Metal founding – Means to shape metallic material – Continuous or semicontinuous casting
Patent
1985-02-28
1987-06-16
Lin, Kuang Y.
Metal founding
Means to shape metallic material
Continuous or semicontinuous casting
164481, B22D 1106
Patent
active
046730249
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a technique for directly producing a cast sheet (steel sheet) of not more than 50 mm in thickness from molten metal, particularly molten steel without a rolling step, which proposes a belt converging type continuous casting apparatus for the production of such cast sheets comprising a combination of a pair of metal belts and a pair of tapered side plates.
BACKGROUND ART
In a field of producing steel plates, it has recently been attempted to continuously carry out casting and rolling for the purpose of energy-saving, increase of yield, labor-saving, stock-saving and improvement of quality.
In a general method of producing cast sheets using the conventional continuous casting process, cast slabs of about 150-300 mm in thickness are produced from molten steel by means of a continuous casting machine and then subjected to hot-rolling and cold-rolling to produce thin steel sheet of about 0.5-2 mm in thickness. This method is excellent in the production yield, labor-saving and energy-saving as compared with a method of obtaining a cast slab from an ingot through blooming. However, when the casting rate is increased to not less than 2.0 m/min in the usual continuous casting machine, not only the smooth casting becomes difficult but also the surface and inner defects of the cast sheet increase, so that it is very difficult to connect the continuous casting machine to the rolling mills at a continuously operating state. Therefore, even when using the continuous casting process, in order to obtain a thin steel sheet, it is required that the slab is subjected to a rough rolling and a finish rolling after it is reheated at a uniform temperature.
If the cast sheets of not more than 30 mm in thickness can directly be produced from molten steel according to the continuous casting, it is possible to omit some procedures from the rough rolling step for obtaining thin steel sheets. Moreover, if thin steel sheets of several mm in thickness can directly be casted from molten steel, the rolling step can considerably be simplified, so much more it is possible to reduce an investment cost and a processing cost.
Under the above situations, there have been made various attempts for directly producing cast steel sheets for thin steel plates from molten steel. For instance, there are a technique described in Japanese Patent laid-open No. 54-61,036, a technique described in Japanese Patent laid-open No. 54-139,835 and the like, but they have not yet been attained to industrial scale. In these techniques, it is particularly difficult to make a broad cast sheet.
FIG. 1 is a schematic view illustrating an embodiment of the apparatus in which such attempts are more improved. This apparatus comprises a pair of endless metal belts 1, 1' arranged opposite to each other and supported by guide rolls 2, 2', 3, 3' and 4, 4' so as to allow their circulation while keeping a gap for holding casting molten metal over a constant distance, a pair of side plates (not shown) for narrowside planes of a casting space pinched between the metal belts 1, 1' and located near the both side edges of the metal belts, metal pads 5, 5' arranged behind the opposed portions of the metal belts, and cooling fluid paths (not shown) provided inside of the metal pads for cooling and supporting molten steel through the metal belts by filmy cooling fluid flows formed by flowing a cooling fluid between the metal belts 1, 1' and the metal pads 5, 5', from nozzles of the paths opening at the pad surfaces side the belts, whereby molten metal 7 is poured into a casting space defined by the metal belts 1, 1' and the side plates from a pouring nozzle 6 and cooled and solidified along the surfaces of the metal belts and the side plates to obtain a cast sheet 8.
However, in the construction as shown in FIG. 1, it is demanded that the size in thickness direction of the molten steel flowpath in the pouring nozzle 6 for supplying the molten steel into the casting space must be small such as several mm to several tens mm and also the thick
REFERENCES:
patent: 4582114 (1986-04-01), Saito et al.
Habu Yasuhiro
Kimura Tomoaki
Kinoshita Katsuo
Nakato Hakaru
Nozaki Tsutomu
Hitachi Ltd
Kawasaki Steel Corporation
Lin Kuang Y.
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