CN1938110B - CSP continuous casting plant with roller hearth furnace and rotary conveyor - Google Patents

Abstract

The present invention relates to a continuous casting apparatus (1) comprising at least one continuous casting section, at least one reduction unit if necessary, at least one dividing device, and one or more devices (3) for strip annealing. To improve the productivity of such apparatus and to broaden the range of steel materials to be transported, it is proposed that the continuous casting apparatus (1) be provided with at least one parallel extending rolling line (8) having mechanisms (10, 10') for feeding steel ingots of different specifications into the production line of the continuous casting apparatus (1).

Description

CSP continuous casting plant with roller hearth furnace and rotary conveyor

technical field

The invention relates to a continuous casting installation comprising at least one continuous casting section, optionally at least one reduction unit, at least one dividing device and one or more devices for strip annealing and a downstream rolling train.

Background technique

So-called CSP plants (Compact Strip Production Plants) enable the continuous and significantly shorter production of hot strip. Liquid steel is poured here from a pouring tank into a distribution trough and from there into a mold by means of a submerged pipe. The crystallizer has the shape of a funnel which only reduces to two parallel broad faces in the last third of its height. The mold shape corresponds to the typical shrinkage shape of cooled steel. The funnel also has the advantage that the steel solidifies stress-free and defect-free. The shears then divide the thin steel ingot, which has solidified quickly and ideally in this way, with a thickness of approximately 50 mm, before it is heated by a continuous furnace to a uniform rolling temperature of 1150° C. Rolling then takes place on a finishing train designed for a width of 900 to 1600 mm and a thickness of 0.8 to 6.53 mm. Six or seven high-powered rolling stands are used to produce extremely thin steel plates, and finally the strip moves through a long cooling section to the coiler, which winds the strip into coils. CSP plants produce high-quality hot-rolled strip with favorable profile properties (Profileigenschaft), optimum surface quality and close dimensional tolerances.

Disclosed by document EP 1 363 750 B1 is a method for operating a slab rolling plant comprising at least one ingot production line and at least one rolling train and at least one ingot input device, which in terms of manufacturing technology Depends on ingot production line. During a production stoppage of the ingot line, the ingot feeder assumes the task of conveying the ingots to the rolling train to the maximum achievable extent according to logistical and/or production technology regulations. The other ingot production line is a thick ingot line, in which the ingot feeder of the slab rolling plant receives its ingots from an ingot warehouse in which prefabricated ingots are buffered according to manufacturing technology. These ingots are reduced to coilable thickness in a separate blooming train. The coils are fed directly to the rolling train after the casting plant.

Contents of the invention

The object of the invention is to increase the productivity and to widen the load to be transported in a CSP plant, that is to say a thin steel ingot plant.

This object is solved in that a continuous casting plant is provided, which comprises at least one continuous casting section, at least one dividing device and one or more devices for strip annealing and a subsequent rolling train, which is a continuous casting plant At least one rolling line extending in parallel is provided, which has a mechanism for feeding steel ingots of different specifications into the production line of the continuous casting plant. This increase in productivity is achieved by feeding ingots of different sizes from parallel rolling lines, allowing the best utilization of subsequent rolling lines and an unlimited use of steel material.

In an improved solution of the present invention, a rotary conveyor or a parallel conveyor is provided for feeding the steel ingots into the continuous casting line. This also makes it possible to inspect the steel slabs coming from the parallel rolling line for use and, if necessary, carry out the necessary post-processing.

In a development of the continuous casting plant according to the invention, the rotary conveyor or the parallel conveyor is at least partially an open hearth furnace, in particular a roller hearth furnace. An optimum heat conduction and an optimum temperature balance are thereby achieved for the incoming steel ingot.

In a further development of the continuous casting plant, the rotary conveyor has a transport direction opposite to the transport direction of the continuous casting plant, so that the entire continuous casting plant can be constructed extremely compactly.

In the ideal construction concept of a continuous casting plant, the parallel rolling line has an open hearth furnace and a blooming mill train with horizontal and vertical upset stands (Stauchgeruest) or plate rolling stands for the incoming The ingot is reduced to the initial thickness required by the CSP plant, for example between 40 and 70 mm. By means of the measures according to the invention it is advantageously achieved that one or more series-connected stand trains can be connected downstream of the continuous casting plant as finishing trains, thereby resulting in a marked increase in productivity overall and an efficient production process for the goods to be transported. Widened CSP equipment.

Description of drawings

The invention is described in more detail based on exemplary embodiments.

The accompanying drawings show:

FIG. 1 shows a CSP plant with a twin-line continuous casting plant with a parallel rolling line for feeding ingots into the continuous casting plant by means of a rotary conveyor and a subsequent finishing train.

Detailed ways

In the continuous casting plant 1, liquid steel is poured from a crucible boiler 2 into an intermediate vessel not shown in detail, and from this intermediate vessel it is poured into a funnel mold by means of a submerged pouring tube, wherein the submerged pouring The tubes are likewise not shown. From the funnel mold the solidified steel is diverted by means of guide frames onto a horizontal roller table where it is divided into thin ingot lengths by a dividing device. The thin steel ingot reaches the roller hearth furnace 3 so that it is heated there to a uniform rolling temperature of about 1150° C., equilibrates at this temperature and, if necessary, buffers it. The split thin steel slabs with a thickness of approximately 50 mm are fed into a subsequent finishing train in which the thin steel slabs are lowered to 0.8 to 6.35 mm in a plurality of stands 5 . The rolled strip is then fed into a cooling section 6 with a laminar cooling device (Laminarkuehlung), where it is then wound up into so-called coils with a coiler 7 .

In order to increase the productivity of the CSP plant and to widen the goods to be conveyed, a parallel rolling line 8 is provided in addition to the continuous casting plant 1, for example with a furnace for thick or medium-gauge ingots of conventional thickness and a A two-stand blooming train 9 or a plate rolling stand, by means of which the steel ingot fed into the continuous casting plant 1 can be lowered to a thickness of approximately 50 mm on the CSP plant. These ingots are fed into the CSP line from the outside via rotary conveyors or parallel conveyors 10 or 10' and are heated to the necessary rolling temperature in the roller hearth furnace 3 provided there and equilibrated at this temperature so that they can be subsequently The input follows the finishing train 4 in which rolling, cooling and coiling can take place in the above-described manner.

Claims (6)

1. continuous casting installation for casting (1), it comprises that at least one continuous casting part, at least one segmenting device and one or more are used for the device (3) of strand-anneal(ing) and the roll train (4) of a postposition, it is characterized in that: for described continuous casting installation for casting is provided with the roll line that at least one extends in parallel, it has the mechanism that is used for the steel ingot of different size is added the production line of continuous casting installation for casting (1).

2. by the described continuous casting installation for casting of claim 1, it is characterized in that: described mechanism is revolution transporter or parallel transporter (10,10 ').

3. by the described continuous casting installation for casting of claim 1, it is characterized in that: described mechanism is revolution transporter or parallel transporter (10,10 '), and described revolution transporter or described parallel transporter (10,10 ') to small part are open hearths.

4. by the described continuous casting installation for casting of claim 1, it is characterized in that: described mechanism is a revolution transporter (10,10 '), and described revolution transporter (10,10 ') has the transporting direction reverse with the transporting direction of continuous casting installation for casting.

5. by claim 1 or 2 described continuous casting installation for casting, it is characterized in that: described parallel roll line (8) has an open hearth and blooming mill row (9), this blooming mill row have level and vertical upset frame steel plate rolling frame in other words, and the thickness that is used for steel ingot that will adding is reduced to the original depth that CSP equipment requires.

6. by claim 1 or 2 described continuous casting installation for casting, it is characterized in that: described continuous casting installation for casting (1) back is connecting series connection frame machine row (5) as finishing mill line (4), and it has cooling section (6) and coiling machine (7).