基于铸机扇形段的连铸板坯热装预处理工艺设备开发

连铸板坯的热装热送作为钢-轧界面重要技术，在绿色减碳、提高成材率和缩短生产周期方面起关键作用。微合金钢连铸板坯热装温度及比例持续提高的限制性环节是钢板表面的红送裂纹缺陷，针对此问题首钢自主设计开发了基于铸机扇形段的板坯热装预处理的工艺、设备及控制系统整套技术，实现了高温铸坯表面组织细化及强韧化，消除了高温热装轧材表面的“红送裂纹”缺陷问题，解决了快冷条件下高温铸坯弯曲变形、冷却均匀性等难题，最大限度保留了高温铸坯内部温度，提高整体热装温度。相比同类技术具有更好的经济性及可复制性。

Development of equipment and technology for hot charging pretreatment basing on casting segment of slab

As an important technology of steel rolling interface, hot charging and hot delivery of continuous casting slab plays a key role in green carbon reduction, improving yield and shortening production cycle. The limiting link for the continuous improvement of the hot charging temperature and proportion of microalloyed steel continuous casting slab is the hot charging crack defect on the surface of the steel plate. In view of this problem, Shougang independently designed and developed a complete set of technology, equipment and control system for the hot charging pretreatment of slab based on the caster sector, which realized the refinement and toughening of the surface structure of high-temperature slab, and eliminated the “red feeding crack” defect on the surface of high-temperature hot charging rolled products. The problems such as bending deformation and cooling uniformity of high-temperature slab under rapid cooling conditions are solved, the internal temperature of high-temperature slab is retained to the maximum, and the overall hot charging temperature is increased. Compared with similar technologies, it has better economy and replicability.