CN109922904A - Casting-rolling-equipment complex and the finished strip for being continuously manufactured by hot rolling method - Google Patents

Casting-rolling-equipment complex and the finished strip for being continuously manufactured by hot rolling method Download PDF

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Publication number
CN109922904A
CN109922904A CN201780068521.2A CN201780068521A CN109922904A CN 109922904 A CN109922904 A CN 109922904A CN 201780068521 A CN201780068521 A CN 201780068521A CN 109922904 A CN109922904 A CN 109922904A
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CN
China
Prior art keywords
slab
casting
thickness
rolling
sheet billet
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Pending
Application number
CN201780068521.2A
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Chinese (zh)
Inventor
R.温克勒
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Austrian Of Primary Metal Science And Technology LLC
Primetals Technologies Austria GmbH
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Austrian Of Primary Metal Science And Technology LLC
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Filing date
Publication date
Priority to ATA51001/2016A priority Critical patent/AT519277A1/en
Priority to ATA51001/2016 priority
Application filed by Austrian Of Primary Metal Science And Technology LLC filed Critical Austrian Of Primary Metal Science And Technology LLC
Priority to PCT/EP2017/077138 priority patent/WO2018082966A1/en
Publication of CN109922904A publication Critical patent/CN109922904A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/04Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408Moulds for casting thin slabs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/124Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246Nozzles; Spray heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/126Accessories for subsequent treating or working cast stock in situ for cutting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/126Accessories for subsequent treating or working cast stock in situ for cutting
    • B22D11/1265Accessories for subsequent treating or working cast stock in situ for cutting having auxiliary devices for deburring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/128Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282Vertical casting and curving the cast stock to the horizontal
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/14Plants for continuous casting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/18Controlling or regulating processes or operations for pouring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/22Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/46Metal-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
    • B21B1/463Metal-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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B15/00Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007Cutting or shearing the product
    • B21B2015/0014Cutting or shearing the product transversely to the rolling direction
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B15/00Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0057Coiling the rolled product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2201/00Special rolling modes
    • B21B2201/10Endless rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices 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
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04Devices 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 de-scaling, e.g. by brushing
    • B21B45/06Devices 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 de-scaling, e.g. by brushing of strip material

Abstract

The present invention relates to casting-rolling-equipment complex technical fields.It is an object of the invention to, the method for proposing compact casting-rolling-equipment complex and the finished strip (15) for being continuously manufactured by hot rolling in the casting-rolling-equipment complex, thus, it is possible to inexpensively manufacture the finished strip (15) of the steel the most different of high quality.The purpose is achieved by the method for casting-rolling-equipment complex according to claim 1 and the finished strip (15) according to claim 9 for being continuously manufactured by hot rolling by steel.

Description

Casting-rolling-equipment complex and the finished strip for being continuously manufactured by hot rolling Method
Technical field
The present invention relates to casting-rolling-equipment complex technical fields, are such equipment, wherein Casting Equipment (continuous casting for being typically used for being continuously manufactured by steel slab-such as sheet billet or medium-sized slab-with slab specification is set It is standby) directly and online it is connect with the Hot Rolling Mill for manufacturing hot-strip.Hot-strip after Hot Rolling Mill It is cooling in cooling section, and then for example exported and strip being wound into a roll (English: coils).In technological document, These equipment are for example also TSCR(English: Thin Slab Casting and Rolling) or Arvedi ESP equipment.
In particular, the present invention relates to casting-rolling-equipment complexes of continuous operation, in the casting-rolling-equipment complex In, Casting Equipment is configured to sheet billet-continuous casting installation for casting (English: TSER T hin S lab E ndless R olling).Here, The continuous sheet billet slab being continuously manufactured by sheet billet-continuous casting installation for casting is supplied to not shearing directly, online and Hot Rolling Mill, and it is rolled into continuous strip there.The strip is cooling after Hot Rolling Mill and in cooling section, and then the Certain length or certain weight are once cut into, and is wound into a roll.
Background technique
Although Arvedi ESP equipment is significantly more compact compared to CSP the or QSP equipment with car tunnel furnace, And the CO of generated operating cost and hot-strip per ton2Discharge amount has been substantially reduced, and is still existed to for manufacturing annual output There are demands for rolling-equipment complex for the casting-that will also be more compact of hot-strip within the scope of 1000000 tons.
Solution on the market at present, such as continuous casting installation for casting, the Arvedi ESP- of the broad strip mill with postposition are set Standby, Danieli QSP-DUE- equipment or SMS CSP/CEM- equipment, it is not compact enough for this small yield, and/or by It in annual output is about that 1,000,000 ton hours can not be through in about 2,500,000 tons of significantly higher annual outputs and high Capital expenditure CAPEX The operation of Ji ground.Thus especially for for small section steel works, to compact casting-rolling-equipment complex, there are demand, the castings- Rolling-equipment complex is cheap in terms of purchasing and running, and however still can generate the high quality of steel the most different Hot-strip.
By the prior art it is also known that double roller-strip Casting Equipment of the hot-rolling mill with postposition.Although double roller-strip casting Equipment is very compact and directly generates strip, but this technology cannot be implemented so far, because especially cannot be reliably Steel of the alloy to more high alloy in production.
It is a kind of for casting-rolling-design scheme of equipment complex as known to 89/11363 A1 of WO, wherein in continuous casting Sheet billet slab obtained is not clipped just in roughing mill rack by roughing in equipment, subsequent reheating, de-scaling, in finishing mill Finish rolling, cooling and winding are carried out in group.Our experiments show that due to the fact that sheet billet is cast in this design scheme Base thoroughly solidifies in the casting arc of conticaster, and relatively low passage temperature is produced in roughing, this causes for that will cast Structural transformation is that energy needed for rolling structure is higher than necessary energy significantly.In addition, so-called ISP design scheme is also Many problems do not have answer, for example, how to break to dummy bar when being cast according to the continuous casting installation for casting of Fig. 1, to later The problems in environment division how to react, etc..Therefore, the design scheme can only be applied conditionally in the industry.
There are three roughing mill rack and five finishing mills for band as known to 102008003222 A1 of AT 512399 B1 and DE Casting-rolling-equipment complex of rack.2441539 A1 of EP discloses band, and there are four roughing mill rack and five finishing mill machines Casting-rolling-equipment complex of frame.The equipment in three documents being previously mentioned be designed to about 2,500,000 tons and with On annual output.19518144 A1 of DE discloses band, and there are three the so-called miniature of roughing mill rack and five finishing mill racks Hot-rolling mill.But due between roughing mills and mm finishing mill unit induction heating mechanism with compensation furnace be combined, which is configured to Considerably grow.Compared with the prior art, casting-rolling-equipment complex structure length should further decrease, and for manufacturing The Energy input of finished strip should further decrease.
Summary of the invention
It is an object of the present invention to propose compact casting-rolling-equipment complex of type described in introductory song and at this The method that the finished strip of hot rolling is continuously manufactured by casting-rolling-equipment complex can be manufactured inexpensively high-quality whereby Amount the most different steel (low-carbon and middle carbon, but also have HSLA, api class, etc.) finished strip.
The purpose is achieved by casting-rolling-equipment complex according to claim 1.Advantageous embodiment is The theme of dependent claims.
Straight crystallizer, preferably funneling crystallizer (English: funnel mold) combine the subsequent of slab guiding mechanism Vertical section ensures: the possible nonmetallic field trash in steel fusant converges at molten steel face and is cast powder knot It closes.Hence improve the metallurgical quality of sheet billet slab.Pass through the relatively thick and wide sheet billet in the exit of crystallizer On the one hand slab realizes the big quality stream by the equipment, and on the other hand thick by reducing in slab guiding mechanism Degree (such as the pressure of so-called wick-containing) still produces relatively thinner sheet billet slab in continuous casting installation for casting.At least:
Secondary cooling in slab guiding mechanism, and
Casting speed vc,
And the parameter in preferably following inventory:
First cooling in crystallizer,
Thickness in slab guiding mechanism reduces,
It is configured such by the device that controls or regulates of continuous casting installation for casting, so that sheet billet slab is only in slab guiding mechanism Just thoroughly solidification in horizontal section, that is to say, that the horizontal zone that end is located at slab guiding mechanism is wrapped in catchmenting for sheet billet slab Duan Zhong.
Those skilled in the art by controlling or regulating device for example by 01/03867 A1 of WO it is known that controlled or regulated The operation of continuous casting installation for casting, thus even if in continuous casting installation for casting or casting-rolling-equipment complex service condition variation when sheet billet The inside for the horizontal section that top (Sumpfspitze) is also always positioned at slab guiding mechanism is wrapped in catchmenting for slab.Here, phase The disclosure answered, which is quoted, to be added in the application.
This method of operation ensures that sheet billet slab takes away casting heat as much as possible, and in roughing mills and essence Work of deformation and required reheating energy in milling train group is as small as possible.In roughing mills, pass through two roughing mill rack handles The rough rolling strip steel with a thickness of 10 to 30mm is rolled into a thickness of 50 to 70mm sheet billet slab.It is not clipped in continuous operation Ground passes through the pendulum shear for example for cutting dummy bar and the output device for exporting dummy bar.In order not to excessively acutely Ground is cooling to rough rolling strip steel, preferably disposes thermal insulator on the top and bottom of output device.Then, by induction furnace thick The temperature that strip is heated to 1050 to 1250 DEG C is rolled, and passes through descaling device to the top surface and bottom of rough rolling strip steel before finish rolling Face carries out de-scaling.In mm finishing mill unit, by three finishing mill racks rough rolling strip steel be rolled into a thickness of 1.6 to 12mm at Product strip, is then cooled to coiling temperature in cooling section, is sheared for the first time by cutter, and wind in winding device In rolls.
As already mentioned above, straight crystallizer is preferably constructed in funneling crystallizer.The region around molten steel face can be with as a result, The significantly larger cross-sectional area in end with the casting side than crystallizer, so that more field trashes can be absorbed by casting powder.
Beneficial compromise between the structure height and purity of sheet billet slab is, constructs the arc of slab guiding mechanism Section, arc radius R are 3 to 7m, preferably 4 to 6m, particularly preferred 4.5 to 5.5m.
The sub-cooled of the fringe region of sheet billet slab in order to prevent, it is advantageous to which secondary cooling mechanism draws in slab Lead be respectively provided at in-house multiple positions at least two in the width direction of sheet billet slab moveable nozzle.By This is but also the sheet billet slab of different in width will not be subcooled.
Also it is advantageous that thermal insulation in region between the end and roughing mills of the horizontal section of slab guiding mechanism Plate prevents sheet billet slab cooling.
In order to enable because the temperature decline caused by de-scaling keeps as small as possible, it is advantageous to which descaling device is in top surface and bottom Multiple rotary de-scaling devices arranged in the direction of the width are respectively included on face.
For casting-rolling-equipment complex compactedness it is advantageous that the horizontal distance between two finishing mill racks is situated between Between 3 and 6m, particularly between 4 and 5m and/or the length of cooling section is between 20 and 60m, it is preferably between 20 Hes Between 40m.By the small rack spacing of finishing mill rack, the violent cooling of strip is furthermore prevented.
Purpose according to the present invention is equally by according to claim 9 for continuously by the completed belt of steel making hot rolling The method of steel is achieved.Advantageous embodiment is the theme of dependent claims.
In casting according to the present invention-rolling-equipment complex operation, the casting speed v of sheet billet slabc≥4m/ Min, preferably vc>=5m/min, particularly preferred vc≥6m/min.Therefore ensure that high productivity, and convenient for wrapping top catchmenting It is maintained in the horizontal zone of slab guiding mechanism.In addition, reducing the energy for heating rough rolling strip steel in induction furnace.Even The device that controls or regulates of casting machine is at least so set
Secondary cooling in slab guiding mechanism, and
Casting speed vc,
And another parameter in preferably following inventory:
First cooling in crystallizer,
Thickness in slab guiding mechanism reduces,
To the only just thoroughly solidification in the horizontal section of slab guiding mechanism of sheet billet slab.The sheet billet that thickness reduces Slab without de-scaling-that is it not in descaling device, de-scaling-is just supplied to roughing mills, and be rolled into there thick Roll strip.
It is right when controlling or regulating continuous casting installation for casting it is advantageous that controlling or regulating device by means of mathematical model
The physical location on top is wrapped along the catchmenting for transport path of the sheet billet slab in the slab guiding mechanism; With
Along the practical temperature of the transport path of the sheet billet slab in the slab guiding mechanism and its in vertical plane It writes music line,
Carry out Continuous plus, and in view of target temperature profile and it is described catchment the target position for wrapping top in the case where, The sheet billet slab is cooled down with being continuously regulated by the secondary cooling mechanism.Thus it catchments convenient for and wraps top guarantor It holds in the horizontal zone of slab guiding mechanism, and prevents the sub-cooled of slab fringe region.Furthermore, it is possible to by mesh Mark temperature curve avoids the violent cooling of the fringe region of sheet billet slab compared between actual temperature curve.
When thickness reduces advantageously, in the area of the even liquid with sheet billet slab or operative liquid core In domain, soft reduction technique is used by the adjustment device (such as passing through slab guide section) for slab guide reel.Thus subtract Small shape changes function, and again improves metallurgical quality.
By following manner particularly simply and high energy efficiency final rolling temperature is set: in mm finishing mill unit The actual temperature T1 of strip is measured after third rolling pass and before the cooling in cooling sectionIt is practical, and adjusted with temperature The mode of section manipulates multiple inductors of induction furnace, so that actual temperature T1It is practicalIt is equivalent to target temperature as far as possible T1Target
If alternatively measuring strip in mm finishing mill unit after the second rolling pass and before third rolling pass Actual temperature T1*It is practical, and multiple inductors of induction furnace are manipulated in such a way that temperature is regulated, so that Actual temperature T1*It is practicalIt is equivalent to target temperature T1* as far as possibleTarget, then accuracy can be further increased.
In order to set the tissue characteristics of finished strip, it is beneficial to, it carries out measuring continuously after cooling in cooling section The actual temperature T2 of finished stripIt is practical, and multiple cooling nozzles of cooling section are manipulated in such a way that temperature is regulated, thus So that actual temperature T2It is practicalIt is equivalent to target temperature T2 as far as possibleTarget
When manufacturing relatively thin finished strip advantageously, continuous finished strip is high in casting-rolling-equipment complex Mm finishing mill unit is left with first thickness d1 after speed operation, then in continual continuous operation step by step finished strip Thickness is reduced to second thickness d2 < d1, and in continual continuous operation before casting-rolling-equipment complex low speed operation In the thickness of finished strip is increased to 3 > d2 of third thickness d step by step.
Herein it is advantageous that first thickness d1 is between 3 and 12mm, second thickness d2 between 1.6 and 12mm, and And third thickness d 3 is between 3 and 12mm.
Since the high hydrogen content in steel fusant reduces the heat dissipation in crystallizer, so it is advantageous that before continuous casting Such as the hydrogen content of steel is reduced to≤3ppm by being vacuum-treated.
In addition, this measure to sensitive steel, such as can deep-draw steel continuous casting generate wholesome effect.
Detailed description of the invention
Other advantages and features of the present invention are obtained by the explanation to non-limiting embodiment.Show to property illustrated below Attached drawing:
Fig. 1 shows casting-rolling-equipment complex perspective view;
Fig. 2 shows the diagrams of the continuous casting installation for casting of Fig. 1;
Fig. 3 shows the diagram of the different sections of the slab guiding mechanism of the continuous casting installation for casting;
Fig. 4 shows the diagram of the nozzle of multiple adjustable widths in the slab guiding mechanism of continuous casting installation for casting;
Fig. 5 shows temperature when manufacturing the finished strip of thin hot rolling according to the present invention in casting-rolling-equipment complex The diagram of trend;
Fig. 6 shows the finished strip by being used in casting-rolling-equipment complex according to the method for the present invention The diagram of thickness trend.
Specific embodiment
Fig. 1 schematically shows casting-rolling-according to the present invention for the finished strip 15 by steel making hot rolling Equipment complex.Be pretreated by vacuum processing, hydrogen content≤1 ppm liquid steel is transported to continuous casting in steel drum The steel drum capstan head (Far Left in figure) of equipment 1, and be casted by casting distributor be configured to funneling crystallization there In the crystallizer 2 of device.The sheet billet slab 3 for having thin slab casting mold is formed in crystallizer 2, which has 60 To 75mm thickness and 900 to 1700mm width.Partially solidified sheet billet slab 3 is continuously pulled out from crystallizer 2, and It is supported, guides in subsequent slab guiding mechanism 4, and be further cooled by secondary cooling mechanism.Slab vectoring aircraft There is structure 4 vertical section 4a, curved section 4b and horizontal section 4c(to see Fig. 3), the curved section is configured to multiple The thickness of slab guide section reduces device 6.Reduce device 6(by thickness and see Fig. 2) thickness of sheet billet slab 3 is reduced to 50 to 70mm, wherein sheet billet slab has the so-called Liquid Core Reduction(liquid of liquid core 5(when reducing Core pressure)) or operative liquid core.In order to make in roughing mills 8 or mm finishing mill unit 14 in subsequent milling step Mechanical work of deformation keeps as low as possible, and keeps the casting heat in sheet billet slab 3, by the control of continuous casting installation for casting 1 and/ Or regulating device 20 so sets the first cooling in crystallizer 2, the secondary cooling in slab guiding mechanism 4 and casting speed Spend vc, so that the only just thoroughly solidification in the horizontal section 4c of slab guiding mechanism 4 of sheet billet slab 3.According to the present invention, even Casting machine 1 is with the casting speed v of 5.5m/mincIt runs (explanation about casting speed is also shown in Fig. 3).It is that thickness reduces, thorough Sheet billet slab 3 that is solidification, non-de-scaling and not shearing is directly after continuous casting in two roughing mill racks of roughing mills 8 The rough rolling strip steel 9 with a thickness of 10 to 30mm is rolled into R1, R2.In casting according to the present invention-rolling-equipment complex root According to continuous operation of the invention, rough rolling strip steel 9 is used for the casting in continuous casting installation for casting 1 by the pendulum shear 10-pendulum shear Dummy bar-is cut later and passes through output device 11 with not shearing.In order to reduce the cooling of rough rolling strip steel 9, with insulation board pair Output device 11 is usually coated.
Such as by 01/03867 A1 of WO it is known that controlling or regulating the fortune of continuous casting installation for casting by controlling or regulating device 20 Row, so that the inside for the horizontal section 4c that top is located at slab guiding mechanism 4 is wrapped in catchmenting for sheet billet slab 3.Here, corresponding Disclosure quote and be added in the application.
If there is a problem in being placed in the subsequent environment division of output device 11, continuous operation is just abandoned, and lead to It crosses pendulum shear 10 and the material from continuous casting installation for casting 1 or roughing mills 8 is cut into short and small rough rolling strip steel section, and pass through Output device 11 is exported from the roller-way between roughing mills 8 and mm finishing mill unit 14.Here, in the first time of pendulum shear 10 After shearing, the subsequent rough rolling strip steel of pendulum shear 10 will be located at and lifted, to reliably avoid in the material from roughing mills 8 Expect and collides between the subsequent rough rolling strip steel 9 of pendulum shear 10.
If necessary, the temperature of rough rolling strip steel 9 is increased to 1050 to 1250 DEG C, preferably 1150 in induction furnace 12 To 1200 DEG C of temperature.Here, the inductor of induction furnace 12 is manipulated in such a way that temperature is regulated, thus in mm finishing mill unit 14 In the last one rolling pass F3 before reality-temperature for measuring be equivalent to previously given target-temperature as far as possible.Pass through The measure, even if in casting speed vcAlso preset final rolling temperature is reliably achieved when very low.
Before finish rolling, de-scaling is carried out by top and bottom of the descaling device 13 to the rough rolling strip steel 9 being heated.Three In the mm finishing mill unit 14 of rack, the rough rolling strip steel 9 after de-scaling is rolled into the finished strip 15 with a thickness of 1.6 to 12mm, with Coiling temperature is cooled to by cooling section 16 afterwards, is sheared the shearing of machine 17, and be wound in rolls in winding device 18.
The other details of continuous casting installation for casting 1 are shown in FIG. 2.
Fig. 3 further illustrates vertical section 4a, curved section 4b and the level of the slab guiding mechanism 4 of continuous casting installation for casting 1 Section 4c.By straight crystallizer 2 and vertical section 4a, the field trash in steel fusant is converged at molten steel face, is cast powder End absorbs, and is lubricated in the form of casting bits for slab.The radius R of the slab guiding mechanism 4b of arc is shown in FIG. 3, It and is about 5m in the case where continuous casting installation for casting according to the present invention.Sheet billet slab 3 directly (i.e. without de-scaling) is in horizontal zone It is entered in the first roughing mill rack R1 of roughing mills 8 after section 4c.In addition, also shown is have liquid core 5 Sheet billet slab 3 is how to leave crystallizer 2 and reduce thickness in slab guiding mechanism 4.By being configured to a pair The pulling off device 7 for the slab guide reel being driven pulls out the sheet billet slab 3 that thickness reduces from crystallizer 2.In order to So that catchmenting for sheet billet slab 3 is wrapped top and is maintained in the horizontal section 4c of slab guiding mechanism 4, by controlling and/or adjusting Regulating device 20 is controllably or by adjustably setting casting speed vc, optionally also set by means of thickness reduce device 6 and into Capable thickness reduces.
The secondary cooling mechanism of the adjustable width in slab guiding mechanism 4 is shown in FIG. 4.No matter for narrow Sheet billet slab 3 still for wide sheet billet slab 3 ', all prevents the sub-cooled of the fringe region of slab, and mode is, Two external nozzles 19 are configured to not only move in the direction of the width, but also can be mobile perpendicular to casting billet surface.These nozzles 19 are connect by nozzle holder 21 with Linear actuator 22, which makes these nozzles 19 in Linear actuator 22 It is moved on axial direction.Intermediate nozzle 19 can with otherwise be fixedly constructed or same removable as shown Ground is constructed.
It is shown in Fig. 5 with DEG C and manufactures heat according to the present invention in casting-rolling-equipment complex according to the present invention Temperature trend when the finished strip rolled.Core temperature is always shown in broken lines, and surface temperature is shown with chain-dotted line, and average temperature Degree is shown by a solid line.The steel fusant of quality DD11 is vacuum-treated before continuous casting, thus the hydrogen in liquid steel is contained Amount is reduced to≤1ppm.Partially solidified sheet billet slab 3 is formed in the funneling crystallizer 2 of continuous casting installation for casting 1, with a thickness of 70mm and width are 1300mm, and are deformed into the sheet billet slab 3 with a thickness of 60mm thoroughly solidified by wick-containing pressure. The sheet billet slab 3 thoroughly solidified is with vcThe horizontal section 4c of the casting speed leaving continuous casting plant 1 of=6m/min, and without De-scaling is just conveyed to the roughing mills 8 of two racks, and there by two roughing mills rack R1 and R2 reduce at a thickness of The rough rolling strip steel 9 of 10mm.Pass through the phase between the output area of the second roughing mill rack R2 and the input area of induction furnace 12 To biggish distance, rough rolling strip steel 9 is cooled to about 860 DEG C of temperature.By induction furnace 12 or IH rough rolling strip steel 9 is reached To about 1115 DEG C of temperature.Then, by descaling device 13 or DES to 9 de-scaling of rough rolling strip steel, so that under surface temperature Drop to about 950 DEG C;In this case, core temperature is about 1020 DEG C.Then in three finishing mill machines of mm finishing mill unit 14 In frame F1, F2 and F3, the rough rolling strip steel 9 after de-scaling is rolled into the finished strip 15 with a thickness of 1.6mm, then in cooling section 16 Middle cooling, shearing, and be wound into a roll.
The thickness trend of relatively thin finished strip 15 during manufacture according to the present invention is shown in FIG. 6.It is casting Make-roll-equipment complex high-speed cruising after, originally generate the finished strip 15 with a thickness of d1=4mm.It is cold in cooling section 16 But after, continuously finished strip 15 obtained is sheared the cutting of machine 17, and is wound into first by one of winding device 18 Volume.Then, the thickness of finished strip is reduced to d2=1.6mm from d1=4mm step by step.This by least one following measure come It carries out:
A) thickness that device more tempestuously reduces sheet billet slab 3 is reduced by thickness in continuous casting installation for casting 1, so that this is thin Slab slab more unfertile land leaving continuous casting plant 1;
B) thickness for more tempestuously reducing sheet billet slab 3 by roughing mills 8, so that the more unfertile land of rough rolling strip steel 9 leaves slightly Milling train group 8;
C) thickness for more tempestuously reducing rough rolling strip steel 9 in mm finishing mill unit 14, so that the more unfertile land of finished strip 15 leaves essence Milling train group 14.
If such as only with measure a, it will be assumed that, the reduction rate in roughing mills 8 and mm finishing mill unit 14 is kept It is constant.Measure b and c are also applied for after this point is suitably modified.But certainly it is also possible that individual at manufacture one Multinomial measure is used during volume.
According to Fig. 6, finished strip is after 5 volumes with the thickness of d2=1.6mm.Then kept for about 70 volumes The thickness, and thickness is then increased to d3=3.2mm from d2=1.6mm step by step.The measure is advantageous, because on the one hand simultaneously It is indirect that extremely thin finished strip is just generated after casting-rolling-equipment complex high-speed cruising (herein with 1.6mm Thickness), but the equipment has longer time to want " from steady ".Only in this way just generate extremely thin finished strip.It casts-rolls System-equipment complex operator is usually interested in generating thin hot-strip as a large amount of as possible, because he thus can be real Existing higher profit.Before casting-rolling-equipment complex low speed operation, and increase the thickness of finished strip 15, thus in life Produce the risk that production disruption is reduced in movable final stage.Increase finished strip thickness when, it is suitably modified after along phase Anti- direction (less violent replacement is more violent, and thicker replacement is thinner) is at least using one of above-mentioned measure.In equipment Continual continuous operation using whole measures, thus avoid such as because rough rolling strip steel 9 penetrates into mm finishing mill unit 14 Caused interference.Light is the stability for thus improving manufacturing process significantly.
The thickness value and volume number being presented in Fig. 6 must not restrictively understand, but simply show an example.
Although having carried out further introduction and explanation to the present invention by preferred embodiment in detail, the present invention Therefore these disclosed examples are not limited to, and without departing from protection scope of the present invention, this field skill Art personnel can therefrom derive other modifications.
List of numerals:
1 continuous casting installation for casting
2 crystallizers
3,3 ' sheet billet slab
4 slab guiding mechanisms
The vertical section of 4a slab guiding mechanism
The curved section of 4b slab guiding mechanism
The horizontal section of 4c slab guiding mechanism
5 liquid cores
6 thickness reduce device
7 pullings off device
8 roughing mills
9 rough rolling strip steels
10 pendulum shears
11 output devices
12, IH induction furnace
13, DES descaling device
14 mm finishing mill units
15 finished strips
16 cooling sections
17 cutters
18 winding devices
19 nozzles
20 control and/or regulate device
21,21 ' nozzle holder
22 Linear actuators
D1 first thickness
D2 second thickness
D3 third thickness
F1, F2, F3 finishing mill rack
R radius
R1, R2 roughing mill rack
vcCasting speed.

Claims (16)

1. a kind of casting-rolling-equipment complex for the finished strip (15) by steel making hot rolling, comprising:
Continuous casting installation for casting (1), the continuous casting installation for casting include:
-- for being continuously manufactured by the straight crystallizer (2) of sheet billet slab (3), the sheet billet slab is from the crystallizer (2) there is when discharge liquid core (5), 60 to 75mm thickness and 900 to 1700mm width in;
-- it is used to support and guides the slab guiding mechanism (4) of the sheet billet slab (3), the slab guiding mechanism band is useful In the secondary cooling mechanism of the cooling sheet billet slab (3) and the thickness of the thickness for reducing the sheet billet slab (3) Reduce device (6), wherein the slab guiding mechanism (4) has the vertical section (4a) below the crystallizer, then has There is curved section (4b) and then there is horizontal section (4c), and the sheet billet slab (3) has after thickness reduction There is 50 to 70mm thickness;
-- device (20) are controlled or regulated, this controls or regulates device for setting secondary cooling and casting speed vc, thus institute State sheet billet slab (3) the only just thoroughly solidification in the horizontal section (4c) of the slab guiding mechanism (4);
Roughing mills (8), the roughing mills are used for the sheet billet slab (3) that roughing thickness reduces, wherein the roughing mill There are two roughing mill rack (R1, R2) for tool just for group (8), and generate the rough rolling strip steel with a thickness of 10 to 30mm by roughing (9);
Pendulum shear (10), the pendulum shear is for cutting dummy bar;
For exporting the output device (11) of the dummy bar, wherein the output device (11) has for reducing heat waste The thermal insulator of mistake;
Induction furnace (12), the induction furnace are used to rough rolling strip steel (9) be heated to 1050 to 1250 DEG C, preferably 1150 to 1200 DEG C Temperature;
Descaling device (13), the descaling device are used to carry out de-scaling to the top and bottom for the rough rolling strip steel (9) being heated;
For to the mm finishing mill unit (14) for being carried out finish rolling by the rough rolling strip steel (9) of de-scaling, wherein the mm finishing mill unit (14) is proper There are three finishing mill rack (F1, F2, F3) for good tool, and generate the finished strip (15) with a thickness of 1.6 to 12mm by finish rolling;
For the finished strip (15) being cooled to the cooling section (16) of coiling temperature;
For cutting the cutter (17) of cooled finished strip (15);With
Winding device (18), the winding device is for being wound into a roll the finished strip (15).
2. casting-rolling-equipment complex as described in claim 1, which is characterized in that the straight crystallizer (2) is funnel Formula crystallizer.
3. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that the slab guidance The curved section (4b) of mechanism (4) has 3 to 7m, preferably 4 to 6m, particularly preferred 4.5 to 5.5m arc radius R.
4. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that the secondary cooling Mechanism is respectively provided at least two in the sheet billet slab (3) at the internal multiple positions of the slab guiding mechanism (4) Width direction on moveable nozzle (19).
5. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that draw in the slab It leads in the region between the end and the roughing mills (8) of the horizontal section (4c) of mechanism (4) and has disposed thermal insulation panel.
6. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that the descaling device It (13) include multiple rotary de-scaling devices arranged in the width direction of the rough rolling strip steel (9).
7. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that the mm finishing mill unit (14) the horizontal distance between two finishing mill racks (F1, F2, F3) between 3 and 6m, particularly between 4 and 5m it Between.
8. casting-rolling-equipment complex as described in any one of the preceding claims, which is characterized in that the cooling section (16) length is preferably between 20 and 40m between 20 and 60m.
9. one kind is used in casting-rolling-equipment complex according to any one of the preceding claims by steel continuously The method for manufacturing the finished strip (15) of hot rolling has following steps:
Steel fusant is cast as sheet billet slab (3) in the straight crystallizer (2) of continuous casting installation for casting (1), wherein described thin Slab slab (3) thickness and 900 to 1700mm with liquid core, 60 to 75mm in the discharge from the crystallizer (2) Width;
The sheet billet slab (3), and benefit are supported and guided in the slab guiding mechanism (4) of the continuous casting installation for casting (1) The sheet billet slab (3) is cooled down with the secondary cooling mechanism of the continuous casting installation for casting (1);
The thickness that device (6) reduce the sheet billet slab (3) is reduced by thickness in the slab guiding mechanism (4), Wherein, the sheet billet slab (3) has 50 to 70mm thickness and v after thickness reductionc>=4m/min, preferably vc≥5m/ Min, particularly preferred vcThe casting speed of >=6m/min, and the continuous casting installation for casting (1) to control or regulate device (20) such Set secondary cooling and casting speed vc, so that the sheet billet slab (3) is only in the level of the slab guiding mechanism (4) Just thoroughly solidification in section (4c);
The sheet billet slab (3) for the non-de-scaling that the thickness that roughing is not sheared in roughing mills (8) reduces, wherein described The rough rolling strip steel (9) that sheet billet slab (3) is rolled into a thickness of 10 to 30mm by lucky two rolling passes;
Pass through pendulum shear (10) and output device (11) with not shearing;
The rough rolling strip steel (9) is heated in the induction furnace (12) 1050 to 1250 DEG C, preferably 1150 to 1200 DEG C of temperature Degree;
De-scaling is carried out to the top and bottom for the rough rolling strip steel (9) being heated in descaling device (13);
Finish rolling is carried out to the rough rolling strip steel (9) by de-scaling that do not shear in mm finishing mill unit (14), wherein the rough rolling strip steel (9) finished strip (15) with a thickness of 1.6 to 12mm is rolled by lucky three rolling passes;
The finished strip (15) is cooled to coiling temperature in cooling section (16);
Cooled finished strip (15) is cut by cutter (17);With
The finished strip (15) is wound into a roll in winding device (18).
10. method as claimed in claim 9, which is characterized in that the device (20) that controls or regulates by means of mathematical model, It is right
The reality on top is wrapped along the catchmenting for transport path of the sheet billet slab (3) in the slab guiding mechanism (4) Border position;With
Along the transport path of the sheet billet slab (3) in the slab guiding mechanism (4) and its in vertical plane Actual temperature curve,
Carry out Continuous plus, and in view of target temperature profile and it is described catchment the target position for wrapping top in the case where, The sheet billet slab (3) is cooled down with being continuously regulated by the secondary cooling mechanism.
11. the method as described in claim 9 or 10, which is characterized in that the third in the mm finishing mill unit (14) rolls road The actual temperature T1 of the finished strip (15) is measured after secondary (F3) and before the cooling in the cooling section (16)It is practical, and And multiple inductors of the induction furnace (12) are manipulated in such a way that temperature is regulated, so that the actual temperature T1It is practical It is equivalent to target temperature T1 as far as possibleTarget
12. the method as described in any one of claim 9 to 11, which is characterized in that with the sheet billet slab (3) Even liquid or operative liquid core (5) region in, the thickness reduces device (6) and uses soft reduction technique.
13. the method as described in any one of claim 9 to 12, which is characterized in that the cooling in the cooling section (16) The actual temperature T2 of continuous finished strip (15) is measured laterIt is practical, and the cooling is manipulated in such a way that temperature is regulated The cooling nozzles of section (16), so that the actual temperature T2It is practicalIt is equivalent to target temperature T2 as far as possibleTarget
14. the method as described in any one of claim 9 to 13, which is characterized in that continuous finished strip (15) is described The mm finishing mill unit (14) are left with first thickness d1 after casting-rolling-equipment complex high-speed cruising, then continual The thickness of the finished strip (15) is reduced to second thickness d2 < d1 step by step by continuous operation, and is cast-rolled described The thickness of the finished strip (15) is increased step by step in continual continuous operation before system-equipment complex low speed operation To 3 > d2 of third thickness d.
15. method as claimed in claim 14, which is characterized in that the first thickness d1 is between 3 and 12mm, and described Two thickness ds 2 are between 1.6 and 12mm, and the third thickness d 3 is between 3 and 12mm.
16. the method as described in any one of claim 9 to 15, which is characterized in that the hydrogen before continuous casting, in steel fusant Content is reduced to≤3ppm, preferably≤1ppm by being vacuum-treated.
CN201780068521.2A 2016-11-03 2017-10-24 Casting-rolling-equipment complex and the finished strip for being continuously manufactured by hot rolling method Pending CN109922904A (en)

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ATA51001/2016A AT519277A1 (en) 2016-11-03 2016-11-03 Casting and rolling plant
ATA51001/2016 2016-11-03
PCT/EP2017/077138 WO2018082966A1 (en) 2016-11-03 2017-10-24 Combined casting-rolling installation and method for the continuous production of a hot-rolled finished strip

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AT519277A1 (en) 2018-05-15

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