Volumn Content

Steelmaking 2008 Vol.24 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Production practice of hot metal desulphurization in 300 t REN Xun Steelmaking    2008, 24 (01): 1-4.   Abstract （1866）            Knowledge map    Save On the basis of production practicethe present paper introduces the basic principle of hot metal desulphurizating reaction by injection of granular passivating magnesium in the 300 t HM ladle and discusses the factors affecting the desulphurizing rate and desulphurization results by magnesium as well as various technological measures WISCO has adopted since this technological process is applied in the No.3 Steel-making plant for more than one year in order to prevent against possible resulphurization at the end point in refining steel grades by converter and the prominent results achieved. Related Articles | Metrics Select Optimization and application of bottom blown process in 90 t LAI Zhao-yi;XIE Zhi;ZHONG Liang-cai Steelmaking    2008, 24 (01): 5-8.   Abstract （2042）            Knowledge map    Save Physical modeling experiments have been carried out on the bottom tuyere configuration of the 90 t top-bottom combined blown converter at Sanming Iron & Steel Co., Ltd. Results of the production application show that the mixing time of the hot metal in the bath has been shortened by 28% by application of asymmetric configuration of the bottom tuyeres along the trunnion direction of the converter other than by the original symmetric configuration and in the meanwhile the technical indicators of the top-bottom combined blown converter refining have been greatly improved since optimization of the bottom tuyere configuration, for instance, the end point [O] has been reduced by 0.016%, end point [C]x[O] reduced by 0.0006, end point [Mn] increased by 0.029% and the T.Fe content in the end point slag reduced by 2.21% respectively on average. Related Articles | Metrics Select Application of Bombing Detection Technology in Converter Steelmaking YAN Hai-long;SONG Li-dan;ZHANG Wen-hua Steelmaking    2008, 24 (01): 9-11,1.   Abstract （1434）            Knowledge map    Save The present paper briefly describes the structure of equipments of the bombing detection system (TCO), the technological principle and application of the technology in the steelmaking and specially introducs the results of application of TCO in 40t converter in Jiangyin Huaxi Iron & Steel Co.，Ltd and points out that there is a bright prospect for popularization of this technology in China. Related Articles | Metrics Select Continuous control of BOF by gas analysis WU Liang;JIANG Zhou-hua;GONG Wei;ZHAO Guo-guang;ZUO Kang-lin Steelmaking    2008, 24 (01): 12-15.   Abstract （1669）            Knowledge map    Save Based on the data of gas acquired from the infrared analyzer and model calculation as well as on the material balance and thermal equilibrium in the bath of converter the present paper demonstrates the feasibility of prediction on the carbon content and temperature in continuous control of the converter by way of gas analysis and then reaches the conclusion that a higher hit rate can be achieved by gas analysis when the end point carbon content is less than 0.06% and is more suitable for refining low carbon steel. However since all data for predicting the temperature are acquired indirectly the hit rate of temperature prediction is inevitably lower by the gas analysis. Related Articles | Metrics Cited: Baidu(1) Select Improvement in RH productivity by optimization of production managerial mode DONG Jin-gang;MA Zhi-gang Steelmaking    2008, 24 (01): 16-18.   Abstract （2120）            Knowledge map    Save RH has already become the key process in refining the high quality steels because of its powerful function. With the increase of hot metal quantity in the upstream processes and with an increased demand of high quality steels in the downstream processes the RH in the No.1 Steel-making Plant has already become the bottleneck affecting increase of the high quality steel productivity. Upon analysis of the factors affecting the RH productivity in No.1 Steel-making Plant the management optimization is carried out in the Plant including the principle of RH production schedule, RH steel allocation to the continuous casting machine, RH task division, reduction of RH treatment cycle, ingot steel production schedule and match of ingot steel and continuous casting steel. As the results the daily average productivity of RH treatment has increased 2.9 heats and the ratio of non-RH treated steels decreased accordingly. Related Articles | Metrics Select Cause and solution to longitudinal edge crack in slab TANG Sheng-bin Steelmaking    2008, 24 (01): 19-21,3.   Abstract （1515）            Knowledge map    Save The present paper carefully investigates and analyzes the causes to the longitudinal edge crack of slab and finds out that the primary cause is inappropriate distribution of the cooling water slits of the mould copper plates. By optimization of the cooling water slits of the mould copper plates and perfection of part of the processing parameters the longitudinal edge cracks have been effectively eliminated. Related Articles | Metrics Cited: Baidu(3) Select Cause analysis on and preventative measures for CC bloom breakout CHEN Liang Steelmaking    2008, 24 (01): 22-25.   Abstract （829）            Knowledge map    Save The continuous casting bloom breakout accidents in Panzhihua Steel Works have been analyzed and the primary cause to the accidents determined. In order to control the breakout accidents the original operating processes in the plant have been optimized and other countermeasures put forward as well. As the results the breakout accidents in the Plant have been greatly reduced. Related Articles | Metrics Select Process practice and analysis on free-cutting steel XY45 HU Xun-pu;YANG Qi-yun Steelmaking    2008, 24 (01): 26-30.   Abstract （1842）            Knowledge map    Save The present paper sums up the key factors in the technological processes such as the metallurgical process, continuous casting process and rolling process to ensure the product quality in production of the free-cutting steel XY45 and makes the theoretical analysis on those factors accordingly. Practice indicates that products in conformity with the specified standards can be finally produced so long as the [O] and [S] contents are well controlled and m(Mn)/m(S) is confined within the limit of 4.0 to 5.5 in the process of refining; and the processing parameters such as the overheating are strictly controlled and the quality of the slabs is well improved in the process of continuously casting; and the temperatures are well controlled in rolling. Related Articles | Metrics Select Thermodynamic analysis on gasificating dephosphorization of converter slag by silicon reduction WANG Shu-huan;WU Yan-qing;XU Zhi-rong;LV Xiao-fang;ZHANG xiang;WANG Chun-mei;LIU Tai-xin Steelmaking    2008, 24 (01): 31-34.   Abstract （1848）            Knowledge map    Save According to the ionic theory proceeding from the thermodynamic analysis of converter slag dephosphorization the final products in the gasification dephosphorization reaction have been calculated and determined, thus providing a theoretical basis for thermodynamic feasibility of gasification dephosphorization in the process of furnace protection by slag splashing. Results show that gasification dephosphorization in converter by slag reduction is feasible. Effects of such a few factors as temperature, basicity, FeO content and flowing nitrogen on the balance partial pressure are discussed. Related Articles | Metrics Cited: Baidu(3) Select Math model on solidification process of thin slab continuous casting and analysis of secondary cooling parameters LI Wei-biao;LI Bao-kuan Steelmaking    2008, 24 (01): 35-39.   Abstract （1849）            Knowledge map    Save Since the cooling conditions required by the high quality thin-slab continuous casting process are extremely stringent a math model of solidification and heat transfer has been developed in a bid to study the thin-slab continuous casting process. The effects of various processing parameters on the solidification process with the mould and in the secondary zone have been quantitatively analyzed as well. Related Articles | Metrics Select Effect of mould electromagnetic stirring on carbon segregation of medium carbon continuous casting bloom LI Guo-zhong;CHEN Feng;CHEN Wei-qing;FENG Jun;HUI Rong Steelmaking    2008, 24 (01): 40-43.   Abstract （1602）            Knowledge map    Save Effect of M-EMS intensity on carbon segregation and micro-solidification structure has been studied on medium carbon bloom with a section of 180mm×180mm. Results show that with an increase of M-EMS current intensity in the mould the equiaxial crystal is increased and the secondary dendritic arm spacing and the central carbon segregation are decreased, yet the inter mediate carbon segregation in the bloom is increased. Therefore higher M-EMS current intensity is inappropriate for medium carbon bloom. It’s proved that intermediate carbon segregation in the medium carbon bloom is closely related to the occurrence of white band. Related Articles | Metrics Cited: Baidu(9) Select Evaluation on surface transverse cracking of continuous casting 15CrMo steel bloom MIAO Xing-de;REN Yi-feng;ZHAO Han Steelmaking    2008, 24 (01): 44-46,5.   Abstract （2084）            Knowledge map    Save The longitudinal crack on the surface of the rolling stock of 15CrMo steel arises mostly from the transverse crack existing in the continuous casting bloom. The transverse crack in the continuous casting bloom often occurs along the intergranular boundary of the super large prior austenite grains (diameter of the grain ＞1 mm) as soon as the mould temperature arrives at 1 300℃. The intergranular crack of the continuous casting bloom has been analyzed by macro examination, metallographical observation and SEM analysis and the method for determination of the surface intergranular crack of the CC bloom is provided as well. Related Articles | Metrics Select Numerical simulation of flowing field of axial symmetrical turbulence jet flow LIU Kun;ZU Miao-yong;GAO Yin;WANG Ying-bin;BI Xiao-fu Steelmaking    2008, 24 (01): 47-50.   Abstract （1805）            Knowledge map    Save Numerical simulation of the jet flow field out of the Laval tube has been carried out by commercial software CFX4.4. Effects of different stagnant pressure and ambient temperature on the flow field on the central line of turbulence jet flow axis have been analyzed and discussed By comparison of the previous simulation results with the on-site operating curve of the oxygen lance the adaptability of k-εturbulence model in description of the turbulence jet flow field is verified. Related Articles | Metrics Cited: Baidu(2) Select Application of regenerative combustion technology in ladle burner JIA Cheng;YIAN zhen-wu;LIN Yun-zhi Steelmaking    2008, 24 (01): 51-53.   Abstract （1935）            Knowledge map    Save The present paper introduces the working principle and effects of application of the regenerative ladle burner. In comparison of the technological properties of the burner before renovation with that after renovation the improvised burner is featured of such a few advantages as being capable to preheat air (gas) to over 1 000 ℃, reduction of gas consumption by about 40%, acceleration of the burning speed 0f about 15 min, homogeneous temperatures distribution in the inner lining of ladle and low discharge of CO and NOx gases. Related Articles | Metrics Cited: Baidu(1) Select Revamp of equipments and optimization of process for high speed slab continuous caster WANG Hong-feng Steelmaking    2008, 24 (01): 54-57,6.   Abstract （2153）            Knowledge map    Save The present paper introduces the technological processes and revamp of equipments of the No.2 High Drawing Speed Continuous Caster in Meishan Steel Co., including mould cooling technology, properties of mould flux, mould oscillation parameters, installation parameters of the foot roller of the mould, optimization of the secondary cooling process and caster gap as well as improvement of the Hydraulic Pressure Station of the Continuous caster and briefly describes the achievements obtained in the practical production. Related Articles | Metrics Cited: Baidu(1) Select Selection of hot metal pretreatment mode for new steel-making plant ZHANG Long-qiang;TIAN Nai-yuan;XU An-jun Steelmaking    2008, 24 (01): 58-62.   Abstract （1779）            Knowledge map    Save The optimal order of the hot metal pretreatment achieved by thermodynamic calculation and comparison of different flux and pretreatment methods is hot metal desulphurization-desiliconizaton and dephosphorization. The pretreatment containers determined by comparison of the thermodynamic conditions for different flux and different pretreatment methods are as follows: ladle for desulphurization by KR and converter for desiliconization and dephosphorization exclusively. It’s concluded by comparison analysis of the operation cost for hot metal pretreatment that special converter be selected to carry out dssiliconization and dephosphorization simultaneously and for the purpose of desulphurization KR method (CaO used as the desulphurizer) be adopted. The optimal hot metal pretreatment mode for the newly built steel-making plant is determined to be hot metal desulphurization in ladle by KR method (CaO as desulphurizer) and desiliconization and dephosphorization in converter. Related Articles | Metrics Cited: Baidu(18) Select Practice of digitized control technology of converter shape HUANG Biao-cai Steelmaking    2008, 24 (02): 1-3,14.   Abstract （2255）            Knowledge map    Save By quantitatively depicting the dynamic changes in the furnace shape of the 100 t combined blown converter with the digitized control technology and thereupon taking some appropriate shape control measures in Fujian Sansteel, not only converter lining safety and stable production during a campaign are ensured, but the top and bottom combined blown converter service life is also extended to 20046 heats synchronously. Related Articles | Metrics Select Application of mould breakout prediction technology WANG Hong-feng;ZOU Jun-su Steelmaking    2008, 24 (02): 4-6,10.   Abstract （1930）            Knowledge map    Save The present paper introduces the mould breakout prediction technology and application of this technology in the production practice in the No.2 Slab Caster of MEISHAN Steel-making Plant. By analysis on the different kinds of the alarm information from the mould breakout prevention system the problems existing in the production can be found out and the operation and process of the continuous casting production further be improved. And moreover the mould breakout prediction and prevention system can be further perfected by application of the intelligent automation. Related Articles | Metrics Select Application of ladle slag modifier in refining Q345C in LF WANG Shi-jun;ZHANG Feng;LIU Xiao-chen;LIU Yan-ping;TAO Chuan-jun Steelmaking    2008, 24 (02): 7-10.   Abstract （2033）            Knowledge map    Save The application of ladle slag modifier in production of aluminum steel Q345C in a 50t LF is introduced. Results show that since application of the experimental ladle slag modifier in the steel production the aluminum yield has been increased, deeep desulphurization and deep dephosphorization of the hot metal intensified, the TFe content in the refining slag dramatically reduced, the mechanical properties of rolled stocks greatly improved and the cost of production for Al containing steel decreased Related Articles | Metrics Select The study of nonmetallic inclusions in continuous casting big blooms YANG Yu;PANG Zhao-fu;CHEN Xin;JIN Ji-yong Steelmaking    2008, 24 (02): 11-14.   Abstract （2041）            Knowledge map    Save The article did the detailed analysis of the distribution of the inclusions in different parts of the continuous casting square blooms. The results show that the first blooms of the first stove apparently contains much more inclusions than others. The sulfide inclusion is mainly in the form of ferric sulfides; The oxides inclusion is mainly in the form of silicon dioxide; It is also found that the amount of inclusion at about ¼ of the inner and outer arc and ¼ lengths from left and right is much more than other places. Related Articles | Metrics Cited: Baidu(1) Select Physical simulation and practice of molten steel fluidity CHEN Shu-sen;CHENG GUO-guang;CHENG Zi-jian;CHENG Dong-quan; Steelmaking    2008, 24 (02): 15-18,3.   Abstract （1923）            Knowledge map    Save In order to improve the availability of the tundish the structural parameters of the flow control devices with different weir,dam and turbulence inhibitor was optimized to increase the retention time of the hot metal so as to remove inclusions as much as possible and improve the uniformity of temperature and compositions of the hot metal in tundish and to reduce the dead zone in the tundish and ensure a full mixture zone in an appropriate size and a plug volume zone. The present paper studies the tundish of the slab continuous caster in JISCO. A 1:3 scale water model simulating the hot metal flowing from ladle, long nozzle to tundish is established. By measuring the RTD curves in the water model the retention time, peak time and mean residence time are obtained and by calculating these time values the structure of the tundish is optimized. Related Articles | Metrics Select Water model simulation on liquid steel level fluctuation of cast mould at No.2 Steel-making Plant of TISCO XU Fang-hong;LI Liang;IANG Zhou-hua Steelmaking    2008, 24 (02): 19-21,6.   Abstract （1957）            Knowledge map    Save The effects of entry angle and submergence depth of the nozzle as well as the casting speed on fluctuation of the liquid steel level of the mould have been researched by water model simulation of cast mould in the No.2 steel-making Plant of TISCO. In the experiments the appropriate casting speed values are determined to be 0.8 m/min, 0.85 m/min and 0.9 m/min separately, and the entry angle determined is 10, 12 and 15 degree respectively and the submergence depth is controlled within the limit of 60~160mm (20mm space) in light of the practical production conditions. It’s verified out of the experiments that the effect of the entry angle of the nozzle and the drawing speed on the liquid level fluctuation is of insignificance, whereas the effect of the submergence depth of the nozzle on the liquid level fluctuation is very prominent. Experimental results show that the down- grade ratio of the cold rolled stainless steel sheet 0Cr18Ni9 has been lowered to 4.80 % from 6.38 % since the readjustment of the submergence depth of the nozzle to 130mm from original 110mm. Related Articles | Metrics Cited: Baidu(1) Select Research and application of thermo-mechanical stress model for bottom working lining of 250～300 ton ladle JIANG Guo-zhang;KONG Jian-yi;LI Gong-fa;TAO Xiao-lin;HU Tie-shan Steelmaking    2008, 24 (02): 22-25,4.   Abstract （2014）            Knowledge map    Save Ladle is a sort of important equipment in the metallurgical industry and its lifetime is of direct influence on the normal production of the whole enterprise. Five structural models of ladle bottom have been established and bottom stress distributions of these models calculated by using finite element method. Then the model of the fifth scheme is determined to be the best one by comparison of each with other and then this model is applied to actual production of ladle. Application of the model on site indicates that ladle’ lifetime is greatly improved. Verification on the model of the fifth scheme demonstrates that this method is feasible to improve ladle’s lifetime. Related Articles | Metrics Select Research on erosion of AOD final slag to MgO-CaO refractory ZHENG Hong-guang;ZHU Fang-yi;LIU Tao;CAI Ci;SHI Jin-hong;CHEN Wei-qing Steelmaking    2008, 24 (02): 26-29.   Abstract （1988）            Knowledge map    Save The influence of the slag basicity, MgO, CaF2 and Al2O3 content in AOD final slag on erosion of MgO-CaO lining is investigated. The erosion of the same slag onto the MgO-CaO crucible with different CaO content is compared. The reaction layer of slag-refractory is analyzed by means of the Scanning Electron Microscope. The results show that the slag basicity is the most important factor to MgO-CaO lining erosion. The erosion is remarkably reduced with the increase of basicity, and with the increase of MgO content or the decrease of CaF2 content in slag. It is also observed that the erosion resistance to CaO-SiO2-MgO slag is enhanced with the increase of CaO content in MgO-CaO refractory. Related Articles | Metrics Cited: Baidu(1) Select Discussion on conditions for hot metal deep dephosphorization QI Jiang-hua;XUE Zheng-liang;LI Zong-qiang;ZHAO Dong-nan Steelmaking    2008, 24 (02): 30-33.   Abstract （1942）            Knowledge map    Save Deep desulfurization experiments have been repeatedly conducted in the induction furnace. Through theoretical and experimental analysis on the effects of the initial sulfur content, desulphurizing refining slag, oxygen content and slag amount in the hot metal on the hot metal deep desulphurization a few main conditions required for hot metal deep desulphurization in the inducton furnace have been determined. Related Articles | Metrics Select Microstructures and properties of V micro-alloyed hot rolled dual phase steel WANG Yin-feng;HE Yi-zhu;SU Shi-hua;HU Xue-wen Steelmaking    2008, 24 (02): 34-37.   Abstract （1941）            Knowledge map    Save the present paper studies the micro-structures and properties of the test piece of V micro-alloyed hot rolled steel and analyzes precipitation of elements V(C,N) and the strengthening mechanism of the precipitates on strength of the testing piece. Results show that the micro-structures of the test steel are composed of polygon ferrites, bainites and trace of martensites and the average grain size of the polygon ferrites is about 7µm, the tensile strength of the steel is over 570 Mpa and the mechanical properties are excellent. The TEM observation shows that there are precipitated V(C,N) particles in the steel. Precipitation may occur randomly in the ferrites or along the dislocation line. The strength of the test steel can be enhanced through precipitation of the second phase particles V(C, N). Related Articles | Metrics Cited: Baidu(3) Select Laboratory study and mechanism analysis on deoxidation of barium alloy in clean steel production WANG Zhong-ying;WU Xiao-dong;LIU Xing-guo Steelmaking    2008, 24 (02): 38-41,4.   Abstract （1884）            Knowledge map    Save The effects of hot metal deoxidization by Barium alloy in steel-making process have been studied from the point of view of bearing steel production. The results show that once the oxygen in steel is rapidly reduced to a specific stable level the Barium containing inclusions will be very easily removed from the molten steel and the total inclusions of ingot or billet are reduced obviously. Therefore the molten steel can be purified if the Barium alloy is used to treat the steel. Related Articles | Metrics Cited: Baidu(2) Select Optimization geometry of submerged entry nozzle for bloom continuous casting mould GAO Ze-ping;SU Zhen-jiang Steelmaking    2008, 24 (02): 42-45.   Abstract （1728）            Knowledge map    Save By physical simulation the surface fluctuation, impacting pressure and impacting height as well as covering of flux of the designed mould series under the various working conditions have been measured and analyzed and by optimization of the measured values the best nozzle is found out, then the characteristics of the flow field and temperature field of the liquid steel in the mould of the selected nozzle are analyzed by application of the flow field calculation software FLUENT and water model, and thereupon the geometry of the submerged nozzle best suitable for the bloom continuous casting is selected and verified in the practical production.. Related Articles | Metrics Cited: Baidu(7) Select Industrial scale experimental study on foaming behavior of slag for stainless steel-making FAN Rong-wei;MENG Qing-yu;HONG Xin;ZHANG Mei-ming;LI Qing Steelmaking    2008, 24 (02): 46-49.   Abstract （1889）            Knowledge map    Save On the basis of results of the laboratory study on the low fluoride carbonate foaming slag the industrial scale experiments on foaming behavior of the slag have been carried out in a 100t EAF in refining stainless steel in Baosteel. Results show that the newly developed foaming agent has excellent foaming behavior, and the foaming behavior is related to the way of addition and the particle size of the foaming agent. The optimal way of the foaming agent addition is obtained by summarizing the experimental results and the influence of particle size on the slag foaming behavior analyzed in detail. Related Articles | Metrics Cited: Baidu(1) Select Preparation and application of bauxite-based prefabricated block for electric furnace roof ZHU Hong-xi; DENG Cheng-ji; BAI Chen; GE Shan; LIU Kui-ran; ZHONG Xi-qing Steelmaking    2008, 24 (02): 50-53,5.   Abstract （1813）            Knowledge map    Save In light of actual conditions of undesirable performance of the refractory blocks previously used for EAF roof, a kind of prefabricated monolithic refractory block which is easy to be assembled and fixed up for the block-type EAF roof has been designed and manufactured. .The effects of such a few processing factors as the grain sizes and shapes of the particles as well as the binder, additive and dehydrating agent on the performance of the prefabricated block for EAF roof have been investigated. The optimized aggregate composition of the bauxite based prefabricated refractory block used in the electric furnace roof involve grain size in 8～5mm 10%:5～3mm 20%:3～1mm 20% and1～0mm 20% and the refined powder takes up 30% of the total. The ingredients of the binding materials are composed of 5 % CA80 cement, 3 % silica micro-powder or 3 % ~ 5 % ultra-fine alumina powders, and 0.2 % trimeric sodium phosphate and hexamet sodium phosphate. The bauxite based prefabricated blocks for EAF roof produced in this way have been used in a number of steel-making works and very satisfactory results have been achieved. It’s reported that in a specific steel-making works the campaign life of the EAF roof made of this block exceeds 600 heats. Related Articles | Metrics Cited: Baidu(6) Select Investigation of active lime liquation in initial slag of steelmaking MENG Jin-xia;CHEN Wei-qing Steelmaking    2008, 24 (02): 54-58.   Abstract （1954）            Knowledge map    Save Influences of lime calcination temperature as well as compositions and temperature of slag on active lime liquation in initial slag of converter steelmaking are investigated by means of the rotating cylinder method. The results show that liquation rate of active lime calcined at 1000℃ reaches the highest. Increase of FeO, less MgO content and lower slag basicity, and higher temperature are in favor of active lime liquation in slag. Process of active lime liquation in initial slag of converter contains the surface dissolution and the lime metamorphism disaggregation due to penetration of slag, in which case the latter is crucial. Related Articles | Metrics Select Progress of oxygen lances in EAF steelmaking WANG Zhen-zhou;ZHU Rong Steelmaking    2008, 24 (02): 59-62.   Abstract （1854）            Knowledge map    Save How to effectively inject oxygen into the EAF and accelerate melting of the scrap steel is key to speeding up EAF melting process. The present paper summarizes the characteristics of development and application of oxygen Lances used in EAF at home and abroad, introduces and compares their characteristics one by one and thereupon foresees their prospects of application in EAF refining in the future. Related Articles | Metrics Select Controlling on the quality of special steel billet produced by BOF-LF-CC process CAI Kai-ke;SUN Yan-hui;QIN Zhe Steelmaking    2008, 24 (03): 1-6,16.   Abstract （1913）            Knowledge map    Save Quality of finished steel product were effected by billet quality produced by BOF-LF-CC process. In this paper, [C] controlling in BOF, deoxidization and inclusions controlling, molten steel composition, top slag controlling and billet Internal quality were analyzed by anther experience and references. The demand of special for middle/high carbon strand must be content as follow us: the molten steel composition controlling in a narrow rang, molten steel being clean(T.O about 20ppm), billet Internal steel qualing free defect (minimized shrinkage ), billet centre element (C, Mn, S, P)segregation should be minimizing. According to the practice production of home and abroad, the demand mentioned above can be met by reasonable technology in BOF-LF(VD)-CC process. Related Articles | Metrics Cited: Baidu(7) Select Practice of improvement in life of hot metal desulfurization lance YIN Wei-ping;LI Zhong-yang Steelmaking    2008, 24 (03): 7-9.   Abstract （1860）            Knowledge map    Save According to the damage principle of desulfurization injection lance in No.1 Steelmaking Plant of Jinan Iron&Steel Group Co.,the injection life is increased from 200 minutes to above 900 minutes and the problem of injection lance blockage is settled successfully by improving the lance structure, optimizing the product process of injection lance and raising the performance index of refractory material. Related Articles | Metrics Cited: Baidu(2) Select Optimizing manufacturing management and increasing LF productivity DONG Jin-gang;TANG Li-xin Steelmaking    2008, 24 (03): 10-12.   Abstract （1755）            Knowledge map    Save Because of the increased demand of the quality steel by the down-stream process and market since the commissioning of the 4th Blast Furnace the LF process has turned to be one of the bottlenecks affecting productivity and logistics in the 1st steelmaking Plant. On the basis of analysis on the factors affecting the LF productivity, a series of technological measures have been adopted including optimization of the refining process, production flow and production management and etc. As the results the ratio of non-LF process steel has been decreased and the LF productivity raised up. Related Articles | Metrics Select Change in cleanliness of GCr15 bearing steel in LF refining ZHANG Shu-hai ;XING Mei-luan; HAOYan-ying; SUN Yu-chun Steelmaking    2008, 24 (03): 13-16.   Abstract （1895）            Knowledge map    Save This paper investigates the oxygen content and non-metal inclusions of the GCr15 bearing steel in each and every phase of the LF refining process. The results indicate that in the existing process conditions the oxygen content of steel has been reduced to a lower level through 15 to 20 minutes of LF refining. The appropriate time for soft blowing upon completion of LF refining is proved to be about 15 minutes. The dimension of the non-metal inclusions at the end of LF process is below 15μm; To reduce the secondary contamination of steel the casting process should be strengthened. Related Articles | Metrics Select Development on multifunction refinement technology of argon-blowing station YIN xiang-bing;HUANG cheng-hong;LI ju-zhong Steelmaking    2008, 24 (03): 17-20.   Abstract （1931）            Knowledge map    Save After argon-blowing station reformation of NO.2 Steel-making Plant of WISCO, the molten steel argon-blowing refinement can satisfy the actual production more.After over one year developping ,the argon-blowing station has following various functions: CAS argon -blowing in ladle of molten steel 、 tiny adjustment composition Si, Mn, Ti, Nb, tiny adjustment temperature degree, tiny adjustment composition Als through feeding Aluminum line、tiny adjustment composition C through feeding Carbon line、adjustment temperature degree and sampling of RH molten steel 、 improve argon-blowing success rate through trying blowing Argon before tapping steel,, lower the production cost and cut process time greatly. Related Articles | Metrics Select Research on matching productivity in BOF-LF-CCM processin Xingtai Iron & Steel Co., Ltd YIN Jia;LIU Qing;TIAN Xin-zhong;HU Li-ning Steelmaking    2008, 24 (03): 21-24.   Abstract （1896）            Knowledge map    Save On the basis of research of the current productive operation of BOF steelmaking workshop in Xingtai Iron & Steel Co., Ltd, and proceeding from the basic parameters of the mass quantity the present paper analyzes the capacities of the converter, ladle furnace and continuous caster in the process of converter steel-making and probes to the mode of match of the steel-making flow. Related Articles | Metrics Cited: Baidu(2) Select Experimental study on simulation of injection desiliconization in ladle YANG Shi-shan;LIU Zhi-min;LIU Sheng-tao;GUO Qiong;WEI Yao-huan;LI Zhi-qiang Steelmaking    2008, 24 (03): 25-29.   Abstract （1907）            Knowledge map    Save An experimental study was carried out on simulation of hot metal injection desiliconization in ladles by way of multi-batches top addition of desiliconization reagents plus partial immersion blowing of gaseous oxygen in SiC tube furnace at 1350℃. Three kinds of desiliconization reagents can all meet the requirements of injection desiliconization in ladles with desiliconization capacity of LD dust > mill scale > iron concentrates. Partial immersion blowing of gaseous oxygen can obviously increase the desiliconization velocity and greatly shorten treatment time. The optimum compositions and usage of the injection desiliconization reagents are recommended and the coverter dust without addition of CaO is proved to be the best desiliconizer.Using it as the desiliconizer not only the wear of the grinding machinery can be reduced, but the power consumption in operation also greatly lowered. Related Articles | Metrics Cited: Baidu(3) Select Study on refiing high phosphorus hot metal by combined blown converter WU Wei;LIU Liu;LI Jun;GAO Jian-jun;LIU Guang-zhi;MA Zhi-ming;LI Yutian;REN Jian-zhong Steelmaking    2008, 24 (03): 30-32.   Abstract （1859）            Knowledge map    Save The experimental study is carried out on hot metal pretreatment (dephosphorizatin) and steel-making using w(P)=0.28%~2.02% hot metal as starting material in a 500kg induction furnace in simulation of a top-bottom combined blown converter. Results show that the dephosphorization rate of the hot metal arrives at 67% to 86% in the initial dephosphorization pretreatment stage and upon completion of decarburization in steel-making the dephosphorization rate cliimbs to as high as 86% to 97%. The primary factors affecting the dephosphorization rate of the hot metal are basicity of the converter slag, oxygen supply rate and temperature of bath. Related Articles | Metrics Cited: Baidu(4) page Page 1 of 3 Total 93 records First page Prev page Next page Last page