| Title |
Influence of Withdrawal Cycle and Casting Speed on the Surface Quality of Horizontally Continuous Cast SCM 440 Billets |
| Authors |
이병화(B. H. Lee); 유병돈(B. D. You); 김목순(M. S. Kim); 정일권(I. K. Jung); 윤황로(H. R. Yoon) |
| Keywords |
Horizontal continuous casting; Billet; Withdrawal cycle; Casting speed; Surface quality; Transverse crack; Corner crack |
| Abstract |
Trial tests were made to examine the effects of casting pattern on the surface quality of SCM 440 billets in horizontal continuous casting. The withdrawal cycle and the casting speed were varied 40~80 cycle/min and 0.7~1.0 m/min respectively. The main results obtained could be summarized as follows: When the withdrawal cycle is low, the withdrawal mark is irregular and the surface of billet is rough due to the formation of the lapped skin. The increase of withdrawal cycle results in the uniform withdrawal mark and the fine surface of cast products. The very low or the very high withdrawal cycle is essential for the prevention of transverse cracks on surface and corner cracks of the billet. For the case of the withdrawal cycle of 50 cycle/min, the effects of casting speed on the formation of transverse cracks and on the surface roughness could not be justified accurately due to the formation of lapped skin. The casting speed does not affect, however, the formation of the corner crack. |