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PRETEX®-plant
The microscopic examination of the surface of steel sheets is a major quality feature of the product. Unlike standard texturing methods, the new PRETEX® process also ensures reliable fulfilment of the highest demands for outstanding tribological reforming behaviour and brilliant optical painting characteristics for the future. The work rolls are coated with TOPOCROM® in a closed-circuit reactor system for this purpose. The defined PRETEX® surface texture is created by impressing the TOPOCROM® structure on the steel sheet during skin passing.
PRETEX®-Reactor
| PRETEX®-plant for structured and hard chrome-plating of work rolls | |
|---|---|
| Put into operation | 1996 |
| Extension/Modernization | 1998 / 2006 |
| Number of reactors | 2 |
| Electric rectifier | 2 (0 - 18 V/40 kA) |
| Controlling devices | 2 (Siemens SPS/OP 37) |
| Roll lengths | 3.500 - 4.700mm |
| Barrel Ø | 400 - 650mm |
| Layer thicknesses (structured chrome) | 50 - 120 μm |
| Mean roughness values Ra (SEP 1940) | 0,4 - 2 0 μm |
| Peak counts Pc (SEP 1940) | 60 - 180 cm-1 |
| Layer thicknesses (hard chrome) | 2 - 60 μm |
PRETEX®-surface of the
sheet with 100 ìm gradation
sheet with 100 ìm gradation