钢铁钒钛

Anatase TiO₂ Nanoparticles Synthesized Using the Hydrothermal Method and its Character

Fu Xiaoming, Xu Yan, Yang Zaizhi, Liu Zhaowen

2011, 32(2): 1-4.

Abstract(29) PDF(1)

Abstract:
Anatase TiO₂ nanoparticles are synthesized with Ti(SO₄)₂ as titanium source and stronger ammonia water as precipitant using the hydrothernal method.The samples are characterized by XRD,SEM and TEM.The results showed that the change of size of anatase TiO₂ particles is not obvious with increase of the reaction time when stronger ammonia water is not joined Ti(SO₄)₂ solution.Anatase TiO₂ particles become small markedly under the same conditions when stronger ammonia water is joined Ti(SO₄)₂ solution.Anatase TiO₂ particles of about 20 nm are obtained with pH=9.0 at 240℃for 48.0 h by the hydrothernal method.The samples are characterized with UV-VIS.The decrease of TiO₂ particles is propitious to the blue shift of the absorption peak of TiO₂.

Solvent Extraction of Titanium by N1923-isopentanol from Chloride Media of Different Concentration

Mao Xuehua, Liu Daijun, Zhang Peng

2011, 32(2): 5-9.

Abstract(23) PDF(2)

Abstract:
Solvent extraction of titanium by N1923-isopentanol from chloride media of different concentration was investigated.The effects of the concentration of HCl,pre-acidification,the concentration of isopentanol,the reaction temperature,the reaction time,O/A and the diluent were studied.It is showed that the percentage of extraction of titanium by N1923 increases steadily with increasing the concentration of HCl up to 8 mol/L,however increases sharply when the concentration of HCl is more than 8 mol/L.The percentage extraction of titanium by N1923-isopentanol is more than 90% with synergistic extraction.But it is poor for the separation of titanium and iron.

The Latest Developments of Integrated Utilization on Panzhihua High Titanium-bearing BF Slag

Li Xinghua, Pu Jiangtao

2011, 32(2): 10-14.

Abstract(27) PDF(1)

Abstract:
The latest research on Panzhihua high titanium-bearing BF slag as "selective enrichment and separation after metallurgic modified","preparation of TiCl₄ by high temperature carbonization and low temperature selective chlorination","preparation of Ti-Si alloy by plasma smelting reduction","directmineral separation of titanium",and "preparation of new mineral wool" were presented.The difficulties were analysed and the prospects were forecasted.Proposed an ideal mode for this research is diversification of technology and products.

Extracting the Scandium from the Chlorine Slagging

Li Liang

2011, 32(2): 15-19.

Abstract(21) PDF(1)

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Selecting the chlorine slagging after concentration as a raw material,the influence of the leaching sour type,raw material granularity,the leaching acid concentration,the leaching liquid solid mass ratio,the leaching temperature and the extraction time on the scandium leaching rate have been studied.The condition experiment and orthogonal test indicate that the superior experiment condition is:the leaching sour is the sulfuric acid;the leaching acid concentration is 40%;the granularity of the raw material is 44μm(325 items);the leaching liquid solid mass ratio is 3.5;the leaching temperature is 70℃;the extraction time is 8 h.The leaching temperature,leaching liquid solid mass ratio and leaching acid concentration to the leaching rate influence size in turn are:The leaching temperature is more than the leaching liquid solid mass ratio,and the later is more than the leaching acid concentration.The stability test indicated:The scandium leaching rate may reach above 95%,and it creates the advantage to carry on the scandium recycling.

Influence of Cooling Intension on Microstructure and Content of f-CaO in Steel Slag

Zhang Yuzhu, Lei Yunbo, Li Junguo, Xing Hongwei, Han Zhijie, Long Yue

2011, 32(2): 20-24.

Abstract(16) PDF(1)

Abstract:
The microstructure and content of f-CaO in slow cooling slag,gas quenching slag and hot closed treatment slag have been investigated through SEM and chemical analysis.The dispersed f-CaO in steel slag was mainly formed during the process of primary crystallization of C₂S and C₃S,formation of RO phase and decomposition of C₃S.Generally speaking,the quantity of dispersed f-CaO with smaller grain size was large,and its distribution was widely.The typical microstructure of f-CaO in slow cooling slag was gray spherical,thin film or strip shape.Dispersed f-CaO in gas quenching slag was gray thin film and strip shape,while which in hot closed treatment slag was strip shape.Cooling intension has significant influence on f-CaO content in steel slag.The f-CaO content in slow cooling slag undergone lower cooling intension was the highest and was 6.96%.The f-CaO content in hot closed treatment slag with higher cooling intension and hydrolysis was only 0.55%.While the f-CaO content in gas quenching slag was 2.28%.The f-CaO content in gas quenching steel slag decreased with the decline of particle size.Consequently,the comprehensive utilization of gas quenching steel slag could be improved through declining particle size of the solid slag.

Finite Element Modeling of Steady Temperature Field of Molten-Salt Chlorinator

Ju Dianchun, Chen Zhiyong, Qing Yang, Yan Dingliu, Li Xiangyang

2011, 32(2): 25-28.

Abstract(26) PDF(1)

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The heat transfer characteristics of No.1 molten-salt chlorinator of Jinzhou Titanium Co.,Ltd.was analyzed,and a finite element model of steady temperature field of molten-salt chlorinator with ANSYS software was established.The results showed molten-salt chlorinator shell temperature was at 30~50℃,the maximum temperature of molten salt reached to 747℃,and these were similar to field measured data.The heat flux and temperature gradient of molten-salt chlorinator proved that the effect of wall on steady temperature field was very limited,and spraying slurry containing titanium tetrachloride was the biggest factor.So some measures to solve the problem of high temperature molten salt were put forward.

Temperature Characteristics of Dephosphorization of Steelmaking Slag in Microwave Heating Process

Ai Liqun, Zhou Chaogang, Lü Yan, Hou Peng

2011, 32(2): 29-32.

Abstract(23) PDF(1)

Abstract:
The steelmaking slag dephosphorization experiments were carried out by microwave heating and carbon thermal reduction methods.The temperature characteristics of steelmaking slag were researched under the condition of the laboratory.The experiment results indicated that different steelmaking slag used have well temperature elevation characteristics and preferable dephosphorization results.According to the results,process parameters are discussed and determined.

Study on Mechanical Energy Aided Aluminizing of Precipitation Hardening Stainless Steel

Zhu Wangwei, Yin Tiezhi, Wang Xiangdong, Li Jian, Chen Xiaoping, Mi Fengyi, Zhu Zhibing

2011, 32(2): 33-38.

Abstract(16) PDF(1)

Abstract:
Precipitation hardening stainless steel has been aluminized in the low temperature by the process of mechanical energy aided aluminizing.This technique produce layers with thickness of 11μm and appear to be homogeneous for 10 h treatment at 500℃,base on keeping the mechanical properties of matrix material unchanged.The aluminized layer is researched by using SEM、EDS、micro-hardness analysis and salt spray.The layers appear to be aluminum-rich phase,and have excellent resistance to corrosion and middle temperature oxidation,also,the micro-hardness of aluminized layer is more than two times than that of matrix material.The process of mechanical energy aided aluminizing is deep discussed from aluminizing reaction mechanism.

Trial Production of High Chromium Tube Steel by Convert-bloom Continuous Casting Process

Chen Tianming, Chen Yong, Deng Jun, Yang Senxiang, Chen Liang, Li Qingchun, Ceng Jianhua

2011, 32(2): 39-42.

Abstract(13) PDF(1)

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In consideration of the composition characteristics and quality requirements of L80-3Cr high chromium steel,the rational alloying system,temperature system and key technologies of continuous casting process are employed in the development of a full-line operation of LD-LF-RH-Bloom continuous casting on steelmaking with semi-steel,which suggests an economic production of the steel has been realized.The industrial tests show that the average recovery rate of Cr in smelting process is 98.2%,and Cr content in final products is consistent.The T[O] content of rolled products is ranged from 10×10^-6 to 16×10^-6 with an average content of 13.5×10^-6.Various inclusions of the products are no more than 1.0 level.The rolled products have good surface quality and internal quality.

Study on Recrystallization Temperature of Ti Microalloyed High Strength Steel in Cold-Rolled Strips

Lü Shengxia, Chen Shi, Mao Xinping, Wang Xi, Zhu Dayan, Huo Xiangdong

2011, 32(2): 43-47.

Abstract(20) PDF(1)

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The recrystallization temperature of Ti microalloyed high strength steel in cold rolling were investigated by means of microhardness testing,metallographic structure observation and isothermal annealing for half an hour.The results shown that the regulations of recrystallization were basically the same in the different percentage of cold-rolling reduction steels,and the recrystallization temperature of steel had a little drop trend with the percentage of cold-rolling reduction increasing.The process was defined recovery at temperatures below 640℃,a large number of equiaxed grains nucleated,and the microhardness rapidly reduced with temperature increasing.Recrystallization grains grow up abnormally when the temperature rose to 840℃.The recrystallization temperature of steel rose to 700~710℃,large amount of nanometer TiC particles and solute atoms existed in steel were main reasons for the high recrystallization temperature.

Determination of Optimal Recrystallization Annealing Temperature of Nb-Ti Microalloying High Strength IF Steel

Wang Minli

2011, 32(2): 48-52.

Abstract(35) PDF(1)

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The Nb-Ti microalloying high strength IF steel sheet was used to study the effect of annealing temperature on the microstructures,mechanical property and textures.The experimental results showed that experimental steel was incomplete recrystallization when annealing temperature is 750℃,and the recrystallization has finished when annealing temperature was from 780℃ to 870℃ under experimental condition.With the increasing of annealing temperature,the yield strength and tensile strength gradually reduced,and the the plastic strain ratio and yield point elongation gradually increased.The yield strength,tensile strength,elongation percentage,the plastic strain ratio and the strain hardening exponent were approximate 300 MPa,410 MPa,36.5%,1.7 and 0.22 under annealing temperature 810℃ to 840℃.When the annealing temperature was increased,the α textures and γ textures were gradually weakened,and the α textures have a trend of close to texture {111}.Therefore,the suggested optimal recrystallization annealing temperature of industrial production is 810℃ to 840℃.

Corrosion Mechanism of MgO-C Refractory by Converter Vanadium Recover-slag

Wang Guangen, Wang Yu, Xie Bing, Li Xinsheng, Guo Xu, Li Xiaojun

2011, 32(2): 53-57.

Abstract(23) PDF(1)

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To research the influence of the oxides in converter vanadium recover-slags on the corrosion behavior of MgO-C bricks,the samples of MgO-C bricks were immersed in converter vanadium recover-slags with different levels of V₂O₃、FeO、TiO₂、MnO、MgO at converter vanadium recover temperature,the relation between the content of oxides and corrosion rate of the MgO-C bricks were gained.The investigation of the worn samples microstructures and the composition of the phase revealed the presence of Fe particles,which was deoxidized by graphite,at the interface by using SEM-EDS,and the discussion of corrosion of MgO-C bricks was made according to experiment consequence.

Optimization of 150 tons Vanadium Extraction Oxygen Converter's Flow Field

Tang Wendan, Li Jingshe, Chen Yongfeng, Tian Dongfang

2011, 32(2): 58-62.

Abstract(17) PDF(2)

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The effect of the lance level,the flow rate of top lance,the flow rate of bottom blowing and the bottom tuyeres' configuration on mixing time of fluid in 150 t vanadium extraction converter has been studied and optimized by water model experiment with similarity ratio 1:6.The best blowing case is that lance level is 183.3 mm,flow rate of top lance is 85.6 m³/h and flow rate of bottom blowing is 1.05 m³/h.The best bottom tuyeres configuration is case 2,eight bottom tuyeres are divided into two groups and fixed on the two rings of converter bottom,the diameters of the rings are 0.4D and 0.6D;the four adjacent bottom tuyeres are arrayed rhombic.

Choice and Optimization of EMS Parameters of Thin Mold

Guo Hao, Jin Yonglong, Wu Feipeng, Guo Xiangjun

2011, 32(2): 63-68.

Abstract(18) PDF(1)

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EMS technology for the thin mold has been developed,the metallurgical characteristics and the corresponding actual results of electromagnetic stirring have been measured to select specific economic and reliable process parameters.Compared the optimized internal quality effects of the slab with or without EMS,the results shows that according to the choice and optimization of process parameters to the electromagnetic stirring,central axis slab with increased equiaxed zone and improved internal quality have been produced.There is an increase of 50.5 mm on wide face on average,and the linear rate is 41%;There is an increase of 94.5 mm on narrow face on average,and the linear rate is 59%.The average level of centre crack is 0.17.The average level of middle-level crack is 0.17.The liquid core length of slab shortens 2.61 m.

Production Technology Development for Low-carbon Bainitic Steel CW590L

Feng Shaoqiang, Huang Bin, Luo Youyuan, Shang Chengjia

2011, 32(2): 69-73.

Abstract(33) PDF(2)

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Through the cooperation with technology institutions,the development of low-carbon bainitic steel 590L grade is studied in the laboratory.The main work is composition design and CCT curve test of steel.According to the laboratory research results and combined with the 950 production line situation of Chuanwei,the industrial production plan of CW590L micro-alloy steel is optimized and practice is successfully put forward.The detection of microstructure and properties of the over 10 000 tons micro-alloy steel product shows that the average yield strength is 505 MPa,the average tensile strength is 630 MPa,the average elongation is 27% and the cold bending(d=1a) is completely qualified.The microstructure and properties fully satisfy the needs of the clients.

Effects of Soft Blowing Time on Behavior of Nonmetallic Inclusions after Calcium Treatment in X80 Pipeline Steel

Li Qiang, Wang Jian, Wang Xinhua, Li Haibo, Qu Honghui, Jiang Min, Wang Wanjun, Zhu Guosen

2011, 32(2): 74-78.

Abstract(30) PDF(2)

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In the present work,effects of soft blowing with argon after RH treatment on inclusion properties for pipeline steel X80 were investigated.The results showed that the total oxygen content could be significantly reduced after 25 minutes' blowing.The inclusions of above 6 μm in size were almost completely removed after 25 minutes of soft blowing.The number of inclusions of 1~5 μm in size could be obviously reduced with the increase of the time of soft blowing.However,CaS type inclusions would increase with the decrease of temperature of molten steel during the soft blowing,which was bad for casting.Considering the results of the decrease of inclusion magnitude and the effects on the temperature of the molten steel,the best of soft blowing time was 20~25 minutes.

Research for Control of Sulphur Content in Smelting Process of Electrical Steel

Qing Jiasheng, Yuan Hongwei, Yang Senxiang, Li Jianquan, Li Qingchun, Huang Denghua

2011, 32(2): 79-83.

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The resulfurization and the change of sulphur content in production of electrical steel is analyzed.The targeted measures have been taken,such as increase the loaded quantity of liquid iron,quartz sand replaces the composite slagging agent in the converter and RH desulfurization to decrease the sulphur content of the steel.The result shows,after the measures have been taken,the finished product ratio of electrical steel increase a lot.The ratio of sulfur content of finished product no more than 0.008% increased to 92.4% from 62%,the metallurgical effect was obvious obtained.

2011, 32(2): 84-86.

Abstract(24) PDF(1)

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2011 Vol. 32, No. 2