US20160101464A1 - Method and apparatus for producing steel intermediate products - Google Patents
Method and apparatus for producing steel intermediate products Download PDFInfo
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- US20160101464A1 US20160101464A1 US14/879,443 US201514879443A US2016101464A1 US 20160101464 A1 US20160101464 A1 US 20160101464A1 US 201514879443 A US201514879443 A US 201514879443A US 2016101464 A1 US2016101464 A1 US 2016101464A1
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- bloom
- rolling mill
- strands
- cantilever
- rollers
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000013067 intermediate product Substances 0.000 title claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 130
- 238000009749 continuous casting Methods 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims description 19
- 230000007246 mechanism Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 19
- 239000000047 product Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
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- 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
- 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
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/12—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process axes being arranged in different planes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/22—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories for rolling metal immediately subsequent to continuous casting, i.e. in-line rolling of steel
-
- 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
- B21B37/46—Roll speed or drive motor control
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- 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
- B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening 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
- B22D11/14—Plants for continuous casting
- B22D11/142—Plants for continuous casting for curved 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/04—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing in a continuous process
-
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/005—Cantilevered roll stands
-
- 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
- B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/022—Blooms or billets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B2013/006—Multiple strand rolling mills; Mill stands with multiple caliber rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/06—Cassettes
-
- 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
- B21B2261/10—Cross-sectional area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/07—Adaptation of roll neck bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/02—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills
- B21B35/04—Drives for metal-rolling mills, e.g. hydraulic drives for continuously-operating mills each stand having its own motor or motors
Definitions
- the present invention relates generally to methods and apparatuses for producing steel intermediate products.
- the present disclosure relates to methods and apparatuses for in-line rolling of billets from continuously cast blooms.
- Rolling mills are installed for producing finished steel products, for example, for local markets in developing world countries and near markets for finished steel products, such as mild steel bar for use in civil construction.
- these rolling mills will typically rely on importing steel billets from other countries that have a larger steelmaking capacity, to finish for their local markets. This is prevalent in many developing world countries because even local production of steel intermediate products from recycled steel is not possible due to the scarcity of steel scrap generated locally, and the difficulties with providing a reliable and cost-effective supply of electrical power to operate an electric arc furnace. Therefore, imported billets are ‘re-rolled’ to produce the finished steel products.
- re-rolling mills typically take a starting billet size of up to 150 mm by 150 mm square (225 square centimetres) and are typically much smaller and have fewer production capabilities in terms of variety of input and output products, and production rate, compared to larger, dedicated rolling mills.
- the continuously casted billets are of much larger cross section than is capable of being rolled by a ‘re-rolling’ mill.
- continuous casting machines producing “bloom” strands having a cross section of greater than 150 mm by 150 mm square, and up to 400 mm by 400 mm square (typically 240 mm by 240 mm square or in the case of a tube continuous casting machine, 250 mm round) are now commonplace at the larger steel producing facilities. These blooms are larger than the typical maximum size billet of 150 mm by 150 mm square that can be rolled by the re-rolling mills described above.
- the present disclosure provides a method of continuously producing steel intermediate products.
- the method includes casting liquid steel into plural moulds to continuously produce plural bloom strands; and feeding one or more of the bloom strands in-line to respective rolling mills configured to be selectively engageable to hot roll the input continuously cast bloom strands to produce rolled billets, wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
- excess steel bloom production by a large capacity continuous steel casting machine can be directly converted to billets by an in-line hot rolling process, without the need for additional heating or reheating of the blooms before rolling.
- there is no need for a separate billet rolling mill to produce re-rollable billets from the continuously cast blooms and as a result, this additional investment, double handling, extra manning, heating and rolling losses that would result from rolling reheated bloom lengths and which would make such billet production uneconomical, is avoided.
- large capacity multi-strand continuous casting machines are enabled to efficiently directly produce re-rollable billets by an in-line rolling process at the same time as producing larger blooms.
- large capacity steel intermediate production facilities can export surplus production for use in re-rolling mills in countries that rely on importing steel billets.
- the cast bloom strands fed in-line to the rolling mills are still hot from the continuous casting, and wherein no additional reheating of the blooms is performed between the casting and hot rolling.
- the bloom strands have a cross sectional area above 230 square centimetres, and preferably the rolled billets have a cross sectional area below 230 square centimetres. Blooms typically are dimensioned above 150 mm square (and up to 400 mm square), the rolled billets typically are dimensioned below 150 mm square.
- the method further comprises: feeding the bloom strands through respective straightening rollers; operating each rolling mill at a speed based on a reference speed of the straightening rollers of the particular bloom strand fed to that rolling mill.
- Using the speed of the individual straightening rollers for each continuously cast strand as a reference speed for the rolling speed of the rolling mill for that strand in this way enables the billets to be reliably hot rolled and the material flow balance to be maintained on a strand-by-strand basis.
- cantilevered rolling mill stands allows the rolling of each bloom strand to not interfere with the adjacent strand of the multi-strand bloom casting machine, and it allows the length of the rolling mill across all stands to be kept low and to be positioned as close as possible to the exit of the strands from the continuous casting machine, enabling the blooms to be rolled while still hot from the casting process, and before they have cooled.
- Conventional rolling mills in which the rollers are “simply supported” with bearing supports at both ends of the rolling axis, would be too large to fit between the adjacent strands on exit from the continuous casting machine, and so would only be usable to roll the cast blooms if the strands were spaced further apart on exit from the continuous casting machine or moved further apart somehow by rollers. This is simply not practical.
- the drive mechanism and motor for each cantilever rolling mill stand is arranged outside the outermost strands produced by the continuous casting. In this way the bulky drive mechanism and motor components will not occupy space immediately above or below the bloom strands, such that the cast blooms are not interfered with.
- the drive mechanism and/or motor for the or each cantilever rolling mill stand is connected to the respective cantilever rolling mill stand by respective long shafts arranged so as to distance the drive mechanism and/or motor from the hot blooms.
- each of the rolls for a given cantilever rolling mill stand is driven by an individual motor.
- the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other. Arranging the cantilevered rolling mill stands in this way allows the rollers to access the bloom strands from away to the sides of the bloom, reducing the extent to which the rollers and the rolling mill housing interfere with the space immediately surrounding the cast blooms. Further, by alternating the axes of the rollers in this way, the rolling mill housings and stands can be offset from each other and/or positioned alternately above and below the cast blooms allowing the rollers to be positioned close to each other axially along the strand, allowing the rolling mill to occupy a short length along the strand such that the cast strand can be rolled at a uniform temperature without significant cooling between the rolling mill stands.
- each rolling mill comprises at least two, or preferably at least four, in-line cantilever rolling mill stands arranged to roll increasingly small billet sizes.
- each rolling mill stand will work on two faces of the bloom (for example, if the bloom is a 240 mm by 240 mm square cross section bloom) and the next rolling mill stand will work on the opposite two faces, rolling the cast blooms into smaller size billets.
- the cantilever stands may be moved out of the line of the bloom casting without interrupting the casting process.
- the rolls of cantilever stands are separated from each another to at least a distance wide enough for the rolling mill stands to clear the bloom and be moved out of the bloom casting line.
- the housing for the bearing supports for each cantilever rolling mill stand is configured as a replaceable cassette, for example, that interfaces with the motor and drive mechanism. This will facilitate a quick changing of the rolls, for example when the rolls become worn, reducing downtime.
- the rolling mill and each rolling mill stand is selectably operable or engageable with the cast blooms, allowing the bloom strands to be selectably hot rolled into billets optionally of varying sizes.
- This allows the output of the continuous casting machine to be selectably variable in size, allowing production to adapt readily to demand, for example, fluctuations in demand in domestic and/or export markets for cast blooms and (rolled) billets.
- protective cooling or insulating jackets are provided around the housing for the bearing supports and/or the motor and/or drive mechanism for each cantilever rolling mill stand.
- only one or both of the outermost strands of the plurality of continuously cast bloom strands is hot rolled into a billet.
- the degree to which the rolling mill interferes with the space around the cast bloom strands, and the degree to which the steel mill needs to be re-engineered to accommodate the rolling mill is minimized.
- the requirements for the rolling mill stands are less stringent as the space requirements for rolling only the outermost strand(s) (due to the space availability to the sides of the strands) are less than those required for the innermost strands.
- the present disclosure provides apparatus for continuously producing steel intermediate products.
- the apparatus comprises a continuous casting apparatus arranged to, in use, continuously produce plural bloom strands; and one or more in-line rolling mills each arranged to be selectively engageable to receive and hot roll, in use, one of the continuously cast bloom strands to produce rolled billets, wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
- the continuous casting apparatus comprises a tundish arranged to collect liquid steel and provide said liquid steel to plural moulds arranged side by side to continuously produce plural bloom strands.
- the continuous casting apparatus is configured to operate in the methods in accordance with the embodiments described above.
- FIG. 1 illustrates an apparatus and method of operation thereof for in-line rolling of billets from continuously cast blooms in accordance with an embodiment of aspects of the present disclosure.
- a continuous casting machine 110 comprises a ladle 112 , tundish 114 , multiple permanent moulds 116 for forming strands 118 and straightening rollers 120 for straightening the strands.
- Molten steel is tapped into the ladle 112 from one or more furnaces (not shown).
- the ladle 112 has at its bottom a pipe opening which is arranged above and drains liquid steel into a holding bath or tundish 114 .
- the tundish 114 acts as a buffer reservoir and has shrouds or pipe openings into the permanent moulds 116 .
- the liquid steel drains from the tundish 114 into the permanent moulds 116 which are shaped and liquid cooled to form a solidified exterior casing for the strands 118 that are formed by the hardened steel dropping due to gravity from the open bottom of the permanent moulds 116 .
- each of the continuously cast strands 118 is then passed through sequences of pairs of individual straightening rollers that guide the strands to extend in a horizontal direction and straighten the strands as they move along between the rollers and cool and further solidify.
- the continuous casting machine 110 and the permanent moulds 116 in particular are configured such that the strands 118 are formed as blooms having a cross sectional area above 230 square centimetres, in this case 240 mm by 240 mm square.
- the continuous casting machine 110 has a high production capacity of, say 2 million tonnes a year, with a production speed of at least 4 metres per minute, and can operate continuously for a number of years of production between servicing.
- this production capacity of continuously cast blooms exceeds demand, for example in the domestic market, which would lead to an increase in inventory of cast blooms
- the apparatus 100 operates to hot roll one or more of the bloom strands 118 into billets 140 by operation of the in-line rolling mills 150 , which can for example be exported to developing world markets for direct use in re-rolling mills.
- the rolled billets are formed to have a cross sectional area below 230 square centimetres, in this case 150 mm by 150 mm square.
- the apparatus 100 is arranged such that the cast bloom strands 118 fed in-line to the rolling mills 140 in use are still hot from the continuous casting. No apparatus is provided arranged to perform additional reheating of the blooms between the casting and hot rolling.
- the in-line rolling mills 150 comprise a plurality of cantilever rolling mill stands 152 in which the bearing supports for the rollers 154 of each stand support the rollers at only one end.
- the drive mechanism and motor 156 for each cantilever rolling mill stand 152 is arranged outside the outermost strands 118 produced by the continuous casting.
- the drive mechanism and/or motor 156 for the cantilever rolling mill stands 152 can be connected to the respective cantilever rolling mill stand 152 by respective long shafts arranged so as to distance the drive mechanism and/or motor 156 from the hot blooms 118 .
- protective cooling or insulating jackets can be provided around the housing 158 for the bearing supports and/or the motor and/or drive mechanism 156 for each cantilever rolling mill stand 152 .
- Motors may be arranged to individually drive each of the rollers 154 for a given cantilever rolling mill stand 152 .
- the second cantilevered rolling mill stand 152 of each rolling mill is drawn with the drive mechanism and motor 156 and the housing 158 below the strands 118 at floor level.
- the rolling mills 150 can be arranged such that the drive mechanism and motor 156 and the housing 158 of the cantilevered rolling mill stands 152 are never positioned underneath the strands 118 by, for example, positioning certain components above floor level.
- the housing 158 for the bearing supports for each cantilever rolling mill stand 152 is configured as a replaceable cassette, for facilitating a quick changing of the rolls, e.g. when worn, reducing down time.
- Each rolling mill 150 (for each strand) comprises two in-line cantilever rolling mill stands 152 .
- cantilever rolling mill stands are provided, arranged to roll increasingly small billet sizes.
- the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom.
- the angle of the axes of the subsequent rolling mill stands is set at 90 degrees, or about 90 degrees, to each other.
- Each rolling mill 150 is configured to operate at a speed based on a reference speed of the straightening rollers of the particular bloom strand 118 fed to that rolling mill. This ensures a balance to the flow of material through the rolling mills 150 .
- both of the outermost strands of the plurality of continuously cast bloom strands 118 is hot rolled into a billet.
- the in-line rolling mills 150 are in position and operate continuously such that rolled billets are always produced.
- the rolling mills 150 can be selectively engaged such that billet production can be responsive to variation in demand for cast bloomed and rolled billets for re-rolling. Therefore the cantilever stands may be moved out of the line of the bloom casting without interrupting the casting process.
- the rollers 154 of the cantilever stands are separated from each another to at least a distance wide enough for the rolling mill stands 150 to clear the bloom and be moved out of the bloom casting line.
- the disclosure is applicable not just to square blooms, but also to round blooms for which appropriate permanent moulds and straightening rollers need to be provided.
- the roll pass section then needs to be adjusted accordingly to produce billets of the desired square (or other) cross section.
- the strands are cast in a process of sequence continuous casting.
- This process enables different temperatures of liquid steel to be continuous-continuously casted, i.e. without interruption. This process increases productivity by eliminating the need to prepare for starting a new individual casting process each time.
- adjustable cantilevered rolling mill stands the present disclosure allows for the blooms width to be adjusted and liquid steel of different temperatures to be cast continuously. Steel of different temperatures may be utilised by replacing the tundish comprising the steel of a different temperature.
Abstract
Methods and apparatuses for continuously producing steel intermediate products are disclosed. Liquid steel is cast into plural moulds to continuously produce plural bloom strands using continuous casting apparatus. Subsequently, one or more of the bloom strands is fed in-line to respective rolling mills configured to hot roll the input continuously cast bloom strands to produce rolled billets.
Description
- This application claims priority to, and the benefit of, GB patent application no. GB1417999.8, filed Oct. 10, 2014, and GB patent application no. GB1517278.6, filed Sep. 30, 2015. The text of each of these applications is incorporated herein in its entirety.
- The present invention relates generally to methods and apparatuses for producing steel intermediate products. In particular, the present disclosure relates to methods and apparatuses for in-line rolling of billets from continuously cast blooms.
- Rolling mills are installed for producing finished steel products, for example, for local markets in developing world countries and near markets for finished steel products, such as mild steel bar for use in civil construction. In countries where there is no significant production of semi-finished (cast) steel products, these rolling mills will typically rely on importing steel billets from other countries that have a larger steelmaking capacity, to finish for their local markets. This is prevalent in many developing world countries because even local production of steel intermediate products from recycled steel is not possible due to the scarcity of steel scrap generated locally, and the difficulties with providing a reliable and cost-effective supply of electrical power to operate an electric arc furnace. Therefore, imported billets are ‘re-rolled’ to produce the finished steel products. These ‘re-rolling mills’ typically take a starting billet size of up to 150 mm by 150 mm square (225 square centimetres) and are typically much smaller and have fewer production capabilities in terms of variety of input and output products, and production rate, compared to larger, dedicated rolling mills.
- In the 1960s, production of billets was achieve by rolling cast ingots, each weighing 10 tons or more and such ingots were rolled into billets in a separate billet rolling mill. This antiquated method had no problem with rolling the ingots into the 150 mm needed for the re-rolling mills described above. However, such a billet production method resulted in high end losses and has additional rolling costs, and so it was not particularly effective or efficient.
- Since the 1970s, the “Continuous Casting” process has completely replaced the old ingots casting practice for producing intermediate steel products, and so now square or round billets are typically directly casted from liquid steel using a “Continuous Casting Machine”, rather than being rolled from cast ingots.
- With today's very large capacity steel mills, producing, say, over 2 million tons of steel products annually, the continuously casted billets are of much larger cross section than is capable of being rolled by a ‘re-rolling’ mill. For example, continuous casting machines producing “bloom” strands having a cross section of greater than 150 mm by 150 mm square, and up to 400 mm by 400 mm square (typically 240 mm by 240 mm square or in the case of a tube continuous casting machine, 250 mm round) are now commonplace at the larger steel producing facilities. These blooms are larger than the typical maximum size billet of 150 mm by 150 mm square that can be rolled by the re-rolling mills described above.
- It is in this context that the present disclosure is devised.
- Viewed from one aspect, the present disclosure provides a method of continuously producing steel intermediate products. The method includes casting liquid steel into plural moulds to continuously produce plural bloom strands; and feeding one or more of the bloom strands in-line to respective rolling mills configured to be selectively engageable to hot roll the input continuously cast bloom strands to produce rolled billets, wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
- In accordance with the present disclosure, excess steel bloom production by a large capacity continuous steel casting machine can be directly converted to billets by an in-line hot rolling process, without the need for additional heating or reheating of the blooms before rolling. In this way, there is no need for a separate billet rolling mill to produce re-rollable billets from the continuously cast blooms, and as a result, this additional investment, double handling, extra manning, heating and rolling losses that would result from rolling reheated bloom lengths and which would make such billet production uneconomical, is avoided. In this way, large capacity multi-strand continuous casting machines are enabled to efficiently directly produce re-rollable billets by an in-line rolling process at the same time as producing larger blooms. By enabling, preferably selectable, production of readily-exportable billets directly from continuously cast bloom strands, large capacity steel intermediate production facilities can export surplus production for use in re-rolling mills in countries that rely on importing steel billets.
- In embodiments, the cast bloom strands fed in-line to the rolling mills are still hot from the continuous casting, and wherein no additional reheating of the blooms is performed between the casting and hot rolling.
- Preferably, the bloom strands have a cross sectional area above 230 square centimetres, and preferably the rolled billets have a cross sectional area below 230 square centimetres. Blooms typically are dimensioned above 150 mm square (and up to 400 mm square), the rolled billets typically are dimensioned below 150 mm square.
- In embodiments the method further comprises: feeding the bloom strands through respective straightening rollers; operating each rolling mill at a speed based on a reference speed of the straightening rollers of the particular bloom strand fed to that rolling mill. Using the speed of the individual straightening rollers for each continuously cast strand as a reference speed for the rolling speed of the rolling mill for that strand in this way enables the billets to be reliably hot rolled and the material flow balance to be maintained on a strand-by-strand basis.
- The use of cantilevered rolling mill stands allows the rolling of each bloom strand to not interfere with the adjacent strand of the multi-strand bloom casting machine, and it allows the length of the rolling mill across all stands to be kept low and to be positioned as close as possible to the exit of the strands from the continuous casting machine, enabling the blooms to be rolled while still hot from the casting process, and before they have cooled. Conventional rolling mills, in which the rollers are “simply supported” with bearing supports at both ends of the rolling axis, would be too large to fit between the adjacent strands on exit from the continuous casting machine, and so would only be usable to roll the cast blooms if the strands were spaced further apart on exit from the continuous casting machine or moved further apart somehow by rollers. This is simply not practical.
- In embodiments the drive mechanism and motor for each cantilever rolling mill stand is arranged outside the outermost strands produced by the continuous casting. In this way the bulky drive mechanism and motor components will not occupy space immediately above or below the bloom strands, such that the cast blooms are not interfered with.
- In embodiments the drive mechanism and/or motor for the or each cantilever rolling mill stand is connected to the respective cantilever rolling mill stand by respective long shafts arranged so as to distance the drive mechanism and/or motor from the hot blooms. This enables the drive equipment and motors to be operated away from the high temperature environment immediately surrounding the cast blooms, improving their lifetime and reliability, and allowing conventional motors and mechanisms to be used that are not required to be designed to withstand extreme environments and temperatures.
- In embodiments each of the rolls for a given cantilever rolling mill stand is driven by an individual motor.
- In embodiments the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other. Arranging the cantilevered rolling mill stands in this way allows the rollers to access the bloom strands from away to the sides of the bloom, reducing the extent to which the rollers and the rolling mill housing interfere with the space immediately surrounding the cast blooms. Further, by alternating the axes of the rollers in this way, the rolling mill housings and stands can be offset from each other and/or positioned alternately above and below the cast blooms allowing the rollers to be positioned close to each other axially along the strand, allowing the rolling mill to occupy a short length along the strand such that the cast strand can be rolled at a uniform temperature without significant cooling between the rolling mill stands. In embodiments each rolling mill comprises at least two, or preferably at least four, in-line cantilever rolling mill stands arranged to roll increasingly small billet sizes. In embodiments, each rolling mill stand will work on two faces of the bloom (for example, if the bloom is a 240 mm by 240 mm square cross section bloom) and the next rolling mill stand will work on the opposite two faces, rolling the cast blooms into smaller size billets.
- In embodiments, it may not be desirable to further roll the bloom strands. Therefore the cantilever stands may be moved out of the line of the bloom casting without interrupting the casting process. The rolls of cantilever stands are separated from each another to at least a distance wide enough for the rolling mill stands to clear the bloom and be moved out of the bloom casting line.
- In embodiments the housing for the bearing supports for each cantilever rolling mill stand is configured as a replaceable cassette, for example, that interfaces with the motor and drive mechanism. This will facilitate a quick changing of the rolls, for example when the rolls become worn, reducing downtime.
- In embodiments, the rolling mill and each rolling mill stand is selectably operable or engageable with the cast blooms, allowing the bloom strands to be selectably hot rolled into billets optionally of varying sizes. This allows the output of the continuous casting machine to be selectably variable in size, allowing production to adapt readily to demand, for example, fluctuations in demand in domestic and/or export markets for cast blooms and (rolled) billets.
- In embodiments protective cooling or insulating jackets are provided around the housing for the bearing supports and/or the motor and/or drive mechanism for each cantilever rolling mill stand.
- In embodiments only one or both of the outermost strands of the plurality of continuously cast bloom strands is hot rolled into a billet. By rolling only the outermost strand(s), the degree to which the rolling mill interferes with the space around the cast bloom strands, and the degree to which the steel mill needs to be re-engineered to accommodate the rolling mill is minimized. In addition the requirements for the rolling mill stands are less stringent as the space requirements for rolling only the outermost strand(s) (due to the space availability to the sides of the strands) are less than those required for the innermost strands. In addition, excess production of continuously cast blooms, for example, for the domestic market, can, by operating on the outermost bloom strands, easily be hot rolled in-line into billets in the continuous casting process for direct export, for example, to developing world countries for re-rolling in a billet re-rolling mill.
- Viewed from another aspect, the present disclosure provides apparatus for continuously producing steel intermediate products. The apparatus comprises a continuous casting apparatus arranged to, in use, continuously produce plural bloom strands; and one or more in-line rolling mills each arranged to be selectively engageable to receive and hot roll, in use, one of the continuously cast bloom strands to produce rolled billets, wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
- In embodiments the continuous casting apparatus comprises a tundish arranged to collect liquid steel and provide said liquid steel to plural moulds arranged side by side to continuously produce plural bloom strands.
- In embodiments, the continuous casting apparatus is configured to operate in the methods in accordance with the embodiments described above.
- The disclosure, may best be understood by reference to the following description of certain exemplary embodiments together with the accompanying drawing in which:
-
FIG. 1 illustrates an apparatus and method of operation thereof for in-line rolling of billets from continuously cast blooms in accordance with an embodiment of aspects of the present disclosure. - The detailed description set forth below in connection with the appended drawings is intended as a description of presently preferred embodiments of the disclosure, and is not intended to represent the only forms in which the present disclosure may be practised. It is to be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the disclosure. Furthermore, terms “comprises,” “comprising,” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that apparatuses and method steps that comprises a list of elements or steps does not include only those elements but may include other elements or steps not expressly listed or inherent. An element or step proceeded by “comprises . . . a” does not, without more constraints, preclude the existence of additional identical elements or steps that comprises the element or step.
- Referring now to
FIG. 1 , which shows anapparatus 100 for in-line rolling of billets from continuously cast blooms in accordance with an embodiment of the present disclosure, acontinuous casting machine 110 comprises aladle 112,tundish 114, multiplepermanent moulds 116 for formingstrands 118 and straighteningrollers 120 for straightening the strands. - Molten steel is tapped into the
ladle 112 from one or more furnaces (not shown). Theladle 112 has at its bottom a pipe opening which is arranged above and drains liquid steel into a holding bath ortundish 114. Thetundish 114 acts as a buffer reservoir and has shrouds or pipe openings into thepermanent moulds 116. The liquid steel drains from thetundish 114 into thepermanent moulds 116 which are shaped and liquid cooled to form a solidified exterior casing for thestrands 118 that are formed by the hardened steel dropping due to gravity from the open bottom of thepermanent moulds 116. In this case, fivepermanent moulds 116 are provided, but the number of permanent moulds could be greater or fewer than this, but is preferably at least two, and even more preferably greater than two or an even higher number in order to give a high production capacity. Each of the continuously caststrands 118 is then passed through sequences of pairs of individual straightening rollers that guide the strands to extend in a horizontal direction and straighten the strands as they move along between the rollers and cool and further solidify. - The
continuous casting machine 110, and thepermanent moulds 116 in particular are configured such that thestrands 118 are formed as blooms having a cross sectional area above 230 square centimetres, in this case 240 mm by 240 mm square. - The
continuous casting machine 110 has a high production capacity of, say 2 million tonnes a year, with a production speed of at least 4 metres per minute, and can operate continuously for a number of years of production between servicing. When this production capacity of continuously cast blooms exceeds demand, for example in the domestic market, which would lead to an increase in inventory of cast blooms, in accordance with the present disclosure, theapparatus 100 operates to hot roll one or more of thebloom strands 118 into billets 140 by operation of the in-line rolling mills 150, which can for example be exported to developing world markets for direct use in re-rolling mills. The rolled billets are formed to have a cross sectional area below 230 square centimetres, in thiscase 150 mm by 150 mm square. - The
apparatus 100 is arranged such that thecast bloom strands 118 fed in-line to the rolling mills 140 in use are still hot from the continuous casting. No apparatus is provided arranged to perform additional reheating of the blooms between the casting and hot rolling. - The in-
line rolling mills 150 comprise a plurality of cantilever rolling mill stands 152 in which the bearing supports for therollers 154 of each stand support the rollers at only one end. The drive mechanism andmotor 156 for each cantilever rollingmill stand 152 is arranged outside theoutermost strands 118 produced by the continuous casting. In embodiments different to that shown inFIG. 1 , the drive mechanism and/ormotor 156 for the cantilever rolling mill stands 152 can be connected to the respective cantilever rolling mill stand 152 by respective long shafts arranged so as to distance the drive mechanism and/ormotor 156 from thehot blooms 118. To further reduce heating effects, in other embodiments protective cooling or insulating jackets can be provided around thehousing 158 for the bearing supports and/or the motor and/or drivemechanism 156 for each cantilever rollingmill stand 152. Motors may be arranged to individually drive each of therollers 154 for a given cantilever rollingmill stand 152. - For clarity's sake, in
FIG. 1 , the second cantilevered rolling mill stand 152 of each rolling mill is drawn with the drive mechanism andmotor 156 and thehousing 158 below thestrands 118 at floor level. However, in other embodiments, to avoid mill scale build up on the machinery, the rollingmills 150 can be arranged such that the drive mechanism andmotor 156 and thehousing 158 of the cantilevered rolling mill stands 152 are never positioned underneath thestrands 118 by, for example, positioning certain components above floor level. - The
housing 158 for the bearing supports for each cantilever rollingmill stand 152 is configured as a replaceable cassette, for facilitating a quick changing of the rolls, e.g. when worn, reducing down time. - Each rolling mill 150 (for each strand) comprises two in-line cantilever rolling mill stands 152. In other embodiments, more than two or preferably at least four, cantilever rolling mill stands are provided, arranged to roll increasingly small billet sizes. The angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom. The angle of the axes of the subsequent rolling mill stands is set at 90 degrees, or about 90 degrees, to each other.
- Each rolling
mill 150 is configured to operate at a speed based on a reference speed of the straightening rollers of theparticular bloom strand 118 fed to that rolling mill. This ensures a balance to the flow of material through the rollingmills 150. - As shown in
FIG. 1 , both of the outermost strands of the plurality of continuously castbloom strands 118 is hot rolled into a billet. The in-line rolling mills 150 are in position and operate continuously such that rolled billets are always produced. The rollingmills 150 can be selectively engaged such that billet production can be responsive to variation in demand for cast bloomed and rolled billets for re-rolling. Therefore the cantilever stands may be moved out of the line of the bloom casting without interrupting the casting process. Therollers 154 of the cantilever stands are separated from each another to at least a distance wide enough for the rolling mill stands 150 to clear the bloom and be moved out of the bloom casting line. - The disclosure is applicable not just to square blooms, but also to round blooms for which appropriate permanent moulds and straightening rollers need to be provided. The roll pass section then needs to be adjusted accordingly to produce billets of the desired square (or other) cross section.
- In a further embodiment of the present disclosure, the strands are cast in a process of sequence continuous casting. This process enables different temperatures of liquid steel to be continuous-continuously casted, i.e. without interruption. This process increases productivity by eliminating the need to prepare for starting a new individual casting process each time. Through the use of adjustable cantilevered rolling mill stands the present disclosure allows for the blooms width to be adjusted and liquid steel of different temperatures to be cast continuously. Steel of different temperatures may be utilised by replacing the tundish comprising the steel of a different temperature.
- The description of the preferred embodiments of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or to limit the disclosure to the forms disclosed. It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the broad inventive concept thereof. It is understood, therefore, that this disclosure is not limited to the particular embodiment disclosed, but covers modifications within the scope of the present disclosure as defined by the appended claims.
Claims (26)
1. A method of continuously producing steel intermediate products, comprising:
casting liquid steel into plural moulds to continuously produce plural bloom strands; and
feeding one or more of the bloom strands in-line to respective rolling mills configured to be selectively engageable to hot roll the input continuously cast bloom strands to produce rolled billets,
wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
2. A method as claimed in claim 1 , wherein the cast bloom strands fed in-line to the rolling mills are still hot from the continuous casting, and wherein no additional reheating of the blooms is performed between the casting and hot rolling.
3. A method as claimed in claim 1 , wherein the bloom strands have a cross sectional area above 230 square centimetres, and wherein the rolled billets have a cross sectional area below 230 square centimetres.
4. A method as claimed in claim 1 , further comprising:
feeding the bloom strands through respective straightening rollers; and
operating each rolling mill at a speed based on a reference speed of the straightening rollers of the particular bloom strand fed to that rolling mill.
5. A method as claimed in claim 1 , wherein a drive mechanism and a motor for each cantilever rolling mill stand is arranged outside the outermost strands produced by the continuous casting.
6. A method as claimed in claim 1 , wherein each of the rolls for a given cantilever rolling mill stand is driven by an individual motor.
7. A method as claimed in claim 1 , wherein each rolling mill comprises at least two, or preferably at least four, in-line cantilever rolling mill stands arranged to roll increasingly small billet sizes.
8. A method as claimed in claim 1 , wherein a housing for the bearing supports for each cantilever rolling mill stand is configured as a replaceable cassette.
9. A method as claimed in claim 1 , wherein protective cooling or insulating jackets are provided around a housing for the bearing supports and/or a motor and/or a drive mechanism for each cantilever rolling mill stand.
10. A method as claimed in claim 1 , wherein only one or both of the outermost strands of the plurality of continuously cast bloom strands is hot rolled into a billet, and wherein at least one innermost bloom strand is provided.
11. A method as claimed in claim 1 , wherein the plural bloom strands are cast in a process of sequence continuous casting.
12. A method as claimed in claim 1 , wherein the rollers of the cantilever rolling mill stands are separated from each another to at least a distance wide enough for the cantilever rolling mill stands to clear the bloom and be moved out of the bloom casting line.
13. Apparatus for continuously producing steel intermediate products, comprising:
continuous casting apparatus arranged to, in use, continuously produce plural bloom strands; and
one or more in-line rolling mills each arranged to be selectively engageable to receive and hot roll, in use, one of the continuously cast bloom strands to produce rolled billets,
wherein the rolling mills comprise two or more cantilever rolling mill stands in which bearing supports for the rollers of each stand support the rollers at only one end, and wherein the angle of the axes of the rollers of the first cantilever rolling mill stand for a given bloom is set at 45 degrees to the top surface of the bloom and wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
14. Apparatus as claimed in claim 13 , wherein the apparatus is arranged such that the cast bloom strands fed in-line to the rolling mills in use are still hot from the continuous casting, and wherein no apparatus is provided arranged to performing additional reheating of the blooms between the casting and hot rolling in use.
15. Apparatus as claimed in claim 13 , wherein continuous casting apparatus comprises a tundish arranged to collect liquid steel and provide said liquid steel to plural moulds arranged side by side to continuously produce plural bloom strands.
16. Apparatus as claimed in claim 13 , wherein the continuous casting apparatus is configured to produce bloom strands having a cross sectional area above 230 square centimetres, and wherein the in-line rolling mills are configured to roll billets having a cross sectional area below 230 square centimetres.
17. Apparatus as claimed in claim 13 , further comprising:
for each bloom strand, respective straightening rollers arranged to receive and straighten the bloom strand;
wherein each rolling mill is configured to operate at a speed based on a reference speed of the straightening rollers of the particular bloom strand fed to that rolling mill.
18. Apparatus as claimed in claim 13 , wherein a drive mechanism and a motor for each cantilever rolling mill stand is arranged outside the outermost strands produced by the continuous casting.
19. Apparatus as claimed in claim 13 , further comprising motors arranged to individually drive each of the rolls for a given cantilever rolling mill stand.
20. Apparatus as claimed in claim 13 , wherein the angle of the axes of the subsequent rolling mill stands is set at 90 degrees to each other.
21. Apparatus as claimed in claim 13 , wherein each rolling mill comprises at least two, or preferably at least four, in-line cantilever rolling mill stands arranged to roll increasingly small billet sizes.
22. Apparatus as claimed in claim 13 , wherein a housing for the bearing supports for each cantilever rolling mill stand is configured as a replaceable cassette.
23. Apparatus as claimed in claim 13 , further comprising protective cooling or insulating jackets provided around a housing for the bearing supports and/or a motor and/or a drive mechanism for each cantilever rolling mill stand.
24. Apparatus as claimed in claim 13 , wherein only one or both of the outermost strands of the plurality of continuously cast bloom strands is hot rolled into a billet, and wherein at least one innermost bloom strand is provided.
25. Apparatus as claimed in claim 13 , wherein the plural bloom strands are cast in a process of sequence continuous casting.
26. Apparatus as claimed in claim 13 , wherein the rollers of the cantilever rolling mill stands are separated from each another to at least a distance wide enough for the cantilever rolling mill stands to clear the bloom and be moved out of the bloom casting line.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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GB1417999.8 | 2014-10-10 | ||
GB1417999.8A GB2531073A (en) | 2014-10-10 | 2014-10-10 | Method and apparatus for producing steel intermediate products |
GB1517278.6 | 2015-09-30 | ||
GB1517278.6A GB2531164B (en) | 2014-10-10 | 2015-09-30 | Method and apparatus for producing steel intermediate products |
Publications (1)
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US20160101464A1 true US20160101464A1 (en) | 2016-04-14 |
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US14/879,443 Abandoned US20160101464A1 (en) | 2014-10-10 | 2015-10-09 | Method and apparatus for producing steel intermediate products |
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US (1) | US20160101464A1 (en) |
EP (1) | EP3006123B1 (en) |
CN (1) | CN105499271B (en) |
ES (1) | ES2637824T3 (en) |
GB (2) | GB2531073A (en) |
HK (1) | HK1220164A1 (en) |
PL (1) | PL3006123T3 (en) |
PT (1) | PT3006123T (en) |
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CN107552750B (en) * | 2017-08-07 | 2023-05-23 | 中冶连铸技术工程有限责任公司 | Multi-stream continuous casting machine capable of producing extra-large section special-shaped blank or plate blank and production method |
CN110039019B (en) * | 2019-04-18 | 2021-06-18 | 河南科技大学 | Multi-path parallel casting and rolling method, casting and rolling system and melt feeding device for casting and rolling |
CN114713631B (en) * | 2022-05-18 | 2024-01-12 | 首钢长治钢铁有限公司 | Rolling production system integration |
Family Cites Families (10)
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GB1288934A (en) * | 1969-05-05 | 1972-09-13 | ||
US3945234A (en) * | 1975-01-02 | 1976-03-23 | Rolf Steinbock | Tandem rolling mill arrangement |
JPS5514134A (en) * | 1978-07-14 | 1980-01-31 | Toshiba Corp | Producing apparatus of steel bar product |
JPS55112105A (en) * | 1979-02-20 | 1980-08-29 | Toshiba Corp | Manufacturing apparatus for steel bar |
DD158312A3 (en) * | 1980-12-11 | 1983-01-12 | Peter Kletzin | INTERNAL AND EXTERNAL TOOLING FOR DRIVING A SPINDLE WHEEL TROLLEY |
ITPN20010012A1 (en) * | 2001-02-15 | 2002-08-16 | Sms Demag Aktiengesellshaft | COMPACT LAMINATION BLOCK FOR TWO PARALLEL LINES. |
ITUD20010098A1 (en) * | 2001-05-25 | 2002-11-25 | Sms Demag Aktiengesellshaft | PERFECTED CONTINUOUS CASTING AND HOT ROLLING PLANT FOR THE DIVERSIFIED PARALLEL PRODUCTION OF BARS OR WIRES |
DE102009050710B4 (en) * | 2009-10-26 | 2016-08-04 | Sms Group Gmbh | Wire rolling stand with single drive |
ES2734851T3 (en) * | 2010-07-26 | 2019-12-12 | Primetals Tech Italy S R L | Apparatus and method for the production of elongated metal products |
CN103480647B (en) * | 2013-09-18 | 2016-03-23 | 陕西钢铁集团有限公司 | A kind of device and production method thereof of producing reinforcing bar without heating low temperature Direct Rolling small billet |
-
2014
- 2014-10-10 GB GB1417999.8A patent/GB2531073A/en not_active Withdrawn
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2015
- 2015-09-30 GB GB1517278.6A patent/GB2531164B/en not_active Expired - Fee Related
- 2015-10-09 PT PT151892478T patent/PT3006123T/en unknown
- 2015-10-09 EP EP15189247.8A patent/EP3006123B1/en not_active Not-in-force
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- 2015-10-12 CN CN201510655041.9A patent/CN105499271B/en not_active Expired - Fee Related
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2016
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EP3006123A1 (en) | 2016-04-13 |
GB201517278D0 (en) | 2015-11-11 |
GB2531073A (en) | 2016-04-13 |
GB201417999D0 (en) | 2014-11-26 |
CN105499271A (en) | 2016-04-20 |
WO2016055813A1 (en) | 2016-04-14 |
ES2637824T3 (en) | 2017-10-17 |
PT3006123T (en) | 2017-08-28 |
PL3006123T3 (en) | 2018-01-31 |
HK1220164A1 (en) | 2017-04-28 |
GB2531164A (en) | 2016-04-13 |
EP3006123B1 (en) | 2017-08-02 |
GB2531164B (en) | 2016-10-12 |
CN105499271B (en) | 2018-04-20 |
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