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2010 Vol. 45 No. 4
Published: 2010-04-15
综合论述
1
Comment on Behavior of Energy Flow and Construction of Energy Flow Network for Steel Manufacturing Process
The physical essence of the dynamic operation of steel manufacturing process is described in this paper. It is pointed out that in the steel manufacturing process, the ferrogenious flow is accompanied by energy flow, but the energy flow sometimes operates with ferrogenious flow, sometimes operates separately. And there is not only ferrogenious flow network and related operating program, but also the energy flow network and its program, which related with ferrogenious flow transform. It is stressed that the material balance and heat balance are not the only way for studying the function of energy conversion. The new concept of dynamic input-output and the energy flow network should be used to further promote the energy-saving and emission reduction work in steel plants. The operation dynamic mechanism of energy flow in a steel plant and the design principles of energy control center are also discussed in this paper. And then, a series of measures of energy-saving and emission reduction are proposed based on the mechanism of ferrogenious flow and carbon energy flow system. The connotation of “buying coal only, no buying electricity and no fuel” and the “zero emissions” of by-product gases and other energy mediums are especially explained. It is proposed that energy-saving and emission reduction for Chinese steel plants would enter a new stage marked by building energy flow network- Energy Control Center.
2010 Vol. 45 (4): 1-1 [
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原料与炼铁
10
EXPERIMENTAL STUDY ON SINTERING BED HEIGHT IMPROVEMENT AT EAST ANSHAN SINTERING PLANT OF AISC
Under the laboratory conditions, sinter pot tests with bed height enhanced from 600 mm to 700 mm has been carried out to obtain the optimized process parameters to produce sinter with high chemical composition stability，mechanical strength，uniform size distribution and high temperature metallurgical qualities. The hematite concentrate was provided by East Anshan Sintering Plant of AISC as the main raw materials. The relationships between sintering parameters and technical-economic index had been investigated so that theoretical basis to further enhance the sintering bed height could be provided.
2010 Vol. 45 (4): 10-10 [
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2010 Vol. 45 (4): 13-13 [
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16
Cheng-Bo WU
Research on Improving the Property of Anti-pulverization in Low-temperature Reduction of Low Silicon Sinter
To the problem of low intensity and poor property of anti-pulverization in low-temperature reduction process occurred in low silicon sinter, the microstructure of sinter offered by one iron and steel corporation was investigated. The result shows that the content of magnetite and calcium ferrite is low , while that of vitreous silicate with poor intensity and hematite with good reducibility are high. In order to improve the property of anti-pulverization in low-temperature reduction process, the effect of sintering process(fuel matching , the thickness of stuff seam) and the content of sinter(Al2O3/SiO2, basicity and MgO content)were studied. The result shows that the optimum fuel matching and the thickness of stuff seam for the present sinter are 5.0% and 515mm, and the Al2O3/SiO2, basicity and MgO content are 0.31、2.3、2.02%, respectively.
2010 Vol. 45 (4): 16-16 [
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炼钢
20
Zhang Xian-Guang
Simulation on the behavior of Argon Bubbles in Slab Continuous Casting Mold
Aiming at the behavior of Argon Bubbles in Slab continuous casting mold with cast speed 1.7m/min, the influence of blowing argon flow rate on bubble size, bubble distribution, the liquid surface level oscillation and behaviors of slag-melt were investigated by using water model and numerical simulation, the 190 mm×1900 mm slab mold is taken as an object of study. The results show that with increasing gas flow rate in nozzle the size of bubbles in mold increased, the bubble numbers near the narrow face of the mold decreased and most of the bubbles float upward to the surface of the mold in regions around the submerged entry nozzle. The emulsified slag entrapment, metal level bareness and slag entrapment near the nozzle were mainly caused by blowing gas flow rate.
2010 Vol. 45 (4): 20-20 [
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26
Li An-Lin
Research and Application on Bottom Blowing System of top-bottom combined blown converter
First according to the structure of purging plugs, the limit gas flow is obtained through theoretical calculation or practical test,the minimum gas flow is 45Nm3/h and the maximum gas flow is 200Nm3/h.Different bottom blowing patterns suitable for smelting system were established based on different gas supply conditions about two and four purging plugs.Obtain a good result after industrial use,the life of combined blown converters were greatly improved, the life of combined blown can be the same with that of converter, the TFe in the slag is lowered by 3.25%,the [O] in steel is decreased by103PPm, the measured [C]•[O] at the end point of smelting is as high as 0.0026, the yield of alloy is increased significantly.
2010 Vol. 45 (4): 26-26 [
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31
WANG MIN
The Generation Mechanism of Calcium aluminate Inclusion
A part of study on the generation mechanism of calcium aluminate’s inclusions by the means of heterogeneous nucleation theory was done. The calculation results show that when the acid solution aluminum is 0.03 percent and temperature is 1873K, if the Al2O3 inclusion generate in the molten by homogeneous nucleation, the dissolved oxygen must get 32.9x10-6 .Before Al-Killed, the dissolved oxygen is about 0.02%,so the reaction can happen. But after Al-killed ，the dissolved oxygen of getting equilibrium is about 3.3x10-6. It’s difficult to generate the CaO by homogeneous nucleation because of the low dissolved oxygen after Al-Killed. The Calcium aluminates inclusion generate on the surface of Al2O3.The reaction is [Ca]+(x+1/3)Al2O3=(CaO).yAl2O3 and the process is Al2O3CA6CA2CACxAy(liquid). This phenomenon was verified by SEM/EDS image. Keyword: calcium aluminate’s inclusion, generation mechanism, nucleation, heterogeneous
2010 Vol. 45 (4): 31-31 [
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34
Miaoyong ZHU
Modeling on Dendrite Growth for Medium Carbon Steel of Continuous Casting Process
Prediction and control of steel microstructure during continuous casting process is an essential task for steel production. Studies on the micro- structural parameters, which are hardly measured directly during high temperature solidification process, have significance for that purpose. Dendrite growth is an important phenomenon during steel solidification process, which is the main existing style in the inner side of the solidifying steel. In the current paper, a simplified numerical method for the dendrite growth was used to analyze and calculate some micro- structural parameters for both medium carbon steel and AISI304 type stainless steels under different casting conditions. The dendrite tip radius, dendrite growth velocity, dendrite arm spacing, temperature gradient and the dendrite tip temperature in the front of solid and liquid interface were investigated and comparisons of these parameters for the two steel grades were carried out. Parametric studies for these two steel grades were also studied. The comparisons showed that the micro- structural parameter values of stainless steel were all smaller than that of the carbon steel due to its special compositions and solidification mode characteristics.
2010 Vol. 45 (4): 34-34 [
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41
Purification of Molten Steel Produced Large Section Cast Steel Ingot Used by Steel and Iron with Slag
Qualified cast ingot of large transect, produced by steel and iron with slag, can be used to make solid waste are fully utilized. The key issue was to reduce the amount of Non-metallic inclusions in molten steel. It was carried on the experiment and the analysis for the system of the refining slag ingredient、pre-deaeration and blowing the Argon fining craft by adopting EBT+LF+Die Casting craft. The result indicated that applying CaO-Al2O3-SiO2-MgO slag with appropriate alkalinity and dregs quantity to slagging and then pre-deaerating by the alloy of SiAlBaCa(addition:1.2kg/t steel), blowing the Argon in different period of fining craft with different flow and time. After treatment, T[0] content in steel has been reduced below 40ppm, the amount of inclusions in steel, especially large granular inclusions(D≥50~80μm) decreased more than 50%. The steel ingot casting qualified rate from 85.7% enhanced to 100%.
2010 Vol. 45 (4): 41-41 [
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压力加工
46
WANG Fei-Long Wei-ping LI
The simulating analysis of the bending-head of slab for hot rough rolling
By the large finite element simulating software, DEFORM, the bending-head of plate slab for hot rough rolling has been analyzed in multi-technological conditions, the influencing factors and their relations to the bending-head has been expressed, and the regression analysis of calculation results has been carried out. The results show that: when the press-down ratio is smaller, the rolls speed difference has the most strongest contribution to the bending-head of slab, the bending-head increases as the rolls speed difference抯 increasing, and others influence can be removed by adjusting the rolls speed difference; when the reduction ratio in pass is oversize, adjusting the rolls speed difference is invalid and must adjust the reduction in pass to control the slab’s bending-head.
2010 Vol. 45 (4): 46-46 [
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50
Research and Application of Flatness Target Curve Setting Model for Cold Rolling Mill
As the target of flatness control, flatness target curve is an important component of the closed loop feedback flatness control system. In order to improve the flatness of cold rolled strips, a basic flatness target curve was set dependent on the flatness discrimination model in revamp of the 1250 6-H reversing cold mill. For purpose of avoiding influence coming from temperature, coil shape as well as geometric error of winder, series of compensation curves were set in accordance with the rolling process and equipment condition in site. At the same time, additional manual curves were set which brought flexibility to flatness control. The applications show that the model of flatness target curve is capable in flatness control and is significant to obtain good flatness. Strip profile was effectively controlled and was met the need of following processing.
2010 Vol. 45 (4): 50-50 [
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56
SHEN Yan-Zhi
The Study of Torsional Vibration Dynamic Characteristics of The Main Drive System Coupled with Roll Gap
High loads, complicated working conditions, and polytropic rolling state are the main character of Heavy Plate Mill. Dynamic analysis of its working state is not very popular in academic circles, especially consider it coupled with roll gap, so it is necessary to be experimentally measured and analyzed according to the site actual conditions. This paper is based on the field measurement of Heavy Plate Mill. Roll gap coupling feature is analyzed, system dynamics model is established and torsional vibration dynamic characteristics of the main drive system are calculated in the paper which has important reference significance.
2010 Vol. 45 (4): 56-56 [
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Finite Element Simulation of Transverse Compressive Stress Distribution in Strip During Continuous Annealing Process
ABSTRACT：In this paper, strip pass technique on continuous annealing/hot galvanizing line (CAL/CGL) was systemic studied by using the finite element analysis software (ANSYS). In this paper, it put forward the mechanism of transverse compressive stress, dedicated the origin of “centripetal force” and the probability to trigger strip buckling with the variability of correlative roll factors. The results from finite element model revealed the influence of strip tension, roll crown, roll flat part on the transverse compressive stress during the strip conveying. Furthermore, Conclusions obtained from simulations provide academic guidance for roll design and selection in practice, which will have a better control of misguiding and buckling, can solve practical problems in production.
2010 Vol. 45 (4): 60-60 [
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钢铁材料
65
Effect of Rare Earth Y on Microstructure and Corrosion Property of 0Cr13 Stainless Steel
Abstract: In order to study the effect of rare earth Y on microstructure and corrosion property of 0Cr13 stainless steel, the rare earth Y was put into the 0Cr13 stainless steel, the effect of rare earth Y on microstructure and corrosion property of 0Cr13 stainless steel was researched by means of observing metallographic microstructure, analyzing components of inclusion, soaking periodically, measuring natural corrosion electrical potential, measuring natural corrosion alternating current impedance. The results shows that the microstructure of 0Cr13 stainless steel is refined and homogenized, rare earth compound forms, and the inclusion hazards of S、O is reduced by the addition of rare earth Y. Rare earth Y can increase effectively the corrosion resistance of 0Cr13 stainless steel.
2010 Vol. 45 (4): 65-65 [
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68
Zhang Ji-Ming Wei-Hua Sun Jun-Liang Liu
STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF Fe-Mn-Si-Al STEELS
The tensile properties of three steels (Fe-30Mn-3Si-3Al, Fe-15Mn-2Si-2Al and Fe-15Mn) show that yield strength and fracture strength increase, and expansion ratio of elongation percentage elongation strain decreases with the decrease of Mn, Si and Al contents. Frequency of Coincidence site lattice grain boundary (CSL) is 83.4%, 36% and 21% for three steels, respectively. Deformation twinning is comprised of a primary twins and secondary twins. A angle between the primary twins and secondary twins is about 60 degree. Most of secondary twins grows in the primary twins. But, some of secondary twins traverse the primary twins boundaries in the heavy deformation band.
2010 Vol. 45 (4): 68-68 [
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72
Austenite Grain Growth Behavior in Nb-Ti Microalloyed Steel
Nb and Ti are the most common microalloying elements in pipeline steel. The effects of the microalloying elements Nb and Ti in Nb-Ti microalloyed steel and the reheating schedule on the austenite grain growth were investigated using heat treatment and vacuum carburizing treatment. The results showed that during reheating process, the austenite grain size in tested steel increased with an increase in the reheating temperature. In normal niobium-containing steel, titanium content should be controlled in a certain range (approximately 0.010%~0.015%), to obtain small reheated austenite grain. Moreover, with the same titanium content, the austenite grain in a steel with high niobium content grows obviously, and the steel with high niobium content has a different optimum titanium content range from that of the steel with normal titanium content.
2010 Vol. 45 (4): 72-72 [
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陈其安 Chen Qi`an
The Characteristics of Pearlite Structure after Deformation of Austenite in Steel 35
The pearlite evolution of undercooled austenite (Ae1) of steel 35 after different deformation and the subsequently varied cooling has been investigated by means of hot compression simulation experiment. It shows that transitional areas with rich carbon are observed at the interface between the ferrite and martensite under the condition of water quenching after deformation. The tiny pearlite forms after heavy deformation (0.92) and lower temperature (690℃). After deformation and slow cooling, the smaller pearlite block can be found with the decreasing deformation temperature and the increasing strain. The lamellar cementite in the pearlite broke up and a large number of granular cementite precipitate on the ferrite boundaries.
2010 Vol. 45 (4): 76-76 [
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80
YU Ran MA Dang-shen CHEN Zai-zhi WU Xing-hui YONG Qi-long Jinzhong Xiang
Effect of Annealing Treatment on Microstructure and Properties of A6 Steel
The effect of different annealing processes on microstructure and properties of A6 steel was studied, and two optimal spheroidizing annealing processes were selected. The result shows that compared with the traditional annealing process, the optimal spheroidizing annealing processes effectively improve the spheroidized microstructure and reduce the annealing hardness, and also the annealing plasticity and toughness of A6 steel have exponentially increased. In addition, after the quenched-tempered treatment,the plasticity and toughness of A6 steel are improved greatly.
2010 Vol. 45 (4): 80-80 [
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环保与能源
83
Xu Ai-ju Zhang Yu Gao Jun Zhaorigetu Bao Lin Qin
Catalytic Performance of Oxidative Dehydrogenation of Propane to Propene with the MnO / Blast Furnace Slag Catalyst
A series catalyst of the MnO / Pangang Blast Furnace Slag supported was prepared by solid state grinding method and characterized with X-ray diffraction (XRD) and H2-TPR. Their catalytic behaviors for the oxidative dehydrogenation (ODH) of propane to propene were also investigated. The results showed that they had a better catalytic activity for ODH of propane when the mnganese oxide loading was 20% and 17.84% conversion of propane and 63.75% selectivity of propene were reached with the catalyst at 500℃. The study provided a new way in comprehensive utilization of resources and reducing environmental pollution.
2010 Vol. 45 (4): 83-83 [
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86
Optimal Utilization and Circular Economy of Coke Oven Gas and Purge Gas
Preparation plant of methanol by coke oven and application of purge gas in optimizing cascaded control respectively developed by chemical engineering secondary design institute and TengZhou ShengLong coking company. After it was put into operation high quality methanol was obtained ,and obvious energy saving 、environmental protection and economic benefit could be achieved.
2010 Vol. 45 (4): 86-86 [
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装备与控制
89
WANG YingQun
Preliminary Study on Layout of Reladling Station and Related Issue
Reladling station is one of the most important interface technology of BF-BOF sections. As the essential character, layout style of reladling station is always the key point in engineering. The layout includes two main patterns, which are parallel/landscape orientation layout and vertical/longitudinal layout. Final layout selection is related to a lots of factors. From the point of interface technology, technical character, hot metal turnover time, hot metal accepting capacity, occupancy factor of crane and number of reladling pits have been studied. From the point of engineering technology, steel structure and concrete structure and project investment of the two patterns have been discussed. The author proposes to provide theory evidence to the style selection of reladling station and scientific method to analyse production run of reladling station.
2010 Vol. 45 (4): 89-89 [
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技术交流
94
The technology modification regarding the research of the quality of Ti bearing ferritic stainless steel slab
The slab quality of Ti bearing ferritic stainless steel got the negative effect because of the adding of Ti. Thus, the research carried out by steelmaking plant of stainless steel unit, to give the evaluation of slab quality, and direct the technology modification.
2010 Vol. 45 (4): 94-94 [
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98
The analysis of destruction of No. 1 BF cooling staves for Ningbo iron and steel corp. LTD.
According to the earlier destruction of No. 4 segment of cooling staves for No. 1 Blast furnace in Ningbo iron and steel corp. LTD., combination with the similar situations of related enterprises at home, analyzing the causes and providing suggestions for prevention of improving .
2010 Vol. 45 (4): 98-98 [
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