JPS58100904A - Train disposed with special continuous casting machine and hot rolling mill - Google Patents

Abstract

PURPOSE:To eliminate roughing mill groups and to roll a thin walled slab to a uniform width in the entire width by providing a heating means for the end part of said slab, a coil box and an uncoiling means. CONSTITUTION:A thin walled slab 15 is produced with a special continuous casting machine 11 and both end parts of the slab 15 are heated with a heater 17 for end parts to diminish the temp. difference from the central part in the broadside direction. Thereafter, the slab is coiled with a coil box 21 to form a thin walled slab coil 22 which is then cut with a shear 20 to prescribed sizes. The cut slabs are uncoiled with an uncoiling means 23, are descaled with a high pressure descaling device 2, are rolled with finishing mill groups 8, are cooled with a coolant 25 and are coiled with a coiler 10.

Description

[Detailed description of the invention] It is something.

A conventional continuous casting and rolling line was constructed as shown in FIG. That is, the hot water contained in the tundish 1 enters the mold 2, begins to solidify on the surface, and completely solidifies inside before the cutting torch 3 is reached. Then, the hot slab 4 cut by the cutting torch 3 passes through a slab yard 5. At this time, the flawed slab is cleaned, and while still in a hot piece state (200 to 800°C), it is reheated in a heating furnace 6 to a rolling temperature (around 250°C), and then rolled in a rough rolling mill group 7. Furthermore, after being finish rolled in a finish rolling mill group 8, it was cooled in a hot line table 9 and wound up in a coiler 10.

In the conventional continuous casting and rolling line, the minimum thickness that can be cast is 130mm, and the casting speed is 2m/t.
riyr is the limit, and as long as the oscillation method using powder is used in conventional molds, it is impossible to make the slab thin and perform high-speed casting. Therefore, a rolling mill with multiple stages and a large capacity is required, and during intermediate rolling with a rough rolling mill, the cooling of the rolling rolls and the accompanying temperature drop of the slab are significant, and in extreme cases, rolling becomes impossible. It may happen.

However, a continuous casting machine (hereinafter referred to as a special continuous casting machine) that casts a belt while rotating synchronously with the inner and outer circumferences of a pair of opposing ring-shaped rotating bodies was developed in JP-A-55-831.
1, it became possible to reduce the thickness of the slab.3 As a result, the rolling line could be arranged differently from the conventional one, but the effectiveness of the special continuous casting machine Although a rolling line capable of achieving this is currently under development, no suitable line has yet been proposed.

In accordance with the production of thin-walled slabs, which is a feature of a special continuous casting machine, the present invention eliminates the rough rolling mill group and performs rolling in the finishing rolling mill group. The object of the present invention is to provide a special continuous casting machine and a hot rolling arrangement row capable of rolling to a desired thickness.

The structure of the present invention will be explained in detail based on the embodiment shown in FIG. This special continuous casting machine 11 uses an endless belt 13.14 that contacts the inner and outer peripheries of a pair of rotary rings 12.12 and rotates synchronously to pour the hot water poured from a tantilage 7 into thin slabs of approximately 80 to 30 mm. 15 will be manufactured. In front of this special continuous casting machine 11, a hot surface flaw removing device 16 such as Horatos Fur is installed, and further in front is an end heating device 17.

As shown in FIG. 3, this end heating device 17 is provided with U-shaped heating furnaces 18 and 18' on both sides, and a plurality of burners 191 are used to heat the ends of the thin slab 15. It is designed to heat up.

A shear 20 and a coil box 21 are installed in front of the end heating device 17. This coil box 19 (
(see Japanese Patent Publication No. 50-30028) can be wound without a mandrel shaft, and a thin slab coil 22 is formed. And coil box 19
A rewinding means 23 is installed in front of the rewinding means 23, and a high pressure descaling device 24 is installed in front of the unwinding means 23. A finishing rolling mill group 8 consisting of a tandem rolling mill, a Sendzimer rolling mill, a planetary rolling mill, etc. is installed, and the coiler 10 winds up the material through a coolant 25° pinch roll 26.

This embodiment is constructed as described above, and the special continuous casting machine 1
1, a thin slab 15 is manufactured, an end heating device 17 heats both ends of the thin slab 150 to reduce the temperature difference with the center in the width direction, and the thin slab coil 22 is wound in a coil box 21. , and cut into a predetermined size using a shear 20.

Next, it is rewound by the unwinding means 23, descaled by the high-pressure descaling device 24, rolled by the finishing mill group 8, cooled by the coolant 25, and wound up by the coiler 10.

The present invention has the above-mentioned configuration and operation, and since the thin slab 15 manufactured by the special continuous casting machine 11 is thin, both ends are quickly cooled and the center part is heated to a high temperature as shown in FIG. Although there is a difference, the temperature difference can be reduced by heating with the end heating device 17, and when finish rolling is performed, it is possible to roll to a uniform thickness.

In addition, since the thin slab 15 can be directly manufactured,
There is no need for conventional rough rolling mills and heating furnaces, making it possible to significantly reduce equipment costs.

Moreover, after the thin slab coil 22 is once formed, finish rolling is performed while unwinding, so that problems caused by the difference between the production speed of the special continuous casting machine 11 and the line speed of the finishing rolling machine group 8 can be solved. Can be done.

Furthermore, the line length can be significantly shortened, and labor and energy savings can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional continuous casting line, Fig. 2 is a schematic diagram showing an embodiment of a special continuous casting machine and a hot rolling arrangement row according to the present invention, and Fig. 3 is a schematic diagram showing an embodiment of an end heating device. The cross-sectional view and FIG. 4 are diagrams showing the advancing position of the thin slab and the change in temperature, respectively. In the figure, 8 is a finishing rolling mill group, 11 is a special continuous casting machine, 15 is a thin slab, 17 is an end heating device, 21 is a coil box, and 22 is a thin slab coil. Patent applicant: Kawasaki Steel Corporation

Claims (1)

[Claims] In front of the rotary special continuous casting machine, an end heating device that heats both ends of the thin slab is installed, followed by a coil box that winds up the thin slab without a mandrel shaft to form a thin slab coil. A special continuous casting machine and a hot rolling array, characterized in that an unwinding means is provided in front of the thin slab coil to unwind and send the thin slab coil to a group of finishing rolling mills.