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近年来,对钢板的内部质量要求越来越高,为此,美国lukens钢公司成立了一个小组专门研究改善钢的清洁度。他们采取了以下措施:a.采用普通取样器在中间包取样,用测得试样的总氧含量来测定钢的内部清洁度;b.改进操作工艺:(a)开浇:使用逐步提高铸速的自动开浇技术,可防止前沿浇不足的缺陷,再通过减少开浇渣的数量和调整开浇渣的成分,保证了表面质量;(b)浸入式水口的材质:铝碳质水口取代熔融石英水口,同时喷补内衬和修改中间包造渣工艺使总氧含量小于
In recent years, the internal quality of the steel sheet is getting higher and higher, therefore, the United States lukens steel company set up a group specializing in improving the cleanliness of the steel. They took the following measures: a. Sampling in a tundish using a common sampler and determining the internal cleanliness of the steel using the total oxygen content of the test specimen; b. Improving the process of operation: (a) pouring: using progressive casting Speed automatic pouring technology to prevent the shortage of front pouring defects, and then by reducing the amount of dregs open and adjust the composition of dregs opened to ensure the surface quality; (b) Immersion nozzle material: aluminum carbon nozzle instead of Fused quartz nozzle, spray lining at the same time and modify tundish slagging process to make the total oxygen content less than