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2010 Vol. 45 No. 1
Published: 2010-01-15
综合论述
1
A Proposal to Establish a Platform for Manufacturing High-efficiency and Low-cost Clean Steel
according to the definition of clean steel, a great significance in establishing a clean steel manufacturing platform is clarified. The technical index of new production process of clean based on hot metal pretreatment is analyzed and compared with that of traditional process of taking secondary refining as main body. In traditional process, there are four basic contradictions such as resulfurization, dephosphorization in melting low carbon steel, deoxidization and inclusion control, and strong reducing refining, which have an influence on production cost and energy consumption. To solve there problems, a platform for manufacturing high-efficiency and low-cost clean steel should be established. The platform must focus on full hot metal pretreatment, less-slag smelting, high-carbon taping, vacuum carbon deoxidization and change of inclusion floating, and so on.
2010 Vol. 45 (1): 1-1 [
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原料与炼铁
10
Investigation and reason analysis of shaft accretion formed in blast furnaces of Pansteel
It introduces accretion formed at the upper shaft No. 2 BF in pangang . petro- graphic characteristics and features of compositions of accretion and change of material and fuel during accretion formed were analyzed , Reason of accretion formed was found,some suggeestion for decrease accretion formed are brought.
2010 Vol. 45 (1): 10-10 [
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14
Mathematical model of burden width in a bell-less top blast furnace and modeling experimental research
Opinion’s concerning the uncoordinated principle between the burden width and burden trajectory width in process of iron-making, and it is fluctuated to the flows distribution of CO after charge of bell-less top to the instable status of blast furnace. In the mathematical model of burden width, it is emphasized the force to width of burden trajectory from a kinematic view point. Analyzing effect of Coriolis force to calculate burden width and a deviate angle of maximum burden velocity, reducing error rate of horizontal width, raising segment calculate the width of burden trajectory. The mathematical model is established. To adopt industrial model experimental on the ratio of 1:10 blast furnace, it is Validated to the numerical model of burden width is right and ration. After applied mathematical model in a 2500 cubic meter blast furnace, it is validated to burden file ration, flows stabilizing, and blast furnace smoothly working.
2010 Vol. 45 (1): 14-14 [
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19
Deoxidation Kinetics of 1mm ~3 mm Ore Fines with H2
Experiment was conducted in a self-prepared kg-scale high temperature fluidized bed for kinetics of 1 mm~3mm ore fine reduction with hydrogen. The utilization degree of gas decreases with reaction, which shows that the reaction is rapid during the beginning of deoxidation process, while slower with time. The higher the reaction temperature, the more the utilization degree of gas, but the difference of utilization degree at various temperatures shortens with time. The utilization degree of gas is 9%, and the metallization degree reaches 84% for 20min deoxidation process at 750℃，which shows the deoxidation reaction with hydrogen is very rapid. The almost linear increases of metallization degree with gas velocity, which shows the deoxidation reaction with hydrogen is very rapid further. So, much higher velocity of reducing gas can be allowed to improve the productivity of facility when hydrogen as reducing gas compares to CO gas. Metallization degree decrease s while utilization degree of gas increases gradually with the height of charge increasing. The reaction temperature can drop to 700~750℃ with hydrogen as reducing gas, which can avoid the sticking problems of fluidized bed.
2010 Vol. 45 (1): 19-19 [
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24
蒋大军 JIANG DA-jun
Mineral property & Agglomeration Intensification Technology of Vanadium and Titanium Magnetite Concentrate
Vanadium and titanium magnetite is a ores with the complex mineral composition so that it is difficult to beneficiate,sinter,smelt. specially , the beneficiation is very difficulty, and its products is low-grade iron and high TiO2 in Panzhihua.the grade of iron 2-2.5% was increased by stage-grinding-stage-concentration technology ,but TiO2 was no lower.The Concentrate with the characteristics in "low iron, low silicon, high titanium, high aluminum, high-ferrous, high-sulfur, high melting temperature"，at the same time ,so the sintering permeability is influenced because granulation capability is worse due to concentrate coarse particle size . The strength and metallurgical properties were affected severely as sinter liquid was less and complex mineral composition owing to high melting temperature point of concentrate.Vanadium titanium magnetite concentrate sintering and smelting blast furnace have made significant technological breakthrough and its’ utilization level and value significant results were obtained by using of quicklime to strengthen granulation technology, increasing sinter basicity, adding ordinary ore to lower TiO2, using high negative pressure-high winds ect.
2010 Vol. 45 (1): 24-24 [
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炼钢
28
GENG Dian-Qiao Ji-Cheng HE
Effect of Different Bottom Blowing Locations on Decarburization Process in Vacuum Degasser
The numerical simulation method was employed to study the effect of different bottom blowing locations on fluid flow and decarburization process in vacuum degasser. The numerical results indicated that the double bottom blowing is the most effective method for decarbonization, the eccentric bottom blowing has a minor effect, and the centric bottom blowing is the poorest method. For the eccentric bottom blowing, the decarbonization efficiency is the highest and the terminal carbon concentration falls down to 39ppm when the eccentric distance of bottom blowing location is between 0.4R～0.5R. For double bottom blowing, the decarbonization efficiency is the highest and the terminal carbon concentration falls down to 25ppm when the eccentric distance of bottom blowing location is between 0.5R～0.65R. Furthermore, the terminal carbon concentration on the condition of double bottom blowing is 18～45 percent lower than that on the condition of eccentric bottom blowing.
2010 Vol. 45 (1): 28-28 [
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32
Application of solidification model to Static Soft Reduction
Based on the measured surface temperature of the bloom, mathematical model for solidification heat transfer is presented according to modifying the heat transfer coefficient of different cooling zone and the calculating results of the model are applied to the static soft reduction well. The following results are obtained: the best casting condition for soft reduction is liquid steel overheat 10~30℃、secondary intensity 0.28L/kg、casting speed 0.85m/min and reduction amount 8mm; using soft reduction technology can decrease the grade of center porosity from 2.0~2.5 to 1.0~1.5, improve the V-shape segregation and center shrinkage cavity, and also decrease the center average carbon segregation index of the bloom from 1.17~1.26 to 1.07~1.13.
2010 Vol. 45 (1): 32-32 [
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37
王翠娜 WANG Cui-Na WEN Liang-Ying WEN CHEN Deng-Fu CHEN ZHANG Da-Jiang ZHANG PENG Zheng PENG JIN Xing JIN
Effect of Bottom Structure of Submerged Entry Nozzle on Flow Filed and Temperature Field in Continuous Casting Mold
Based on the structure parameters of one steel plant mold and submerged entry nozzle (SEN) for slab continuous casting, 3-D numerical model which describes the flow and heat transfer of liquid steel in mold has been carried out. Commercial software FLUENT was used to simulate coupling flow field and temperature field of the molten steel, the effects of bottom structure of SEN on the flow field and temperature field of molten steel were analyzed and compared. These research results indicated that: near the outlet of convex SEN , the molten steel velocity is relative high and the impact depth is deep, which enable high temperature region to shift down and go against the growth of solidified shell; the free surface velocity and temperature of flat bottom SEN is relative high, which is beneficial for mold flux melting but can lead to the opening of slag layer; the free surface velocity and temperature of concave SEN velocity is relative low, which is beneficial for the liquid level stabilizing. These research results can be used for the design of SEN as reference.
2010 Vol. 45 (1): 37-37 [
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43
JIANG Li-Hong
Spring Steel Billet Centerline Segregation Study
In order to discuss the effects of vacuum refining and superheat on spring steel slab centerline segregation, two production process are introduced: converter→LF→VD→continuous casting and converter→LF→continuous casting, and separately adopt different degrees of superheat at 30℃ and 22℃, to produce 60Si2Mn spring steel CC slab. Two samples are taken in spring steel rectangular CC slab, and analysis the segregation of element C and S, and compare with them. It can be seen: after vacuum refining, the biggest carbon segregation index dropped to 1.25 from 1.55； the largest sulfur segregation index dropped to 1.45 from 2.68..
2010 Vol. 45 (1): 43-43 [
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46
GENG Ming－Shan Jiong－ming Zhang LIU Zhi-ming
Study of Surface Blow hole Defects of Continuous Casting Slab
In this paper, the influencing factor of the blow hole defect in continuous casting slab and hot rolled plate was analyzed. The main reason of surface blow hole defect in continuous casting slab is that the argon gas insufflate the mold from the upper nozzle, argon sealing and submerged entry nozzle cannot float effectively. The argon blow hole was captured by solidified continuous casting slab shell and induced the surface blow hole defect in continuous casting slab. The blow hole mostly distributed to the wide-face shell edge near the narrow side position. The blow hole quantity in the center of wide-face and the 1/4 of wide-face shell is few. The surface blow hole defect in continuous casting slab and hot rolled plate can be eliminated by utilizing no argon blowing.
2010 Vol. 45 (1): 46-46 [
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压力加工
51
Dian-hua ZHANG Dan YAN LI Xu
Research and Application of Q Prediction Feedforward AGC in Hot Tandem Rolling
Aiming at the main factors causing thickness fluctuation of hot strip, this paper presents a Q prediction feedforward AGC strategy considering the influence of plasticity coefficient changes. Gap compensation algorithm of feedforward AGC is derived based on P-H diagram, and a strip tracing scheme between stands is given taking into account the varitation of the loop，and the linear method of plasticity coefficient Q prediction is put forward。The site application results show that the strategy of Q prediction feedforward AGC has remarkable effect on decreasing thickness deviation of hot strip.
2010 Vol. 45 (1): 51-51 [
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54
SUN Wen-Quan
The Derivation and Analysis of the Coupling Model With Disturbance for Single Stand Cold Rolling Mill
The study on coupling relationship among shape, gauge and tension is a important question for discussion in thinner strip cold rolling process. This paper establish the shape ,gauge and tension coupling model with disturbance for single stand cold rolling mill based on systematic and theoretical analysis all of the control elements and disturb elements affecting shape, guage and tension. By calculating the infection of each element, it reflects the characteristic of single stand cold rolling mill. Then, the simulation results of the coupling characteristics and diturb response characteristics show the necessity of the anti-jamming and decoupling design.
2010 Vol. 45 (1): 54-54 [
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60
Simulation analysis of Microstructure Evolution of Non-quenched Steel during RSM
Based on the commercial software MSC．Marc, secondary development happened, FE models for RSM of non-quenched steel are set up. Subroutines of non-quenched steel microstructure evolution are exploited, and structure property variable regular of non-quenched steel during RSM process is exploited.
2010 Vol. 45 (1): 60-60 [
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64
Research on Surface Hardness Control Technique for SUS 301 and SUS 304 Stainless Strip Cold Rolling
Technological process and technological parameters of SUS 301and SUS 304 harden temper stainless strip were investigated based on production facility and technics. Technological parameters of surface hardness correlation during cold rolling were analyzed; adjustments of technological process were established; predicting model of percent reduction was built by BP neural network; technology of control surface hardness belonged to BaoXin Company Limited was brought out. After the application of technological process and technological parameters, surface hardness precision was improved.
2010 Vol. 45 (1): 64-64 [
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钢铁材料
70
Development of Rolling Process for 400 MPa Fine Grained Steel Rebar
Abstract：In order to improving steel quality and reducing production cost, more and more factories consider the refining grain steel process to be one of the best choose, that not only increase steel strength, also improve plasticity and toughness of steel rebar. According to our conditions of product line, the 400 MPa fine-grained steel rebar of 20MnSi with ferrite grain size of 5-10 μm was successfully developed by adjusting the chemical compositions and new design of deformation parameters of finite roll pass, and by new process with controlled rolling and cooling techniques.
2010 Vol. 45 (1): 70-70 [
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74
Hui-ping REN Zi-li JIN Bo YAN
Microstructure Evolution and Second Phase Analysis of Cold rolled Thin Steel Strip Produced by CSP Process
The microstructure evolution of cold rolled thin steel strip produced by CSP process was studied by metallographic microscope and QUANTA-400 environmental scanning electronic microscope. At the meantime time, the chemical composition, quantity and partlcle size distribution of cold rolled thin steel strip produced by CSP proeess were studied by chemiea phase analysis and SAXS method with a 3014 X-ray diffracto-spectrometer and a Kratky small ang1e scattering goniometer.The results show that the quantity of duplex impurity in CSP thin slab is minute. The size of crystal grain of the steel strip side along the width direction during continuous casting and continuous rolling,cold rolling and annealing is finer than that of the steel strip center and the phenomenon is more obvious duing continuous casting and continuous rolling than during other processes. The cleanliness of CSP hot rolled strip for cold rolling is high. The precipitated phases in cold rolled and annealed thin steel strip are nano-scaled M3C and nano-scaled MC.The amount of nano-scaled M3C in cold rolled thin steel strip after annealing is about 26 time more than that of nano-scaled MC in cold rolled thin steel strip after annealing.
2010 Vol. 45 (1): 74-74 [
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79
Wang Cunyu Han Dong
Effect of Q-P(-T) Process on the Microstructure and Mechinicial Property of 35Si2Ni2 Steel
The effect of “Quenching-Partitioning-(Tempering)(Q-P(-T)) process on the microstructure and mechinicial properties of 35Si2Ni2 steel were investigated in this paper, and compared with traditional Quenching-Tempering(Q-T) process, Microstructure was studyed by using SEM, TEM and XRD. The results show that, compared with traditional quenching-tempering process, samples treated by quenching-partitioning get more retained austenside, the strength decrease slightly, while the ductibility and toughness improved markedly. Retained austenside of the samples treated by quenching-partitioning-tempering process decomposited and ε carbides precipitated, which result in the increasing of yield strength, as well as the yield ratio.
2010 Vol. 45 (1): 79-79 [
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83
Fang He XinJun Sun Jinzhong Xiang
Impact of Annealing Tenperature on Morphology and Mechanical Properties of High Strength Cold Rolled Plate
Abstract: In this study ,we mainly researched the impact of annealing temperature on mechanical properties of high strength cold rolled plate Q235. The steel was studied by means of optical microscope, TEM. the results shows that the grain size of ferrite grow up as annealing temperature rise, but the horizontal grain size grow up slower when annealing temperature between 600℃-640℃。It is found that there were lots of precipitate particles, the TEM diffraction spots shows the particles are cementite particles. The size distribution of these precipitate particles was counted. At last, the mechanical properties of annealed plate were tested by sample tension test.
2010 Vol. 45 (1): 83-83 [
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Research and application of TMCP on the production of high-strength structural steel
By thermal analogue, the static recrystallization, dynamic continuous cooling transformation of higher-strength hull structural steel were studied，and the main process factors which influence the structure and properties of plate, the TMCP of higher-strength hull structural steel has good cryogenic temperature impact toughness and welded properties, and the average grain size of the plate can reach ASTM No.11~13 grade.
2010 Vol. 45 (1): 87-87 [
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Effect of Heat Treatment on Mechanical Properties of Bearing Steel 20Cr14Co12Mo5
The relationship between microstructures and mechanical properties of bearing steel 20Cr14Co12Mo5 are researched with different heat treatment in this paper. The results show that microstructures and mechanical properties are influenced by heat treatment With different heat treatment, the mechanical properties of the bearing steel can obtain HRC 51.0, σb～1840MPa, σ0.2～1410MPa, δ～17%,ψ～ 62.5%,Aku～75 J•cm-2,KIc～108MPa•m1/2 .
2010 Vol. 45 (1): 91-91 [
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环保与能源
96
QIAN Hui
Study of Coke Making Experiments With Different Waste Plastic Blending
Coke making experiments with different waste plastic such as PE, PP, PET, PS, and PVC after dechlorination were carried out in 20kg coke oven. The influence of different waste plastic on the coke strength, CRI and CSR was studied based on co-carbonization behavior between coal and waste plastic by using thermo gravimetric analyses as well. The result showed that the temperature range of decomposition and DTG curve distribution of different individual coal and waste plastic determined the coke properties. Coke strength produced from high rank coal decreased after blending with all kinds of waste plastic. Among all tested waste plastics, PS and PET showed worse co-operation with coals in coke making process.
2010 Vol. 45 (1): 96-96 [
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99
Li Hong-Fu Yan-ming WEN De-min SUN
Investigation into Feasibility of power use self-support in Iron and Steel Enterprise
Through the systemic analyse of energy flow and main worthy residual heat and energy in typical iron and steel enterprise,this article discussed the feasibility of power use self-support by using advanced technology to generate electricity.
2010 Vol. 45 (1): 99-99 [
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技术交流
104
Role of Shock Wave in Steelmaking of Converter
Shock wave is the non-consecutive boundary layer of liquid property in supersonic flow. Airflow pass through the shock wave speed decreased, temperature and pressure rise. Oxygen is blown into converter through ultrasonic jet by Laval nozzle. Loss of shock wave should be decreased when design oxygen lance nozzle and oxygen blowing system. In order to obtain good metallurgical effect, shock wave should be controlled at suitable range at some special blowing process. Nozzle should not be applied if property of nozzle jet deteriorated when it eroded seriously.
2010 Vol. 45 (1): 104-104 [
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