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2008 Vol. 43 No. 2
Published: 2008-02-15
综合论述
1
XU Kuangdi
Iron and Steel Industry Development and Technological Innovation in China
equipments growing larger in scale; longer life of blast furnaces and converters; coalpowder injection for blast furnace, slag splash technology for converter, and the high ratio of continuous casting for steelmaking process; comprehensive energy consumption and productivity in large and medium steel plants getting close or reaching the world’s advanced level; the output of plates and tubes making up almost 50% of the total products; China is becoming the largest country in the production and consumption of stainless steel.China’s iron and steel industry is constrained by resources and environment. To build up a resourcesaving and environmentfriendly steel industry, China has to form an industrial chain of circulareconomy with steel plants as its core, which carries out three functions of producing high quality steel products, highefficient energy transformation, and utilizing wastes of society.Despite of the rapid expanding in its producing capacity, China’s iron and steel industry has made considerable progress in increasing the strength of steel for construction and fastenings, developing steel for automobiles, and upgrading the performance of pipeline steel, bearing steel, and die steel.
2008 Vol. 43 (2): 1-0 [
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原料与炼铁
14
ZHANG Zhenfeng;L Qing;GAO Feng;LI Fumin;ZHANG Shuhui
Experimental Research on Desulphurization Capacity of High TiO2 and Al2O3 BF Slag
According to the metallurgical condition at Chenggang, the desulphurization capability of slag with high TiO2 and Al2O3 content was studied. The effects of different factors on desulphurization capacity were also studied. The results show that, the favorable slag composition for desulphurization is:basicity (CaO/SiO2) is about 1.16, MgO content is about 13%, Al2O3 content is from 12% to 13%, TiO2 content should be as low as possible.
2008 Vol. 43 (2): 14-0 [
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18
DUAN Feng;ZHOU Li;WANG Jianjun;SONG Canyang;JIN Jun
Study of Shape of Cooling Water Pipe in Stave
The aim of this study was to explore the reasonable shape and arrangement of cooling water pipes in stave. Using numerical simulation method,The influence of cooling water pipe crosssection and their arrangenont on cooling effect of stave was analysed.The resistance of different cooling water pipes was studied with hydraulic experiment. The results showed that the round internally connected pipe is the best for cast steel stave; elliptical is suitable for copper stave, the cooling capacity of stave can be increased and cooling water saved when the ellipticity is 08. The results of this study are likely to provide technical assistance to optimize blast furnace stave.
2008 Vol. 43 (2): 18-0 [
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22
ZHU Qingtian;CHENG Shusen
Preliminary Study on Effects of Charging System of Blast Furnace on Gas Flow Distribution
Gas flow distribution affects directly the campaign and efficiency of blast furnace (BF).Ｔhe proper and optimum distribution of gas flow should be provided. However, the closeness and complexity bring great difficulty on measuring the gas flow. In practice, gas flow distribution in stack is estimated by measuring top gas distribution. Recently, numerical simulation is a new and effective method for research on gas flow,The flow field and temperature field of gas were calculated with numerical simulation. According to the velocity field of gas in different parts of BF, it was found that burden distribution is a determinant factor of rational gas flow distribution in the mid and upper stack and formation of cohesive zone. In addition,the gas flow distribution in lower stack can be controlled by blasting mode.The importance of burden distribution is discussed with practice of BF. The conclusion is:a good charging system is the keystone of BF operation, the effect of burden permeability on radial distribution of gas flow is great while the effect of initial gas flow distribution is small, and the gas flow distribution in lower stack is hard to be reflected by top gas flow.
2008 Vol. 43 (2): 22-0 [
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26
GUO Peimin;ZHANG Linfeng;ZHAO Pei
Study on Catalytic Mechanism of Boudouard Reaction
Influence of salts of alkaline metals,composite oxides and holoids on boudouard reaction was studied by XRD analysis and thermogravimetry experiment. For salts of alkaline metals with same anion, the power sequence of the catalytic effect is K+>Na+>Li+; for the composite oxides with same cation, the power sequence is NO3->OH->CO32->SO42->SiO32->PO43-; for the haloid with same cation, the power sequence is F->Cl->I->Br-.A new catalytic mechanism is proposed: the catalytic effect of a catalyst is attributed to the change of CC chemical bond by catalyst. The effect of catalysts depends on the kinds of cations and anions and stability of compounds .
2008 Vol. 43 (2): 26-0 [
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炼钢
31
WANG Shuhuan;WU Yanqing;LＩＵ Xinsheng;XU Zhirong;L Xiaofang
Experimental Study on Gasification Dephosphorization of Converter Slag With Reduction by Silicon
From 1773 K to 1973 K, the reduction experiments of converter slag simulated for slag splashing by silicon were carried out in a vacuum graphite tube resistance furnace. The result indicates that among the four influencing factors of reducing dephosphorization, temperature is uppermost influencing factors, the content of FeO takes the second place, nitrogen takes the third place, and basicity takes the fourth place. The optimum conditions for gasification dephophorization during slag splashing were determined,the gasification dephophorization rate by reduced slag can reach to 81.23％.
2008 Vol. 43 (2): 31-0 [
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35
GENG Dianqiao;LEI Hong;HE Jicheng
Fluid Flow in RH Reactor Under Different Parameters of Immersion Tubes
The homogeneous model was used to study the fluid flow in RH reactor with different parameters of immersion tubes. While the immersion tubes are located eccentrically, larger eddies appear near the down immersion tube at the bottom of vacuum chamber, under free surface of vacuum chamber and in ladle, but no obvious effect on the recirculation flow rate was observed. While the distance between two tubes is decreased, the recirculation flow rate decreases, and the recirculation near the left wall of the vacuum chamber is enhanced. The recirculation flow rate increases with the immersion depth. In order to increase the recirculation flow rate, either the immersion depth of immersion tubes should be reduced or the distance between immersion tubes,should be increased and if slag entrapment should be avoided at same time.
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41
LIU Kun;LIU Liu;HE Ping;FU Bo;LI Fenggong
Application of Dynamic Control System With OffGas Analysis to 60 t Converter
The application of dynamic control system with offgas analysis to the 60ton topblown converter at Laiwu Iron and Steel Group Co., Ltd. is introduced. The main contents include the configuration of hardware system, data collection and communication, standardization of blowing process and dynamic control models.The following results were obtained: the hitting rates of carbon and temperature were 89% and 71% respectively, the simultaneous hitting rate of both C and T was 64% when the end point carbon content and temperature were in the range of 008%0.24% and 15801660 ℃, with an accuracy of controlling C and T were ±0.025% and ±20 ℃ respectively;In order to increase the simultaneous hitting rate of both end point carbon and temperature, it is necessary to improve the management of raw materials, carry out charging according to the charging model, adopt standardized operation and especially apply topbottom combined blowing technique.
2008 Vol. 43 (2): 41-0 [
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47
HUANG Fuxiang;ZHANG Jiongming;WANG Xinhua;FANG Yuan;YU Yan
Study of Surface Transverse Cracks on 304 Strip Produced by TwinRoll Strip Casting
The surface transverse cracks on AISI304 strip produced by twinroll strip casting were studied using optical microscopic observation and colored metallographic analysis,with consideration of the near rapid solidification characteristics of strip casting.The results indicated that the surface transverse cracks are formed during solidification. The prime reason of cracking is closely related to difference in solidification rate, of the surface,caused by level fluctuation in molten steel pool, cold scars and surface defects of rolls and so on. The tensile stress induced during subsequent cooling and coiling is the main reason for transverse crack expansion.
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压力加工
51
LI Yugui;MA Lifeng;HUANG Qingxue
Research on Rolling Shear With Single Axle and Asymmetric Negative Offset
A new plate cutting machine with single axle and asymmetric negative offset is introduced. The cutting force, compression force of crank arms, backward pushing force for remaining constant blade clearance are analyzed, and formula of asymmetry is deduced. Furthermore, the mechanical characteristics of the negative offset structure is analyzed and a method to determine negative offset range is presented. The theoryetical analysis and practice indicated that the asymmetric negative offset structure is important for increasing cutting quality and prolonging cutting edge life.
2008 Vol. 43 (2): 51-0 [
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56
MEI Ruibin;LI Changsheng;HAN Bin;LIU Xianghua
FEM Analysis of Slab Induction Heating
Induction heating of hot rolled slab at different frequency was analysed by finite element method. The results show that both frequency and slab shape have important influence on induction heating. The skin effect is not obvious at low frequency and the relation between eddy current penetration depth and frequency is δ∝ f-12. The maximum temperature is at top surface apart from symmetry axis. The maximum temperature moves to corner with the increase of frequency and proper frequency should be selected for different heating technology.The induction heating process was simulated according to a practical technology. The calculated results were compared with measured ones and the maximum deviation was lese than 4%,good enough for engineering. The analysis provides useful help for research and application of induction heating hot rolled slabs steel.
2008 Vol. 43 (2): 56-0 [
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61
SHAO Jian;HE Anrui;YANG Quan;SHI Naian
Research on Controlling Profile and Flatness of High Strength Pipeline Steel in Hot Rolling
With the wide use of strength pipeline steel, the profile and flatness of high strength pipeline steel plate becomes a subject of concern.Due to high strength of pipeline steel, low finishing temperature and great rolling force on each stand, the shape of the product is difficult to control. However, by use of LVC work roll and relevant work roll shifting and banding technology on upstream stands from F2 to F4, and long stroke roll shifting system on down stream stands, varying contact rolling technology on all the stands, the profile and flatness control for high strength pipeline steel product has been greatly improved on 2150 hot strip mill at Angang. The qualification rate of crown increased from 18.79% to 97.98%, and the roll changing period prolonged. Now, the mill is running stably.
2008 Vol. 43 (2): 61-0 [
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ZHANG Xiaohui;CHENG Xiaojun;ZHAO Jianluo;PENG Wei
Courses of Edge Wrinkling in Cold Temper Rolling and Countermeasures
The analysis on the edge wrinkling as well as the courses are presented. Both quantitative and qualitative analysis were made with edge thinning data from shape meter stored in Level 2 computer countermeasures are put forward for edgetrimming,rolling,annealing and leveling processes and raw materials management etc.
2008 Vol. 43 (2): 65-0 [
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68
WANG Yongtao;ZANG Yong;WU Diping;QIN Qin
Study on Vibration Mechanism of CSP Mill Caused by Chatter Marks
By site testing and data analyzing for F2 and F3 stands which vibrate more seriously, it was found that the frequency of the chatter marks is equal to the vibration frequency. The calculation result shows that the length of chatter marks on the roller and strip transferred on to rolling interface is equal to the contact arc length, which indicates that there is a direct relation between the chatter marks and the contact arc. Based on such observation, a mechanism of mill vibration was constructed. During the rolling process, chatter marks on the work roller are spreading from initial marks,making the mill vibration aggravated. This mechanism was supported by monitoring data,and is important for vibration prevention on same kind of mills.
2008 Vol. 43 (2): 68-0 [
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钢铁材料
73
ZHOU Xiaoguang;LIU Zhenyu;WU Di;WANG Guodong;LIU Xianghua
Analysis of Microstructure and Mechanical Properties of BG510L Strip Produced by FTSR
Considering the specifics of FTSR(flexible thin slab rolling), the chemical composition and rolling technology of BG510L steel were designed. Comparing the products of FTSR and traditional rolling process,it was shown, that the microstructure of BG510L strip produced by FTSR is finer; the strength is lower and the elongation is higher. By optimizing the chemical composition and rolling technology, the strength of BG510L steel produced by FTSR have been increased obviously with high stability of mechanical properties.
2008 Vol. 43 (2): 73-0 [
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77
YANG Gang;L Huisheng;DENG Bo;WANG Limin;LIU Zhengdong
Investigation of Blooming of Austenitic Stainless Steel Ingot by ECAP
High temperature solution treatment of ECAPed samples of austenitic stainless steel ingot was studied experimentally , and both microstructure and properties of ECAP + solution samples were compared with that of forging + solid solution samples, the results show that full recrystallized microstructure of samples ECAPed at room and elevated temperature was obtained after solid solution at 1150 ℃.The increase of ECAP pass number has no effect on grain size, however homogeneity can be improved.After ECAP + solution treatment, both microstructure and properties of cast austenitic stainless steel samples are as same as that of forging + solution ones, showing that ECAP is a suitable method to replace blooming.
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81
YIN Shubiao;LIU Qingyou;ZHANG Zhibo;SUN Xinjun;LEI Ting
Effect of Hot Deformation Parameters on Phase Transformation in Austenite NonRecrystallization Region of Niobium Steel
By using of ThermecomastorZ machine, the transformation of 0.128%Nb microalloyed low carbon steel in austenite nonrecrystallization region during continuous cooling was studied.The effect of the deformation parameters(deformation temperature, strain rate, strain) on the transformation was analyzed. The results indicate that transformation start temperature drops with the raising of cooling rate. when the cooling rate higher than 5 ℃/s, more than 90% of the structure is granular bainite. Increasing deformation temperature, enhancing strain and increasing strain rate can accelerate transformation.
2008 Vol. 43 (2): 81-0 [
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86
GENG Hongming;WU Xiaochun;MIN Yongan;WANG Hongbin;ZHANG Hongkui
Influence of Copper on Machinability and Corrosion Resistance of 4Cr16Mo Plastic Mould Steel
Experiments were conducted to determine the effect of copper on the machinability and corrosion resistance of 4Cr16Mo plastic mould steel. The machinability and corrosion resistance of 4Cr16Mo steel can be improved obviously by adding Cu.
2008 Vol. 43 (2): 86-0 [
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89
MA Yuxi;RONG Fan;ZHOU Rong;LANG Yuping;JIANG Yehua
Ductile to Brittle Transition of SuperHigh Nitrogen Austenitic Stainless Steel
The DBTT of superhigh nitrogen containing austenitic stainless steel was measured by Charpy impact test from roomtemperature to -60 ℃ , and the ductility and brittleness transition at low temperature was investigated by SEM, TEM and XRD methods. The results show that except a lot of fault ribbons and high density dislocations the structure of austenitic matrix is not changed during Charpytype test.The fracture is changed from dimple to dimple and cleavagelike to cleavagelike, and fracture mode is a mixed one with transgranular as primary.
2008 Vol. 43 (2): 89-0 [
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环保与能源
93
HAN Qinghong;JIN Yonglong;CANG Daqiang;SHI Lei;LIU Shuai
Study on Making Absorbent From Solid Waste for Low Concentration Sintering Flue Gas
According to the results of analysis of refining slag and coal ash , it is possible to use them as absorbent for low concentration sintering flue gas.A new method of preparing such absorbent by microwave heating was tested. Experimental results show that the absorbent has better desulfurization and denification capacity after microwave heating,with maximum desulphurization and denification rate of 53.8% and 53.6% respectively.
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装备与控制
97
C.Travaglini
Danieli COMBI Casters:Innovative Solution for Flexible Casting of Billets,Blooms and Slabs
Two examples of Danieli COMBI Casters are described,both can handle individually blooms billets or slabs and even both products simultaneously of Csteel and stailess steel.The feedback results from startup show that the two casters are equipped with state of the art technology,and enable the highest flexibility,cope with the needs of the market.
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