Flat Products - Rolled Steel Flat Products
Plate is rolled in the plate mill section of Evraz Highveld’s flat products complex. The continuously cast slabs are cut on flame cutting rolled beds to the sizes required for rolling and heated in a gas-fired pusher-type reheat furnace to the rolling temperature of 1 260° C. On discharge from the furnace, the slabs are subjected to high-pressure descaling sprays, after which they are formed in a four-high reversing mill stand to plates of the required dimensions.
The hot plate passes directly from the mill through a four-high roller leveler, which makes it perfectly flat. When the plates have been cooled, checked and inspected they are cut to final size by one of two methods: those of gauge heavier than 16mm are flame cut and the thinner plates are cut by shears. Finally the plates can be cold flattened if necessary.
Coils of plate and sheet or ‘strip’ are produced in the hot reversing strip mill section of the flat products complex. Slabs which will eventually become strips for coiling are first rolled in the plate mill down to a thickness of 35mm; this plate is then transferred to the strip mill by roller table. Before entering the strip mill, descaling is performed by means of high pressure water and the front and back ends are cropped by a flying shear.
The strip mill is a single stand, four-high reversing mill. In front of the stand and immediately after it there are two hot coiling furnaces which comprise of a coiling drum surrounded by a gas-fired, refractory-lined box. After each successive pass through the stand the strip is coiled on to the heated coiling drum and thus heat loss during the rolling operation is minimised.
When the desired gauge of strip is achieved it is run out of the stand on a roller table where it is cooled from above and below by water sprays to a carefully controlled temperature in order to achieve the required mechanical properties. An up-coiler situated at the end of the water spray system then winds the strip into the final coil form.
| Thickness | 5 - 155mm |
|---|---|
| Width (max) | 2 650mm (2 750mm untrimmed) |
| Length (max) | 13 000mm (10 000kg max) |
| Thickness | 3.0 - 16mm |
|---|---|
| Width | 1000 - 2000mm |
| Mass (max) | 27t |
| Mandrel Diameter | 760mm |