为了提高连铸机的生产率 ,板坯必须在较高速度下浇铸。但日本新日铁公司的实践证实 :如果拉速较高 ,连铸结晶器内的保护渣会被卷入钢液中 ,使产品的表面产生缺陷 ,典型的如镀锡板中的白点缺陷。为此 ,该厂研究了生产镀锡板时白点缺陷的形成机理及其解决办法。主要结果可概括如 In order to increase the productivity of the continuous casting machine, the slab must be cast at a higher speed. However, the practice of Japan’s Nippon Steel Co., Ltd. confirmed that if the casting speed is high, the mold powder in the continuous casting mold will be entangled in the molten steel to cause defects on the surface of the product. Typical examples are white spot defects in tinplate . To this end, the plant has studied the formation mechanism and the solution of white point defects in the production of tinplate. The main results can be summarized as