Slab die-casting

The liquid steel is usually transferred to the ingot moulds by gravity, either from the chute (top filling) or from the spring (bottom filling).

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In this process, the entire ladle is placed in a vessel under compressed air pressure. The liquid steel is then forced through a refractory tube into a slab-shaped graphite mold above (figure 1 ).

The value of the compressed air pressure in the chamber can be adjusted at any time, according to a function whose variable is the height of the steel in the mold.

This makes it possible to precisely control a fundamental parameter: casting speed.

The water-cooled graphite mold, lined with a sprayed-on refractory layer, allows the choice and control of solidification speed.

This gives us a glimpse of the added value of this process compared with ingot mold casting, and how it can be differentiated from continuous casting in the case of special steels.