不同宽度H^2结晶器流动、传热凝固行为对比

Comparison of Fluid Flow,Heat Transfer and Solidification Behaviors of H^2 Mold with Different Widths

薄板坯连铸工艺的H2漏斗形结晶器可以生产宽度860～1 730 mm的铸坯。对不同宽度H2结晶器内钢液流动、传热凝固行为进行研究,能加深了解H2结晶器内的冶金行为,并为H2薄板坯连铸设备制造及工艺参数优化提供指导。采用数值模拟技术研究拉速4.5 m/min时,宽度900、1 300、1 700 mm结晶器内钢液流动、传热凝固行为。结果表明:结晶器宽度增加,流场变化显著,钢液自由液面近水口处波动加剧。不同宽度下,结晶器出口处铸坯坯壳厚度及其表面温度的差别主要体现在靠近铸坯窄边处。

The H2 funnel -shaped mold for FTSC process can produce the slab with width of 860 mm ~ 1 730 mm. The study on molten steel flow, heat transfer and solidification behavior of H2 mold with dif- ferent widths ean help to make a better understanding about metallurgical behaviors in the H： mold and provide guidance for equipment manufacturing and process parameters optimization. Numerical simulation technique is employed to study the fluid flow, heat transfer and solidification behaviors in the mold with the casting speed of 4.5 m/rain and the H2 mold widths of 900 mm, 1 300 mm, and 1 700 mm. The re- suits show that with the increase in mold width, the flow field has noticeable change, and the wave fluc- tuation at the free surface near the SEN intensifies. Under the conditions of different widths of mold, the differences in surface temperature and solidified shell thickness of the slab at the exit of the mold are mainly reflected near the narrow face.