CN106552831B - A kind of manufacturing method of thin gauge hot-strip - Google Patents

A kind of manufacturing method of thin gauge hot-strip Download PDF

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Publication number
CN106552831B
CN106552831B CN201611064638.7A CN201611064638A CN106552831B CN 106552831 B CN106552831 B CN 106552831B CN 201611064638 A CN201611064638 A CN 201611064638A CN 106552831 B CN106552831 B CN 106552831B
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rack
strip
roughing
finishing mill
base
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CN106552831A (en
Inventor
王国栋
李海军
袁国
张殿华
李旭
孙杰
彭文
祭程
蔡兆镇
郑淑国
罗森
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Northeastern University China
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Northeastern University China
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Priority to CN2016104894623 priority
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • 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
    • B21B1/22Metal-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 plates, strips, bands or sheets of indefinite length
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B31/00Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/08Interchanging rolls, roll mountings, or stand frames, e.g. using C-hooks; Replacing roll chocks on roll shafts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B39/00Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • 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
    • B21B45/08Devices 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 hydraulically
    • 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
    • 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

Abstract

A kind of manufacturing method of thin gauge hot-strip, it is characterized in that the thin-slab caster of a single machine list stream is directly connected with milling train, steel-making → continuous casting → rocking shears → pushes away steel → de-scaling → Edge Heating → roughing mills → flying shear → no-core winder → induction heating → de-scaling → mm finishing mill unit → strip cool down → is sheared → and batches → unload volume → bundling → fortune volume → weighing, head-stamp → transport → storage.Using endless rolling technique, or single base rolling mill practice.Caster outlet slab temperature is higher by 100~150 DEG C compared with ESP production line, improves the utilization rate of continuous casting billet waste heat, reduce energy consumption;Compared with ESP production line, by rocking shears and pushes away steel rider road and migrate to roughing mill, shorten the distance of delay table after roughing, reduce intermediate base temperature drop, reduce induction heating amount, and can avoid roughing mill roll and generate fire check.Roughing mills entrance is equipped with descaling device, and mm finishing mill unit uses online backup technique and online fast roll changing technology, effectively improves product surface quality.

Description

A kind of manufacturing method of thin gauge hot-strip
Technical field
The invention belongs to hot-rolled sheet strip steel rolling technical fields, more particularly to a kind of manufacturer of thin gauge hot-strip Method.
Background technique
The appearance of ESP sheet billet endless rolling production line, makes extensive steady production thin gauge hot-strip become a reality. On Arvedi ESP production line, by continuous production processes, molten steel directly passes through a conticaster and rolling line produces hot rolling Coil of strip.Production line pours first casts out sheet billet, then immediately proceeds to the three rack heavy reduction roughing for being arranged in caster outlet Machine is rolled, and the intermediate base for 10~20mm of thickness is rolled, and next intermediate base is heated in induction heater, then Target thickness is rolled out by five rack finishing mills, subsequent strip enters section cooling area and cooled down.It is without a head continuous after cooling Strip cut by the high-speed flying shear before coiling machine located underground by important ask of product volume, batch as finished steel Volume.
In place of Shortcomings: for ESP endless rolling production line because conticaster and milling train are connected directly, the speed of milling train will be with company The speeds match of casting machine, however because mill speed is slow in use at present, so rolled piece temperature drop is big;In addition, being rolled when caster outlet Part core temperature is about 1250 DEG C, well below solidus temperature, fails to make full use of continuous casting waste heat before illustrating, so intermediate Base needs to carry out about 250 DEG C of induction heating or so before entering mm finishing mill unit, and concurrent heating power consumption improves production cost.Roughing mill entrance Descaling device is not configured, and the roll change period is long, roll wear is serious, causes product surface quality bad.
Summary of the invention
The object of the present invention is to provide a kind of manufacturing methods of thin gauge hot-strip, solve current ESP production line power consumption High, the problems such as surface quality is bad.
A kind of manufacturing method of thin gauge hot-strip of the invention, it is characterised in that entire process flow are as follows: steel-making → Continuous casting → rocking shears → pushes away steel → de-scaling → Edge Heating → roughing mills → flying shear → no-core winder → induction heating → de-scaling Volume → bundling → fortune volume → weighing, head-stamp → transport → storage are batched → unloaded to → mm finishing mill unit → strip cool down → is sheared →;It closes Key step and parameter: in continuous casting step, the pulling rate of conticaster is 4.0~8.0m/min, preferably 5.5~6.0m/min;Crystallizer Slab being exported with a thickness of 90~110mm, carries out liquid core reduction in fan-shaped section, caster outlet slab thickness is 80~ 100mm;Keeping caster outlet casting blank surface temperature is 1050~1150 DEG C, and slab core temperature is 1300~1400 DEG C;Even Slab is rolled into the intermediate base of 10~20mm through three rack heavy reduction four-high roughers;Using dynamic variable specification technology, finished product Specification is gradually to the thin slab product transition of 0.8~1.0mm.
The present invention due to the adoption of the above technical scheme, has the advantage that
(1) caster outlet slab temperature is higher by 100~150 DEG C compared with ESP production line, improves the utilization of continuous casting billet waste heat Rate reduces energy consumption.
(2) it compared with ESP production line, by rocking shears and pushes away steel rider road and migrates to roughing mill, it on the one hand can be to avoid roughing mill Entrance slab surface temperature is excessively high, causes roll fire check, on the other hand because, the distance of delay table after roughing can be shortened, Intermediate base temperature drop is reduced, induction heating amount is reduced.
(3) it by rocking shears and pushes away steel rider road and migrates to roughing mill, open and pour stage head without wedge-shaped transition base, improve gold Belong to recovery rate.
(4) roughing mills entrance is equipped with descaling device, and mm finishing mill unit uses online backup technique and online fast roll changing skill Art can effectively improve product surface quality, extend the roll change period of entire mm finishing mill unit, improve and individually pour secondary rolling kilometer Number.
Detailed description of the invention
Fig. 1 is thin gauge hot-strip production technology layout drawing.
Specific embodiment
The manufacturing method of thin gauge hot-strip, it is characterised in that device configuration used in the method for the present invention implementation: one The thin-slab caster of platform single machine list stream is directly connected with milling train, in caster outlet configuration rocking shears and pushes away steel rider road, pendulum-type The function of cutting is to cut off dummy bar and end to end base, and cutting continuous casting billet is used for when single base rolls;When finishing mill and subsequent handling occur Cutting when failure, for continuous casting billet;Installation, offline and end to end base release of the steel rider road for dummy bar are pushed away, finishing mill is worked as And for releasing continuous casting billet when subsequent handling failure.
High pressure water descaling device and one group of edge induction heating apparatus are arranged in roughing mill entrance, and high pressure water descaling device can Under conditions of less than 50 DEG C of temperature drops, iron scale is removed, improves Surface Quality of Steel Billet.Edge induction heating apparatus can be to slab Corner compensate heating and soaking, prevent operation of rolling edge cracks, improve product quality.
Preferably, strength vertical miller is arranged in roughing mill entrance, required according to finished width, adjust slab width.
Continuous casting billet is rolled into the intermediate base of 10~20mm through three rack heavy reduction four-high roughers.Roughing mill is in slab table High temperature heavy reduction rolling is carried out under the inverse temperature profiling conditions that face temperature is low, core temperature is high, draught pressure is small, energy consumption is small, The permeability that slab core deformation can be effectively improved keeps slab thickness direction tissue and performance more uniform.
Roughing mill outlet arrangement flying shear, no-core winder equipment and accident loop.When finishing mill and subsequent handling break down When shutdown, the flying shear of rocking shears and roughing mill outlet before roughing carries out cutting, and accident loop lifts, and empties flying shear and coreless roll The roller-way in area is taken, the blank between subsequent rocking shears and flying shear is batched by no-core winder equipment, by day after the completion of batching Vehicle is hung out.
Intermediate base is warm by process requirements progress induction heating benefit before entering mm finishing mill unit, and induction heating segment length 6~ 12m can carry out dynamic regulation, accurate to control mm finishing mill unit inlet temperature.
Mm finishing mill unit entrance arranges the high pressure water descaling device with pinch roller, design pressure 38MPa, low discharge, high pressure Intermediate base temperature drop can be reduced, belt steel surface iron scale is removed;Front and back pinch roller has water shutoff effect, can reduce intermediate base surface Ponding, while preventing steam from entering induction heating apparatus.
Optionally, arrange that attached vertical miller carries out in intermediate base and edging, inhibits in mm finishing mill unit entrance Spreading when rolling improves quality of edges.
Intermediate base is rolled into target thickness through mm finishing mill unit.Preferably, mm finishing mill unit is equipped with six rack four-high mills, wherein 6th rack F6As online hot standby rack.As the 5th rack F5When serious wear, rack F is depressed6, lift the 5th rack F5
Optionally, the 4th rack F of mm finishing mill unit4With the 5th rack F5It is equipped with online Quick roll-changing device, during the rolling process Fast roll changing is carried out, the roll changing time of entire mm finishing mill unit is extended, improves and individually pours secondary rolling milimeter number.
Preferably, to reduce the temperature drop in production process, distance is 4.0~4.5m between mm finishing mill unit rack.
Finishing mill outlet arranges roller repairing device, and the cooling of different mode can be carried out by product tissue performance requirement.It is excellent Selection of land, using the arrangement of section cooling and rear-mounted ultra-rapid cooling, the high value added products such as dual phase steel easy to produce.Layer Stream is cooling and Ultrafast cooling device is equipped with flow control valve, and collector flow can be adjusted according to process requirements.
Under production model without a head, strip after cooling by the high-speed flying shear before coiling machine located underground according to target Volume is cut again, is batched by downcoiler as finished steel coils.Preferably, it is equipped with pinch roller before and after high-speed flying shear, guarantees The stabilization of strip tension in shear history.
Preferably, for convenient for coiling machine head steady threading, outfit pressure zone blower, prevents thin rule on coiling machine front roller-way The floating of lattice strip steel head.
After strip is coiled, volume is unloaded through coil stripping car, bundling, weighing and head-stamp are then carried out, then through conveyer chain or overhead traveling crane It is transported to warehouse for finished product.
Embodiment:
The process layout of thin gauge strip production technology of the present invention is as shown in Figure 1.Specific implementation step is as follows:
(1) the qualified molten steel of steelshop production is transported to continuous casting workshop, with the steel of overhead traveling crane handling to ladle turret On back stall, opens and pour after ladle turret half rotation to casting position.
(2) open and pour the pulling rate of rear conticaster and step up to 6.0m/min, crystallizer export thickness of strand be 90~ 110mm, fan-shaped section depress 10mm, and caster outlet slab thickness is 80~100mm.Caster outlet slab table after pulling rate is stablized Face temperature is 1050~1150 DEG C, and slab core temperature is 1300~1400 DEG C.
(3) dummy bar tail end is by the way that after rocking shears about 0.5m, rocking shears carries out shearing manipulation, and by manipulator quickly by dummy ingot After bar releases roller-way, it is hung on special stand by crane.
(4) rocking shears cuts off the coldhead base of 5~10m, quickly releases roller-way by manipulator, subsequent continuous casting billet is through de-scaling and side Enter the intermediate base that roughing mills are rolled into 10~20mm after portion's induction heating.The product volume weight of rocking shears according to demand before roughing Amount carries out cutting to continuous casting billet, and no-core winder is rolled using single base production model.
(5) the intermediate sensed heating furnace concurrent heating of base is rolled into after de-scaling into mm finishing mill unit to 1050~1100 DEG C The torrid zone of 4.75mm is cooled to 600~650 DEG C through roller repairing area, and shearing is batched in rolls by downcoiler.
(6) after rolling 3~4 blocks of steel, trimmed size is gradually transitioned into 2.5mm, switches to endless rolling production method, according to Product volume weight demands carry out bundling by the high-speed flying shear before downcoiler.
(7) dynamic variable specification technology is used, trimmed size is gradually to the thin slab product transition of 0.8~1.0mm.
(8) when pour time proceed to 1/2~2/3 when, step up finished product thickness specification to 2.5mm, the 6th machine of mm finishing mill unit F6Frame pressure, the 5th rack F5It lifts, the 5th rack F5Online fast roll changing is carried out, the 5th rack F is used after the completion of roll change5Pressure, 4th rack F4It lifts.
(9) trimmed size is again gradually to the thin slab product transition of 0.8~1.0mm.
(10) it even pours when closing to an end, product specification is switched to list by production model without a head gradually to think gauge transition Base production model.
(11) after being poured, the tail base of 5~10m or so is cut off by rocking shears, and roller-way is released by manipulator, is then shut down It is overhauled.
When mm finishing mill unit in the operation of rolling or downstream process disorderly closedown, what rocking shears and roughing mill before roughing exported flies Carry out cutting is cut, accident loop lifts, and empties the roller-way of flying shear and no-core winder area, the blank between subsequent rocking shears and flying shear It is batched by no-core winder equipment, roller-way is gone out by overhead traveling crane handling after the completion of batching.Conticaster continues to produce, and continuous casting billet is by putting Formula cuts carry out cutting, and releases roller-way by manipulator.After troubleshooting, continuous casting billet reenters milling train and is rolled.
The strip rolling mode different for thickness: strip thickness≤2.0mm product uses endless rolling mode;Strip The product of thickness G T.GT.GT 3.5mm is using single base mode;2.0 < strip thicknesses≤3.5mm product, it is raw using single base rolling mode It produces, or uses endless rolling.

Claims (3)

1. a kind of manufacturing method of thin gauge hot-strip, it is characterised in that entire process flow includes following processing step: refining Steel → continuous casting → rocking shears → push away steel → de-scaling → Edge Heating → roughing mills → flying shear → no-core winder → induction heating → De-scaling → mm finishing mill unit → strip cool down → is sheared → is batched → is unloaded volume → bundling → fortune volume → weighing, head-stamp → and transports → deposit It puts;Committed step and parameter: in continuous casting step, the pulling rate of conticaster is 4.0~8.0m/min;Crystallizer export slab with a thickness of 90~110mm carries out liquid core reduction in fan-shaped section, and caster outlet slab thickness is 80~100mm;Conticaster is kept to go out Mouth casting blank surface temperature is 1050~1150 DEG C, and slab core temperature is 1300~1400 DEG C;Continuous casting billet is through the big pressure of three racks Amount four-high rougher is rolled into the intermediate base of 10~20mm;Using dynamic variable specification technology, trimmed size gradually to 0.8~ The thin slab product transition of 1.0mm;The setting of device therefor: conticaster is directly connected with milling train, configures and puts in caster outlet Steel rider road is cut and pushed away to formula, arranges that high pressure water descaling device and one group of edge induction heating apparatus, roughing mill go out in roughing mill entrance Mouth arrangement flying shear, no-core winder equipment and accident loop;Mm finishing mill unit entrance arranges the high pressure water descaling device with pinch roller, essence Milling train group is equipped with six rack four-high mills, and finishing mill outlet arranges roller repairing device, using section cooling and rear-mounted ultrafast The arrangement of quickly cooling but, high-speed flying shear front and back are equipped with pinch roller;The mm finishing mill unit configures six rack four-high mills, using Line backup technique and online fast roll changing technology: wherein the 6th rack is as online hot standby rack, when the 5th rack serious wear When, the 6th rack is depressed, the 5th rack is lifted;4th and the 5th rack is equipped with online Quick roll-changing device, in the operation of rolling Middle carry out fast roll changing: the pressure of the 6th rack of mm finishing mill unit, the 5th rack are lifted, and online fast roll changing are carried out, after the completion of roll change The pressure of 5th rack, the 4th rack are lifted.
2. the manufacturing method of thin gauge hot-strip according to claim 1, it is characterised in that the equipment preferred disposition: Conticaster is the thin-slab caster of a single machine list stream;Arrange that strength vertical miller, roughing mill go out in the roughing mill entrance Mouth arrangement flying shear and no-core winder equipment, when finishing mill and subsequent handling failure, flying shears are used for base among cutting, No-core winder equipment is used to batch the intermediate base after rocking shears and roughing between flying shear;High pressure water descaling device design pressure 38MPa, low discharge;Attached vertical miller is arranged in mm finishing mill unit entrance, and intermediate base is carried out to neutralization edging;Finishing mill Distance is 4.0~4.5m between the rack of six rack four-high mills of group, can dynamic regulation;Section cooling and Ultrafast cooling device are equal It is equipped with flow control valve, collector flow can be adjusted according to process requirements;Pinch roller is equipped with before and after high-speed flying shear, in coiling machine preliminary roller Pressure zone blower is equipped on road.
3. the manufacturing method of thin gauge hot-strip according to claim 1, it is characterised in that different for thickness is thin With rolling mode: strip thickness≤2.0mm product uses endless rolling mode;The product of strip thickness > 3.5mm is using single Base mode;2.0 < strip thicknesses≤3.5mm product is produced using single base rolling mode, or uses endless rolling.
CN201611064638.7A 2016-06-28 2016-11-28 A kind of manufacturing method of thin gauge hot-strip Active CN106552831B (en)

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