JP2013501144A - Apparatus and method for producing microalloy steel, in particular tube steel - Google Patents

Abstract

The present invention is a method for producing microalloy steel, in particular pipe steel, in which a cast slab (1) is cast in the following order in the conveying direction (F) of the slab (1) ( 3) Equipment having a first furnace (4), at least one rough rolling stand (5), a second furnace (6), at least one finishing rolling stand (7) and a cooling section (8) The present invention relates to a manufacturing method that passes through. In accordance with the present invention, it is proposed to have the following steps.
a) Define the desired temperature profile of the slab (1) while the slab travels through the facility (2).
b) at least one temperature-influencing factor (9, 10) for optimizing the temperature of the slab (1) according to the defined temperature profile in the production line (L) of the installation (2) Positioning, the elements (9, 10) affecting the temperature between the first furnace (4) and the at least one roughing stand (5) and / or the second furnace (6 ) And at least one finishing rolling stand (7).
c) Production of the slab (1) or strip in the equipment (2) thus configured, with at least one temperature being maintained so that the defined temperature profile is at least largely maintained. Activate the influencing element (9, 10).

Description

  The present invention relates to a method for producing microalloy steel, in particular pipe steel. In this case, the slab to be cast has a casting machine, a first furnace, at least one rough rolling stand, a second furnace, at least one finishing rolling stand and a cooling section in this order in the conveying direction of the slab. Go through the facilities. The present invention further relates to equipment for producing microalloy steel.

  For the production of strips, various possibilities according to a similar type of method are described in the prior art literature. For example, this is shown in US Pat.

  Thermomechanical rolling is an established method. Microalloy steel has gained important significance in recent years. In doing so, pipe steel (according to API specification 5L) is one of the most important subgroups of microalloy steel. The demand for this steel is increasing.

  Most of the pipe steel is produced by a thick metal plate rolling mill. Of course, tube steels, in particular those having a final thickness and final width that are not too large, can also be produced in hot wide strip mills, so-called CSP equipment and other rolling equipment.

  During normal production of microalloy steels and during special production of tube steel, the temperature profile as a function of time (or as a function of location within the finishing equipment) is particularly noticeable. This transition, combined with the reduced distribution, has a decisive influence on the development of the microstructure and thus determines the mechanical and technical properties of the steel. For this reason, for example, a cooling device with high output is used behind the finishing section. The desired temperature transition can then be adjusted by this cooling device.

  Known finishing equipment and methods are flexible in meeting the various preconditions and requirements for finishing microalloy steels, in particular pipe steels. It is disadvantageous that it is not optimal for finishing with a profile or temperature profile for the transport path. Thus, it is not possible at best to manage and influence the structure development in steel. The flexible production of the above steels with respect to their chemical composition and dimensions is thus limited.

US Patent Application No. 2005/0115649 A1 International Publication No. 2009/012963 A1 Specification International Publication No. 2007/073841 A1 Specification International Publication No. 2009/027045 A1 Specification European Patent No. 0 611 610 B1 European Patent Application No. 1 860 204 A1

  The object of the present invention is therefore to provide a method and associated apparatus that can overcome the above disadvantages. Therefore, improved control of the temperature transition should be possible according to the desired profile for time and transport path, so that tissue development can be better managed and controlled. In addition, this allows for a more flexible finish of microalloy steel, in particular tube steel.

This problem is solved according to the invention by the following sequence of steps according to the method.
a) Define the desired temperature profile for the slab while traveling through the facility.
b) positioning at least one temperature-affecting element in the equipment production line for the optimization of the temperature of the slab according to the defined temperature profile, the element affecting the temperature being the first Between the second furnace and at least one rough rolling stand and / or between the second furnace and at least one finishing rolling stand.
c) The slab or strip is manufactured in the equipment so configured, with at least one element affecting the temperature being operated so that the defined temperature profile is at least largely maintained.

  At that time, another furnace is used as an element affecting the temperature according to the configuration of the present invention. This can be an induction furnace or a furnace that heats the slab by direct flame energization (DFI oxyfuel furnace). In the latter case, the direct flame activation of the slab is preferably effected by a gas injection having at least 75% oxygen, in which gaseous or fluid fuel is intended to be mixed. ing. As another furnace, a compensation furnace, a roller hearth furnace, or a walking beam furnace or a pusher furnace can be used.

  A separate cooling zone can be used as a factor affecting the temperature. This can be, for example, a centralized cooling zone or a laminar strip cooling zone.

  Finally, a temperature blocking element can be used (roller table capsule) as a factor affecting the temperature.

  In so doing, the temperature profile is preferably determined on the basis of a tissue model. The texture model preferably then determines and / or monitors the following parameters: temperature profile with respect to time or number of passes, decreasing distribution with respect to time or number of passes, holding time or round trip time, rolling speed and conveying speed. And / or cooling strength and cooling strength.

One refinement achieves a very low entry temperature into at least one finishing mill by using factors that affect the temperature of the type of cooling device, where there is little recrystallization and crystal growth. The temperature level between entry into the at least one rough rolling stand and entry into the element affecting the temperature of the cooling device type is not
a) Especially for tube steels with a low microalloy content and a thin slab thickness, it is lowered by factors that affect the temperature of the type of cooling device, and crystals on entry into the finishing rolling section The size is reduced or
b) Especially for tube steels with high microalloy element content and thick slab thickness, enhanced by factors that affect the temperature of the type of heating device, complete recrystallization during rough rolling Is guaranteed or
c) simply compared and otherwise left unchanged.

According to one refinement and further by using elements that affect the temperature of the type of heating device, a very high entry temperature to at least one finishing rolling stand is achieved, so that recrystallization takes place completely there. Or proceed to
a) based on high temperature and decrease, already done in the first finishing pass, and further accumulation of deformation continues in the last finishing pass, or
b) Based on the gradual temperature and decrease, it is finally done in the last finishing pass after the previous accumulation of deformation.

  Equipment for the production of microalloy steel, in particular pipe steel, in the conveying direction of the slab, casting machine, first furnace, at least one rough rolling stand, second furnace, at least one finishing rolling stand And a facility having cooling sections in this order, according to the invention, between the first furnace and at least one rough rolling stand and / or between the second furnace and at least one finishing rolling stand. The factors affecting the temperature for the optimization of the temperature can be selectively brought into the production line, the factors affecting the temperature being different furnaces, different cooling zones, temperatures It can be selected from the following elements:

  The element affecting the temperature of at least one of the separate furnace, the separate cooling section and the temperature shut-off element is provided slidable transversely with respect to the conveying direction of the slab, so that one of the elements is selectively It can be brought into the production line.

  At least one element of another furnace, another cooling section, and a temperature shut-off element can be provided so as to be swingable about a rotation axis facing the conveying direction. One can be selectively introduced into the production line.

  Improved production of microalloy steels, in particular tube steels (eg X52... X120), is possible with the proposed solution, which leads to a good combination of properties. The best values of stiffness and viscosity, as well as the maximum flexibility with regard to the chemical composition used, as well as the dimensions of the final product, are achieved by the intended control of the temperature transition. The limitations that exist so far based on general process management are largely removed by the proposal according to the present invention. In a very advantageous way, the desired temperature and time transitions during the production of the steel are achieved, so that the pipe steel can be produced with a high quality.

  According to the proposed method, the temperature can be raised and kept constant or lowered before and during the pre-interval and between the pre-interval and the finishing interval. Thus, with regard to temperature control, maximum flexibility is achieved, which not only opens up the basic possibilities of tube steel production, but also allows for various productions of this steel type depending on demand. Allows adjustment of the method and different material properties.

  Furthermore, many other steel types in which the temperature transition plays an important role can obviously be produced without problems and, in certain cases, with better properties, For example, it applies to other phase steels and all types of microalloy steels.

  Eventually, the reduced distribution changed by the changed temperature transition is applied, and in particular, higher reductions can be performed. This also results in a thinner achievable final thickness in all steel types or additional free space in the equipment design.

  The use of an effective heating device (inductive heating device or DFI oxy-fuel furnace) and / or adjustable central cooling device (for example at the reciprocating point of the pre-strip in contact with air) Increases the overall productivity of the equipment or this simplifies the manufacturing sequence.

  Therefore, the proposed method or apparatus makes it possible to accurately influence the temperature of the slab before rough rolling, depending on the material analysis, material dimensions and material properties. Similarly, depending on the material analysis, material dimensions and material properties, it is possible to accurately influence the temperature of the pre-strip before finish rolling.

The precise control of the temperature control during the individual process steps is preferably done by using or utilizing a tissue model. In doing so, the organizational model (as already described) determines the transition of the following parameters and monitors them.
・ Temperature profile with respect to time or number of passes ・ Decreasing distribution with respect to time or number of passes ・ Holding time or reciprocation time ・ Rolling speed and conveying speed to influence temperature profile ・ Heating strength and cooling strength

  In addition, various types of precise control of the softening process during the process steps and the accompanying control of the material properties can be performed.

  The method can be used for various thermomechanical processes.

  The incorporation of the slab cooling device can be done in the roughing stand before the pre-deformation of the slab. Similarly, the incorporation of induction heating devices or DFI oxyfuel heating devices can be done before pre-deformation in the roughing stand.

  The various cooling and heating units can be exchanged with each other by sliding or swinging.

  The maximum achievable reduction effects and pre-reduction distribution effects are effective for product dimensions and properties, and for equipment design, due to precise temperature increases prior to rough and finish rolling. Is possible.

  This increases the productivity of the rolling equipment by precise (additional) cooling and / or heating.

  In the drawings, embodiments of the invention are described.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a simplified side view of a casting and rolling facility according to a first embodiment of the present invention having a casting machine, a first furnace, a pre-section, a second furnace, a finishing section, and a cooling section. Fig. 3 shows a casting and rolling facility according to the second embodiment, which is an alternative to Fig. 1; FIG. 4 shows a casting and rolling facility according to the third embodiment, which is further alternative to FIG. The form of the casting and rolling equipment according to the fourth embodiment, which is further alternative to FIG. The form of the casting and rolling equipment according to the fifth embodiment, which is further alternative to FIG. The form of the casting and rolling equipment according to the sixth embodiment, which is further alternative to FIG. The simplified top view of the casting and rolling equipment according to another embodiment. The figure which looked at the element which affects the temperature expressed simply in the casting rolling equipment in the conveyance direction of a slab. According to a first embodiment of the invention. FIG. 9 is a diagram representing, in accordance with the second embodiment of the present invention, a form of an element that affects temperature, which is further alternative to FIG. FIG. 9 represents according to a third embodiment of the invention the form of the element affecting the temperature, which is further alternative to FIG. FIG. 9 is a diagram representing, in accordance with the fourth embodiment of the present invention, elements that affect the temperature further alternative to FIG.

  FIG. 1 shows a side view of equipment 2 for casting and rolling pipe steel (API specification 5L) in one line. This comprises a casting machine 3 (vertical casting equipment or curved casting equipment), in which the slab 1 is produced by continuous casting in a known manner. Typical dimensions of the slab are between 50 mm and 150 mm in thickness and between 900 mm and 3000 mm in width. In the conveying direction F, only the first furnace 4 and the only rough rolling stand 5 are shown on the casting machine 3 (sometimes a plurality of rough rolling stands are also provided). This is followed by the furnace 6, the only finishing rolling stand 7, the finishing section for rolling slabs or strips (which is usually provided with a plurality of finishing rolling stands), and the cooling section 8.

  There are also other elements that have no meaning or are subordinate to temperature control. A shear 12 is provided between the casting machine 3 and the first furnace 4, and the slab 1 can be cut into a desired slab length by this shear (alternatively, a gas cutting device is used). It is also possible). A descaling device 13 is provided between the first furnace 4 and the rough rolling stand 5. A descaling device 14 is also present immediately before the finishing rolling stand 7. Behind the cooling section 8, a coiler 15 is provided (in a known manner), whereby the finished strip is wound.

  In the case of pipe steel, there is a high demand for slab or strip temperature control in the path through the facility 2.

  Prior to finishing the strip, the desired temperature profile with respect to time or the desired temperature profile with respect to the transport path in the transport direction F is first determined. For this reason, preferably a computerized tissue model, known as such, is used, and in a specialized way, it is set how the temperature of the slab 1 or strip should be changed, which makes it ideal Products can be finished. An exemplary description for such a temperature transition exists further below by mentioning the temperature region of the slab 1 or strip for a particular location of the finishing equipment 2.

  It is important to prepare the equipment 2 so that the desired profile can be run according to a predetermined temperature profile. According to the invention, for the optimization of the temperature of the slab 1, at least one temperature-influencing factor is positioned in the production line of the installation 2 according to a defined temperature profile, Factors affecting the temperature are provided between the first furnace 4 and at least one rough rolling stand 5 and / or between the second furnace 6 and at least one finishing rolling stand 7 and so on. Done.

  In the embodiment of FIG. 1, the temperature-influencing element 9 is a cooling zone, which is effectively brought into the production line behind the second furnace 6. This can be a centralized cooling device or a laminar cooling device, depending on the required cooling performance, i.e., the cooling performance required to achieve the desired temperature profile.

  After passing through the cooling and descaling device 14, continuous finish rolling or reverse finish rolling is performed in at least one finish rolling stand 7, preferably with a plurality of finish rolling stands, ie finish rolling stages. It has been. The finish rolling is performed at the desired finish strip thickness and finish strip temperature, followed by a strip cooling device in the cooling section 8. As a final step, the strip is wound around the coiler 15. Instead of wrapping the finished rolled strip, it is alternatively possible to feed directly to the final part.

  For the finish rolling of tube steel in the frame of classical thermomechanical treatment, a temperature region of 850 ° C. to 950 ° C. is intended behind the furnace 6 and the cooling device 9. The low entry temperature is very low during subsequent transformations (Umwandlung) because during the isothermal rolling in the finishing section, little recrystallization and crystal growth occur and almost all deformation is collected. A fine particulate structure is generated. Another prerequisite is a final rolling temperature typically below 820 ° C. and a sufficiently high cooling rate in the cooling zone.

  Of course, in addition to the cooling of the region between the rough rolling stand 5 and the finishing rolling stand 7 described above, it may be necessary to be able to already influence the temperature of the strip before entering the rough rolling stand 5. There is. On the other hand, FIG. 2 shows an installation 2 for producing pipe steel by API, in which the rear part of the first furnace 4 is replaced by a strip cooling part 10. To be precise, the element 10 affecting the temperature is here brought into the production line as an additional cooling section 10.

  By cooling the slab, the degree of thermomechanical treatment can be significantly increased and crystal growth between the rough rolling section and the finishing rolling section can be limited. In that case, however, complete recrystallization must be ensured, so that this method is particularly suitable for pipe steels having a low microalloy content and a thin slab thickness.

  The extra high alloy element content and thick slab thickness, on the other hand, allow higher conversion degrees and to higher temperatures to ensure complete dynamic or static recrystallization. Even heating may make sense. Furthermore, the elevated temperature can preferably act on the dissolved state of the microalloy element. One embodiment of the invention that makes this possible in a particularly advantageous manner is represented in FIG. Here, after the first furnace 4 and before the roughing stand 5, an element 10 is provided which affects the temperature in the form of an induction heating device.

  FIGS. 4, 5 and 6 show an equipment concept in which the strip cooling section provided before finish rolling is replaced by an induction heating device or furnace, especially when compared to the solutions of FIGS.

  Previously, a classic thermomechanical treatment aimed at maximizing the collected deformation was aimed at, whereas for a given steel other methods should be used . Instead of abandoning further softening in the area of the finishing section after complete recrystallization following rough rolling, a new recrystallization is aimed at. This recrystallization in particular requires high temperatures that are advantageously generated by induction heating devices or DFI oxyfuel furnaces. In this case, recrystallization can be carried out already in the first finishing pass, especially under high temperatures and degree of conversion, and subsequently the accumulation of deformation in the last finishing pass continues. Alternatively, after the accumulation of deformation has taken place in the first finishing pass, dynamic recrystallization is finally carried out in the last finishing pass at moderately high temperatures and degrees of conversion. In both cases, increasing the temperature leads to an increase in the maximum possible conversion compared to the classical thermomechanical treatment, eg according to the solutions of FIGS. As the degree of conversion required to cause recrystallization decreases, the tendency to soften is clearly increased.

  In accordance with the present invention, the expansion of possibilities for influencing the temperature can satisfy the traditional requirements including inconsistencies for temperature transitions in individual equipment areas, so that in each individual area , It is possible to operate with an optimal process transition in terms of product characteristics, ie an optimally selected temperature transition in the slab or strip along the conveying direction F. This allows a flexible adaptation to the desired material properties or material dimensions or different material analyses.

  At the same time, affecting temperature control is a good tool that affects load distribution and reduced distribution in rough and finish rolling stands, which reduces the minimum achievable final thickness It can be used in designing or seeking help from a smaller unit during design.

  The description of the various effects of temperature transitions on the microstructure is necessary at any time to control the development of the structure, and the rolling of the pipe steel by the proposed method is monitored by an appropriate structure model and It indicates that when controlled and / or adjusted, it leads to particularly desired mechanical properties.

  When normal steel is rolled in the same equipment, temperatures of about 1000 ° C. to 1150 ° C. are usually used before the finishing section, but in special cases higher or lower temperatures. The need to adjust the fluctuating temperature increases with the complexity of the alloy concept. This method is particularly advantageous for other phase steels and various microalloy steels. The proposed equipment concept brings slabs, thin-walled slabs, intermediate strips, strips and sheets (Blech) to the temperature levels that are often aimed at, so there are no restrictions on the required material properties.

  For optimum adaptation to the respective process conditions, the strip cooler 9 (in FIGS. 1, 2 and 3) and the induction heating device 10 (in FIGS. 3 and 5) or 9 (in FIG. 4) are transported. It is slidable or swingable in a direction transverse to the direction F, and one unit or the other unit 9, 10 is operated.

  Similarly, according to FIG. 6 instead of FIG. 4, instead of the strip cooling part 10 or the induction heating device 9, conventional compensating furnaces 9, 10 can be carried to the production line. This is true for the various units before and after the rolling equipment.

  The casting machine 3 can be in a production line with a rolling section 5 or can be provided separately from it. For this reason, FIG. 7 shows where the corresponding examples can be seen in the top view. Here, two upper casting machines 3 'are provided in parallel with each other, and behind them, the slab is cut to the desired length by the gas cutting machine 12'. By the walking beam furnace 4 ′ or the pusher furnace, the slab 1 is slid in the lateral direction Q with respect to the conveying direction F from the upper production lines L to the lower production line L. In the lower production line, there is another piece of equipment for finishing the strip. The lower production line L is similarly equipped with a casting machine 3. A shear 12 is provided behind the casting machine.

  The slab 1 is heated by the furnaces 4 and 4 ′ to a rough rolling temperature of approximately 1100 ° C. to 1200 ° C. After the descaling device 13, rough rolling to a continuous or reverse intermediate thickness is performed in one or alternatively on a plurality of rough rolling stands 5.

  The furnace entry temperature can be influenced by the selection of the rolling speed in the rough rolling stand 5.

  A second furnace 6 is provided as a holding furnace behind the rough rolling stand 5. The holding furnace 6 provides a sufficient space in which the thin slab to be converted in the rough rolling stand 5 can be completely accommodated. A short reciprocation of the converted thin slab can also occur in the furnace 6.

  Instead of the holding furnace 6, a roller table capsule or a normal roller table can also be provided. Following the furnace 6 or following the roller table capsule, an element 9 affecting the temperature in the form of a cooling zone is positioned in the production line L, by which the slab 1 is placed in the finishing rolling stand 7. It can be brought to the desired temperature before finish rolling. As an alternative, the strip cooler 9 can also be present before the holding furnace or before the roller table capsule.

  Details of the exchange of the various units by means of a lateral slide or by an entry or exit amplitude of the elements 9, 10 affecting the temperature are described in FIGS. In some cases, in addition, by means of a suitable method apparatus, consideration can be given to sharing one space in the production line by three different units.

  In FIG. 8, it can be seen that one additional furnace (left in FIG. 8) or induction furnace (right in FIG. 6) can be moved to the production line L by sliding in the lateral direction Q as an alternative. The retraction positions 16, 16 'on both sides of the production line L allow both furnaces to slide simultaneously from the position shown to the right and to the opposite.

  An element that affects the temperature of the type of cooling device (on the left side in FIG. 9) and an element 9 that affects the temperature of the type of induction furnace (on the right side of FIG. 9) Ten similar situations are described in FIG. The similar shape of FIG. 10 also applies to the roller hearth furnace (left) and the slab cooling section (right).

  It can be seen in FIG. 11 that the element 9 that affects the temperature in the form of a cooling beam can be swung about the axis of rotation 11, which results in an intervening state or a non-intervening state. In this, the induction furnace 10 is again provided so as to be slidable laterally in the direction Q, and when this is to be brought into the non-intervening state, it is moved to the retracted position 16 '.

1 Slab (strip)
2 facilities
3 Casting machine
3 'casting machine 4 first furnace 4' walking beam furnace or pusher furnace 5 rough rolling stand 6 second furnace
7 Finishing rolling stand
8 Cooling section
9 Factors Affecting Temperature 10 Factors Affecting Temperature]
11 Rotating shaft 12 Shear
12 'gas cutting device 13 descaling device 14 descaling device 15 coiler 16 retracted position 16' retracted position

F Transport direction Q Horizontal slide direction L Production line

Claims (26)

A method for producing microalloy steel, in particular pipe steel, in which the cast slab (1) is transferred in the following order in the conveying direction (F) of the slab (1), Manufacturing method that passes through equipment (2) having one furnace (4), at least one rough rolling stand (5), second furnace (6), at least one finishing rolling stand (7) and cooling section (8) In the method which has the following steps.
a) Define the desired temperature profile of the slab (1) while the slab travels through the facility (2).
b) at least one temperature-influencing factor (9, 10) for optimizing the temperature of the slab (1) according to the defined temperature profile in the production line (L) of the installation (2) Positioning, the elements (9, 10) affecting the temperature between the first furnace (4) and the at least one roughing stand (5) and / or the second furnace (6 ) And at least one finishing rolling stand (7).
c) Production of the slab (1) or strip in the equipment (2) thus configured, with at least one temperature being maintained so that the defined temperature profile is at least largely maintained. Activate the influencing element (9, 10). 2. Method according to claim 1, characterized in that a separate furnace is used as the factor (9, 10) affecting the temperature. The method according to claim 2, wherein an induction furnace is used as another furnace. Method according to claim 2, characterized in that the slab (1) is heated in a separate furnace (DFI oxyfuel furnace) by direct flame energization. Direct flame energization of the slab (1) is effected by gas injection with at least 75% oxygen, during which gaseous or liquid fuel is mixed. 4. The method according to 4. The method according to claim 2, wherein a compensation furnace is used as another furnace. The method according to claim 2, wherein a roller hearth furnace is used as another furnace. The method according to claim 2, wherein a walking beam furnace or a pusher furnace is used as another furnace, which enables a lateral conveyance of the slab. 2. Method according to claim 1, characterized in that a separate cooling zone is used as the factor (9, 10) affecting the temperature. The method according to claim 9, wherein a central cooling section is used as another cooling section. The method according to claim 9, wherein a laminar strip cooling section is used as another cooling section. 2. Method according to claim 1, characterized in that a temperature blocking element is used as the element (9, 10) affecting the temperature. The method according to claim 1, wherein the temperature profile is determined on the basis of a tissue model. The tissue model determines the following parameters: temperature profile for time or number of passes, decreasing distribution for time or number of passes, stop time or round trip time, rolling speed, and conveying speed, and / or heating and cooling strength, and The method according to claim 13, wherein monitoring is performed. The use of a factor (9) that affects the temperature of the cooling device type achieves a very low entry temperature into the at least one finishing mill (7), where there is a significant recrystallization and crystal growth. In this case, the temperature level between the entry into the at least one rough rolling stand (5) and the entry into the element (9) affecting the temperature of the cooling device type is
a) Especially for tube steels with a low microalloy element content and a thin slab thickness, it is lowered by a factor (9) that affects the temperature of the cooling device type, and the finishing rolling section (7 ) The crystal size on entry into) is reduced, or
b) Especially for tube steels with a high microalloy element content and hot slab thickness, increased by a factor (10) affecting the temperature of the type of heating device, during rough rolling Complete recrystallization is guaranteed, or
15. A method according to any one of the preceding claims, wherein c) is simply adjusted and otherwise left unchanged. By using an element (10) that affects the temperature in the form of the heating device, a very high entry temperature to the at least one finishing mill (7) is achieved, so that recrystallization proceeds completely there,
a) already performed in the first finishing pass based on high temperature and decrease, and further accumulation of deformation continues in the last finishing pass, or b) before that based on moderate temperature and decrease. The method according to claim 1, wherein the method is finally performed in the final finishing pass after the deformation is accumulated. Microalloy steel, in particular equipment (2) for the production of pipe steel, in the conveying direction (F) of the slab (1), in the casting machine (3), the first furnace (4), at least one coarse 17. A rolling stand (5), a second furnace (6), at least one finishing rolling stand (7) and a cooling section (8) in this order, in particular according to any one of claims 1 to 16 In equipment for carrying out the described method,
A slab (1) between the first furnace (4) and at least one rough rolling stand (5) and / or between the second furnace (6) and at least one finishing rolling stand (7). The elements (9, 10) that affect the temperature for the optimization of the temperature (9) can be selectively brought into the production line (L), and at that time, the elements (9, 10) that affect the temperature. 10) is a facility characterized in that it can be selected from one of the elements: another furnace, another cooling zone, temperature shut-off element. The installation according to claim 17, wherein the other furnace is an induction furnace. 18. Equipment according to claim 17, characterized in that the further furnace is a furnace (DFI oxyfuel furnace) for energizing a flame directly on the slab (1). The installation according to claim 17, wherein the other furnace is a compensation furnace. The installation according to claim 17, wherein the other furnace is a roller hearth furnace. The installation according to claim 17, characterized in that the further furnace is a walking beam furnace or a pusher furnace allowing the lateral transfer of the slab. The equipment according to claim 17, wherein the other cooling section is a central cooling section. Equipment according to claim 17, characterized in that the further cooling zone is a laminar strip cooling zone. Since at least one of the elements (9, 10) of the separate furnace, the separate cooling section and the temperature shut-off element is provided so as to be slidable laterally (Q) with respect to the slab transport direction (F) 25. Equipment according to any one of claims 17 to 24, characterized in that one of (9, 10) can be selectively brought into the production line (L). Since at least one of the elements (9, 10) of the separate furnace, the separate cooling section, and the temperature shut-off element is provided so as to be swingable about the rotation axis (11) pointing in the transport direction (F), 25. Equipment according to any one of claims 17 to 24, characterized in that one of the elements (9, 10) can be selectively brought into the production line (L).

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