Tangshan, China
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Zhao D.,Hebei United University | Li J.,Tangshan Iron and Steel Co. | Wang S.,Hebei United University | Liu H.,Tangshan Iron and Steel Co. | And 2 more authors.
Advanced Materials Research | Year: 2012

The paper analyzed the sulfur in steel for civil engineering in 150t converter in TangSteel. Based on the analysis of desulfurization process and the thermodynamic conditions in converter, the operation of desulfurization was optimized. The industrial tests for desulfurization were carried out, and the results were analyzed. The results were shown that the distribution coefficient would be the highest value, when the alkalinity of slag was 3.5 and the FeO content was 21% in making SPHD steel. The distribution coefficient would reduce, when the temperature was increased, especially more than 1700°C, so end point temperature should be best less than 1700°C. © Trans Tech Publications, Switzerland.


Feng Y.,Hebei United University | Cai M.,Hebei United University | Chen L.,Tangshan Iron and Steel Co.
Advanced Materials Research | Year: 2012

It was analyzed by metallographic observation and X-ray diffraction method that the microstructure and texture in two kinds of Ti-IF steels, which produced by different hot rolling process,and it also was discussed that the formability and the texture in Ti-IF steels. The results showed that the microstructures of these two kinds of steels are Equiaxed ferrite grains, but the grain sizes are greatly different. Respectively the average grain size of steel A and B are 24.85μm and 11.85μm, and the average grain size number are 7.4 and 9.5. The {111} texture of steel B is stronger than A, besides, the deep drawing properties of steel B is better than A in the reason that disadvantaged texture{001}<110> and {112}<110> are not founded in steel B. © (2012) Trans Tech Publications, Switzerland.


Zhao D.,North China Electrical Power University | Chen X.,Tangshan Iron and Steel Co. | Zhang X.,North China Electrical Power University
Dianwang Jishu/Power System Technology | Year: 2011

The phasor measurement unit (PMU) based wide area measurement system (WAMS) provides a new thought and method for online voltage stability prediction. Adopting the π-type of branch model and by use of synchronous phasor measurement data, the voltage stability index based on branch power flow that can be used to HV power network is derived. In the viewpoint of physical meaning, the derived index can be explained as virtual active power margin index IVAM and an improved real-time voltage stability prediction index, which considers the IVAM variation of a certain tie line, is proposed. Calculation results of IEEE 14-bus system and that of a certain provincial power network show that the proposed index is accurate. The proposed improved voltage stability prediction algorithm is accurate and simple in structure, and it is easy to realize its online application.


Han B.,Tangshan Iron and Steel Company | Li X.,Tangshan Iron and Steel Company | Sun H.,Tangshan Iron and Steel Company | Xia M.,Tangshan Iron and Steel Company
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

As a deep drawing steel grade, excellent formability of IF (Interstitial Free) steel is closely related to its chemistry and microstructure. Coarse precipitates and ferrite grain size are beneficial to the texture formation after hot rolling, cold rolling and annealing. But oversized precipitates are detrimental to the finished product formability. This paper examines the TiN formation process during casting. It was found that the TiN particle takes two kinds of nucleation mechanisms, namely homogeneous and inhomogeneous. The former nucleates on Al2O3 particles and the latter is attributed to the chemical segregation during solidification. Superheat of liquid steel influences the TiN particle size.


Shao J.-H.,University of Science and Technology Beijing | Shao J.-H.,Tangshan Iron and Steel Co.
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2015

By using a thermal-state visualizable fluidized bed, the sticking of iron ore fines with different particle sizes was investigated under the condition of certain superficial gas velocity at 1073 K. It is found that according to different influences of particle size on the sticking, iron ore fines can be divided into three particle size ranges: small particle size at which sticking occurs in the neutral atmosphere under 1073 K, medium particle size at which defluidization happens when iron ore fines are reduced to low metallization ratio on the fluidized bed, and large particle size at which sticking does not appear on the fluidized bed, even to the end of reduction. The influence mechanism of particle size was analyzed in this paper. Moreover, under the normal fluidization condition, the swelling degree of the fixed bed after defluidization decreases with increasing particle size. © All right reserved.


Shao J.,University of Science and Technology Beijing | Shao J.,Tangshan Iron and Steel Co. | Guo Z.,University of Science and Technology Beijing | Tang H.,University of Science and Technology Beijing
Steel Research International | Year: 2013

The effect of coating MgO with different methods on sticking behavior during the reduction of iron ore fines was investigated, at 1073 K with 70%CO-30%H2 gas mixture in a visualization fluidized bed. It was found that coating MgO on particle surface could extend fluidization time from 12 min to more than 80 min, and improve the degree of metallization from 22% to more than 80%. The expansion level of bed after defluidization could also be obviously decreased. To achieve a similar effect, the initial coating content with solution method was less than that with powder method. The reason was that coating MgO could effectively insulate the contact of metallic iron on particle, which provided the reaction time for carbon deposition and the production of Fe3C with low stickiness. Therefore, the decrease of metallic iron on particle surface led to the decrease of particle stickiness at high temperature. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Yang W.,University of Science and Technology Beijing | Cao J.,University of Science and Technology Beijing | Wang X.-H.,University of Science and Technology Beijing | Xu Z.-R.,Tangshan Iron and Steel Co Ltd. | Yang J.,Tangshan Iron and Steel Co Ltd.
Journal of Iron and Steel Research International | Year: 2011

The behavior of non-metallic inclusions in LCAK (low carbon aluminum killed) steel produced by BOF (basic oxygen furnace)-LF (ladle furnace) refining-FTSC (flexible thin slab continuous caster) production route was investigated. The results showed that, LF refining for LCAK steel could decrease the ω T[o] significantly, and the inclusions were modified by Ca treatment, which prevented nozzle clogging efficiently. However, owing to the unstable casting condition in the earlier stage of casting, a severe reoxidation occurred, accompanied with mold slag entrapment. The transformation of non-metallic inclusions during the steelmaking process was Al 2O 3 → MgO-Al 2O 3 type inclusion→MgO-Al 2O 3-CaO type inclusion with a CaS ring, and the mechanism of the transformation was proposed and discussed via thermodynamic and kinetic analysis. Besides, to avoid CaS precipitation, the product of ω 2[Al] × ω[s] in steel should be less than 2.0 × 10 -10 at 1873 K, which remands higher desulfurization ratio during LF refining. © 2011 Central Iron and Steel Research Institute.


Li J.-G.,Hebei Polytechnic University | Zeng Y.-N.,Hebei Polytechnic University | Wang J.-Q.,Hebei Polytechnic University | Han Z.-J.,Tangshan Iron and Steel Co Ltd.
Journal of Iron and Steel Research International | Year: 2011

Based on the operating conditions of oxygen lance utilized for a 50 t converter in Tangsteel, gas jet flow fields of three types of oxygen lances were simulated by FLUENT software. The influence of lance configuration and lance level on penetrating area was studied through cold model experiment. The results showed that the gas flow velocities of four-hole, variable angle four-hole and five-hole oxygen lances declined rapidly with an increase in gas jet length within 1 m, 1 m and 0.8 m, respectively. Besides, the multi gas streams sprayed from these three lances should be syncretized at 1.6 m, 1.7 m and 1.4 m, respectively. At the highest lance level, the effective penetrating area of these three lances could be 0.255 m2, 0.385 m2 and 0.0907 m2, respectively. It was suggested that the effective penetrating area of variable angle four-hole oxygen lance was the biggest, while that of five-hole oxygen lance was the least. The validity of numerical simulation results was proved through cold model experiment. The lance level was suggested to be controlled in the range of 1 - 1.6 m, 1 - 1.7 m and 0.8 - 1.4 m for the four-hole, variable angle four-hole and five-hole oxygen lances, respectively. © 2011 Central Iron and Steel Research Institute.


Yang J.-C.,Inner Mongolia University of Science and Technology | Yang C.-Q.,Inner Mongolia University of Science and Technology | Jia L.-T.,Tangshan Iron and Steel Co
Chinese Rare Earths | Year: 2014

The effect of rare earth element Ce on impact toughness of IF steel at room temperature was studied by metal-lographic microscope, SEM and energy spectroscopy. The results show that the inclusion morphology is changed and the impact toughness of the steel is improved greatly with the addition of Ce. The impact energy increases with increase of additive amount of Ce, and the optimal impact toughness of investigated steel is obtained when content of Ce is 0.024%.


Gao L.,Beijing University of Technology | Zai F.,Beijing University of Technology | Su S.,Beijing University of Technology | Wang H.,Beijing University of Chemical Technology | And 2 more authors.
Sensors | Year: 2011

Most present studies on the acoustic emission signals of rotating machinery are experiment-oriented, while few of them involve on-spot applications. In this study, a method of redundant second generation wavelet transform based on the principle of interpolated subdivision was developed. With this method, subdivision was not needed during the decomposition. The lengths of approximation signals and detail signals were the same as those of original ones, so the data volume was twice that of original signals; besides, the data redundancy characteristic also guaranteed the excellent analysis effect of the method. The analysis of the acoustic emission data from the faults of on-spot low-speed heavy-duty gears validated the redundant second generation wavelet transform in the processing and denoising of acoustic emission signals. Furthermore, the analysis illustrated that the acoustic emission testing could be used in the fault diagnosis of on-spot low-speed heavy-duty gears and could be a significant supplement to vibration testing diagnosis. ©2011 by the authors.

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