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NUMERICAL SIMULATION OF THE THERMO-MECHANICAL PROCESS FOR beam blank CONTINUOUS CASTING

Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 241-250页

作者： W. Chen Y.Z. Zhang C.J. Zhang L.G. Zhu B.X. Wang W.G. Lu J.H. Ma Key Laboratory of Metastable Materials Science and Technology College of Materials Science and Engineering Yanshan University Qinhuangdao 066004 China College of Metallurgy and Energy Engineering Hebei Polytechnic University Tangshan 063009 China Tangshan Heavy Plate Co. Ltd. Tangshan 063610 China Hebei Jinxi Steel Stock Co. Ltd Tangshan 064302 China College of Mechanical Engineering Yanshan University Qinhuangdao 066004 China

The aim of this study was to simulate the solidification process of beam blank continuous casting, and then find the reasons for the typical defects of the beam blank. A two-dimensional transient coupled finite element model has been developed to compute the temperature and stress profile in beam blank continuous casting. The enthalpy method was used in the heat conduction equation. The thermo-mechanical property in the mushy zone was taken into consideration in this calculation. It is shown that at the mold exit the thickness of the shell had its maximum value at the flange tip and its minimum value at the fillet. The temperature had a great fluctuation on the surface of the beam blank in the secondary cooling zone. At the unbending point, the surface temperature of the web was in the brittleness temperature range under the present condition. To ensure the quality, it is necessary to weaken the intensity of secondary cooling. At the mold exit the equivalent stress and strain have higher values at the flange tip and at the web. From the spray 1 to the unbending point, the maximum values of stress and strain gradually moved to the internal section of the flange tip and the web. However, whenever, there were bigger stress and strain values near the flange tip and the web than in the other parts, it must be very easy to generate cracks at those positions. Now, online verification of this simulation has been developed, which has proved to be very useful and efficient to instruct the practical production of beam blank continuous casting.

关键词： beam blank continuous basting thermo-mechanical process simulation

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Analysis of Thermal Behavior for beam blank Continuous Casting Mold

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Journal of Iron and Steel Research International 2010年第12期17卷 17-22页

作者： XU Hai-lun WEN Guang-hua SUN Wei WANG Kai-zhong YAN Bo College of Materials Science and Engineering Chongqing University Chongqing 400044 China Ma'anshan Iron and Steel Co Ltd Ma'anshan 243003 Anhui China College of Resources and Environmental Science Chongqing University Chongqing 400044 China

Finite element models of steady heat conduction for cross section of beam blank mold were developed by using ABAQUS software. The effect of mold grinding thickness, cooling water velocity, diameter of restrietor rods and water channel design on hot face temperature was analyzed in detail. Attention was focused on the peak temperature and temperature uniformity along hot face. The results showed that the peak temperature of existing mold, about 337.2 ℃, is located in the fillet, and two valleys of hot face temperature are found in flange corner and junction of wide face and narrow face, respectively. Decreasing mold thickness, increasing cooling water velocity and increasing diameter of restrictor rods can all reduce peak temperature and improve temperature uniformity along hot race at the expense of lower overall temperature. Redesigning the water channel can decrease peak temperature and thermal gradient of mold without lowering overall temperature of hot face. In particular, the small hole design can improve temperature uniformity across hot face and obtain the best advantage.

关键词： beam blank continuous casting mold thermal behavior temperature distribution

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Analysis of beam blank Defects and Optimum Control for High Efficient Continuous Casting

Analysis of Beam Blank Defects and Optimum Control for High ...

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The 4th International Conference on Continuous Casting of Steel in Developing Countries

作者： SHI Xiong-liang Maanshan Iron and Steel Ltd.Co., Anhui, Maanshan 243000

For the underground of high efficient beam blank CC in Ma’steel,the uppermost beam blank defects which are the longitudinal surface crack and the centerline crack are *** the forming mechanism of the two defects,many factors concerned are *** is found that the properties of mold powder,and the mold cooling technology,and the secondary cooling technology are the main factors of the longitudinal surface crack for beam *** the mold powder with low heat transfer velocity and the appropriate cooling technology are *** the other hand,the primary causes to the centerline crack for beam blank are the high sulfur content,and the bad mechanical status of mold and second cooling segment of continuous caster,and the unfitting secondary cooling *** the systematic improvement measures carried out,the beam blank quality is improved,the abandon production rate declines 50%,and the first class production rate for casting quality analyzed by macroetch testing gets to 92%,and the second class production rate gets to 98%.

关键词： beam blank high efficient CC longitudinal surface crack centerline crack

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