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	2017 Vol. 52 No. 1
	Published: 2017-01-15

	1	YU Yong
		Information architecture design of Hesteel Tangsteel industry for intelligent manufacturing
		Iron and steel industry is an important basic industry of the national economy. In order to achieve its sustainable and coordinated development， it need to accelerate the realization of automation， digital， intelligent manufacturing process. In this paper， the information architecture design of Tangsteel was taken as the study object， the future oriented intelligent manufacturing was taken as the goal， the new information and automation architecture system of Tangsteel was established. Taking the consistent quality design and integrated production and marketing plan as the main line， the one and two level systems were improved in company-wide， and the new three point five level system which includes the advanced company planning and scheduling system， the company order design system and the quality management system was build between three and four level systems； the new two point five level of factory database system was build， it is the data cornerstone of intelligent plant. We implement the system within one to five connected， it leads the enterprise to realize the transformation and upgrading， and the foundation of enterprise intelligent manufacturing.
		2017 Vol. 52 (1): 1-6 [Abstract] ( 1827 ) [HTML 0KB] [PDF 0KB] ( 54 )

	7	SHEN Feng-man，JIANG Xin，GAO Qiang-jian，WEI Guo，ZHENG Hai-yan
		Situation and prospect on production technology of direct reduction iron
		The international and domestic development on direct reduction iron （DRI） are investigated. Direct reduction process is an important part in iron and steel industry due to the coke-free， reduction of CO2 emission， and integrated utilization on resources. Moreover， the purer DRI is indispensable raw materials for clean steel production. Coal gasification followed by shaft furnace technology will be the main method for DRI production due to the progress of beneficiation technology， coal gasification technology， and increase in productivity of gas-based shaft furnace. In addition， a new direct reduction process named as PSH （paired straight hearth） is proposed， which should have good performances. Also， the process of rotary kiln and tunnel kiln can be developed in some area， but will not be the main process for DRI production.
		2017 Vol. 52 (1): 7-12 [Abstract] ( 1687 ) [HTML 0KB] [PDF 0KB] ( 41 )

	13	YANG Shuang-ping，ZHANG Pan-hui，GUO Shuan-quan，WANG Miao
		Roasting technology of semicoke-burdened hematite pellets optimized by response surface methodology
		The main purpose of this paper is to discover the optimal roasting technology of hematite pellets burdened with semicoke by response surface methodology （RSM） to effectively solve the problem of high energy consumption of the hematite pellet roasting. The main influence factors and levels were confirmed by single factor test， the Box-Behnken design was used in systemically researching the effects of main process parameters on the compressive strength of semicoke-burdened hematite pellets. The multiple regression equation for predicting compressive strength was established. The parameters such as roasting temperature， roasting time， airflow volume， semicoke additive amount and their interaction were researched and optimized as well. The optimal values of the roasting process parameters were found at roasting temperature 1 292 ℃， roasting time 18.5 min， airflow volume 3.2 L/min and semicoke additive amount 1.5%. Under the condition of optimized process conditions， the compressive strength of semicoke-burdened hematite pellets was 2 578.3 N， very close to the response target value of 2 500 N. Experimental verification shows that the relative error between experimental and predicted values is simply 3.13%. The results show that the mathematical model is quite accurate and creditable.
		2017 Vol. 52 (1): 13-18 [Abstract] ( 1575 ) [HTML 0KB] [PDF 0KB] ( 64 )

	19	MA Cai-sheng，REN Ting-zhi
		Analysis on wear of chute in blast furnace with bell-less top based on friction work principle
		A mathematical model based on friction work principle was established to predict the chute wear appearance and guide the chute design and operation. The chute wear calculation formula based on friction work principle was developed， the burden motion in the chute was analyzed and the parameters in the formula were thus determined. The model accuracy was verified by industrial test， and the effects of chute structural and burden distribution parameters on the chute wear were further discussed. Results show that in order to decrease the chute wear， it is helpful to shorten the burden falling height， and the chute inner diameter should be slightly larger than the feeding spout diameter. In addition， to extend the charging time for each batch and decrease the angles of chute inclination by increasing the chute length reasonably are beneficial to improve the chute abrasion resistance.
		2017 Vol. 52 (1): 19-26 [Abstract] ( 1625 ) [HTML 0KB] [PDF 0KB] ( 50 )

	27	ZHAO Dan-ting，，LIU Ai-qiang，QIU Sheng-tao，LAI Chao-bin
		Physical-mathematical simulation and application of flow field of molten steel in tundish with filter
		In order to study the effect of channel on flow field in tundish， a research on fluid flowing status and heat transport in a two-strand slab continuous casting with different structure was carried out by using a water model and mathematical model. The results show that the plug flow area in the original tundish was 26.33% only with turbulence inhibitor， wall and dam， and the dead area was up to 17.94%. The effect of optimization was obvious after using the channel filter instead of the dam. Compared with the original tundish， the average resident time of molten steel in the optimized tundish increased from 243.68 to 262.50 s， the dead area fell from 17.94% to 9.11%， and the temperature of outlet was only 2 ℃ lower than that in the original one. It can not only make the operation easier， but also reduce the cost. Field experiment results shows that after 10 heats， there were 19 kg white solid absorpted on the channel of the filter， so the amount of inclusions in liquid steel decreased considerably， and it’s beneficial to improve the quality of continuous cast slab.
		2017 Vol. 52 (1): 27-31 [Abstract] ( 1582 ) [HTML 0KB] [PDF 0KB] ( 64 )

	32	WU Long，SHI Chang-min，LI Jing，XU Zhong-bo，HAN Xiao，YAO Yong-kuan
		Optimum slagging materials smelting in combined-blowning converter based on single-slag steelmaking
		In order to further reduce the cost of steelmaking. On the basis of the thermal state slag circular utilization， the optimum slagging materials smelting technology was explored in Nanjing Iron and Steel Corp. The single-slag steelmaking was applied. Relying on the existing slagging materials and through the thermodynamic calculation of dephosphorization and the converter phosphorus balance of payments， the minimum amount of slag required for dephosphorization was obtained. The lime consumption per ton steel decreased by 42.4%， the dolomite consumption per ton steel decreased by 12%. the limestone consumption per ton steel increased by 34.3% and the cost of steel reduced 4.64 yuan per ton.
		2017 Vol. 52 (1): 32-37 [Abstract] ( 1613 ) [HTML 0KB] [PDF 0KB] ( 66 )

	38	XIAO Hong，，REN Zhong-kai，，LIU Xiao，，YU Chao，，GU Yong-fei
		Experiment and finite element simulation of roll flattening in deformation zone for ultra-thin strip rolling
		The work roll flattening has significant effect on the distribution of rolling pressure during cold ultra-thin strip rolling and temper rolling，thus，the conventional rolling force models are no longer applicable. To obtain accurate rolling force in shape and gauge control process for the ultra-thin strip rolling，Fleck proposed a new roll flattening model. In this paper，the experiment and finite element simulation were carried out to evaluate Fleck model. Workpieces with various thicknesses were rolled by using alloy steel rolls during the experiments. The approximate profile of the roll in the deformation zone was obtained by measuring the thicknesses of different workpiece positions by microscope. Experimental and finite element simulation results show that there was a clear neutral zone in the deformation zone with the decrease of the thickness of the workpiece. However，there is almost no elastic unloading zone in the neutral zone which was mentioned by Fleck. Thus，to simplify the rolling force model，the effect of no elastic zone could be ignorable for the calculation of rolling force.
		2017 Vol. 52 (1): 38-42 [Abstract] ( 1623 ) [HTML 0KB] [PDF 0KB] ( 86 )

	43	CHEN Jian，HUANG Tao，LI You-rong，XIONG Yong
		Analysis of contact pressure between rolls during intermediate roll shifting in 6-high cold rolling mills
		For high-grade cold-rolled steel strip continuous rolling six-high cold rolling mill，in order to make the strip flatness control performance to adapt to changes in material specifications，most of the intermediate rolls adapt the traverse technology. However，intermediate roll shift will make the contact pressure distribution between rolls more uneven，resulting in a contact pressure peak. During the roll shift process，the contact pressure between the rollers and the sliding resistance will change with the change of traverse speed，and may result in the contact pressure between rolls at the ends of the roll to form a larger pressure peak，wearing the rolls unevenly and shortening the life cycle of the roll. In the current study，a finite element simulation model was built to obtain the variation of contact pressure between rolls during the process of the intermediate roller traversing. The optimization design of roll shape and the use of asymmetric bending force method were proposed to achieve a uniform distribution of the inter-roll contact，reduce the contact pressure peak between rolls，and extend the service life of the roll.
		2017 Vol. 52 (1): 43-46 [Abstract] ( 1694 ) [HTML 0KB] [PDF 0KB] ( 64 )

	47	SHI Jing-rui，QIU Bao-wen，，YUAN Ze-xi，SHEN Dong-dong
		Void-cell model and numerical analysis of evolution regular of void in X80 steel
		Tensile fracture characteristics of X80 pipeline steel with high strength and ductility was observed andanalyzed by SEM and image statistical analysis. The void-cell model was designed in terms of the fracture characteristic parameters and a finite element numerical simulation was used to research the evolution regular of void expansion ratio. The results show that the expansion ratio of void volume caused by the inclusions increased slowly with increasing the equivalent strain under low stress triaxiality condition，and the equivalent strain was proportional to the natural logarithm of the volume expansion ration of the void，so linear relationship was in a good agreement. The holes formed by the secondary nucleation of M-A island leading to ductile fracture should be considered lately under high stress condition. The evolution regular of void expansion ration calculated by finite element numerical simulation was different from traditional[R-][T]model for high stress triaxiality under any loading conditions. The expansion ratio of void volume caused by the inclusions increased rapidly and eventually led to ductile fracture.
		2017 Vol. 52 (1): 47-52 [Abstract] ( 1602 ) [HTML 0KB] [PDF 0KB] ( 50 )

	53	XU Hai-feng，，CAO Wen-quan，YU Feng，XU Da，LI Jian
		Current research status and development of domestic and foreign high nitrogen martensitic stainless bearing steel
		At present， high carbon-chromium stainless steel was widely used as stainless bearing steel， which had high hardness and a certain corrosion resistance. However， high carbon and chromium content led to the precipitation of coarse carbides， which was harmful for fatigue property and corrosion resistance. In contrast， with the addition of nitrogen in high carbon-chromium steel， the amount of coarse eutectic carbides decreased， and more fine nitrides and carbonitrides precipitated from martensite matrix， nitrogen replaced partial carbon strengthened matrix and improved corrosion resistance， which achieved a combination of high strength and excellent corrosion resistance. Firstly， this paper introduced the development of nitrogen-containing stainless steel and martensitic stainless bearing steel. And then it elaborated the mechanism of nitrogen on microstructure， mechanical properties and corrosion resistance. Finally， the current status and development of domestic and foreign nitrogen-containing bearing steel were introduced， and the paper pointed out that the future research and development of nitrogen-containing bearing steel in China need not only the development of different series of new type of steel， but also the fundamental research on microstructure evolution， fatigue property and corrosion resistance mechanism， to promote the production of high-end nitrogen-containing bearing steel in China and to meet the needs of high-end equipment for high-end bearings.
		2017 Vol. 52 (1): 53-63 [Abstract] ( 1809 ) [HTML 0KB] [PDF 0KB] ( 91 )

	64	LI Dong-liang，FU Gui-qin，ZHU Miao-yong，ZHANG He-jia
		Effect of SO2 pollution on corrosion behavior of Q235B steel in hot and humid marine atmosphere
		The effect of SO2 on the corrosion behavior of Q235B steel in simulated marine atmosphere was investigated by XRD， SEM， mass loss analysis and a wet/dry alternate immersion corrosion test using 0.1 mol/L NaCl solution and 0.1 mol/L NaCl＋0.01 mol/L NaHSO3 solution. The results indicate that SO2 pollution significantly increases the corrosion depth of Q235B steel. The corrosion processes of Q235B steel show a good agreement with the power function of [W＝Atn，]and the corrosion products are mainly composed of amorphous phase and a small amount crystals of Fe3O4、α-FeOOH、β-FeOOH、γ-FeOOH. However， the values of parameters [A，][n]and the amount of each crystal are changed before and after SO2 pollution. SO2 and Cl- are synergies in the corrosion process of Q235B steel， but their mechanisms of action are different. Cl－ can prevent the adsorption of corrosion products， and promote them falling， thereby inhibiting the formation of protective rust layer. While SO2 will react with the steel substrate and rust layer during its acidification process， which will lead to the destruction of rust layer structure and the deterioration of corrosion resistance of the steel. In addition， SO2 can inhibit the formation of β-FeOOH and promote the formation of α-FeOOH generated， thereby inhibit the role of Cl－ and improve the stability of the rust layer. However， as the rust layer thickness increases， the inhibition of SO2 reduces， and the inner rust layer becomes loose.
		2017 Vol. 52 (1): 64-70 [Abstract] ( 1628 ) [HTML 0KB] [PDF 0KB] ( 67 )

	71	ZHAO Jia-li，ZHANG Fu-cheng，，YU Bao-dong，LIU Hui
		Bainite microstructure and its tempering stability of 70Si3MnCrMo steel
		The 70Si3MnCrMo steel was treated by austempering and continuous cooling treatment to obtain bainite microstructure. Mechanical properties of the steel were detected via tensile test and impact test experiments. The phase composition and microstructure morphology of the steel were analyzed by XRD， SEM and TEM. Results show that for austempering treatment， the best comprehensive mechanical properties of the steel were obtained when the tempering temperature was 200 ℃， with a product of strength and ductility of 26.4 GPa·%. For continuous cooling treatment， the best comprehensive mechanical properties were obtained when the tempering temperature was 300 ℃， with a product of strength and ductility of 28.6 GPa·%. A carbide-free bainite microstructure composed of bainite ferrite and retained austenite formed in the steel at a relatively low tempering temperature. The ultra-fine bainitic ferrite plate had a ultra-high strength， and the stable residual austenite guaranteed the high plasticity and toughness. Observations show that there were ultra-fine subunits in the bainitic ferrite plate in the steel treated by continuous cooling process. Retained austenites were in shape of film and block possessing different stability， and distributed among the bainitic ferrite plate. The retained austenite gradually transformed to martensite during the tensile process， which made a good combination of strength and toughness， and presented an excellent comprehensive properties.
		2017 Vol. 52 (1): 71-80 [Abstract] ( 1767 ) [HTML 0KB] [PDF 0KB] ( 69 )

	81	ZHANG Liang-liang，，LI Yan，，YU Yang，，GAO Xiao-li，，SUN Chao-fan，，QI Da
		Origin analysis and improvement measures for striped color defects of 780 MPa grade dualphase steel
		The microscopic characteristics of serious color defects on the surface of 780 MPa grade dual-phase steel strip were systematically investigated. The surface condition of defects were studied through SEM and EPMA analysis methods. The results show that the area with color defect was rough and the surface shows the broken topography and there was a positive correlation between the broken intensity and the severity of the color defects. EDS and EPMA proved the existence of slightly oxidization at the broken area. The surface enrichment of the defects was analyzed through GDOES analysis， and the severity of striped color defect was closely related to the depth of enrichment（mainly Si and Mn） peak from the surface. Combined with hot-rolled section analysis， the enrichment has already existed in the form of olivine and its macroscopic state was the red scale defect. The red scale defect was difficult to be wiped off after pickling， the broken intensity and the enrichment depth showed many differences on the surface in different areas after cold-rolling， which finally formed the striped color defects on the surface of annealing plate. Based on the origin analysis， the measurements for hot and cold rolling production have been proposed， which ultimately reduced or eliminated the formation of striped color defects.
		2017 Vol. 52 (1): 81-86 [Abstract] ( 1707 ) [HTML 0KB] [PDF 0KB] ( 58 )

	87	LIU Xue-wei，ZHAO Nan
		Microstructure and properties optimization of hot rolled600 MPa dual phase steel
		The effects of Ti and Nb micro-alloying elements on the microstructure and properties of low-cost 600 MPa grade ferrite-martensite dual phase steel coiled at low temperature were studied by hot rolling trial-production and compared with the dual phase steel coiled at medium temperature. The results showed that the inter-phase precipitation of nanometer （Nb，Ti）C phase mainly distributed along the grain boundaries， synchronously refined the grain size of ferrite and martensite phases， as well as improved the comprehensive strength and plastic properties of the dual phase steel. Thus， it solved the problem of coarse martensite phase formation that existed in the dual phase steel without the addition of Ti and Nb elements. In addition， the modification of the hot rolling process for dual phase steel coiled at medium temperature was proposed under the consideration of its unfavorable characteristics， such as coarse grain size， less martensite content and slightly low strength property.
		2017 Vol. 52 (1): 87-91 [Abstract] ( 1681 ) [HTML 0KB] [PDF 0KB] ( 70 )

	92	DU Feng-shan，YAN Meng，HUANG Hua-gui，CHEN En-ping，WU Xiao-bin,
		Experiment on industrial test platform of high speed piezoelectric shape measuring roll
		In order to improve the online detection precision and the reliability of high speed piezoelectric shape measuring roll，a set of industrialized integrated test platform of high speed Piezoelectric Shape Measuring Roll ("ICP-ITS" for short) was developed to analyze the effect of tension distribution，velocity schedule，load character and other factors on the shape detection signal. For ensuring the accuracy of flatness detection signal，the accurate dynamic calibration and the error measurement were first realized in the platform. On this basis，the platform adopts the strip driving structure and the axially moving press wheel mechanism to simulate the shape of the industrial rolling sheet，which can achieve the simulation of different wave shape and the detection of the shape of the plate. The experimental results indicate that the platform can improve the detection precision，shorten the calibration cycle and have an important practical significance to promote industrial application of the shape meter.
		2017 Vol. 52 (1): 92-97 [Abstract] ( 1597 ) [HTML 0KB] [PDF 0KB] ( 49 )

	98	BAI Zhen-hua，，LIU Ya-xing，LIU Feng，，WANG Rui，QIAN Cheng，DU Jiang-cheng
		Design of strip edge grinding device for finishing line
		In allusion to the burr problem of strip edge tearing zone after cutting edge in finishing line，fully combined with the characteristics of the disc shear device and shearing process，by tracking a large number of field test and theory research，the edge grinding device of the steel strip in finishing mill was designed，which has proved to be effective after field application，and the device can solve the "burr" problem in the strip edge tear zone effectively，and improve the quality of products greatly under the premise of not changing the production equipment and process of finishing unit，which creates greater economic benefits for the unit with further popularization and application value.
		2017 Vol. 52 (1): 98-105 [Abstract] ( 1535 ) [HTML 0KB] [PDF 0KB] ( 41 )

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