The ladle self-opening is a key step that affects the smooth running of continuous casting. Meantime

it is an important factor that affects the cleanliness of molten steel. If the ladle can not be opened by itself

it will have to use oxygen lance for introducing liquid flowing to destroy the sintered layer

but this will lead to a large amount of oxygenation of steel and seriously damage the cleanliness of the molten steel. In order to improve the cleanliness of molten steel by increasing ladle self-opening rate

the influences of filler sand types

particle sizes

water content

additives

adding methods

shape characteristics of nozzle base brick and the reaction between filler sand and molten steel on the self-opening rate of ladle are summarized

among them

the filler sand with particle size is 0. 5 ~ 1.4 mm contained appropriate amount of coarse rounded particles

filler graphite content 2% 〜4% and water content less than 0. 15% has a higher opening rate.