薄板坯连铸结晶器铜板热/力行为

基于国内某钢厂CSP漏斗结晶器铜板结构,建立了考虑铜板水槽冷却水流动的薄板坯结晶器铜板三维热/力耦合计算模型,研究分析了典型连铸工艺下结晶器铜板水槽内冷却水的传热特点和铜板温度场与热应力场分布规律,并探讨了冷却水流速及铜板厚度对铜板热/力行为的影响。结果表明,铜板宽面热面与窄面热面最高温度均位于弯月面下约15 mm处,分别达436.5、379.2 ℃。宽面和窄面铜板的最大热应力均位于弯月面下方约25 mm处,分别达876.7、867.8 MPa。宽面铜板的热应力总体比窄面高且分布更为不均匀,螺栓处热面的热应力整体低于其两侧水槽处热面的热应力。增加冷却水流速、减小铜板厚度可减小铜板热面温度与热应力。将螺栓处冷却水缝延长到距结晶器下口30 mm处,可显著改善宽面铜板中下部横向温度分布的均匀性,使其热面横向最大温差减少约19.6 ℃。

Thermo-mechanical behavior of thin slab continuous casting mold copper plate

Based on the copper plate structure of CSP funnel mold for a domestic steel plant, a three-dimensional thermo-mechanical model coupling with the flow and heat transfer of cooling water was developed. The heat transfer characteristics of cooling water, temperature distributions and thermal stresses field of mold copper plates under typical continuous casting conditions were also studied, as well as the effect of cooling water velocity and copper plate thickness on thermal-mechanical behavior of copper plate. The results showed that, the mold temperatures reached their maximum at 15 mm below the meniscus for wide face and narrow face, their maximum temperatures were 436.5 and 379.2 ℃, respectively. The maximum thermal stresses of wide face and narrow face were located at 25 mm below the meniscus, they were 876.7 and 867.8 MPa, respectively. The thermal stress of wide face was generally higher than that of narrow face and the distribution of former was more uneven. The thermal stress of hot face beneath the bolt holes was lower than those beneath the sinks on both wide and narrow faces. Increasing the cooling water velocity and reducing the thickness of copper plate could reduce the temperature and thermal stress of hot faces for copper plates. Extending the cooling water slot at the bolt to 30 mm from outlet of mold could significantly improve the uniformity of lateral temperature distribution in the middle and lower parts of wide face copper plate, and reduce the maximum lateral temperature difference of hot face by about 19.6 ℃.