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	2016 Vol. 51 No. 5
	Published: 2016-05-15

	1	ZHENG Wen-hua，WEN Yan-ming，ZHENG Bo
		Operation and development trend of coking industry in China in new normal
		China’s current steel production and consumption has entered the peak platform area， influenced by which， China’s coke production and consumption has also entered the peak plateau region. As a result of excess capacity，extensive development， increasing environment pressure，lack of innovation，the industrial structure of coking industry in China is stepping into the in-depth adjustment period. In this circumstance of unprecedented difficulties applied on many businesses，it is essential to commence an intensive research on the positive and negative factors affecting the development of coking industry by analyzing the trend，transforming development patterns，changing motive force of growth and adopting countermeasures to improve value integration capability to reverse the passive situation and realize a sustainable development for the coking industry.
		2016 Vol. 51 (5): 1-8 [Abstract] ( 826 ) [HTML 0KB] [PDF 0KB] ( 56 )

	9	HE Mu-guang
		Effect of[w(TiO2)]on sintering properties of high titanium vanadium-titanium magnetite
		In order to explore the effects of different contents of TiO2 on the sintering properties of high titanium vanadium-titanium magnetite， the current study adopted titanium concentrate whose size distribution and compositions were similar to that of Panzhihua concentrates to vary [w(TiO2)]. The design could eliminate the effects of the change of particle size in the sintered material on the experimental results， which could truly reflect the influence of TiO2 well. Main results show that under the condition of high alkalinity of sinter and the same compositions， when the [w(TiO2)]in sinter increased from 6% to 10%， both the initial melting temperature and the melting temperature increased， the strength and yield of sinter decreased， the reduction powdered ratio of sinter in low temperature rose， and the reducibility and the droplet property became worse. While the storage performance of sinter had little change. On the other hand， the contents of hematite titanium iron and calcium ferrite decreased， the contents of titaniferous magnetite and titanium mineral perovskite， titanium pyroxene， garnet titanium increased. The hole number in sinter increased， and the mineral morphology and structure became worse.
		2016 Vol. 51 (5): 9-16 [Abstract] ( 694 ) [HTML 0KB] [PDF 0KB] ( 48 )

	17	ZHANG Shu-hui，LAN Chen-chen，Lü Qing，SUN Yan-qing，QIE Ya-na
		Experiments on dechlorination capacity of blast furnace slag
		In order to find out the reasonable and effective dechlorination system of blast furnace slag and maximize the dechlorination capacity， on the basis of the thermodynamic analysis of chlorine reactions in blast furnace， the effects of chemical composition， temperature and the time in high temperature of blast furnace slag on the dechlorination capacity were studied. The results show that the dechlorination rate rised with the rising basicity and fell with the rising temperature. The increase of [w(MgO)]made the dechlorination capacity increase first and then decrease， while for the condition with increasing[w(Al2O3)]， the dechlorination capacity improved first and with[w(Al2O3)]beyond 16%， the dechlorination rate had no significant change. The extended time in high temperature had a negative effect on the dechlorination rate. On the basis of normal production， it is better to improve appropriately the basicity and decresase the temperature of blast furnace slag， increase the number of tapping of slag and iron， and maintain the[w(MgO)]and[w(Al2O3)]at approximately 11% and 16%. The above measurements could improve the dechlorination capacity of blast furnace slag and reduce the negative effect of chlorine on the blast furnace smelting and subsequent equipments.
		2016 Vol. 51 (5): 17-21 [Abstract] ( 764 ) [HTML 0KB] [PDF 0KB] ( 63 )

	22	LIU Yu-bao，，WANG Jing-song，ZHANG Xian-heng，ZHAO Er-xiong，XUE Qing-guo，SHE Xue-feng
		Selective reduction of Baotou Nb-bearing iron ore concentrate
		The treatment of Nb-bearing iron ore concentrate by the method of selective reduction in tank and using semi-coke as the reductant was discussed， the change law of the metallization rate under different reduction conditions was studied. The occurrence of niobium was observed by scanning electron microscope. The enrichment degree of niobium oxide was investigated after the reduction of Nb-bearing iron ore concentrate by means of melt-separation and deferrization. Main results show that holding in the temperature from 940 to 970 ℃ for 2.5 h， the metallization rate of the iron oxide in the Nb-bearing iron ore concentrate reached more than 85%. Niobium oxide was not transformed to niobium metal in the reduction. Niobium which was mainly in the form of titanium and iron silicate was distributed in the reduced agglomerate. By the way of melt-separation and deferrization， the study obtained iron metal and niobium-enriched slag， for the latter， the concentration of niobium oxide in niobium-enriched slag was 1.55 times that in crude minerals.
		2016 Vol. 51 (5): 22-27 [Abstract] ( 947 ) [HTML 0KB] [PDF 0KB] ( 62 )

	28	ZHAO Chang-liang，，SUN Yan-hui，YUAN Tian-xiang，YAN Zhan-hui，LUO Lei
		Dephosphorization pretreatment in LD converter and less-slag steelmaking process
		The technology of hot metal dephosphorization pretreatment and less-slag steelmaking process was optimized step by step in Shougang Jingtang. The dephosphorization rate could reach 70% through the optimization of scrap size，bottom tuyer number and arrangement in De-P converter. The steady temperature and P content in semi-steel after the pretreatment in De-P converter can provide a good condition for the less-slag steelmaking and automatic steelmaking to achieve double hit ratios by steelmaking end. By the measurements，such as keeping slag operation，less-slag steelmaking and slag splashing technology，the automatic end-point aim can reach 90% and the lining life was more than 7 000. All the materials containing Fe，such as steel containing slag， precipitator dust，scales and so on，were all recycled in steelmaking plant. Through the dephosphorization pretreatment and less-slag steelmaking process，the quality of steel improved，the total content of S，P，N can reach less than 0.009 5% in ultra-low P and S steel grades.
		2016 Vol. 51 (5): 28-36 [Abstract] ( 1197 ) [HTML 0KB] [PDF 0KB] ( 56 )

	37	LIN Yang，，TANG Fu-ping，SHEN Ming-gang，WANG Xiao-feng，TANG Wan-ru，AI Xin-gang
		Decarburization by carbonate decomposition of CO2 in RH process
		An investigation on decarburization by carbonate decomposition of CO2 in RH process has been put forward. By means of spraying calcium carbonate powder into molten steel from the upper snorkel， the decarburization reaction and purifying molten steel were promoted. The decarburization mechanism of this novel technique has been analyzed. The industrial experiments have been carried out to investigate the variation of the cleanness of molten steel before and after the treatment. The results indicate that decarburization reaction took place after carbonate decomposition of CO2 decarburization treatment and decarburization process was accelerated， which led to shorten at least 3 min for the RH processing time and reduce 3-5 RMB for the production cost per ton steel.[w(T[O])]in the as-cast slab approached to 0.001 0% after non-oxygen promoting decarburization treatment， which improved the cleanness of the molten steel significantly.
		2016 Vol. 51 (5): 37-40 [Abstract] ( 812 ) [HTML 0KB] [PDF 0KB] ( 70 )

	41	ZHAO Cheng-lin，ZHANG Ning，KANG Lei，CAO Dong，LI Guang-bang
		Experiments on dephosphorization of BOF slag by carbothermal reduction
		The thermodynamic analysis of dephosphorization of BOF slag by carbothermal reduction was studied， and many experimental studies were carried out in the molybdenum disilicide high-temperature heat treatment resistance furnace and the 500 kg top and bottom combined blowing multifunctional furnace. The results indicated that reaction temperature and dynamic condition had significant effects on the dephosphorzition rate. In the high temperature heat treatment resistance furnace， 1 500 ℃ reaction temperature can be guaranteed and about 30% dephosphorzition rate can be reached under the condition of carbon equivalent 3.0 and 30 min holding time. In the top and bottom combined blowing multifunctional furnace， coke powder can be used as reduction material and heating-up material. Dephosphorization reaction processing under the high temperature can be guaranteed by the exothermal reaction between coke powder and oxygen. Meanwhile， the top-blowing oxygen agitated the molten slag layer， which benefit to increasing the dephosphorization rate more， dephosphorization rate reached 84% in the whole process， thereinto， dephosphorization rate in the molten pool was 75.85%， dephosphorization rate of evapouration was 8.15%. 10.8% sulphur carried by coke powder entered the molten steel and 6.25% entered the molten slag.
		2016 Vol. 51 (5): 41-44 [Abstract] ( 875 ) [HTML 0KB] [PDF 0KB] ( 50 )

	45	XU Jian-fei，HUANG Fu-xiang，WANG Xin-hua，JING Cai-liang
		Influence of silicon content in steel on tapping slag infiltration desulfurization
		The industrial experiments of 21 heats were conducted at a commercial steel plant to analyze the efficiency of desulfurization during tapping slag infiltration. The results show that the influence of silicon in the steel on the tapping slag infiltration desulfurization was significant for the steel with the aluminum content of 0.025%-0.045% and the sulfur content of 0.002%-0.003%， while the influence of manganese content in the steel on the tapping slag infiltration desulfurization was not apparent. The sulfur content of pipeline steel can be controlled stably below 0.002% in the present process of tapping slag infiltration when the silicon content in steel was controlled above 0.05%. Moreover， the reactions of Al-O， Si-O， CaO-S and Fe-O were coupled based on the coupled reaction kinetics model and it shows the silicon content in steel influences the desulfurization effect during tapping by influencing the oxygen activity at the interface between slag and steel. The oxygen activity at the interface between slag and steel was determined by the oxidability of slag when the oxygen activity of molten steel was certain， and the compositions of slag after tapping slag infiltration desulfurization show that the oxidability of slag with the less than 0.05% silicon content is higher than that with the silicon content beyond 0.05% in steel， which was consistent with the calculated results.
		2016 Vol. 51 (5): 45-51 [Abstract] ( 788 ) [HTML 0KB] [PDF 0KB] ( 52 )

	52	SONG Xiao-fang，HE An-rui，QIU Zeng-shuai
		Influence of initial temperature difference on high strength strip buckling in laminar cooling
		Because of bilateral wave on high strength strip after laminar cooling for high temperature difference between edge and central area，initial temperature difference experimental devices were built up to measure residual stress in the length direction under different conditions. Then，the model of strip stability analysis was built，and analytical method was used to calculate the critical residual stress when the buckling of strip happens. According to the critical residual stress and fit result of initial temperature difference and residual stress，the critical initial temperature difference was calculated，which is 40 ℃ and the result is important to guide the production.
		2016 Vol. 51 (5): 52-56 [Abstract] ( 822 ) [HTML 0KB] [PDF 0KB] ( 68 )

	57	FEI Jing，ZHANG Yan，WANG Jun-sheng，QIN Da-wei，HOU Yong-gang，XU Han-bing
		Development and application of coating thickness control system for cold rolling continuous galvanizing line
		For the cold rolling continuous galvanizing line，the control level of the coating thickness has a direct effect on the product quality，the cost and the market competition of hot galvanized sheet. Based on the background of Ansteel continuous galvanizing line，the current study mainly involved the research on the precise control of zinc coating thickness of cold-rolled sheet.The main factor influencing the precision of coating thickness was analyzed by means of the software FLUENT for the numerical simulation in gas-jet wiping process.The key model of coating thickness control system has been built with the adoption of air knife pressure feedforward control and Smith predictive compensation control methods. The coating thickness precise control was realized by adopting the software LABVIEW for the system development. Production results show that the application of the control system reduced the deviation of coating thickness and obtained well control effect. The application of coating thickness automatic control system not only meets the demand of improving product surface quality，but also provides an important significance on cost saving and reducing the zinc raw material consumption .
		2016 Vol. 51 (5): 57-61 [Abstract] ( 810 ) [HTML 0KB] [PDF 0KB] ( 62 )

	62	HU Xian-jun，ZHOU Li-chu，WANG Lei，FANG Feng
		Effect of severe plastic deformation on austenitization transformation of pearlitic wire
		With the help of metallographic microscope， scanning electron microscope， transmission electron microscope， X-ray diffractometer and synchronous thermal analyzer technique， the effect of cold drawing deformation on the austenitization process of pearlitic wire and its structure was investigated. After the severe plastic deformation of cold drawing process， the pearlitic turned to the fibrous form. The pearlitic lamellae were arranged along the drawing axial direction with severely reduced thickness and the intensity of ferrite <110> fiber texture reached saturation after high strain deformation. During the austenitization process， the cold drawn pearlite transformed into austenite faster than the no deformed pearlite， and the austenite grew along the cold drawing axial direction with higher density. After isothermal transformation treatment， smaller original austenite crystals and pearlite colonies could be obtained from the cold drawn pearlite wire. Furthermore， the ferrite <110> fiber texture was partly inherited to the transformed phase and the morphological feature of arrangement along the layer direction was not inherited.
		2016 Vol. 51 (5): 62-68 [Abstract] ( 904 ) [HTML 0KB] [PDF 0KB] ( 75 )

	69	HUANG Ben-sheng，CHEN Peng，ZHANG Rong-fu，YIN Wen-feng， CHEN Xiang，LI Jia-chen
		Microstructure and properties of 316L/X65 bimetal clad pipe welding joints
		316L/X65 bimetal clad pipe was welded by GTAW and SMAW. The microstructure， chemical composition， mechanical properties and electrochemical corrosion behavior of welding joints were investigated by OM， EDS， SEM， hardness test， tensile test， impact test and electrochemical test. The results show that the chemical composition of transition welding seam is little diluted， and elemental migration appears near the fusion line of transition weld seam. Welding seam and base material have the same chemical composition in stainless steel layer. The microstructure of transition layer is characterized by the martensite-like and retained austenite； the transition layer and stainless steel layer contain austenite and a little ferrite. The defect free joint is produced and performed well under the experimental parameters. The difference of electrochemical corrosion properties between weld seam and base material in stainless steel layer is very little.
		2016 Vol. 51 (5): 69-75 [Abstract] ( 862 ) [HTML 0KB] [PDF 0KB] ( 62 )

	76	DAI Jian，SUN Wen-qiang，CAI Jiu-ju，ZHANG Xing-liang
		Analysis of energy consumption for electricity and steam driven BF blast system
		To eliminate the disputes about the energy efficiencies between the electricity- and the steam driven BF blast systems，an energy utilization efficiency model and a unit consumption analysis model were developed in this study to investigate the differences of energy efficiency and energy consumption between electricity- and steam-driven BF blast systems in theory. It is shown that， for energy efficiency，an overlapping interval exists between the electricity-driven BF blast system and the steam-driven BF blast system. And the upper limit of energy efficiency for the electricity-driven BF blast system approximately equals to the lower limit for the steam-driven BF blast system. With the increase of steam temperature and pressure，the steam consumption decreases for both blast systems. When the parameters of blower are constants，the theoretical minimum steam consumption of BF blast system is the inherent property of steam with special parameters，which has no relation with the driven mode and process. The theoretical minimum steam consumption reduces while the BF volume，the steam temperature and pressure increase.
		2016 Vol. 51 (5): 76-80 [Abstract] ( 799 ) [HTML 0KB] [PDF 0KB] ( 51 )

	81	LONG Yue，，DU Pei-pei，，LI Zhi-hui，，，ZHANG Liang-jin，，ZHANG Yu-zhu，
		Influences of acidity coefficient on physical and chemical properties of slag wool
		In order to determine the optimum acidity coefficient of modifying blast furnace slag in slag wool production process. Using four-roll centrifugation method，slag wool with different acidity coefficients was prepared under the laboratory condition，and the influences of acidity coefficient on the physical and chemical properties of slag cotton was studied by testing the physical and chemical performances of mineral wool. The results show that the diameter of slag wool increased exponentially with the increase of acidity coefficient，the mineral wool mainly consisted with vitreous body structure. With the increase of acidity coefficient，the crystallization temperature decreased，and the temperature needed to form fiber became wide. Under the condition of weak acid，the microstructure on the surface of slag wool with different acidity coefficients had no obvious change，and the surface was still relatively smooth. Under the alkaline conditions，corrosion phenomenon appeared on the surface which was more rough，accompanying by the generation of newborn hydration phase. It is better to maintain the blast furnace slag acidity coefficient between 1.0-1.4 during the production of slag wool.
		2016 Vol. 51 (5): 81-87 [Abstract] ( 886 ) [HTML 0KB] [PDF 0KB] ( 59 )

	88	WU Si-wei，ZHOU Xiao-guang，CAO Guang-ming，SHI Nai-an，LIU Zhen-yu，WANG Guo-dong
		Hot rolling C-Mn steel industry big data preprocessing for improvements on the model
		It is easy to construct a model that meets a certain requirement of precision through neural network base on big data of C-Mn steels. In this case， the original industry data are usually without preprocessed or preprocessed by remove the abnormal value simply. However， there will comes a situation that is contrary to the objective laws if the regularity of the model is further studied. This is due to a large amount of data in the original data to interfere with each other and the discrete distribution of the industry data. Therefore， in order to construct a reasonable model， redundant and large error data must be removed， while the distribution of train data and prediction data must be uniform. In this way， the amount of calculation of the model is reduced while a significant regularity of data is excavated. For the sake of verify the hypothesis of ways to use big data， Bayes regularization neural network was selected to construct a model for mechanical properties of multi-steel number. At the same time， the process parameters which influence on yield strength were analyzed. By statistics， the prediction accuracies of yield strength and tensile strength data are 96.64% and 99.16%， respectively， of which the absolute error between the predicted value and the measured value lies in the ±30 MPa. Among the predicted data of the elongation rate， 85.71% of the data absolute error between predicted value and measured value is within ±4%.
		2016 Vol. 51 (5): 88-94 [Abstract] ( 831 ) [HTML 0KB] [PDF 0KB] ( 46 )

	95	FENG Gang，，ZHANG Chao-ge，GONG Da-wei ，HAN Cheng-jiang，LIN Ke-wei，QI Ji-bao，
		Closure behavior of fatigue crack by finite element method
		The behaviour of fatigue crack growth was significantly changed by the closure behavior of fatigue crack. The crack closure behaviour of 316L stainless steel was investigated by combining the loading test and the numerical simulation to study the dynamic crack propagation. The fatigue crack growth experiment included the constant amplitude loading and single tensile overload. The crack closure behaviour and the crack growth rate in different propagation period were studied with different crack length， stress ratio and overload. The intrinsic mechanisation between the single tensile overload and the crack closure was discussed. An improved model to calculate the effective stress intensity factor range was applied based on the theory of crack closure and the calculated results. The prediction formulation of crack growth rate was fitted about the 316L steel.
		2016 Vol. 51 (5): 95-98 [Abstract] ( 782 ) [HTML 0KB] [PDF 0KB] ( 67 )

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