EP3305437B1 - Stranggiess- und walzverfahren - Google Patents

Stranggiess- und walzverfahren Download PDF

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Publication number
EP3305437B1
EP3305437B1 EP15894344.9A EP15894344A EP3305437B1 EP 3305437 B1 EP3305437 B1 EP 3305437B1 EP 15894344 A EP15894344 A EP 15894344A EP 3305437 B1 EP3305437 B1 EP 3305437B1
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EP
European Patent Office
Prior art keywords
rolling
slab
outlet
caster
mode
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EP15894344.9A
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English (en)
French (fr)
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EP3305437A1 (de
EP3305437A4 (de
Inventor
Yong-Seok Cho
Jea-Sook CHUNG
Suk-Cheol Song
Kyeong-Mi Park
Young-Sup Shim
Young-Ju Ko
Yong-Ki Kim
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Posco Holdings Inc
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Posco Co Ltd
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    • 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
    • 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
    • B21B1/466—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 non-continuous process, i.e. the cast being cut before rolling
    • 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
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating 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
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • 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
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/163—Controlling or regulating processes or operations for cutting cast stock
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

Definitions

  • the present disclosure relates to a continuous casting and rolling method, and more particularly, to an invention for selecting mode switching between a continuous rolling mode and a discontinuous rolling mode.
  • Patent documents US2010275667 and KR20130075799 also disclose a continuous casting and rolling method able to cast and roll a slab based on production parameters such as the slab temperature or the casting velocity.
  • each of a continuous rolling mode continuously performing a continuous casting process and a rolling process and a discontinuous rolling mode discontinuously performing the continuous casting process and the rolling process may be performed.
  • a slab is continuously provided between a caster and a rolling mill, so that a rolling process in the rolling mill is dependent on a slab production speed, or the like, in the caster.
  • a slab is not continuously provided between a caster and a rolling mill, so a degree to which a rolling process in a rolling mill is dependent on a caster may be mitigated, as compared to that in a continuous rolling mode.
  • process states in a continuous rolling mode and a discontinuous rolling mode may be different.
  • selection of a continuous rolling mode and a discontinuous rolling mode is arbitrary, and selection is not made by any clear criteria.
  • a trial and error process of confirming whether a continuous rolling mode or a discontinuous rolling mode should be used, is required.
  • a method of confirming a state of a rolled steel sheet discharged after a process is executed in a continuous rolling mode is used.
  • An aspect of the present disclosure may provide a continuous casting and rolling method, selecting mode switching between a continuous rolling mode and a discontinuous rolling mode and producing a rolled steel sheet product in which quality is secured.
  • a continuous casting and rolling method includes: a casting operation of producing a slab in a caster; a rolling operation of rolling the slab using a roughing mill located at an outlet of the caster and a finishing mill located at an outlet of the roughing mill; and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the casting operation and the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • the continuous rolling mode is performed when the following equation is satisfied, and the discontinuous rolling mode is selected and performed when the following equation is not satisfied.
  • HV > L T 2295 ⁇ 1 153 N R ⁇ 2 459 N F ⁇ 17 4074 t ⁇ 2 ⁇ 50 153
  • H is the numerical value of a slab thickness in mm at the outlet of the caster
  • V is the numerical value of a slab speed in m/min at the outlet of the caster
  • L is the numerical value of a length in m from the outlet of the caster to an outlet of the finishing mill
  • T is the numerical value of an average temperature in °C of the slab at the outlet of the caster
  • N R is a stand number of the roughing mill
  • N F is a stand number of the finishing mill
  • t is the numerical value of a slab thickness in mm at an outlet of the finishing mill.
  • a continuous casting and rolling method includes: a casting operation of producing a slab in a caster; a rolling operation of rolling the slab using a roughing mill located at an outlet of the caster and a finishing mill located at an outlet of the roughing mill; a heating operation of heating the slab using a heater located at an inlet of at least one of the roughing mill and the finishing mill; a scale removing operation of removing scale on a surface of the slab by a first scale remover located at an inlet of the roughing mill and a second scale remover located at an inlet of the finishing mill; and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the casting operation and the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • the continuous rolling mode and the discontinuous rolling mode are selected and performed, based on a slab thickness at the outlet of the caster, a slab width at the outlet of the caster, a slab speed at the outlet of the caster, a length from an outlet of a caster to an outlet of a finishing mill, calories received by the slab, an average temperature of a slab at an outlet of a caster, a stand number of the roughing mill, a stand number of the finishing mill, a pressure input to the first scale remover, a pressure input to the second scale remover, and a slab thickness at an outlet of the finishing mill.
  • the continuous rolling mode is performed when the following equation is satisfied, and the discontinuous rolling mode may be selected and performed when the following equation is not satisfied.
  • H is the numerical value of a slab thickness in mm at the outlet of the caster
  • W is the numerical value of a slab width in mm at the outlet of the caster
  • V is the numerical value of a slab speed in m/min at the outlet of the caster
  • L is the numerical value of a length in m from the outlet of the caster to an outlet of the finishing mill
  • E H is the numerical value of power supplied to the heater for heating the slab inMW received by the slab
  • T is the numerical value of an average temperature in °C of the slab at the outlet of the caster
  • N R is a stand number of the roughing mill
  • N F is a stand number of the finishing mill
  • P R is the numerical value of pressure input to the first scale remover in bar
  • P F is the numerical value of a pressure input to the second scale remover in bar
  • t is the numerical value of a slab thickness in mm at an outlet of the finishing mill.
  • the stand number of the roughing mill (N R ) is 0 to 3
  • the stand number (N F ) of the finishing mill is 5 to 7
  • the pressure (P R ) input to the first scale remover is 0 to 200 bar
  • the pressure (P F ) input to the second scale remover is 200 to 300 bar
  • the thickness (t) of the slab at an outlet of the finishing mill is 1. 0 to 3.0 mm
  • the continuous rolling mode may be performed when the following equation is satisfied, and the discontinuous rolling mode may be selected and performed when the following equation is not satisfied.
  • A is 0.3553 to 0.4247.
  • the continuous rolling mode may be performed when the following equation is satisfied, and the discontinuous rolling mode may be selected and performed when the following equation is not satisfied.
  • A is 0.3553 to 0.4247
  • B is 39020 to 97550.
  • the continuous rolling mode may be performed when the following equation is satisfied, and the discontinuous rolling mode may be selected and performed when the following equation is not satisfied.
  • C 0.0315 to 0.1404.
  • a continuous casting and rolling apparatus includes: a caster producing a slab; a rolling mill including a roughing mill located at an outlet of the caster and a finishing mill located at an outlet of the roughing mill, and rolling the slab; a cutter located by at least one of an inlet of the roughing mill or an inlet of the finishing mill; and a controller electrically connected to the cutter and adjusting driving of the cutter, determining whether to perform mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the caster and the rolling mill, and a discontinuous rolling mode in which the slab is cut by the cutter, and selecting the continuous rolling mode or the discontinuous rolling mode.
  • the controller selects the continuous rolling mode, the following equation is satisfied. HV > L T 2295 ⁇ 1 153 N R ⁇ 2 459 N F ⁇ 17 4074 t ⁇ 2 ⁇ 50 153
  • H is the numerical value of a slab thickness in mm at the outlet of the caster
  • V is the numerical value of a slab speed in m/min at the outlet of the caster
  • L is the numerical value of a length in m from the outlet of the caster to an outlet of the finishing mill
  • T is the numerical value of an average temperature in °C of the slab at the outlet of the caster
  • N R is a stand number of the roughing mill
  • N F is a stand number of the finishing mill
  • t is the numerical value of a slab thickness in mm at an outlet of the finishing mill.
  • the continuous casting and rolling apparatus may further include: a heater located at an inlet of at least one of the roughing mill or the finishing mill.
  • a heater located at an inlet of at least one of the roughing mill or the finishing mill.
  • W is the numerical value of a slab width in mm at the outlet of the caster
  • E H is the numerical value of power supplied to the heater for heating the slab in MW received by the slab.
  • the continuous casting and rolling apparatus may further include: a scale remover including a first scale remover located at an inlet of the roughing mill and a second scale remover located at an inlet of the finishing mill.
  • a scale remover including a first scale remover located at an inlet of the roughing mill and a second scale remover located at an inlet of the finishing mill.
  • P R is the numerical value of a pressure in bar input to the first scale remover
  • P F is the numerical value of a pressure in bar input to the second scale remover
  • a continuous casting and rolling method includes: a casting operation of producing a slab in a caster; a rolling operation of rolling the slab by a rolling mill; and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the casting operation and the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • the continuous rolling mode is performed when a temperature at an outlet of the rolling mill is equal to or greater than a temperature at which the slab is able to be provided in an austenitic state, and the discontinuous rolling mode is selected and performed when the temperature at an outlet of the rolling mill is lower than the temperature at which the slab is able to be provided in an austenitic state.
  • a continuous casting and rolling apparatus and a continuous casting and rolling method may have an effect of securing a quality of a rolled steel sheet product when mode switching between a continuous rolling mode and a discontinuous rolling mode is selected.
  • a continuous casting and rolling method relate to an invention for selecting mode switching between a continuous rolling mode and a discontinuous rolling mode.
  • a continuous casting and rolling method are an invention for securing a quality of a product of a rolled steel sheet product when mode switching between a continuous rolling mode and a discontinuous rolling mode is selected.
  • a continuous casting and rolling apparatus may include a caster 10 producing a slab, a rollingmill 20 having a roughing mill 21 located at an outlet of the caster 10 and a finishing mill 22 located at an outlet of the roughing mill 21, and rolling the slab, a cutter 30 located in at least one of an inlet of the roughing mill 21 or an inlet of the finishing mill 22, and a controller 60 electrically connected to the cutter 30 and adjusting driving of the cutter 30, determining whether to perform mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the caster 10 and the rolling mill 20, and a discontinuous rolling mode in which the slab is cut by the cutter 30, and selecting the continuous rolling mode or the discontinuous rolling mode.
  • Equation 1 may be satisfied.
  • H is the numerical value of a slab thickness in mm at an outlet of the caster 10
  • V is the numerical value of a slab speed in m/min at an outlet of the caster 10
  • L is the numerical value of a length in m from an outlet of the caster 10 to an outlet of a finishing mill 22
  • T is the numerical value of an average temperature in °C of a slab at an outlet of the caster 10
  • N R is a stand number of a roughing mill
  • N F is a stand number of the finishing mill
  • t is the numerical value of a slab thickness in mm at an outlet of the finishing mill 22.
  • a temperature at an outlet of the finishing mill 22 is equal to or greater than a temperature at which a slab or a final rolled steel sheet able to be provided to be in an austenitic state.
  • quality of a rolled steel sheet having been produced may be secured.
  • the following equations are also proposed for the same reason.
  • the caster 10 may serve to produce a slab from molten steel through a casting process.
  • the caster 10 provides molten steel from a tundish to a mold, the molten steel having been provided forms a slab while calories are removed, and the slab is guided by a segment roll and a pinch roll and is moved and provided to a rolling mill 20, which will be described later.
  • a production speed is limited in terms of being adjusted.
  • a speed may be limited.
  • the rolling mill 20 may serve to produce a rolled steel sheet by receiving the slab, produced in the caster 10, and rolling the slab. To this end, the rolling mill 20 may allow the slab to pass between a pair of rolling rolls to be rolled, and may include a rolling stand in which the pair of rolling rolls are provided.
  • the rolling mill 20 may include a roughing mill 21 performing rolling to obtain an intermediate thickness before a final rolled steel sheet product in which a slab, provided from the caster 10, is rolled to obtain a final thickness, and a finishing mill 22 producing a rolled steel sheet having a final thickness again using the slab, rolled to obtain the intermediate thickness in the roughing mill 21.
  • the roughing mill 21 is located at an outlet of the caster 10 and performs a rolling operation by receiving the slab produced by the caster 10
  • the finishing mill 22 is located at an outlet of the roughing mill 21 and performs a rolling operation for producing a final rolled steel sheet product by receiving the slab, in which the rolling operation is performed in the roughing mill 21, and performing rolling.
  • the number of rolling stands provided to the roughing mill 21 and the finishing mill 22 may be adjusted according to characteristics of a material of the rolled steel sheet, having been produced, and the like, the number of rolling stands, secured by the roughing mill 21 or the finishing mill 22 in the entirety of equipment, is not the number of rolling stands, provided by the roughing mill 21 or the finishing mill 22, and the number of rolling stands, actually used for driving, among the number of rolling stands, having been secured, is the number of rolling stands provided by the roughing mill 21 or the finishing mill 22.
  • the cutter 30 may be provided to cut the slab in a middle portion of the continuous casting and rolling apparatus, in order to perform a discontinuous rolling mode.
  • the cutter 30 may be located at an inlet of the roughing mill 21 or an inlet of the finishing mill 22, and, in detail, may be provided in at least one of a position between the roughing mill 21 and the caster 10 or a position between the finishing mill 22 and the roughing mill 21.
  • the cutter 30 may be additionally provided at an outlet of the finishing mill 22, in order to discharge a final rolled steel sheet product, completed by rolling the slab.
  • the cutter 30 is electrically connected to a controller 60, which will be described later, thereby adjusting cutting of the slab.
  • the controller 60 selects a continuous rolling mode or a discontinuous rolling mode to be performed.
  • a discontinuous rolling mode is performed.
  • the controller 60 does not instruct an operation of the cutter 30, the slab is provided as a continuous body from the caster 10 to the rolling mill 20, so a continuous rolling mode is performed.
  • Equation 1 when the controller 60 does not allow the cutter 30 to be driven and a continuous rolling mode is selected and performed, Equation 1 should be satisfied.
  • Equation 1 when Equation 1 is not satisfied and a continuous rolling mode is performed, a rolled steel sheet product, having been finally produced, is produced as a defective product, so the rolled steel sheet product may not be used and may be discarded.
  • a continuous casting and rolling apparatus may further include a heater 40, a scale remover 50, and the like, thereby performing a continuous casting and rolling process.
  • the continuous casting and rolling apparatus may further include the heater 40 located at an inlet of at least one of the roughing mill 21 or the finishing mill 22.
  • Equation 2 is satisfied. HWV > WL ⁇ 3902 E H T 2295 ⁇ 1 153 N R ⁇ 2 459 N F ⁇ 17 4074 t ⁇ 2 ⁇ 50 153
  • W is the numerical value of a slab width in mm at an outlet of the caster 10
  • E H is the numerical value of power supplied to the heater for heating the slab in MW received by the slab.
  • the heater 40 is provided to perform rolling by increasing a temperature to a temperature required for rolling by performing heating, when a temperature due to heat included in a slab transferred from the caster 10 is insufficient to perform rolling using the rolling mill 20.
  • the heater 40 may be provided to have a form in which a burner is provided in a heating furnace, but is preferably provided in a form for induction heating in which heating is performed by an induction coil in order to easily control a heating temperature.
  • the heater 40 is preferably provided at an inlet of the roughing mill 21 or the finishing mill 22, and in detail may be installed in at least one of a position between the cutter 30 and the roughing mill 21 or a position between the roughing mill 21 and the finishing mill 22.
  • Equation 2 when a continuous casting and rolling apparatus, including the heater 40, is performed in a continuous rolling mode, Equation 2 should be satisfied.
  • a rolled steel sheet product, having been finally produced, is prevented from being produced as a defective product to not be used and to be discarded.
  • the continuous casting and rolling apparatus may further include a scale remover 50 having a first scale remover 51 located at an inlet of the roughing mill 21 and a second scale remover 52 located at an inlet of the finishing mill 22.
  • a scale remover 50 having a first scale remover 51 located at an inlet of the roughing mill 21 and a second scale remover 52 located at an inlet of the finishing mill 22.
  • P R is the numerical value of a pressure in bar input to the first scale remover 51
  • P F is the numerical value of a pressure in bar input to the second scale remover 52.
  • the scale remover 50 serves to remove a foreign substance on a surface of the slab. To this end, the scale remover 50 preferably performs scale removal before the slab enters the roughing mill 21 or the finishing mill 22.
  • the scale remover 50 may provide the first scale remover 51 at an inlet of the roughing mill 21 and the second scale remover 52 at an inlet of the finishing mill 22.
  • Equation 3 when a continuous casting and rolling apparatus, including the heater 40, is performed in a continuous rolling mode, Equation 3 should be satisfied.
  • a rolled steel sheet product, having been finally produced, is prevented from being produced as a defective product to not be used and to be discarded.
  • Equation 3 is satisfied as "520000 > 513974". Under the above conditions, even when a continuous rolling mode is performed, a quality of a required rolled steel sheet may be secured.
  • a continuous casting and rolling method may include a casting operation of producing a slab in the caster 10, a rolling operation of rolling the slab using the rolling mill 20, and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • the continuous rolling mode is performed when a temperature at an outlet of the rolling mill 20 is equal to or greater than a temperature at which the slab is able to be provided in an austenitic state, and the discontinuous rolling mode is selected and performed when a temperature of the rolling mill 20 is lower than the temperature at which the slab is able to be provided in an austenitic state.
  • the casting operation an operation in which a slab is produced by the caster 10, molten steel is received by continuous casting and a slab is provided.
  • the slab, produced at the beginning of the casting operation is provided to the rolling mill 20 to perform a rolling operation.
  • the rolling operation is an operation of producing a product of a rolled steel sheet by receiving the slab produced in the casting operation and rolling the slab.
  • the rolling operation may be divided into a rough rolling operation and a finish rolling operation by the roughing mill 21 and the finishing mill 22 to be performed.
  • the rolling operation may be divided into a rough rolling operation of performing rolling to obtain an intermediate thickness, as an intermediate operation of a final rolled steel sheet thickness in a roughing mill 21 provided in an outlet of the caster 10, and a finish rolling operation of performing rolling to obtain a thickness of the final rolled steel sheet in a finishing mill 22 provided in an outlet of the roughing mill 21.
  • the mode selection operation is an operation of selecting the continuous rolling mode and the discontinuous rolling mode, and the mode selection operation is determined according to a slab temperature at an outlet of the rolling mill 20 to be performed.
  • a continuous rolling mode is performed.
  • a temperature of a slab discharged to an outlet of the finishing mill 22 is less than a temperature at which the slab is able to be provided in an austenitic state.
  • dividing of the continuous rolling mode and the discontinuous rolling mode is defined by whether to perform a rolling operation using a slab having been cut, so the mode selection operation should be performed before the rolling operation.
  • the mode selection operation is preferably performed before the rough rolling operation or the finish rolling operation.
  • the mode selection operation may be performed before the casting operation.
  • a continuous casting and rolling method may include a casting operation producing a slab in a caster 10, a rolling operation of rolling the slab using a roughing mill 21 located at an outlet of the caster 10 and a finishing mill 22 located at an outlet of the roughing mill 21, and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the casting operation and the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • a continuous rolling mode is performed when Equation 4 is satisfied, and a discontinuous rolling mode is selected and performed when the following equation is not satisfied.
  • HV > L T 2295 ⁇ 1 153 N R ⁇ 2 459 N F ⁇ 17 4074 t ⁇ 2 ⁇ 50 153
  • H is the numerical value of a slab thickness in mm at an outlet of the caster 10
  • V is the numerical value of a slab speed in m/min at an outlet of the caster 10
  • L is the numerical value of a length in m from an outlet of the caster 10 to an outlet of a finishing mill 22
  • T is the numerical value of an average temperature in °C of a slab at an outlet of the caster 10
  • N R is a stand number of the roughing mill
  • N F is a stand number of the finishing mill
  • t is the numerical value of a thickness in mm of a slab at an outlet of the finishing mill 22.
  • a continuous rolling mode and a discontinuous rolling mode may be selected and performed based on Equation 4.
  • Equation 4 is a condition only satisfied when a heating operation and a scale removal operation, which will be described later, are not included.
  • Equation 5 When the heating operation and the scale removal operation are included, whether to perform mode switching should be determined by Equation 5, which will be described later.
  • a continuous casting and rolling method may include a casting operation of producing a slab in a caster 10, a rolling operation of rolling the slab using a roughing mill 21 located at an outlet of the caster 10 and a finishing mill 22 located at an outlet of the roughing mill 21, a heating operation of heating the slab using a heater 40 located at an inlet of at least one of the roughing mill 21 or the finishing mill 22, a scale removing operation of removing scale on a surface of the slab by a first scale remover 51 located at an inlet of the roughing mill 21 and a second scale remover 52 located at an inlet of the finishing mill 22, and a mode selection operation of selecting mode switching between a continuous rolling mode in which the slab is provided as a continuous body in the casting operation and the rolling operation, and a discontinuous rolling mode in which the slab is cut before the rolling operation or during the rolling operation, before the rolling operation.
  • the heating operation may be performed before the rolling operation or during the rolling operation.
  • the heating operation may be performed before a rough rolling operation of the rolling operation or between a rough rolling operation and a finish rolling operation.
  • the heater 40 described previously is provided at an inlet of the roughing mill 21 or at an inlet of the finishing mill 22 and performs heating with respect to the slab.
  • H is the numerical value of a slab thickness in mm at an outlet of a caster
  • W is the numerical value of a slab width in mm at an outlet of the caster
  • V is the numerical value of a slab speed in m/min at an outlet of the caster
  • L is the numerical value of a length in m from an outlet of the caster 10 to an outlet of a finishing mill
  • E H is the numerical value of power supplied to the heater for heating the slab in MW received by the slab
  • T is the numerical value of an average temperature in °C of a slab at an outlet of the caster 10
  • N R is a stand number of a roughing mill
  • N F is a stand number of a finishing mill
  • P R is the numerical value of a pressure in bar input to a first scale remover 51
  • P F is the numerical value of a pressure in bar input to a second scale remover 52
  • t is the numerical value of a slab thickness in mm at an outlet of the finishing mill 22.
  • Equation 5 an effect of air cooling in an entire section, an effect of heating in a heater 40, an effect of rolling in a roughing mill 21 and a finishing mill 22, and an effect of a scale removal process in a first scale remover 51 and a second scale remover 52 may be considered.
  • an effect of heating in a heater 40 is an effect caused by heating by a calorie input to the slab in the heater 40.
  • a representative variable considering the effect described above is E H .
  • an effect by a scale removal process in a first scale remover 51 and a second scale remover 52 is caused by a phenomenon in which cooling is performed by pressure applied by a scale remover 50.
  • pressure provided by the scale remover 50 is increased, the capability to remove scale is improved, but an amount of energy which a slab loses is increased.
  • the effect described above is an effect in which a temperature of the slab is decreased. Representative variables considering the effect described above are P R and P F .
  • the stand number (N R ) of the roughing mill 21 is 0 to 3
  • the stand number (N F ) of the finishing mill 22 is 5 to 7
  • a pressure (P R ) input to the first scale remover 51 is 0 to 200 bar
  • a pressure (P F ) input to the second scale remover 52 is 200 to 300 bar
  • a thickness (t) of a slab at an outlet of the finishing mill 22 is 1.0 to 3.0 mm.
  • A is 0.3553 to 0.4247.
  • calories (E H ) received by the slab are 10 to 25 MW.
  • a continuous rolling mode is performed when Equation 7 is satisfied, a discontinuous rolling mode is selected and performed when the following equation is not satisfied.
  • an average temperature (T) at an outlet of the caster 10 is 1000 to 1250°C
  • the stand number (N R ) of the roughing mill 21 is 3
  • the stand number (N F ) of the finishing mill 22 is 5
  • a pressure (P R ) input to the first scale remover 51 is 200 bar
  • a pressure (P F ) input to the second scale remover 52 is 300 bar
  • a slab thickness (t) at an outlet of the finishing mill 22 is 1.5 mm.
  • C 0.0315 to 0.1404.
  • Equation 6 through Equation 8 equations in which a non-critical variable, among variables of Equation 5, is substituted with a commonly used value, are proposed to more concisely determine the mode selection operation in a general environment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Claims (5)

  1. Verfahren zum kontinuierlichen Gießen und Walzen, umfassend:
    einen Gießvorgang, der darin besteht, eine Bramme in einer Gießvorrichtung herzustellen;
    einen Walzvorgang, der darin besteht, die Bramme unter Verwendung eines Vorwalzwerks, das sich an einem Ausgang der Gießvorrichtung befindet und eines Fertigbearbeitungswerks, das sich an einem Ausgang des Vorwalzwerks befindet, zu walzen; und
    einen Betriebsartauswahlvorgang, der darin besteht, eine Betriebsartumschaltung zwischen einer kontinuierlichen Walzbetriebsart, bei der die Bramme als kontinuierlicher Körper in dem Gießvorgang und dem Walzvorgang bereitgestellt wird, und einer diskontinuierlichen Walzbetriebsart, bei der die Bramme vor dem Walzvorgang oder während des Walzvorgangs zerschnitten wird, vor dem Walzvorgang auszuwählen,
    wobei im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart erfolgt, wenn die folgende Gleichung erfüllt wird, und die diskontinuierliche Walzbetriebsart ausgewählt wird und erfolgt, wenn die folgende Gleichung nicht erfüllt wird, HV > L T 2295 − 1 153 N R − 2 459 N F − 17 4074 t − 2 − 50 153 ,
    Figure imgb0022
    worin H der numerische Wert einer Brammendicke in mm am Ausgang der Gießvorrichtung ist, V der numerische Wert einer Brammengeschwindigkeit in m/min am Ausgang der Gießvorrichtung ist, L der numerische Wert einer Strecke in m von einem Ausgang der Gießvorrichtung zu einem Ausgang des Fertigbearbeitungswerks ist, T der numerische Wert einer mittleren Temperatur in ° C der Bramme am Ausgang der Gießvorrichtung ist, NR eine Gerüstzahl des Vorwalzwerks ist, NF eine Gerüstzahl des Fertigbearbeitungswerks ist, und t der numerische Wert einer Brammendicke in mm an einem Ausgang des Fertigbearbeitungswerks ist.
  2. Verfahren zum kontinuierlichen Gießen und Walzen, umfassend:
    einen Gießvorgang, der darin besteht, eine Bramme in einer Gießvorrichtung herzustellen;
    einen Walzvorgang, der darin besteht, die Bramme unter Verwendung eines Vorwalzwerks, das sich an einem Ausgang der Gießvorrichtung befindet und eines Fertigbearbeitungswerks, das sich an einem Ausgang des Vorwalzwerks befindet, zu walzen;
    einen Erwärmungsvorgang, der darin besteht, die Bramme unter Verwendung einer Erwärmungsvorrichtung zu erwärmen, die an einem Eingang der Vorwalzwerks und/oder des Fertigbearbeitungswerks angeordnet ist;
    einen Zunderbeseitigungsvorgang, der darin besteht, auf einer Oberfläche der Bramme befindlichen Zunder durch eine erste Zunderbeseitigungsvorrichtung, die an einem Eingang des Vorwalzwerks angeordnet ist, und eine zweite Zunderbeseitigungsvorrichtung, die an einem Eingang des Fertigbearbeitungswerks angeordnet ist, zu entfernen; und
    einen Betriebsartauswahlvorgang, der darin besteht, eine Betriebsartumschaltung zwischen einer kontinuierlichen Walzbetriebsart, bei der die Bramme als kontinuierlicher Körper in dem Gießvorgang und dem Walzvorgang bereitgestellt wird, und einer diskontinuierlichen Walzbetriebsart, bei der die Bramme vor dem Walzvorgang oder während des Walzvorgangs zerschnitten wird, vor dem Walzvorgang auszuwählen,
    wobei im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart und die diskontinuierliche Walzbetriebsart auf Grundlage einer Brammendicke am Ausgang der Gießvorrichtung, einer Brammenbreite am Ausgang der Gießvorrichtung, einer Brammengeschwindigkeit am Ausgang der Gießvorrichtung, einer Strecke von einem Ausgang einer Gießvorrichtung zu einem Ausgang eines Fertigbearbeitungswerks, von der Bramme aufgenommenen Wärmemenge, einer mittleren Temperatur einer Bramme an einem Ausgang einer Gießvorrichtung, einer Gerüstzahl des Vorwalzwerks, einer Gerüstzahl des Fertigbearbeitungswerks, eines in die erste Zunderbeseitigungsvorrichtung eingebrachten Drucks, eines in die zweite Zunderbeseitigungsvorrichtung eingebrachten Drucks, und einer Brammendicke an einem Ausgang des Fertigbearbeitungswerks ausgewählt werden und erfolgen, wobei im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart erfolgt, wenn die folgende Gleichung erfüllt wird, und die diskontinuierliche Walzbetriebsart ausgewählt wird und erfolgt, wenn die folgende Gleichung nicht erfüllt wird, HWV > WL − 3902 E H T 2295 − 1 153 N R − 2 459 N F − P R 9180 − P F 18360 − 17 4074 t − 2 − 50 153 ,
    Figure imgb0023
    worin H der numerische Wert einer Brammendicke in mm am Ausgang der Gießvorrichtung ist, W der numerische Wert einer Brammenbreite in mm am Ausgang der Gießvorrichtung ist, V der numerische Wert einer Brammengeschwindigkeit in m/min am Ausgang der Gießvorrichtung ist, L der numerische Wert einer Strecke in m von einem Ausgang der Gießvorrichtung zu einem Ausgang des Fertigbearbeitungswerks ist, EH der numerische Wert einer der Erwärmungsvorrichtung zum Erwärmen der Bramme zugeführten Energie in von der Bramme aufgenommenen MW ist, T der numerische Wert einer mittleren Temperatur in ° C der Bramme am Ausgang der Gießvorrichtung ist, NR eine Gerüstzahl des Vorwalzwerks ist, NF eine Gerüstzahl des Fertigbearbeitungswerks ist, PR der numerische Wert eines in die erste Zunderbeseitigungsvorrichtung eingebrachten Drucks in bar ist, PF der numerische Wert eines in die zweite Zunderbeseitigungsvorrichtung eingebrachten Drucks in bar ist, und t der numerische Wert einer Brammendicke in mm an einem Ausgang des Fertigbearbeitungswerks ist.
  3. Verfahren zum kontinuierlichen Gießen und Walzen nach Anspruch 2, wobei, wenn die Gerüstzahl NR des Vorwalzwerks 0 bis 3 ist, die Gerüstzahl des Fertigbearbeitungswerks 5 bis 7 ist, der in die erste Zunderbeseitigungsvorrichtung eingebrachte Druck (PR) 0 bis 200 bar beträgt, der in die zweite Zunderbeseitigungsvorrichtung eingebrachte Druck (PF) 200 bis 300 bar beträgt, und die Dicke (t) der Bramme an einem Ausgang des Fertigbearbeitungswerks 1,0 bis 3,0 mm beträgt,
    im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart erfolgt, wenn die folgende Gleichung erfüllt wird, und die diskontinuierliche Walzbetriebsart ausgewählt wird und erfolgt, wenn die folgende Gleichung nicht erfüllt wird, HWV > WL − 3902 E H T 2295 − A ,
    Figure imgb0024
     worin A 0,3553 bis 0,4247 ist.
  4. Verfahren zum kontinuierlichen Gießen und Walzen nach Anspruch 3, wobei, wenn es sich bei der von der Bramme aufgenommenen Wärmemenge (EH) um 10 bis 25 MW handelt,
    im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart erfolgt, wenn die folgende Gleichung erfüllt wird, und die diskontinuierliche Walzbetriebsart ausgewählt wird und erfolgt, wenn die folgende Gleichung nicht erfüllt wird, HWV > WL − B T 2295 − A ,
    Figure imgb0025
     worin A 0,3553 bis 0,4247 und B 39020 bis 97550 ist.
  5. Verfahren zum kontinuierlichen Gießen und Walzen nach Anspruch 2, wobei, wenn die mittlere Temperatur (T) an Ausgang der Gießvorrichtung 1000 bis 1250° C beträgt, die Gerüstzahl (NR) des Vorwalzwerks 3 ist, die Gerüstzahl (NF) des Fertigbearbeitungswerks 5 ist, der in die erste Zunderbeseitigungsvorrichtung eingebrachte Druck (PR) 200 bar beträgt, der in die zweite Zunderbeseitigungsvorrichtung eingebrachte Druck (PF) 300 bar beträgt, und die Dicke (t) der Bramme an einem Ausgang des Fertigbearbeitungswerks 1,5 mm beträgt,
    im Betriebsartauswahlvorgang die kontinuierliche Walzbetriebsart erfolgt, wenn die folgende Gleichung erfüllt wird, und die diskontinuierliche Walzbetriebsart ausgewählt wird und erfolgt, wenn die folgende Gleichung nicht erfüllt wird, HWV > WL − 3902 E H C ,
    Figure imgb0026
     worin C 0,0315 bis 0,1404 ist.
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DE102019207459A1 (de) * 2018-05-23 2019-11-28 Sms Group Gmbh Gieß-Walzanlage für den Batch- und Endlosbetrieb
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