Development of theory and practice of steel continuous casting, requires the deep study of processes what is going on the contact surface between supporting rolls and continuous casting strand in the area of aftercooling. In the process of continuous teem casting usualy there is a thin layer of ferrous oxide. The properties this layer in a great deal determine friction and heat exchange on the contact, and, consequently, distribution of moving and deformation of ferrous oxide. Under some conditions durability of ferrous oxide exceeds the durability of hard crust of the casted metal, that results in pressing of ferrous oxide to the body of strand and deformation of its surface.

Rolls of a continuous casting machine work in the conditions of the cyclic temperature heating dye to contact heat teansfer and radiation from the surface of strand. In the process of deformation of ferrous oxide in the area of aftercooling there is its partial sticking on the surface of supporting roll, that it is necessary to examine as a result of change of heat transfer and thermal effect. The layer of ferrous oxide on the contact surface substantially influences on the thermal mode of operations of roll, creating additional thermal resistance between a roll and strand. In addition, the cyclic heating of supporting rolls results in their enhanceable wear destruction.

Thus, a ferrous oxide is formed in different temperature conditions, is differed by a macrostructure and is the mixture of oxides and particles of slag, which appears layer-by-layer on the surface and under some conditions winded on a roll.

Change of calculation balance of the heat given by the strand to the barrel of roll and taken from him by water, conditioned by the insufficient second expense of cooler and decline of coefficient of heat emission because of appearance of layer of ferrous oxide on the surface of internal cavity of roll.

The control cooling water of flow rate, executed by the set meter, showed on the horizontal part of a continuous casting machine cooling of one roll on the average is expended 20 – 24 l/mins of water. At such expense water fills only lower part of internal cavity of barrel of roll.(picture).

With the purpose of increase of heat emission surface of roll it was decided to change the conditions of heat remove by water due to the turn on a 180⁰ tank of swivel. In this case from getting up of the downlow union coupling water fully fills the cavity of barrel of roll, as a result part of heat removing surface a minimum is multiplied in two times. How rotined the supervisions and results of measurings of temperature of surface of rollers by a pyrometer, the indicated decision did not allow to remove the effect of «winding» of ferrous oxide by a roll. On the basis of obtained information a conclusion was done about expedience of application of the additional cooling of outward surface of barrel of roll.