Abstract: High purity of liquid steel and controlled shape of inclusions were demanded for high strength and low temperature impact ductility of advanced ship plate. The smelting process, purity, and inclusion shape of high-level ship plate of some domestic factories were studied in this paper. The results indicated that the purity of the ship plate steel by the process was high. Inclusions in the casting blanks were mainly globular, whose com-ponent was CaO-CaS-Al2O3 and the sizes were less than 10 μm. High-level ship plate with ultra-low oxygen, ul-tra-low sulfur and high purity can be produced by the process of BOF-LF/VD-CC under proper operating condi-tions.
Abstract: Liquid steel for continuous casting was refined quickly at the alloy conditioning station in Masteel with the mixture of CaO-SiO2-CaC2 to slag and Al, SiCa to deoxidize in the period of 18 min (converter match to cast). The activity of oxygen in liquid steel can be decreased less than 20×10-6 and FeO+MnO<3% in the final slag, which meets the needs of shaped block cast machine that lubricates with oil.
Abstract: The cleanliness of X70 pipeline steel in the production process was investigated and assessed. In the meantime, the primary study and discussion of choosing and controlling the reasonable cleanliness for high-grade pipeline steel in its production were carried out too. The results show that the linear relationship be-tween the increased steel quality and its improved cleanliness does not exist. The steel cleanliness should not beexcessively pursued. It is more beneficial for reducing production cost and enhancing steel quality when the dis-tribution of inclusions is uniform, fine and dispersing when the reasonable steel cleanliness is attained.
Abstract: Ladle furnace (LF) refining slag plays an important role in desulfurizing and inclusion removal from steel. According to the high[O] content and low[C] in the initial liquid steel from BOF (basic oxygen fur-nace) furnace, the CaO-Al2O3 slag system was suggested to use in the LF refining of low carbon aluminum con-taining steel. To enhance the desulfurizing and inclusion absorption for the liquid steel, the compositions of the final refining slag in LF can be chosen as:CaO=55%-60%, SiO2=4%-7%, Al2O3=28%-32%, MgO=4%-8% (mass fraction), and CaO/Al2O3=1.7-1.9. During the tapping, most of the refining slag was added into the ladle to real-ize slag filtration. The oxidizing slag tapped into the ladle from BOF was reduced in the end of tapping. And enough time was kept to killing the liquid steel with Ar soft blowing. By all of above methods, the steel grade of 16MnR was refined with a better result as:the desulfurizing ratio was 61.8%, the total oxygen content T[O] in slab decreased to 22×10-6, and the macro inclusions (≥ 50 μm) in slab also dropped down to 15.68 mg/10 kg steel.
Abstract: Based on analysis of the inclusion restriction in ML08Al steel, the component range of final refining slag was designed and the slag forming system was determined. The productive practice shows that the slag melting condition of refining slag is better and the desulphurizing ratio is relatively high, which can satisfy the requirements of steel grade. The research on cleanliness of billet continuous casting shows that, under the current condition, the T[O] content is less than 20×10-6, the inclusion amount of electrolytic is less than 10 mg/10 kg steel. The thermodynamics of Ca treatment was also discussed.
Abstract: The process of Mg-cored wire feeding was investigated. The Mg cored wire with special structure was applied in inclusion modification in steel. The process of feeding the Mg-cored wire is more smoothly than feeding the Mg-wire with old structure in steel treating at 1600℃, the absorption ratio is higher and more stable than that of the old process. After being treated by Mg-cored wire feeding, the Al2O3 inclusions with the big size changes to the fine particles of MgO·Al2O3 inclusions. At same time, the Al2O3·MnS inclusions changes to the Al2O3·MgS·MnS inclusions.
Abstract: The effect of total oxygen content and nitrogen content on the quality of H type steel and the type and morphology of macroinclusions and microinclusions in steel were analyzed concerning the change of total oxygen content and nitrogen content during H type steel manufacturing in Jinxi Steel. Volume rate method was applied to calculate the distribution of various inclusions in steel. Inadequate primary deoxidization in liquid steel and high total oxygen in steel account for excessive inclusions. The undulation of inclusion quantity ac-counts for the formation of cracks. From tundish to billet, the elimination rate of inclusions is about 40%. The origin of most inclusions is not unitary. The granule diameter of micro inclusions in billet is small. Inclusions of 0~10 μm account for over 64%, while inclusions of over 20 μm do about 20%.
Abstract: The comparison of different RH processes was presented including the process condition and metallurgical effect. The characteristic of two different RH-processes was analyzed and how to control the bale-ful element and inclusions in pipeline steel were discussed. The T[O] of LF-RH and RH-LF are 14×10-6 and 19×10-6. The micro-inclusion numbers of LF-RH and RH-LF are 2.48/mm2 and 2.62/mm2. The[N] of LF-RH and RH-LF are 53×10-6 and 38×10-6. From these practices, the experience for producing high quality oil-pipe steel in the future was accumulated.
Abstract: The activities of sulfur and oxygen reacted with aluminum in hot metal were calculated by the thermodynamics data. The capability of desulphurization for hot metal could be increased as aluminum and lime were added into hot metal together. In this case, the thermodynamics reaction mechanism of desulphurization and the effect of Al2O3 and CaF2 in desulphurization in hot metal were discussed.
Abstract: The admixture of CaO and Mg was used to treat the hot metal for desulphurizing in Chongqing Steel Corporation. The fluidity of the desulfurizd slag is not of benefit to separating the molten slag from hot metal. Usually, the way to resolve the problem is modifying the desulfurizd slag with using the modifying agent. The compositions of the modifying agent were optimized through experiment analysis. It is found that the melting point of the modifying agent is 930℃, and the viscosity is 0.627 Pa·s at 1250℃, the melting point of the modified desulfurization slag is from 1350 to 1370℃, and the viscosity is less than 1 Pa·s. The primary plant trial showed that the modifying agent could properly solve the problem of separating slag from hot metal.
Abstract: The technology of separately spraying magnesium powder to desulphurize molten iron that can improve the conditions of the original smelting material in rolling furnaces is introduced, and the desulfurization mechanism is briefly described. The sulfur content of the hot metal after pre-desulfurization with the new devel-oped passivated magnesium powder decreased to lower than 0.010% (mass fraction), and the lowest sulfur con-tent is 0.003%. It meet the requirement of hot metal.
Abstract: In steel making for tyre cord, weak deoxidation, prevention of reoxidation, and control of ba-sicity and Al2O3 content in refining slag were adopted to decrease the melting point of inclusions in liquid steel and promote floating upward of inclusions. It was proved that the composition, size and deformation ability of inclusions in tyre cord were promoted by the application of the abovementioned technologies.
Abstract: According to Tianjin Pipe practice of charging hot metal to a modern electric arc furnace, it was known that the hot metal charging technology could increase the economic benefit and expand the EAF steel grads. Compared the traditional arc furnace with the oxygen converter, the depth of the pool of a modern EAF should be between the EAF's and the basic oxygen converter's. Compared the changes of the cost with the profit and the negative influence of charging hot metal, the proportion of the charging hot metal was determined. The best place to charge hot metal into a modern EAF was the back of the opening acidic. The temperature of the hot metal should be higher than 1200℃. Silicon in hot metal should be lower than 1.0% (mass fraction), and the best should be lower than 0.5%.
Abstract: Based on the analysis of electrical characteristics of the electric arc furnace, theoretical electrical characteristic curves of electric arc furnace were drawn. With the concept of "conomy electric current", the rea-sonable power input specification under the consideration of many relative factors was given. According to the productive process of Chinese steelmaking manufacture of electric arc furnace, the principle of secondary voltage determination and the means of device loop impedance worth ascertain was introduced. Combing the high impedance electric arc furnace technology, the power input specification of high voltage and long arc was put forward, and reasonable guarantee of power input specification wasproposed.
Abstract: The data of energy and energy consumed materials on the procedures of sintering, iron-making in BF, steel-making and steel-rolling in Xingcheng Special Steel were collected, dealt with and analyzed. The en-ergy consumption and the electric power consumption per ton of products every procedure were calculated and converted into per ton of steel in the whole process. It showed that the yield of Xingcheng Special Steel increased from 791.8 thousand tons in 2002 to 916 million tons in 2004, which increased 15.69%. And the electric power consumption of EAF decreased from 340.20 to 166.30 kW·h·t-1, which is 51.12% less. And the energy consump-tion per ton of steel in the whole process increased from 289.51 to 615.44 kgce·t-1, which is 112.58% more.
Abstract: The application condition of TPC (Terminal Process Control) technology in the operation of 50 t EAF were introduced. Through adoption of TPC problems such as steel sticking with water cooled furnace cover were solved, and the hit ratio of predicting both of terminal composition and temperature of the steel increased from 67% to 91%. Additionally, several indicators were greatly improved, for example, the time of electricity supply was shortened by 6 min/furnace, electric consumption was reduced by 58 kW·h·t-1, and electrode con-sumption was reduced by 0.30 kW·h·t-1.
Abstract: For the purpose of slowing down the LF stove the work pressure by improving the craft of slag washing of converter, slag washing of converter in a systematic theory and the experiment of industry was ex-plained. In the industry experiment, the production craft of the iron melt desulphurization-converter smelting steel tapping slag washing-argon station processing-pouring continuous caster was used. The deoxidizer in the converter tapping process was thrown to carry on slag formation of slag charge, through blowing the argon agitation for the tapping process creation good reaction kinetics condition for the deoxidization, the desulphuri-zation, the oxygen content control in 2×10-5. The process desulfurization percentage was achieved 45%~65%. Moreover, because this craft process time was short, it was lower that compared phosphorus kick-back quantity with the ordinary LF craft. As a result the slag heat preservation function, the middle package temperature was dropped suitable degree to achieve with the LF temperature.
Abstract: The key technology about the design of 90 t Ultra High Frequency Arc Furnace's dedusting sys-tem, technical flow, and automation control was introduced. And the material of dedusting filter bag, cleaning dust technics and the temperature of the gas were analyzed. The dedusting system of the 90 t UHP arc furnace in Hengyang Steel-making Co. was run into use for six months. It worked well and stable. When the arc furnace worked normally, it could work automatically. It was more advantage than the first steel making factory. In fact, because of the use of the dedusting system, it improved the pollution to the environment and improved the pro-ductivity, so good economy and social benefit were got.
Abstract: This task was got across the physical chemistry analyse and the hot-form experiment,researching adopt the gas-liquid multiphase balanceable energetics and dynamics by using CO2 and O2 mixed-blowing,and the decarbonization disciplinarian inside the metal melt in the blowing process.The composition and temperature diversification disciplinarian of iron and gas in the process of smelt was proved up.Approving the feasibility of the mixing blowing by using CO2 and O2 in the technics of steel-making,the theory gist of CO2-O2 mixing blowing technics of steelmaking was offered.According to the heat balance calculation and preliminary experi-ment,the carbon was taken off achieving the destination of metallurgy by jetting CO2 with certain density during steel making.It was completely possible to jet certain CO2 in blowing steel making due to the supply of energy and application of post combustion in EAF steel making.
Abstract: Software CFX 10.0 was used to simulate the characteristic of coherent jet oxygen lance and common oxygen lance.The advantage of coherent jet oxygen lance was proved by comparing the characteristic of the two lances.The coherent jet oxygen lance was used in the 100 t shaft EAF in Anyang Iron and Steel Co.Ltd.and the effect was analyzed.The results show that the electric consumption decreases by 30 kW·h and the advantage in oxygen consumption and production cost is obvious.Combustion cycle increases with the increase of hot metals proportion.The suggested hot metal ratio keeps about 50% because electric consumption,oxygen consumption,combustion cycle and production cost keep the similar level as hot metal ratio around 50%.
Abstract: The component fluctuation of 20CrMnTiH steel in Laiwu Special Steel Plant was large,the-hardenability bands belt was HRC 8-10,this constrained the further improvement of gear steel quality.Based on the research,it was found that center segregation especially carbon segregation in blooms was the major prob-lem.By taking measures,especially the increase of electromagnetic stirring,the center carbon segregation was markedly improved;C control between 0.19%~0.22% reached 95.6%;hardenability bands belt control in HRC 6 reached 92.1% and in HRC 4 reached 86.2%.The quality of products is improved and the needs of users are met.
Abstract: The high-pressure boiler steel 12Cr1MoVG was produced in steelmaking plant,TPCO,by using foaming slag submerged arc operation in the whole period of EAF steelmaking,EBT tapping alloying,LF compound refining slag,Ca-Si wire feeding after VD treatment and casting with shielding practice.The quantity and changes of total oxygen,microinclusions and macroinclusions in the liquid steel in different steps were stud-ied by the way of sampling systematically,tracers and comprehensive analyses.The results show that the T[O] is 15×10-6 after LF/VD refining and 17×10-6 in tundish,and the T[O] of cast billets was 18×10-6~24×10-6.The number of microinclusions was 3.53 mm-2 with sizes less than 10 μm,which were mainly spherical calcium alu-minate,aluminosilicate and compound inclusions of aluminate and sulphide.The macroinclusions were mainly ferrum-aluminum silicate,magnesium-calcium silicate,etc.The macrostructure is uniform and the surface quality is good.Each technical index meets the requirement of GB5310 standard.
Abstract: In view of the steel tube produced by "EAF-LF-VD-HCC" horizontal continuous casting process, micro and large inclusions in the steel before and after LF, after VD, in tundish and casting blank were studied by using optical microscope, scanning electron microscope, EDAX energy dispersive spectroscopy, electron microprobe, electrolysis, tracer tracking and other analytical tools and methods. The results show that the relative numbers of tube steel micro-inclusions and macro-inclusions are 16.1 mm-2, and 214.6 mg·kg-1, respectively.
Abstract: Using systematic sampling and comprehensive analysis, the variation of total oxygen content and amount, dimension and distribution of nonmetallic inclusions were studied systematically during the production process of hot metal pretreatment-LD-LF-VD-slab CC in Angang. The results show that:(1) The average total oxygen content of slab is 17.33×10-6 and the number of micro inclusions is 2.40 mm-2; (2) Before and after the LF process, micro nonmetallic inclusions in the steel are mainly strip or block Al2O3 and global or polyhedral silicate;after calcium treatment in VD, the pure brittle Al2O3 inclusions and harmful MnS inclusions along boundaries were not found; (3) The reappearance of Al2O3 inclusions in mold and slab indicates that secondary oxidation happens in the tundish or mold; (4) Oxide and sulfide inclusions are not modified fully.
Abstract: Based on the similar principle, water modeling experiment was carried out for the 150 t ladle furnace at Tianjin Pipe Corporation Ltd. (the geometry ratio is 1:4 between the model and prototype). It was found that the holes' positions weren't rational completely, porous brick was small, and gas flow rate was a little large. The rational argon blowing process is determined by optimizing experiments:the holes are moved to the position of 1/3R, the top diameter of porous brick is increased to 35 mm from 16 mm, and the gas flux is con-trolled to 0.44m3·h-1. The results provide references for the improvement of actual ladle.
Abstract: In view of the disadvantage of mechanical properties decrease and high cost of truck front axle caused by using quenched and tempered steel, a non-quenched and tempered steel trucks front axle was designed by using of cheap substitute, such as Mn, Si alloy elements instead of Cr, Ni, Mo and other more expensive al-loying elements. The air-cooled bainitic steel components were designed as Mn-Si-V-B steel and the No. was 18Mn2SiVB. Through smelting operations, heat treatment of front axle was determined by test and industrial ex-periment was carried out. The product was tested by phase fatigue analysis and experimental. The results show that the basic conditions of smelting and casting and rolling can meet the designed requirements of 18Mn2SiVB steel production. 18Mn2SiVB instead of 45# steel, 40CrMo or 40CrNiMo to manufacture trucks front axle can satisfy the use requirements from the mechanical test results; in the manufacturing process, using air cooling in-stead of quenched and tempered after forging is feasible.
Abstract: The middle and small electric machine rotors were studied in the condition of traditional steel-making technique in Chengdu Steel Corporation, which had no refining and electromagnetic stirring equipments. Following the reasonable technique of steelmaking, continuous casting and hot rolling, as well as the strict control of the parameters of every procedure, the low silicon content cold-rolled hot strip of the dynamo steel was produced and reached the related national standard. The results show that the product of the dynamo steel reaches the international standard of 50W1300. There are no interior and exterior defects on the billet steel and the cold-rolled and hot-rolled strips are better on the surface, which is fit for the producing of small electric machine rotors.
Abstract: According to the difficulties of the 65# steel-making, the BOF-LF-CC technology was used to produce the 65# high carbon steel. Some measures were taken in the following processes:controlling the raw materials and the charging system, using the MURC multi-functional combined blow, and holding slag in tapping process in BOF session; choosing the appropriate slag system to improve desulphurization, controlling the Al contain and stabilizing the component of hot steel and the temperature in LF refining; choosing the appropriate casting temperature, improving the second cooling, protecting the casting completely, and using the electromag-netic stirring in mold in the casting process. The results show that the low magnification microscopic structure in billet is fine and the carbon segregation exponent is below 1.1, which meets the demand of the steel series. Based on the sampling and analysis of the product quality, the test results meet the requirements of the relevant product standards and reach the advanced level of similar products in China.
Abstract: According to the test of the high temperature ductile plastic property and the surface temperature of continuous casting billets, when it contains Nb, V, Ti among 700-900℃ in the third brittleness temperature province, contraction of cross sectional area, the rate RA value is lower, about 36%. If the RA value is more than 40%, the ductile plastic property temperature is about 950℃. Even adopting weak colding, the temperature of casting billet side cape also can't attain enough. Through the measurement, it can give the very big help towards drawing up the craft measure, improving the thermal plasticity of straightening areas and reducing cracks of the casting billet side cape. Combining with the production process and the actual conditions of the continuous caster in our plant, practical discussion and proposals have been made for the preventative measures of eliminating sur-face cracking.
Abstract: Based on the improved ladle argon blowing in Xinyu Steel Plant, the average removal rate of macro-inclusions in steel can be reached 34.3% with electrolyzing analysis; especially, the macro-inclusions with a diameter above 300 μm can be completely wiped off. The types of inclusions are mainly silicate and sulfide in the samples determined by SEM analysis. Microscope statistics analysis shows that the amount of mi-cro-inclusions in each diameter range has been decreased. The analyzing result also shows that the inclusion re-moval rate in the improved ladle argon blowing process is obviously increased. The argon blowing process di-rectly determines the removal rate of macro-inclusions and micro-inclusions.
Abstract: The technique of producing Cr12 high alloy die steel by the traditional recirculating metal oxygen lancing process was introduced. By analyzing the merits and the disadvantage of the traditional process and the smelting characteristics of the "EBT + LF" two-step process, the feasibility of producing Cr12 die steel by the new oxidizing process was defined. By reasonable arranging EAF production and summing-up the various pro-duction requirements, the existing difficulties of the new technology were gradually resolved. The results of product quality testing show that by using the oxidizing process, the components of Cr12 die steel are stable and the end-point hit rate is high, which is conducive to maintaining the stability of product quality. Compared with the traditional process, the oxidation smelting of Cr12 die steel brings obvious economic benefits, and the total efficiency reaches 787 RMB/t.
Abstract: The feasibility of desulfurization by particle magnesium in hot metal pretreatment was expoundedthrough calculation in thermodynamics and dynamics. Based on 77 group data of desulfurization process in thdesulfurization station of Xuanhua Iron and Steel Group Co. Ltd., a mathematics model about desulfurization ratand magnesium utilization rate was obtained. The above model is in favor of the optimization of process iXuanhua Steel Plant and it increases the utilization rate of particle magnesium, decreases the consumption of particle magnesium, and saves the cost. To improve the desulfurization ratio of desulfurizer and utilization ratio, thtemperature of hot metal and the mass of particle magnesium should be improved, and the injection speed odesulfurizer and the blowing time should be declined.
Abstract: By the means of numerical model, the optimization of the geometrical parameters of slab continuous casting tundish configuration of the No. 3 Steel Plant in Taiyuan Iron and Steel Group were simulated. There are three evaluating indicators on time, one of which is the average time of stay of molten steel in the tundish. These indicators can be got by the impulse response experiment of the virtual tracer. The design of the total factor (four factors and tow levels) experiment is based on L16(215) orthogonal list. And the results ascertain the significant influencing factors by variance analysis and F test. The best working condition due to the three evaluating indicators is:the distance of retaining wall to the center line of water gap is 500 mm, the bottom of retaining wall to the bottom of tundish 200 mm, the center line of retaining wall to the center line of dam 322 mm, and the height of the dam 272 mm. It means that the flow behavior in the existed tundish is normal. But it will be better under the optimized condition. The disabled zone will be reduced from 4.80% to 4.37%. The disabled zone will be decreased by 2.53% if the turbulence inhibitor is used.
Abstract: Based on the tundish in Xingcheng Special Steel, according to the similar principle, the water modeling system of the four-strand caster tundish was built. The simulating study shows that a large difference in flow characteristics exits between the two outlets at the same side of the tunish comparing with those of the former configuration. Compared to the inside outlet, the outside outlet has short minimum residence time and peak concentration time and larger dead zone volume. So the original design of the tundish can not meet the technical requirements for inclusion floatation and temperature homogenization. With the optimal tunish configuration by using dam and weir, the RTD curves of two outlets at the same side tend to be the same, showing that the flow characteristics between the two outlets are almost uniform. With the optimal tunish configuration, the average percentage of dead zone volume is decreased to 10.9% from 58.2%.
Abstract: The application of mold electromagnetic stirring in continuous casting of middle billet in the Steel Work of Sanming Iron & Steel in Fujian Province was introduced. The optimization of the operation pa-rameters of M-EMS has achieved good metallurgical results, such as decreasing the carbon segregation and pre-venting the central porosity. Those measurements are very useful in improving the quality of products. It is pro-posed that final electromagnetic stirring should be used in the end of liquid core.
Abstract: The history data produced by steel-making were analyzed and then were processed to classify them according to the differences of hot metal, cost, oxygen consumption and yield. It provides practical infor-mation for the operator. For different sorts, several groups of oxygen injection and active power curves were found representing the corresponding sort and its optimization oxygen injection and active power curve were obtained after processing the curves together.
Abstract: Molten Sn-15%Pb alloy, which was used as the test material, was treated with electric pulse for different treating time under the condition of 90℃ overheating. The modifying effects on solidification process and structures were investigated by thermal analysis and solidification structure observation. The results showed that the solidification structures of Sn-15%Pb alloy were changed significantly after electric pulse modifying. The morphology of primary crystal enriched Sn changed from dendrite to cellular. Corresponding with the changing of solidification structures, the cooling curves were changed significantly. The lowest temperature of primary crystallizing increased in a rather large range. With the increasing of electric pulse process time, the amount of cellular primary crystal changed periodically, that is little, large, little, large. At the same time, the lowest temperature of primary crystallizing also changed periodically with the extension of electric pulse treating time.
Abstract: The limestone decomposed to activity lime by TG at the rates of 10, 15, 20, 25 and 30℃/min was studied. The decomposing mechanism equation is F(α)=(1-α)-1, and the reaction rate constant is $k=54325{{\rm{e}}^{-\frac{{98873}}{{RT}}}}$. It is founded that the diffused constant in the decomposition of lime from limestone is $\lg D=-\frac{{2506}}{T}+2.28$, a dynamics model of decomposing time of limestone with the decomposition ratio XB was revised, and the finished time of limestone decomposition at 1423 K was forecasted with this model. It indicates that the forecasted results agree very well with the experiment results.
Abstract: Roasting reduction of the laterite lean iron ore was tested in reduction atmosphere. The optimal pa-rameters of roasting reduction in reduction atmosphere with a metallization rate up to more than 80% were determined by orthogonal method. The roasting temperature is 1350℃, the roasting time is 25 min and C/O is 0.8. Under the condition of higher temperature or longer roasting time, a separation phenomenon of slag and iron was found. In order to accord with the practical condition, the experiment was carried out in oxidation atmosphere. Because of the oxidation layer in the surface of the pellet, the metallization rate declined to nearly 50%, and it's good for increasing the metalli-zation rate by reducing the oxidation layer. At the same time, the feasibility of roasting reduction in oxidation atmos-phere was approved by the experiment.
Abstract: The compact BF-BOF interface mode which is "BF-the hot metal bottle-BOF" (direct charg-ing from the hot metal bottle into the converter) was put forward by analyzing the actuality of supplying hot metal in the steelworks. Its advantages were evaluated and analyzed on from time, the quality of hot metal, en-ergy resource and environmental protection, equipments and staff. The result showed that the exiting hot metal bottles must be changed, and two methods of the capacity-expansion of hot metal ladles were produced in light of the request of hot metal direct charging, and two methods' effects were compared. Finally, the change of correla-tive establishment was also discussed, and some reason were preposed for rebuilding the supplier methods in the steelworks.
Abstract: The functional frame of MES and its role in storage management in steel enterprise were de-scribed. The leak of technology management was pointed out, and then a resolving method was discussed and a storage management system was developed by using Delphi 7.0 and Microsoft SQL Server 2000. Meanwhile, the direction of storage optimization was put forward, and it is helpful for enterprise informationization.
Abstract: The development of the rotary hearth furnace (RHF) ironmaking process at home and abroad was introduced. Emphasis was paid on elucidating the achievement and experience on the course of the research on RHF technology by University of Science and Technology Beijing. Based on chinese conditions and policies, the combined process of RHF pre-reduction and melting-gasifying furnace should be considered as the orienta-tion to develop RHF technology, which should be mainly applied to supplying hot metal to EAF, recovery of dust from these iron and steel plants, and comprehensive utilization of special ores etc.
Monthly, started in 1955 Supervising institution：Ministry of Education Sponsoring Institution：University of Science and Technology Beijing Editorial office：Editorial Department of Chinese Journal of Engineering Publisher：Science Press Chairperson：Ren-shu Yang Editor-in-Chief：Ai-xiang Wu ISSN 2095-9389CN 2095-9389
