Steelmaking

Development and application of converter steel slag disposal technology

LIN Dong;TAO Li-qun;TAN Ming-xiang;PENG Fei;DONG Zhi-peng

2007, 23(05): 1-4. doi:

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Practical results show that the rotating wheel type water quenching disposal of steel slag technology developed by Bengang is of great safety and reliability, in which the slag is very well separated from the liquid steel and the slag disposal rate reaches as high as 8 t/min. Moreover the process layout is compact; the structure of the main equipments for the process is simple and plant area needed for this subject is small; the speed of the hydraulic tilting pot for the steel slag granulation purpose is adjustable; the controllable range of the granulation cycle is relatively great (within 5 to 15 minutes) and the grain sizes of the steel slag after water quenching are rather homogeneous and of the total slag those in the grain size of less than 5 mm account for over 95%. All those advantages are of great benefits to further application of the steel slag.

Application of argonblow technology in cold heading steel

YU Xin-he;WANG Jin-ping;ZHAO Ji-yu;CHEN Gang

2007, 23(05): 5-8. doi:

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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.

Practice in production of extralow carbon steel by RH treatment

ZHANG Zong-ning;YUE Ke-xiang

2007, 23(05): 9-12. doi:

Asbtract ( 1808 )

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According to the low carbon steel production data acquired in the practical production in Ma'anshan Iron & Steel Works from January to June 2006 the RH circulation flow and circulation coefficient are calculated and their effects on end point carbon content analyzed as well. Analytical results show that final w(C) shall be less than 0.005 %, circulation factor greater than 4 and the minimum treatment time 13.32 minutes. In the meanwhile it's found out that the modified slag of LD,RHKTB is in possession of certain desulphurizing capacity.

Optimization of oxygen lance nozzle for BOF

GAO Wen-fang;ZHANG Jian-jun;CHEN Gang;YI Wei-don;LI Qiang;ZOU Zong-shu

2007, 23(05): 13-17. doi:

Asbtract ( 1809 )

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The present paper describes the parameter design, water model test and production test of the oxygen lance nozzle for the 125 t topbottom combined blown converter. Results show that the oxygen supply capacity for the optimized 5hole oxygen lance is prominently increased and the oxygen blowing process goes on smoothly with fast formation of slag and less splashing. Therefore the optimized lance nozzle can basically meet requirements of the refining operation after the volume expansion of the converter.

Study on variation of oxygen content in LD→LF→CC process

ZANG Xiao-jun;PAN Xue-jun;ZHU Li-yun

2007, 23(05): 18-20，3. doi:

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The law of variation of oxygen content in LD→LF→CC process in Linfen Steel Works has been studied. By way of sampling and analyzing the nitrogen and oxygen specimen and by metallographic observation and analysis on the inclusions extracted by electrolysis the general level of the oxygen content in steel in the abovementioned process has been determined and the major factors affecting further improvement in the hot metal quality found out and recommendations for improvement put forward.

Analysis and study on central crack in continuously rolled billets of low alloy steel

LEI Hong-bo;XU Gang;XUE Jun;GUO Chun-yuan;YE Yin-peng;MA Cheng;CAO Wei-hua;NING Dong

2007, 23(05): 21-23，4. doi:

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The present paper introduces the production technologies of the continuously rolled billets of low alloy steel and the examination method of their internal quality, analyzes the central cracks in the continuously rolled billets and determines the primary defect of the billets (that is central crack) and finds out the primary cause leading to the central crack and thereupon puts forward the measures to check and reduce the central crack and then carries out a series of production tests to examine those measures. Experimental results show that by taking those measures and methods the central cracks in the billets can be effectively checked and reduced.

Study on characteristics of liquid core reduction process in TSCR

SU Liang;TIAN Nai-yuan

2007, 23(05): 24-26. doi:

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The present paper briefly introduces the liquid core reduction process during thin slab continuously casting and compares the technique of liquid core reduction with that of soft reduction. In light of the technological characteristics of the liquid core reduction process for the thin slab continuous casting it also analyzes the structure of the continuous casting machine in which the new process is adopted and reaches the conclusion that appropriate process prerequisites for the liquid core reduction technique in thin slab CC are of great significance for application of this technology.

Study on quality control of high grade hull structure steel

LIU Dan-mei;BAO Yan-ping;YUE Feng;XIAO Da-heng;CHEN Qi-ming

2007, 23(05): 27-31. doi:

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In order to satisfy the requirements of Egrade hull plate for high quality slab a series of technical measures such as deep desulphurization by hot metal pretreatment, deoxidation and desulphurization by ladle refining and modification of inclusions by feeding Caclad wire into the ladle furnace have been taken to improve the cleanliness of the hot metal and raise toughness of the high grade hull plate. It's found out in the experiments that the toughness of the Egrade steel can be raised prominently providing that w(S) is controlled within the limit of less than 0.005% and the modification of inclusions can be accomplished so long as w(Al) is defined in the range of 0.03% to 0.04% and ratio of m(Ca)/m(Al) is controlled in about 0.1. Production results show that by way of control of sulphur and oxygen contents in a very low level and adoption of Ca treatment process the cleanliness of the hot metal and the quality of the Egrade hull plate can be ensured as the strength and toughness of the steel are raised.

Mathematical simulation of cake shape in spray forming process

LI Xiao-hong;REN San-bing;LE Hai-rong;FAN Jun-fei

2007, 23(05): 32-36. doi:

Asbtract ( 1923 )

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A 3dimension model depicting the dynamic growth of the geometrical outline of a cake slab in the process of spray forming has been built up. The influence of various processing parameters such as atomization characteristic value of the nozzle, eccentric distance, rotation speed and withdraw speed of the substrate in the process of spray forming have been fully considered in building up the model. By data processing after calculation a 3dimensional profile of the growth of a cake slab has been obtained. By comparison of the above mentioned profile with that of the cake slab produced by the physical spray forming equipment it's proved that the two different profiles are in perfect agreement with each other and therefore the newly developed model can very effectively predict the outline growth of the cake slab in various processing conditions.

Analysis on structure and mechanical property of spray forming cake slab

WANG Ai-min;ZHANG Yin;HE You-duo;WANG Yong-bin

2007, 23(05): 37-40. doi:

Asbtract ( 2012 )

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Spray forming is a kind of fast developing and brand new metal and alloy forming technology. This technology is not only in possession of the advantage of fast solidification, but it also can produce low segregated, fine grained, high density and nearnet shape cake slab with simplified process. Therefore the production cost of the cake slab produced by this technology can be dramatically reduced in comparison with that produced by the traditional powder metallurgical technology. The structure and grain size distribution of the GCr15 cake slab produced by the spray forming technology have been examined and analyzed by optical microscope and SEM. In the meanwhile the density and hardness of the cake slab have also been measured and analyzed. Results show that the structure of spray formed cake slab consists primarily of the isometric crystal and the distribution of its chemical compositions is relatively homogeneous. On the basis of the understanding proper measures to improve the microstructures and properties of the cake slab have been accordingly put forward.

Development and application of regenerative roaster for ladle preheating

GAO Jing-chao

2007, 23(05): 41-44. doi:

Asbtract ( 1943 )

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In the present paper the working principle and characteristics of the regenerative roaster as well as application of this technology in 150 t steel ladle in Jigang have been introduced. In examining the conditions of the ladle lining roasted by various type of roasters the temperature rising curve of the ladle shell and the preheating temperature of the medium attained have been measured. Through examination of the actual results it's determined that by application of the regenerative roasting technology in baking the refractory material of the ladle the roasting time can be reduced and the desirable lining temperature of the ladle obtained as well. In the meanwhile the energy consumption can be lowered down and working environment in the steelmaking plant improved.

Development and application of computer simulation software for

HAN Zhi-wei;FENG Ke;WANG Yong;MAO Jin-hua

2007, 23(05): 45-48. doi:

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Based on the structural characteristics of the billet continuous caster and the concept of finite thin section moving along the drawing direction a mathematical model of heat transfer in the process of CC billet solidification has been erected and the general simulation software for secondary cooling of the billet CC developed by Visual Basic 6.0. In the newly developed software are integrated the simulation and calculation of the temperature field and solidification of the continuous casting process, con algorithm for the water table of secondary cooling zones, regression of formula of the flow capacity and cast speed, input and output data processing and graphic processing. This software is featured of convenience in use and multifunctions, and therefore shows a very broad prospect of application in the research of the secondary cooling technology, CC production and engineering design.

Application of numerical simulation in project engineering of

FENG Ke;HAN Zhi-wei;WANG yong;MAO Jin-hua

2007, 23(05): 49-52. doi:

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In the project engineering of slab continuous caster, the numerical simulation technique (slab continuous casting process static simulationbased software CCPS OFFLINE) has been used to optimize the water flow rate in the secondary cooling zones and theoretically predict the relevant important process/structural parameters such as the mould taper, segment gap and slab strain distribution. Certain positive results have already been put into practice in a specific steelmaking plant and very satisfactory achievements have been achieved and those achievements have been fully utilized in later new slab continuous caster project engineering.

Practices in improvement of CC thin slab steel quality

LU Sheng-yi

2007, 23(05): 53-57. doi:

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The present paper introduces a few operating practices in regard to improvement in the CC thin slab quality such as elimination of the surface longitudinal and traversal cracks in the thin slab, reduction of the SEN clogging tendency, decrease of N content in steel and appropriate choice of mould flux.

Technological measures for increaseing the speed in slab continuous casting

CAI Ning; DU Feng

2007, 23(05): 58-62. doi:

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The present paper introduces the evolution history and status quo of the high speed slab continuous casting technology at home and abroad and reviews the technical measures adopted such as mold flux, mold oscillation pattern, control on the fluctuation of the liquid level of the nozzle and mold, electromagnetic stirring and large volume tundish and puts forward suggestions for increase in the drawing speed.

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