板坯亚包晶钢连铸结晶器水口优化及工业试验

Optimization and Industrial Test of Continuous Casting Mold SEN for Hypo-Peritectic Steel Slab

为改善国内某厂在浇注亚包晶钢时出现的严重表面纵裂问题，对结晶器原水口出口结构进行了改进，并采用实验室1：1水模型研究了水口改进对结晶器流场的影响。结果表明，使用改进水口后，结晶器内液面波动与表面流速均有所降低。通过对该厂水口改进后结晶器内流场的现场测量，发现液面波动处于±3mm范围内的比例由80％增至90％以上，结晶器内外弧面平均热流量分别减少0．21，0．20MW／m^2，促进了结晶器的缓冷，改善了高质量亚包晶钢板坯的生产条件。

In order to improve bad surface longitudinal cracks during casting hypo-periteetic steel in a certain plant, the old mold SEN outlet structure was optimized, and advanced influence to the new mold flow fields was studied through 1：1 scale water model experiments. Results showed that both mold level fluctuation and surface velocity were reduced with the application of new SEN. From the on- site measurement data of new SEN flow fields, the proportion of mold level fluctuations within the range of ±3 mm was increased from 80% to more than 90%. Meanwhile, the average heat fluxes of inner and outer arc sides of mold were reduced 0. 21 MW/m^2 and 0. 20 MW/m^2 respectively, which enhanced mold slow cooling and made high quality hypo-peritectic slab production better.