Abstract: A method of casting quiet steel in a mold according to which prior to the casting of casting powder with a bulk weight of from 250 to 705 gr/liter and in a quantity of from 1 to 3 kg/ton of steel is introduced into the mold at a distance of from 5 to 50 cm from the base of the mold, and in which when the liquid steel level reaches the desired height the slag layer is instantaneously and completely covered with water whereby the entire slag layer solidifies and lifts itself off the steel level so that the latter is contacted by the water.