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2009 Vol. 44 No. 3
Published: 2009-03-15
综合论述
1
PAN Yifang;MEN Feng
Study on Accelerating Washing out Lagging Capacity of the Iron and Steel Industry
Lagging capacity of China iron and steel industry is an important cause of low product quality, high energy consumption and serious pollution. The main measures of washing out lagging capacity, the problems and reasons of these measures are presented. New measures to be implemented by are formed through controlling the market, by large and middle state owned steel plants to accelerate the washing out lagging capacity.
2009 Vol. 44 (3): 1-0 [
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原料与炼铁
6
FAN Xiaohui;GAN Min;CHEN Xuling;JIANG Tao;BAI Guohua
Experiments of LowBasicity Magnesian Oxidized Pellets
Lowbasicity magnesian oxidized pellets were obtained by adding magnesite and limestone to increase the basicity and magnesia content of pellets. The pellets had high strength,good reducibitity, low reducing swell and high softmelt temperature.When the magnesia content was up to 2.5% and the basicity to 0.2, compared with common acid pellets,the strength of pellets increased from 3167 N/p to 3517 N/p and the reduction degree from 7052% to 80.80%, the reducing swell decreased from 13.3% to 5.7%,and the start soft temperature,the end soft temperature,the meltdropped temperature increased by 34 ℃，33 ℃，110 ℃ respectively.The excellent reducibility and softmelting of the pellets reduce the gap between pellts and highbasicity sinter.
2009 Vol. 44 (3): 6-0 [
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11
ZHANG Tao;JIANG Tao;XUE Xiangxin
Industrial Experiment and Research of Improving Quality of Sinter With BoronBearing Iron Concentrate as Additive
The influence of boronbearing iron concentrate as additives on sinter quality under the production condition of the iron making plant of BX STEEL was investigated. The experiments show that baronbearing iron concentrate is an excellent additive to increase sinter strength, reduce sinter powdering rate, improve sinter grain composition and reductibility, without obvious effect on sinter TFe content.
2009 Vol. 44 (3): 11-0 [
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15
ZHENG Jianchun;CANG Daqiang;SHE Jingpeng;SHE Keshi
Thermal Test and Optimization of Heat Transfer Performance of Blast Furnace Copper Stave
Based on the thermal test of full size blast furnace copper staves, which proved that copper stave with composite cooling channel not only satisfy requirements, but also have good cooling effect and watersaving result, a 3D mathematical model of copper stave was established, and through the numerical simulation, good results of heat transfer performance of copper stave with composite cooling channel was proved by comparing with other copper staves with different cooling channels.
2009 Vol. 44 (3): 15-0 [
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18
DING Rucai;WU Keng;YIN Xiaoying;FEI Sanlin;HE Haixi;WEI Shaohua
Industrial Practice of Low Fuel Rate and High PCI on BF No1 at Shouqin
The technology applied to production facilities, automatic control as well as environment protection and energy saving at Shouqin BF No1 reached to a higher level. After realizing the designed capacity of blast furnace the quality of primary materials containing Fe and fuel are improved constantly, technology innovation and improvement have been adopted to solve the production problems caused by BF process. The capability and performance of the blast furnace have been optimized constantly. The fuel rate is less than 492 kg/t; however, rate of pulverized coal injection is over 180 kg/t. So the performance of Shouqin BF No1 is in the leading position at similar size BF in China.
2009 Vol. 44 (3): 18-0 [
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炼钢
24
ZHAO Zifeng;WANG Xinhua;ZHANG Jiongming;MEI Feng;KANG Jianguo
Study on Optimization of Mold Powder for Medium Carbon Steel Slab Casting and Plant Trial With Optimized Flux for Increasing Casting Speed
By increasing basicity and contents of CaF2 and Li2O, the mold flux for medium carbon steel slab casting was optimized.The optimized flux was adopted in plant trial of increasing castingspeed.The results showed that optimized flux has higher crystallization temperature，lower viscosity and melting point.In plant trial，liquid optimized flux thickness increased by 2 mm approximately，slag consumption increased by 0.03 kg/m2.At a casting speed of 13 m/min，heattransfer intensity，stability and slab quality cast with traditional flux were almost the same as cast with optimized flux at a casting speed of 15 m/min.
2009 Vol. 44 (3): 24-0 [
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LI Degang;WAN Xuefeng;LIAO Xiangwei;CAO Dong;JIA Jixiang;ZHAO Gang
Analysis on Oxygen PickUp in Molten Steel From Ladle Slag
Analysis of factors of oxygen pickup in molten steel and corresponding measures based on experimental data are presented. For oxidizing top slag, the change rate of w（［Als］） in the molten steel was ≥20%; but for reducing top slag, the change rate of w（［Als］） in the molten steel was ≤10%.The contribution of oxidizing top slag to oxygen pickup is more than that of air suction at the joint point of ladle and tundish.Reduction of slag takeover and modifying top slag can decrease the degree of oxygen pickup in molten steel; the tundish will not become a new source of increasing oxygen by ladle slag.
2009 Vol. 44 (3): 28-0 [
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32
HE Huanyu;NI Hongwei;GAN Wangui;LIN Lu
Sulfur’s Existence Form and SulfＰhase Forming Mechanism in Solidified Refining Slag
The process of the phase separation and sulfur’s existence as well as the sulfphase forming mechanism in solid refining slag were studied by means of micro and thermodynamics analysis. In the conditions of rapid cooling, the phases were separated completely, the forming sequence of phases was related to their thermodynamic equilibrium temperature, and the calciumaluminate was formed as basic phase due to its lower melting temperature. The forming mechanism of phases accorded with CaOSiO2Al2O3 phase diagram. The sulfur was enriched in the basic phase during separation forming complex phases at the boundaries with other elements of low melting temperature. The S2- and Ca2+ with lower electrostatic potential in complex sulfphases formed CaS, which carries replacement reaction with the basic phase to form calciumaluminate sulphide.
2009 Vol. 44 (3): 32-0 [
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36
CHEN Yong;LUO Xin;SHEN Houfa
Numerical Simulation on ThermoMechanical Coupling in Bloom Mold by Finite Element Method
A thermomechanical finite element model was established to analyze the heat transfer from mold to strand and stress distribution in strand based on the air gap resistance between solidified shell and mold by considering the influence of the mold flux on the thermal resistance among the strand, the flux film and the mold. The calculated strand shell thicknesses agreed well with the measured with a difference within 2 mm. The heat transfer in the mold and stress distribution in the bloom at different casting speeds were obtained by using the model. It was shown that when the casting speed was increased from 0.7 m/min to 0.9 m/min, the strand temperature became higher and the solidified shell thickness became thinner, which increased the cracking risk near the strand corners.
2009 Vol. 44 (3): 36-0 [
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40
ZHAO Zhongfu;YU Xinhe;HONG Jun;ZHAO Jiyu;YI Weidong;WANG Guoping
NonMetal Inclusion Control Technique for Tire Cord Steel
Tire cord steel is produced by oxygen converter, ladle furnace, vacuum degassing and billet casting processes at No.1 steelmaking plant, WISCO. The residual elements in steel such as S、P、Ti、As are controlled as low as possible. The extra low Al and Ti ferrous alloys are used during converter tapping, and acid ladle slag for refining processes. The dissolved Al in liquid steel, Al2O3 and MgO in ladle slag are limited strictly. The deformable, glassy and low melting point inclusions, which locate in the regions of plastic inclusions between anorthite and pseudowollastonite, and spessartite in CaOSiO2Al2O3 and SiO2MnOAl2O3 respectively, can be obtained. Meanwhile,the size and amount of undeformable inclusions such as Al2O3, (Mg,Mn)O·Al2O3 can be controlled as low as possible. TiN (TiCN) inclusions can be eliminated by controlling titanium and nitrogen content in steel.
2009 Vol. 44 (3): 40-0 [
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压力加工
45
LI Quan;LIU Zhengdong;TANG Guangbo;TIAN Zhiling
Process Optimization for CSP X60 Line Pipe Steel Strip Based on Microstructure and Mechanical Property Prediction Model
The thermomechanical coupled finite element model for simulating hot strip rolling was developed by use of commercial FEM software. The distribution of calculated equivalent plastic strain through the thickness direction in CSP rolled product was either of Vshape or Ushape. The rolling loads predicted by developed thermomechanical coupled FEM model had good agreement with the measured values. The uniformity of deformation during hot rolling could be improved by properly increasing the slab thickness and adopting large reduction rate in first several rolling passes. A set of integrated models for simulating microstructure evolution of Nbmicroalloyed HSLA steel was developed with microstructure and mechanical properties prediction technology, and the optimal CSP hot rolling process of X60 was built by using the developed integrated models.
2009 Vol. 44 (3): 45-0 [
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49
XIA Xiaoming;ZHANG Qingdong;DAI Jietao;ZHANG YongXue
Optimized Work Roll Contour on Upstream Stands of 1422 mm Hot Strip Rolling Mill
In Meishan 1422 mm hot rolling mill, the crown of some products for cold rolling exceeds lower limit, or exceeds upper limit, reducing crown hitting rate. Based on strip crown control on upstream stands CVC work roll contour of F1F3 was deeply analyzed, a new work roll contour—MHW work roll contour was designed. Using the FEM software ANSYS, the loading gap adjustment ability of CVC and MHW work roll contour was compared for different strip width. The practice showed that the strip crown has been redueed with optimized work roll contour.
2009 Vol. 44 (3): 49-0 [
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52
YANG Jingming;SUN Xiaona;CHE Haijun;LIU Chang
Neural Network Based on Ant Colony Algorithm for Rolling Force Prediction on Tandem Cold Rolling Mill
To improve the precision and efficiency of rolling force prediction on tandem cold rolling mill, a neural network model combined with ant colony algorithm is presented. The BP (Back Propagation) neural network model for rolling force prediction on tandem cold rolling mill was established according to rolling theory. Taking neural network weights and threshold values as decision variables, and neural network prediction error as objective function, the global minimum prediction error could be gotten through multiple generation computation of ant colony. Then training can be done by inputing the corresponding weights and threshold values to the neural network. Using field data on 1450 tandem cold rolling mill, the offline computation result showed that this method is capable of preventing local minimum of BP neural network, and has fast constringency. So it can be generalized in practice as a new method for rolling force prediction.
2009 Vol. 44 (3): 52-0 [
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56
ZHANG Dazhi;CHEN Yulai;JING Fengwei;LIU Sen;SUI Wenjie;CAO Pilei
Hot Strip Mill Coil Tension Control System Based on Siemens T400 Technology Module
Rigang 1580 mm hot strip mill is a set of fully automatic hot strip mill designed and manufactured by us. Coil tension control is very important for coil shape, products quality and related equipments. The function of traditional tension control system is designed in PLC and executed by drive system communicating with DP protocol. The traditional tension control system has many defects, such as slow response, low precision and more malfunction. T400 technology module especially designed for high precision tension control is used in the system. Closedloop tension control are designed and executed in drive system. System response speed is improved and fault points are reduced. This system has many merits, such as high precision, low control period，and so on. It is the first set of hot strip coil tension control system based on siemens T400 technology module and designed by us. The system is applied on Rigang 1580 mm hot strip mill and good results are obtained.
2009 Vol. 44 (3): 56-0 [
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钢铁材料
62
MIAO Chengliang;SHANG Chengjia;CAO Jianping;WANG Xuemin;HE Xinlai
Grain Refinement and Microstructure Control of HTP X80 Pipeline Steel
The technologyical points of grain refinement and microstructure control of HTP X80 were investigated by means of thermal simulation trial. Austenite recrystallization temperature zone and nonrecrystallization temperature zone were determined. The characteristics of phase transformation of high Nb HTP steel in continuous cooling process were disclosed. The research results have instructional significance to refine austenite grain, prohibit duplex grain structure, obtain ideal microstructure by cooling control.
2009 Vol. 44 (3): 62-0 [
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67
ZHU Tao;PEI Yinghao;LI Changyi;CHEN Qian
Microstructure and Magnetic Properties of NonOriented Electrical Steels Produced by CSP Technology
The microstructure, texture, precipitates and magnetic properties of three nonoriented electrical steels produced by CSP technology with different (Si+Al) contents (0.5%, 1.0%, and 1.5%) were investigated. The results showed that the microstructure of hotrolled strips and final product was of coarse homogeneous equiaxed grain structure, the average diameter of MnS and AlN precipitates in the hot rolled strip was about 150 nm, and the type of precipitates changed obviously as (Si+Al) increased. It was indicated that the magnetic properties of the nonoriented electrical steels were enhanced significantly by using of CSP technology.
2009 Vol. 44 (3): 67-0 [
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71
ZHOU Xiaofen;FU Renyu;SU Yu;LI Lin
Tensile Strain Hardening Behavior of FeMnC TWIP Steels
The strain hardening behaviour of FeMnC TWIP steel was investigated. It was showed there existed different n values in different phases during the tensile strain hardening of samples. There were also two strain hardening mechanisms: in the region of 0.4%3% strain, samples were strengthened by dislocation piling, but in the region of 10%50% strain, by twinning. In these two regions, the n value kept constant, However, n increased continuously in the region of 4%10%. The microstructure observation showed that the fractures of the FeMnC TWIP steel were typical ductile fracture pattern.
2009 Vol. 44 (3): 71-0 [
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75
ZHANG Lifeng;LI Shusen;WANG Jianwei;ZUO Xiangjun
Observation of the 3Dimensional Morphology of Inclusions Using Partial Acid Extraction
The 3dimensional morphology and composition of inclusions in a Alkilled steel were successfully revealed using the method of partial acid extraction. During partial acid extraction process, only the iron matrix reacted with the acid, and Al2O3 inclusions remained. Short time acid extraction did not change the composition of inclusions. The main inclusions in the current Alkilled steel were mainly 5200 μm Al2O3based inclusions with different morphology. The current work indicated that the partial acid extraction is an efficient method to achieve the 3dimensional morphology and composition of inclusions in steel.
2009 Vol. 44 (3): 75-0 [
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81
QIU Wenjun;LIN Gang;JIANG Laizhu;HE Guo
Effect of Cu on Properties of Antibacterial Austenitic Stainless Steel
The austenitic stainless steel with Cu was investigated in terms of antibacterial, corrosion and mechanical properties. The samples were prepared by vacuum melting hot rolling and antibacterial heat treatment followed by cold rolling and short time annealing. The steel exhibited good antibacterial property. As Cu content increases, the antibacterial property and the pitting resistance were improved. But, the strength decreased with increasing Cu content when the Cu content was below 3%. At higher Cu content, the precipitation strengthening dominated, leading to higher strength but lower elongation.
2009 Vol. 44 (3): 81-0 [
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环保与能源
85
PAN Liangming;JI Hongchun;CHENG Shuming;WU Chengbo;YONG Haiquan
Pressure Fluctuation Caused by Switchover and Pressure Control Method of LargeScale Regenerative Heating Annular Furnace
For HTAC (Hight Temperature Air Combustion) technology, pressure control and pressure fluctuation during combustion switchover are very important to the furnace reliability and stability. According to modeling theory, it was found that the pressure control could be realized by controlling the ratio of blasting capacity and induced draft capacity, and the best way is to control the induced draft of the tail duct. When the heating zones were switched over simultaneously, the average pressure fluctuation were within 35 pascals in the whole period, the lowest pressure was observed while outer ring was at blasting and inner ring was at induced draft stage. The highest pressure was observed in No.2 heating zone at the second switchover. The general pressure fluatuation was not high enough to affect the reliability of the furnace. With sequential switchover of all individual burners, the effect on furnace pressure will be minimized.
2009 Vol. 44 (3): 85-0 [
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90
XU Jinghai;FENG Junxiao;ZHANG Yongming;KONG Lingtan
Thermotechnical Measurement and Analysis for GrateKiln in Shougang Mining Company
A largescale gratekiln, was brought into operation smoothly at ShouduSteel with assistance of University of Science and Technology Beijing in 2000. Since then, the gratekiln has been developing rapidly in the country. In order to understand the phenomena inside the gratekiln comprehensively. The Shougang Mining Company, cooperated with University of Science and Technology Beijing, performed the thermotechnical measurement on the gratekiln No.2 system with capacity of 2 million ton pellets per year in 2006. The results of the measurement are introduced briefly which might be a reference for the pellets producers and kiln designers in China.
2009 Vol. 44 (3): 90-0 [
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装备技术
93
Thomas E Simmons;Andrea Contarini;Nonino Gianni
Deflection and Pressure Analysis of Oil Film Bearings
Recent tests on rolling mill oil film bearings have indicated that the oil film thickness is three to five times greater than predicted by computer models. It has been implied that the increase in oil film thickness is due to the deflection of the sleeve and bushing, which would spread out the pressure field increasing the oil film thickness. If the oil film thickness is three to five times greater than expected, the maximum operating load can be increased taking advantage of the inherent safety factor in the bearing.To confirm the test results, DanOil engineers modeled the sleeve deflection produced by the hydrodynamic pressure field and then used this deflection in a sophisticated bearing computer program to calculate the new pressure field. The iteration of the pressure field and deflection was continued until the model converged.The paper presents the method of analysis and the results.
2009 Vol. 44 (3): 93-0 [
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技术交流
97
LIU Maolin;FAN Dingdong;XU Anjun
Control of Surface Quality of Cold Rolled and Hot Dip Galvanized Strip From Hot Strip Produced by CSP
It is very important and difficult to control surface quality of cold rolled and hot dip galvanized strip from the strip produced by CSP. Different kinds of surface defects are observed on the surface. For removing defects, defect types, working procedure and control points must be determined firstly. A kind of surface defect is described, and the reasons and control methods are discussed in detail. The parameters of secondary refining and thin slab casting were adjusted，to control surface defects of hot dip galvanized strip effectively.
2009 Vol. 44 (3): 97-0 [
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