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	2016 Vol. 51 No. 12
	Published: 2016-12-15

	1	QIU Sheng-tao，WANG Hai-jun，RONG Zhe，XIANG Li，FU Bing
		Technology analysis and research status on grain-oriented pure iron
		The grain-oriented pure iron is a kind of magnetic iron with (110)[001] texture. For higher magnetic induction， lower coercive force and higher DC magnetic， it is widely used to manufacture magnetic shield， electromagnets， especially for the transformers and motors working under high magnetic field. In this paper， the production and the technology of grain-oriented pure iron all over the world were summarized， and the production technical characteristics of different manufacturers were also analyzed. A comprehensive analysis of current data about grain-oriented puree iron， its magnetic induction is[B800＝]1.80～1.91 T， only several patent by Nippon Steel reported[B800＝]1.92～2.03 T. Thus， there is still much room for improvement comparing with pure iron which saturation magnetic flux density is 2.16 T (theoretical saturation magnetic induction of pure iron). Simultaneously， there are no systematic research on secondary recrystallization behavior and inhibitors control of grain-oriented pure iron.
		2016 Vol. 51 (12): 1-7 [Abstract] ( 748 ) [HTML 0KB] [PDF 0KB] ( 51 )

	8	CHEN Zi-luo，ZHANG Jian-liang，ZHANG Ya-peng，YAN Zhi-wu，WANG Dong，，GAO Bin
		Influence of basicity and[w(SiO2)]on sinter mineral quality
		The suitable[w(SiO2)]and basicity of sinter to guide the production of sinter with good technical and economic indexes was studied. Firstly， the analysis of basic sintering properties iron ore powder used in Qingdao Special Steel Co.， Ltd. was analyzed. Furthermore， on the basis of practical production， sinter pot tests were conducted by varying the binary basicity and the content of SiO2 in sinter to study the effects of the two factors on the technical and economic indexes of sintering. The results showed that the optimal parameters were the binary basicity of 1.9 and[w(SiO2)]of 5.4%. In the microstructure of sinter， it was found by scanning electron microscope that the higher content of SiO2， the larger liquid phase and dissolution textures and the more homogeneous chemical composition. However， when[w(SiO2)]was higher than 5.7%， the quality of sintering became degraded because of the over-developed of silicates. The increase of binary basicity is conducive to the development of calcium ferrite and the increase of liquid phase amount， thus increasing the reducibility of sinter， improving the quality of sinter. But the increase in glass phase would happen when the binary basicity reached 2.0.
		2016 Vol. 51 (12): 8-14 [Abstract] ( 842 ) [HTML 0KB] [PDF 0KB] ( 50 )

	15	QIAN Hui，XIE Wei，，XIA Jie，，CHEN Yan-qiu，
		Correlationship between strength index， reactivity and reflectance of coke
		The mean maximum reflectance[Rmax]and mean bireflectance[Rbi]can be measured automatically by controlling the angle of polarizer of microscope. By means of regression analysis， significant the correlationships were found between[Rmax]and coke reactivity CRI， and coke strength after reaction CSR as well. The values of[r]were －0.926 and 0.949， respectively. The correlationship between[Rmax]and coke mechanical strength[DI15015]was weak obviously， the[r]of which was only 0.704. No obvious correlationship was found between[Rbi]and any other coke property index.
		2016 Vol. 51 (12): 15-19 [Abstract] ( 693 ) [HTML 0KB] [PDF 0KB] ( 70 )

	20	WANG Yuan-sheng，，XUE Gai-feng，，BAO Jun-fang，，REN Yu-ming，
		Analysis on residual coke during medium maintenance of No.6 blast furnace of Wusteel
		In order to further study the deterioration behavior of coke in the blast furnace， and to explore a more suitable evaluation index of coke， the coke was took out from the furnace top and down in a hierarchical way during the medium maintenance， the physical and chemical properties of coke after reaction at high temperature were determined and analysed. The moisture， ash， volatile components， of coke was determined by Kaiyuan 5E-MAG6700 full automatic workpoint instrument， the apparent porosity was determined by Kexiang XQK-2000 apparent porosity measuring instrument. The research results show that the coke ash content of residual coke in the furnace was higher than that at the furnace feeding， the fixed carbon content decreased obviously. The pores of coke retained a large number of slag. The contents of SiO2， Al2O3， CaO， MgO of primary slag were not high， while the contents of MnO and Fe2O3， P2O5 were several times or even ten times than those in end slag， there was a considerable part of the slag in the lower part of the hearth. The maxim um enrichment amount of alkali metal K and Na lay between the lower part of bosh and the top part of hearth， the maximum enrichment amount of Zn located at the top part of hearth. Through the research and analysis of the residual coke in the blast furnace， the understanding of the behavior of coke in the blast furnace is more profound， and the characteristics of the blast furnace is more easy to be understood， which can be used to guide the production in blast furnace.
		2016 Vol. 51 (12): 20-24 [Abstract] ( 700 ) [HTML 0KB] [PDF 0KB] ( 52 )

	25	CHENG Zhong-fu，ZHU Miao-yong
		Penetration behavior of molten steel into slot plug used for refining ladles
		The mechanism of molten steel penetrating into slot plug applied for refining ladle was analyzed， and a mathematical model describing the penetration behavior was established by considering the energy conservation and momentum conservation of the molten metal in the slot. Dynamic behaviors of molten steel penetrating into slot were researched， and the calculated results were compared with experimental data. It is found that the failure of additional pressure against static pressure is the major cause of penetration. Once the penetration occurs， molten metal would rapidly penetrate into the slot plug in short time. During this period， there exists an unsteady penetration stage as the slot length is much larger than the width. Then it reaches the maximum penetration depth. The investigation provides a basis for designing slot plug to prevent from penetration applied for bottom powder injection.
		2016 Vol. 51 (12): 25-30 [Abstract] ( 685 ) [HTML 0KB] [PDF 0KB] ( 49 )

	31	SHEN Ping，ZHANG Li-feng，YANG Wen，WANG Yi
		Wettability and penetration phenomenon between LF refining slag and MgO-C substrate
		In order to investigate the wear mechanism of MgO-C brick from the point of wettability， the sessile drop method was employed to measure the contact angle between liquid and solid phase. The wettability between MgO-C substrate as well as two main components in the substrate and LF refining slag was studied. At the refining temperature， graphite substrate was not wetted by the molten slag， and the lower temperature it was， the more non-wetting it became. While the MgO component was completely wetted by the slag. There was an obvious turning point of contact angle between molten slag and MgO-C substrate in the range of 1 460 ℃ and 1 480 ℃. Below the turning point， the reaction between MgO and C was restrained for the lower temperature， and the MgO-C substrate kept un-wetted by molten slag. Above the turning point， the MgO reacted with carbon， and Mg vapor and CO gas were generated. The carbon content was reduced for the reaction， leading to the fast decrease of contact angle between molten slag and substrate. Once the contact angle was smaller than 90°， the molten slag penetrated into the substrate. The pores formed by the reaction between MgO and carbon became the main channel for the penetration of slag. When the slag penetrated into the substrate and reached at the interface of unreacted layer， the non-wetting property between the slag and unreacted layer and few pores prevented the further penetration of slag.
		2016 Vol. 51 (12): 31-40 [Abstract] ( 643 ) [HTML 0KB] [PDF 0KB] ( 63 )

	41	XU Tao，ZOU Chang-dong，ZHAO Jia-qi，LIU Fei
		Analysis on stopper rod erosion mechanism and improvement for aluminum bearing cold heading steel
		The cause of stopper rod erosion and improving measures have been presented by analyzing the materials of stopper refractory，observing the element distribution within the erosion layer and the thermodynamic calculation. The research results show that the main reason for the stopper rod erosion was the high mass of C and SiC in the stopper rod refractory and the calcium-aluminates with low melting point produced by the reaction of high persent [Ca] in the liquid steel and Al2O3，SiO2，C in the stopper rod refractory，and the stopper rod erosion can dramatically be reduced by adjusting calcium treatment and replacing magnesia carbon stopper rod refractory. Through these improving measures， the working life of stopper increased from 286-824 min to 460-1 020 min，the average working life increased from 495 min to 802 min，the problem of stopper rod erosion has been basically solved.
		2016 Vol. 51 (12): 41-46 [Abstract] ( 703 ) [HTML 0KB] [PDF 0KB] ( 70 )

	47	ZHANG Long，WANG Dong-cheng，，MA Xiao-bao，WANG Zhi-jie，ZHANG Shuai
		Improvement measures of roll’s curve grinding precision for cold strip mill
		The optimization of roll profile is an effective way to improve the rolling mill’s flatness and thickness profile control ability. However，the ability and precision of grinding machine is limited，so the deviation between the object roll profile and the actual grinding profile is inevitable，which will weak the application effect of roll profile. Aimed to the problem，the deviation distribution regularities are analyzed，and then two improvement measures including the offset and tilt compensation of targeted roll profile are put forward，which reduces significantly the mean square error between the object roll profile and the actual grinding profile，and the asymmetry of roll profile is basically eliminated，so the application effect of roll profile is improved. The results provide valuable reference for grinding roll profile with fixed deviation pattern.
		2016 Vol. 51 (12): 47-52 [Abstract] ( 667 ) [HTML 0KB] [PDF 0KB] ( 63 )

	53	DENG Qi-zhi
		Production technology and product variety development of HRB400E fine-grained hot rolled reinforcing bar
		The rolling technology of fine-grained reinforcing bar can make full use of the performance of steel material，reduce the consumption of the rare alloy metal at home，and achieve the goal of saving resource. Based on the chemical component of 20MnSi，the current study adjusted chemical composition，used the continuous rolling production line and equipment available in Fushun New Steel Co.，Ltd. to successfully produce the fine-grained hot rooled reinforcing bar with diameter of 16 mm and 20 mm. The controlled rolling and controlled cooling technology were applied to control the deformation，deformation temperature, deformation rate and cooling rate.The grain size of ferrite within the bar was less than Grade 9. The test results showed that the controlled rolling and controlled cooling process could be able to produce HRB400E with fine grains, the production regulations of the HRB400E fine-grained hot rolled reinforcing bar also had been specified in this paper.
		2016 Vol. 51 (12): 53-57 [Abstract] ( 670 ) [HTML 0KB] [PDF 0KB] ( 65 )

	58	YU Hui，LIU Li-gang，WANG Xiu-lin，HUANG Hong-tao，FENG Qing
		Cooling phase transformation and numerical simulation of nuclear steel P280GH
		In order to study the phase transformation of P280GH steel nuclear power tube during cooling process after hot-roll process， the CCT and TTT transformation kinetics curves were measured by using physical simulation method. The results show that coarse ferrite and pearlite form at low cooling rates and the low-temperature microstructure phase can be reduced by increasing the cooling rate. When the cooling rate is more than 10 ℃/s， bainite begins to appear. Based on the superposition principle， the numerical model of the cooling process of the test steel is established by using the finite element method. The temperature field and the evolution of phase transformation along the direction of the wall thickness of the P280GH steel specimen with dimensions of [?219.1 mm]×18.26 mm were analyzed for air cooling and water cooling， respectively. The results show that the microstructure under air cooling condition is homogeneous pearlite， and there is no bainite and retained austenite. The microstructure under water cooling condition is martensite， and the difference between the internal surface and the external surface was 3.6%， which is basically consistent with that of the actual heat treatment. The research results can provide guidance for the cooling process of hot rolling P280GH steel pipe production.
		2016 Vol. 51 (12): 58-64 [Abstract] ( 651 ) [HTML 0KB] [PDF 0KB] ( 49 )

	65	XU Yong，，ZHAO Gang，，XIAO Huan，
		Influence of cold-rolling reduction ratio and normalizing process on primary recrystallization texture of Hi-B steel
		The influences of different cold-rolling reduction ratios (63.8%，75.2%，87.1%) and normalizing (two-stage normalizing) process on primary recrystallization (820 ℃， 5 min) of Hi-B steel which took Cu2S and AlN as inhibitor manufactured by stimulating CSP process were studied by electron back-scattered diffractionNOVA400 Nano field emission scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) (EBSD). The analysis of texture was based on three aspects： grain-oriented， PDF cross section of[φ2＝45]and density of orientation lines. The results show that the micro-structure of specimens which has been primary recrystallization annealed after normalizing is more even， {111}〈112〉 and Goss textures are more relatively. Textures transforms， and the conversion products are mainly {111}〈112〉 texture which benefits the formation of Goss texture. When the reduction ratio is 87.1%， the structure has favorable grain orientation and suitable orientation line distributed.
		2016 Vol. 51 (12): 65-69 [Abstract] ( 580 ) [HTML 0KB] [PDF 0KB] ( 70 )

	70	AN Zhi-guo，HUANG Yan-xin，HOU Huan-yu，CHEN Hong-wei，LIU Yan-li，SHI Yuan
		Continuous cooling transformation of bainite non-quenched and tempered steel for automobile front axle
		Microstructure evolution of bainite non-quenched and tempered steel for automobile front axle during continuous cooling transformation was studied by DIL805L thermal dilatometer. The influences of alloy elements and cooling rate on the continuous cooling transformation curves， microstructure and micro-hardness of the steel were analyzed. The results show that alloy elements， such as Mn， Si， Cr， V and B in FAS2225 steel， were favorable for getting bainite in a wider range of cooling rate， and the transformation zones of pearlite and bainite were separated in the CCT diagram. Bainite can be obtained above the cooling rate of 0.1 ℃/s. With the increasing of cooling rates， the Vickers hardness of experimental steel increased， but the increase amplitude has changed significantly at the cooling rate of 0.1 and 2 ℃/s.
		2016 Vol. 51 (12): 70-73 [Abstract] ( 702 ) [HTML 0KB] [PDF 0KB] ( 52 )

	73	YE Jie-yun，AN Gui-huan， LIU Shan-shan，LIU Wei-ning，WANG Zhi-gang
		Effect of hot-rolled coiling temperature on microstructure，properties and textures of micro-carbon deep-drawing DP steel
		In order to study the charge rule of texture on deep-drawing DP steel， effect of hot-rolled coiling temperature on microstructure， properties and textures of micro-carbon deep drawing DP steel were studied by OM，TEM and XRD technical. The research shows that： microstructure of hot-rolled plates is mainly composed of ferrite and pearlite. With the increasing of coiling temperature， the grain size of ferrite increased slightly， and elongation of hot-rolled plate enhanced gradually. The optimum precipitation temperature of Mo-based carbide in hot-rolled plate is 700 ℃. A higher volume fraction (4%) of martensite and finer (11.7 μm) ferrite observed in annealed sheet on 700 ℃ coiling compared with 650 and 750 ℃. Meanwhile， the strongest 〈111〉//ND fiber texture and weakest {001}〈110〉 texture achieved in annealed sheet. The tensile strength and r value of annealed sheet on 700 ℃ coiling reach to 455 MPa and1.5， respectively.
		2016 Vol. 51 (12): 73-79 [Abstract] ( 787 ) [HTML 0KB] [PDF 0KB] ( 80 )

	80	LIU Hong-qiang，ZHANG Fu-ming，，LIU Si-yu，FU Jian-xun
		Green low-carbon analysis of iron and steel manufacturing process of Shougang Jingtang Iron and Steel Company
		Resources and energy shortages， market declining profitability and ecological and environmental constraints have become three aspects of the pressures and challenges in China’s steel industry. Low-carbon and circular economic became the main trends in current social development， and iron and steel enterprises should upgrade to the direction of low-carbon and green steel production. This paper was based on the production survey in the first half of 2015 year in Shougang Jingtang Company. Energy consumption and CO2 emissions in the steel production process were calculated. The energy flow operation， waste treatment and energy conversion in iron and steel production process were analyzed. Also， references were provided for other steel companies to reduce carbon dioxide emissions， save energy and protect environment. Studies had shown that comprehensive energy consumption and CO2 emissions for per ton of steel were 604.5 kg and 2.165 t， respectively. Compared with Baosteel and Wuhan Iron and Steel with similar product structure， the energy level of Jingtang Steel located in the advance level. Based on the energy flow analysis of steel production， Shougang Jingtang Company used the CDQ， TRT and other advanced technology. The waste heat and energy recovery achieved 136.26 kg/t steel， and the recovery rate of waste heat and energy was 48.31%， which was 10.89% higher than the national average value. Based on the cycle thought， Shougang Jingtang Company established the efficient gas-electric energy conversion center and steam heat recycling center， and basically realized zero emissions and comprehensive utilization of coal gas， solid waste and water resources and discharged SO2， NO2 and other pollutants.
		2016 Vol. 51 (12): 80-88 [Abstract] ( 1010 ) [HTML 0KB] [PDF 0KB] ( 67 )

	89	TANG Fu-ping，YU Shu-juan，QIAN Feng，HOU Hong-yu，WANG Xiao-feng，MA Xian-guo
		Research and practice on self-reductive dezincification of composite dust pellet
		The utilization of metallurgical solid wastes is a major task for the steel industry in the 21st century，the removal of harmful elements from metallurgical solid waste and the recovery of helpful elements are the key technologies. In this experiment，a new technique of deoxidation of zinc from metallurgical wastes was proposed，the metallurgical dusts were made into composite pellets with double-layer structure，self-reductive micro-cracking test and industrial application tests were carried out. The results showed that the composite ball was added into the torpedo tank，and the reduction effect was achieved. The composite ball was self-reduced and micro-cracked by the waste heat of hot metal ladle and molten iron heat，which provided the dynamic conditions for the reduction reaction，and realized the high efficiency comprehensive utilization of the iron and zinc dust.
		2016 Vol. 51 (12): 89-93 [Abstract] ( 656 ) [HTML 0KB] [PDF 0KB] ( 69 )

	94	WANG Rui，，BAI Zhen-hua，，WANG Yun-xiang，，LIU Ya-xing，，QIAN Cheng，，HUA Chang-chun
		Strip hot buckling index and its influence factors in continuous annealing process
		In allusion to the problem of strip hot buckling in continuous annealing process（CAP）， taking the equipment and technological characteristics of CAP into account， the mechanism of hot buckling and transverse compressive stress from the factors of internal force and external force were analyzed. Basically， the study described the occurrence law of strip hot buckling and firstly put forward the concept of buckling index. Based on above results， the critical buckling condition was presented， and the calculation model of strip buckling index in continuous annealing process was established. The strip buckling index distribution in different processes and the influences of incoming strip shape， transverse temperature difference， roll profile， friction coefficient， tension setting， strip traveling speed on the strip hot buckling index in continuous annealing process were analyzed quantitatively. The related theory was applied to the production and practice. The predictive software of strip buckling in continuous annealing process was developed and the strip buckling was on-line predicted timely， which can lay a solid foundation for the prevention and control of strip buckling defects.
		2016 Vol. 51 (12): 94-102 [Abstract] ( 795 ) [HTML 0KB] [PDF 0KB] ( 62 )

	103	ZHANG Ming，PENG Yan，SUN Jian-liang，ZHANG Yang
		Test of vibration on F2 of 2 160 mm hot strip mill
		In order to solve the intensive vibration problem during thin products rolling， comprehensive vibration test on the stand F2 of 2 160 mm hot tandem rolling mill system has been carried out in this paper. First， the vibration phenomenon was introduced and the type of this vibration was analyzed. Then， a new rolling interface friction model was established by considering the dynamic characteristic of the rolling interface， which could characterize the positive and negative damping effect of the interface. More explicitly， the coupled vibration model with torsional vibration and horizontal vibration was established based on the above model with different movements between the upper and lower roll system. Based on the built model， the self-excited vibration was simulated in the hot rolling. It is found that the upper and lower work roll moved reversely in both torsional and horizontal directions， and the vibration frequency was the first-order natural frequency of torsional vibration， which was consistent with the measured phenomenon. Finally， the influences of the rolling parameters on the self-excited vibration were analyzed， and the corresponding feasible suppression measures of vibration were proposed.
		2016 Vol. 51 (12): 103-106 [Abstract] ( 671 ) [HTML 0KB] [PDF 0KB] ( 77 )

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