Prosimet S.p.a.

They are composed essentially of CaO-Al2O3-SiO2 with addition of fluxing agents and carbon.

Mold fluxes have different functions:

to provide chemical protection of liquid steel from oxidation;
to provide thermal insulation preventing solidification of steel surface;
to lubricate the strand to the mould to provide uniform heat transfer between the strand and the mould wall.
In order to maintain such highly specific and critical technological properties in SINTHESIS series it’s necessary to strictly monitor raw materials, production operations and final products by means of efficient Q&C procedures.

mong Proteem product series it’s possible to select a suitable material according to operational parameters of each specific application. Generally for tundish application factors affecting product performance result to be steel grade, exposed steel surface to be covered, casting time, and sequence index.

On the other side, regarding ladle applications, critical factors are chiefly the amount and the characteristics of the refining slag.

Increasing demand of better quality steel and subsequent use of high performance basic tundish lining material boosted researching and developing of active basic tundish powders assuring high covering and insulating properties and low corrosion activity.

Moreover effective NMI absorption capability is provided by specific viscosity and surface tension of molten slag layer in direct contact with molten steel.

Plant experience in using these active basic tundish powders gave improved steel cleanness.

New product, composed by a solid-liquid dispersion of conveniently formulated continuous casting powder in synthetic oil.

During extensive plants trials, several benefits have been pointed out in operations and semis quality.

A sharp decrease of sparkling phenomenon was observed, improving operators safety and resulting in a sharp reduction of mold cleaning operations. Mold parts life was also significantly increased. Semis quality drastically improved due to strong dumping of distortion of billets shape.

A remarkable decrease of under-skin craks and sulphide precipitations was also observed.

Evidences of reduction in scale formation and a drop of B/O index were experienced
.