CZ336095A3 - Production line for casting slabs of medium thickness with a system of furnaces, storage facilities and slab arrangement - Google Patents

Abstract

A method and apparatus of making coiled plate, sheet in coiled form or discrete plate. The apparatus includes a continuous strip caster forming a strand of intermediate thickness; a shear for cutting the strand into a plurality of slabs of desired lengths; a slab sequencing and storing device; one or two reheat furnaces for selectively reheating the slabs; a feed and run back table at the exit of one reheat furnace; a single or twin stand hot reversing mill for reducing the slab to a coiling thickness in a number of flat passes; and a pair of coiler furnaces located on opposite sides of the hot reversing mill. <IMAGE>

Description

Technical field

The invention relates to continuous casting. slabs and a particularly integrated medium thickness casting machine and reverse hot rolling mill with flexible slab delivery, shifting and placement, and the ability to roll thin products.

BACKGROUND OF THE INVENTION

Since the advent of continuous slab casting in the steel industry, companies have been trying to combine hot strip rolling mills with continuous casting machines through continuous interconnection to maximize productivity and minimize the necessary machinery and capital costs. The initial effort in this problem was to integrate continuous slab casting machines in the range of 152.4 to 254 * mm (6 to 10 inches) with existing continuous or semi-continuous hot strip mill. The hot strip rolling mills included a heating furnace, a pre-rolling mill (or a reverse pre-rolling mill) and six or seven ready-made rolling mills with a capacity of 1.4 to 4.5 million tonnes per year. This arrangement corresponds to the current configuration of hot-rolling mills of large steel companies, and it is unlikely that new hot-milling strip rolling mills with this arrangement are likely to be built due to the high cost. Requirement of integrated casting machine with rolling mill for α

hot striping is not solved by the present arrangements. Furthermore, such prior art integrated lines have been excessively inflexible in terms of product variation and hence in terms of current market requirements.

These difficulties have led to the development of the so-called rolling slab for continuous hot strip rolling of thin slabs, which usually produce 907185 tonnes of steel per year, as standard products. These lines are integrated with casting machines for thin slabs - of the order of 50.8 mm (2 inches) or less. Such thin slab casting machines are increasingly popular, but also have disadvantages. Significant nevýhodý'žáhřnuj í ^_ ákvantitativní qualitative restrictions associated with odlévacímř. machine .pr.o thin slabs. In particular, the tubular form required to provide the metal for thin slabs can cause high frictional forces and pressures on the surface of the thin slabs of the slabs, resulting in poor surface quality of the resulting product. There are also casting machines for. bands of 50.8 mm (2 inches) thin are limited to the service life of a single tundish, which is approximately seven, due to the limited mold capacity.

Most importantly, however, casting machines for thin belts must necessarily cast at high speeds in order to prevent the metal from freezing in the pans. This, in turn, requires that the tunnel furnace, which is located just behind the slab casting machine, be extremely long, often of the order of 500 feet (152.4 m), in order to achieve adequate speed and still allow thin slabs to be heated (50.8 mm = 2 inches) that lose heat at high speed. Because the brother also leaves the furnace

... at a high speed, it is necessary that the multi-roll rolling mill 4 for continuous hot strip rolling be adapted to the rapid movement of the strip and roll it to the appropriate thickness. However, such a system is still unbalanced at normal widths, the casting machine has a capacity of approximately 725750 tons per year and the continuous rolling mill has a capacity of 4.54 tons per year. The investment cost of such a system is then close to that required by the prior art system to be replaced by such a system.

In addition, the scale loss in percent of slab thickness is significant for slabs of 50.8 mm (2 inches) thin. Due to the extremely long furnace, it is necessary to provide a long roller hearth, which is very maintenance-intensive due to uncovered rotating rollers.

It has been proposed that thin strips of the order of 1.016 mm (0.040 inches) are hot rolled from these two-inch (50.8 mm thick) slabs. However, in the case of low-carbon steels, the heat loss for a multi-table continuous mill is too high to achieve the desired finishing temperatures, and in the case of low-alloy high-strength steels, the 50.8 mm thin slab does not provide the reduction required for high-strength low-alloy steels. the consequence of a coarse microstructure, which must then be refined by a special heat treatment which is greater than that of cold-loaded microalloyed steel of the same class, and of micro-alloyed steel Nb-V microalloyed steel, N.Zentara, and R. Kaspar, Materials Science and Technology, May 1994.

The typical hot-rolled multi-roll mill also requires a considerable amount of work in the short term, which must be performed by higher-power rolling mills, which can sometimes exceed the energy potential of the area, especially in developing countries. Casting machines for casting thin slabs are also limited in product width due to the difficulty of using roll stands with vertically mounted rollers for 50.8 mm thin (two inch) slabs. Other problems associated with thin strip casting machines include keeping the various inclusions formed during the production of steel off the surface of the thin slab, since failure to do so could cause surface defects. Furthermore, current systems are limited in descaling because thin slabs lose heat rapidly and are therefore adversely affected by high pressure water otherwise used to descaling.

In addition, this thin strip manufacturing process can be operated in a continuous manner, which means that a breakdown anywhere in the process will stop the entire line, which is. often makes it necessary to scrap the entire product being manufactured.

The integration of the slab casting machine with any hot rolling mill requires synchronization of slab casting and slab rolling. Without the possibility of breaking the bond between casting and rolling in such an integrated system, a failure at any part of the process can stop the entire line, which may make it necessary to scrap the entire product being manufactured. The bond between casting and slab rolling can be effectively removed by providing the possibility of transferring cast slabs to the slab storage area. However, this solution is ineffective. The slab is transferred to the external slab storage area such that when the rolling mill is re-started, the amount of energy required to heat the slabs to the corresponding rolling temperature is needed. Various other attempts have been made to solve this problem.

For example, storing and storing hot slabs in a heating furnace or heat insulating chamber. However, these solutions also have drawbacks such as the need for storage space and cost.

SUMMARY OF THE INVENTION It is an object of the invention to integrate a medium width slab casting machine with a reversible hot rolling mill. Another object is to provide a system that adapts the casting machine speed to the speed of the rolling mill and beyond, and ensures that the casting machine is not coupled to the mill when needed. It is also an object of the invention to provide a system using less thermal and electrical energy. It is a further object of the invention to provide an automated system with low investment costs, acceptable space requirements, rolling equipment with acceptable energy requirements and low operating costs. It is a further object of the invention to provide flexibility in the delivery, sequencing and storage of slabs, and to economically adapt the system to the increased requirements for thin wide strips.

SUMMARY OF THE INVENTION

Our invention relates to a universal integrated casting machine and a rolling mill for producing at least 5896/0 tons of finished products, preferably for producing more than 987185 tons of finished products per year with the possibility of producing various products. Such a device can produce products with a width of 610 to 3048 mm (24 to 120 inches), and can routinely produce products of 800 PIW, with the possibility of producing products of up to 1200 PIW. This is accomplished by using a casting device with a fixed and adjustable mold width that has a straight, rectangular cross section without a bell-shaped mold. The casting machine is provided with a mold that contains sufficient liquid to provide sufficient time for changing the tundish during operation, so that the operation of the casting machine is not limited by the lifetime of a single tundish. Our invention produces slabs about two to three times the thickness of thin slabs, so that there is much less heat loss and much less heat energy is required. Our invention produces a slab with a much lower range of losses due to the reduction of the surface area per unit volume and allows the use of one or two heating or leveling furnaces with the minimum maintenance required. According to our invention, the present invention provides a casting machine which can operate at conventional speeds, casting machines, and conventional decoating technologies. Our invention provides the choice of an optimal slab thickness to be used in conjunction with a tandem return. a pair of rolling mills, hot rolling mills, while providing a balanced production capacity. Our invention allows the casting to be separated

Even from rolling if there is a delay at one end. Our invention ensures the storage of hot slabs if there is a delay in rolling. Our invention provides for easy removal of transition slabs formed at a time when the chemical composition of the molten metal or width varies in the casting machine. Further, the invention provides us with easy introduction of cold slabs into the production line. Such slabs may be slabs from an external source (i.e. slabs that have not been formed by the casting machine) and may be of a greater thickness than slabs that may be cast by the casting machine. Versatility allows production line operation to be controlled in accordance with

- 7.the respective capacities of each component and that the different parts of the production line are managed independently. This removal of slabs from an external source also allows the products to include steels of a quality that exceeds the capabilities of the steelmaking equipment that is part of any given integrated process.

All of the above advantages are realized while retaining the advantages of a low thickness casting machine, which include low ferostatic gradient, low slab weight, straight molds, shorter molds, smaller required mold radii, low cooling requirements, low combustion costs, or low capacity of scissors, and simplified machine design.

Our invention provides a slab casting machine. The mean thicknesses integrated with the hot strip or plate line comprising at least one heating or equalizing furnace adapted to receive slabs directly from the casting machine are from the collection and storage area adjacent to the conveyor bench that extend from the continuous 7 or from another region. One embodiment of the invention includes a slab magazine adapted to receive slabs from a casting machine.

The feeder and return conveyor is arranged at the outlet end of one of the heating furnaces and is in line with a two-rack hot-rolled return mill in which a rolling furnace is arranged on each side. In one embodiment of the present invention the feeder and return conveyor is associated with so that the heating furnace can optionally be bypassed. This mill stand can attenuate slab thickness of about 25.4 mm (1 inch) or less at a minimum number of flat passes, approximately three or four passes. Combined

the finishing line for coils, rolled plates, coils in the form of coils, or split plates is inserted downstream of the reversible hot rolling mill and the coiling furnaces. Finishing devices may include a cooling station, a winder, a table, a scissors, a transition to a refrigerator, a side edge trimming scissor and an end trimming scissor, and a stacker.

In order to achieve the necessary balance between the rolling mill and the casting machine, it is advantageous to cast slabs having a thickness of approximately 76 to 152 mm (3 to 6 inches), preferably in the range of 88.9 to 139.7 mm (3.5 to 5.5 inches) ). The term medium thickness slabs are used to mean such slabs, though

For example, certain steels may be of moderate thickness up to about 203 mm (8 inches) in thickness. The cast bars are attenuated to a thickness at which they can already be rolled, typically about 25.4 mm (1 inch) or less in four flat passes on a reversing mill for rolling. before the coiling of the intermediate products between the coiling ovens as they are attenuated to the desired thickness of the finished product. To provide the possibility of producing a coil plate and sheet in the form of a coil up to 1000 PIW a. Above, the slab width may be in the range of 610 to 3048 mm (24 to 120 inches).

One embodiment of the production line according to the invention comprises a casting machine for continuous casting of a medium thickness web with scissors inserted downstream of the casting machine for cutting the cast web to medium thickness slabs of the desired length.

The conveyor bench is in line with the scissors and with a slab loading and unloading mechanism adjacent to the slab conveyor. The slab collection and storage area adjoins the mechanism for loading and unloading slabs to deliver slabs to the area. At least one heating furnace is provided, the inlet of which is coupled to a conveyor bench for receiving slabs from the bench and supplying the heated slabs to a feeder and a return conveyor which is arranged at the outlet end of the heating furnace. A return roll mill for hot rolling is coupled to the feed and return conveyor to weaken the slab on the feed and return conveyor to. an intermediate product of sufficient thickness to be rolled up in a few flat passes. Two coiling furnaces are coupled to the feed and return conveyor, one being arranged in front of the return mill and the other behind it. The coiling furnaces can wind and temper the intermediate that is fed between these furnaces and through a reversing mill to be attenuated to the final product. After the coiling furnaces and the reversing rolling mill, a finishing line is arranged in line with them.

In the aforementioned apparatus, the reversing mill comprises a pair of quarto mill stands adapted to operate in tandem with an adjustable vertical planer disposed between said pair of stands. In addition, the slab loading and unloading mechanism comprises a first slab conveying device adjacent and transversely to the conveyor bench, the feeder and return conveyor adjacent to one end of the first slab conveyor device. The second slab conveyor device is adjacent to the feed and return conveyor, the collection and storage area adapted to receive slabs from the second slab conveyor device and deliver the slabs thereto. In addition, this embodiment may include a second heating furnace whose inlet end is coupled to the feed and return conveyor and the outlet end is coupled to the conveyor bench.

The method of making a coiled plate, coil sheet, or split plate according to the invention comprises providing a casting machine for continuous casting of a medium thickness web and composite scissors to cast a medium thickness web and cut the web into slabs of a predetermined length. In addition, there is also provided a device for loading and unloading slabs adjacent to the collection and storage area for transporting slabs between a position in line with the casting machine and the collection and storage area; ”.......- - - As mentioned above, one embodiment of the invention may include a container that consists of a vertically movable car adapted for. capturing the lower slabs and slabs of slabs, the slabs. in the column are in direct contact with each other. Insulation may be provided to surround at least the lateral sides of the column and its top. In one embodiment of the invention, the wagon may be mounted in a pair of rails within an insulated pit with a lid for closing the pit. In a second embodiment, the wagon may comprise one or two pairs of gripping arms to receive and hold the bottom plate in the slab column. The gripping arms are preferably movable to accommodate different slab widths, and include side and top insulating members attached to each; restraint arm. Top insulation. the members on each of the gripper arms are configured to overlap one another while allowing the gripper arms to move

J when adapting to different slab widths.

A slab originating either from the casting machine, from the container (if available) or from the collection and storage area is fed to an in-line heating furnace. The weakened edge is removed from this heating furnace to a continuous production line, which includes a hot rolling return mill, upstream and downstream of which a coiling furnace is arranged. The processed slab passes back and forth through a reversing mill to form an intermediate product with a coiling thickness. The intermediate product is rolled in one of the coiling furnaces. The rolled intermediate product is advanced back and forth through the mill to reduce the rolled intermediate product to the final product of the desired thickness, wherein said intermediate product is taken up in each of the rolling furnaces and removed therefrom at each pass through a return roll mill. The final product can be made into a coiled plate, a split plate or a sheet in the form of a coil.

The method of the invention also includes the possibility that some coiled slabs bypass the heating furnace when their temperature is sufficient for rolling, in addition some slabs supplied to the heating furnace may be removed from external sources (i.e., slabs that have not been cast on the casting machine) ). The external slabs may have a thickness greater than the slabs cast on the casting machine, or may differ in chemical composition from the slabs that can be produced in the melting / refining furnace associated with said casting machine. The reversible rolling mills according to the invention comprise a pair of rolling mills adapted for tandem operation, between which an adjustable vertical planer is arranged. The method of the invention may comprise a second heating furnace adjacent to the intermediate heating furnace, in order to provide great versatility in the delivery, sequencing and processing of slabs, as will be described in detail hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the invention are shown in the drawing, wherein Figures IA and IB schematically show the arrangement of a machine for casting the medium thickness strips and an in-line return rolling mill for the hot-rolling and coiling furnace according to the first exemplary embodiment. machines for casting strips of medium thicknesses and in-line reversible rolling mill for hot rolling and coiling furnaces with a set of heating and equalizing furnaces according to a second exemplary embodiment of the invention, 3A and 3B show schematically an arrangement of a machine for casting medium: thickness strips. and an intermediate reversible hot rolling mill and a rolling furnace with a heating and equalizing furnace assembly according to a third exemplary embodiment, Fig. 4 is a sectional view of one embodiment of a slab stack schematically shown in Figs. 3A and 3B; Fig. 5 3A and 3B is a side view of another embodiment of the slab stacker, and FIG. 6 is an elevational view of the slab stacker shown in FIG. 5.

Exemplary embodiments of the invention

An intermediate slab slab casting machine and an in-line hot-rolled strip and plate mill according to the first exemplary embodiment are shown in Fig. IA.

suitable for shifting slabs as described below. One or more electric melting furnaces 26 supply molten metal at the inlet of this combination of casting machine and track 25. The molten metal is fed to the ladle furnace 28 before being fed into the casting machine 30. The casting machine 30 is cast into a curved or flat mold 32 with rectangular cross-section.

The scissors 34 are positioned at the exit of the (straight or curved) mold 32 to cut a strip of already solidified metal into a slab of medium thickness, approximately 76 to 152 mm (3.0 to 6.0 inches), of the desired length and a width of 610 to 3048 mm (24 to 120 inches). ·

The slab is then fed on the feed and return conveyor 52 to the slab removal area, where it can be removed from the feed and return conveyor 52 by a movable slab conveyor 35 that extends transversely with respect to the feed and return conveyor 52. The slabs are moved by the transporter 35 to the transporter 36 to be loaded into the furnace 42 or. are removed from direct production and stored in a slab collection and storage area 40, in which various types of slab treatment devices will normally be stored. The establishment of an easily accessible slab collecting and storage area will allow breaking the bond with the casting machine and subsequent production. For example, if the rolling mill is turned off during casting, the remaining castings can be delivered to the slab collection and storage area. In addition, if the casting machine is out of order, the subsequent production can continue from the stored slabs. The collection and storage area 40 allows the individual slabs to be collected for each surface treatment to take into account the defects of the individual slabs.

A step furnace is preferred, but in some cases a movable hearth furnace could also be used. In step furnace 42, full-sized slabs 44 and split slabs 46 for certain plate-shaped products are shown. The slabs 48 located in the collection and storage area 40 may also be fed to the furnace 42 by means of pusher 48 or loading arms adapted to indirectly load the stepper furnaces 42 with slabs 38. It is also possible to feed slabs from other storage areas.

In case the slabs are fed from the collecting and storage area 40 or from outside areas, the furnace 42 must have sufficient capacity to heat the slabs to the rolling temperature.

Because medium thickness slabs retain heat to a much greater extent than thin slabs, a uniform temperature distribution is the only requirement in many plants. ”- In addition, for certain cast slabs, the internal 'temperature', in slabs, may be. as it is passed on to the feeder and return conveyor 52, directly sufficient for rolling. In such a case, the slab may be fed directly for further processing, bypassing the furnace 42. It is also possible for a second furnace to be arranged upstream of the (first) furnace 42 in order to increase flexibility and control of the system.

The various slabs are loaded into the furnace in the usual manner and removed by extractors 50 and placed on the feeder and return conveyor 52. A descaler 53 and / or a vertical planer 54 for sheet metal edges can be used for these slabs of medium thickness. A vertical planer could not normally be used for slabs with a thickness of only 50.8 mm (2 inches) or less.

Downstream of the feed and return conveyor 52 and the vertical planer 54 is a return rolling mill 56 for hot rolling, upstream of which is a coiling furnace 58 and behind which a coiling furnace 60 is arranged. The run-out table 61 and the cooling station 62 are arranged in a row a coiling furnace 60. A coiler 66 is arranged downstream of the cooling station 62, the work of which is controlled together with the work of the coil trolley 67, followed by a table 64 whose work is controlled together with the scissors 68. The resulting product is either wound on a coiler β 'and removed by the coil carriage 67 as a sheet in the form of a belt or coil or cut into sheets for further processing in a line. The sheet product is transported by a conveyor 70 which includes a cooling bed up to the finished production line 71. The finished production line 71 includes side edge trimming shears 72 and end trimming shears 74 and a stacker 76. Of course, the sheet product device is omitted if: only coiled or sheet products are required.

The advantages of the present invention result from the applied operating parameters and the flexibility of the workflow in the present configuration. The cast strip should have a mean thickness generally in the range of 76 to 152 mm (3 to 6 inches), preferably in the range of 88.9 to 139.7 mm (3.5 to 5.5 inches). The width may be in the range 610 to

Γ 2540 mm (24 to 100 inches), for product manufacture up to 1000 PIW or more.

The slab passes flat and back through a roll mill 56 with a minimum number of passes to achieve a slab thickness of approximately 25.4 mm (1 inch) or less. The intermediate product is then wound up in a suitable coiling furnace which, in the case of three flat passes, the coiling furnace 60 would be arranged downstream of this stool. Thereafter, the intermediate passes back and forth through a hot rolling stand 56 and to the coiling furnaces to achieve the desired sheet thickness in the form of coil, coiled rolls or sheets. The number of passes to achieve the final product thickness may vary, typically nine passes, including the initial flat pass. In the finished pass, which usually follows the exit of the coiling furnace 58 arranged in front of the rolling mill, the strip is rolled to the desired thickness in the hot rolling mill and continues through the cooling station 62 where it is cooled sufficiently to be wound on coiler 66, or handed over to the table 64. If the product is to be sheet or plate in the form of scrolls je--belt wound ~~ ^ to "navi ječce ^{7 -} removed ^- the carriage 67 for rolls. If it is to be converted directly to the shape of the board, the oder gives up. The sheets are then transported by a conveyor 70, which serves as a cooling bed, so that the sheet can then be made in a ready-to-use production line 71 that includes a descaler 73, a clipper 72 for trimming side edges, scissors 74 for trimming ends, and stacker 76.

A casting machine for continuous casting of a medium thickness strip and hot strip and sheet metal tracks has many of the advantages of a thin strip casting machine without its disadvantages. The basic structure of this equipment is adapted to roll 136 tons per hour on a rolling mill. Of course, market requirements will indicate variable production, but in order to calculate the required casting machine speeds to reach 136 tonnes of material per hour of rolling, production can be expected to be in the range of 914 mm to 1829 mm (36 to 72 inches). A slab rolled to 1829 mm (72 inches) at 136 tons per hour would require a casting speed of 1549 mm (61 inches) per minute. At a width of 1524 mm (60 inches), the casting speed rises to 1859 W (7372 inches) per minute, at a width of 1219 mm (48 inches), the casting speed rises to 2324 mm (91.5 inches) per minute, and at 914 mm (36 inches) increases the casting speed to 3099 mm (122 inches) per minute. All these speeds are within the range of acceptable casting speeds.

The annual proposed quantity may be based on 50 weeks of operation per year with eight-hour shifts and 15 shifts per week, ie 6000 hours of usable operating time per year, assuming 75% of usable operating time and assuming 96% traffic yield, so the annual proposed amount will be approximately 589670 pool.

5: ·

A casting machine for cast slabs of medium thickness and an intermediate track with hot strip and sheet according to a modified version of the first embodiment of the invention is shown in Fig. IB. The combination of the casting machine and the mill 25 is identical to the mill 25 described in connection with Fig. IA except that the single reversing mill 56 is replaced by a double reversing mill 56 for hot rolling. The double rolling mill arrangement 56 increases the track capacity. In addition, the double mill stand 56 allows processing of slabs from an external source having a greater thickness than medium slabs that could be produced by a casting machine 30. With the double mill stand 56, four flat cuts on the feed and return conveyor 52 (usually two cuts each time the slab passes through the feed and return conveyor 52) to achieve a thickness at which coiling can be performed.

An intermediate slab casting machine and an intermediate hot strip and sheet mill comprising a furnace assembly and / or a hot rolling mill assembly according to a second embodiment of the invention are shown in Fig. 2. The operating line in Fig. 2 is in many respects In one or more electric melting furnaces 126, molten metal will be provided at the inlet end of a combination of a medium thickness slab casting machine and a strip and sheet production line. Molten metal is fed into a ladle furnace 128 before it is fed to the casting machine 1307 Odlévacím'strojem 130 ^_ cast into a flat mold 132 zakřivenénebo rectangular cross shears ... 134 are placed at the exit from (straight or curved) of the mold. 132 to cut the solidified metal strip to. bramu střední .; thicknesses of desired length and optionally width of 610 to 3048 mm (24 to 120 inches). The medium thickness slab is then fed onto the conveyor bench 136. The flame-cleaning surface 137 may be positioned above the conveyor bench 136 for processing the slab surface. The slab may be removed from direct production and stored in the slab collection and storage area 140 or may be directly fed from the conveyor bench 136 to the inlet of the leveling and / or heating furnace 142. It is preferred that the furnace 142 is stepped, although in some cases could also be used kiln with roller hearth. The various slabs are routed through the furnace 142 and removed in a conventional manner and placed on the feed and return conveyor 152 located at the exit of the furnace 142. The feed and return conveyor 152 is coupled to the casting machine 130 in operational but not associated physically with it this was in the first exemplary embodiment.

When the slabs are moved to the collection and storage area 140, they can be removed from the transport bench 136 by a conveyor 138 for conveying slabs 38 transversely with respect to the production line. The transporter 138 transports the slabs 38 from the transport bench 136 to the feed and return conveyors

152. A second conveyor 144 is positioned adjacent the feed and return conveyor 152 for conveying slabs from the feed and return. conveyor 152 to the collection and storage area 140. In an alternative arrangement, the first conveyor 138 and the second transporter 144 would be combined into a single conveyor that would pass from the slab conveyor to the storage and collection area 140, with the feed and return conveyor 152 extending from the central portion a combined container and would take over the slabs from there.

The furnace 146 is located between the conveyor bench 136 and the feed and return conveyor 152 and adjacent to the furnace 142. The furnace 146 may have an inlet side facing the conveyor and return conveyor 152 and an outlet side facing the conveyor bench 136. it includes a treatment plant 148, where further surface treatment of slabs can be performed as desired.

The described double-furnace arrangement and slabs feeding and removal ensures great flexibility in slab production. As mentioned above, cast slabs from a medium width slab casting machine 130 can be fed directly through the furnace 142 at the feeder and return conveyor 152- and into the production line. Because medium thickness slabs retain heat to a much greater extent than thin slabs, temperature compensation will be the only requirement in many production modes.

This arrangement further ensures the transport of the slab from the production line on the transport bench 136 to the collection and storage area 140 by means of conveyors 138 and 144. Such storage may be required to allow continuous casting in the event of a breakdown in the production line beyond the casting site or allowing removal of individual slabs for further processing in the slab processing 148, for example due to the occurrence of undesirable surface defects. This arrangement provides great flexibility in delivering slabs from the collection and storage area 140 back into operation.

With a short delay, the slab can be delivered directly to the feeder, and the return conveyor. 152 by conveyors 144 for subsequent processing. The second alternative would be to transport the slab _; The conveyor 136 can then continue further through the furnace 142 and to the feed and return conveyors 152. for further processing. When cold slabs are returned to service, the arrangement allows the slab to be conveyed to the conveyor bench 136 through a heating furnace 146 which has the capacity to raise the slab temperature to a value suitable for further processing. The arrangement further provides the introduction of slabs from external sources into the production line. External source slabs are slabs that have not been cast by a medium thickness slab casting machine 130. Such stored slabs may have any thickness, including a thickness greater than the thickness of slabs cast by a medium thickness slab casting machine 130, and / or a chemical composition different from the chemical composition that can be achieved in the electric melting furnace 126 and the ladle furnace 128. The additional possibility of incorporating slabs from an external source into the manufacturing plant provides further possibilities for better matching the speed of the casting machine 130 and for supplying the slabs for subsequent processing.

An alternative embodiment of the present invention is that the furnace 146 has an inlet side facing the conveyor bench 136 and an outlet side to the feed and return conveyor.

152. In such an arrangement, the slabs are generally supplied from the collection and storage area 140 to the transport bench 136 and then through a suitable furnace 142 or 146. In this alternative embodiment, both furnaces would be controlled in the same manner. In the embodiment of FIG. 2, the furnace 146 can be utilized and controlled as a heating furnace, while the furnace 142 can generally be controlled as a buffer furnace.

Said arrangement further provides for direct transport of a suitable slab from conveyor bench 136 to feed and return conveyor 152 for post-processing without passing through any of the furnaces 142 or 146 as in the first embodiment. Such operation would only be possible if the cast slab had a suitable rolling temperature already in its entirety. This alternative further illustrates the flexibility of this construction.

The slabs arranged on the feed and return conveyor 152 for further processing further pass through the descaling device

153. As mentioned above, such a descaling process could be detrimental to cast slabs having a thickness of 50.8 mm (2 inches).

Downstream of the feed and return conveyor 152 and associated therewith is a hot rolling return stand that includes a pair of quarto stands 156 configured for tandem work. An adjustable vertical planer 154 for the sheet metal edges is arranged between the pair of quarto stools 156. The vertical planer 154 is intended for conventional use or for chamfering of the guide ends of the slab at the first pass through the stool to compensate for the edge widening that occurs during successive rolling. Such expansion can be controlled automatically, and the vertical planer can be passively driven by pairs of rolling stands. The performance of the bevelled edges can be monitored by means of width gauges at the outlet end of the hot-rolled reversing mill, scanning the width imprint and adjusting if necessary

Using feedback to a vertical planer; Upstream and downstream of the quaternary stool 156, a rolling furnace 158. 160 is disposed on both sides thereof. An exit table 161 extends from the rolling furnace 160. A cooling station 162 is arranged downstream of the rolling furnace 160, for example with laminar cooling. a flow that passes along the run-out table 161. Downstream of the cooling station 162 is a winder 166, which can be controlled in conjunction with the coil trolley 167. The downstream finishing line may be substantially identical to the example described above with respect to FIG. 1, including scissors 68, conveyor 70, finished production line 71, side edge trimming shears 72, end trimming shears 74 and stacker 76. The pair of reversible quarto stands 156 in the hot rolling mill of the present invention has increased production tonnage and also has the ability to achieve thin products, such as 0.040 inches, which are increasingly important in many industries, such as in. construction industry where thin rolled products are formed into beams to replace timber. The additional cost of incorporating a double roll mill instead of a single roll mill is justified by the increased productivity and adaptability and the incorporation of stored slabs from the collection and storage area 140 as mentioned above. As noted, such stored slabs may have a thickness greater than the castings of the casting machine 130 and thus provide an even greater variety of products. The following examples illustrate this diversity.

Example I

Coil sheet is manufactured that is 1244 mm (48.99 inches) wide, 1.016 mm (0.040 inches) thick, from a cast slab of 139.7 mm (5.5 inches) thickness according to the following rolling program:

Example I (tandem return mill)

22.22 tonnes ^{1000 PIW}

Rolling program for hot rolling 1244 mm (48,99 ') _______ - 139,7 mm (5,5000') _ / J ^ JJ ^ mm0, j04.0 ')

Time from the start with otnvůooxvotndmvovo ooto ^ tnopro ^ oo (hTPOlAtSUiffffyV) ΗΐΛΪ / κηηωωωω Η H d d 'W Length mm neiMíiNNOinr-xn Hdtnvo ^ t-otncoo ^ p H d in co d tn d Η H d Length track incodmHHA ^ comco w o d h r-td ^ rtnvooddd K d yp o o Angle and shot and degree. otn ^ ovotnamcovoo omvoodO ^ coOrtd t-t dc dd rt r (rl H rl : _u .. .... -1 E omncs ^ orinr®® p. o_d. <n.tn o_o what tn.in h.  '' '' '' '' '' '' '' 'T' otococococodHooo f> n d H Uber inches ointnooinujdcodo ονορνοηΗΊ'ο tn d o oinmoonrtoooo Η Η H % attenuation. PtndvotndOOOvoc \ ωβηποιηοίΛΜ'Γ dPWitw ^^ ddH Kalibr i mm oovdcovoindtno ^ vo o ^ dovuiwtrdOtnH OOiOOddtnOOrtO fflOlH ^ Uia ^ nrirlH en tn vo η h H Caliber inches οοοοοοωηοοο omoooinootnoo omtnoxrdoovo ^ tp tntn ^ rnvadHHOoo in n d h Name cylinders. stool WHddHHdMHHd Ufcb.tihfcfcfchb.tt. Passage C. OHdtn ^ tnvjotopo rH

continuation

Passage Name Caliber Caliber Entrance Entrance Output Output E. cylinders. stools' inches and mm tgplota temperature temperature temperature Noc: 2 ° C 0 FCE: 5.5000 139.700 2250.00 1232.22 2250.00 1232.22 1 TF1: 3.9350 99.949 2207.52 1208.62 2200.11 1204.51 2 TF2: 2.4300 61.722 2197.20 1202.89 2204.63 1207.02 3 TF2: 1.3700 34.798 2143.36 1172.98 2121.95 1161.08 4 TF1: .6400 16.256 2107.87 1153.26 2127.08 1163.93 5 TFl: .3250 8..255 2068.29 1131.27 2014.94 1101.63 6 TF2: .1788 4.542 2000.37 1093.54 2014.71 1101.51 7 TF2: .1073 2.725 1928.23 '1053.46 1934.41 ' 1056.89 8 TF1: .0697 1.770 1847.25 1008.47 1855.03 1012.79 9 TFl: .0470 1.194 1752.B2 956.01 1752.20 955.67 10 TF2: .0400 Ť. 016 1725.05 940.58 1702.53 928.07

continuation

> ‘Η -Ρ in □ CO O q —>> C_5 LQ LlJ '^ ‘N ^ SSCiS ^^ by mTj-JOfMOJcOsOr ^ O > N U HD> GJ Ξ Ξ what and a o Z! iS Jí 2 S Zí vi <*> ^σ Αί33 £ ίΖ £ Χ ^{θ0 Γ} > ^σ ' ⁰ * t- <ri d Performance kW o oSoSSSoooo o q o o o o o o oir oirjo ^ wrjrJr-r '' mn v> «> 3Γ £ i · · '' Os - - Performance in horses 1 O (Ί η Μ ij O \ rn (\ j Γ- '£) £ Tj-oovifooor IH - r (NfnraOm Cio ^' ¹ ^ «CN CN -i> -i - < Sat -HIM C r-1 <d e x a X 1-5 O Ό ω N CA> OQlt-> Tt oooooo ^ omM -’— r- <n omcooovicsoaosoovirO wi r- so so c \ vj tn cn cn o f — j «—1 τ — 4 · —1 O O C3 O O CO ΠΚ5 CLO -P □ -H C o o) in x Ε 1 O JJ Σ i-H O-tn cn-oos 2 ^: § 15 § $ gZm νΣγ-'Τγιπ ^ ο • SO > O □ r-l u ra i — 1 r — I X 'ra or > cn z or-vitor-sf ^ vistosví οΟΟ-ισνσχοοσχΟΓ-Γ '-' Τ gmr-osovioocNtNTrcn O <N rn - <<NC \ r ~ 00 V} - <so o cn st κο oo rl knows more about tN tn —r - »-i» - CN r ^- · sO • o > <—1 O u ra x r — 1 ι — 1 ra or q> tn t-i OOOOC \ Tfr-o5t-nm OO> -fS ()) rsChMid (JnnnnnnOfnsrvi ^ r-O or-cNtooosnnr-oso o c4 cn cn sf tn tn st cn Caliber mm RS Pi S 8 8 ag! p 2 Ξ Si Si 3 S 2 «*« ^u - - Caliber inches Network ⁰ '*' ¹⁰⁰ ^ ⁰ ' ¹ - · © tn cn -J ....... Name cylinders. stool Network Passage C. o - cstnstvisot — οοσ ^ ο »“ 4

Distance / Length Ratio of Maximum Production of Returnable Tandem Stool Rolling Begins at Pass Number Tandem Passes Begin at Pass Number Distance between Cfce # 1 and Stool

Distance between stool and Cfce # 2:

Roller furnace diameter

Rolling furnace temperature

Acceleration / Deceleration The final body temperature on TS

0.5000

1713.44 bpm * TFI * * TFI *

10.7 m (35 feet)

10.7 m (35 feet)

1371.6 mm (54.0 inches)

898.89 ° C (1650 ° F)

1.27 m / s2 928.07 ° C 1702.53 ° F

Example I illustrates one of a wide variety of product types that can be rolled in a given system. As exemplified in this example, the track can be economically hot rolled up to a thickness of 1.0 mm (0.040 inches). The double-stand arrangement enables precise rolling down to these small thicknesses, which are increasingly on the market.

Example II

Coil sheet is produced, which is 1397 mm (55 inches) wide, 1.52 mm (0.060 inches) thick, from a cast slab of 139.7 mm (5.5 inches) thickness according to the following rolling program:

Example II (tandem return mill)

24.9 tonnes 1000 PIW

Rolling program for hot rolling 1397 mm (55,0 ·)

- 139.7 mm (5.5000 ') / 1/52 mm (0.060 *)

Time from the start with >ί> σιωΐΛβο CO <r (Mr- * U> OCOtNHH Η «4 · 5j> Ο γΙγΙϊΝΓ'Γ ' J ι — ι μ CJ η η Length m ίηωσ »Γ-ιν> σι, 3 · ΐΛοθησ \ lOM ^ ioineorniemHin riNninom ^ oinr-o η η η w σι ν ς ¹ Η Η Length track inr ^ io0 ^ cicsr-mocQ ΓΊ ^^ ρ ^ νβσΐίΝσισϊΗΓ ' in? r-ieoTPHcScoťNr-o HrlnuHOf-irttn Η Η η ττ Angle shot degree ΟΓ'ί'η ^ ηωτ’ΓίΓίΟΓ ·· ooooHíp ^ oomnN ^ j ' r R d rl rl Hive «E e η ε OMO ^ inmOc-tn-caco oiocoiooinr-inmincN oowtfaoiwNHoo m η w h Removal inches oooooineooirrnH ΟΙΟΓ'Γ'ΐηΓ'ΠσΐΐηΝΗ o ιη η σι r * m o o o o Η H % attenuation. OTaSt-CTlrdOr-lTltOO β-D-coowinin Caliber j mm OU10000 / lrfClOfW or .alpha., .alpha Γ'ΕΝΝνοιηοπΓ'ΠΓ'ΐη ωοιηοΗηιωηΝΗΗ ňOUHp N Η Η Η Caliber inches ', 1 oooooooohido □ οοοοιλμε ^ οο o ^ r-oinr - ^^ oi ^ io ιη σι ιηιοον-ΜΗοο ο ιη η ο π Name cylinders. stool KrtNtNHHMNHHN Ο U. Ct., Cu Et. tu fc tu b tu tu khPhPhhkkhh Passage; e.; OHnrwwior-eooio From d

continuation

Output temperature N © Nidn®ninoco> ΝΝΟονοιηοηΡ'Φσν ΜΐηΓ'ΟΗΗπωοοιησ » rtoor-Mninoiùoi ' Μ (Ν (ΊγΙΗγΙΗγΙΟΟ <Λ) HrIHHHHHHHH VH c ra C.4-> □ O b_  + »RC w a a > +> OiHmrjnffitnmwioij ¹ omuooi ^^ Okaf '^ ΟΗΦεοοΦΓ' ^ ιηΝίη mooma * oon tn a * σν (ΊΙΊΜγΙγΙΗΗΟΟιΟΓ 'NNNNNNNNHHH Entrance temperature MTfr-nmHOcor · * ·. · «« Ntnnov © voA <U) ONN no o MB fl * fl * 0 'S H' th 'NNNr-ti-IHHHOOCv HrlHrHrHHHrirlrl Entrance tgplota o ^ tDOrioajmfl · ® ^ 0ΝΓ '£ ηΗ0Νπ <ηω> otO®fl * f ^ © Nfl * ®fl * ® ιησσιιηΝσνσνΝίηιηΗ cj η h rd h 0 0 0 <n.®. ŇN NN N N NN t-ΙΉ H Caliber mm ocnuooinflcionfl or - Γ'-ΝΝνοιηοΝΓ'ηΤ'-ιη OVOlílOrdNVOPINrlrl m o vo * n η r4 i — Í Caliber inches OOOOOOOOHVOO o®oootnr- © A «oo ΟΑΓ'ΟίΠΓ'Α'ίΟίΜΰ tn <hinvDoofl * NMooo inno h Name of cylinders. stool j tlHNNrdHNNHHN th E- * E · ¹ E · * t- * E- * E- * E- * E- * E · * H Passage C. OH <Nn ^ m \ Dr.o {j \ o H

 continuation

10.7 m (35 feet) 10.7 m (35 feet) 1371.6 mm (54.0 inches) 898.89 ° C (1650 ° F)

1.27 m / s ²

Maximum production of returnable tandem stool 241.47 t / h

Rolling starts at pass number 4 * TF1 *

Tandem-Steep Begins When Passing Number 1 * «F1 * * Distance Between Cfce # 1 And Stool

Distance between stool and Cfce # 2:

Roller furnace diameter

Rolling furnace temperature

Acceleration / Deceleration

Final body temperature at TS 979.97 ° C

1795.94 ° F

Example ΪΙ, similar to Example I, illustrates the adaptability of a given system to. Rolling on. These thin-rolled, thin products, for example: having a thickness of about 1 mm (0.040 inches) and about 1.5 mm (0.060 inches) can be used in situations where the end product is generally not exposed to the weather and does not require surface treatment. Metal structural pins, for example 1 mm galvanized pins, are one of the end products that can be hot rolled according to the present invention. This is a significant advantage over the prior art, in which it would generally be hot rolled to a thickness above 2 mm (0, 080 inches), then the product would be pickled and finished by cold rolling followed by annealing and cold rolling to cure the sheet. ,

Example III

Coil sheet is manufactured that is 1574.8 mm (62 inches) wide, 2.3 mm (0.090 inches) thick, from a stored slab of 254 mm (10 inches) thickness according to the following rolling program:

#>

Example III (tandem return mill) 28 tons 1000 PIW

Rolling program for hot rolling 1574 mm (62.0 ') _____________ - 254 "mm". (.10., _ Q L) ./_ 2 ⁰ ' ⁰⁹⁰⁰ ' ^}

□ + J Hive ra -u> tn tn tn ra ό o ΟΗΛοοσισιΓ'ΗΟΗΟΠΗνώνΟ OHHniaujmMnoco ^ one three mCOfNr-lDOJCNVOCSOJtNLntDtO HrlNmkOtariNfflCnr.t '· rtrirt rt ΝΠ ra OinuXTliflíJOrtOnrtPtOtíl ^ JC OlONl / lHOíOQtOrttDtůfflr-t- fS ιΗΗΗΝιηκβηηιηιΠΓ '^ Λ Q rt m rn m> oo cn , what <n n tn-tt-trininein MVontftM (I ® CD flO N .se o ' Nn ^ tnr-ointo ^ inyitDoeor · rtrtC \ rj <r'rtCflCNr-M kd tn o rt rt d Ν Π O’C OMrtMMOUlrtrtffltO ^ rtrtrt Ul o ortrtrtrtnr- ^ rj ^| N <JiOrtCD y-d XU O- . tu.n..o. X K5 -P '3 n tn :: O b d f «b t0 dji Nthřinrtrtdrl rl Η Η Η H rl rl Ui ortnrtMiůrtincQriiflncictri ocomooN ^ ototuTfoiHcoir KU E OWtDtO ^ OCJVĎCTirttOnrtrtOO £ ^ε o mnnnncNrtrt  -. .0) ·. and : o. O.O O-O OO O-O-U> '© -5P'> VD u ' oinLnininp-tolniot-.fSP-dřcNrt C-ι Φ ro OKP ^ dPdrOJOr-drtNrtOOCiO n Q. o R Η Η H rl d 5 ra ΟΙΠΟ ^ ΜΊΝγΙγΙΝΟΟΟΟΟ. ι — 1 tn κτΓ-'ΟίΛονοοΗΗΐηοιηοω HHrtdrtrt ^ K ^ rtrtNrtri Hive oooooncooo ^ · or ^ dprtcortcri ^ ujofriirtnoco ortmtntoKfxr ^ t ^ inooovooseo X) • · · · · · ·. . • o ^ dftnyjM Ή _c ^ ['' Ontxjdfr-tDuj ...... CD = inrtCOiJOr-iJiíNrtGUCKIrtfqd X (N N rt rt rt u ω OOOOOOOOOfflritlWffiO οοοοοοοοοΓ'Μωπιηο oinomofnbdMJfflLnMOOai -Q by η Ή OWritCrtChCOrttflrtCJrtHrtO r-ι 2 ocoM / iuMrtri id • here >> o φ O .rd Ν Htí WrtddrtrtrtdrtrtNdrtrtrt 13 ko or - &> tn ^^ Ιΐ4Ρ ^ ίΖ4Ε £ «κκ4 [Ζ4 & <Εχ4ΕΏ (^ ££ ιΕΐι [ΐ | Cu E- * Εη'Ε-ι h F Η H h h Η Η Η H Ό O -C at · □ KJ OrlMrt ^ UHarOD1Orldrt ^ Hive id id id id id CL ·

i continued

Output temperature ! _C _ Minroaj ^^ tririffiMnriuirO MinotNeoyjr.intnoMňcNi-io (NCOM ^^ nocoujNOíMomr · rOrlfHHriOOUHfKftfrlaXŤN (NCJCÍDMMMHHHHHOOO ΗΗι-ΙΗι ^- (Ηι-1ΗΗΗΗΗΗρΗί ^_ ( Output temperature om ^ rirnnrjrwfiinuinoo ΟΜΛΓ'ΜηίΠΜΙ'τΓΐηΐ'Λω ootor-eotopiamine-TPiNior-o l / l (N (Nr OlmNdMH1-IHHOOOCnmffl CJMtNDNNMíNMNMNHrlrl Entrance temperature ΜΙΟ ^ Γ'Η ^ ΟΟ'β'σίΓΊΓ'ΚΗΠ [Nu®i / i®noD®oif. m f? r h NOl ^ lmrlODOU) .. O O WJ n H rd H i-O O VJ V> Π Γ ', rl ® << m rjtNtN «MNNHrlrlHHOOO rlrlHrlrlHrlrtrtrlrlrlrlHrl Entrance tgplota ocortinr-'Ori ^ L / ir'fir'i? οιηΓιΟΟ ^ Γ'Οίησ, Γ '^ Γ'Ο'Τ or-oin-tin-H-i-ooc nNCNtNCMrlrlrlrlOOOmffiOn N (N (N (N CM (Ί (Ί N «N Cl H d H)) Caliber mm 1 oooooMeoco ^ rommmouj or-T ^ weoMtn.pvjLnocovjoico OrHninkDxf ^^ r-OTr ^ n ^ otM -. -...... ΙΪ1Η® ^ ΟΓ’'ίΜΗ (N CM H rl H Caliber inches οσοσοοοοοαα ΗΐητΓσ »οο ooooooooor-MVJtsino o ui o m o r ro>>> o>> / / / / / / / / / / / / / / ΟΟΓ'ϋΊίΝΓίΓΐ H Name of the Vaccum. stool ¹ [ÚHCMNrldNNr1HNNrlr1N ΟΙϊ. &. [Ϊ́4 & ι [£ .Γι.ίι. &. &. &. &. &. [Ι.Ε (< ΙΐιΗΗΕ-ΕΕ-ΕΕ-'Ε-'Ε-'ΗΕ-'Ε-'Ε-'Ε-'ΗΕ- ' Passage E. oHCNmtfuiror-ooiOdiNntf Η Η Η Η H

continuation

Μ) + J o C.-I <D E X □ 3: n oumrWrit-rtrtooliniflart onri ^ moo ^ rj ^ ricnrimt ococot ^ r-n-vjocNHCN ^ mifici o r- r- r- c * r- r- ω cn <λ cn η cn h o O-H-C ^Hi-4HHOOOa00 fOO O .o + j o i-l c +> tu cn x Ε 1 O JO Σ. i-i oeiocoinint ^ mvirr ^ CNr-a) Οθσ \ θσ \ Η (θηΗΓ · ^ · 'β' (ΝΓ · Η) oocnHOHOiajor-coinr-HC ' Of * lfNr> m? *> FNHO> MJCOCNH-tO Η Η Η ι ι-Ι Η Η. • \ 0> O ____o. _ □ CO '<—11-4 κ * c sh,> tn s ¹ OrlCOCDrHmOr-øCnHtftr-COl o ^ mCD ^ MCN ^ DOlOPIkClick οαΓ'ΛωΜ ^ Π'τΟι’ΐΟΓ'Γ'Π _o. 5? _5Í. injjn.CD.Cn tf O> .. Ul.r-1_, 0> .Cp__00._ rd rd i — t rd rd rd rd-rd rd rd -rd rd rd \ 0 • o> 1 o ro x «—i, —i 'ro' rH X3 ¹ > cn <-t oooriraiNfinnnoowrJN or ^ ojeocNro ^ ucncDtpcN ^ U) οιηιηοοΓ-Ηι-ΐ'ΐ'ΐηίΓινοωσίΈρω. O-cn-cn.cn cn-in co. h. o_oy.cn_oy-v> -Ν · _σν onnnnnntfnnnin / cn cn h Caliber mm ooooocNcocotrOfommoto o> <s cncn ^ KDinococDCňa) OHnLnLD ^ tfkfr-co <· <r η \ o cn .alpha., .alpha ιηπΟ'ίΟΓ-'ϊΓΊΗ Cl N rl rl rl Caliber inches ooooooooooHin ^ cno OOOOOOOOOOCNCDNinO OLfiomomr-cNkocoint ^ power oirtHtocNoiajHkocncNHHHO οωΓ ^ νη ^ πΗΗ rd | Name cylinders. stool UHCNCNHHCNCNHHCNCNHHCN CJ & .Ei.Ciikitu & .Ci.Ci.CuCi. &. CijCi.tu ^ Ε-Έ-ΉΗΗ ^ Ε-ΉΗΕ-ΉΗΗΗ Passage C. ΟΗίΊπ ^ ιηΐύΓΌοσίΟΗίΝη ^ H rl rd d rd

continuation

Effective. time sec. ΟΗΟΛ ^ 'ΝΟΟΰΟΝΟ’ίΓ'ί' ' ininoo ^^ or-NOrinn ^ rlHiNNr4NiHWnrl Η H Load. ratio oooHcoNcsfliMnMnocMn Ortho, innocentino \ inH 0ΗΟ (ΝΝΝΗγΙ <# 1 / ΙΛΓΌ10Φ) OMDíNrjnfNOODOr-MJ-ICJ OODCNCNOltNCNHH Performance kW οωΗΐη ^ ωΓί'ΌΜ ^ Γ'Γ'ΓΌοη μ * η Η σι σ \ η σ \ ιη σι cn mm vr ¹ Ď ^ ůHHHaaHinnonorjMO ιίΓ'ΙΰίΝ ^ ΓίνΟΓίηΗΟΙ '^ ΡΪ Performance of horses Ororium-aminocyanate Tfn ^ urr-tncDtDOCDi / imcDco UDVDHr-CTiCPif-IkDLnrjOOr-kOO σιηΜ ^ σιΟΓΊΕηΐ'ΐηοοιίΛ ’^ H 01 (N Μ Ί ΠΊ CN CN CN Η H Caliber mm oooooMcom ^ Ortrtnovo or''íH (DW (? i <i \ Dinow'íimffl ΟΗΠίη'Λ ^ 'Φ ^ ΓΌ’ίτΐ’ΠωΜ ^ Γ'οηνΰ'ίΓ'οωσιω'ί'ηΐΝΜ indCDf10 ^^ Nrl MO rl Η H Caliber inches οοοοοοοοοεεοι-ιιηττσιο οοοοοοοοοΓΌ ^ οιηο owoNoNioeouir-mom OlrtrlkDMGlCOrUůnMHrlHO O CD Mfl d rl H H Name cylinders. stool UrtMMHrfMMrlrlMMrlHM UCL, U, & L, [ijIiiCi.U.CLiCij £ x4tiU.Ci.U, Cn H h HH Kh Ε- * Ε- <Ε-> Ε-Έ-ΉΗΗ Passage C. ri Η rl Η Η

Maximum production of returnable tandem stool 366.22 t / hour

Rolling starts at pass number 8 * TF1 *

Tandem passages begin at passages črsló l ^_ * ^'_ * Distance between TFR # 1 Cfce faeces and 10.7 m (35 ft)

Distance between stool and Cfce # 2: 10.7 m

Roller furnace diameter

Rolling furnace temperature

Acceleration / Deceleration

Final temperature, solids at. TS (35 feet) 1371.6 mm (54.0 inches) 898.89 ° C (1650 ° F)

1.27 m / s ² 1027.00 1880.60 ° C ° F

Example III illustrates the adaptability of a given system into which it is possible to load stored slabs for further processing. Such stored slabs may be - as in the present case - slabs that are too thick to be cast on a medium thickness slab casting machine, or slabs having a special composition that limits the choice of equipment in which they can be cast or simply additional slabs to supplement the casting machine products. Rolling the stored slabs and the ability to store cast slabs allows the bond between casting and rolling to be broken and their operation controlled independently of each other.

Example IV

High carbon steel sheet (0.51-0.95% carbon in coil form) that is 1219.2 mm (48 inches) wide /

3.175 mm (0.125 inches) thick from a 139.7 mm (5.5 inches) thick slab according to the following rolling program:

*

Λ ¹

Example IV (tandem return mill)

27.72 tons ‘1000 PIW

Rolling program for hot rolling 1219,2 mm_ £ 48,0 /) * ........... 139; 7 mm- (5, -500 ') / 3,175 mm (0,1250'

□ d- » (4 ra + » tn vs VS ra Ό KJ O ovůcowmtnoeoMOO co ^ o ^^ rinr-oo Hniododiinuinn cl rl (ΊΊM Length m ΛίαιΟφΗηφΓΊΐηιβο (OMl / l ^ rlOlUUOOm ΗΝίηιίΐσιωιηυσίΓΙΗ riMfW ΦΓ · - ra ra a 2C o ^ d + j KD cn o ina3cntno (ncno \ r4ivffl ΙΠΓ'ΗΓ'ίΛΠ '^ ΟΟΟΙΛ HHCJinmcNiDOn rl rt Ί (Ί Angle; Shot: Degree ί ooocnoin-Tfr-fMCN ΟΟίΗΓίΓ-ΠΙΠωσίΓΉ rtC-mH Η Η Η Η nu E • š ^e OlfKOC10nr-r-rHO O ^ OlHCOtaňOLTCriLT oouncíioowNrioo η π o η rd Llběr inches oviinoinmoincMkocN ΟΟΗΓΊώΜΗΟίΟΠΝ oin ^ o and ^ ciriooo ’Η Η 4 ra (0 r-4 ω · '- p auioinnHtnonrO ωω ^ οηΓ'Οίησιΐη Caliber mm ocnoococcus L l rl rIMťřiCN ^ rOC * xnoffiCNajNiar-H c ^ o ^^ f-iui ^ coví ř Ch Ch co Ch co S r CN rd rd Caliber inches ί OOOOOOOOOOO owootnooinnr-in ιησιιηωσίΐηπΜΗΗκ ΙΛΠΝΗ Name cylinders. stool WrddfNrdrdfNfNr-1HCN UUiCLiCLib.bib.CtabuCbCu [Passage E. , 1 OHNn ^ m ^rOffiO rH

fc sequel

Inlet temperature Noc: 2 ° C Difference oaintoriniommtor ' oinHcinNHinmriNin inr rnn End NNrOnr-nrirO)? η H O O (O O γΙΟΙΟΦΌ MdMNHHHHOťTiO HHidHHHHHH Forehead (ΜιηΗ'ίΓίΟ'ΡίΓίΛΜΛ ΝΠαίΟΟίΛΙΙΚΟΓ-ΝΗ nr-tOtĎUOin-TININOMO NflNrlHrlriOOOCl HHrlrlrlrlrlrlrlrl Inlet temperature ° F Difference «□ ['' ΜΦί-ΜίΛνοσιΗΟ OOVOrtííVjndffi '? η r- ^ inninnr-in H End OtfrlrttDNr-lONCDd ο ^ όοπιΓιχι ^^ ιογLnrlOOONflrllfir · '^ dNNNdOOOChr-I '· ΟΙΝΝΝΝΓΐΙΝΝΗΗΗ Forehead οθ'ίΐ / ΐΓ (’Γ (ίΐοησΐΓ ' otfiooiHOcnnťAMinfs incNOnNHm-anu NtNDHHHOťDeoeot '· NNfJNMMWHHHH unu OfltOO <h <fffffl> fin o t-power mui ^ duwcowiøMri m <n u> <α <η <d H Caliber inches oóooooooooo otnoomoouinMn orncsincovoin ^ co ^ tN inmuiioolinNHHH w d Name cylinders. stool WdONddNnddN UU.Ct.U.U. & .UiU.t.CLiU. h h h h h h h h h h h Ό O X u * O XJ i-1 and- Orld ^^ inUJOOOOO i — 1

Outlet temperature Noc: 2 ° C Difference οπ'ΓΓίΓ-ς'ίοσιΟ'τω ONOtOinNmiíMn ΝΗνΝΙΛΝΗΗ End Mr-dmmujrirriNca MOnococonnoiHM ΠΟΗΟΟΟΟΗΜΦίηΓ'Μ) »Σισ » rldddrldrtdd □ ř-H O O (ΊΟΦΦΓ'ΟίηαΐΗί'Ή NwnnjcocNinmnajf ('IdrHOlOlWfOfOO'? NMCIddrtdOOQm ddddddddd Outlet temperature ° F Difference θΓ · ηυ> ΝΦΦ ^ Η (Λ ON (Orl <? U) UlHíritf h. S ό · σ »ιη m r- in rd End o ^ drifflNr-urj and> ‘v> O ^ lflfDrllílVWtflOr ·· uidooaMndi / ir-U) csrírjnHOOOcnr-Γ 'N N (Ί Forehead ΟΟ? 1/1 ^, Ιί1Ο ('1 (ΛΓ' oineoHommoicitfioí innonojdtnrOnu) fNMMHHHOooeoeor · NNNNNNNdddH Caliber mm οσχοοσι ^ ΟίΟβΊΊΛ Ο’ΓΟΗΗΝσιΝ'ίΐΊΓ '' Γ '(00ι0010 (θ (0> Η (rim ^ idLnThree ^ mri rn cn ω ’η η Η Caliber inches οοοοοόοοοοοο oinooinooinnr-in οηΜίηοωιη ^ οττο) inminujminnnddH ιη ω ν η Name cylinders. stool and WdMMddNNddM Ο Uj fci b U. th tu to Cu tu Cu Passage C. odnn ^ uiuirOmo H

continuation

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χΛ · continued

continuation

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and continuation

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* · * #

Maximum production of returnable tandem stool 339.87 t / h

Rolling starts at pass number 4 * TFl *

....... Tandem passes begin at number 1 * TFl *

Distance between Cfce # 1 and stool 10.7 m (35 feet)

Distance between stool and Cfce # 2: 10.7 m (35 feet)

Roller Furnace Diameter 1371.6 mm (54.0 inches)

Rolling furnace temperature 898.89 ° C (1650 ° F)

Acceleration / Deceleration 1 .-. 27 m / s ²

Final forehead temperature to. TS 974.14 ° C * 1736.86 ° F

TS end temperature at 962.79 ° C (1765-, 03 ° F)

Example v

A low carbon steel sheet is produced in which the T52'4Tnm (60 inches) wide, 2.54 rt-thick, is cast from a 127 mm thick cast slab with the following rolling program:

coils, (0.100 inches) (5 inches) according to need

Example V (tandem return mill)

27,216 tonnes 1000 PIW

Rolling program for hot rolling 1524 mm (60.0 ') ________________________________ τ .127 mm (5_, 00.0') / _ 2.54 mm (0.100 ')>

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Maximum production of reversible tandem stool Rolling starts at pass number Distance between Cfce # 1 and stool

Distance between stool and Cfce # 2:

Roller furnace diameter

Rolling furnace temperature

Acceleration / Deceleration

Final body temperature on TS

424.09 t / h * TF1 *

2. _m ------------- (27.00 feet) 8.2 m (27.00 feet) 1371.6 mm (54.0 inches) 954.44 ° C (1750 feet) 00 ° F) 1.27 m / s ² 1677.17 913.98 C ° F • in

Examples IV and v illustrate the range of types that can be made by the present invention and thus provide a wide range of products required for lines to be marketed.

A medium width slab casting machine and an intermediate hot strip rolling mill according to the third embodiment are shown in Figures 3A and 3B. The third embodiment is similar to the first two embodiments, including electric melting furnaces 226 disposed in the inlet portion of the rolling mill 225. ladle furnace 228, casting machine 230, mold 232, and scissors 234 positioned at the exit of mold 232 for cutting a solidified metal strip into slabs of thickness 88.9 to 152.4 mm (3.5 to 6 inches) (average thickness) to the desired length. Which also have a width of 609.6 to 3048 mm (24 to 120 inches).

The brother then. further served on transporter 236 to the area.

removal of slabs, where it is directly loaded into the furnace 242, or is placed in the slabs hopper 280 at ______, or optionally taken from line production and stored in the collection area 240. If it is behind. For example, for the purpose of storing cast slab prior to rolling, for example due to maintenance work on the rolling stand, it is preferable to place slabs in the container 280. The collecting area is generally utilized when additional slab processing is required, such as by hand scaling. The bulk plate 244 and the split plate 246 for certain plate-like products are shown in the step furnace 242. The slabs 238 located in the collection zone 240. can also be fed to the step furnace 242 by shifters 248 or feed arms for indirect feeding of slabs into the step furnace. 242. It is also possible to load the slab furnace 242 from the container 280, which is fed to the transporter 236. As noted above, when taken from outside the line, the furnace must have the capacity to heat the slabs to the rolling temperature. The cartridge 280 will minimize the need for such slab insertion from off-line sites.

The different slabs pass through the following furnace 242. The third embodiment operates essentially the same as the first two embodiments mentioned above. The third embodiment includes extractors 250 feed and return conveyor 252, descaling device 253, vertical planer 254, a hot rolling mill 256 for hot rolling downstream of the feed and return conveyor 252, upstream and downstream of the coiling furnace 258, 260, cooling station 262, winding machine. 266 behind the cooling station 262, coil trolley 267, table 264, scissors 268, conveyor 270, and a finished production line 271 that includes side edge trimming shears 272, end trimming shears 274 and stacker 276 ^.;

Giant. 3B shows a modified version of an embodiment of a casting machine and an inline rolling mill shown in FIG. 3A. Giant. 3A is identical to FIG. 3B, except that a stack of cartridges 280 is disposed adjacent the transporter 236,

I 280 *. Obviously, the second hopper 280 ¹ provides additional capacity to deposit cast slabs in case of delay in the downstream part of the line. However, the addition of the second or more containers 280 ¹ also provides additional shifting options. This allows for some preferences and reordering of slabs so that they are directed to respective containers 280, 280 ¹ from which slabs can be selectively removed.

Giant. 4 illustrates a first embodiment of the container 280. The container 280 comprises a car 282 mounted by disks 284 in a wheel 54, 286, which is arranged in a pit 288 for a slab.

______ The walls_290 are suitably insulated as well as the top surface

292 of the car 282 which supports the bottom slab from the slab column. The insulated movable lid 294 serves to cover the stowage pit 288 and the slab column as shown in FIG. 4. The shunters 296 serve to move the slabs to and from the column in the cartridge 280. The cartridge 280 operates as follows: the upper surface 292 of the car 282 by means of the pusher 296. the car 282 is then moved down a distance substantially equal to the slab thickness, whereby the second plate can be pushed by the pusher 296 directly onto the top of the original

-bramy. When 'was ~ 280 to the reservoir "placed ň3lóúpec ^- bram7'může' be on top of the slab holding pit 288 arranged so that the lid 294 is retained in slabs, heat.

Configuration, stack .280. za.j iš.tu j.e simple? and an efficient slab stacking means, which also minimizes space requirements. Further, placing the slabs in a column, one on top of the other, and keeping the slabs so placed in direct contact, provides the advantageous thermal conditions common to slabs of greater thickness. The temperature losses of individual slabs are minimized by this column arrangement.

Fig. 5 is a side view of another exemplary embodiment of cartridge 280 ¹ according to the invention. Container 280 * includes a car 282 ¹ supported on a frame 298. The car 282 ¹ is vertically movable to z

The car 282 ¹ includes a front and a rear pair of gripper arms 300. As shown in FIG. 6, the gripping points 302 of each gripper arm engage the walls of the bottom plate in the slab column to engage and support the slab column. Preferably, the gripping arms are hydraulically actuated to be moved into and out of engagement with the slabs. In addition to being moved into and out of engagement with the slabs, the gripper arms 300 may preferably be moved to accommodate different slab widths. A side insulating plate 304 and an upper insulating plate 306 are attached to each retaining arm 300. As shown in FIG. 6, the upper insulating plates 306 of the opposite retaining arms 300 overlap each other to allow the retaining arms 300 to move to accommodate different widths. bram.

The cartridge 280 ¹ operates in a similar manner to the above cartridge 280 and provides similar advantages. In operation, the car 282 &apos; is lowered above the slab and the gripper arms 300 are actuated, securely gripping the slab, and the car 282, in which the slab is trapped, is lifted again. To add a second slab to the slab column, the wagon 282 ^{1 is} lowered, placing the slab on top of the second slab to be added to the column. The gripper arms 300 release the first slab, the car is lowered to adjust the engagement points 302 with the new lowest bottom slab in the column, and the gripper arms 300 catch the new bottom slab in the slab column. This process is repeated until all slabs are arranged in a column and the process is reversed to remove slabs from the column.

As mentioned above, the advantage of cartridge 280 ¹ is the need for small space and efficient, efficient heat conservation, as was the case with cartridge 280 described above. In addition, cartridge 280 ¹ creates a system that can be mounted directly above the conveyor table thereby it further minimizes the required floor space required for the entire system.

Although the present invention has been described in detail with respect to certain preferred embodiments, other variations are possible. Therefore, the spirit and scope of the claims should not be limited to the description of the preferred embodiments herein.

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Claims (6)

PATENTOVÉ 1. A casting machine for casting a hot-rolled mill for hot-rolled plates comprising: a) machine for continuous casting of medium thickness belt, b) scissors inserted downstream of said casting machine for cutting said strip into slabs of the desired length; c) means for selective storage and sequencing of selected slabs, d) at least one heating furnace arranged downstream of said slab receiving and shifting means, e) a feed and return conveyor arranged at the outlet end of said heating furnace; (f) a hot-rolled reversing mill coupled to said feed and return conveyor to weaken the slab exiting the heating furnace to an intermediate product having a thickness sufficient for coiling; and g) a pair of coiling ovens, one of which is arranged upstream of said reversible rolling mill for rolling 2a, and second thereafter, said coiling furnaces being adapted to receive and dispense said intermediates as administered between coiling furnaces and through said hot rolling return stands to attenuate to the thickness of the resulting product. thickness .alpha. The apparatus of claim 1, further comprising a conveyor bench coupled to said shears, said means for storing and shifting slabs comprising: means for transporting slabs adjacent to said conveying means ·Ί · Τ * ^- - a bench extending transversely to said conveyor and communicating with said feed and return conveyor, a collection and storage area adjacent to said slab conveyor means and adapted to selectively receive slabs from said conveyor means. The apparatus of claim 2, further comprising a pair of said heating furnaces, wherein said first heating furnace is arranged between said feed and return conveyor and said conveyor bench, and the second heating -pec is arranged with said first heating-furnace and adjacent thereto, having an inlet opening in line with said transport bench and an outlet opening in line s., conveyor and return conveyor. The apparatus of claim 1, wherein said feed and return conveyor is interlocked relative to the scissors and adapted to receive slabs directly from said scissors, said means for shifting and storing said slabs comprising: a slab conveyor adjacent to said scissors; _f podá- to said return conveyor to the clamping and extending transversely thereto, for selectively removing the slabs from said feed and return conveyor, conveyor table adjacent to said conveyor and adapted to receive slabs from said slab transfer conveyor, and the collection and storage area, which is adjacent to the above At Τ * '* 58 a bench extending transversely to said conveyor and communicating with said feed and return conveyor, a collection and storage area adjacent to said slab conveyor means and adapted to selectively receive slabs therefrom. The apparatus of claim 2, further comprising a pair of said heating furnaces, wherein said first heating furnace is arranged between said feed and return conveyor and said conveyor bench, and the second heating furnace is arranged downstream of said first heating furnace and adjacent thereto. to it, having an inlet opening in line with said conveyor bench and an outlet opening in line with said feed and return conveyor. 4. The apparatus of claim 1, wherein said feed and return conveyor is in-line relative to the scissors and adapted to receive slabs directly from said scissors, said means for shifting and storing said slabs comprising: a slab conveyor adjacent to said feed and return conveyor extending transversely thereto for selectively removing slabs from said feed and return conveyor, a transport bench adjacent to said conveyor and adapted to receive slabs from said slab conveyor, and a collection and a storage area adjacent to said conveyor bench and adapted to selectively receive slabs from said conveyor bench. The apparatus of claim 1, further comprising a conveyor bench arranged in line with said scissors, said slab receiving and shifting means comprising at least one column magazine arranged adjacent to said conveyor bench, said magazine comprising a vertically movable car for supporting a column of said slabs. 6- Process zpracovávání..kovových .bram., _ _T comprising the steps of: a) continuous casting of medium thickness strip, b) shearing said strip to a slab of predetermined length, (c) selective administration of each of these slabs either (i) a continuous production line comprising a hot-rolled return mill, upstream and downstream of which is a coiling furnace; or (ii) an intermediate heating furnace from which said slab exits to said continuous production line; (iii) a storage area for slabs and subsequent transfer * of said slab to said in-line heating furnace, d) flat calibration of the slab passing back and forth through said rolling stand to form an intermediate product of a thickness sufficiently small for coiling, (e) coiling said intermediate in one of said coiling furnaces; (f) passing said coiled intermediate back and forth through i 'i> and? w 0 | > US 7ΊΛO Η 3Λ 0 '3 AiAJ QHd avyo 5. lil> Γ 01 $ 0Q:: γ b t O, 'f ‘3 AL ' _{lbd jAL3} l, NlSV ⁿ u \ ϊ 0Η3Λ0 '1 qv ^ i o 5 Mar 7 L jl $ OQ V). .1 b ΐ 0 I, ·, Λ V ^- • over jAIDINISVIA, _{0Η 3Λη} · sxwgyd of ova ΠΙ Ί L Ol ^ oa 'i. 6 5 0 t □ f JM31 1S 71Λ OH ^ Up 3 XiN Qda avy o niad 6 III? 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