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Application of Hot Strength and Ductility Test to Optimization of Secondary Cooling System in billet continuous casting Process

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Journal of Iron and Steel Research International 2008年第4期15卷 16-20页

作者： WANG Biao JI Zhen-ping LIU Wen-hong MA Jiao-cheng XIE Zhi Department of Materials Science and Engineering Northeastern University Qinhuangdao 066004 Hebei China School of Information Science and Engineering Northeastern University Shenyang 110004 Liaoning China

By means of Gleeble-1500 dynamic thermomechanical simulator, the continuous casting process for HRB335C steel was simulated using solidifying method and hot ductility and strength of the steel were determined. The test results indicate that there are three temperature regions of brittleness for HRB335C billet in the temperature range from 700 ℃ to solidification point; the first temperature region of brittleness is 1 300 ℃ to solidification point of the billet, the second temperature region of brittleness is 1 200-- 1 000 ℃, and the third temperature region of brittleness is 700-850 ℃ ; the steel is plastic at 850--1 000 ℃. The cracking sensitivity was studied in the different temperature zones of the brittleness for steel HRB335C and the target surface temperature curve for the secondary cooling is determined. With optimized process, the mathematical model of the steady temperature field with two-dimensional heat transfer for 150 mm×150 mm HRB335C steel billet was established to optimize the secondary cooling process. The conic relation of water distribution between secondary cooling water flux and casting speed is regressed. Keeping the surface temperature of billet before the straightening point above 1 000 ℃, the results of billet test indicate that there is free central shrinkage cavity. The billet defect is decreased greatly, and the quality of billet is obviously improved.

关键词： continuous casting billet brittle temperature zone tensile strength secondary cooling simulation

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Influence of mechanical reduction amount on internal quality of continuous casting billets by thermal and numerical simulation

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Journal of Iron and Steel Research International 2023年第6期30卷 1234-1243页

作者： Dan-qing Jiang Shu-jian Sun Han Wu Yang-jian Xu Fu-hai Zhu Zhen-qiang Zhang Jiang Wang Zhong-ming Ren School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

With establishment of thermal and numerical simulation models,the influence of reduction amount on solidification structure,segregation and shrinkage porosity of continuous casting(CC)billets was *** thermal–mechanical coupled simulation results indicated that with an increase in reduction amount,the temperature in the central area decreases,and the reduction efficiency firstly increases and then decreases,reaching the maximum value at reduction amount of 6 *** analysis showed that increasing the reduction amount is beneficial for the refinement of central solidification ***,the internal cracks are more likely to appear at higher reduction *** X-ray computerized tomography results revealed that a higher reduction amount can significantly reduce the volume fraction and equivalent diameter of the central shrinkage porosities of CC billets and increase the sphericity of ***,the macrosegregation of carbon along the central line is improved as the reduction amount increases;while the reduction amount exceeds 8 mm,the segregation degree will not change any more.

关键词： Mechanical reduction Solidification structure Porosity Thermal simulation continuous casting billet

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Void Closure Behavior in Large Diameter Steel Rod during H-V Rolling Process

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Journal of Iron and Steel Research International 2014年第3期21卷 287-294页

作者： Hua-gui HUANG Yong LIU Feng-shan DU Lei CHEN National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan University

In order to reveal the mechanism and condition of void closure in large diameter steel rod during horizontal- vertical （H-V） groove rolling process, a three-dimensional thermomechanicaily coupled finite element model was es- tablished for 9-stand H-V groove rolling process aiming at a 4150 mm steel rod production line. A spherical hole with diameter from 2 to 10 mm was preset into the center of continuous casting billet with a rectangle cross section of 300 mmX 360 mm in this model to simulate the void defect, and then finite element analyses were carried out to observe and quantify the void shape evolution in each pass on the three orthogonal coordinate plane sections. The re- suits showed that the void was formed roughly in the reduction and extension directions, and crushed gradually from spherical shape to an approximate ellipsoid, micro-crack and finally to be closed. A quantitative analysis was carried out by using elliptic radii and closure ratio to describe this evolution process; it indicated that the longest axis of the ellipsoid coincided with the rolling line, and the second and third axes were alternatively ihorizontal and vertical on the exit cross section according to change of the reduction direction in H-V groove. The void closure behavior during H- V rolling was more complicated than that of common horizontal rolling, and the influence of groove type and the ex- tension coefficient on the void closure ratio was presented. Finally, a pilot rolling experiment was performed on a 5- stand H-V experimental mill to verify the numerical simulation results, and the experimental results are in good agree- ment with the numerical simulation results.

关键词： large diameter steel rod continuous casting billet H-V groove rolling~ void closure FEM

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