不锈钢连铸板坯结晶器钢液喂稀土丝工艺试验研究

通过工业试验并结合数值模拟计算,研究了不锈钢连铸结晶器钢液喂稀土丝工艺的铸坯稀土收得率和稀土元素分布。结果表明,结晶器喂稀土丝其稀土收得率高达85%,但实际铸坯外层靠近凝固坯壳处稀土含量相对较高且分布不均匀(RE 0.059%～0.073%),其原因是由于结晶器钢液凝固早期稀土浓度偏高而且分布不均匀。因此,在模拟计算或实际生产中,应考虑凝固相变对稀土分布的影响,并注意稀土丝直径、喂线速度与连铸参数的匹配,避免稀土元素的偏聚。

Research on Technology of Feeding Rare-earth Wires in Liquid in Stainless Steel Slab Continue Casting Mould

The recovery rate and distribution of rare earth elements with the condition of feeding rare earth wire in liquid in stainless steel continuous casting mould are studied by industrial test and numerical simulation. The results show that feeding rare earth wire into the mould has 85% rare earth recovery rate, but the content of rare earth near the solidified shell is relatively high and the distribution of rare earth is inhomogeneous (RE 0. 059% ?0. 073% ) , which is due to the high concentration and inhomogeneous distribution of rare earth in mould liquid at early solidification period. Therefore, the influence of solidification transformation on the distribution of rare earth should be considered in the simulation or industrial production. In order to avoid the segregation of rare earth elements, the matching of rare earth wire diameter, wire feeding speed and continuous casting parameters should be paid attention to.