nonuniform and that is the cause of hexagonal bore formation. The model can be used to analyse product flaws and instruct technological design.
2008 Vol. 43 (3): 53-0 [
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57
FENG Xianzhang;WANG Yi;LIU Aimin;LIU Cai;ＪIANG Guangbiao
Research of Distribution of Friction Force and Displacement Field in Hot Strip During Coiling
In order to analyze the distribution of internal frictional force and determine the least layer number for expansion of coiler, the coiling process was studied with FEM. For strips from 5 mm to 20 mm in thickness，and the layer number from 2 to 5, the internal metal flow in strip and nodes at innermost layer nodes during coiling was studied with relative displacement of strip head as a criterion,and the conditions of no loose winding during coiling were determined. The results indicated that the distribution of frictional force is changed from layer to layer,and 5 layers of strip are enough for stable coiling. The study is useful for improving the metal yield and reducing the wear of auxiliary roller.
2008 Vol. 43 (3): 57-0 [
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61
LI Hongbo;ZHANG Jie;CAO Jianguo;WANG Qiang;ZHANG Shushan
Study on the Backup Roll Contour for CSP Continuous Hot Rolling Mill
Several domestic continuous hot rolling mills in CSP (compact strip production) have CVC (continuously varible crown) work rolls and conventional backup rolls. As the CSP production process is different from the conventional hot rolling with less product varieties,widths, and different roll service periods of stands, the wear characteristics of the rolls are different too. Through tracing and testing the backup rolls, it was found that the backup rolls of the 1800 mm CSP continuous hot rolling mill have two typical wear characteristics on different stands, the serious wear of backup rolls affects the controllability of the mill for profile and flatness of products, and increases the roll consumption.Based on theoretical analysis, two new backup roll contours were proposed for two wear characteristics. Both the trial and the FEM analysis proved that the new roll contours have good property of selfmaintenance, and can work well during the whole service period.
2008 Vol. 43 (3): 61-0 [
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钢铁材料
65
YAO Xusheng;LIU Yandong;ZUO Liang
Quantitative Texture Analysis of Cold Drawn Pearlitic Steel Wires
Texture of cold drawn pearlitic steel wire was investigated by a method combining modified texture measurement method with orientation distribution function (ODF). The wire was austenited at 1223 K for 0.5 h, then isothermally treated at 296, 773 and 923 K for 0.5 h before cold drawing.The results showed that the <110> fibre texture is mainly gathered on the αfibre in cold drawn wire.The main texture components are {001}<110>, {111}<110> and {110}<110>，and the component {001}<110> is the strongest. Results of quantitative calculation showed that <110> component tends to increase from surface to center at 296 K; The <110>component first increases then decreases from surface to center at 773 and 923 K and has the highest value in the center at 923 K.
2008 Vol. 43 (3): 65-0 [
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68
GENG Hongming;WU Xiaochun;MIN Yongan;WANG Hongbin;ZHANG Hongkui
Effects of Copper and Sulphur on Mechanical Properties of Stainless Steel 4Cr13
The effect of copper and sulphur on mechanical properties of stainless steel 4Cr13 were studied by high temperature tensile test, impact test and polish test. Results showed that high temperature resistance of deformation of 4Cr13 is not changed by adding copper and sulphur. The percentage reduction in area of 4Cr13 is decreased by adding copper and sulphur. The impact toughness of 4Cr13 is decreased by adding sulphur, while increased by adding copper. The roughness of polished surface of 4Cr13 is increased by adding copper and sulphur.
2008 Vol. 43 (3): 68-0 [
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72
DONG Yun;ZHANG Jianjun;LIU Shening;LIN Xiaoping;LIU Wenkai
Investigation on Structure and Properties of CSiMnCrVNb Grain Refined Steel
For（0.15%0.35%）low alloyed CSiMnCrVNb steels austenite grains of 1112 grade can be obtained by controlling the forging ratio.The abrasive property of such steel was studied.The results show,for low carbon grade, the micro cutting gradually changes into serious adhesion abrasion with the increase of load and abrasion velocity of dry friction. For the steel grade with higher carbon content, whose major wearing form is micro cutting, the pan furrows are wider and deeper with minimal adhesion abrasion and spalling fatigue. Under the condition of dynamic load, the major wear form is grinding abrasion. The alloy of 035% carbon content, which can not only resist the cutting of quartz particles, but also can reduce the spalling, has better structure, performance and perfect abradability.
2008 Vol. 43 (3): 72-0 [
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77
KUANG Shuang;KANG Yonglin;YU Hao;LIU Rendong;YAN Ling
Influence of Tempering on Microstructure and Mechanical Property of Dual Phase Steel of CSiMn Alloy System
The influence of tempering temperature on the microstructure and mechanical properties of a dual phase steel was studied. The results of mechanical test show that elongation is improved by tempering below 250 ℃, but the change of other mechanical properties is not obvious. After tempering above 300 ℃, elongation does not increase much, but the yield strength is increased with decrease of tensile strength, workhardening and bakehardening capacity deteriorating the mechanical properties of the steel. The results of SEM and TEM analysis indicate that the variation of microstructure is not changed obviously after tempering below 250 ℃,the morphology of martensite is lathshaped and a large number of unobstructed dislocations is observed in ferrite and around martensite islands. By tempering above 300 ℃, martensite decomposes obviously, making the boundaries illegible, and precipitation of carbide particles in the islands. In ferrite the density of dislocation decreases, and there are many coarse precipitates on dislocation lines. The decomposition of martensite and decrease of dislocation density in ferrite are the main reasons of deteriorating the mechanical properties of dual phase steel.
2008 Vol. 43 (3): 77-0 [
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81
CHEN Jiayan;LIU Jiang;YANG Zhuoyue;ZHANG Yongquan
Research on Precipitates and Relationship With Martensite of Maraging Stainless Steel
The aging precipitates and the relationships with martensite of Custom 465 were researched. The results show that Ni3Ti is the major precipitate in the steel. The precipitates take the form of poles with the longitudinal axis parallel to ［111］M. The relationships between the precipitates and the martensite are (011)M//(0001)Ni3Ti ［111］M//［1120］Ni3Ti. These relationships make Ni3Ti precipitate in 12 kinds of possible variants.
2008 Vol. 43 (3): 81-0 [
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环保与能源
86
LI Qiurong;BAI Minghua;HE Jun;WU Jinbao
Thermodynamic Analysis and Test Study of Nitric Oxide Removal by Low Carbon Hydrocarbons
The thermodynamic functions of NO removal by low carbon hydrocarbons such as methane, ethane, ethene, ethine, propane and propene are calculated，and enthalpy changes of reaction producing activated particles from low carbon hydrocarbons in electric field are calculated to find out the appropriate low carbon hydrocarbons for removing NO. On the basis of calculated results, the experiment was carried out to remove NO by propane and propene with pulse corona discharge and amonia.The optimal process parameters are，inlet wind velocity is 1.2 m/s, outlet wind velocity is 1.0 m/s; inlet temperature is 80 ℃，outlet temperature is 40 ℃,pulse voltage is 50 kV, removal efficiency of NO is 60% with propene, and approach 30% with propane, respectively.
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装备与控制
90
L.Morsut
Winning Concepts in Steel Plant Automation and Process Control
An overview of the stateoftheart solutions available today for optimized steelmaking,enabling new levels of productivity and quality,introducing the visions for the years to come.
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