US20180297092A1 - Endless rolling apparatus and method - Google Patents
Endless rolling apparatus and method Download PDFInfo
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- US20180297092A1 US20180297092A1 US15/768,677 US201615768677A US2018297092A1 US 20180297092 A1 US20180297092 A1 US 20180297092A1 US 201615768677 A US201615768677 A US 201615768677A US 2018297092 A1 US2018297092 A1 US 2018297092A1
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- Prior art keywords
- cooling
- slab
- thickness
- water
- rolling
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- 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
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- 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
- C21D1/84—Controlled slow 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
Definitions
- the present disclosure relates to an endless rolling apparatus and method for manufacturing advanced high strength steel (AHSS).
- AHSS advanced high strength steel
- a cooling speed and an amount of cooling water are set to be different according to a type of produced steel grade (for example, dual-phase (DP) steel, transformation induced plasticity (TRIP) steel, ferritic-bainitic (FB) steel, and the like).
- DP dual-phase
- TRIP transformation induced plasticity
- FB ferritic-bainitic
- An aspect of the present disclosure may provide an endless rolling apparatus and method having improved cooling conditions for production of advanced high strength steel (AHSS).
- AHSS advanced high strength steel
- H is the thickness (mm) of the slab
- V is the casting speed (m/sec) of the slab
- h is product thickness (mm)
- t target arrival time (sec) until entry into the cooling bed.
- an endless rolling method includes: a casting operation of casting a slab using a continuous casting device; a casting speed and thickness measuring operation of measuring a casting speed of the slab produced in the casting operation and a thickness (H) of the slab; a rolling operation of rolling the slab, continuously connected to the continuous casting device, to a target thickness; a product thickness measuring operation of measuring a thickness of a product rolled in the rolling operation; a target arrival time setting operation of setting the target arrival time required for the product to enter a water cooling section of a cooling bed after completion of the rolling operation; and a water cooling start position calculating operation of setting an initial water cooling start position (S) to manufacture advanced high strength steel through at least one water-cooling in the cooling bed using a value obtained in each operation.
- S initial water cooling start position
- H is the thickness (mm) of the slab
- V is the casting speed (m/sec) of the slab
- h is product thickness (mm)
- t target arrival time (sec) until entry into the cooling bed.
- a temperature of the product may be controlled to 750° C. to 880° C.
- FIG. 1 is a view schematically illustrating an endless rolling apparatus.
- the rolling mill 120 may include a rough rolling mill 122 , an intermediate rolling mill 124 , and a finish rolling mill 126 .
- a heating device 130 for heating the slab may be provided between each of the mills included in the rolling mill 120 .
- FIG. 2 a graph illustrating a cooling pattern for the production of general steel, after a product, passing through the finish rolling mill 126 , is air-cooled before the entry into the cooling bed 140 , the product is cooled by water cooling in a process in which the product is supplied to the cooling bed 140 and passes through the water cooling device 142 . Thereafter, the product is controlled to a target coiling temperature through a final air cooling process.
- advanced high strength steel is able to be manufactured using a batch rolling method.
- a product, passing through the finish rolling mill 126 is cooled through primary air cooling before the entry into the cooling bed 140 . Thereafter, the product is cooled through primary water cooling while the product is supplied to the cooling bed 140 and passes through the water cooling device 142 .
- the product, passing through the water cooling device 142 is cooled through secondary air cooling. Thereafter, the product passes through the water cooling device 142 again, and may be cooled through secondary water cooling.
- an initial temperature (FDT) of 820° C. or more may be secured.
- the advanced high strength steel (AHSS) manufactured in the endless rolling apparatus 100 may be manufactured by a cooling pattern as illustrated in FIG. 4 , a graph illustrating a cooling pattern for production of AHSS in endless rolling.
- an initial temperature (FDT), after the steel passes through the finish rolling mill 126 may be controlled to 750° C. to 880° C.
- a product, passing through the finish rolling mill 126 is cooled through primary air cooling before entry into the cooling bed 140 . Thereafter, the product is cooled through primary water cooling while the product is supplied to the cooling bed 140 and passes through the water cooling device 142 .
- the product, passing through the water cooling device 142 is cooled through secondary air cooling.
- cooling may be performed according to a target coiling temperature. Depending on a temperature at which cooling is performed, ferrite, bainite and martensite fractions are controlled for each steel grade, so required steel grade properties (for example, DP steel, TRIP steel, FB steel, and the like) may be obtained.
- continuous casting-rolling processes are directly connected, and a product is continuously supplied.
- a speed of the product is controlled to be relatively slow, so cooling may only be sufficient when at least one high speed cooling and a desired target coiling temperature (CT) of steel may be secured.
- CT target coiling temperature
- AHSS advanced high strength steel
- the water cooling start position (S) may be calculated using uniform mass flow throughout an entire process of an endless rolling process.
- mass flow is uniform throughout an entire process, and the mass flow is calculated using a material cross-section and speed.
- a position in which the water cooling device 142 is installed that is, a water cooling start position (S) is calculated.
- an initial water cooling start position S is defined by Formula 1.
- H is a thickness (mm) of a slab
- V is the casting speed (m/sec) of the slab
- h is product thickness (mm)
- t is the target arrival time (s) until entry into the cooling bed 140 .
- the target arrival time until entry into the cooling bed 140 is greater than 0 seconds, and is limited to being within 10 seconds (sec) to improve productivity.
- a thickness of a product may be obtained through measurement after finish rolling.
- the thickness of the product is 2.0 mm
- the target arrival time until entry into the cooling bed 140 is set to be 4 seconds (sec).
- a casting speed 6.5 m/min
- a conversion factor 1/60 (min/sec), in order to be converted into movement distance per second.
- an endless rolling method of an exemplary embodiment may include a casting operation of casting a slab using a continuous casting device 110 .
- a casting speed of a slab and a thickness (H) of the slab are required to be measured.
- a casting speed and thickness measuring operation of measuring a casting speed of the slab, produced in the casting operation, and the thickness (H) of the slab may be performed.
- a rolling operation of rolling the slab, casted in the casting operation, at a target thickness may be performed.
- a temperature (FDT) of the product may be controlled to 750° C. to 880° C. when the rolling operation is completely.
- a product thickness measuring operation of measuring a thickness of the product, rolled in the rolling operation may be performed.
- the target arrival time required for a product to reach a position of the cooling bed 140 , in which the product enters an initial water cooling device 142 , of at least one water cooling device 142 after the rolling operation is completed, that is, an initial water cooling start position, may be set.
- a cooling start position may be calculated.
- the endless rolling method may be used in the apparatus according to the related art, and the endless rolling method is applied to the apparatus according to the related art using Formula 2 to determine whether the apparatus according to the related art is operated as the endless rolling apparatus 100 of an exemplary embodiment.
- the apparatus according to the related art may be provided with a plurality of water cooling devices 142 in the cooling bed 140 so as to allow cooling-air cooling operations to be performed several times.
- mass flow is uniform in an entire process in the case of endless rolling, so a distance from the finish rolling mill 126 to a water cooling device 142 in which first cooling is performed, and a distance from the finish rolling mill 126 to a water cooling device 142 in which final cooling is performed should be satisfied with Formula 2.
- L 1 is a distance (m) from the finish rolling mill 126 to a first ROT cooling device
- L 2 is a distance (m) from the finish rolling mill 126 to a final ROT cooling device.
- H is a thickness (mm) of a slab
- V is a casting speed (m/s) of the slab
- h is a thickness (mm) of a product
- t is the target arrival time (sec) until the entry into the cooling bed 140 .
- a is a constant of a length of a cooling device required to secure a target coiling temperature (CT).
- a position in which the water cooling device 142 is installed is greater than a distance L 1 from the finish rolling mill 126 to a first ROT cooling device, 10 m.
- a position of the cooling bed 140 , in which initial water cooling, of at least one water-cooling, starts that is, an initial water cooling start position (S), 19.5 m is smaller than 41.6 m, required when a distance L 2 from the finish rolling mill 126 to a final ROT cooling device is 48 m, and a constant of a length of a cooling device required to secure a target coiling temperature (CT), a is 7.4 m.
- S initial water cooling start position
- the endless rolling method of an exemplary embodiment can be applied through the apparatus according to the related art, and advanced high strength steel (AHSS) may be produced by applying the endless rolling method to the apparatus according to the related art.
- AHSS advanced high strength steel
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Abstract
Provided is an endless rolling apparatus and method, which have improved cooling conditions for producing advanced high strength steel. The endless rolling apparatus includes: a continuous casting machine for casting a slab; and a cooling bed having at least one piece of water-cooling equipment and at least one rolling mill continuously connected to the continuous casting machine, wherein, in the cooling bed, an initial position (S) at which the water-cooling equipment is provided so as to manufacture advanced high strength steel through at least one water-cooling is defined by mathematical formula 1. Here, H is the thickness (mm) of a slab, V is the casting speed (m/sec) of the slab, h is the product thickness (mm), and t is the target arrival time (sec) until entry into the cooling bed.
Description
- The present disclosure relates to an endless rolling apparatus and method for manufacturing advanced high strength steel (AHSS).
- Referring to
FIG. 1 , in batch rolling according to the related art, when general steel is manufactured, in order to secure a coiling temperature, after finish rolling is performed, air cooling, water cooling, and air cooling are performed, and a temperature is controlled to a target coiling temperature. - Meanwhile, when advanced high strength steel is manufactured, for cooling using a laminar flow cooling or high density cooling device, in which cooling is performed with cooling water, after finish rolling is performed, operations of air cooling, primary water cooling, air cooling, secondary water cooling, and air cooling are sequentially performed, and a temperature is controlled to a target coiling temperature, so material properties are secured.
- During primary air cooling and secondary air cooling, a cooling speed and an amount of cooling water are set to be different according to a type of produced steel grade (for example, dual-phase (DP) steel, transformation induced plasticity (TRIP) steel, ferritic-bainitic (FB) steel, and the like).
- On the other hand, in an endless rolling apparatus, in which a continuous casting device and a rolling mill are directly connected, according to a continuous casting speed and a slab thickness, a runout table (ROT) passing speed may be different for each final thickness. In detail, in the case of advanced high strength steel (AHSS), a speed at which the steel passes through an endless rolling apparatus is controlled to be slow. In this regard, an ROT cooling method also differs from an endless rolling process according to the related art.
- However, in an endless rolling apparatus and method according to the related art, the water cooling start time required to manufacture AHSS may not be known exactly, so it may be difficult to determine a cooling position.
- An aspect of the present disclosure may provide an endless rolling apparatus and method having improved cooling conditions for production of advanced high strength steel (AHSS).
- According to an aspect of the present disclosure, an endless rolling apparatus includes a continuous casting device casting a slab and a cooling bed having at least one rolling mill and at least one water-cooling device, continuously provided with the continuous casting device. Here, in the cooling bed, an initial position (S), at which the water-cooling device is provided to manufacture advanced high strength steel through at least one water-cooling, is defined by Formula 1,
-
- where H is the thickness (mm) of the slab, V is the casting speed (m/sec) of the slab, h is product thickness (mm), and t is target arrival time (sec) until entry into the cooling bed.
- According to another aspect of the present disclosure, an endless rolling method includes: a casting operation of casting a slab using a continuous casting device; a casting speed and thickness measuring operation of measuring a casting speed of the slab produced in the casting operation and a thickness (H) of the slab; a rolling operation of rolling the slab, continuously connected to the continuous casting device, to a target thickness; a product thickness measuring operation of measuring a thickness of a product rolled in the rolling operation; a target arrival time setting operation of setting the target arrival time required for the product to enter a water cooling section of a cooling bed after completion of the rolling operation; and a water cooling start position calculating operation of setting an initial water cooling start position (S) to manufacture advanced high strength steel through at least one water-cooling in the cooling bed using a value obtained in each operation.
- The water cooling start position calculating operation may be defined by Formula 1,
-
- where H is the thickness (mm) of the slab, V is the casting speed (m/sec) of the slab, h is product thickness (mm), and t is target arrival time (sec) until entry into the cooling bed.
- When the rolling operation is completed, a temperature of the product may be controlled to 750° C. to 880° C.
- According to an exemplary embodiment in the present disclosure, an initial water cooling start position allowing AHSS to be manufactured using at least one water cooling process is determined, so advanced high strength steel (AHSS) may be manufactured while significantly reducing cooling after finish rolling.
-
FIG. 1 is a view schematically illustrating an endless rolling apparatus. -
FIG. 2 is a graph illustrating a cooling pattern for production of general steel. -
FIG. 3 is a graph illustrating a cooling pattern for production of AHSS in batch rolling. -
FIG. 4 is a graph illustrating a cooling pattern for production of AHSS in endless rolling. - Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The exemplary embodiments of the present invention can be modified to have various other forms, and the scope of the present invention is not limited to the exemplary embodiments described below. In the following description, a shape and size of the components in the drawings may be exaggerated for clarity, and components having the same reference numerals illustrated in the drawings are the same components.
-
FIG. 1 is a view schematically illustrating an endless rolling apparatus. - Referring to
FIG. 1 , an endlessrolling apparatus 100 of an exemplary embodiment may perform a casting process of continuously casting a slab while solidifying molten steel in a liquid phase to a solid phase without a defect, and a rolling process of rolling the slab, continuously cast as described above. - Here, in the casting process, a slab product is produced using a
continuous casting device 110. The slab is manufactured as a product having a target thickness while passing through at least one rollingmill 120, continuously connected to the slab. Thereafter, the slab is manufactured as a final product while passing through acooling bed 140 and being wound on awinding apparatus 150. - Preferably, the
rolling mill 120 may include a rough rollingmill 122, an intermediate rollingmill 124, and afinish rolling mill 126. In addition, aheating device 130 for heating the slab may be provided between each of the mills included in therolling mill 120. - Meanwhile, the
cooling bed 140 is divided into an air cooling section in which cooling is performed with air, and a water cooling section in which water cooling is performed with cooling water. The water cooling section may include a water-cooling device spraying cooling water for high speed cooling. For example, the water-cooling device may be awater cooling device 142, known as a high density cooling or laminar flow cooling device and installed in a cooling bed. - Referring to
FIG. 2 , a graph illustrating a cooling pattern for the production of general steel, after a product, passing through thefinish rolling mill 126, is air-cooled before the entry into thecooling bed 140, the product is cooled by water cooling in a process in which the product is supplied to thecooling bed 140 and passes through thewater cooling device 142. Thereafter, the product is controlled to a target coiling temperature through a final air cooling process. - As described above, in general steel, ferrite and pearlite fractions may be controlled through operations of air cooling-water cooling-air cooling.
- Meanwhile, referring to
FIG. 3 , advanced high strength steel (AHSS) is able to be manufactured using a batch rolling method. In this case, a product, passing through thefinish rolling mill 126, is cooled through primary air cooling before the entry into thecooling bed 140. Thereafter, the product is cooled through primary water cooling while the product is supplied to thecooling bed 140 and passes through thewater cooling device 142. In addition, the product, passing through thewater cooling device 142, is cooled through secondary air cooling. Thereafter, the product passes through thewater cooling device 142 again, and may be cooled through secondary water cooling. - As described above, air cooling may be performed again on the product, on which secondary air cooling and secondary water cooling have been performed. In this case, cooling may be performed according to a target coiling temperature. Depending on a temperature at which cooling is performed, ferrite and bainite and martensite fractions are controlled for each steel grade, so required steel grade properties (for example, DP steel, TRIP steel, FB steel, and the like) may be obtained.
- After the advanced high strength steel (AHSS) manufactured using a batch rolling method passes through the
finish rolling mill 126, an initial temperature (FDT) of 820° C. or more may be secured. - Meanwhile, in the exemplary embodiment, the advanced high strength steel (AHSS) manufactured in the endless
rolling apparatus 100 may be manufactured by a cooling pattern as illustrated inFIG. 4 , a graph illustrating a cooling pattern for production of AHSS in endless rolling. - In the endless
rolling apparatus 100, an initial temperature (FDT), after the steel passes through thefinish rolling mill 126, may be controlled to 750° C. to 880° C. - In addition, a product, passing through the
finish rolling mill 126, is cooled through primary air cooling before entry into thecooling bed 140. Thereafter, the product is cooled through primary water cooling while the product is supplied to thecooling bed 140 and passes through thewater cooling device 142. In addition, the product, passing through thewater cooling device 142, is cooled through secondary air cooling. In this case, cooling may be performed according to a target coiling temperature. Depending on a temperature at which cooling is performed, ferrite, bainite and martensite fractions are controlled for each steel grade, so required steel grade properties (for example, DP steel, TRIP steel, FB steel, and the like) may be obtained. - As described above, in the endless
rolling apparatus 100 of an exemplary embodiment, continuous casting-rolling processes are directly connected, and a product is continuously supplied. Thus, a speed of the product is controlled to be relatively slow, so cooling may only be sufficient when at least one high speed cooling and a desired target coiling temperature (CT) of steel may be secured. In this regard, advanced high strength steel (AHSS) may be manufactured. - In this case, in the
endless rolling apparatus 100, in order to obtain a sufficient cooling effect using at least one high speed cooling, an initial position of thecooling bed 140, in which thewater cooling device 142, a water-cooling device, is provided, that is an initial water cooling start position (S) is required to be accurately set. - The water cooling start position (S) may be calculated using uniform mass flow throughout an entire process of an endless rolling process. In other words, in the
endless rolling apparatus 100, mass flow is uniform throughout an entire process, and the mass flow is calculated using a material cross-section and speed. - Moreover, when a thickness of a slab, manufactured in the
continuous casting device 110, a casting speed, a thickness of a product after finish rolling, and a target arrival time until cooling starts are given, a position in which thewater cooling device 142 is installed, that is, a water cooling start position (S), is calculated. - Thus, a position in which an initial
water cooling device 142 is installed, that is, an initial water cooling start position (S) is defined by Formula 1. -
- Here, H is a thickness (mm) of a slab, V is the casting speed (m/sec) of the slab, h is product thickness (mm), and t is the target arrival time (s) until entry into the
cooling bed 140. - Preferably, in an exemplary embodiment, the target arrival time until entry into the
cooling bed 140 is greater than 0 seconds, and is limited to being within 10 seconds (sec) to improve productivity. - For example, when a slab thickness of 90 mm and a casting speed of 6.5 m/min are given, a thickness of a product may be obtained through measurement after finish rolling. In this case, the thickness of the product is 2.0 mm, and the target arrival time until entry into the
cooling bed 140 is set to be 4 seconds (sec). - In this case, a casting speed, 6.5 m/min, may be calculated while being multiplied by a conversion factor, 1/60 (min/sec), in order to be converted into movement distance per second.
- When the conditions described above are input to Formula 1,
-
- is represented. When Formula 1, described above, is calculated, a position in which an initial
water cooling device 142, of at least onewater cooling device 142, is installed, that is, an initial water cooling start position (S), may be calculated as 19.5 m or greater. - Meanwhile, an endless rolling method of an exemplary embodiment may include a casting operation of casting a slab using a
continuous casting device 110. In addition, in order to obtain mass flow of an entire process, a casting speed of a slab and a thickness (H) of the slab are required to be measured. To this end, a casting speed and thickness measuring operation of measuring a casting speed of the slab, produced in the casting operation, and the thickness (H) of the slab may be performed. - Next, a rolling operation of rolling the slab, casted in the casting operation, at a target thickness, may be performed. In this case, a temperature (FDT) of the product may be controlled to 750° C. to 880° C. when the rolling operation is completely.
- Thereafter, a product thickness measuring operation of measuring a thickness of the product, rolled in the rolling operation, may be performed.
- Meanwhile, in a target arrival time setting operation, the target arrival time, required for a product to reach a position of the
cooling bed 140, in which the product enters an initialwater cooling device 142, of at least onewater cooling device 142 after the rolling operation is completed, that is, an initial water cooling start position, may be set. - In addition, through a cooling start position calculating operation of setting an initial water cooling start position using a value obtained in each operation, a cooling start position may be calculated.
- Meanwhile, the endless rolling method may be used in the apparatus according to the related art, and the endless rolling method is applied to the apparatus according to the related art using Formula 2 to determine whether the apparatus according to the related art is operated as the
endless rolling apparatus 100 of an exemplary embodiment. - The apparatus according to the related art may be provided with a plurality of
water cooling devices 142 in thecooling bed 140 so as to allow cooling-air cooling operations to be performed several times. - In this case, mass flow is uniform in an entire process in the case of endless rolling, so a distance from the
finish rolling mill 126 to awater cooling device 142 in which first cooling is performed, and a distance from thefinish rolling mill 126 to awater cooling device 142 in which final cooling is performed should be satisfied with Formula 2. -
- Here, L1 is a distance (m) from the
finish rolling mill 126 to a first ROT cooling device, and L2 is a distance (m) from thefinish rolling mill 126 to a final ROT cooling device. - In addition, H is a thickness (mm) of a slab, V is a casting speed (m/s) of the slab, h is a thickness (mm) of a product, and t is the target arrival time (sec) until the entry into the
cooling bed 140. Moreover, a is a constant of a length of a cooling device required to secure a target coiling temperature (CT). - For example, using Formula 2, it is determined whether the endless rolling method of an exemplary embodiment is applied to the
endless rolling apparatus 100 in which a distance L1 from thefinish rolling mill 126 to a first ROT cooling device is 10 m, and a distance L2 from thefinish rolling mill 126 to a final ROT cooling device is 48 m. - In the endless rolling method of an exemplary embodiment, when a slab thickness is 90 mm, a casting speed is 6.5 m/min, a product thickness is 2.0 mm, and the target arrival time until entry into the
cooling bed 140 is set to be 4 seconds (sec), a position of thecooling bed 140, in which an initialwater cooling device 142, of at least onewater cooling device 142, is installed, that is, an initial water cooling start position (S), is calculated using Formula 1 by unit conversion, so the initial water cooling start position from thefinish rolling mill 126 is 19.5 m. - In this case, a position in which the
water cooling device 142 is installed, that is, a water cooling start position (S), 19.5 m, is greater than a distance L1 from thefinish rolling mill 126 to a first ROT cooling device, 10 m. - Moreover, a position of the
cooling bed 140, in which initial water cooling, of at least one water-cooling, starts, that is, an initial water cooling start position (S), 19.5 m is smaller than 41.6 m, required when a distance L2 from thefinish rolling mill 126 to a final ROT cooling device is 48 m, and a constant of a length of a cooling device required to secure a target coiling temperature (CT), a is 7.4 m. - Thus, the endless rolling method of an exemplary embodiment can be applied through the apparatus according to the related art, and advanced high strength steel (AHSS) may be produced by applying the endless rolling method to the apparatus according to the related art.
- While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope of the present invention as defined by the appended claims.
Claims (5)
1. An endless rolling apparatus comprising a continuous casting device casting a slab and a cooling bed having at least one rolling mill and at least one water-cooling device, continuously provided with the continuous casting device,
wherein, in the cooling bed, an initial position (S), at which the water-cooling device is provided to manufacture advanced high strength steel through at least one water-cooling, is defined by Formula 1,
where H is the thickness (mm) of the slab, V is the casting speed (m/sec) of the slab, h is product thickness (mm), and t is target arrival time (sec) until entry into the cooling bed.
2. An endless rolling method comprising:
a casting operation of casting a slab using a continuous casting device;
a casting speed and thickness measuring operation of measuring a casting speed of the slab produced in the casting operation and a thickness (H) of the slab;
a rolling operation of rolling the slab, continuously connected to the continuous casting device, to a target thickness;
a product thickness measuring operation of measuring a thickness of a product rolled in the rolling operation;
a target arrival time setting operation of setting the target arrival time required for the product to enter a water cooling section of a cooling bed after completion of the rolling operation; and
a water cooling start position calculating operation of setting an initial cooling start position (S) to manufacture advanced high strength steel through at least one water-cooling in the cooling bed using a value obtained in each operation.
3. The endless rolling method of claim 2 , wherein the water cooling start position calculating operation is defined by Formula 1,
where H is the thickness (mm) of the slab, V is the casting speed (m/sec) of the slab, h is product thickness (mm), and t is target arrival time (sec) until entry into the cooling bed.
4. The endless rolling method of claim 2 , wherein, when the rolling operation is completed, a temperature of the product is controlled to 750° C. to 880° C.
5. The endless rolling method of claim 3 , wherein, when the rolling operation is completed, a temperature of the product is controlled to 750° C. to 880° C.
Applications Claiming Priority (3)
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KR1020150146898A KR101755236B1 (en) | 2015-10-21 | 2015-10-21 | Endless rolling apparatus and method |
KR10-2015-0146898 | 2015-10-21 | ||
PCT/KR2016/006854 WO2017069378A1 (en) | 2015-10-21 | 2016-06-27 | Endless rolling device and method |
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US20180297092A1 true US20180297092A1 (en) | 2018-10-18 |
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US15/768,677 Abandoned US20180297092A1 (en) | 2015-10-21 | 2016-06-27 | Endless rolling apparatus and method |
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US (1) | US20180297092A1 (en) |
EP (1) | EP3366380A4 (en) |
JP (1) | JP2018530436A (en) |
KR (1) | KR101755236B1 (en) |
CN (1) | CN108136458B (en) |
WO (1) | WO2017069378A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115041655A (en) * | 2022-07-04 | 2022-09-13 | 重庆钢铁股份有限公司 | Method for preventing casting blank from bending under high temperature |
US11590565B2 (en) * | 2016-10-27 | 2023-02-28 | Novelis Inc. | Metal casting and rolling line |
US11692255B2 (en) | 2016-10-27 | 2023-07-04 | Novelis Inc. | High strength 7XXX series aluminum alloys and methods of making the same |
US11821065B2 (en) | 2016-10-27 | 2023-11-21 | Novelis Inc. | High strength 6XXX series aluminum alloys and methods of making the same |
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DE3637893C2 (en) * | 1986-11-06 | 1996-02-08 | Schloemann Siemag Ag | Process and plant for the production of hot-rolled steel strip and strip casting plant |
JPH0777643B2 (en) * | 1987-01-16 | 1995-08-23 | 住友金属工業株式会社 | Hot continuous finish rolling equipment |
EP0760397B1 (en) * | 1995-04-14 | 2002-08-28 | Nippon Steel Corporation | Equipment for manufacturing stainless steel strip |
US5904204A (en) * | 1995-04-14 | 1999-05-18 | Nippon Steel Corporation | Apparatus for producing strip of stainless steel |
JP2002096108A (en) * | 2000-09-18 | 2002-04-02 | Toshiba Corp | Rolling control method and equipment |
JP3614123B2 (en) * | 2001-09-17 | 2005-01-26 | Jfeスチール株式会社 | Manufacturing method of hot-rolled steel sheet |
CN1757454A (en) * | 2005-09-01 | 2006-04-12 | 赵宗波 | Prodn. process for casting and rolling medium plate |
KR101249128B1 (en) * | 2010-12-28 | 2013-03-29 | 주식회사 포스코 | Continuous rolling apparatus and method thereof |
KR101536460B1 (en) * | 2013-12-23 | 2015-07-13 | 주식회사 포스코 | Apparatus and method for controlling width of bar in endless rolling process |
JP7077643B2 (en) * | 2018-02-06 | 2022-05-31 | 凸版印刷株式会社 | Mouth plugs, and packaging containers with spouts |
-
2015
- 2015-10-21 KR KR1020150146898A patent/KR101755236B1/en active IP Right Grant
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2016
- 2016-06-27 JP JP2018519703A patent/JP2018530436A/en active Pending
- 2016-06-27 CN CN201680061626.0A patent/CN108136458B/en active Active
- 2016-06-27 WO PCT/KR2016/006854 patent/WO2017069378A1/en active Application Filing
- 2016-06-27 US US15/768,677 patent/US20180297092A1/en not_active Abandoned
- 2016-06-27 EP EP16857636.1A patent/EP3366380A4/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11590565B2 (en) * | 2016-10-27 | 2023-02-28 | Novelis Inc. | Metal casting and rolling line |
US11692255B2 (en) | 2016-10-27 | 2023-07-04 | Novelis Inc. | High strength 7XXX series aluminum alloys and methods of making the same |
US11806779B2 (en) | 2016-10-27 | 2023-11-07 | Novelis Inc. | Systems and methods for making thick gauge aluminum alloy articles |
US11821065B2 (en) | 2016-10-27 | 2023-11-21 | Novelis Inc. | High strength 6XXX series aluminum alloys and methods of making the same |
CN115041655A (en) * | 2022-07-04 | 2022-09-13 | 重庆钢铁股份有限公司 | Method for preventing casting blank from bending under high temperature |
Also Published As
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EP3366380A4 (en) | 2018-10-17 |
JP2018530436A (en) | 2018-10-18 |
EP3366380A1 (en) | 2018-08-29 |
WO2017069378A1 (en) | 2017-04-27 |
KR101755236B1 (en) | 2017-07-10 |
WO2017069378A8 (en) | 2017-07-06 |
CN108136458A (en) | 2018-06-08 |
KR20170046871A (en) | 2017-05-04 |
CN108136458B (en) | 2020-05-15 |
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