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	2007 Vol. 42 No. 9
	Published: 2007-09-15

综合论述

	1	ZHANG Shourong;YIN Han
		Current Situation and Existing Problems of Blast Furnace Ironmaking in China
		In 2006, Chinese steel industry produced 418.78 million tons of crude steel and 404.16 million tons of iron. This paper describes the current situation of Chinese blast furnace ironmaking and the progress achieved after entering the 21st century. The rapid growth of Chinese steel industry has brought about high demand for natural resources and heavy impact on global environment. This paper analyses the existing problems and anticipates the prospect of ironmaking industry in China.
		2007 Vol. 42 (9): 1-0 [Abstract] ( 3026 ) [HTML 0KB] [PDF 0KB] ( 103 )

原料与炼铁

	9	LIU Ran;XUE Xiangxin;HUANG Dawei
		Oxidizing Roasting and Its Mechanism
		The phase transformation and weight loss rate of ludwigite in oxidizing roasting were studied by DTATG, isothermal TG and XRD. The results show that magnetite is transformed into hematite, serpentine is decomposed into forsterite at lower temperature (T＜700 ℃). The dehydration and transformation into suanite of decomposed of szaibelyite at about 700 ℃ is the main reason of ludwigite weight loss. It was found by XRD that paigeite and magnoferrite are the most stable component without phase tromsformation during oxidizing roasting.
		2007 Vol. 42 (9): 9-0 [Abstract] ( 2749 ) [HTML 0KB] [PDF 0KB] ( 119 )

	12	ZHANG Yuzhu;XU Yan;SI Xinguo;ZHANG Qingjun;MA Xuegang
		Research on Size Distribution of Sinters With Different MgO Content
		By studying the size distribution of sinters with different MgO content, the fractal dimension was calculated with a linear correlation coefficients was over 0.97,so, it is to characterize the size distribution of sinters with different MgO content by fractal dimension.The fractal dimension can be used to evaluate the MgO content of sinters quantitatively.With microstructure of the sinter, the relationship between drum strength,yield and fractal dimension of sinters can be explained.The fractal dimension is increased with the MgO content.
		2007 Vol. 42 (9): 12-0 [Abstract] ( 3572 ) [HTML 0KB] [PDF 0KB] ( 103 )

	16	XIANG Zhongyong
		Study on Substitution of BF Bosh Gas Index for Operation Intensity
		By analyzing BF operation data, it was proved that the limitative factor of BF operation intensity is the gas permeability of bosh(bosh gas nidex). Through analysis of factors effecting on BF operation intensity,such as raw material and fuel quality, heat consumed at tuyeres, hot blast temperature, blast oxygen enrichment, etc., it was proved that bosh gas index can be used to represent BF operation intensity.
		2007 Vol. 42 (9): 16-0 [Abstract] ( 3508 ) [HTML 0KB] [PDF 0KB] ( 99 )

	19	WU Shengli;HAN Hongliang;XU Shaobing;NIU Bing
		Study on Mathematical Model for Burden Optimization of Blast Furnace
		On the basis of BF Ironmaking technology, considering expert knowledge of reactions at high temperature among iron bearing materials and softening and melting characteristics of them,an optimal burden model of BF was set up according to the linear programming theory. The calculated burdens were compared with the actual ones.The results show that the model is reasonable and it can be used to realize both smooth operation and cost reduction.
		2007 Vol. 42 (9): 19-0 [Abstract] ( 2705 ) [HTML 0KB] [PDF 0KB] ( 108 )

炼钢

	24	YANG Jun
		Study of Stainless Steel Slab Casting for High Surface Quality
		The slab caster and technology were designed based on metallurgical properties and final applications of stainless steel. The technology was modified during hot commissioning and mass production. Recently, it has been proven that the casting technology is advanced because the slab grinding ratio of grade 304 is on the same level at the reference plant.
		2007 Vol. 42 (9): 24-0 [Abstract] ( 2525 ) [HTML 0KB] [PDF 0KB] ( 98 )

	29	ZHANG Guiyu;WAN Xuefeng;LIN Dong;PENG Fei;ZOU Zongshu
		Application of BOF OffGas Analysis Dynamic Control
		The principle，operation of BOF offgas analysis dynamic control model and measures to deal with excese carbon content at endpoint are introduced.The relation ship between carbon content in bath and decarbonization rate was studied. The conclusions are: To ensure the stability of the endpoint prediction, the lance position should be fixed and no additions should be charged 2 min before blowing end; w［C］<0.04% should be reached with low lance position, or blowing 15 s after cross of CO2 and N2 curves,before deciding whether to raise lance when the carbon content is high at endpoint; Taking into account the impact of lance position on decarbonization rate, the relation ship between carbon content and decarbonization rate at endpoint can be expressed by a cubic function;Thermal equilibrium can be used for predicting bath temperature at endpoint only with stable raw materials supply and operation.
		2007 Vol. 42 (9): 29-0 [Abstract] ( 3208 ) [HTML 0KB] [PDF 0KB] ( 85 )

	32	HAN Zhijun;LIN Ping;LIU Liu;CUI Jingyu;ZHOU Deguang
		Thermodynamics of Calcium Treatment for 20CrMnTiH1
		20CrMnTiH1 is a aluminumdeoxidized resulphurized steel. Normally calcium is added in the last stage of refining process to modify oxides and sulphides to improve the product quality. Based on the thermodynamic equilibrium, the conditions of Al2O3 modification and CaS formation for Ca treated 20CrMnTiH1 steel were discussed in detail. The calculated results show that in the steel melt containing 0.02%0.03%［S］, 0.02%0.04%［Al］ treated by calcium, CaS is easily formed and it is difficult modify Al2O3 into low melting point C12A7. With analysis of the steel sample and blocked nozzle by SEMEDS, it was found that there were CaS and not fully modified calciumaluminate in the steel. Inclusions which caused nozzle blockage during casting were mainly of CaS and CA. The calculation agreed well with the SEM observation. Counter measures to avoid nozzle blockage are proposed.
		2007 Vol. 42 (9): 32-0 [Abstract] ( 2649 ) [HTML 0KB] [PDF 0KB] ( 102 )

	37	LIU Shihong;WANG Xinhua;DAI Guanwen;LIANG Mei;LI Hong
		Investigation on Production of High Purity Hot Forging Steels for Automotives
		High purity hot forged steel for automotives with 0.005% of w(［P］) and less than 0.001% w（T［O］） has been produced by means of increasing hot metal charging ratio, strengthening dephosphurization in EAF, strong direct and indirect deoxidations, etc. It was found that more segregations of C, P, S and Mn occurred at the boundaries between the columnar grains and equiaxed grains. There were mainly two types of nonmetallic inclusions in the steels, which were the MnSMnO typed inclusions and TiNVN typed inclusions. The MnSMnO type inclusions contained 70%81% MnS and were plastic inclusions. While, the TiNVN type inclusions contained 72%85% TiN and were unformable inclusions during hot deformation.
		2007 Vol. 42 (9): 37-0 [Abstract] ( 2767 ) [HTML 0KB] [PDF 0KB] ( 100 )

	41	LIANG Fubin;LIU Xinsheng
		Research on Quality of Continuously Cast ML08Al Billet
		By optimizing the technology of converter steel making of ML08A1 cold heading steel, the morphology of nonmetallic inclusions was modified and product quality was improved.In the trail,the billet quality was inspected and the morphology of nonmetallic in clusions was studied. The measures to improve product quality and steel cleanliness further are brought forward.
		2007 Vol. 42 (9): 41-0 [Abstract] ( 2872 ) [HTML 0KB] [PDF 0KB] ( 107 )

	45	JIANG Min;CHEN Bin;ZENG Tao;BAO Sarina;WANG Xinhua
		Investigation of Cleanliness of NonQuenchandTempered Steel With UltraLow Oxygen Content for Automobile SemiAxis
		Cleanliness of nonquenchandtempered steel with ultralow oxygen content for automobile semiaxis,produced by EAFLFVDCC process was investigated. It was found that several measures should be taken to produce billets with a total oxygen content below 0.0010%. Firstly, the basicity of LF slagw(CaO)/w(SiO2) ratiomust be controlled at 4.0 or higher. As well, (FetO+MnO) content in LF slag should be kept below 1% by control of bottomblown argon flow rate to avoid the pickup of it. Secondly, calcium oxide should be added during vacuum degassing to maintain a high basicity slag, with SiO2 lower than 10%.The time of argon blowing during vacuum degassing should be increased to promote the removal of inclusions from molten steel. Thirdly, reoxidization of the molten steel should be prohibited in the tundish as well as proper casting speed should be used to alleviate or even eliminate the entrapping of tundish slag.
		2007 Vol. 42 (9): 45-0 [Abstract] ( 4554 ) [HTML 0KB] [PDF 0KB] ( 131 )

压力加工

	49	LINGHU Kezhi;YANG Quan;HE Anrui;ZHAO Lin;GUO Xiaobo
		Research of CompleteDecoupling and AntiInterference Combined Control of Shape and Gauge of Strip
		The process of strip rolling is a multivariable process control system.Product quality is influenced by couplings between useful input and output and between interference input and output.By use of a decoupling controller and a feedforward compensator ,the system is decoupled and the interference caused by the disturbance in slab thickness is depressed.The practice showed that the decoupling controller and the compensator have good availability ensuring improved AGC and ASC in combination.
		2007 Vol. 42 (9): 49-0 [Abstract] ( 2742 ) [HTML 0KB] [PDF 0KB] ( 100 )

	53	JIAO Zhijie;LI Jianping;ZHANG Fubo;WANG Lijun;LIU Xianghua;WANG Guodong
		Technological Design of New Type Pilot Cold Rolling Mill
		According to the performance of existing pilot cold rolling mill, and the requirements to the pilot cold rolling mill,a new type pilot cold rolling mill was designed.The cylinders and clamps are used to tension rolling piece. The technology and parameters of this mill are introduced. The experiment schedule should be given first,then the rolling process can be designed according to the layout of the mill. This new type pilot cold rolling mill has been used successfully.
		2007 Vol. 42 (9): 53-0 [Abstract] ( 2645 ) [HTML 0KB] [PDF 0KB] ( 103 )

	56	ZHOU Xiaomin;ZHANG Qingdong;WANG Changsong;WU Ping
		Automative Edge Drop Control System of UCMW Cold Mill and Its Optimization
		Reduction of edgedrop of coldrolled strips is still a problem.The control idea and strategy of AEC(Automation Edge Drop Control) system imported from Japan was studied.Some shortcomings of this control system were brought out,such as invalidation of model prediction ability,improper parameters of feedback control model and imperfection of control strategy making edge drop out of control.The system was optimized. The practical data show that the optimized control system can reduce the edgedrop obviously,especially at the operation side.
		2007 Vol. 42 (9): 56-0 [Abstract] ( 2451 ) [HTML 0KB] [PDF 0KB] ( 133 )

钢铁材料

	60	LI Ani;LI Yong;WANG Chunxu;LIU Xianmin
		Influence of Mo on Secondary Hardening Behavior of UltraHigh Strength AF1410 Steel
		The mechanical properties of experimental AF1410 with 30% Mo aged at different temperature were studied. The results indicated that the experimental steel has obvious effects of secondary hardening with a age hardening peak at 460 ℃,and the hardness was higher than that of original AF1410 steel by 15 HRC.
		2007 Vol. 42 (9): 60-0 [Abstract] ( 2965 ) [HTML 0KB] [PDF 0KB] ( 99 )

	63	SI Yongtao;DONG Ruifeng;LIU Zhe;LIU Yanchun;WANG Guodong
		Production of 540 MPa Hot Rolled DualPhase Strip at Baotou CSP Plant
		Pilot production of 540 MPa hot rolled dualphase strip at Baotou CSP Plant is introduced. 160 t 540 MPa CMn hot rolled dualphase strip was produced by controlled rolling and controlled cooling using laminar cooling and UFC(ultrafast cooling) equipment. The strips have low yield stress, small yield ratio, high elongation, high nvalue and good low temperature impact toughness. No yield point on the tensile curve is observed, the island martensite is distributed among the ferrite grain boundaries uniformly. The produced dualphase steel was used for making beam and frame cover of heavyduty truck at the automobile manufactory.
		2007 Vol. 42 (9): 63-0 [Abstract] ( 3150 ) [HTML 0KB] [PDF 0KB] ( 93 )

	68	NING Baoqun;LIU Yongchang;QIAO Zhixia;YANG Liushuan
		Effect of Stress on Low Temperature Phase Transformation of T91 Ferrite Heat Resistant Steel
		The effect of stress applied at certain temperature on low temperature phase transformation of T91 was studied with Baehr DIL805A/D highresolution differential dilatometer. According to the results of dilatometric measurement and microstructure observation, kinetics of phase transformation was obtained. It was found that the stress promotes formation of martensite and increase of Ms; but the stress applied at different temperature exhibits different effect on Ms: with increase of stress,at 760 ℃ and 650 ℃ Ms decreases, whereas at 440 ℃ Ms is constant at first and increases afterwards. The above phenomena could be accounted for the different inherent phase transformation mechanism: the former is controlled by the morphology of the deformed austenite,the latter is influenced by stress induced martensite transformation.
		2007 Vol. 42 (9): 68-0 [Abstract] ( 2565 ) [HTML 0KB] [PDF 0KB] ( 95 )

	72	WANG Wenxue;YANG Ladao;LIU Zhaowei;WANG Yu;CHI Jinghao
		Study on Relationship Between High Temperature Ｐroperties and Ｂillet Surface Quality of Martensitic Stainless Steel
		The DIL402C thermal dilatometer, STA449C thermal analyzer, Gleeble1500D thermal simulation testing machine were used to study the linear expansion coefficient, major phase transformation temperatures, mechanical properties at high temperature of 2Cr13. The effect of these parameters on surface quality of billet and the mechanism of surface depression and crack formation of billet were analyzed, providing theoretical support for 2Cr13 continuous casting.
		2007 Vol. 42 (9): 72-0 [Abstract] ( 2621 ) [HTML 0KB] [PDF 0KB] ( 122 )

	76	CHAI Feng;YANG Caifu;ZHANG Yongquan;SU Hang;XU Zhou
		Effect of Al and Ti Treatment on Microstructure of CoarseGrain HAZ in HSLA Steel
		The Effect of Al and Ti treatment on coarsegrain HAZ microstructure in HSLA steel was investigated. The results showed that the inclusions in Al treated steel are mainly aluminum oxides and titanium nitrides. Aluminum oxide and Titanium nitride could not promote the formation of acicular ferrite. Microstructure of coarsegrain HAZ of Al treated steels consists of heavy ferrite in grain boundaries and ferrite side plate. The inclusions in Ti treated steel are Al,Ti,Mg,Ca composite oxides with size in the range of 0.53 μm and titanium nitride. Ti composite oxide could promote the formation of acicular ferrite and microstructure of coarsegrain HAZ of Ti treated steel consists of ferrit in grain boundaries, ferrite side plate and large amount of intragranular acicular ferrite.The size of ferrite in grain boundaries is increased and the amount of ferrite side plate is decreased with the increase of soaking time at the peak temperature. The amount of ferrite in grain boundaries and the size of acicular ferrite is increased with the increase of cooling rate during phase formation.
		2007 Vol. 42 (9): 76-0 [Abstract] ( 4039 ) [HTML 0KB] [PDF 0KB] ( 102 )

环保与能源

	81	YU Guangwei;LIAO Hongqiang;QIAN Kai;CAI Jiuju;LEI Yong
		New Method of Disposal of Waste Plastics at Shougang Group
		Nowadays, the cycle of manufacturing and consuming plastic materials has resulted in a serious environmental and economic problem, as called ‘white pollution’ in the world. For this reason, disposal of waste plastics has become increasingly a concern and much efforts for recycling waste plastics have been made. Based on the traditional method of disposing waste plastics by coking process,a new method of cocoking waste plastics and blend coal was proposed by Shougang Group and investigated theoretically and experimentally. The results showed,that the new method not only can increase the content of waste plastics to ≤4% in the charge of coke oven, but also improves the quality of coke if the content of waste plastics ≤2%. The new technology has been proved economical and environmentally friendly to deal with ‘white pollution’.
		2007 Vol. 42 (9): 81-0 [Abstract] ( 3137 ) [HTML 0KB] [PDF 0KB] ( 122 )

装备与控制

	85	WANG Zhiming
		Application of Ovation System in Automatic Control of No.6 of Benxi Steel Blast Furnace
		The application of Ovation automation system on No.6 blast furnace at Bengang Ironmaking Plants is presented. The structure, control mode and program designing concept of system are described. The application of Ovation software,process of logic control,operation of interface are explained with analysis of MASTAION algorithm.
		2007 Vol. 42 (9): 85-0 [Abstract] ( 2591 ) [HTML 0KB] [PDF 0KB] ( 89 )

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