EP4101552A1 - Procédé de fabrication d'acier micro-allié, acier micro-allié fabriqué selon le procédé et installation combinée de coulée et de laminage - Google Patents

Procédé de fabrication d'acier micro-allié, acier micro-allié fabriqué selon le procédé et installation combinée de coulée et de laminage Download PDF

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Publication number
EP4101552A1
EP4101552A1 EP21178473.1A EP21178473A EP4101552A1 EP 4101552 A1 EP4101552 A1 EP 4101552A1 EP 21178473 A EP21178473 A EP 21178473A EP 4101552 A1 EP4101552 A1 EP 4101552A1
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EP
European Patent Office
Prior art keywords
rolled strip
stand
stand group
rolling
finished rolled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP21178473.1A
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German (de)
English (en)
Inventor
Kerstin Baumgartner
Simon Grosseiber
Thomas Lengauer
Gero Schwarz
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Primetals Technologies Austria GmbH
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Primetals Technologies Austria GmbH
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Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP21178473.1A priority Critical patent/EP4101552A1/fr
Priority to CN202280041452.7A priority patent/CN117545564A/zh
Priority to EP22730486.2A priority patent/EP4351812A1/fr
Priority to PCT/EP2022/064188 priority patent/WO2022258376A1/fr
Publication of EP4101552A1 publication Critical patent/EP4101552A1/fr
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • C21D8/0215—Rapid solidification; Thin strip casting
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/004—Dispersions; Precipitations
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2261/00—Machining or cutting being involved
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/60—Continuous furnaces for strip or wire with induction heating

Definitions

  • the invention relates to a method for producing a micro-alloyed steel according to patent claim 1, a micro-alloyed steel according to patent claim 12 and a combined casting and rolling plant according to patent claim 13.
  • an improved method for producing a micro-alloyed steel in a combined casting and rolling plant can be provided in that the combined casting and rolling plant has a continuous casting machine with a mold, a single-stand or multi-stand roughing train, a finishing train with a first stand group with at least one first finishing stand and a second stand group with at least one second finishing stand converted into a stand cooler.
  • a metallic melt is cast in the mold to form a partially solidified strand of thin slabs.
  • continuously cast strands with a thickness of ⁇ 130 mm are referred to as thin slab strands.
  • the partially solidified strand of thin slabs is supported, deflected and cooled.
  • the thin slab strand is rolled into a pre-rolled strip in the pre-rolling train.
  • the first stand group of the finishing train finishes the pre-rolled strip into the finished rolled strip.
  • the finish-rolled finished rolled strip is fed to the second stand group and in the second stand group the finished rolled strip is forced-cooled while maintaining a thickness of the finished rolled strip in such a way that a cooling rate of a core of the finished rolled strip in the second stand group is greater than 20° C./s and less than 200 °C/s is.
  • micro-alloyed steel can be produced in a simple manner.
  • a micro-alloyed steel can also be produced with a metallic melt with 10% fewer micro-alloying elements (e.g. titanium, niobium and/or vanadium), which corresponds, for example, to an X60 to X120 steel according to the API 5L/IS03183:2007 standard , which meets the mechanical requirements for the steel grades according to the standard mentioned.
  • the microalloyed steel can thus be produced in a particularly simple and cost-effective manner by means of the method.
  • a continuously produced strand of thin slabs is rough-rolled and finish-rolled uncut and the micro-alloyed steel is cut to the length of the coil for the first time after it has passed through the cooling section.
  • a third surface temperature at which the finished rolled strip leaves the second stand group is determined.
  • the forced cooling in the second stand group is controlled or regulated as a function of the third surface temperature and a third target temperature in such a way that the third surface temperature essentially corresponds to the third target temperature.
  • the third setpoint temperature is lower than a ferrite-pearlite transformation temperature, preferably lower than a bainite start temperature, in particular lower than a martensite start temperature.
  • a second surface temperature at which the finished rolled strip leaves the first stand group is determined.
  • the second surface temperature is also taken into account when controlling the forced cooling of the finished rolled strip in the second stand group.
  • the cooling rate of the core of the finished rolled strip is 20° C./s to 80° C./s, in particular 45° C./s to 55° C./s. This ensures that a high-strength, e.g. bainitic and/or martensitic micro-alloyed steel can be produced.
  • the core of the finish-rolled finish-rolled strip is transported into the second stand group of the finishing train at a first exit temperature of 830° C. to 950° C., in particular from 880° C. to 920° C.
  • the core of the finished rolled strip has a second exit temperature of less than 700°C, in particular from 350°C to 700°C, preferably from 400°C to 460°C.
  • the core of the finished rolled strip is cooled, preferably continuously, from the first exit temperature to the second exit temperature in a time interval of 2 seconds to 40 seconds.
  • the finish rolled strip enters the second stand group within a time interval of 1 second to 15 seconds after the finish rolling of the finish rolled strip in the first stand group. Due to the short time interval, the finished rolled strip is cooled down from a particularly high first outlet temperature. Furthermore, unwanted cooling of the finished rolled strip between the first group of stands and the second group of stands is kept particularly low.
  • the combined casting-rolling facility has a cooling section downstream of the finishing train in relation to a conveying direction of the finished rolled strip and a coiler device downstream of the cooling section. Forced cooling of the finished rolled strip in the cooling line is deactivated, and the finished rolled strip is transported through the cooling line from the second stand group to the coiler. This allows the finished rolled strip to dry in the cooling line, so that the finished rolled strip is coiled dry into a coil. Furthermore, wear and tear on the cooling line is reduced and the maintenance effort for the cooling line is minimized as a result.
  • the grain size of the pre-rolled strip when it leaves the pre-rolling train is 10 ⁇ m to 30 ⁇ m.
  • the grain size of the pre-rolled strip between the pre-rolling train and the entry into the first stand group increases to 20 ⁇ m to 60 ⁇ m or the grain size remains the same.
  • the grain size of the finished strip when rolling in the first stand group is reduced to 2 ⁇ m to 20 ⁇ m.
  • the structure has a "pancake structure" when the finished strip emerges from the first group of stands.
  • the thickness of the pre-rolled strip when it enters the first stand group is 40 mm to 62 mm, in particular 45 mm.
  • the first stand group reduces the thickness of the pre-rolled strip to 10 mm to 25 mm, in particular 16 mm to 20 mm. This thickness is particularly suitable for the manufacture of tubes from the micro-alloyed steel.
  • the metallic melt has a chemical composition in weight percent of C 0.025-0.05%; Si 0.1-0.3%; Mn 0.07-1.5%, Cr ⁇ 0.15%; Mo ⁇ 0.2%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%;N ⁇ 0.008%; remainder Fe and unavoidable impurities.
  • the process reduces the limits of carbon, silicon and chromium. Molybdenum can be added to increase strength.
  • the metallic melt for X80 to X120 steels preferably has a chemical composition in weight percent of C 0.025-0.09%; Si 0.1-0.3%; Mn 0.07-2.0%, Cr ⁇ 0.5%; Mo ⁇ 0.5%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%; Ni ⁇ 0.5%; Cu ⁇ 0.4%;N ⁇ 0.01%; remainder Fe and unavoidable impurities.
  • the microalloyed steel for a X60 or a X70 steel preferably has a chemical composition in weight percent of C 0.025-0.05%; Si 0.1-0.3%; Mn 0.07-1.5%, Cr ⁇ 0.15%; Mo ⁇ 0.2%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%;N ⁇ 0.008%; remainder Fe and unavoidable impurities.
  • the microalloy steel for X80 to X120 steels preferably has a chemical composition in weight percent of C 0.025-0.09%; Si 0.1-0.3%; Mn 0.07-2.0%, Cr ⁇ 0.5%; Mo ⁇ 0.5%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%; no ⁇ 0.5%; Cu ⁇ 0.4%;N ⁇ 0.01%; remainder Fe and unavoidable impurities.
  • the microalloyed steel has at least one of the following precipitates: Ti(C,N), Nb(C,N) and/or V(C,N).
  • a precipitation density of the precipitations is 10 15 -10 25 1/m 3 .
  • the precipitates have an average size of 1 nm to 20 nm.
  • an improved casting-rolling compound plant for the production of a micro-alloyed steel has a continuous casting machine with a mold, a single-stand or multi-stand roughing train and a finishing train with at least a first stand group and a second framework group.
  • a metallic melt can be cast in the mold to form a partially solidified thin slab strand and the thin slab strand can be fed to the roughing train.
  • the roughing train is designed to roll the completely solidified thin slab strand into a pre-rolled strip, with the pre-rolled strip being able to be fed to the finishing rolling train.
  • the first stand group is designed to finish-roll the pre-rolled strip into a finish-rolled strip.
  • the second stand group is arranged downstream of the first stand group and has at least one second finishing stand converted into a stand cooler.
  • the second stand group is designed to forcibly cool the finished rolled strip while maintaining a thickness of the finished rolled strip such that a cooling rate of a core of the finished rolled strip in the second stand group is greater than 20° C./s and less than 200° C./s.
  • the combined casting and rolling plant can be used flexibly to produce thin sheets with a thickness of 0.8 mm to 2.5 mm and to produce the finished rolled strip from the micro-alloyed steel with the above-mentioned thickness of 8 mm to 25 mm.
  • the compound casting-rolling facility has a cooling section downstream of the second stand group in relation to the conveying direction of the finished rolled strip and a coiler device downstream of the cooling section.
  • forced cooling of the finished rolled strip in the second stand group forced cooling of the finished rolled strip in the cooling section is deactivated.
  • the cooling section is designed exclusively to transport the finished rolled strip to the coiler and preferably to dry the finished rolled strip. This configuration has the advantage that the combined casting and rolling facility can be operated in a particularly energy-efficient manner. Furthermore, the finished rolled strip can be coiled up dry, so that corrosion of the finished rolled strip is avoided.
  • the compound casting-rolling system has a third temperature measuring device and a control unit, the third temperature measuring device and the second stand group being connected to the control unit in terms of data technology.
  • the third temperature measuring device is arranged between the second group of stands and the cooling section in relation to the conveying direction of the finished rolled strip and is designed to determine a third surface temperature of the finished rolled strip.
  • the control unit is designed to control the forced cooling of the second stand group on the basis of the determined third surface temperature of the finished rolled strip and a predefined third setpoint temperature.
  • FIG 1 shows a schematic representation of a combined casting and rolling system 10 according to a first embodiment.
  • the combined casting and rolling facility 10 has, for example, a continuous casting machine 15, a roughing train 20, a first to third separating device 25, 30, 35, an intermediate heater 40, preferably a descaler 45, a finishing train 50, a cooling section 55, a coiler 60 and a Controller 65 on.
  • the combined casting and rolling facility 10 can have a first to third temperature measuring device 70, 75, 80, for example a pyrometer.
  • the continuous casting machine 15 is embodied as a curved strand machine, for example.
  • the continuous casting machine 15 has a ladle 85 , a distributor 86 and a mold 90 .
  • the distributor 86 filled with a metallic melt 95 by means of the pan 85 .
  • the metallic melt 95 can be produced, for example, by means of a converter, for example in a Linz-Donawitz process.
  • the metallic melt 95 is a steel melt.
  • the metallic melt 95 flows from the distributor 86 into the mold 90. In the mold 90, the metallic melt 95 is cast into a thin slab strand 100.
  • the partially solidified strand of thin slab 100 is pulled out of the mold 90 and, due to the design of the continuous casting machine 15 as a curved continuous casting machine, is deflected in an arc into a horizontal line, being supported and solidified in the process.
  • the thin slab strand 100 is conveyed away from the mold 90 in the conveying direction.
  • the continuous casting machine 15 casts an endless thin slab strand 100 and feeds it to a roughing train 20 arranged downstream in the conveying direction of the thin slab strand 100 .
  • the roughing train 20 follows directly the continuous casting machine 15.
  • the roughing train 20 can have one or more roughing stands 105 which are arranged one behind the other in the conveying direction of the thin slab strand 100 .
  • the number of roughing stands 105 can essentially be freely selected and is essentially dependent on the format of the thin slab strand 100 and on a desired thickness of the roughing strip 110. In the embodiment, three roughing stands 105 are used as an example for the in FIG 1 roughing train 20 shown is provided.
  • the roughing train 20 is designed to roll the thin slab strand 100 , which is hot when it is fed into the roughing train 20 , into a pre-rolled strip 110 .
  • the first and second separating devices 25, 30 are arranged downstream of the roughing train 20 in relation to the conveying direction of the pre-rolled strip 110.
  • the second separating device 30 is spaced apart in relation to the conveying direction of the pre-rolled strip 110 arranged to the roughing train 20.
  • a discharge device can be arranged between the first separating device 25 and the second separating device 30 .
  • the second separating device 30 can also be dispensed with.
  • the first and/or second separating device 25, 30 can be designed, for example, as drum shears or pendulum shears.
  • the combined casting and rolling plant is operated in continuous operation, i.e. the thin slab strand enters the roughing train 105 uncut, the pre-rolled strip passes through the first and/or second cutting device uncut and the pre-rolled strip uncut in the Finish rolling train 50 is finish-rolled and is cut off to bundle length only after passing through the cooling section 55 .
  • the intermediate heating 40 follows the second separating device 30.
  • the intermediate heating 40 is designed, for example, as an induction furnace. A different configuration of the intermediate heater 40 would also be possible.
  • the intermediate heater 40 is arranged upstream of the finishing train 50 and the descaler 45 with respect to the conveying direction of the pre-rolled strip 110 .
  • the descaler 45 is arranged directly upstream of the finishing train 50 and downstream of the intermediate heater 40 .
  • the finishing train 50 has a first stand group 115 and a second stand group 120 in the embodiment.
  • the first stand group 115 is arranged in front of the second stand group 120 in relation to the conveying direction of the pre-rolled strip 110 .
  • the first group of stands 115 can have two to four first finishing stands 125, for example.
  • the first finishing rolling stands 125 are arranged one behind the other in relation to the conveying direction of the pre-rolled strip 110 .
  • the first stand group 115 directly follows the descaler 45 in relation to the conveying direction of the pre-rolled strip 110, if the descaler 45 is provided. If the descaler 45 is dispensed with, the first stand group 115 is directly connected to the intermediate heater 40 .
  • the second group of stands 120 has at least one, preferably two, second finishing rolling stands 130, it being possible for the first finishing rolling stand 125 and the second finishing rolling stand 130 to be constructed identically. In the embodiment, however, the second finishing rolling stand 130 also has the option of being converted into a stand cooler 135 . In the embodiment, the two second finishing stands 130 are each converted into a stand cooler 135 . In the function of the stand cooler 135, the second finishing stand 130 no longer carries out a rolling process.
  • the second stand group 120 can have at least one intermediate cooler 140 .
  • the intermediate cooler 140 can be arranged between two finishing rolling stands 125, 130, respectively.
  • the second stand group 120 has, for example, two intermediate coolers 140, with a first of the two intermediate coolers 140 being arranged, for example, between the last first finishing rolling stand 125 of the first stand group 115 in the conveying direction and the second finishing rolling stand 130 arranged first in the conveying direction.
  • a further intermediate cooler 140 can also be arranged between the two second finishing rolling stands 130 .
  • the intercoolers 140 can also be dispensed with, or only one of the two intercoolers 140 can be provided.
  • the framework cooler 135 and the intermediate cooler 140 each have at least one cooling beam.
  • the cooling beams of the stand cooler 135 and/or the intermediate cooler 140 are each preferably arranged both on the upper side and on the lower side of the finished rolled strip 145 in order to cool the finished rolled strip 145 particularly quickly and effectively on both sides.
  • each stand cooler 135 can have two cooling beams arranged on the upper side and two cooling beams arranged on the underside of the finished rolled strip 145 .
  • the first finishing rolling stands 125 finish-roll the pre-rolled strip 110 fed into the first stand group 115 to form a finished rolled strip 145 .
  • the cooling section 55 is arranged downstream of the finishing train 50 in relation to a conveying direction of the finished rolled strip 145 .
  • the third separating device 35 is arranged downstream of the cooling section 55 in the conveying direction of the finished rolled strip 145 . In this case, the third separating device 35 is arranged between the coiling device 60 and the cooling section 55 .
  • the third separating device 35 can be designed, for example, as drum shears or pendulum shears.
  • the control device 65 has a control device 150 , a data memory 155 and an interface 160 .
  • the data memory 155 is connected in terms of data technology to the control device 150 by means of a first data connection 165 .
  • the interface 160 is also connected in terms of data technology to the control device 150 by means of a second data connection 170 .
  • a predefined first setpoint temperature, a predefined second setpoint temperature and a predefined third setpoint temperature TS3 are stored in the data memory 155 . Furthermore, a method for producing the micro-alloyed steel is stored in the data memory 155, on the basis of which the control device 150 controls the components of the combined casting and rolling facility 10 .
  • the interface 160 is connected to the intermediate heater 40 by means of a third data connection 175 .
  • a fourth data connection 180 connects the finishing train 50 to the interface 160 in terms of data technology.
  • a fifth data connection 185 connects the cooling section 55 to the Interface 160.
  • the temperature measuring device 70, 75, 80 is connected in terms of data technology to the interface 160 in each case via an assigned sixth to eighth data connection 190, 195, 200.
  • further data connections can be provided in addition to the other components of the combined casting and rolling system 10, so that an exchange of information between the various components of the combined casting and rolling system 10 and the control unit 65 is possible.
  • the third to eighth data connection 175, 180, 185, 190, 195, 200 can be part of an industrial network, for example.
  • FIG 2 shows a flowchart of a method for operating the in FIG 1 Casting-rolling combination plant 10 shown.
  • the second finishing rolling stands 130 or the second finishing rolling stand 130 of the second stand group 120 are converted to the configuration as a stand cooler 135 .
  • work rolls can be removed from the second finishing stand 130 and replaced by the cooling beams.
  • the chilled beam can be aligned in such a way that it is directed in the direction of a passage through which the finished rolled strip 145 is fed.
  • the structure corresponds to that in FIG 1
  • Casting-rolling compound plant 10 shown no longer has the conventional structure of an endless continuous casting plant, but deviates from its structure.
  • the combined casting and rolling facility 10 is no longer suitable for producing a thin finished rolled strip 145 with a thickness of 0.8 mm to 8 mm.
  • FIG 3 shows a first diagram of a core temperature of a core of the finished rolled strip 145 in the manufacture of the finished rolled strip 145 plotted against a time t.
  • FIG 4 shows a first in 3 marked section A of the in 3 first diagram shown.
  • 5 shows a second in 3 marked section B of the in 3 first diagram shown.
  • 6 shows a second diagram of a course of a grain size K in the manufacture of the finished rolled strip 145 plotted over time t.
  • the following are the 2 to 6 explained together.
  • To individual process steps in the 3 to 7 to mark is the respective reference number of the associated process step in the 3 to 7 specified.
  • FIG 4 a first graph 400 and a second graph 405 are plotted.
  • the first graph 400 shows the temperature profile of the core when carrying out the following FIG 2 described procedure.
  • the second graph 405 shows a temperature profile of the core when using the in FIG 1 Casting-rolling compound plant 10 shown and three rolling finishing rolling stands 125, 130 and the cooling section 55 the finishing rolled strip 145 is produced with the above-mentioned thickness of 10 mm to 25 mm.
  • a first method step 305 the mold 90 (in FIG 1 shown) of the continuous casting machine 15 with a dummy bar head (not shown in FIG 1 ) closed and sealed with additional sealing material.
  • the metallic melt 95 is filled into a distributor of the continuous casting machine 15 with the ladle 85 .
  • a plug is removed from a shroud of the continuous casting machine 15 .
  • the metallic melt 95 has a chemical composition in weight percent of C 0.025-0.05% for a X60 or a X70 steel; Si 0.1-0.3%; Mn 0.07-1.5%, Cr ⁇ 0.15%; Mo ⁇ 0.2%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%;N ⁇ 0.008%; remainder Fe and unavoidable impurities.
  • the metallic melt 95 may preferably have a weight percent chemical composition of C 0.025-0.09% for X80 to X120 steels; Si 0.1-0.3%; Mn 0.07-2.0%, Cr ⁇ 0.5%; Mo ⁇ 0.5%; Nb 0.02-0.08%; Ti ⁇ 0.05%;V ⁇ 0.08%; Ni ⁇ 0.5%; Cu ⁇ 0.4%;N ⁇ 0.01%; Remainder Fe and unavoidable impurities.
  • the specification of the steel refers based on the API 5L/IS03183:2007 standard.
  • the metallic melt 95 can also have a different chemical composition.
  • the temperatures and process steps specified below relate to the compositions of the steel preferred in the embodiment in order to use the combined casting and rolling system 10 to produce a micro-alloyed steel, in particular a micro-alloyed tubular steel with a steel grade X60 to X120 in accordance with the API 5L/IS03183 standard: to produce in 2007.
  • the metallic melt 95 in the mold 90 flows around the dummy bar head and solidifies by cooling in the dummy bar head.
  • the dummy bar head is slowly pulled out of the mold 90 of the continuous casting machine 15 in the direction of the roughing train 20 .
  • the metallic melt 95 in the mold 90 cools down at its contact surfaces with the mold 90 and forms a shell of the thin slab strand 100 .
  • the shell encloses a still liquid core and holds the liquid core.
  • the thin slab strand 100 can have a thickness of 100 mm to 150 mm, for example.
  • the continuous casting machine 15 the thin slab strand 100 is deflected and further cooled on the way to the roughing train 20, so that the thin slab strand 100 hardens from the outside to the outside.
  • the continuous casting machine 15 is designed as a curved continuous casting machine, so that the thin slab strand 100 is fed essentially horizontally into the roughing train 20 by deflecting the thin slab strand 100 by essentially 90° from the vertical.
  • the thin slab strand 100 is rolled in the roughing train 20 by the roughing stands 105 to form the pre-rolled strip 110.
  • a microstructure of the thin slab strand 100 has a grain size K of about 800 ⁇ m to 1000 ⁇ m.
  • the thickness is successively reduced to, for example, 40 mm to 62 mm, in particular 45 mm.
  • the structure of the thin slab strand 100 recrystallizes during hot rolling to form the pre-rolled strip 110, so that the structure of the pre-rolled strip 110 is preferably completely recrystallized when it is fed out of the roughing train 20.
  • the microstructure of the thin slab strand 100 towards the pre-rolled strip 110 is homogenized by the individual hot-rolling steps in the roughing stands 105 .
  • the grain size K can be 10 ⁇ m to 30 ⁇ m when leaving the roughing train.
  • a core temperature T of the core of the thin slab strand 100 upon entry into the roughing train 20 with the chemical compositions mentioned above is approximately 1300 to 1450°C. With each rolling step in the roughing train 20, the core temperature of the core is reduced, so that the roughed strip 110 has a core temperature of approximately 980 to 1150° C. when it exits.
  • a third method step 315 the pre-rolled strip 110 is guided through the first and second cutting device 25, 30, with the pre-rolled strip 110 not being cut off.
  • the first and second separating device 25, 30 is thus only run through.
  • the pre-rolled strip 110 cools down further as a result of convection, and the cooling can be reduced by a protective cover.
  • the grain size K in the pre-rolled strip 110 can increase from 20 ⁇ m to 60 ⁇ m.
  • the grain size K in particular with the chemical compositions of the melt 95 mentioned above, can also be retained and not increase.
  • the control device 150 activates the intermediate heater 40, so that the intermediate heater 40, which is designed, for example, as an induction furnace, the core temperature of the pre-rolled strip 110 of about 870 ° C up to 980 °C when entering the intermediate heater 40 to around 1050 °C to 1100 °C (cf. 3 ).
  • the grain size K can be kept essentially constant in the structure during heating (cf. 6 ).
  • the first temperature measuring device 70 determines a first surface temperature of the pre-rolled strip 110 guided out of the intermediate heater 40.
  • the first temperature measuring device 70 provides first information about the first surface temperature of the pre-rolled strip 110 between the intermediate heater 40 and the descaler 45 via the sixth data connection 190 of the interface 160 which provides the first information to the control device 150 .
  • a sixth method step 330 the control device 150 regulates a heat output of the intermediate heater 40 such that the determined first surface temperature of the pre-rolled strip 110 between the intermediate heater 40 and the descaler 45 essentially corresponds to the first setpoint temperature.
  • the control device 150 can regularly repeat the fifth and sixth method step 325, 330 in a loop at a predefined time interval.
  • a seventh method step 335 the control device 150 activates the descaler 45 (if present).
  • the descaler 45 descales the pre-rolled strip 110.
  • the pre-rolled strip 110 cools down, for example, by about 80° C. to 100° C. based on the core of the pre-rolled strip 110.
  • the pre-rolled strip 110 is transported to the first stand group 115 of the finishing train 50 at the first inlet temperature TE1 .
  • the first entry temperature TE1 based on the core of the pre-rolled strip 110, at which the pre-rolled strip 110 enters the first stand group 115 after the descaler 45, can be between 850 °C and 1060 °C, in particular between 920 °C and 980 °C be.
  • the structure of the pre-rolled strip 110 is preferably homogeneously austenitic and recrystallized.
  • the pre-rolled strip 110 is finish-rolled to form the finish-rolled strip 145, for example by means of three first finishing rolling stands 125.
  • the pre-rolled strip 110 to be rolled into the finished rolled strip 145 cools by about 50° C.
  • the thickness of the pre-rolled strip 110 is reduced from, for example, 40 mm to 62 mm, in particular 45 mm, to a thickness of 10 mm to 25 mm, in particular 16 mm to 20 mm, via the three first finishing rolling stands 125 .
  • a "pancake” or a recrystallized austenitic structure is formed in the pre-rolled strip 110 rolled into the finished rolled strip 145 (cf. 5 ).
  • the grain size K when exiting the first framework group 115 is 2 ⁇ m to 20 ⁇ m.
  • a first exit temperature TA1 of the finished rolled strip 145 after passing through the first stand group 115 is preferably 830° C. to 950° C.
  • the first outlet temperature TA1 is 880°C to 920°C.
  • the first exit temperature TA1 relates to the core of the finished rolled strip 145 .
  • the finish-rolled finish rolled strip 145 is transported further in the direction of the second stand group 120 at the first exit temperature TA1 .
  • the fact that the second group of stands 120 directly adjoins the first group of stands 115 means that the time it takes to exit from the first group of stands 115 and into the second group of stands 120 is minimal.
  • the length of time for example at a conveying speed of 0.4 m/s to 1 m/s, can be reduced by arranging the second stand group 120 directly downstream of the first stand group 115 can be as little as 1 second to 15 seconds.
  • the intermediate cooler 140 adjoining the first group of stands 115 can spatially adjoin the first group of stands 115 up to a few meters (less than 10 m) up to about 0.5 meters.
  • the first exit temperature TA1 essentially corresponds to a second entry temperature TE2 at which the finish-rolled finish rolled strip 145 enters the second stand group 120.
  • a second surface temperature of the finished rolled strip 145 coming from the first stand group 115 is determined by means of the second temperature measuring device 75 .
  • the second temperature measuring device 75 provides second information with the first outlet temperature TA1 via the seventh data connection 195 and the interface 160 of the control device 150 .
  • the control device 150 can also take the second surface temperature into account when controlling the intermediate heater 40 .
  • the second surface temperature correlates with the first outlet temperature TA1, the second surface temperature deviating in value from the first outlet temperature TA1.
  • the intermediate heater 40 is regulated in such a way that the second surface temperature essentially corresponds to a second setpoint temperature.
  • the second temperature measuring device 75 and the tenth method step 350 can also be dispensed with.
  • control device 150 activates intermediate cooler 140 and stand cooler 135.
  • Intermediate cooler 140 and stand cooler 135 spray a cooling medium, for example water, possibly with an additive, onto finished rolled strip 145, so that finished rolled strip 145 is in the second stand group 120 is forcibly cooled.
  • the flow rate of the cooling medium is chosen such that within the second stand group 120 the finished rolled strip 145 of the second inlet temperature TE2 is cooled to a second outlet temperature TA2 of less than 700° C., in particular from 350° C. to 700° C., in particular from 400° C. to 460° C., within 2 to 40 seconds.
  • the control device 150 controls the delivery quantity of the cooling medium in such a way that a cooling capacity of the second stand group 120 ensures a cooling rate of the core of the finished rolled strip 145 of at least 20° C./s to 200° C./s.
  • the cooling rate is preferably 20° C./s to 80° C./s, in particular 45° C./s to 55° C./s, with the cooling in the core via the second framework group 120 preferably taking place continuously.
  • this cooling speed is ensured by the fact that preferably two intermediate coolers 140 and two frame coolers 135 are provided. For example, about 100 m 3 /h to 300 m 3 /h of the cooling medium can be applied to the finished rolled strip 145 at a pressure of 2 bar to 4 bar per cooling beam of the stand cooler 135 . This ensures that within the short throughput time of the finished rolled strip 145 through the second stand group 120, the core of the finished rolled strip 145 from the second inlet temperature TE2 of, for example, 870 °C to 910 °C to the second outlet temperature TA2, for example 400 °C to 460 °C , is cooled.
  • the second inlet temperature TE2 of, for example, 870 °C to 910 °C to the second outlet temperature TA2
  • Each scaffolding cooler 135 can be configured in such a way that a control valve that can be controlled by control device 150 is provided for each cooling beam in order to control them separately from the other cooling beam of intermediate cooler 140 or the other scaffolding cooler 135, preferably steplessly and separately from one another.
  • a volume flow of the cooling medium can be continuously regulated between 0% and 100% by the control device 150 for each chilled beam.
  • the third temperature measuring device 80 determines a third surface temperature, which correlates with the second exit temperature TA2, after the finished rolled strip 145 has exited the second stand group 120.
  • the third temperature measuring device 80 provides third information via the third surface temperature via the eighth data connection 200 of the interface 160 and via the interface 160 of the control device 150 .
  • the control device 150 can also take into account the information about the third surface temperature and control the volume flow of the cooling medium in such a way that the third surface temperature essentially corresponds to the third setpoint temperature TS3.
  • the second surface temperature can also be taken into account when regulating the volume flow, in order to ensure a uniformly high cooling rate in the second stand group 120 .
  • the control device 150 can repeat the eleventh and twelfth method step 355, 360 regularly in a loop at a predefined time interval.
  • a thirteenth method step 365 the finished rolled strip 145 is transported into the cooling section 55 in the cooled state.
  • the control device 150 deactivates or keeps the cooling section 55 in the deactivated state, so that when the finished rolled strip 145 runs through the cooling section 55, no further cooling medium is applied to the finished rolled strip 145 for further forced cooling of the Finished rolled strip 145 is brought.
  • this is not necessary due to the high cooling capacity of the second stand group 120, and on the other hand, the convective cooling as it passes through the cooling section 55 is sufficient for further cooling of the finished rolled strip 145 from the second outlet temperature TA2 to a third outlet temperature TA3, which is below the second outlet temperature TA2.
  • the cooling medium remaining on the finished strip in particular cooling water, dries in the cooling section 55 . As a result, the finished rolled strip 145 cools down further in the cooling zone 55 .
  • control device 150 can also activate the cooling section 55 in order to forcibly cool the finished rolled strip 145 from the second outlet temperature TA2 to the third outlet temperature TA3.
  • a fourteenth method step 370 the finished rolled strip 145 , which has been further cooled in the cooling section 55 , is guided through the third separating device 35 to the coiling device 60 .
  • the finish-rolled, dried and cooled finish-rolled strip 145 is wound into a coil in the coiling device 60 .
  • the control device 150 can activate the third separating device 35 so that the finished rolled strip 145 continuously conveyed out of the cooling section 55 is separated from the coil and the coil can be removed.
  • the further finished rolled strip 145 transported through the cooling section 55 can be wound onto a new coil.
  • the casting-rolling compound system 10 described above and the FIG 2 The methods described have the advantage that the mechanical conditions for an X70 to X120 micro-alloyed steel can be met with the chemical composition, for example with a chemical composition for an X60 steel.
  • the micro-alloyed steel is particularly suitable as a micro-alloyed pipe steel for the production of pipes, pipelines or pressure tanks. Due to the cooling immediately following the first stand group 115 by means of the Stand coolers 135 converted second finishing rolling stands 130 and the intermediate coolers 140 can ensure particularly good material properties for the micro-alloyed steel. This makes the micro-alloyed steel particularly tough and strong. Furthermore, the combined casting and rolling system 10 has a particularly precise temperature control.
  • the combined casting and rolling plant 10 can be operated conventionally if no micro-alloyed steel, in particular no micro-alloyed pipe steel, is to be produced , the stand coolers 135 being converted back into second finishing rolling stands 130 in conventional operation. Furthermore, in conventional operation, the intercoolers 140 are deactivated and the cooling section 55 is activated.
  • the finished rolled strip 145 is then rolled by all five finishing rolling stands 125, 130 and the cooling of the finished rolled strip 145 essentially takes place in the cooling line 55 instead of in of the second stand group 120 to the second exit temperature TA2.
  • the second graph 405 (cf. FIG 4 ) clearly shows how the finished rolled strip 145 slowly cools down from the first exit temperature TA1 to the second exit temperature TA2.
  • the first exit temperature TA1 is about 800 ° C to 950 ° C.
  • the finished rolled strip 145 is only cooled down in the cooling section 55 and a core temperature then drops rapidly there. Because the finished rolled strip 145 slowly cools by about 50 °C to 100 °C over a period of about 15 to 50 seconds, the FIG 2 Microalloyed steel that can be produced using the method described above cannot be produced. To a desired micro-alloyed steel to produce with these properties, additional alloying additives are required in the conventional operation of the in FIG 1 Casting-rolling compound plant 10 shown is necessary.
  • the first graph 400 which shows the temperature profile of the in FIG 2
  • the method shown clearly shows how quickly the core of the finished rolled strip 145 is cooled from the first exit temperature TA1 to the second exit temperature TA2.
  • a higher-alloy steel for example an X70 to X120 steel
  • a chemical alloy which corresponds to an X60 steel
  • FIG 7 shows a schematic TTT diagram for an X60 steel melt.
  • the third setpoint temperature TS3 is given as a function of a desired micro-alloyed steel to be produced.
  • the third setpoint temperature TS3 is selected at least lower than a ferrite-pearlite transformation temperature Ar 1 , preferably lower than a bainite start temperature, in particular lower than a martensite start temperature M s .
  • the finished rolled strip 145 in the second stand group 120 can be cooled in the twelfth method step 360.
  • the control device 150 controls the volume flow of the cooling medium fed to the finished rolled strip 145 and thus the cooling rate. If the third setpoint temperature TS3 is selected to be particularly low, the control device 150 controls the second stand group 120 in such a way that it cools the finished rolled strip 145 with a particularly large quantity of cooling medium.
  • the third setpoint temperature TS3 is set above a martensite start temperature M s , a micro-alloyed steel with the mechanical properties of an X80 steel can be produced using the X60 steel melt 95 mentioned above.
  • the third setpoint temperature TS3 is set higher than just described, micro-alloyed steel with the mechanical properties of an X70 steel can be produced with the X60 steel melt.
  • the X70 and X80 micro-alloyed steels each have a predominantly bainitic B phase fraction, while the X120 micro-alloyed steel essentially has a martensite M phase fraction of 25-65%.
  • the microalloyed steel can have at least one of the following precipitates: Ti (C, N), Nb (C, N) and/or V (C, N).
  • a precipitation density of the precipitation(s) is 10 15 to 10 25 1/m 3 .
  • the precipitate has an average size of 1 nm to 20 nm.
  • FIG. 8 shows a schematic representation of a combined casting and rolling plant 10 according to a second embodiment.
  • the combined casting and rolling system 10 is essentially identical to that in FIG 1 Casting-rolling compound plant 10 shown is formed. In the following, only the differences of the in 8 Casting-rolling compound plant 10 shown compared to the first embodiment of the casting-rolling compound plant 10 shown in FIG 1 shown.
  • Deviating from FIG 1 is in 8 only the last second finishing stand 130 of the second stand group 120 is converted to the stand cooler 135.
  • the second finishing rolling stand 130 which is arranged upstream in the conveying direction relative to the finishing rolled strip 145, is not converted and is designed as a finishing rolling stand 130 for rolling.
  • the two in FIG 1 shown intercooler 140 are in 8 also provided.
  • the method described is also used with the in 8 shown, but when the finished rolled strip 145 is passed through the front second finishing rolling stand 130 of the second stand group 120, no rolling of the finished rolled strip 145 is carried out, but the second finishing rolling stand 130 is used exclusively for transporting the finished rolled strip 145. This means that the finishing strip 145 is passed through the non-converted second finishing stand 130 while substantially maintaining its thickness.
  • the configuration of the combined casting and rolling system 10 shown has the advantage that, by means of short conversion times, for example on the basis of a chemical composition of a micro-alloyed steel for an X60 steel, it is inexpensive a mechanically superior micro-alloyed steel, for example X70 steel, can be produced.

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EP21178473.1A 2021-06-09 2021-06-09 Procédé de fabrication d'acier micro-allié, acier micro-allié fabriqué selon le procédé et installation combinée de coulée et de laminage Withdrawn EP4101552A1 (fr)

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EP21178473.1A EP4101552A1 (fr) 2021-06-09 2021-06-09 Procédé de fabrication d'acier micro-allié, acier micro-allié fabriqué selon le procédé et installation combinée de coulée et de laminage
CN202280041452.7A CN117545564A (zh) 2021-06-09 2022-05-25 用于制造微合金化钢的方法、用该方法制造的微合金化钢、以及铸轧复合装备
EP22730486.2A EP4351812A1 (fr) 2021-06-09 2022-05-25 Procédé de fabrication d'un acier micro-allié, acier micro-allié produit à l'aide du procédé et installation combinée de coulée/laminage
PCT/EP2022/064188 WO2022258376A1 (fr) 2021-06-09 2022-05-25 Procédé de fabrication d'un acier micro-allié, acier micro-allié produit à l'aide du procédé et installation combinée de coulée/laminage

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