ABSTRACT

The solidification structure of a thin slab during the continuous casting process at high casting speed was simulated based on the cellular automaton-finite element (CAFE) model. The simulations were consistent with the solidification structures of actual steel samples, and the influence of the continuous casting process parameters and alloy elements were further studied in detail. The optimum process parameters obtained are as follows: the casting speed at 5.2–5.4 m min⁻¹, the superheat at 20–25 °C, and the specific water flow at 1.62–1.64 L kg⁻¹. Meanwhile, the Si content in the thin slab was appropriately increased to refine the grains and improve the production efficiency. This study provides important theoretical data for practical thin slab production, improvement of the continuous casting efficiency, thereby reducing accidents.

摘要

基于元胞自动机-有限元(CAFE)模型对高速连铸过程中薄板坯的凝固组织进行了模拟。模拟与实际钢样的凝固组织一致，并进一步详细研究了连铸工艺参数和合金元素的影响。得到的最佳工艺参数为：拉速5.2~5.4 m min ⁻¹，过热度20~25 °C，比水流量1.62~1.64 L kg ⁻¹. 同时，适当提高薄板坯中Si含量，细化晶粒，提高生产效率。该研究为实际生产薄板坯、提高连铸效率、减少事故发生提供了重要的理论数据。