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2007 Vol. 42 No. 12
Published: 2007-12-15
综合论述
1
FU Jie;CHAI Yizhong;MAO Xinping
Problems of EAF Steelmaking in China
Development of EAF steelmaking in China is reviewed. Because the scrap and the electric power are in short supply, the difficulty of EAF steelmaking is that the EAF steel cost is higher than that of converter steel. And this has resulted that the rate of EAF steel is decreasing year after year, as second case since 1990 in China. There are three measures to deal with this difficulty the first one is producing high added value steel, the second one is shortening the tap to tap time and decreasing cost by adding a part of hot metal and using more oxygen in EAF steclmaking; and the third one is guiding the steelmaking plants to carry out the second round investment to develop the modern electric arc furnace.
2007 Vol. 42 (12): 1-0 [
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原料与炼铁
7
ZHAO Pei;GUO Peimin
Thermodynamical Study on Reduction of EnergyStored Iron Ore Powder
Energy storing mechanism and thermodynamics of reduction of mechanically milled iron ore powder were studied. Particle size of ore powder can not be refined infinitely by milling, but its microcosmic crystallines can be refined gradually until amorphous structure is formed.The stored energy of iron ore consists of surface energy, crystal boundary energy and dislocation energy, with crystal boundary energy as the major component, and contribution of surface energy is small. The equilibrium content of CO or H2 for reducing energy stored magnetite and wustite is decreased, so it is advantageous to improve gas efficiency,reduce reduction temperature of energy stored iron ore by coal.
2007 Vol. 42 (12): 7-0 [
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11
CHU Mansheng;GUO Xianzhen;SHEN Fengman;YAGI Junichiro
Development and Application of MultiFluid Blast Furnace Model
The multifluid blast furnace model was developed on basis of multifluid theory, thermodynamics and kinetics, transport theory and computational fluid dynamics. The framework, discretizing method, settingup of boundary conditions, and solution procedure of the model are introduced.The multifluid model was used to simulate a given blast furnace, giving twodimensional distribution of temperature and velocity, and the accuracy and efficiency of the model were testified by comparing simulation results with measured data. Generally, multifluid model is a useful tool to simulate blast furnace operation, describe the process, and predict the performance of blast furnace.
2007 Vol. 42 (12): 11-0 [
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16
LI Chuanhui;AN Ming
Development and Application of Charging Technology of SmallSized Sinters on No.1 BF at Jisteel
In order to reduce cost of raw materials and relieve sinter supply, according to technology and equipment conditions,a charging technology for smallsized sinters （3~5mm）was developed on No.1 1750 m3 BF at Ji’nan Iron and Steel Co.,Ltd.,The technology was adopted from March to August in 2005 and it was proved that the BF operation and indexes were improved. At the same time the conditions of stabilizing furnace profile and protecting cooling equipment were provided.
2007 Vol. 42 (12): 16-0 [
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炼钢
20
HE Ping;LIU Liu;YIN Weiping;LIU Hongbo;TAO Chuanjun
Development of Dynamic Control System of BOF With Laser Gas Analyser
A new BOF dynamic control system was developed with laser gas analyer. The system has less investment, less trouble, better performance and shorter delay time than that with mass spectrometer. The dynamic control model of BOF was established based on metallurgical kinetic theory. The results proved that hit rate of ［C］ is 80.9% with error less than ±0.02% at end point.
2007 Vol. 42 (12): 20-0 [
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25
CHEN Benwen;LI Hong;CHANG Guihua;YANG Liang
Effect of Different Refining Processes on Inclusions
The inclusion and gas content in molten steel and slabs of J55 steel grade for oil casings were researched with two processes: LDRHLFCC and LDLFCC respectively to study the effect of inclusion and gas content on mechanical properties of final products. The experimental results show that inclusion content in molten steel and slabs and quality of final products produced by two refining processes are at the same level.Thus the production cost can be cut down by adopting LDLFCC.The results offer theoretical basis for process design of new steel grades.
2007 Vol. 42 (12): 25-0 [
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29
LONG Chuanjiang;CHENG Jinsong;ZHAN Dongping;WAN Junfeng
Development of Compound Passivated Magnisium Powder for Hot Metal Predesulfurization at Baosteel
Passivated magnisium powder is widely used in hot metal predesulfurization. A new compound passivated magnisium powder was developed with a new process. The powder of which burning point is 650 ℃, mean repose angle is 26° and average combustion inhibiting time is 25.7 s,is used for hot metal pretreatment at Baosteel,with good effects. The sulfur content of hot metal after predesulfurization is decreased to lower than 0.003%, and the lowest sulfur content is 0.001%.
2007 Vol. 42 (12): 29-0 [
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32
YANG Zhenguo;LIU Qing;DONG Jieji
Optimized Ｃonfiguration of AlloySteel Bar Production Using EAF Process
With the development of the alloysteel and continuous casting technology at home and broad in recent years,the authors put forward some suggestions for the alloy steel bar production by using EAF steelmaking process.And the practicability of matching eight kinds of EAF with continuous casters and rolling mills to produce modern bar is also discussed.The popular trend in the world in EAF steel manufacture process (1 EAF→1 refining furnace→1 continuous caster→1 main rolling mill) is that the capacity of over 100 tons EAF is widely used.But this is too high,and it will need too many cast strands of the continuous caster on the one hand and too bigger form of section on the other,which will impose difficulty on providing the suitable rolling mill to match with it.As a result,this EAF suits the plate plant better rather than alloy bar plant.Based on the current fact that the special steel plant uses EAF to produce machinery and the products are more used in the automobile industry,5090 tons EAF is the reasonable choice to produce bar steel, and the production scale should be limited to 40×104×90×104 t/a.
2007 Vol. 42 (12): 32-0 [
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38
WU Ming;WU Fada
Application of Using Dynamic Control With Offgas Analysis for Making MediumHigh Carbon Steel
The application of dynamic control with offgas analysis for making mediumhigh carbon steel on 95 t converter at Ma′anshan is presented. Suitable methods of charging, slagging and blowing were established, the rate of dephosphorization was improved. Accordingly, the rate of CT hitting at blowing end was increased from 30% to 85% for steels with C in the range of 0.10%~0.16% and P less than 0.012%.The steel quality was improved, the rate of slopping was decreased, the cost was reduced.
2007 Vol. 42 (12): 38-0 [
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42
WU Wendong;PENG bo;DAI Bin;ZHANG Qihuan
Study and Practice of HighEfficiency Oxygen Blowing Technology on Converter
In order to increase the output, a new oxygen lance for 70t converter was designed. Intensity of oxygen supply can be increased to 4.0 m3/(t·min). At the same time the slagging and oxygen supplying operation were optimized. The new oxygen lance is helpful to stabilizing the blowing process,obtaining good technico economical indexes and increasing steel output by 20%.
2007 Vol. 42 (12): 42-0 [
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压力加工
45
SHI Rong;ZUO Hong;QI Xiangdong;HUANG Chuanqing;JIANG Guangbiao
Development of New Producs and Capacity Evaluation of 2050 CVC Rolling Mill at Baosteel
In order to study the load of 2050CVC mill at Baosteel during rolling highstrength steels, especially X70、X80 pipe linesteels and container plate the parameters of F1 and F4 such as rolling force, rolling moment and torque magnification were measured and the capacity of rolling mill was assessed.The results provide a reliable basis for making production plan.
2007 Vol. 42 (12): 45-0 [
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49
WANG Xuezhi;LI Quanhan;DAI Wenli
Research of Relationship Between Plate Mill Stiffness and Workpice Width
The operation data were used to analyze the spring characteristics of 2500 mm plate rolling mill for different workpice width, and to obtain a practical stiffness model. The results show that when the width of rolling piece is larger than the half of roller barrel length, the decrease of the mill stiffness is nonlinear,the more the workpice width, the more attenuation of the mill stiffness is.
2007 Vol. 42 (12): 49-0 [
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53
L Zhiqing;ZHAO Jun;WANG Zhenhua;REN Ligou;FU Wantang
FEM Analysis and Experimental Study of Deformation Nonuniformity After Hot Compression
The hot compression of an eutectoid pearlite steel at 700 ℃ was simulated with finite element method (FEM) at a strain rate from 0.1 to 100 s-1. The distribution of efficient strain and strain rate in axial section of deformed samples was analyzed. The coincident region of practical with set conditions was determined and approved by metallographic examination. The results indicate that the efficient strain and strain rate are higher by about 40% than in the center of deformed samples,but are about 1/5~1/4 of set values at the end surface; The practical strain and strain rate accord with the set values at 2/53/5 distance from the end surface to the center of deformed sample, and the consistency between practical and set values is reached at 1/2 distance from the end surface to the center.
2007 Vol. 42 (12): 53-0 [
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钢铁材料
57
WEI Libo;ZANG Yong
Study on WebWave Formation in HBeam During Hot Rolling
The mechanism and conditions of webwave formation during hot rolling of HBeam were studied. First, the critical stress and strain for buckling of the web were obtained by analytical method. Then, the finite element model was established to analyze the rolling process based on elasticplastic finite element method with software of MSC.Marc, and the formation of HBeam’s webwave was simulated successfully.The deformation and stress during hot rolling were clarified.Some parameters of forming web buckling such as halfwave length and the critical ratio of relative reductions between the web and flange were obtained.
2007 Vol. 42 (12): 57-0 [
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60
LI Changyi;CHEN Qian;LIU Zhengdong;TANG Guangbo;ZHU Tao
Texture Evolution of NonOriented Electrical Steel in CSPCold RollingAnnealing Process
Texture evolution of nonoriented electrical steel produced by CSP technology in cold rolling and annealing process was investigated by using of orientation distribution function (ODF) determination. The results show that the texture intensity in hot rolled nonoriented electrical steel strip decreases after cold rolling and annealing. The major orientation fibres in cold rolled electrical steel strip remain the same as in hot rolled strip, along <011>. The textures of annealed strip distribute uniformly. The grain orientation of steel strips turns from α fibre texture to γ fibre texture during cold rolling. The influence of (Si+Al) content on texture in cold rolled and annealed steel inclines to be weaker,with (Si+Al) content increasing from 1.0% to 1.5%.
2007 Vol. 42 (12): 60-0 [
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64
MA Yuxi;RONG Fan;ZHOU Rong;LANG Yuping;JIANG Yehua
Study on Precipitation in Austenitic Stainless Steel 18Cr18Mn2MoN During Isothermal Aging at 900 ℃
The precipitation of nitrides(carbides) in solution treatment and aging process of 18Cr18Mn2MoN high nitrogen austenitic stainless steel was investigated by use of metallographic and electron microscopical analysis. The results show that precipitation process of Cr2N is divided in three steps:first, precipitation of chainlike Cr2N along grain boundaries;Second,precipitation of cellular Cr2N at meeting point of three intergranulars and a small amount of Cr2N precipitated in transgranularly;third, Cr2N precipitates grow from grain boundaries into grain gradually and are connected with trans granular Cr2N forming tablets and cover whole grain.with nitrides precipitation,σ,x and γ′ phases are formed.The precipitation mechanism is discussed.The crystalline structure of precipitates and orientation relationship between precipitates and matrix were studied with transmission electron microscopy(TEM) and selected area electron diffraction(SAD).
2007 Vol. 42 (12): 64-0 [
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73
YANG Hongmei;WANG Xiangdong;LU Ji;CHEN Xiaoping;WU Xinghui
Effect of RE on Atmospheric Corrosion Resistance of PhosphorusBearing Steel
The corrosion rate of the phosphorusbearing steel was measured by dry/wet alternate immersion test. The formed rust layer was studied by of XRD、SEM and polarization test. The results showed that adding RE in the phosphorusbearing steel is able to improve corrosion resistance of the steel.due to formation of compound deposited on anode from Ce3+、Ce4+ and La3+ ions and PO43-、H2PO4-、SO42-.
2007 Vol. 42 (12): 73-0 [
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73
MI Zhenli;TANG Di;JIANG Haitao;DAI Yongjuan;WANG Haiquan
Twins Observation During Deformation of Fe28Mn3Si3Al TWIP Steel
The microstructure of Twinning Induced Plasticity (TWIP) steel during tensile deformation was investigated with SEM and TEM. The results showed that the twins deformed firstly with workhardening, then other grains turn to favorable orientation to complete further deformation. This deformation mechanism of twinning induced plasticity provides excellent elongation with nonecking phenomenon. The orientations of first deformed twins are transferred to annealing twin’s hereditarily. The twintwin interaction, the twindislocation interaction and the twinsliding interaction play an important role during deformation.
2007 Vol. 42 (12): 73-0 [
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77
LI Hui;GAO Lingqing;SUN Jianke
Effects of High Strain Rate on Tensile Properties of 10Ni5CrMoV Hull Steel
Effect of strain rate on room temperature tensile properties of 10Ni5CrMoV hull steel was investigated at the strain rates between 1.6×10-31.2×103s-1.The experimental results show that strain rate doesn’t affect the fracture mechanism of intragranular dimple and mainly dislocation slipping；the tensile strength is increased slightly along with the increase of strain rate，however，the elongation doesn’t decrease in general which is decreased firstly and raised later with the increase of strain rate，the high strain rate doesn’t embrittle the 10Ni5CrMoV steel.The experimental results can be explained by dislocation slipping.
2007 Vol. 42 (12): 77-0 [
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环保与能源
81
DAN Zhigang;CANG Daqiang;ZHOU Huimin;BAI Hao;ZONG Yanbing
Preparation and Application of High Emissivity Coating on Regenerator of Hot Blast Stove for Energy Saving
A new micronanometer coating on regenerator of hot blast stove for energy saving was prepared by ultra fining technology. The results showed that the emissivity of coatings is 0.93 and its thickness is about 300 μm. Application of hot stoves with such regenerators to 350 m3 and 1750 m3 BF indicated that the coating makes the blast temperature increase by 57 ℃ and 28 ℃ respectively, reduces the fluctuation of blast temperature, leads to a fuel saving of 10% due to intensification of heat radiation convection,and increasing heat conductivity of bricks resulting in increase of heat capacity of the regenerator, It can be seen that application of such coating gives good economic benefits.
2007 Vol. 42 (12): 81-0 [
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装备与控制
85
A.Zanon;C.Williamson
DanOil Hydrodynamic Bearings for Top Quality Flat Products
The application,principle of operation,components and lubrication system of Danoil hydrodynamic bearings for top quality flat products are introduced.The bearing should be reliable,compact to ensure reliabitity of stands.Danoil bearings satisfy this demand.
2007 Vol. 42 (12): 85-0 [
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