GB1318703A - Continuous casting plant for slabs - Google Patents

Abstract

1318703 Continuous casting; working at specified temperatures VEREINIGTE OSTERREICHISCHE EISEN-UND STAHLWERKE AG 26 May 1970 [30 May 1969] 25286/70 Headings B3F and B3V In a continuous slab-casting machine, when a water-cooled mould 1 is released and raised (as indicated in broken lines) out of a frame 2 in which it is mounted, an upright part 3 of the casting guide of a secondary cooler with a curved portion 6 can be lifted out through the frame 2; there is a curved part 7 of the guide, which is displaceable horizontally, followed by a withdrawing and straightening unit 12. The distance h between the surface of the metal in the mould 1 and the bottom of the vertical part of the guide and secondary (spray) cooler is 1À0-4À0 m. Two ladles 28 and two tundishes 30 are supported on slewable arms 24-27 and the tundish arms 26, 27 may be displaceable along a column 22 to immerse the tundish spouts in the mould 1. There are connections between the mould 1 and frame 2 for the cooling-water and for interfixing. The frame 2 is reciprocated together with the mould 1 and two pairs of rolls fixed to the latter. The curved guide-part 7 (whose rolls 8 may be of different diameters) may be replaced by guide 20 which includes a non-cooled portion 21 which allows equalization of the temperature over the strand cross-section. Alternatively, there may be a non-cooled unit between the guide-part 7 and the withdrawal and straightening stand 12. The latter also rolls the strand 11. The equalizing of the temperature is applied to rimming-steel strands. The stand 12 has a guide roll 15, rolls 13 (which, if they do not merely withdraw the strand, reduce the strand up to 30%) and straightening rolls 14 which may also exert pressure on the strand. The strand 11 may be reduced, if there is no temperature equalization, by the rolls 13 while it has a hotter core (greater than 900‹ C.,e.g. 1200-1300‹ C., compared with a surface temperature of 800-1000‹ C.) which therefore is primarily worked. This results in improved quality when there is subsequent rolling to obtain plates.