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Descaling plants for continuous slab casters

Example of a descaler in operation in a slab casting line

The descaling plant comprises three sections. Firstly it incorporates all the components installed next to the casting strands, secondly all the components in the area of the high-pressure water pumps and thirdly the components making up the filter station on the low pressure side. The descaler features four piston pumps, two of which are in operation during the casting operation. The other two pumps serve as standby units. This provides the possibility of servicing or repairing the piston pumps during running casting operation. For setting the spraying pressure the piston pumps are driven by frequency-controlled electric motors. This enables the blasting power to be adjusted to the material grades. The spraying distance in this application is 120 mm, the maximum descaling pressure is 210 bar.

Descaling cabin	After descaling

The descaling of slabs in continuous casting lines provides the following advantages for downstream processing, especially in the hot strip or plate rolling mill:

The slabs are free from so-called Kelvin gaps, in which due to the scale on the slab surface temperature differences of 100 K or more are indicated.

The scale-free surface enables safe slab transport by magnets.

Due to the scale-free surface, inspection performance in the slab store is improved.

The descaling process removes the insulating layer on the slab surfaces, which would impair the heat transfer in the furnaces of the rolling mill. This saves energy during slab reheating in the rolling mill.

It is possible to directly charge the slabs into the rolling mill.

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