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	2007 Vol. 42 No. 4
	Published: 2007-04-15

综合论述

	1	YANG Lihong;ZHANG Jian;FU Jianqin;CUI Jian
		Present Status and Prospect of Vacuum Strip Coating Processes
		The application and features of vaccum strip coating processes such as thermal jet evaporation, magnetron sputtering, electronbeam evaporation and plasma enhanced EB evaporation process were reviewed.This technology is walking towards mass production and has been realized in pilot lines at many steelmakers. The main advantages of vacuum strip coating processes are environmentfriendly, excellent film properties, versatile film material and easiness to integrate with other processes. The potential products would be surface modified current products, coatings for critical working conditions, interfacial layer, functional and composite coatings. The main problem for industrialization lies in the products and market orientation.
		2007 Vol. 42 (4): 1-0 [Abstract] ( 2640 ) [HTML 0KB] [PDF 0KB] ( 114 )

原料与炼铁

	5	CUI Ping;ZHANG Lei;YANG Min;KANG Shigang
		Research on Influence of Boric Acid Composite Agent on Coke Reactivity and Acting Mechanism
		Boric acid composite agent was sprayed on hot coke and the effects on coke reactivity, shielding from alkali and resistance to erosion of alkali were studied.The composition and morphology of coke surface after spray was analyzed using EDS and XPS. The results showed that the decomposition of boric acid happens on coke surface and B2O3 is produced covering on the surface of coke pores to prevent coke from contact with CO2.Boric acid decreases coke reactivity, shielding the coke from alkali and increases resistance to erosion of alkali. The degree of influence increases with boric acid concentration.
		2007 Vol. 42 (4): 5-0 [Abstract] ( 2645 ) [HTML 0KB] [PDF 0KB] ( 102 )

	8	ZHANG Hanquan;YU Yongfu;CHEN Wen
		Study on Thermodymatics of Magnetic Roasting of Magnetic Separated Concentrates at Daye Mine
		Magnetic roasting followed by magnetic separation is a complex technique for beneficiation of tailing with high siderite at Daye Mine.Thermodynamic conditions of magnetic roasting are analyzed.The experiment results show that by CO dessociated from siderite and weak reducing atmosphere formed, low grade hematite with siderite could be reduced to magnetite totally within 10 to 60 seconds. By the wet magnetic separation at low intensity, the reduced ore is easily separated, and quality of concentrate is enhanced (w(TFe)＞60%).
		2007 Vol. 42 (4): 8-0 [Abstract] ( 2595 ) [HTML 0KB] [PDF 0KB] ( 97 )

	12	L Xuewei;BAI Chenguang;QIU Guibao;OUYANG Qi;HUANG Yuming
		Research on Sintering Burdening Optimization Based on Genetic Algorithm
		A burdening optimization model for sintering based on GA (Genetic Algorithm) and stepwise regression, was established and proved at Chongqing Iron and Steel Co., Ltd. The results indicated that chemical composition and physical properties of sinters meet the requirements of production, the cost of sinters was decreased by 14.7 RMB/t. The problems in burdening that could not be solved with LP (Linear Programming) or other algorithms can be solved with GA.
		2007 Vol. 42 (4): 12-0 [Abstract] ( 2897 ) [HTML 0KB] [PDF 0KB] ( 127 )

	16	XU Haichuan;QI Yuanhong
		Simulation Analysis of Shaft Production of HBI With COREX Offgas
		The COREX process for hot metal has been known as an advanced technology due to the use of noncoke coal which can shorten the production route, greatly lighten pollution of iron making process, and offgas can be used for production of HBI. The offgas output of COREX 2000 can meet the need of producing 0.8 Mt/a HBI.The energy consumption of shaft production of HBI using COREX offgas,is analysed with presentation of suitable reduction conditions and influencing factors.
		2007 Vol. 42 (4): 16-0 [Abstract] ( 2758 ) [HTML 0KB] [PDF 0KB] ( 82 )

炼钢

	21	TANG Haiyan;LI Jingshe;WANG Jianbin;SUN Kaiming;WEN Desong;
		Study on Removal of Inclusions From Molten Steel by Blowing During LF Refining
		Based on the water model experimental results, 150 t ladle argon blowing process at No.1 Steelmaking Plant, Tianjin Pipe Corporation Ltd. was improved. Analytical techniques such as tracers, metallographic examination, electrolysis, SEM and EDS were applied to compare the effect of inclusion removal for casing steel treated by two different argon blowing processes during LF refining. The results show that the reduction rate of total oxygen,with microinclusions and largesized inclusions was 35.42%, 59.85% and 93.43% respectively after ladle refining before improvement.The corresponding values of improved process were 44.31%, 64.29% and 95.88%.
		2007 Vol. 42 (4): 21-0 [Abstract] ( 2686 ) [HTML 0KB] [PDF 0KB] ( 111 )

	24	SHI Zhiji;WANG Guocai;LI Yingjiang
		Gas Analysis in Converter Dynamic Control Technology and Its Application at Masteel
		The objects and significance of automatic control in steelmaking and gas analysis in converter dynamic control are introduced.The compostion and principles of gas analysis in converter dynamic control are introduced with results in application at Masteel for lime consumption and splashing reduction and end point control.The influencing factors and existing problems are pointed out with countermeasures.In addition, the experience of using this technique on medium converters are summarized.
		2007 Vol. 42 (4): 24-0 [Abstract] ( 2920 ) [HTML 0KB] [PDF 0KB] ( 104 )

	27	JIANG Guozhang;KONG Jianyi;LI Gongfa;LIU Yaolin
		Simulation Research on Temperature Distribution in Tundish
		A finite element model was built to describe the temperature field in the tundish by using of turbulence theory.The application of FEM to simulation of temperature field in the tundish and description of temperature distribution in the tundish was presented. The results indicate that the flow of molten steel in tundish in many cases is under nonisothermal condition, and the temperature distribution pattern of molten steel is different. The temperature distribution in modified tundish is homogeneous and such tundish is useful to enhance the quality of continuou cast slab.
		2007 Vol. 42 (4): 27-0 [Abstract] ( 5076 ) [HTML 0KB] [PDF 0KB] ( 122 )

	30	WANG Deyong;MIN Yi;LIU Chengjun;JIANG Maofa
		Research on Inclusion Behavior During LF Refining for Pipeline Steel
		Effect of argon blowing and the second refining on inclusion removal in pipeline steel were investigated. The results showed that,the total oxygen removal rate of LF refining is about 20%, and N content is increased slightly.The area ratio of inclusion is decreased by 40%50% during LF refining.After LF refining the fraction of inclusions of 25 μm in size is increased from 40%50% to 80%90%, but the size of large inclusions is not changed obviously.
		2007 Vol. 42 (4): 30-0 [Abstract] ( 2573 ) [HTML 0KB] [PDF 0KB] ( 103 )

	34	WANG Guangya;LIU Minghua
		Industrial Experiment of Continuous Temperature Measurement of Molten Steel in CC Tundish by Infrared Ray
		The results of industrial experiment of continuous temperature measurement system for molten steel in CC tundish, by infrared ray that is based on the principle of color contrast, are described. The principles and specifics of different infrared measuring systerms are analyzed. The erosionresistance and heat shock resistance tests of high conductivity ceramic tube for temperature measuring are reported. The effects of temperature, pressure and flux of cooling gas on the cooling of temperature measuring gun are also reported. The accuracy and stability of measurement, the reliability of equipment and the response time of temperature are analyzed. Comparing with the measurement with PtPtRh thermocouple, the advantages and disadvantages of continuous infrared temperature measurement system based on color contrast are analyzed.
		2007 Vol. 42 (4): 34-0 [Abstract] ( 2650 ) [HTML 0KB] [PDF 0KB] ( 85 )

压力加工

	38	LI Xingdong;SUN Dale;YANG Lipo;LIU Hongmin
		Shape GrindingOriented Thermal Deformation Research of Work Roll of Hot Strip Rolling Mill
		For hot strip rolling mill the work rolls are ground at warm after rolling. The shape of ground cooled work rolls is difficult to reach the set value because of the remaining uneven thermal deformation.Due to difficulties of measurement,a reasonable physical measurement method was established, and the temperature distribution and thermal roll shape of work roll after rolling can be accurately measured. The complicated heat transfer boundary conditions of work roll were taken into account and the numerical simulation was made with finite difference analysis to determine the temperature field and thermal deformation of work rolls cooled in the air. The computed and measured results coincided satisfactorily. The thermal deformation of work roll at different time after rolling should be simulated and the shape of groumd roll can be set by the superposition of target roll shape before rolling and the thermal roll shape at grinding,in this way a basis and computation method for appropriate roll shape grinding are provided.
		2007 Vol. 42 (4): 38-0 [Abstract] ( 2670 ) [HTML 0KB] [PDF 0KB] ( 99 )

	42	LIU Guoyong;ZHANG Shaojun;LI Mouwei;WANG Bangwen
		Analysis on Influencing Factors of Plate Deformation During Quenching
		The stressstrain field and the stressstrain characteristics of plate during quenching was computed numerically by ANSYS 3D thermoelasticplastic finite element.The analysis of deformation of plate during cooling was studied numerically and experimentally, and quantitative analysis on the factors including the jet impinging mode (high pressure impinging and normal pressure pipe impinging), water ratio of upper and lower jet ,lengthways distance between jets (or distance between rollers) and the running speed of steel plate (roller table speed) was performed, which provides theoretical basis for keeping favorable plate profile in quenching.
		2007 Vol. 42 (4): 42-0 [Abstract] ( 2346 ) [HTML 0KB] [PDF 0KB] ( 71 )

	46	WEI Gangcheng;ZHANG Qingdong;CHEN Xianlin
		Improvement on Shape Control Performance on Finishing Train of 2250 mm Hot Steel Strip Mill
		For 2250 mm hot continuous rolling mill,the investigation was carried out to study on the work roll end contact during rolling at last stand using Finite Element Method(FEM),Roll contact deteriorates shape controling performance.The influence of strip specification and rolling force on roll contact was obtained by calculation, and negative effect of roll contact on shape controling performance was also revealed. By comparative study, varying contactlength backup roll(VCR) as a technical countermeasure was proposed and, good effect was obtained in production.
		2007 Vol. 42 (4): 46-0 [Abstract] ( 2882 ) [HTML 0KB] [PDF 0KB] ( 105 )

	50	HU Xianlei;ZHAO Zhong;LIU Xianghua;ZHANG Qingchun
		Analysis of Oversize in Thickness of Plate at Head and Tail Ends
		For plate rolling mill, the influence of slab temperature, head end immersion at biting,use of AGC system, pressure sensor and broadening ratio on oversize in thickness of plate at head and tail ends is analyzed.Low temperature at plate head and tail ends greatly affects the oversige in thickness, because not only of increased plasticity coefficient, but of genetic effect of this influence. The influence of head immersion at biting on thickness of head and tail ends can be removed by immersion compensation. The influence of biting without AGC can be partly reduced by slowing the biting speed. If broadening ratio is too low, the thickness at head and tail ends would be increased,and the thickness would reduced if this ratis is too high. The results afford theoretical base for gauge control at head and tail ends and were proved by practice.
		2007 Vol. 42 (4): 50-0 [Abstract] ( 2782 ) [HTML 0KB] [PDF 0KB] ( 110 )

钢铁材料

	53	LIU Qingyou;YANG Xiaojun;MAO Xinping;LIN Zhenyuan;ZHANG Liwen
		Second Phase Analysis of VN Ｍicroalloy Steel Produced by EAFCSP
		The VN microalloy steel with yield strength of 550 MPa is produced by EAFCSP route. However, based on the thermodynamics, there are different opinious regarding the analysis of V(C,N) particles in the waterquenched continuously cast slab.The physicochemical phase analysis，SEM and TEM analysis were used to observe the precipitates during EAFCSP process.The effect of Ti and Al on the precipitation of V(C,N) is discussed by use of ThermoCalc software.
		2007 Vol. 42 (4): 53-0 [Abstract] ( 2642 ) [HTML 0KB] [PDF 0KB] ( 98 )

	57	YANG Caifu;SU Hang;LI Li;ZHANG Yongquan
		Enrichment of Cu,Ni in Surface Oxidation Layer of CopperBearing AgeHardening Steel
		Enrichment of Cu,Ni in surface oxidation layer of copperbearing agehardening steel was investigated. The results showed that copper enriched liquid phase is formed at reheating temperature of 1100~1200 ℃, and the liquid Cu enriched phase is penetrated along austenite grain boundary leading to surface cracking. But copper enriched liquid phase is not formed at reheating temperature of 1000 ℃ and 1300 ℃. The structure of copperrich phase in scale is changed by addition of nickel, and NiCu enriched phase is stayed in oxidized layer in form of granular particle which inhibits copper enriched phase from penetration into the base metal.
		2007 Vol. 42 (4): 57-0 [Abstract] ( 2501 ) [HTML 0KB] [PDF 0KB] ( 77 )

	61	JIANG Bo;CHEN Gang;CUI Yinhui;REN Xuechong;CHU Wuyang
		Research of Flaking in Wheel Steel （Ⅰ）
		The mechanism of flaking in wheel steel and the effects of flaking on fracture were investigated. The results show that a blisters nucleate and grow through diffusion and gathering of hydrogen atoms and vacancies when the hydrogen pressure is increased, microcracks initiate at the wall of the blister,and propagate which results in formation of flaking. The fracture with flaking is quasicleavage, similar to that of hydrogeninduced delayed cracking. The fracture morphology of the sample containing flaking is dependent upon the failure mode and the thickness of the sample. There is no effect of flaking on fracture surface morphology besides secondary cracks and local quasicleavage fracture.
		2007 Vol. 42 (4): 61-0 [Abstract] ( 2735 ) [HTML 0KB] [PDF 0KB] ( 105 )

	67	KANG Yonglin;JING Qinguang;WU Guangliang;WEN Dezhi;ZHOU Chunquan
		Influence of Coiling Temperature and Total Cold Rolling Reduction Rate on Mechanical Properties of BContaining 08A1 Steel
		Bcontaining((40～60)×106,mass fraction) and Bfree 08Al hot strips produced by CSP process were used for experiment. The hot strips were coiled at different temperatures and then cold rolled with different reduction rate. After recrystallization annealing, the formability(rvalue and nvalue) and mechanical properties (YS，TS and A) were measured by tensile tests, in addition, two kinds of annealed sheets (coiling temperature 620 ℃;75% reduction) were analyzed by Xray diffraction(ODF) and electron backscattered diffraction (EBSD). The results showed that coiling temperature and total coldrolling reduction rate have remarkable influence on the formability and mechanical properties of Bcontaining and Bfree 08A1 steels after recrystallization annealing.ODF EBSD tests showed that the fraction of γfiber texture in Bcontaining steel is lower than that in Bfree steel, nevertheless, the rotating cubic texture ({001} <110>) and Goss texture ({011} <100>) are much more than that in Bfree steel.
		2007 Vol. 42 (4): 67-0 [Abstract] ( 3207 ) [HTML 0KB] [PDF 0KB] ( 105 )

	73	XIAO Guizhi;DI Hongshuang;JIA Xuejun
		Effect of Heat Treatment on Mechanical Properties of 30MnSi PC Steel Bar
		Focusing on some problems of 30MnSi prestressed concrete (PC) steel bars such as poor delayed fracture resistance， mechanical property instability， high yield ratio and so on， the tempered sorbite should be obtained by thermal refining to solve these problems and achieve excellent mechanical properties. The relationship between heat treatment parameters and tensile strength,elongation,yield ratio was obtained respectively. The effect of heat treatment parameters on microstructure， strength and ductility of the 30MnSi PC steel bars was investigated and analyzed systematically. Optimum strength and plasticity can be obtained by quenching at 920960 ℃ and tempering in the range of 390430 ℃ with constant heating time.
		2007 Vol. 42 (4): 73-0 [Abstract] ( 3493 ) [HTML 0KB] [PDF 0KB] ( 121 )

环保与能源

	78	WU Fuzhong;CAI Jiuju;ZHANG Qi;WANG Jianjun;GE Hong
		Study on Production of Manganese Sulfate by Absorption of SO2 From Sintering Fume With Pyrolusite and Mild Manganese
		The BFconverter route of steelmaking is a chemical process of iron and coal. Sulfur dioxide is released in sintering process which can be absorbed by pyrolusite and mild manganese to produce manganese sulfate. The experiments of removal of SO2 with pyrolusite and mild manganese were performed, and the pH scale of pulp was controlled; utilizing the oxidability of MnO2 and reducibility of SO2, the pyrolusite pulp was put into the absorption tower of padding. The above90% absorptivity of flue dust indicated that wet dust collection was available to this technique, in which the absorptivity of SO2 was above 95%, and the byproduct technical grade manganese sulfate was produced. The technique is proved to be a new technology on:removal of SO2， for waste treatment.
		2007 Vol. 42 (4): 78-0 [Abstract] ( 2836 ) [HTML 0KB] [PDF 0KB] ( 96 )

装备与控制

	83	P.D.Hubbeling;G.A.Oostermeijer
		Sublance and Dynamic Control in Converter Steelmaking
		The sublance system, static and dynamic model of converter steelmaking of in Danieli Corus are introduced. The taptotap time, hot metal consumption, scrap consumption and oxygen consumption can be reduced by using sublance system. Improvement of process efficiency, higher accuracy of endpoint temperature and carbon content, Fe content decrease in slag can be achieved by the application of static and dynamic model.
		2007 Vol. 42 (4): 83-0 [Abstract] ( 3063 ) [HTML 0KB] [PDF 0KB] ( 103 )

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