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Study on Refining Process for Improvement of Cleanliness of High Carbon Steel Steelmaking    2005, 21 (06): 41-43.   Abstract （4321）            Knowledge map    Save The cleanliness of high carbon steel from EAF-LF-CC billet has been notably improved by means of a series technical measures such as charging DRI, hot metal and pig iron, changing the deoxidation and desulphurization methods for EAF at tapping stage, using appropriate refining slag series and applying Argon gas soft stirring and protection casting practice etc. As the results, the total (O) content attains about 15 ppm, (N) about 45 ppm, (P) about 0.012% and (S) about 0.005%. The average of nonmetallic inclusions (5 μm) approaches to 3.29 entries/mm2 and the ratio of inclusions below 5 μm is 84%. The quantity of large inclusions in billets is less than 5.48 mg/10 kg.  Related Articles | Metrics Cited: Baidu(4)

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Recent Progress in Oxide Metallurgy Technology and its Application LIU Zhong-zhu;Mamoru KUWABARA Steelmaking    2007, 23 (04): 1-6.   Abstract （3254）            Knowledge map    Save The background of the proposition and development of Oxide Metallurgy Technology has been reviewed. The main concepts of that technology and its effects on the microstructure and performances of steel have been introduced. The recent progresses in pinning the grain growth at elevated temperature and nucleating the inter-granular ferrite from austenite, especially its mechanisms, have been summarized. The newly developed application of that technology in high heat input welding, rapid solidification and rolling processes, as well as in hot forged steel and heavy steel have also introduced. The developing trend of that technology has been forecasted. Related Articles | Metrics

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Preliminary Application of Premixed MgCa Desulphurizer in Hot Metal Desulphurization Steelmaking    2005, 21 (06): 12-15.   Abstract （2498）            Knowledge map    Save Based on the technological route and product mix program of the Central Steelmaking Plant of Chengdu Iron & Steel Co., Ltd., Pangang Group a complete set of processing parameters suitable for production such as injection pressure and injection rate are derived from both the theoretical study and production practice on the optimization of the hot metal desulphurization with Mg based desulphurizer. The production process requirements can be satisfied and the desulphurizing effect guaranteed and utilization of desulphurizer improved since the optimization of the injection technology, thus laying a very solid foundation for improvement of the productivity of the steelmaking system, metallurgical effects and consistent production. Related Articles | Metrics

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Effects of Inert Atmosphere and Reducing Agent on Melting Rate of Low Carbon Mold Flux of Continuous Casting Steelmaking    2005, 21 (06): 30-32.   Abstract （2439）            Knowledge map    Save The melting speed of low carbon CC mold flux composed of different carbon materials (graphite and active carbon) and different carbon mass fraction (2.6%~3.2%) is measured in the air and in the argon. Results indicate that the melting speed of the flux under the protection of the inert gas is slightly slower than that in the air. The effects of three different reducing agents (Si-Ca alloy powder, Si-Al-Ca-Ba alloy powder and Al powder) on the melting speed of a similar low carbon CC mold flux (carbon mass fraction 2.6%) are separately studied. Results show that the melting speed of the flux with addition of the reducing agent is far less than that of the flux without addition of any reducing agent, in which Al plays the most important role in retardation of flux melting. Related Articles | Metrics

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Calculation of alloy addition of BOF steelmaking based onpredicting yield model Steelmaking    2010, 26 (01): 44-47.   Abstract （2364）            Knowledge map    Save In the process of BOF steelmaking in order to figure out the reasonable amount of alloy addition during deoxidizing and alloying of tapping, the predicting model for alloying yield of tapping is developed based on the knowledge of alloying yield, using support vector machine; and the alloy addition with the yield figured out by the model is calculated. In the study simulation is carried out with the practical prodution data. Results shows that the alloy addition calculating model of BOF based on predicting yield is up to the mustard of practical manufacturing. Related Articles | Metrics

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Study on Breaking of Steel Wire 72A Steelmaking    2005, 21 (06): 18-22.   Abstract （2326）            Knowledge map    Save By way of analysis on the fracture of steel wire 72A during drawing the wire in the Capital Steel it's concluded that the primary causes to the fracture of the steel are inclusions, segregations and surface quality of the steel. In light of different conditions solutions to the wire breaking are put forward. Related Articles | Metrics Cited: Baidu(12)

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Development and modification of air blow deslagging technology for hot metal desulfurization in ladle Liu Xiao-qing;Tao yong-gang;Wang Qing-fang;Du Xiu-feng;Pan Yan-hua Steelmaking    2007, 23 (04): 14-17.   Abstract （2299）            Knowledge map    Save In hot metal desulfurization by pure Mg, problems frequently occur such as insufficient quantity of slag, high sulfur content and less flow-ability in slag , long time span for deslagging (up to 11 minutes) and heavy iron loss (up to 5 kg/t Fe), high resulfurization in steelmaking (up to w(S) 0.005 1 %) in NO.1 Steel-making Plant of WISCO. In order to solve those problems some technological measures have been taken in the Plant The efficiency of hot metal deslagging has been greatly improved ever since by adoption of the air-blow aided deslagging technology in which the air bubbling elements such as porous bricks are installed in the bottom of the ladle, properly selection of material for the air bubbling elements as well as appropriate selection of the installation position and continuously improvement of the technology in the actual production. As the results the average deslaggig time is cut to less than 7 minutes, average iron loss in deslagging declined from 5 kg/tFe to 3.5kg/tFe, average sulphur pick-up is declined from w(S) 0.005 1 % to w(S) 0.002 %,average life length is extended up to 110 . Related Articles | Metrics

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Technical Progress in Improvement of EAF Productivity Steelmaking    2005, 21 (06): 48-52.   Abstract （2296）            Knowledge map    Save The electric arc furnace steelmaking productivity has gained rapid progress in the recent years. The primary new technologies that improve the productivity of EAF mainly include EAF power input technology, oxygen input technology and EAF intelligent control technology (expert system). The technical and economical indexes of a few advanced EAFs at home and abroad have been compared. It’s concluded that improvement in the productivity of EAF is the inevitable road to the development of EAF steelmaking. Related Articles | Metrics Cited: Baidu(4)

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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

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Water Model and Numerical Simulation on Argon Blowing from Bottom of Ladle Steelmaking    2005, 21 (06): 33-36.   Abstract （2244）            Knowledge map    Save A water model for 130t ladle has been established and the mixing time of the molten steel in the ladle measured by conductivity method. The effects of different arrangement of permeable elements and different gas blowing rate on the mixing time of the molten steel in the process of ladle bottom argon blowing have been discussed. In the meanwhile the flow field inside the ladle is numerically simulated and the changes of the flow field in the ladle in different conditions are investigated and the optimal bottom argon blowing positions and argon bubbling patterns determined. Related Articles | Metrics Cited: Baidu(40)

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Mathematical Modeling on Dam Setting in Slab Continuous Casting Tundish Steelmaking    2005, 21 (06): 27-29.   Abstract （2234）            Knowledge map    Save According to the structure and process parameters of the tundish in a specific steel plant the hot metal flowing process and the retention conditions are mathematically simulated. The present paper numerically calculates, compares and analyzes the velocity vector diagram and RTD curve of the hot metal flowing under the different settings of the dams in the tundish using soft ware PHOENICS. Results show that the positions of the weirs and dams as well as space between them are of great significance to the hot metal flowing within the tundish. Related Articles | Metrics Cited: Baidu(5)

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Application of Refining Technology of Long Life Combined Blown Converter in CISCO Steelmaking    2005, 21 (06): 4-8.   Abstract （2230）            Knowledge map    Save The present paper introduces the characteristics of double circular seam gas elements and other equipments of the combined blown converter in CISCO. By stringent control of the bottom height of the converter to form a fine slagmetal mushroom head with steady and excellent permeability and by selection of appropriate supply patterns better combined blown effects have been achieved and in the conditions of furnace protection by slag splashing a long campaign life and 100% combined blown ratio realized as well. Related Articles | Metrics Cited: Baidu(2)

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Advance of Argon Blowing Technology in CC Tundish Steelmaking    2005, 21 (06): 53-56.   Abstract （2221）            Knowledge map    Save The present paper discusses the mechanism for removal of the inclusions by argon bubbling technology in the CC tundish as well as the main factors affecting the elimination rate of the inclusions in the tundish and reviews the math models modeling the gasliquid phase flow in the tundish in the process of argon blowing, probes to a few different argon bubbling technologies in the tundish and points out the current conditions of the argon blowing technologies in china. Related Articles | Metrics Cited: Baidu(9)

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Steelmaking    2005, 21 (06): 37-40.   Abstract （2215）            Knowledge map    Save The mass transfer characteristics of vacuum refining process under the top oxygen blown conditions in a RHMFB unit are simulated by experiment on absorption of CO2 using NaOH diluted solution, and influences of such a few factors as the lifting gas flow rate, top blow gas flow rate, top lance height, diameter of the up and down snorkels, immersion depth of the snorkels and number and distribution of nozzles on the mass transfer investigated by a 1∶5.45 water model of a 120 t RH-MFB unit and the volumetric mass transfer coefficients measured under the various parameter combinations and the relation between the volumetric mass transfer coefficients and partial pressure of CO2 further clarified. Results indicate that the mass transfer coefficients increase with growup of the lifting gas flow rate, top blow gas flow rate, partial pressure of CO2, inner diameter of snorkel and immersion depth of snorkel. Related Articles | Metrics

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Experimental Study on Deep Desulphurization of Clean Steel in Refining Process Steelmaking    2005, 21 (06): 23-26.   Abstract （2198）            Knowledge map    Save Based on the study of RH refining process the law of effects of high CaO slag series on the hot metal desulphurization is explored. Results show that it's definitely possible to refine the clean steel with（S） ＜0.005% provided that the constituents of the slag series are appropriate. In the meanwhile other factors such as the basicity of the slag series, slagging index and slag quantity will also have great effects on the endpoint sulphur content in steel. Related Articles | Metrics Cited: Baidu(2)

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Application of argonblow technology in cold heading steel YU Xin-he;WANG Jin-ping;ZHAO Ji-yu;CHEN Gang Steelmaking    2007, 23 (05): 5-8.   Abstract （2195）            Knowledge map    Save The present paper introduces the development and improvisation of the overall process of argon blowing in the NO.1 Steelmaking Plant of WISCO, in which the refining processes including slagformation, slag modification, Catreatment and temperature regulation originally carried out in LF are currently accomplished in the Argon Blowing Station. Very satisfactory castability has been achieved and the production cost remarkably cut down in application of the new technology. Analytical results show that the slag melting and inclusion control in steel in refining the cold heading steel by application of the optimized argon blow technology are similar to and even superior over the original LF process. Related Articles | Metrics

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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)

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Desulfurization technology by using Mg+CaO powder injection in hot metal ladle Steelmaking    2009, 25 (03): 1-4.   Abstract （2144）            Knowledge map    Save The hot metal desulfurization processes including TDS (Torpedo Car desulphurization), PTC (Hot Metal Pretreatment Center) and single lance and double lances desulfurization in a hot metal ladle at Baosteel are analyzed. It’s shown that the desulphurization process of Mg＋CaO powder injection into a hot metal ladle is prominently superior over the powder-injection desulhurization process in a torpedo car in the fields of injection duration, desulphurization effects, powder consumption, production organization and economic efficiencies. The injection duration for desulphurization can be reduced by over 50%, the end point sulphur content up to 0.001%~0.003%, the total powder consumption only 50% as much as the total consumption of CaC2 powder and 20% of CaO powder and the composite cost of this desulphurization process 18%~30% lower than that by TDS and PTC in a torpedo car. The desulphurization mode of Mg＋CaO powder injection into the hot metal ladle with a double lance is the best one. Related Articles | Metrics

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Application and numerical simulation on the wall design optimization for tundish Steelmaking    2007, 23 (04): 52-55.   Abstract （2133）            Knowledge map    Save With the purpose to bring down the inclusions rating of the steel billets through effective tundish wall design, 3-D numerical simulations have been carried out on the flow dynamic processes in the tundish of 4-strand CC in the 3rd Steel Plant Shougang and the effect of the flow field of liquid steel on the removal of inclusions in steel analyzed. Results of simulation and actual production show that by installation of high walls in the tundish inclusions can be reduced and V- shaped wall is more dependable and by use of the full wall with flow guiding orifices the inclusions can be more effectively removed since the flow field of the liquid steel is more appropriately distributed in the tundish. Related Articles | Metrics Cited: Baidu(3)

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Improvement in Internal Quality of Rectangular Bloom by Optimization of Continuous Casting Process Steelmaking    2005, 21 (06): 16-17.   Abstract （2121）            Knowledge map    Save The effects of continuous casting process parameters of the rectangular bloom on the internal quality of the bloom are analyzed and countermeasure to improve the process put forward. By optimization of the continuous casting process the internal quality of the bloom bas been raised and better metallurgical results achieved. Related Articles | Metrics Cited: Baidu(25)