For the production of raw material 130 mm x 130 mm to 160 mm x 160 mm, a billet rolling mill works in direct connection with the CC3 continuous casting system. With this plant configuration, we are able to reduce the material throughput time to 4 hours.
By shortening the heating times or deformation without heat loss a large amount of energy is saved. In order to maintain the high level of quality, a high-pressure de-scaling is used before rolling.
The Billet Rolling Mill in Donawitz:
- Initial Operation: 2000
- Capacity: 180 t/h
- Roller dimensions:
- 130 mm x 130 mm to 140 mm x 140 mm
- 150 mm x 150 mm to 160 mm x 160 mm
- Lengths: 6.0 m – 18 m with 6 scaffolds
- Pressure water descaling
- Walking beam oven with hot buffer
- Warm and cold use possible
- Reversible cooling bed for high straightness of the billets
The pre-material or casting format with a diameter of 230 mm is rolled in several gauges on the desired cross-sections from 130 to 160 mm edge length. It is rolled without any twist and material-friendly, e.g. square formats with two dimensions ranging from 130 mm to 140 mm and 150 mm to 160 mm.
The pre-material is heated to a rolling temperature (~ 1,200°C) in approx. 60 min. It is rolled in 4-6 gauges in a diamond-square sequence onto the above formats. Cutting, subdivision and test cuts as well as stamping of the billets are carried out. After cooling on the calculating reversible cooling bed, the billets are stored or loaded.