Flat rolling complex with 6-high and 4-high skin-pass mills
SMS group supplied three inline skin-pass mills for the new flat steel complex of Shandong Iron & Steel Rizhao. The ISPM are each integrated into the exit areas of a hot-dip galvanizing line and two annealing lines.
The produced cold strip is completely finished in two annealing lines and one hot-dip galvanizing line. All three lines are equipped with an inline skin-pass mill in the exit area. The annealing lines are 6-high, while the skin-pass function in the hot dip galvanizing line is performed by a 4-high. The skin-pass mills of the annealing lines are largely identical. They differ in terms of the strip width and thickness ranges they process. On the other hand, the 4-high skin-pass mill can process any strip dimensions and qualities. In all three mills, the roll change in the push-through operation can be done with the threaded strip, thus reducing the downtime and ensuring high productivity.
The dimensioning of the back-up rolls is identical in all three designs, which simplifies the handling and the provision of rolls.
Impressions
Main data
| Plant | CAL 1880 | CAL 1630 | CGL |
| Mill type | CVC® plus 6-high | CVC® plus 6-high | 4-high |
| Materials | CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, DQ-HSS, DP, TRIP | CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, DQ-HSS, DP, TRIP | CQ, DQ, DDQ, EDDQ, SEDDQ, CQ-HSS, DQ-HSS, DP, TRIP |
| Strip width | 1,880–1,000 mm | 1,630–900 mm | 1,880–900 mm |
| Strip thickness | 2.00–0.40 mm | 2.50–0.30 mm | 2.50–0.30 mm |
| Rolling speed | Max. 820 m/min | Max. 820 m/min | Max. 220 m/min |
| Capacity | 950,000 t/year | 650,000 t/year | 400,000 t/year |