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	2017 Vol. 52 No. 11
	Published: 2017-11-15

	1	CAO Wen-quan，ZHANG Wan-li，XU Hai-feng，，WENG Yu-qing
		Status of superplastic materials and research and development of new superplastic low to medium carbon alloy steel
		Based on the analysis of the ART and status of the superplasticity of metallic materials，the superplastic behaviors of the steels，such as low to medium carbon steel，the high carbon steel，the duplex stainless steel and the austenitic steel，were reviewed and thus superplasticity of the low to medium carbon alloy steel with biggest quantity for application would be one of the important direction of the superplastic materials. The results indicate that the superplasticity of 1 000% failure elongation can be obtained at strain rate of 10－2/s and deformation temperature of 750-850 ℃ in the low cost and low to medium carbon alloy steel. This excellent superplasticity of our newly developed steel could be attributed to the new alloying design and microstructure control to develop ultrafine microstructure. This finding has broken the status that the conventional low to medium carbon steel has no superplasticity，realizes the innovative development of the superplastic low to medium carbon alloy steel with commercial application potential，and thus would initiate its widely application in the fields of communication，aeronautic and astronautic industries.
		2017 Vol. 52 (11): 1-8 [Abstract] ( 449 ) [HTML 1KB] [PDF 0KB] ( 423 )

	9	WANG Rong-rong，ZHANG Jian-liang，LIU Zheng-jian，LIU Yi-ran，LIU Xing-le，LI Nai-yao
		Hardening behavior and mechanism of a new type of binder on cold-bonded pellets
		Binder is essential in cold-bonded pellets， and currently widely used organic and inorganic binders will lose their strength at high temperatures， resulting in a serious decline in pellets’ strength， such as CMC， bentonite and cement， etc. Thus， looking for a type of binder which has great high temperature performance is the key problem needed to be solve. Effects of binder， used in this study， on the compressive strength of the pellets at room temperature and high temperature were investigated，XRD and SEM-EDS were used to study the performance of pellets and raw materials， and the mechanism was also discussed. Results show that the binder exists in a flowing state in cold-bonded pellets， which could adsorb or enclose the iron ore particles.The addition of binder ratio could improve the strength of the pellets at room temperature and high temperature.When pellets are roasted under high temperature and reducing atmosphere，metallization ratio of pellets increases for the reduction of pellets， which results in an increase of the interspace between iron ore particles and a decrease of pellets’ strength. The change of strength and metallization is the most obviously when pellets are roasted for 30-90 min. In the early stage of roasting， strength of pellets does not decrease rapidly as well as pellets using other binders， and pellets could still maintain 100 N/pellet after roasted.
		2017 Vol. 52 (11): 9-14 [Abstract] ( 403 ) [HTML 1KB] [PDF 0KB] ( 385 )

	15	HONG Lu-kuo，QI Yuan-hong，SUN Cai-jiao，GAO Jian-jun，WU Bing-qiang
		Direct reduction of coal based vanadium-bearing titanomagnetite
		In order to investigate the influence factors and reduction behavior of vanadium-bearing titanomagnetite， the influences of reduction temperature， reduction time and[n(C)/n(O)]on the reduction process of carbon composite briquettes of vanadium-bearing titanomagnetite were studied， and the XRD was used for analyzing the reduction mechanism of carbon composite briquettes of vanadium-bearing titanomagnetite. The results show that under certain conditions the metallization rate increases with the rise of reduction temperature， but the metallization rate increases gently after 1 200 ℃， because the reduction reaction of iron oxides becomes gently after 1 200 ℃， and titanium iron compounds are difficult to be broken. With the increase of reduction time and[n(C)/n(O)，]the metallization rate increases firstly and then decreases， because the reduction time lasts too long， the reoxidation of metallized briquettes can not be avoided， and the high[n(C)/n(O)]leads to too much ash in metallized briquettes.It has an effect on reduction process， so the metallization rate of metallized briquettes decreases.
		2017 Vol. 52 (11): 15-19 [Abstract] ( 411 ) [HTML 1KB] [PDF 0KB] ( 430 )

	20	WU Guang-hui，TANG Hai-yan，XIAO Hong，，YAO Hai-ying，ZHANG Jia-quan
		Physical simulation on a 7-strand continuous casting tundish with channel type induction heating
		To solve these problems such as poor consistence between different strands of a 7-strand tundish with channel type induction heating， and short residence time in the 2nd and 6th strands，its configuration was optimized through water modeling. The results of isothermal experiments indicate that the flow characteristics can be improved by changing the channel design and adding two dams at each side of the tundish. Compared with the prototype structure，the average residence time is prolonged by 277.8 s， and the dead zone volume fraction is reduced by 30.16%， which is beneficial to the mixtureof steel temperature and composition， promotethe floatation of inclusions and improve the cleanness of billet.The non- isothermal experiments were performed to simulate the flow in the tundish caused by induction heating. The results indicate that natural convection in the tundish can’t be ignored. The fluid rises up obviously when it flows out from the channel， due to th eaction of buoyancy. The bigger the temperature difference is， the more consistent for different strands of the tundish. For the prototype case， the residence time of fluid is prolonged obviously when the temperature difference between inside channel and outside reaches to 5 ℃， compared with no temperature difference， and the dead zone volume is basically eliminated.
		2017 Vol. 52 (11): 20-26 [Abstract] ( 369 ) [HTML 1KB] [PDF 0KB] ( 424 )

	27	TIAN Jun，WANG De-yong，QU Tian-peng，SU Li-juan，E Xin-rui
		Role and distinction of Ca and Mg to sulfide modification for sulfur steel
		For the purpose of improve cutting property and anisotropy of steels imultaneously， the control of sulfidemorphologywas the key technique for producing free cutting steel.Effect of Mg addition and Ca addition on the composition and diameter of inclusion for the sulfur steel were studied. In the laboratory， the steel was melted by the vertical resistance furnace.One of the steels was treated by Mg， and the other steel was treated by Ca. The samples extracted from the liquid steel were polished and analyzed by scanning electron microscopy and energy dispersive spectrometer. The results show that the steel with Mg addition has tinier oxide inclusions than that with Ca addition. The tiny Mg-Al-O inclusions are the nucleus of MnS in the solidification process of liquid steel. The Mg of composite sulfide （Mg-Mn-S） surrounding oxide core derives from Mg diffusion of the oxide core. The Ca-Al-O oxide of Ca treated steel also could serve as the nucleus of MnS in solidification process of liquid steel. The Ca of composite sulfide （Ca-Mn-S） comes from Ca in the liquid steel. In addition，the mass percent of Ca in the oxide core increaseswith the diffusion of Ca in the composite sulfide.
		2017 Vol. 52 (11): 27-31 [Abstract] ( 551 ) [HTML 1KB] [PDF 0KB] ( 379 )

	32	ZHANG Jian-jun，，ZHANG Hui，XI Chang-suo，TAN Wen，WANG Chun-feng
		Analysis and control of transverse corner cracking formation on middle carbon steel in thin slab casting
		Aimed at transverse corner cracks on middle carbon steel during thin slab casting，the samples with cracks of typical middle-carbon steel（50CrV4） was analyzed through the methods of metallographical observation，high temperature plasticity analysis and numerical simulation about second cooling. The cause of transverse corner cracks on the middle-carbon steel in traditional casting process was that the temperature at slab corner was 850 ℃， which was in No.3 Brittleness Temperature Area between 650-945 ℃. According to the features of caster in WISCO CSP plant，several key measures were carried out，including high casting speed（4.0-4.2 m/min），increasing second cooling water flow rate at the front segment and decreasing second cooling water flow rate at the back segment and edge of slab，and improving the equipment precision. The temperature at slab edge of middle carbon steel increased. Transverse corner cracks of hot-rolled sheets were controlled. Each performance of hot-rolled product can meet customers’ requirements.
		2017 Vol. 52 (11): 32-36 [Abstract] ( 369 ) [HTML 1KB] [PDF 0KB] ( 410 )

	37	SUN Jing-na，CHEN Chi，HUANG Hua-gui，ZHANG Cai-yun，WANG Shuo
		Rolling force model of longitude profile LP plate based on E Orowan differential equation
		The analysis of rolling force of longitude profile LP plate which is a considerable product in steel rolling reduction can provide theoretical basis for optimizing the forming process and predicting product performance. Based on E Orowan mathematical model and shear friction，the stress expression in each deformation zone of the longitude profile LP plate was derived. The change rule of the rolling force in the deformation zone was observed by the variations of rolling parameters. The results are as follows：the inlet positions of cladded longitude profile rolling and the rolling force peak are related to rolling reduction while the outlet position is determined by the rolling wedge angle. The rolling force peak and the deformation zone size reduce with the increase of wedge angle and time in the upwards rolling. Conversely， the rolling force peak and the deformation zone size raise with the increase of wedge angle and time in the downwards rolling.
		2017 Vol. 52 (11): 37-42 [Abstract] ( 419 ) [HTML 1KB] [PDF 0KB] ( 433 )

	43	LI Xia，WANG Xi-gang
		Effects of strip running speed on microstructure and properties of TRIP steel
		It is significantly important to research the effects of strip running speed on the structure and properties for improving productivity of iron and steel enterprise. With phase transformation induced plasticity steel TRIP 590 as an example，the annealing experiment was carried out at the speed of 80，100，120 and 140 m/min，and the tensile tester and scanning electron microscopy was used to analyze the influence of different speed effects on the micro structure and properties. The conclusion can be reached that，with the increase of the strip running speed，the ferrite content in the steel reduces，the contents of the martensite and bainite content increase and grain size increase gradually. At the range of 100-120 m/min，the phase ratio，grain size and properties reach the ideal value. Especially at the speed of 120 m/min，the content of residual austenite and the carbon is higher，and the micro structure and properties reach the optimum value. The strength and elongation of the product are obtained at 21 GPa·%，which matches the TRIP effect of improving the strength and plasticity index at the same time.
		2017 Vol. 52 (11): 43-46 [Abstract] ( 343 ) [HTML 1KB] [PDF 0KB] ( 441 )

	47	ZHAO Cheng-zhi，LI Hong，ZHANG He-xin，ZHANG Ze-cheng，REN Jiang-bo
		Effect of[w(Al)]on organization and heat-plastic deformation of novel heat-resistant steel
		Using the means of JmatPro material performance simulation software combined with experimental research，the microstructures of three kinds of ZG1Cr10NiAlMoVNbN heat-resistant steels with different[w(Al)]after normalizing and high-temperature tempering were studied. Three kinds of test steels were simulated at room temperature and the fracture mechanism was analyzed according to the tensile test data and fracture morphology. The results show that the simulation results are in good agreement with the experimental results. With the increase of[w(Al)]in the steel，the fracture mechanism changes from microporous aggregated fracture to quasi-cleavage fracture and cleavage fracture. Combined with microstructure analysis，the[w(Al)]is the main factor on the carbide type，shape and distribution.
		2017 Vol. 52 (11): 47-51 [Abstract] ( 392 ) [HTML 1KB] [PDF 0KB] ( 384 )

	52	LIU Hui，，，WANG Yang，，，SUN Qing，ZHU Jing-tao，FU Jian-xun，，
		Analysis on delaminating of tensile fracture for 700 MPa beam steel
		The mechanical properties of the 700 MPa beam steel hot rolled plate were tested， confirming the phenomenon of delamination in the tensile fracture. Metallographic microscope， Scanning electron microscope with energy dispersive spectrometer （SEM-EDS）， transmission electron microscope with energy dispersive （TEM-EDS） were used to investigate the layered fracture. The average yield strength and tensile strength of this steel were 766.9 and 839.0 MPa respectively with average elongation of 19.2%，which meets the requirement of the performance. The results of the study shows that the inclusions and precipitates were finely distributed in slab and rolled products， which， however， is not the main cause of the delamination phenomenon. The bainite and M-A island were zonal distributed along the middle of the thickness-direction of the hot rolled plate， resulting in the discrepancy of plastic property， which is the direct cause of delamination phenomenon. The delaminating of tensile fracture for 700 MPa beam steel were analyzed and the improvement direction of actual production was proposed.
		2017 Vol. 52 (11): 52-58 [Abstract] ( 426 ) [HTML 1KB] [PDF 0KB] ( 424 )

	59	XIE Xue-tao，HE Bo-lin，JIN Hui，WU Jian
		Effects of ultrasonic impact treatment on very high cycle fatigue properties of P355NL1 steel welded joint
		The effect of ultrasonic impact treatment （UIT） on very high cycle fatigue properties of P355NL1 steel welded joint was investigated through ultrasonic fatigue test and UIT test. The results show that the[S-N]curve of the fatigue life，in the 105-109 cycles range，the fatigue properties of impact specimens are higher than that of the as-welded specimens. Under the fatigue life of 1.0×108 cycles，the fatigue strength of as-welded specimen is 139 MPa，the fatigue strength of treated specimen is 217 MPa，the fatigue strength of the treated specimen is improved by 156% compared with the as-welded specimen. This shows that UIT can significantly improve the fatigue strength of welded joint. The fracture surface was observed using scanning electron microscope （SEM），it can be found that the crack is initiated in the welded root surface of specimen. The fatigue fracture of P355NL1 steel welded joint is quasi cleavage fracture. The UIT can improve the fatigue strength of welded joint，but it will not change the fatigue failure mechanism. UIT can reduce the stress concentration at the weld root，and bring in the beneficial compressive stress and the surface grain refinement，so as to improve the fatigue strength of the welded joint.
		2017 Vol. 52 (11): 59-63 [Abstract] ( 326 ) [HTML 1KB] [PDF 0KB] ( 380 )

	64	JIANG Xi，，BAI Xing-quan，ZHOU Dong-dong
		Injection of coke dry quenching dust in blast furnace
		The main characteristics of ironmaking in China are high costs of the hot metal and the low circulation utilization rate of the solid waste resources. For instance，the coke dry quenching dust，which was produced in the coking process，has not utilized effectively for a long period. Thus，the injection of coke dry quenching dust in blast furnace not only could reduce the smelting costs，but also could relief the short of the anthracite and benefits to the environment protection. The technical feasibility to use the coke dry quenching dust replace some high cost anthracite was analyzed by analyzing the burnout rate，grinding performance and coal ignition point，while the industry experiments were conducted in the blast furnace in Jiusteel. In addition，some measurements for injecting the coke dry quenching dust were proposed. The study could contribute to reduce the costs of hot metal，improve the utilization of waste resources as well as the energy conservation and emission reduction.
		2017 Vol. 52 (11): 64-68 [Abstract] ( 463 ) [HTML 1KB] [PDF 0KB] ( 458 )

	69	ZHANG Zun-qian，ZHANG Yu-zhu，XING Hong-wei
		Centrifugation fiberization experiment of molten slags and influencing factors of fiberization
		In order to analyze the fiberization mechanism of melting slag and its influencing factors. The fiberization process of molten BF slag was studied experimentally through centrifugal method. Combining the experimental results， factors influenceing the length and the diameter of blast furnace slag fibers were investigated， and the influence of such parameters as roll diameter， roll speed and outlet slag temperature on the centrifugal spinning process and the obtained fibers were also analyzed. Under the experimental conditions， the optimum tapping temperature was 1450 ℃， the four rollers speed of the four-roller centrifuge were 3 840，4 620，5 220 and 5 820 r/min respectively. The results show that the We number and the Oh number of the molten slag must reach 4.223×106-4.28××106 and 3.81×10－2-4.56×10－2 respectively to produce a fibrosis decomposition. The two parameters reflect the relationship among the factors that affect the fibrosis of the slag and finally the expression of fiber diameter and fiber length in the test condition are determined.
		2017 Vol. 52 (11): 69-74 [Abstract] ( 406 ) [HTML 1KB] [PDF 0KB] ( 435 )

	75	DU Feng-shan，FENG Yan-feng，LIU Wen-wen，SUN Jing-na，WANG Hai-jun
		Measuring technique for roll profile electromagnetic control in precision plate rolling
		The roll profile electromagnetic control technology is an emerging method to control roll shape through electromagnetic roll adjustment.Based on the fact that circumferential strain equals to radial strain on the roll surface， a new method of roll profile electromagnetic control technologywas proposed and detailed， and the method could be used for for measuring electromagnetic control roll crown variation with time in idle state. In this paper， in order to verify the feasibility of this method， a roll profile electromagnetic control experimental platformwas designed and built， and then the experiments were carried out.The experimental results were comparedwith the measurements forradius variation of the roll midpoint by using a dial gauge. The comparison shows that the method is able to precisely achieve the real-time measurement of the electromagnetic control roll in idle state， thereby further demonstrating the change for the electromagnetic control roll profile under different conditions.The new measuring approach lays a foundation for the further modeling of the relationship between the process parameters and the roll profile adjustment.
		2017 Vol. 52 (11): 75-80 [Abstract] ( 336 ) [HTML 1KB] [PDF 0KB] ( 347 )

	81	WANG Tao ，HUANG Qing-xue，SHEN Guang-xian，ZHENG Yong-jiang
		Analysis on problem of plate biting and roll shifting in four-high rolling mill
		At present， the four-high rolling mills used in the hot rolling lines have the phenomenon that the work roll bites the plate and shifts along the axial， called the "plate biting and roll shifting". According to the "microscale statically determinate" design theory， the small gap between the roll bearing and the rolling mill window "about 1 mm" （with the liner wear increased） makes the roller system in indecisive state， and leads to the roll misalignment and cross. Sounder certain conditions， the phenomenon of plate biting and roll shifting will occur. The original theory of offset distance in rollers ignores the necessity of controlling tiny gap. In the current study， the method for avoiding the plate biting and roll shifting is the scientific control of the "unavoidable gap". The intelligent liner is developed to ensure the rolling mill roll parallel， stable positioning and reliable operation， eliminate the energy consumption of plate biting and roll shifting， make full use of high-grade rolling mill capacity， apply large pressure rolling new technology， produce high-strength new varieties， and achieve the upgrading of 4/6 hot/cold rolling mill and the purpose of low cost and high yield.
		2017 Vol. 52 (11): 81-86 [Abstract] ( 358 ) [HTML 1KB] [PDF 0KB] ( 352 )

	87	WANG Xin-dong，ZHAO Jun，ZHANG Qian
		Practice of national strategy “the Belt and Road Initiative”， set a successful example of “going out”
		HBIS Group Serbia Company is the first steel project purchased by Chinese enterprise in Europe under the strategy of “the Belt and Road Initiative”. The general situation of the project is described，such as the main equipment，technique and process，product categories and so on. It also emphasizes that，since Serbia steel plant was taken over，HBIS group has taken various kinds of effective measures such as all-around management input，comprehensive process improvement and global superior resource allocation，to quickly reverse the passive dilemma for years of loss，and within only half a year，enabled the company to be dynamic again. On this basis，the future development strategy is designed systematically，combined with the actual situation of the company. This major historic change of HBIS Group Serbia company is its real reflection of taking “represent national industry，play the role of state” as its mission，and carrying out the national strategy of “the Belt and Road Initiative”，which has great significance of reference and demonstration，for state-owned enterprises to realize “going out” strategy.
		2017 Vol. 52 (11): 87-91 [Abstract] ( 395 ) [HTML 1KB] [PDF 0KB] ( 430 )

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