BRPI1002945A2 - apparatus for maintaining temperature and / or possibly heating for long metal products and related method - Google Patents

Abstract

APPARATUS FOR MAINTENANCE OF TEMPERATURE AND / OR POSSIBLE HEATING FOR LONG METAL PRODUCTS AND RELATED METHOD6. Apparatus for maintaining temperature and / or possible heating for long products continuously melted and cut to size by means of cutting (15) in order to define segments of ingots, said apparatus being disposed between a casting unit (11) having a first casting line (12) and a second casting line (13) and a rolling line (30) arranged downstream of the casting unit (11) in order to produce long-rolled metal products. The apparatus comprises: a section of movable movement (20) of said segments of ingot arranged downstream of said cutting means (15) and comprising a first movable line (20) and a second movable line (21), said first ( 20) and second (21) movable lines being suitable to move transversely to the forward direction of the ingot segments so as to move to a first position in which said movable line (20) and / or said second movable line ( 21) are aligned, respectively, with the first casting line (12) and the second casting line (13) and to a second position in which one of said first movable line (20) or said second movable line (21) it is aligned with a transport axis (23); and an oven (24), arranged downstream of said movable movement section (20), comprising an inlet roller conveyor (25) for the ingot segments aligned with said conveyor shaft (23) and a roller conveyor outlet (27) aligned with said lamination line (30) and transverse transfer devices (46, 47) suitable for transferring the ingot segments of the input roller conveyor (25) towards the exit roller conveyor ( 26)

Description

Patent Descriptive Report for: "TEMPERATURE AND / OR POSSIBLE HEATING EQUIPMENT FOR LONG METAL PRODUCTS AND RELATED METHOD"

FIELD OF INVENTION

The present invention relates to an apparatus for maintaining temperature and / or possible heating for continuously cast long products and the related method for a continuous casting and rolling unit in semi-continuous mode for making long-rolled metal products such as like bars, rebar, cables, rails or sections in general.

BACKGROUND OF THE INVENTION

State-of-the-art continuous casting steelmakers for the production of long rolled products have considerable limitations because, for reasons intrinsically related to operational constraints and component performance, productivity generally does not exceed 25-40 tonnes / year. hour.

Consequently, in order to achieve higher productivity, it is necessary to increase the number of casting lines connected to the same rolling line, which can be up to 8 lines or more.

This requires, among other things, the need to translocate the ingots or ingots that come out of the various casting lines onto a single heating furnace entry point, with consequent temperature losses during transfers.

As a consequence of this consideration, a considerable amount of energy is required to power the heating furnace, restore the lost temperature and bring it from the input value of 650 ° C to 750 ° C to the appropriate value for rolling, that is, in a range of from 1050 ° C to 1200 ° C.

In addition, the need to transfer the ingots or ingots segments from the various casting lines to the point where they are introduced into the furnace imposes limitations on length and therefore weight: the length of the ingots or ingots is between 12 and 12 inches. 14 meters, to a maximum of 16 meters and the weight is on average 2-3 tons.

These process needs and limitations are the main cause of an increase in the energy required for ingot or billet heating and a worsening of maximum throughput due to the large continuous casting distributors that are required to serve multiple foundry lines and also the large number of ingots or ingots to be processed given the same number of tons / hour to be produced, with consequent high number of cuttings, main entrances to steel mill platforms and non-commercial size sub-lengths.

To overcome this disadvantage, the number of casting lines has been reduced to just two, which has provided a suitable temperature maintenance and / or possible heating apparatus which receives the ingots of the two lines and makes them available to the rolling line. downstream. One purpose of the present invention, therefore, is to design an apparatus for temperature maintenance and / or possible heating for continuously molten long metal products and a related method associated with two casting lines, which allows to manage, in a simple and reliable manner, the molten product segments cut to size.

Another purpose of the present invention is to fully exploit the enthalpy possessed by the original liquid steel along the entire production line and in particular within the temperature maintenance and possible heating apparatus, reducing temperature losses over time between cutting. from the molten product to size and shipment to the rolling step for considerable energy savings and reduction in operating costs compared to conventional processes. Other purposes of the invention are:

- allow shutdowns of the rolling mill and, in particular, rolling mills, without having to interrupt the upstream casting process, thereby obtaining a high steel utilization factor;

- reduce to a minimum or dispose of waste material in emergency situations or during scheduled shutdowns and thus completely recover the product which, in such situations, temporarily accumulates within the temperature maintenance device and / or possible heating, as well as , giving a higher yield equal to the ratio of the weight of the finished product to the weight of the liquid steel;

- bring the performance of a semi-continuous process closer to that of an endless process, ie without continuity solution between the continuous casting unit and the rolling line;

- ensure the possibility of changes in production in size and type, without stopping continuous casting, obtaining a higher utilization factor of the steel mill.

The Applicant has designed, tested and embodied the present invention to overcome the shortcomings of the prior art and to achieve these and other purposes and advantages.

SUMMARY OF THE INVENTION The present invention is presented and characterized by the independent claims, while the dependent claims describe variants of the main idea of the invention.

An apparatus for maintaining temperature and / or possible heating for long metal products according to the present invention is provided in a semi-continuous continuous casting and rolling unit for the production of long rolled products and is disposed between a continuous casting with two casting lines and one downstream rolling line.

Continuously cast metal products are cut to size by cutting means disposed immediately downstream of the casting unit to define ingot segments of a predefined length advantageously from 16 to 60 m, preferably from 30 to 60 m. 40 m.

The rolling line is arranged inclined and parallel to the casting lines.

Each casting line has a respective crystallizer which can melt products in terms of thickness at a variable speed of 3 to 9 m / min.

In the description and claims, the term ingot means a product having a rectangular or square section in which the ratio between the long side and the short side is 1 to 4, that is, between the square section and the rectangular section. where the long side can be up to 4 times longer than the short side.

In the present invention, the section of the melt is not limited, however, as we said, to a rectangular or square section with straight sides and two by two parallels, but also comprises sections with at least one curved, concave or convex side advantageously. but not necessarily two by two opposites and specular or combinations of the aforementioned geometries.

Simply to give an example, the square sections which are produced by each continuous casting line have dimensions ranging from about 100 mm χ 100 mm, 130 mm χ 130 mm, 150 mm χ 150 mm, 160 mm χ 160 mm or intermediate dimensions; In order to increase productivity, rectangular sections having dimensions ranging from 100 mm χ 140 mm, 130 mm χ 180 mm, 130 mm χ 210 mm, 140 mm χ 190 mm, 160 mm χ 210 mm, 160 mm χ 280 mm , 180 mm χ 300 mm, 200 mm χ 320 mm or intermediate dimensions can also be produced. In the case of the production of medium sections, even larger dimensional sections can be used, for example of about 300 mm χ 400 mm and the like.

The temperature maintenance and / or possible heating apparatus according to the present invention is located downstream of the casting unit; said ingot segments, cut to size, enter directly and without intermediate movement and / or are transferred to said apparatus at an average temperature of at least 1000 ° C, preferably from about 1100 ° C to about 1150 ° C. . The average temperature at which the ingot comes out of the apparatus is between about 1050 ° C and 1200 ° C.

According to a feature of the present invention, the temperature maintaining and / or possible heating apparatus comprises a movable moving section and a side transfer furnace, wherein the movable moving section is disposed between the cutting means for size. and the side furnace provides movement to the billet segments which are fused by the two casting lines. The movement section comprises:

a first movable line which, in a first position, is arranged aligned with the first casting in order to receive ingot segments thereof and which, in a second position, is arranged aligned with a transport axis which, in turn, is aligned with a roller inlet in the side oven;

a second movable line which, in a first position, is arranged aligned with the second casting line so as to receive from it the cut billet segments and which, in a second position, is arranged aligned with said one. conveying shaft to discharge the ingots segments into the side furnace.

The respective first and second positions of the lines are independent of each other thus allowing the process of casting the two lines to be independent of each other and preventing any interruption thereof.

The side transfer furnace is arranged downstream of the movable moving section of the ingots and comprises said roller conveyor inlet with an outlet or removal roller conveyor which is parallel and offset relative to the roller conveyor inlet. and aligned with the downstream rolling line and transfer devices for transferring the ingot segments from the roller conveyor inlet to the outlet roller conveyor.

According to a variant of the invention, between the cutting means for the size of the billet segments and the movable motion section, there is also a fixed motion section having a first fixed motion line and a second fixed motion line each. one of which is for conveying respectively the billet segments of the first casting line towards the first movement line and respectively from the second casting line towards the second movable movement line.

In some operating conditions of the steel mill, the movable moving section advantageously allows to receive the ingots segments that arrive from the casting lines during the step when the movable moving section sections are still discharging the ingots segments into the furnace. . This allows for greater continuity and uniformity in the transfer of ingot segments, for example at very high casting speeds.

In another embodiment, the side transfer furnace comprises a storage means or support plane or storage zone for temporarily containing the segments of ingots that are temporarily disposed therein. The storage medium is disposed between the inlet roller conveyor and the furnace outlet roller conveyor.

According to another feature of the invention, the transverse transfer devices comprise displacement means which transfer the ingot segments of the input roller belt towards the storage media containing the ingot and extracting means that extract the ingot segments. ingots of the containment storage media to make them available to the output roller conveyor and thus to make them available to the rolling line.

The oven of the apparatus of the present invention is of a length which may range from at least about 16 to about 60 meters, preferably between 30 and 40 meters.

The storage medium acts as an accumulation reserve for the ingots, for example when an interruption in the rolling process due to accidents has to be overcome or during a scheduled change of rolling equipment or change of production thereby avoiding any material and energy losses and above all avoiding any interruption of the foundry. The device allows for ingots to accumulate for up to 60/80 minutes (at maximum casting speed) and beyond, and is in any case variable during the design of the steel mill.

This allows to considerably improve the utilization factor of the steel mill.

Thanks to the oven's accumulation capacity, overall throughput is also improved for the following reasons:

- the number of foundry startups is reduced or eliminated, with consequent savings in material wasted at the start and end of casting;

- steel which, at the moment of accidental blockage in the rolling unit, for example by virtue of a chipboard, must be supplied from the continuous casting distributors (which discharges the liquid steel in the crystallizer) to the start of the unit. The rolling mill does not have to be scraped off, nor the remaining steel in the foundry pan, which often cannot be recovered;

- In the event of an accidental blocking of the rolling unit, the ingot already attached to one or more platforms can be returned into the oven and kept there, also at temperature, preventing any segmentation and thus any loss of material.

According to one formulation of the present invention, the optimum length of the ingots segments and, consequently, of the furnace which must contain them, is chosen as a function of the reduction to a minimum of the linear combination of furnace heat losses and material losses due to chips, short bars and agglomerates.

The present invention also relates to a method in which the continuous casting step is performed on two casting lines; The molten products are cut to size and transported to an oven after respectively the following steps.

Ingot segments are introduced into a movable motion section having two movable motion lines, each of which is suitable for receiving the ingot segments of the corresponding casting line.

In a subsequent step, once the billet segments are loaded onto the moving line of movement, one of them is moved transversely to the billet feed direction so as to align it with a conveying axis which in turn , is aligned with a side oven inlet roller belt. Then, a furnace loading step follows said inlet roller belt.

A similar step subsequent to or prior to that described above is provided for the other moving line of motion.

In the furnace, the billet segments are translocated transversely to be arranged on a furnace exit roller belt, which allows to feed a feed unit disposed downstream of the apparatus.

According to a characteristic aspect, the furnace is provided with a storage medium between the inlet and outlet roller mats, in which the ingots segments are kept for a time correlated to their size.

BRIEF DESCRIPTION OF DRAWINGS

These and other features of the present invention will become apparent from the following description of a preferred embodiment, provided as a non-restrictive example with reference to the accompanying drawings, in which:

- fig. 1 shows a possible layout of a lamination unit in which the temperature maintenance and / or possible heating apparatus according to the present invention is inserted;

- fig. 2 shows a plan view of the temperature maintenance and / or possible heating apparatus according to the present invention;

- fig. 3 shows a sectional view of fig. 2, from III to III;

- fig. 4 shows a sectional view of fig. 2, from IV to IV;

Figs. 5 and 6 show different operating configurations of FIG. 4;

- fig. 7 shows a sectional view of fig. 2, from VII to VII;

Figs. 8-11 shows examples of some different sections that can be fused with the steel mill in fig. 1.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT

With reference to the accompanying drawings, fig. 1 shows a first example of a layout 14 of a long product steel mill according to the present invention, in which a temperature maintenance and / or possible heating apparatus 10 according to the present invention is inserted.

The layout 14 in fig. 1 comprises, in the essential elements shown, a continuous casting unit 11 comprising two casting lines, respectively, a first casting line 12 and a second casting line 13, which run parallel to each other. which uses a crystallizer or other suitable device for casting ingots with a square or rectangular section and various shapes and sizes, with straight, curved, concave or convex or other sides. Some examples of sections that can be fused with the present invention are shown in figs. 8-11 which respectively show a rectangular section with straight and parallel sides (fig. 8), a section with short sides with a convex curvature and long straight and parallel sides (fig. 9), a section with short sides having a convex curvature in the center and with long straight and parallel sides (fig. 10) and a section with short sides with a convex curvature and long straight and parallel sides (fig.11).

It is quite evident that the same considerations can also be made for square section ingots.

Advantageously, in the case of rectangular sections, the layout 10 of this casting and rolling unit allows to obtain ingots with a high metric weight, given the same section height or section thickness.

In this way a discontinuous or semi-continuous process is obtained, but with a yield which, thanks to the sizing of the apparatus parameters 10, is very close to the yield of a process without interruption in continuity or endless mode.

The first 12 and second 13 casting lines (fig. 1) are arranged on sloping lines, but parallel to each other and with respect to a single downstream rolling line 30, they melt two ingots in parallel, preferably with one another. same section, square or rectangular, and both feed into a downstream lamination unit 31.

Downstream of the first 12 and second 13 casting lines, there is a cutting means of size 15, for example, as cutters or an oxidizing cutting torch, which cuts the cast ingots into segments of a desired length, hereinafter referred to as Ingot segments. Advantageously, the ingots are cut into segments of a length of 1 to 5 times longer than the state of the art, and according to the present invention the length is from 16 to 80 meters or more, preferably from 30 to 60 meters. Thus, higher weight ingots are obtained, 5 to 15 times higher than in the state of the art which, according to the present invention, is between 10 and 50 tons.

Thus, while the different layouts are configured to operate in semi-continuous mode because it starts from size-cut segments, the long-length, high-weight ingot segments allow, during normal operating conditions, to operate in a condition of substantial continuity, achieving performance very close to that of worm mode.

The apparatus 10 (figs. 1 and 2) is installed downstream of the continuous casting unit 11 and immediately after the cutting medium to size 15 and comprises a possible fixed moving section 18, a movable moving section 19 and an oven temperature maintenance and / or possible side heating 24.

The fixed motion section 18 comprises a first fixed motion line 16 (hereinafter referred to as the first fixed line) for receiving the billet segments cast by the first casting line 12 and a second fixed motion line 17 (hereinafter referred to as the second fixed line). to receive the billet segments cast by the second casting line 13. In particular (Fig. 3), the first fixed line 16 and the second fixed line 17 are aligned with the first 12 and second 13 respectively. and each comprises a roller belt comprising suitably motorized feed rollers 36 which feed the ingot segments which are mounted within a perimeter enclosed transit tunnel 35 and suitably insulated to reduce the temperature losses of the castings. Ingot segments. Simply to give an example, the ingot segments that enter the fixed motion section have a temperature of about 1100 ° C to 1150 ° C.

The main function of the fixed moving section 18 is to temporarily contain the ingot segments cut by the cutting means 15 when the moving moving section, under certain operating conditions, is not yet fully aligned with that fixed 18.

The movable moving section 19 (fig. 1), in turn, comprises a first movable moving line 20 (hereinafter referred to as the first movable line) for receiving the first fixed line ingot segments 16 and a second moving line. 21 (hereinafter referred to as the second movable line) for receiving the ingot segments of the second fixed line 17. In particular (fig. 2 and figs. 4-6), the first 20 and the second movable lines each comprise: a plurality of motorized movement slides 37 which slide along rails 39 arranged transversely to the feed direction of the ingot segments.

The movement slides 37, in their essential components, comprise extraction rollers 40, each of which is driven by drive elements 41 and a conveyor tunnel 43 is suitably closed and insulated to limit the temperature losses of the ingot segments. . The temperature losses must in any case be contained so that the ingot segments in the movable motion section 19 are maintained at an average temperature of between 1090 and 1140 ° C.

The first and second movable lines 21 are suitable for conveying to the side furnace 24 the ingot segments loaded thereon. In particular, in the condition where they receive the ingots (fig. 4), the two moving lines 20, 21 are perfectly aligned, respectively, with the first 16 and second 17 fixed lines whereas, when the ingot segments are transported to the furnace 24, they move transversely and independently of each other until the ingot segments loaded thereon are aligned with a conveyor shaft 23 which, in turn, is aligned with an input roller belt 25 for the ingot segments in the oven 24.

The conveyor shaft 23 is in an intermediate position with respect to the first 20 and second 21 moving lines, so that the latter may align with it at the appropriate time for loading the oven 24.

More specifically, fig. 5 shows a condition in which the first movable line 20 is in position to receive the ingot segments of the first casting line 12, while the movement slides 37 of the second movable line 21 are traversed in the condition for unloading the ingot segments. .

Similarly, fig. 6 shows a condition in which the movement slides 37 of the first movable line 20 are offset transversely in the position for unloading the ingot segments, while the second movable line 21 is in a condition for receiving the ingot segments of the second casting line 13. .

The independent movement of the movement slides 37 advantageously makes the two casting lines 12, 13 independent of each other and, consequently, also the methods for conveying the ingot segments within the furnace 24. As we have said, the main function of the section The fixed-moving position 18 is therefore to allow the advancement of an ingot segment arriving from a casting line 12 or 13, even when one of the moving lines 20 or 21 is in an unloading condition and, consequently, in a position which not suitable for receiving ingot segments arriving from the foundry.

It is clear, however, that, according to other embodiments, by combining the feed rates of the ingot segments along the moving lines and the speeds at which the ingot segments are conveyed to the furnace 24, it is possible to avoid section insertion. fixed motion 18 by loading the ingot segments arriving from the casting lines directly onto the moving lines 20, 21.

The input roller conveyor 25 carries the billet segments within the furnace 24 (fig. 7) and transverse displacement devices 46 serve to move the input roller conveyor segments 25 to a storage or 26 storage medium. containment, so as to make them available at the appropriate time to the rolling line 30 disposed downstream of the oven 24.

The storage medium has an indicative holding capacity of about eighteen ingot segments, which varies with cross-sectional sizes and has six positions for segment height. Simply as an example, furnace 24 is capable of processing a product amount of about 145 tons / hour.

The positioning of the ingots segments within the storage medium 26 depends on the particular operating condition of the steelmaker. If the storage medium 26 is free, the ingots segments are positioned at the end zone thereof, adjacent to the respective exit roller belt 27 while, if there are other ingots segments already present on the storage medium 26 or if the The rolling mill has a lower productivity than that of the foundry or if the rolling line 22 is stopped for some reason, then the new incoming billet segments are placed in a row after those already accumulated and subsequently all the billets. The stored items are pushed together by said means of travel towards the exit position. In another embodiment, the movement of the ingots placed on the storage medium could be obtained, instead of the displacement means mentioned above, with a plurality of movable stringers, which are provided with movement mechanisms.

Extraction devices 47 are for selectively extracting the ingots segments from storage medium 26 so as to load them onto an exit roller belt 27 from furnace 24, which is aligned with the rolling line at 30 ° C. downstream.

The input roller belt 25 and the output roller belt 27 are each provided with a plurality of motorized feed rollers 49, respectively 50, arranged equidistant from each other over the entire length of the furnace. 24 and driven by drive elements arranged outside the oven 24.

The temperature of the ingot segments leaving furnace 24 is from 1100 ° C to 1150 ° C, advantageously 1130 ° C.

The lamination line 30 is provided with another cutting means 33 of a known type arranged upstream of the lamination unit 31.

The furnace 24 not only creates the lateral connection between the two casting lines 12 and 13 and the rolling line 22, but also has the following functions and works in the following modes:

- It acts as a chamber just to keep the ingots segments at temperature. In this configuration, the chamber ensures that the temperature is maintained between the inlet and outlet;

- It acts as a heating furnace for the ingot segments, raising the temperature of the charge between the inlet and outlet;

It also functions as a reserve to compensate for the different productivity between the downstream casting unit 11 and downstream rolling unit 31.

In addition, if the lamination unit 31 is disrupted due to accidents or due to a scheduled roll change or production change, the transfer displacement devices 46 continue to accumulate within the storage medium 26. , the billet segments arriving from the two casting lines 12 and 13, while the extraction devices 47 remain stationary.

Storage medium 26 enables production changes to be made, offering the possibility of up to 60/80 minute storage time without the need to stop or slow down the continuous casting unit 11.

Likewise, it is possible, by virtue of the need to reduce productivity, to make only one casting line work, and thus only a moving line 20 or 21, without the need to stop the entire steel mill.

The optimum length of the ingot segments cast by each casting line 12 and 13 and, consequently, the optimum length of the furnace 14 that will have to contain the ingots segments, is chosen according to the reduction of the linear loss combination to the minimum. inside and material losses due to chips, short bars and agglomerates that occur along the rolling line 30.

Since the optimum length of the ingot segment is calculated as a function of the consumption parameters of oven 24, which are directly related to its length, it is also valid to determine the optimal length of oven 24. In fact, oven 24 will have a optimum length at least equal to that of the ingots segments, except that, advantageously, a safety margin is provided which takes into account possible segments of ingots cut out of tolerance and also the necessary dimensional and constructional adaptations.

In this way, optimal operating conditions for the coordination of casting unit 11 and continuous rolling unit 31 are identified.

Another parameter of particular relevance is the marked reduction in the consumption of natural gas or other fuel to feed the furnace 24, which is up to 50% smaller compared to traditional solutions.

The layout 14 (fig. 1) may in any case serve for other devices such as, for example, units to reduce the section of the laminate immediately upstream or downstream of the maintenance apparatus 10 or heating inductors to cause ingots temperature to values suitable for rolling.

Claims (12)

1. Apparatus for maintaining temperature and / or possible heating for long products continuously cast and cut to size by cutting means (15) to define segments of ingots, said apparatus being disposed between a casting unit (11) having a first casting line (12) and a second casting line (13) and a rolling line (30) arranged downstream of the casting unit (11) to produce long rolled metal products, characterized in that comprising: - a movable moving section (20) of said ingot segments disposed downstream of said cutting means (15) and comprising a first movable line (20) and a second movable line (21), said first (20) ) and second (21) movable lines being suitable for moving transversely to the advancing direction of the ingot segments to move them to a first position in which said movable line (20) and / or said second moving line (21) are aligned, respectively, with the first casting line (12) and with the second casting line (13) and to a second position in which one of said first moving line (20) or said second moving line (21) is aligned with a transport axis (23); - an oven (24) disposed downstream of said movable moving section (20) comprising an inlet roller belt (25) for ingot segments aligned with said conveyor shaft (23) and an outlet roller belt (27) aligned with said rolling line (30) and transverse transfer devices (46, 47) suitable for transferring the inlet roller conveyor segments (25) toward the outlet roller conveyor (26) . Apparatus according to claim 1, characterized in that it also comprises a fixed moving section (18) disposed between said cutting means (15) and said movable moving section (19), comprising a first fixed line (16) aligned with said first casting line (12) towards said first movable line (20) and a second fixed line (17) aligned with said second casting line (13) and suitable for moving the ingot segments fused by the second casting line (13) towards said second moving line (21). Apparatus according to claim 1 or 2, characterized in that said first moving line (20) and said second moving line (21) each comprise movement means (37) sliding on elements guide (39) arranged transversely to the advancing direction of the ingot segments. Apparatus according to any one of the preceding claims, characterized in that said oven (24) comprises a storage means (26) disposed between the inlet roller belt (25) and the outlet roller belt. (27) for temporarily containing ingot segments from said first casting line (12) and said second casting line (13). Apparatus according to claim 4, characterized in that said furnace transverse transfer devices (24) comprise displacement devices (46) suitable for transferring the ingot segments of said inlet roller belt ( 25) toward said storage means (26) and extraction devices (47) suitable for selectively extracting said storage means (26) from said ingot segments so as to discharge it onto said conveyor belt. output rollers (27). 6. Method for maintaining the temperature and / or possible heating of long molten products continuously cast by a continuous casting unit (11) having a first casting line (12) and a second casting line (13), cut to size by cutting means (15) for defining ingot segments and subsequently rolled by a rolling line (30) arranged downstream of a temperature maintenance and / or possible heating of the ingot segments, characterized in that it comprises : - a first step of introducing the billet segments into a movable moving section (19) provided with a first movable line (20) and a second movable line (21), which comprises a first segment introducing sub-step. ingot castings by said first casting line (12) on said first movable line (20), which is arranged aligned with said first casting line (12); and a second sub-step for introducing the ingot segments cast by said second casting line (13) into said second movable line (21), which is arranged aligned with said second casting line (13); - a second loading step of the ingot segments in a furnace (24) which confers a transverse displacement of the first movable line (20) or second movable line (21) so as to selectively align them with a conveyor axis ( 23) and subsequently unloading the ingot segments on an inlet roller belt (25) of the furnace (24), which is aligned with said conveyor shaft (23); and - a third lateral transfer step of the billet segments within the furnace (24) from said inlet roller conveyor (25) to an furnace outlet roller conveyor (27) which is aligned said lamination line (31) by means of transverse transfer devices (46, 47). Method according to claim 6, characterized in that, prior to said first step, it is provided to insert said ingot segments into a fixed moving section (18) having an aligned first fixed line (16) with said first casting line (12) and a second fixed line (17) aligned with said second casting line (13), said ingot segments being transferred from said first fixed line (16) to said first line (20) and respectively from said second fixed line (17) to said second mobile line (21). Method according to claim 6 or 7, characterized in that said third lateral transfer step comprises a first sub-step of displacing said ingot segments transversely of said inlet roller belt (25) to a storage medium (26) and a second selective sub-step of said ingot segments of said storage medium (26) for discharging them onto said output roller belt (27) and making them available to the said lamination line (30). Method according to any one of claims 6 to 8, characterized in that the ingot segments are introduced into said furnace (24) with an average temperature of between 1060 ° C and 1110 ° C. Method according to any one of claims 6 to 9, characterized in that said outlet temperature of said furnace (24) is between 1050 ° C and 1200 ° C. Method according to any one of claims 6 to 10, characterized in that the ingot segments have an overall length of between 16 and 60 m. Method according to claim 11, characterized in that the ingot segments have an overall length of between 30 and 40 m.