一、绪言在连铸结晶器内添加冷材的实验报告,大部分都是关于钢液温度和冷材的添加量、形状和成分对等轴晶率的变化和中心偏析的影响,而关于内部裂纹的报告很少。这次进行的是往线材和板材添加有困难的连铸方坯中投入钢粒的实验。根据其结果确认等轴晶率的增加和内部裂纹随其增加而减少的情况,报告如下: First, the introduction In the continuous casting mold to add cold test reports, most of them are on the molten steel temperature and the amount of cold material, shape and composition of the equiaxed grain rate changes and the impact of center segregation, and on the internal Cracks rarely reported. This time, the experiment of throwing steel particles into continuous casting billets with difficulty in adding wires and plates was carried out. Based on the results, it was confirmed that the increase of equiaxed grain rate and the decrease of internal cracks as it increases, are reported as follows: