Analysis of Beam Blank Defects and Optimum Control for High Efficient Continuous Casting

摘要

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 studied. From the forming mechanism of the two defects, many factors concerned are analyzed. It 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 blank. So the mold powder with low heat transfer velocity and the appropriate cooling technology are adopted. On 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 technology. After 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%.