1984年3月下旬上海冶金工业局对上海耐火材料厂和上海钢铁研究所协作研制的三层式滑动水口进行了技术鉴定。三层式滑动水口,在工业发达国家已研制成功并在中间包上得到应用,我国还是空白。由于现用滑动水口的下水口在开启和关闭过程中是移动的,因此,在连注中间包、小铸件钢包及真空浇注和保护浇注等诸方面的应用受到了限制。为防止二次氧化,提高精炼效果,实现VOD炉外精炼后保护浇注。 In late March 1984, Shanghai Metallurgical Industry Bureau conducted technical appraisal on the three-layer sliding gate developed by Shanghai Refractories Factory and Shanghai Iron and Steel Research Institute. Three-tier sliding gate, developed in industrialized countries have been developed and applied in the tundish, our country is still blank. As the outlet of the existing sliding nozzle is moved during the opening and closing process, the application of the tundish, the small casting ladle, the vacuum pouring and the protective pouring are limited. In order to prevent the secondary oxidation, improve the refining effect, to achieve VOD furnace casting protection after refining.