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| Analysis of Effect Factor on Transverse Rupture for Continuous Cast Billet |
| SUI Xiaohong1,LI Ping1,XIE Guangqun1,LI Haohan2 |
| 1.Technology Center of Anshan Iron and Steel (Group) Co., Ltd., Anshan 114009, Liaoning, China; 2. Central South University, Changsha 410083, Hunan, China |
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Abstract The inspection and analysis and the process thermal simulation test have been made by using metallographic microscope and SEM on the failure of transverse rupture in the containing silicon low carbon steel billets after continuous casting. The continuous casting billet bearing internal and external forces and their dependence with crack growth have been analyzed in the whole thermal process from liquid steel solidification to rupture as heating before rolling. The result indicates that the failure is mainly owing to the higher degree of superheat of cast molten steel, the slower cooling rate of solidified structure, and thus the serious coarsening grains were got, the greatly decreased strength of columnar crystal boundary, thus internal cracks during the process of reeling and curving of billet were formed. When reheating, the thermal stress makes the internal cracks sustainedly expanded and finally rupture. Therefore the most effective way to prevent billet from transverse rupture is to adjust the casting temperature of the containing silicon low carbon steel billet to a proper degree, so as to enhance the center equiaxed grain rate in the solidified structure.
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Received: 01 January 1900
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2009, Vol. 44 
