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Summary

TUNDISOL (REACTOL, AFAX TD) is an active tundish cover, which is used on the surface of the steel in the tundish during casting for the purpose of thermal insulation, chemical insulation and inclusion removal.

Description

TUNDISOL is a powder product supplied in paper sacks. It is continually added to surface of the steel in the tundish during casting. It consists of a mixture of basic active components, which have a melting point below that of molten steel, and is designed to absorb inclusions and prevent reoxidation of the steel.

Application

After teeming starts and the tundish metal level is stabilised, TUNDISOL is applied on top of the tundish metal surface. As casting proceeds further additions of TUNDISOL are made from time to time to replenish the cover flux. Where a tundish lid is used, the TUNDISOL bag can be added through the openings provided.

For best results it is recommended that a TUNDISOL active tundish cover is used in conjunction with RADEX tundish insulating powder, to ensure optimum performance of both inclusion capture and minimum temperature loss.

A range of recipes is available to suit all steel grades.

Function

An exposed metal surface leads to reoxidation and heat losses. Moreover, refractory and other non-metallic inclusions which float to the surface of the tundish during casting can get mixed back in with the metal and carried down into the mould, where they become trapped and form defects in the final cast product. When applied to the surface of the liquid steel in the tundish, TUNDISOL immediately forms a liquid slag at the steel/slag interface, thus preventing reoxidation and heat loss of the steel. By virtue of its chemical nature the slag has a high solubility for alumina which, along with other non- metallic inclusions which float to the surface of the tundish, is absorbed without substantially altering its own melting behavior and fluidity.

Benefits

	Non-metallic inclusions, which float to the surface of the tundish metal, are absorbed.
	Surface reoxidation is reduced by the formation of a layer of liquid slag on top of the steel surface.
	Heat loss is reduced by the formation of a uniform slag cover on top of the tundish metal surface