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	2018 Vol. 53 No. 3
	Published: 2018-03-15

	1	LONG Hong-ming，，WEI Ru-fei，LI Ning，ZHOU Di，MENG Qing-min，LI Jia-xin，
		Disposal of city combustible solid waste by blast furnace
		Serious pollution to the environment is caused by the increasing city combustible solid waste，and how to effectively deal with them has become a major problem. The chemical composition，the calorific value，the combustion characteristics and research status of city combustible solid waste were discussed. The city combustible solid waste mixed injection was put forward based on the physicochemical properties and processing properties of city combustible solid waste，which could bring new fuel for the blast furnace， dispose many kinds of city combustible solid waste，complete the solid waste disposal on the surrounding society，and expand the social function of steel plant in the city.
		2018 Vol. 53 (3): 1-9 [Abstract] ( 574 ) [HTML 1KB] [PDF 1132KB] ( 1261 )

	10	LI Ming-ming，，HUANG Run，，ZHONG Zheng，，ZHANG Jin-zhu，
		Intensive reduction of high phosphorus oolitic hematite by borax
		The oolitic hematite ore was recognized as one of the most difficult iron ores to use because of its unique oolitic structure， fine iron particle size， and high phosphorus content. The reduction of high phosphorus oolitic hematite played an important role in subsequent magnetic separation， especially the accumulation and growth of iron. The influence of borax on the reduction of high phosphorus oolitic hematite was studied. It indicates that the weight loss rate is up to 31.11% and the metallization rate is up to 90.10% when the temperature is 1 000 ℃ and the borax percentage is 6%. XRD and SEM analyses show that borax could decrease the melting point of the reactant.On the other hand，the diffraction peaks of fayalite （Fe2SiO4）， ferrospinel （FeAl2O4） and kyanite （Al2SiO5）disappear， and then the ones of anorthite （CaAl2Si2O8）， sodium aluminum borate（Na2Al2B2O7） and sodium borate （Na2B6O10） with low melting points appear. In the end， the amount and particle size of iron in the reduced samples increase with the addition of borax increasing.It indicates that the effect of reduction is strengthened.
		2018 Vol. 53 (3): 10-15 [Abstract] ( 473 ) [HTML 1KB] [PDF 1225KB] ( 1482 )

	16	TUO Jian-de，HOU Ming-qiang，FU Guang-jun
		Optimum basicity and economy of high silicon sinter
		The change of basicity of sinter will have some influence on its yield， quality， metallurgical property and economic and technical index of blast furnace. The relationship between the basicity of sinter and sinter yield， yield of the blast furnace as well as coke ratio effect was compared， and the influence of sinter basicity change on the sinter yield， utilization coefficient and metallurgical properties of correspondence was tested. When the basicity of sinter with high silicon in Jiuquan Steel is within 1.6-1.9 ， the metallurgical properties and various indexes are better. The utilization coefficient increases with the increase of basicity. Within the basicity interval and reducing the sinter basicity， the sinter and blast furnace grade can be improved， and the cost of pig iron can be reduced.
		2018 Vol. 53 (3): 16-21 [Abstract] ( 387 ) [HTML 1KB] [PDF 1500KB] ( 1268 )

	22	LIU Jie，ZHAO Dong-ming，LI Jian-jun，ZHOU Ming-shun，ZHANG Hui，XU Li-bing
		Research and application of blast furnace’s low[w(MgO)]slag in Ansteel
		In order to improve technical and economic indexes of blast furnace， the metallurgical properties of low [w(MgO)] slag were studied and evaluated systematically by laboratorial and industrial test in Ansteel. The results show that under the low Al2O3 load in blast furnace， the[w(MgO)]in slag is 4%-7%，and the melting temperature of all the slag is less than 1 350 ℃. When the temperature of slag is 1 500 ℃， the viscosity of the slag can satisfy the need of blast furnace in theory with[w(MgO)]over 3%. The best basicity of slag is about 1.245. Under the production condition in industry， the[w(MgO)]of slag is controlled in 4.5%-5.0%， and the viscosity of slag is about 0.16-0.20 Pa·s. The desulfurization capacity of the slag may not fall down when[w(MgO)]in slag decreases by optimizing basicity of slag. The production cost from BF operation decreases obviously and 17 kg/t（Fe） of the slag ratio is almost reduced by adopting new technology. So， it helps to implement green sustainable development.
		2018 Vol. 53 (3): 22-26 [Abstract] ( 479 ) [HTML 1KB] [PDF 829KB] ( 1368 )

	27	DENG Jian-jun，ZHANG Ming-bo，LI Jian-xin，QIU Sheng-tao，WANG Shi-zhao，NING Shu-bo
		Thermodynamics of dephosphorization capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag
		A dephosphorization thermodynamic model was established based on the coexistence theory and the principle of metallurgical dephosphorization. The thermodynamic study on the phosphorus distribution ratio and phosphate capacity of CaO-based steel slag which contained TiO2 and Al2O3 was carried out， and the thermodynamic model of phosphorus distribution ratio and phosphorus capacity of containing TiO2 and Al2O3 of CaO-based semi-steel slag were obtained. The calculated results indicate that the ability of dephosphorization would be reduced with the increase of[w((TiO2))]and [w((Al2O3))，]especially under the low temperature and low alkalinity conditions. The effect of TiO2 is greater than that of Al2O3 with the same content of the two oxides. The phosphorus distribution ratio and phosphate capacity increase first and then are almost invariant with the increase of alkalinity， increase first and then decreased as[w((FeO))]increasing， and decrease with the[w((MgO))]increasing. Semi-steel is smelted by semi-steel slag ball， and the[w((TiO2)＋(Al2O3))]and [w((FeO))]increase as semi-tempered slag ball isused， and[w((MgO))]decreases. On accounting of the synergistic action of FeO and MgO， the phosphorus distribution ratio and phosphate capacity increase. It is better for the increase of the phosphorus distribution ratio and phosphate capacity and weakening the influence of[w((TiO2)＋(Al2O3))]when the basicity of slag is about 4.0 and[w((FeO))≤20.0%，]and the proportion of semi-tempered slag ball is 15.0 %-20.0 % of total slag.
		2018 Vol. 53 (3): 27-37 [Abstract] ( 401 ) [HTML 1KB] [PDF 932KB] ( 1260 )

	38	WANG Ze-peng，，XIAO Peng-cheng，，ZHU Li-guang，，LIU Zeng-xun，，ZHANG Shi-jun，
		Temperature analysis for mold copper tube of billet continuous casting
		Based on the characteristics of mold heat transfer，a three-dimensional transient heat transfer model of billet continuous casting mold is established. Casting process of the billet is simulated by a node temperature transfer method. The ANSYS finite element software is used to analyze the model. The three-dimensional steady-state temperature field of the billet mold is obtained by sufficient iteration and compared with the traditional two-dimensional model. The influence of scale on mold temperature distribution has been analyzed through the continuous change of the scale loading technique of dynamic boundary conditions. The result is detailed as follows. The analyzed result obtained by three-dimensional heat transfer model in the top zone of the mold is basically coincident with copper wall temperature distribution rule. The copper wall temperature reached its peak at 50 mm near the meniscus. The highest temperature of copper wall would be increased from 187 to 318 ℃ when meniscus scale thickness added from 0.1 to 0.5 mm. In this case，high temperature region of copper wall would be expanded so that copper wall deformation degree could be increased.
		2018 Vol. 53 (3): 38-43 [Abstract] ( 580 ) [HTML 1KB] [PDF 1089KB] ( 1690 )

	44	YANG Wei，LI Wei-gang，，ZHAO Yun-tao，YAN Bao-kang，WANG Wen-bo
		Mechanical property prediction of steel and influence factors selection based on random forests
		Many factors affecting the steel mechanical property and there are complex interactions among different factors. It is helpful to improve the model accuracy by reasonably selecting the influence factors of the property prediction model. Using the random forest algorithm and mechanical property modeling method combining data and mechanism analysis，the mechanical property prediction of hot rolled strip and selection of the influence factors are studied. Firstly，based on a large amount of production data of hot rolling process，the variable importance ranking was obtained by using random forests algorithm.Based on the importance ranking of influence factors，a series of mechanical property prediction models are established by increasing the number of independent variables. After that，according to the variation trend of the prediction error of each model，the influence of various factors on the precision of the model are determined，thereby，the more important factors are selected，and the prediction model with a small number of important factors as independent variables is established in the end. Finally，the tensile strength modeling experiment of Nb high strength steel products produced by a large hot strip mill in China was carried out，practice results shows that the mechanical property prediction model based on Mn，Cs，FDH，NbC，NbN，RT，Si，CT，FET has a high predicted accuracy，mean absolute percentage error is 2.52% and root mean square error is 21.65 MPa.
		2018 Vol. 53 (3): 44-49 [Abstract] ( 534 ) [HTML 1KB] [PDF 845KB] ( 1232 )

	50	REN Xin-yi，WANG Song-tao，GAO Hui-min，XIONG Ai-ming，TANG Wei，HUANG Hua-gui
		Analysis on shape control performance of cold tandem mill with ESS roll profile
		Taking the six-high five-stand cold tandem mill of 2 230 mm as research object，the three-dimensional nonlinear mill simulation model with intermediate roll using ESS profile wase stablished through the ABAQUS finite element software platform. By numerical simulation，the variation law of the shape regulation region was analyzed under the combined action of shape control means including work roll bending， intermediate roll bending and intermediate roll transverse movement. Meanwhile， the control performance of different parameters including work roll bending force，intermediate roll bending force and intermediate roll transverse movement value to quadratic crown and quartic crown of the strip was researched systematically. The application results show that the mill with ESS profile has a good control effect on the shape and transverse thickness of the strip.
		2018 Vol. 53 (3): 50-56 [Abstract] ( 511 ) [HTML 1KB] [PDF 1594KB] ( 1286 )

	57	ZHANG Zhi-feng，，BAI Yin，Lü Zhi-qing，BAO Han-sheng
		In-situ characterization of microstructure evolution of TP347H in solution treatment
		To investigate the microstructure evolution regularity of the TP347H stainless steel in the process of solid solution，the isothermal microstructure evolution of TP347H stainless steel at 1 100，1 150 and 1 200 ℃ was observed in situ using confocal scanning laser microscope （CSLM）. The characteristic of precipitates in TP347H was analyzed by SEM and OM，calculated by Thermo-Calc thermodynamic calculation software. The results showed that Nb（C，N） phase precipitated in the TP347H stainless steel during the heat treatment and the mole fraction of Nb（C，N） phase decreased with the increasing of solid solution temperature. The smaller secondary Nb（C，N） could dissolve and precipitate in the process of solid solution treatment，while the primary Nb（C，N） phase would not change. As solid solution temperature increased，the grain size increased quickly，which owed to the re-dissolution of secondary Nb（C，N）. The main way of grain growth were the merging of grains and the grain boundary migration.
		2018 Vol. 53 (3): 57-65 [Abstract] ( 398 ) [HTML 1KB] [PDF 3894KB] ( 1150 )

	66	JIANG Guang-rui，WANG Hai-quan,，LIU Li-bin，LIU Hua-sai,
		Effects of heating atmosphere on selective oxidation of aC-Mn-Si-Al high strength steel
		To research potential of applying local dew point technology on Al-bearing high strength steel，effects of dew points during heating on selective oxidation behavior of a C-Mn-Si-Al steel were studied through a hot-dip process simulator （HDPS）. The dew points during heating were set as －10，－20 and －50 ℃，respectively，while the dew point during soaking was －50 ℃. External surface of as-annealed steel samples was characterized by SEM/EDS. Alloying element profiles were detected by GDOES. Kinds of compound on the external surface were identified by XPS. As heating with the dew point of －10 ℃，little oxides could be found on the external surface and remarkable internal oxidation of Al could be found. As the dew point during heating decreased to －50 ℃，much more oxides composed with manganese and aluminum were observed on the external surface. Therefore，high dew point during heating extremely suppress enrichment of alloying elements and formation of oxides on the external surface for the C-Mn-Si-Al steel.
		2018 Vol. 53 (3): 66-71 [Abstract] ( 490 ) [HTML 1KB] [PDF 875KB] ( 1303 )

	72	LI Yan-long，QI Liang，SHAO Chuan-bing，MA Lin-ting，CHENG Liang，LI Yin-li
		Improvement of high manganese steel in ball mill lining
		The problem of easy cracking and deformation of high manganese steel wear liner was studied by analysis of composition and properties. The hardness，wear resistance，impact resistance and service life of high manganese steel wear liner were greatly improved by added a certain amount of alloy additives and improve the heat treatment. Finally the hardness，abrasion resistance，tensile strength and yield strength of high manganese steel were improved 10.7%，62.7%，7.4% and 8.13% respectively.
		2018 Vol. 53 (3): 72-75 [Abstract] ( 416 ) [HTML 1KB] [PDF 783KB] ( 1483 )

	76	ZHANG Chuan-guo，，ZHAI Qi-jie，ZHENG Lei
		Effect of slab reheating processes on microstructure and properties for heavy gauge pipeline steel
		In order to improve strength and toughness for heavy gauge pipeline steel，by using the way of physical simulation，pilot rolling and SEM，EBSD analysis，the coarsenning characteristics，the effect of slab reheating parameters on mechanical properties and microstructure were studied for 30 mm X65 pipeline steel，emphasized on the analysis of the strengthening and toughening mechanisms. The results show that，with increasing the reheating temperature，the initial austenite grain size tends to coarse and the microstructure of trial steel changed from the fine ferrite to bainite dominated，which induce higher strength and lower charpy impact energy and DWTT shear area ratio. With increasing the soak time，there is no obvious change for strength，DWTT shear area and microstructure，however，the chary impact energy increase for high reheating temperature while decrease for low reheating temperature. EBSD analysis shows that the grain coarsening reduces the charpy impact energy，and increasing the proportion of high-angle grain boundary promotes the DWTT performance.
		2018 Vol. 53 (3): 76-81 [Abstract] ( 474 ) [HTML 1KB] [PDF 1891KB] ( 1141 )

	82	WANG Kai-xiang，LONG Hong-ming，，，MENG Qing-min，，WEI Ru-fei，，ZHANG Hao，
		Steel slag cementitious activity and mechanism based on physical excitation
		Steel slag is the major solid waste produced in the metallurgical industry. In order to increase its gelling activity and achieve the utilization of resources，The steel slag tailings cementitious activity was stimulated by mechanical grinding. According to the relevant standards，the activity indexes of 3 d and 28 d were investigated. The results show that mechanical grinding is beneficial to the decrease of particle size and the optimization of uniformity，but once the grinding time is too long，which will lead to the agglomeration of the steel slag powder and affect the mechanical properties and gelation properties of the cementing materials. When the grinding time is 80 min，the powder can be filled in the cement mortar system well，and the active substances 3CaO·SiO2 and 2CaO·SiO2 produced a large amount of C-S-H gel after hydration，resulting in the highest cementitious activity which the 3 d activity index is 66.24%，and the 28 d activity index is 73.56% respectively.
		2018 Vol. 53 (3): 82-86 [Abstract] ( 425 ) [HTML 1KB] [PDF 773KB] ( 1298 )

	87	WANG Qing-guo，，ZHU Tong，LI Yong
		Sintering flue gas purifying process and equipment by use of activated coke in Baosteel
		The removal mechanisms for main pollutants in sintering flue gas，process flow for flue gas purification and systematical equipment of the sintering flue gas purifying systems by activated coke were introduced in detail，which is the first self-designing and manufacturing purifying system of its kind in China. The major facilities including flue system，adsorption system，desorption system，activated coke storage and transportation system were systematically and completely illustrated. The inner structure，working principle and relevant designing and operating parameters of some major equipment were concisely presented. The technological characteristics of this purifying system were summarized through analyzing and the actual treatment effect was presented，which had the advantages of high reduction rate of pollutants and steady and reliable operating performance. SO2 content ranges from 412.091 to 642.811 mg/m3 before being purified，while its content is decreased between 1.227 and 7.999 mg/m3 after treatment，with a high removal rate from 98.53% to 99.76% on the basis of daily averages. [NOx]content ranges from 235.451 to 365.218 mg/m3 before being purified，while its content is decreased between 92.707 and 137.663 mg/m3 after treatment，with a removal rate from 57.63% to 69.44%. The toxic equivalent quantity of dioxin ranges from 0.82 to 5.40 ngTEQ/m3 before being purified，while its TEQ is decreased between 0.002 3 and 0.008 9 ngTEQ/m3 after treatment，with a high removal rate from 99.43% to 99.89%. The dust content after treatment is decreased between 7.747 and 11.500 mg/m3. An evaluating conclusion on this purifying system was drawn based on the actual treatment effect and practical run performance. Meanwhile，the application prospect of this new purifying system was predicted.
		2018 Vol. 53 (3): 87-95 [Abstract] ( 717 ) [HTML 1KB] [PDF 1750KB] ( 1740 )

	96	WANG Peng，WU Wei，MENG Hua-dong，YIN Chuan-lei ，LI Xiang-chen
		Process optimization for improving hit rate of BOF end-point temperature in Huaigang Works
		To solve the problems of low BOF end-point temperature hit rate and high consumption of slag materials， the smelting process was optimized for a 100 t converter in Huaigang. The main measures include the selection of oxygen lance nozzle parameters， the determination of lance height in smelting process， addition time of slag material and mode optimization of bottom blowing process. The oxygen lance parameters were optimized according to actual working oxygen pressure. The low-high-low lance height model was used and total lance height increased 0.1 m compared with original process. The amount of slag materials was controlled， and the lime and light burned dolomite were 27 and 12 kg/t （steel）. The bottom blowing rate of converter increased from 0.02 to 0.1 m3/（t·min）. The industrial test results show that temperature hit rate of BOF end-point was improved by 39.87%， the dephosphorization rate was improved by 2.58%， the total slagging materials consumption was reduced by about 8.5 kg /t（steel） and the smelting time was shortened by 0.53 min. By means of petrographic analysis， the total free calcium oxide in the slag of the new process is controlled at about 5%， which is more stable than that of the old process.
		2018 Vol. 53 (3): 96-103 [Abstract] ( 494 ) [HTML 1KB] [PDF 1465KB] ( 1168 )

	104	LU Jiang-xin，，CHEN Xin-ping，，BAO Ping，JIANG Hao-min，，SHI Lei，
		Technical service and EVI of automotive panel in Baosteel
		In recent ten years，the automobile industry in China has a rapid development，and the related upstream and downstream industries are well developed. In a series of key words such as “Forward Design”，“Lightweight”， “Intelligent” and “New Energy”，"EVI" also goes into people’s horizons and is gradually accepted. EVI is the abbreviation of ‘Early Vendor Involvement’. Baosteel has already established a specific work pattern of ‘532’ for automotive products through exploration and practice for many years. ‘5’indicates five different technical support phases including advanced engineering design， vehicle body design， tooling design， production preparation and cost optimization. ‘3’ means three different collaboration levels which are BIW， part and VA/VE. In addition， ‘2’ stands for two types of solutions， i.e. cost- and lightweighting- oriented objectives. Based on analysis of customers’ requirements and creative EVI solutions， Baosteel not only meets the requirements and creates value for customers， but also carries out a closed loop from technical development to efficient operation that provides guarantee for independent innovation.
		2018 Vol. 53 (3): 104-108 [Abstract] ( 767 ) [HTML 1KB] [PDF 1124KB] ( 1692 )

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