| 摘要 |
The invention relates to a continuous steel casting installation for billet and bloom formats that have a substantially rectangular cross-section. The aim of the invention is to improve the strand structure in the corner areas, to avoid rhomboidity, cracks and dimensional imperfections of the strand cross-section and to achieve a high throughput capacity per strand while reducing investment and running costs. For this purpose, the fillets of the groove curvatures (12, 12', 13, 13') in the die cavity amount to at least 10 %, preferably 15 % or more of the length of the side (16) of the strand cross-section. The degree of curvature 1/R of the groove curvatures (12, 12', 13, 13') decreases in the direction of the strand at least along a partial length of the entire casting die, thereby allowing to control a targeted gap elimination between the casting shell and the casting die wall or a targeted casting shell shaping in the area of the groove curvature. The continuous casting installation, directly downstream of the casting die, is provided with a strand support-free secondary cooling zone or a supporting guide in the secondary cooling zone that is reduced in its supporting width and/or supporting length. |
