In this study, the inner quality of a 400-mm-thick continuous casting slab was improved by heavy mechanical reduction. Heat transfer computation was performed to clarify the formation mechanism of the uneven solidification of the slab. It was found that the W-shaped solidification frontier in the slab width direction was closely related to unreasonable cooling. By optimizing the cooling, more synchronous solidification of the slab was realized. The original double-crater liquid core of the slab in the casting direction was prohibited, and the W-shaped solidification frontier along the slab width direction was modified into a flat “tongue.” The uniform solid fractions in the width direction favored the conduction of heavy reduction. It was found that the 20-mm reduction near the solidification end of the slab was efficiently permeated from the slab surface into the slab center, which greatly helped to “heal” the central porosities in the slab.

在这项研究中，400 毫米厚的连铸板坯的内部质量通过重机械压下得到改善。进行传热计算以阐明板坯不均匀凝固的形成机制。研究发现，板坯宽度方向的W形凝固边界与冷却不合理密切相关。通过优化冷却，实现了板坯更同步的凝固。禁止原有铸坯连铸方向双坑液芯，将沿板坯宽度方向的W形凝固前沿修改为扁平“舌”。宽度方向上均匀的固体分数有利于重还原的传导。