2004年, 第11卷, 第2期　刊出日期：2004-03-25

  

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  New Type Regulating Valve Applied in Cooling System of Blast Furnace

  HE Sheng-ping, ZOU De-yu, XU Gang, LU De-chang

  钢铁研究学报（英文版）. 2004, 11(2): 1-3.

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  A new type regulating valve with the cooling mode of constant temperature difference water supply, temperature difference self-operated regulating valve, was introduced into blast furnace cooling system to overcome shortcomings of the cooling mode of constant flow rate water supply. The results show that the temperature difference between inlet and outlet water of cooling wall can be decreased greatly and steadily, and the water supply for blast furnace cooling can be reduced considerably.
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  Corrosion of Refractory Alumina-Graphite and Alumina-Graphite-Zirconia in Slag Containing Titania

  XU Yuan, LIU Qing-cai, BAI Chen-guang, CHEN Deng-fu, Joseph W Newkirk

  钢铁研究学报（英文版）. 2004, 11(2): 4-8.

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  The corrosion of refractory alumina-graphite and alumina-graphite-zirconia in the slag containing titania was studied by immersion tests (quasi-static and dynamic tests). Combining direct observation with microscopic investigations, a mechanism for corrosion was proposed based on the oxidation of graphite and the dissolution of refractory components. During the corrosion process, there are some special phenomena and laws that can be explained by the relation between the corrosion rate and the TiO₂ mass percent, the rotational refractory velocity and the morphology of the deteriorated layer.
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  Wettability of Molten Steel/Na₂O-Li₂O-SiO₂-B₂O₃ Slag System

  XIAO Feng, FANG Liang

  钢铁研究学报（英文版）. 2004, 11(2): 9-13.

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  The wettability of the molten steel/Na₂O-Li₂O-SiO₂-B₂O₃ slag system was studied by a sessile drop method. It was found that the variation of the interfacial tension with the temperature in the molten steel/slag system is pretty little in the temperature range of 1803—1873K. The interfacial tension remarkably decreases with increasing the oxygen content and/or sulfur content in molten steel. The contact angle for the molten steel/slag system is 153°-173°.
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  Vacuum Treatment for Simultaneous Desulphurization and Dephosphorization of Hot Metal and Molten Steel

  WANG Hai-chuan, WANG Shi-jun, ZHOU Yun, WU Bao-guo, DONG Yuan-chi

  钢铁研究学报（英文版）. 2004, 11(2): 14-17.

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  The vacuum treatment for simultaneous desulphurization and dephosphorization of hot metal and molten steel with pre-melted CaO-based slag was carried out. For pre-treatment of hot metal, both desulphurization and dephosphorization are improved with the increase of CaO in slag, but deteriorated with the increase of CaF₂ in slag. The average desulphurization and dephosphorization rate is 68. 83% and 78. 46%, respectively. For molten steel, the substitution of BaO for CaO in slag has minor effect on simultaneous desulphurization and dephosphorization. The desulphurization and dephosphorization rate is higher than 90% and 50 % respectively with the lowest final sulfur and phosphorus mass percent being 0. 0012% and 0. 010%, respectively. The overall effect of simultaneous desulphurization and dephosphorization of molten steel is better than that of hot metal.
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  Stream Surface Strip Element Method and Simulation of Three-Dimensional Deformation of Continuous Hot Rolled Strip

  LIU Hong-min, WANG Ying-rui

  钢铁研究学报（英文版）. 2004, 11(2): 18-24.

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  A new method, the stream surface strip element method, for simulating the three-dimensional deformation of plate and strip rolling process was proposed. The rolling deformation zone was divided into a number of stream surface (curved surface) strip elements along metal flow traces, and the stream surface strip elements were mapped into the corresponding plane strip elements for analysis and computation. The longitudinal distributions of the lateral dis-placement and the altitudinal displacement of metal were respectively constructed to be a quartic curve and a quadratic curve, of which the lateral distributions were expressed as the third-power spline function, and the altitudinal distributions were fitted in the quadratic curve. From the flow theory of plastic mechanics, the mathematical models of the three-dimensional deformations and stresses of the deformation zone were constructed. Compared with the streamline strip element method proposed by the first author of this paper, the stream surface strip element method takes into account the uneven distributions of stresses and deformations along altitudinal direction, and realizes the precise three-dimensional analysis and computation. The simulation example of continuous hot rolled strip indicates that the method and the model accord with facts and provide a new reliable engineering-computation method for the three-dimensional mechanics simulation of plate and strip rolling process.
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  Influence of Roll Elastic Deformation on Gaugemeter Equation for Plate Rolling

  HU Xian-lei, WANG Jun, WANG Zhao-dong, LIU Xiang-hua, WANG Guo-dong

  钢铁研究学报（英文版）. 2004, 11(2): 25-29.

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  The error of gaugemeter equation decreases the gap setting precision. The precision of gaugemeter equation is strongly influenced by plate width, work roll radius, backup roll radius, work roll crown, backup roll crown and rolling force. And these influences are hard to measure. All these factors are converted to roll deflection deformation and roll flattening de-formation for calculation. In order to calculate the deformation, the theory of influence function method was adopted. By using simulation program, the influence of these factors on deformation was obtained. Then a simple model can be built. With this model, it is convenient to analyze the influence of different factors on gaugemeter equation.
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  Simulation of Rolling Billet in Oval Pass by Explicit Dynamics Elastic-Plastic FEM

  LI Jian-chao, CUI Jian-zhong, MA Yong-lin, WANG Bao-feng

  钢铁研究学报（英文版）. 2004, 11(2): 30-33.

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  A study on prediction of deformation behavior (rolling force, equilibrium strain, spread) during rolling was accomplished with FE code ANSYS/LS-DYNA. The laboratory experiments were conducted on a two-high mill with roll diameter of 170 mm to approve the results of simulation by explicit dynamics FEM. It was found that there is a good agreement between calculated and experimental data, which means that the shape rolling could be analyzed by means of explicit dynamics FEM.
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  Speed Control and Coiling Temperature Control of Strip

  CAI Xiao-hui, ZHANG Dian-hua, WANG Guo-dong, LIU Xiang-hua, FAN Lei

  钢铁研究学报（英文版）. 2004, 11(2): 34-37.

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  Considering the strip speed during controlled laminar cooling on Baosteel 1580 hot strip mill in China, the influence of strip speed fluctuation on coiling temperature control for the tail and“neck”of the strip was analyzed. The optimization strategies were put forward and proved effective in operation.
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  Influence of Material Flow in Steel Manufacturing Process on Atmosphere Environmental Load

  DU Tao, CAI Jiu-ju, LU Zhong-wu, QI Yuan-hong, ZHANG Chun-xia

  钢铁研究学报（英文版）. 2004, 11(2): 38-41.

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  The standard material flow diagram in steel manufacturing process was proposed to analyze the influences of various material flows on environmental load of 1t of final product. Two influence factors and reducing measures of environmental load were pointed out. The environmental load was appraised for a typical technological process in a Chinese steel plant.
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  Simulation of Dynamic Recrystallization Using Cellular Automaton Method

  XIAO Hong, XIE Hong-biao, YAN Yan-hong, Jun YANAGIMOTO

  钢铁研究学报（英文版）. 2004, 11(2): 42-45.

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  A new modeling approach that couples fundamental metallurgical principles of dynamical recrystallization with the cellular automaton method was developed to simulate the microstructural evolution linking with the plastic flow behavior during thermomechanical processing. The driving force for the nucleation and growth of dynamically recrystallized grain is the volume free energy due to the stored dislocation density of a deformation matrix. The growth terminates the impingement. The model is capable of simulating kinetics, microstructure and texture evolution during recrystallization. The predictions of microstructural evolution agree with the experimental results.
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  In-Situ Austenite Steel Matrix Composite Reinforced by Granular γ+ (Fe, Mn)₃C Eutectic

  LIANG Gao-fei, XU Zhen-ming, JIANG Qi-chuan, LI Jian-guo

  钢铁研究学报（英文版）. 2004, 11(2): 46-51.

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  A new in-situ austenite matrix composite reinforced by granular γ+ (Fe, Mn)₃C bi-nary eutectics (abbreviated to in-situ AMGE) was prepared in as-cast state, in which the modifier, yttrium-based heavy rare earth alloy, was used to influence carbon segregation, manganese segregation and phase formation. The eutectics are formed in the molten pools among austenite dendrites at the later stage of non-equilibrium solidification because the modifier enhances carbon segregation and manganese segregation greatly. Pin-on-disc dry wear tests show that the wear resistance of in-situ AMGE is 1—3 times higher than that of austenite medium manganese steel under low and medium loads, and the loads under which serious wear of in-situ AMGE occurs are much higher than that of austenite medium manganese steel.
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  Investigation on Mechanical Property of Seamless Pipe

  ZHAO Li-ming, YANG Xiao-yong, LIU Ye

  钢铁研究学报（英文版）. 2004, 11(2): 52-54.

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  The mechanical properties of the steel pipe rolled with continuously casting round billet after determining the chemical composition in steel were studied. The results show that the total reduction ratio should be higher than 5.2 when the line pipes of grade B, grade 20 ad other general seamless pipe were rolled with continuously casting round billet. And the total re-duction ratio should be higher than 10.2 and the grain size should be controlled more than grade 7 for casing of oil countryside tubular goods (OCTG).
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  Giant Magnetoimpedance Effect in Fe₈₉Zr_7-xHf_xB₄ Ribbon

  YU Xiao-jun, HU Ji-fan, QIN Hong-wei

  钢铁研究学报（英文版）. 2004, 11(2): 55-58.

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  The giant magnetoimpedance (GMI) effect in Fe₈₉Zr_7-xHf_xB₄ (x=0. 5 or 1. 0) ribbon annealed at different temperatures was investigated. The results show that some addition of hafnium to Fe-Zr-B raises the GMI effect. There is an optimum annealing temperature about 570℃ for obtaining large GMI behavior in Fe₈₉Zr_7-xHf_xB₄ (x=0.5 or 1.0) nanocrystalline ribbons. At 900 kHz, the magnetoimpedance for Fe₈₉Zr₆Hf₁B₄ nanocrystalline ribbon mono-tonically changes with applied DC field, and reaches —33.4% at 7162 A/m. Meanwhile, the results show that the transverse anisotropy field of Fe₈₉Zr₆Hf₁B₄ ribbons decreases with in-creasing annealing temperature from 520℃ to 620℃.
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  Material Determination of Vehicle Part Using Strain Analysis Method

  LI Lirjun, ZHU Hong-chuan, SHEN Cheng-wu

  钢铁研究学报（英文版）. 2004, 11(2): 59-62.

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  The experiment regarding material determination of a vehicle part was conducted. The experiment on stamping production of a part using the steels A, B and C was made. The strain data on the deformed parts were measured. The forming limit diagrams for the steels were examined and evaluated. The results show that three steels are unsuitable for this stamping part. The desired material properties with an optimal strain hardening exponent value were determined using experimental and analytical methods. The steel D was chosen as a desired material. The results show that the steel D is appropriate for mass production. In addition, the feasibility of the application of thinner material to this part was studied. The validity of the material selection was verified theoretically and experimentally.