Volumn Content

Steelmaking 2011 Vol.27 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Discussion on high efficient and low cost clean steel production platform:One of the key technologies for steel industry in 21st century Steelmaking    2011, 27 (1): 1-10.   Abstract （618）            Knowledge map    Save The high efficient and low cost clean steel production platform is a key technology for steel industry ,which basicly and largely affects on the efficiency,quality and cost of the steel production and it will final determine the marketing competitiveness enhancing of steel companies.The clean steel platform is the integration of pretreatment technology of hot metal, BOF technology,secondary metallurgy technology,100% continuous casting optimizedsimplified process network technology and dynamicorderly operating material flow technology.It emphasized that at present, the high efficient and low cost clean steels platform should foucs on following aspects: thoroughly understand that coordinationsteady is the core of the clean steel production platform；high efficient and constant continuous casting speed technology is the source for the clean steel production platform operating dynamically and orderly, and is also the key for highquality, engery saving and low cost. Related Articles | Metrics Select Progress of production technology for clean steel at Baosteel Steelmaking    2011, 27 (1): 11-14,1.   Abstract （635）            Knowledge map    Save The main equipments of steelmaking plant of Baosteel are briefly introduced in this paper. The progress in control technology of phosphorus, sulphur, total oxygen, nitrogen, carbon in steel is discussed at Baosteel. The control level of residual elements in heavy plate is introduced too. Related Articles | Metrics Cited: Baidu(2) Select Practice of steelmaking production economically Steelmaking    2011, 27 (1): 15-17.   Abstract （1530）            Knowledge map    Save In order to quicken steelmaking production rhythm and reduce energy consumption and material consumption of steelmaking process the producing feasibility of 5 converters in the Steelmaking Plant of Baosteel has been analyzed and different production schemes compared and the countermeasures for special steel production put forward as well. Since adoption of 5 converters production electric power consumption has been saved by over 100 000 kWh every day, average time of converter tap to tap reduced by 17 minutes, transferring and buffering time of converter decreased by 3 minutes and steelmaking production economically realized. Related Articles | Metrics Select Process practice of steelmaking with 100% hot metal in 160 t EAF Steelmaking    2011, 27 (1): 18-20,6.   Abstract （1379）            Knowledge map    Save The present article introduces technological process for manufacturing the dephosphorized hot metal at the 160 t EAF in the 1.5 million t stainless steel production line in Taigang using 100% hot metal as the raw material and by brief analysis on the quality, cost and production it's believed that the demand of refining in the stainless steel production line can be met by adoption of a 160 t EAF using 100% hot metal as the raw material. The process is an inseparated part of entire operating process of the 1.5 million t stainless steel production line in Taiyuan Stainless Steel Co., Ltd. Related Articles | Metrics Select Practice of sulfur content control in smelting extralow sulfur pipe line steel Steelmaking    2011, 27 (1): 21-23.   Abstract （623）            Knowledge map    Save Based on the testing practice of extralow pipe line steel in tanggang, the present paper introduces the technology of sulfur control in the overall process, points out that the key control points for refining the extralow steel are hot metal pretreatment and LF refining，and key to HIC resistance is to control inclusions in steel. It's concluded that by controlling the sulphur content in the entire process the extralow sulphur pipe line steel can be produced. Related Articles | Metrics Select Production practice of improving billet CC availability Steelmaking    2011, 27 (1): 24-27.   Abstract （610）            Knowledge map    Save By way of adoption of a series technical measures such as analyzing factors affecting the operating rate of the billet continuous caster, drawing up the stoppernozzle assembling principle, optimizing the physical and chemical indexes of various fluxes and the current intensity of the electromagnetic stirring, stabilizing the superheat degree, reducing break accidents caused by stopper malfunction and steel overflowleakage, the actual operating rate of CCM is increased. Related Articles | Metrics Cited: Baidu(1) Select Analysis and control on corner cracks of 45 steel in continuous casting of rectangular bloom Steelmaking    2011, 27 (1): 28-30,7.   Abstract （608）            Knowledge map    Save In this paper the formation mechanism and influence factors of corner cracks of 45 steel in continuous casting of rectangular bloom were analyzed. The results show that inhomogeneous heat transfer in mould is the primary cause to formation of the corner cracks and appropriate mould taper is the key factor to avoid corner cracks. Measures to reduce corner cracks such as improving quality of molten steel, strengthening technological control and optimizing mould taper are proposed. The production practice indicates that occurring rate of corner cracks is decreased from 89.73% to 18.05%, and cracks(≥1.0) are eliminated basically. Related Articles | Metrics Select Water modeling on the configuration of turbulence inhibitor in tundish Steelmaking    2011, 27 (1): 31-35.   Abstract （623）            Knowledge map    Save The influence of the configuration of turbulence inhibitor on the characteristics of fluid flow in a tundish is studied through water modeling experiments. The results show that the fluid flow behavior in the tundish is greatly affected by the configuration of turbulence inhibitor. Turbulence inhibitor with grooved shape inside, 30 mm in length of its extending lip at the top of the sidewall and flat bottom inside has the best flow field in the tundish. It is propitious to prolong minimum breakthrough time and average residence time, decrease its dead volume fraction and increase the ratio of the plug volume fraction to dead volume fraction. Also, it is the most favorable to remove inclusions in the tundish. Besides, the length of its extending lip at the top of the sidewall influences on the flow field much higher than its inside shape and bottom shape. Related Articles | Metrics Cited: Baidu(1) Select Effect of different combinations of weirs and dams on flow field in two strand tundish Steelmaking    2011, 27 (1): 36-40.   Abstract （1319）            Knowledge map    Save Based on the similarity theory the flow field in twostrand slab continuous casting tundish with three different combinations of weirs and dams has been studied by water modelling experiments. The results show that in case 1 the distance between weir and dam ( “weirdamend dam” plan) is undesirable because the end dam can not effectively control the flow field in tundish, and consequently the mean residence time and the minimum residence time of the flow in the tundish is short and the volume fraction of dead zone is larger (27.9%); in case 2 (“damweirend dam” plan) the flow field conditions are prominently improved since the volume fraction of the full mixing flow zone and plug flow zone is increased and the dead zone decreased to 21%; in case 3 (“two weirtwo dam” plan) the residence time of the flow in the tundish is obviously reduced and the dead zone rate is minimum (16.7%) because the route of the flow fluid is extended due to installation of a group of dams and in the meanwhile the fluctuation value of the micro conductance is minimum (0.025 ms/cm). The optimal plan is therefore case 3. Related Articles | Metrics Select Study on key technology of X80 pipeline steel Steelmaking    2011, 27 (1): 41-45.   Abstract （540）            Knowledge map    Save The present paper expatiates the key technology taches of control on the oxygen, sulphur, nitrogen and inclusions in refining the X80 pipeline steel. The quality fraction of the dissolved oxygen of the pipeline steel X80 can be certainly controlled within the limit of (3~5)×10-6, and the oxygen in steel exists basically in the form of inclusions and it can be removed by means of Ca treatment, soft blowing, vacuum treatment and floating-up of inclusions in the tundish. In the meanwhile the hot metal protection has to be well made in the overall process and low sulphur slag shall be well prepared. The key tache for control of sulphur in steel is to keep the oxygen content in steel at an extremely low level and the initial Al addition fully in place in LF refining helps promote desulphurization. N pickup in the pipeline steel involves key taches:1), exposure of surface of liquid steel to the open air and insufficiency of continuous casting protection, 2), N pickup in the process of converter tapping as well as LF refining, and 3), vacuum treatment greatly help remove N. In Catreatment and modification of the inclusions in the pipeline steel the contents of Al, O, S and Ca shall be controlled appropriately and the quality fraction of the dissolved oxygen in the pipeline X80 is(3～5)×10-6 and at the temperature of 1,600 ℃ and lower the permissible quality fraction of sulphur in steel is(25.8～43.0)×10-6 and 21.6～36.0)×10-6 respectively. Related Articles | Metrics Cited: Baidu(3) Select Study on high temperature mechanical properties of NbTi orNbTiV microalloyed steels Steelmaking    2011, 27 (1): 46-49.   Abstract （1503）            Knowledge map    Save High temperature mechanical properties of cast slab of Nb Ti or Nb Ti V microalloyed steels have been tested by using a Gleeble2000 thermal simulation test machine. The test results indicate that the third brittle temperature range of tested steel are 600~850 ℃ and 750~900 ℃ respectively．The cracking sensibility and the mechanism of brittleness at the third brittle zone are investigated. The fracture morphology of billet at plastic temperature range and brittle temperature range are analyzed by SEM. The results will provide theoretical evidence for solving the defect of corner cracking of Nb Ti or Nb Ti V microalloyed slabs. Related Articles | Metrics Select Study of billet continuous casting technology for martensitic stainless steel Steelmaking    2011, 27 (1): 50-53.   Abstract （1262）            Knowledge map    Save A series of severe problems such as upgrowth of columnar crystals, central porosity and shrinkage cavity as well as hollow surface exist in the martensitic stainless steel due to the special properties of this steel grade. In light of the above mentioned conditions the solidification characteristics and high temperature physical feature of this steel grade are investigated and the processing problems in the process of casting the martensitic stainless steel solved and thus the quality of the products guaranteed. Related Articles | Metrics Cited: Baidu(1) Select Research on decarburization process of ultrapure ferrite stainless steel in VOD Steelmaking    2011, 27 (1): 54-56,6.   Abstract （1352）            Knowledge map    Save Based on the feature of stainless steel melting the effect of VOD process parameters on the decarbonization rate and end carbon is investigated by dynamics and thermodynamics analysis of decarbonization and a lot of industrial tests are carried out. The results indicate that higher decarbonization rate and lower end carbon content can be achieved by raising the melting temperature, increasing O2 flow rate and Ar blowing rate, reducing oxygen pressure and oxygen lance position. Related Articles | Metrics Select Effect of Ce on the impact toughness of 202 stainless steel Steelmaking    2011, 27 (1): 57-60.   Abstract （565）            Knowledge map    Save The changes in the impact toughness of 202 stainless steel by adding different contents of RE Ce element are investigated through mechanical performance testing, SEM and EDS. The results show that the inclusion morphology is changed and the impact toughness of 202 stainless steel is improved obviously within an appropriate limit since proper content of RE Ce element is added. 202 stainless steel with RE Ce element of 0.016% in mass fraction has the best impact toughness. Related Articles | Metrics Cited: Baidu(2) Select Analysis on coupled thermal stress of the submerged nozzle in pouring the steel Steelmaking    2011, 27 (1): 61-65.   Abstract （576）            Knowledge map    Save Using finite element method the temperature and thermal stress distribution of the submerged nozzle during preheating and pouring liquid steel is simulated. The results show that in the process of pouring liquid steel the submerged nozzle is subject to serious thermal shock, and the temperature undergoes a tremendous change in a short time, particularly the temperature at the region from the neck part to the top surface of the nozzle varies obviously with a stepshape distribution; Thermal stress at the interior wall in contact with liquid steel is very small and that at the exterior wall is much larger and with the advance of time the thermal stress field region gradually decreases along the radial direction of the nozzle. The higher the preheating temperature, the lower the thermal stress of the nozzle during pouring steel. Related Articles | Metrics Cited: Baidu(1) Select Endpoint control techniques for converter steelmaking Steelmaking    2011, 27 (1): 66-70.   Abstract （1382）            Knowledge map    Save The present paper summarized development of the end point control technique for converter steelmaking，introduced methods for end point control of converter steelmaking such as artificial experience control, static state control, dynamic state control and automatic control and etc，pointed out end point that application of the intelligence control technique including the neural network，fuzzy inference，and expert system etc, is proved to be the direction of development of the endpoint control technique for the large and medium sized converter steelmaking and affirmed that by introduction of the artificial intelligence endpoint control technique in steelmaking the compositions and temperature of the liquid steel can be accurately predicted, measured and controlled on the line at the end point of converter steelmaking and thus the duration of steelmaking can be effectively shortened, consumption reduced cost cut and product quality improved. Related Articles | Metrics Select Discussion on effective utilization coefficient of onlinetwooperating position LF Steelmaking    2011, 27 (1): 71-74.   Abstract （1657）            Knowledge map    Save In order to raise the effective utilization coefficient of the twooperating position LF in the steelmaking process flow of BOFLFCC the concept of effective utilization coefficient η for the online twooperating position LF is put forward under the specific hypothetical conditions by analyzing the process time of the twooperating position LF refining and the relation of η with the upstream process and downstream process discussed. Thereupon the effective utilization of the LF equipments can be evaluated and the number of related converters and maximum productivity of the continuous caster can be calculated as well. In the meanwhile the information can be used for guiding the design of the steelmaking plant and organization of production of the steelmaking shop. Related Articles | Metrics Select Calculation on the tilting moment of AOD and analysis on the strengthof its attached structure Steelmaking    2011, 27 (1): 75-78.   Abstract （576）            Knowledge map    Save In order to determine the tilting moment and strength of the important structures under different angles for 36 t AOD software “Solidworks” is applied to find out the position of gravity center of converter shell, steel liquid and attached structure at different angle. And thereupon by calculating the tilting moment the variation curve of the tilting moment is achieved and at the same time it's determined that at the rotation angle of 45~75 the AOD has larger tilting force. In the end the strength of the trunnion ring, an important component of AOD is analyzed with finite element software ANSYS and the stress value of trunnion ring Von-miseses with the variation of the rotation angle is obtained. As the results a calculation method and means is provided for the safety running and assessment of the structure of the similar kind. Related Articles | Metrics Select Study and practice on technologies of deep dephosphorization with single slag in 260 t combined converter Steelmaking    2011, 27 (2): 1-5.   Abstract （658）            Knowledge map    Save Based on the technical study of deep dephosphorization with single slag in the 260 t combined blowing converter some key controlling parameters which affects dephosphorization effect in converter such as blowing, forming and temperature etc, are optimized. And by taking rephosphoration control measures such as tapping with stopping slag, adopting low phosphorus alloy and modifying the top slag in ladle etc, the average phosphorus mass fraction could reach 75×10-6 at tapping in combined converter with single slag, and the average phosphorus mass fraction in finished product could reach 98×10-6. Related Articles | Metrics Cited: Baidu(9) Select Control practices of converter production with high cold charge ratio Steelmaking    2011, 27 (2): 6-9.   Abstract （1304）            Knowledge map    Save n light of the problem such as temperature and composition fluctuation,low hitting rate at the end point of converter production with high cold charge ratio ,a technology has been integrated and developed in Sansteel MinGuang Co., Fujian. It consists of four key techniques namely, 1) doublecombining process in single converter with high cold charge radio, 2) Quicktap automation steelmaking, 3) tapping with slag controlling and 4) deoxidization with CaC2. Compared to the conventional steelmaking process, phosphorus mass fraction at tapping is lowered by 0.0112 %，about over 50 %，CT double hitrate is 90.82 % and reblow rate is decreased from 28.37 % to 6.76 % and submaterial consumption for converters is decreased to 55 kg/t. Slag layer thickness in ladles after tap is controlled within the limit of about 27 mm. Related Articles | Metrics Cited: Baidu(1) Select Industrial test of 20CrMnTiH gear steel produced by BOFrectangular bloom caster route Steelmaking    2011, 27 (2): 10-12.   Abstract （515）            Knowledge map    Save The 20CrMnTiH gear steel is successfully produced in BX Steel Group by adoption of the technological route of “hot metal desulphurization pretreatment→combined blown process→LF plus RH refining→rectangular bloom CC (350 mm×470 mm)→hot charging walking beam type reheating furnace→24 high heavy rigidness and short stress rolling mill→temperature hold→finishing packing”. The chemical compositions of the finishing products Φ90～180 mm gear steel are in conformity with the controlling index and each and every physical examination index completely meets the technological requirements. Related Articles | Metrics Select Formation and control of longitudinal corner crack in heavy rail steel bloom Steelmaking    2011, 27 (2): 13-15,3.   Abstract （1422）            Knowledge map    Save n view of the longitudinal corner crack appearing in heavy rail steel factors causing the formation of the corner cracks such as mould precision, property of mould flux, casting temperature, fluctuation of mould level and operating process are analyzed. Results of study show that undesirable mould precision and low quality of mould flux as well as substandard operation are principal factors leading to formation of corner cracks. The corner cracks can be effectively controlled by intensifying the mould examination, improving the properties of the mould flux, optimizing the structure of nozzle and normalization of operation. Related Articles | Metrics Select Practice in controlling the quality of rectangular billet Steelmaking    2011, 27 (2): 16-20.   Abstract （677）            Knowledge map    Save Combined with the current situation of Chongqing Iron and Steel Co., Ltd., the reasons for rhombic、sag、bulging and inner crack of rectangular billet are analyzed and found that the primary cause to the quality defect is that the copper tube of the mould does not match with the steel grade and the casting speed. Thereby preventative and optimization measures are set up and the practical results are desirable. Related Articles | Metrics Cited: Baidu(1) Select Optimization of mould flux in continuously casting corrosionresistant steel by FTSR process and countermeasure for slab corner transverse crack Steelmaking    2011, 27 (2): 21-24,6.   Abstract （1387）            Knowledge map    Save In the process of trial production of the corrosion resistant steel used for heating radiator by FISR technology in Tonghua Iron & Steel Co., corner transverse crack and sticking accidents are apt to occur. In order to improve the uniformity of the solidification shell newly formed in the mould the chemical compositions and properties of the mould flux are optimized under the prerequisite that the good lubricating ability be ensured and thereby soft cooling of the shell at the meniscus of the mould is realized. Thereupon the cooling process for the mould and the second cooling segment is optimized and technical measures for prevention of corner transverse crack are put forward. As the results the surface quality of the thin slab is improved. Related Articles | Metrics Select Analysis of inclusions in cold rolling deepdrawn steel Steelmaking    2011, 27 (2): 25-28,4.   Abstract （731）            Knowledge map    Save The present paper introduces the content variation of T.O and N and inclusions in the cold rolled and deepdrawn steel DC06 and DC04 in refining the steel grade with LD→RH→CC route. The T.O mass fraction of DC06 through three minutes of RH alloying treatment is 77.08×10-6 and 44.98×10-6 in the end of refining and 44.38×10-6 in tundish and 24.23×10-6 in slab; that of DC04 is 69.35×10-6、41.55×10-6、38.05×10-6 and 23.55×10-6 respectively. In the process of RH refining N content is slightly reduced and in the pouring N pickup occurs to some extent. In the RH treatment and in the pouring the inclusion removal rate of DC06 is 44.0% and 32.7% respectively; and that of DC04 is 24.4% and 12.1%. In the location away from distance of a quarter of inside arch of the slab there are more micro inclusions of the unit area of the the slab than in other area. And this paper puts forward some control measure of the inclusions, it has great significance for production of clean steel. Related Articles | Metrics Select Ti content control of GCr15 bearing steel Steelmaking    2011, 27 (2): 29-32.   Abstract （559）            Knowledge map    Save Proceeding from the point of view of bearing steel production and quality requirements the main elements that influence \[Ti\] content of bearing steel are analyzed and discussed by laboratory experiments and statistical data of massive production. This paper discusses emphatically the effect of slag basicity, Al2O3, TiO2and AlS on the average mass fraction of titanium in bearing steel. The mass fraction of titanium in the steel can be controlled within the limit of 45×10-6by technical optimization. Related Articles | Metrics Cited: Baidu(3) Select Preliminary research on the behavior of limestone charged intoconverter in the process of making slag Steelmaking    2011, 27 (2): 33-35,5.   Abstract （593）            Knowledge map    Save The behavior of limestone which is utilized for slagging instead of lime during converter steelmaking process was discussed with the data collected from laboratorial and industrial experiments. The result can be concluded that: limestone which is directly charged into converter as slagforming material during early period of steelmaking process can be quickly decomposed and involved in making slag and in addition it has more advantages over lime in several respects; the anticipant result can be achieved using limestone to make slag, and limestone is completely decomposed during 5~6 minutes in converter steelmaking process; high temperature is propitious to calcium carbonate decomposing, just as the result of laboratorial experiments shows that the decomposition rate of CaCO3 at 1 400 ℃ is 3～4 times greater than that at 1 100 ℃ in spite of only 300 ℃ difference, therefore, the early period temperature has a great effect on the decomposition and slagging processes. Related Articles | Metrics Select A probing to technology of smelting high carbon steel with high manganese pig iron Steelmaking    2011, 27 (2): 36-40.   Abstract （1358）            Knowledge map    Save According to the thermodynamic equation of selective oxidation of CP and test results some regularities of smelting highcarbon steel have been discussed. It's determined that the best operating schedule for smelting the high carbon steel is the schedule of "highlowhighlow" oxygen pressure and operation at the lance position and the best slagforming schedule is assumed to be double slag process with appropriate amount of deslagging. A criteria value for the optimal slag series is put forward as well. Related Articles | Metrics Select Analysis on decarburization rate based on numerical simulation in EAF steelmaking Steelmaking    2011, 27 (2): 41-44,6.   Abstract （654）            Knowledge map    Save A threephase and threedimensional mathematical model for a 150 t EAF has been established with CFD software. The results of numerical simulation on the jet flow impingement depth are compared with that of the extrapolation by the water model experiments and they are in good agreement with each other. Simulation results show that an exposed liquid steel surface uncovered with slag layer is formed at the bathe surface due to the impingement of the oxygen jet flow and the exposed liquid steel surface is the main area where oxygen and the liquid steel are in contact with each other. By means of the infrared fume analytical technology based decarburization model the decarburization rate under the different conditions of the oxygen flow is measured in the process of EAF steelmaking and effects of the liquid steel flow rate flowing over the exposed surface on the reaction rate of decarburization is analyzed as well. Related Articles | Metrics Select Study on control of refining slag in clean steel production Steelmaking    2011, 27 (2): 45-47,5.   Abstract （538）            Knowledge map    Save The ladle slag control process in clean steel production is introduced and various properties of the modified refining slag investigated. Results show that the FeO and MnO quality fraction in the slag could be lowered to less than 3 % and low melting point and low viscosity ensured sound fluidity. The dissolution rate of Al2O3 into slag is relatively high, which resulted in high level of slab cleanliness. Strong desulphurization capability is obtained owing to the high optic basicity and desulfurization capability. Related Articles | Metrics Cited: Baidu(3) Select Study on using LF cold slag for desulphurization Steelmaking    2011, 27 (2): 48-51.   Abstract （1535）            Knowledge map    Save The present paper studies the compositions and sulphur content of the LF cold steelmaking slag series in the Anlong Iron & Steel Co., Ltd. and analyzes and discusses about thermodynamic and kinetic factors affecting the liquid steel desulphurization and puts forward the technological measures in respect of desulphurization of LF refining, in connection of the practical steelmaking conditions and characteristics of steel grades, in order to improve the oxidizability, Mannesmann index and amount of CaF2 in the slag. It also introduces technologies of how to reclaim the cold state steelmaking slag of the LF furnace for desulphurization purpose and therefore provides a more practical approach to the energy saving and consumption reduction for the iron and steel sector of China. Related Articles | Metrics Cited: Baidu(2) Select Study of inclusion size distribution in tundish of continuous casting machine Steelmaking    2011, 27 (2): 52-55.   Abstract （573）            Knowledge map    Save The size distribution of Al2O3 inclusion in Al killed liquid steel in the tundish is studied with a mixing model of constant flow stirred tank reactor and piston flow reactor. The flow fields and inclusion removal ratios of bare tundish and the tundish with dams and weirs are compared and the inclusion removal ratio of bare tundish is only 19%. However by installation of dams and weirs in the tundish the inclusion removal ratio reaches 37 %, which is greatly superior over that of the bare one owing to continuously growth of the grain sizes of the inclusions arising from turbulent flow and piston flow caused collision of the inclusions with each other. Related Articles | Metrics Select Water model experiments on surface flow fluctuation patterns in slab caster mold Steelmaking    2011, 27 (2): 56-60.   Abstract （1466）            Knowledge map    Save Using the slab caster mold of a specific steelmaking plant as prototype a water model with 1∶1 scale is built up and effects of the processing parameters such as drawing speed, outlet angle and submerging depth of the submerged nozzle and structure of the bottom of the water gate on the inner flow field and surface fluctuation of the slab mould are studied on the basis of the instantaneous wave height and the processing parameters for optimizing the flow field of the mould are put forward so as to provide necessary guide for reduction of slag entrainment in the mould in the actual production. Results show that drawing speed is the greatest influential factor to the level fluctuation of the mould and inclination of the nozzle is the next. The influence of each and every processing parameter on the inner flow field of the mould is restricted with one another; and in accelerating the drawing speed the submerging depth of the nozzle has to be increased appropriately so as to avoid slag entrainment due to surface fluctuation. Related Articles | Metrics Cited: Baidu(4) Select Numerical simulation on molten steel temperature drop of 210 t ladle Steelmaking    2011, 27 (2): 61-64.   Abstract （1500）            Knowledge map    Save By means of establishment of a finite element heat transfer mathematical model the transient temperature fields of the ladle during heat transfer process are simulated. The effect of different baking temperature and different adiabatic layer material of 210 t ladle on molten steel temperature drop is investigated by employing typical value method and energy conservation method. Molten steel temperature drop rate in different conditions has been predicted and the predicted values are compared with the measured ones. The results show that the temperature drop of the liquid steel is greatly affected by the baking temperature of the ladle; and the temperature drop rate of the hot metal in the process of casting is greater than that of the hot metal at stand by status; the onsite measured temperature drop rate lies in between the calculated value by the energy conservation method and by the typical value method. The simulation results provide a theoretical basis for reduction of the molten steel temperature drop in the Steelmaking Plant of Chongsteel. Related Articles | Metrics Cited: Baidu(6) Select Study on characteristics of flow area in annular gap washing device in converter Steelmaking    2011, 27 (2): 65-67.   Abstract （483）            Knowledge map    Save Characteristics of the flow area of annular gap washing device is investigated in this paper. The relationship between the minimum flow area and the position of movable inner cone is defined by a general formula.Based on this relationship, the formula of blocking flow rate is given，which can be used as a reference for the AGE design or operating. Related Articles | Metrics Cited: Baidu(1) Select Application of expert system of mould in continuous casting in Lingyuan Steel Steelmaking    2011, 27 (2): 68-70.   Abstract （1394）            Knowledge map    Save The present paper introduces installation of an expert system of mould in the continuous caster of the Converter Steelmaking Plant in Lingyuan Iron & Steel Group Co., Ltd. Results of practical running show that the system is running perfectly well. By application of the system not only the adhesive breaking out accident can be prevented, but the abnormal conditions of the processing parameters of the mould can also be measured out instantly and in the meanwhile the plan of mould flux and other operation is also optimized and thus the occurrence rate of longitudinal crack and adhesion is accordingly reduced. Related Articles | Metrics Select Review of heat transfer between mold and strand through mold flux film in continuous casting Steelmaking    2011, 27 (2): 71-73,7.   Abstract （556）            Knowledge map    Save This article is an overview about the recent researches on heat transfer performance of mold flux between mold and strand, its detection methods and heat transfer calculation both at home and abroad. It is concluded that the present heat transfer detection method which is based on the principle of one-dimensional theory can reflect the essential heat transfer properties of the mould flux and it can be used as the basis in selection of the proper mould flux. However it's considered that the research work uptodate is barely confined in very simple treatment on the slag film structure of the mould flux and ignores the heat transfer of the mould flux near the meniscus. Therefore it is needed to strengthen the study of heat transfer calculation of mould flux. Related Articles | Metrics Cited: Baidu(2) Select Status quo and progress of deoxidation technology for clean steel Steelmaking    2011, 27 (2): 74-77.   Abstract （614）            Knowledge map    Save The present paper introduces the status quo of the secondary refining (deoxidation) technology for clean steel making purpose, expatiates new progress of deoxidization by Mg evaporation method and the research on inclusions of deoxidization by titanium at JEF as well as the technical characteristics of deoxidization method using Ti plus rare earth adopted by Nippon Steel and indicates that formation and distribution of the inclusions in the process of hot metal deoxidization can be predicted and simulated by CFD model and points out that deoxidization by electrochemistry is a brand new technology for hot metal deoxidization without contamination and deals with the progress of application of oxygen penetration film in hot metal deoxidization by electrochemistry in POSCO. Related Articles | Metrics Cited: Baidu(1) Select Manual cleaning process on slag inclusion defects of continuous casting slab Steelmaking    2011, 27 (3): 1-3.   Abstract （1432）            Knowledge map    Save The present paper introduces the law of slag defect distribution in the CC slab in Baosteel and improvement in the manual scarring process.Results of examination show that by adoption of the improved process the slag defects can be effectively reduced and the quality of the slab surface raised as well and moreover the new process is simple and easy to operate and popularize. Related Articles | Metrics Select Introduction and controlling of hydrogenation in heavy rail steel Steelmaking    2011, 27 (3): 4-6.   Abstract （611）            Knowledge map    Save Effects of hydrogen in steel on the quality of steel and its harm to the heavy rail steel are described and detection method of hydrogen in steel and correlated equipments introduced as well.The origin and processing content of hydrogen in steel in production of the heavy rail steel by way of converter→LF→RH (VD) →continuous casting process route are expatiated and measures for effective control of hydrogen in the heavy rail put forward and actual results of application of the new method discussed. Related Articles | Metrics Cited: Baidu(3) page Page 1 of 3 Total 117 records First page Prev page Next page Last page