Dispensing – Processes of dispensing – Molten metal
Patent
1996-01-26
1997-12-02
Batten, Jr., J. Reed
Dispensing
Processes of dispensing
Molten metal
164437, 222606, B22D 1110, B22D 4156
Patent
active
056932499
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for supplying and exchanging a pouring tube in a mould of a thin-slab continuous casting plant, comprising an upper reference plate applied against the bottom of the pouring vessel and guide rails which can transfer a thrust force upwards and can guide the sliding of the tube and of a replacement tube through the action of a cylinder, from an initial position towards an in-use position in the pouring axis and from the in-use position towards a disengagement position, so as to enable tubes to be exchanged without removing the pouring vessel.
Its main application is in the continuous production of thin slabs involved in the manufacture of flat products, such as heavy plate and hot-rolled and cold-rolled thin sheet.
The invention makes it possible to transfer the technology, introduced by European Patent No. 0 192 019, for the continuous casting of conventional slabs to the manufacture of thin slabs for the purpose of having uninterrupted pouring runs from several pouring ladles.
Continuous casting plants employing an ingot mould or mould having an elongated rectangular cross-section already exist. They allow production of slabs whose thickness is generally between 150 and 250 mm and whose width may be up to 2,700 mm.
In existing thin-slab continuous casting plants, an uninterrupted pouring run is achieved by using several pouring ladles in succession, but, in fact, continuity in the quality of the steel is broken. There is no interruption in the pouring run, but a momentary interruption in the extraction of the slab which inevitably leads to downgrading of the quality of the steel during an interval of time which may be as long as 2 to 3 minutes when changing the tundish.
This lapse of time is sufficient to cause a major section of the slab to be scrapped, due to external and/or internal junction marks in the solidified metal as well as surface flaws and internal contamination which are due to the interruption in the stable process of continuous casting.
The present invention aims to provide uninterrupted continuous casting for a long period, enabling several pouring ladles to be drained in succession with a flow rate which ensures that the slab is extracted at a rate such that the quality of the steel remains constant throughout the duration of casting. At any moment throughout the duration of casting, the rate of extraction of the slab remains greater than or at least equal to a critical rate, that is to say greater than the rate below which the slab becomes degraded in terms of quality.
This object is achieved by virtue of a pouring-tube-exchanging device of the type described in the first paragraph of the present document. In thin-slab continuous casting, it is proposed to give the pouring tube a flared and flattened shape, in particular at the lower end of the tubular body.
It is obvious that such a flattened tube is highly stressed by erosion because of the high laminar flow rate on a small thickness of the film and subject to obstructions due, for example, to freezing of the metal which flows away as a relatively thin layer.
According to one feature, the flared lower part of the body of the pouring tube projects widthwise from the attached moving plate.
The flattened shape of the submerged pouring tube makes it easier, over the entire width of the mould, to obtain a uniform flow imposed by the constancy of the rate and the thermal requirements.
The invention makes it possible to have a long run for continuously casting thin slabs, that is to say having an accentuated rectangular cross-section whose thickness is less than 100 mm. These thin slabs are the starting point for manufacturing flat products, in particular sheets rolled in continuous rolling mills.
This technology makes it possible to prevent surface oxidation of the slabs as a result of multiple heating of the sheets during the rolling.
The upper end of the pouring tube carries an attached plate having a perfectly plane upper face which forms an integral part of the pouring tube.
The presence of a fla
REFERENCES:
patent: 3730401 (1973-05-01), Bode, Jr.
patent: 4669528 (1987-06-01), Szadkowski
patent: 4693401 (1987-09-01), Nishimura et al.
patent: 5173199 (1992-12-01), Bruckner et al.
patent: 5180536 (1993-01-01), Bruckner et al.
patent: 5351865 (1994-10-01), Szadkowski et al.
Batten, Jr. J. Reed
Griggs Dennis T.
International Industrial Engineering S.A.
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