Imported flow sand as a fair furnace steel with the indispensable refractory data, not with molten steel and alloy composition of chemical reaction, good dispersion activity. The following basic requirements shall be met when used for ladle inflow:

1. The inlet flow sand is in the shape of low temperature for a long time at the ladle nozzle, which requires high refractoriness of the sintering layer;

2. Indirect contact with molten steel after filling the nozzle, the initial sintering temperature should not be too high;

3. In the process of use, accept large hydrostatic pressure of molten steel. In order to avoid tension material, it is required to have very good mobility and the friction between particles is as small as possible; When the inflow sand is used for ladle inflow, the above requirements must be met to prevent the molten steel from being blocked and poured, which will affect the quality of molten steel, and further affect the health and safety of operators and equipment, and add the pouring cost.

Inlet flow sand has good dispersion activity, high refractoriness, no sintering, no blockage, is a fair furnace steel with the indispensable refractory data. In the process of work, the inflow of sand flow through the following mechanism to import the flow. The flow sand is used as the filling data of the nozzle at the bottom of the ladle, and the second function is to guide the molten steel to open itself.

The mechanism of action is as follows: under the hot action of molten steel, a thin sintered layer breaks out on the upper surface of the ladle nozzle, forming a "shell". Once the slide plate is opened, the vast majority of unsintered sand bodies in the nozzle fall down. At the same time, the "shell" is broken by the static pressure of molten steel, and the molten steel automatically flows out. The imported flow sand can meet the molten steel surface under the high level and long time smelting shape, without chemical reaction with molten steel and alloy composition, and can meet the requirements of steelmaking process. It is an ideal refractory material for fair furnace steelmaking.