CN101670372A - Method for eliminating defect of strip shape of hot-rolled high-strength steel - Google Patents
Method for eliminating defect of strip shape of hot-rolled high-strength steel Download PDFInfo
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Abstract
一种消除热轧高强钢板形缺陷的方法，将平整轧制、罩式退火与辊式矫直工艺组合引入规格范围为3～18.4mm×900～1800mm(厚度×宽度)，屈服强度≥600MPa的热连轧高强钢卷板生产加工的过程，消除热连轧高强钢内应力，显著改善板形质量，并使得用户获得良好的板形稳定性，能够满足用户对平坦度小于等于2mm/m的严格要求。
A method for eliminating the shape defects of hot-rolled high-strength steel plates. The combination of skin-pass rolling, bell annealing and roller straightening processes is introduced into steel sheets with specifications ranging from 3 to 18.4mm×900 to 1800mm (thickness×width) and yield strength ≥ 600MPa. The production and processing process of hot-rolled high-strength steel coil eliminates the internal stress of hot-rolled high-strength steel, significantly improves the shape quality, and enables users to obtain good shape stability, which can meet the user's requirements for flatness less than or equal to 2mm/m strict requirements.
Description
Technical field
The invention belongs to steel processing method technical field, relate to a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel, be specially adapted to eliminate yield strength greater than the operation of rolling, the laminar flow cooling procedure of the high-strength steel of 600MPa and batch with follow-up cooling procedure in the potential flatness defect that causes of the residual stress that produces, improve the strip shape of hot-rolled high-strength steel quality.
Background technology
Hot Strip shape is a more and more higher quality index of customer requirements, influences band and opens flat, cutting stock and the working (machining) efficiency of follow-up welding process and final product quality thereof.When may causing the user to use, serious flatness defect postpones to produce, damage problems such as process equipment, welding difficulty.Especially the deck of boat, high-strength engineering machines need the plate shape of final coiled sheet is controlled with products such as steel and auto truck beams more, and the product that offers the user has high-quality plate shape.Along with the quickening of process of industrialization, the high reinforcement trend of the steel that use on the engineering is more and more obvious, and consumption is also continuing increase.The band hardness of steel is high more, the internal stress of band steel can be big more, open flat process and use after causing rolling and big distortion occurs, especially the above high-strength steel of 600MPa rank, residual stress problems is a critical process link that is related to this type of product development success or not, need carry out eliminating internal stress, solve the soleplate shape problem of opening plate from the method for machining and combined with heat treatment.
Specifically for high-intensity band steel, rolling, open in the technology such as flat, heat treatment and all may produce residual stress, the existence of residual stress will influence the forming property and the product quality of plate, the lax plate size stability that also influences of residual stress.Residual stress is the stress that is present in component inside and keeps balance in whole member inside under the situation of no any service load effect.In the time of the cutting steel plate, the residual stress in the metal sheet of cutting off obtains discharging, so distortion will appear in metal sheet.Be plate shape problem on the hot-strip internal residual stress question essence, have following four kinds of situations usually:
A) theoretically perfect tray shape
Desirable plate shape refers to the pure theory situation that equates when the horizontal internal stress of band.This desirable formation plate shape outside tension force remove and band cut into inch strips after still keeping.
B) potential plate shape
Potential plate shape is equivalent to the horizontal internal stress of band and does not wait, but the big again situation that must be enough to resist when wooden dipper is bent to be out of shape of the modulus of section of band.Band with potential plate shape is straight when not having external tension.Yet the band of cutting into inch strips has discharged latent stress, and shape is just uneven.
C) apparent plate shape
Unequal when the horizontal internal stress of band, when the section modulus of band can not be out of shape even as big as the opposing wooden dipper is bent simultaneously, apparent plate shape appearred, cause local elasticity wooden dipper song.Under suitable outer tension force, the plate shape that whole compression can be attenuated to performance changes on the level of potential plate shape.On the other hand, remove external tension and cut into inch strips, will demonstrate apparent plate shape.
D) dual plate shape
Dual plate shape is that the part of band has potential plate shape, and another part has the situation of apparent plate shape.Band one side wave or 1/4th wooden dipper songs are exemplary of this plate shape form.
The user is desired, and what obtain is that internal stress evenly distributes, the band that plate shape is good.The strip shape quality that improves hot-strip can reduce the additional process of bringing owing to deformation in the use of band steel, enhances productivity.In the face of fierce competitive market, the strip shape quality that improves hot-strip simultaneously also can be so that hot-strip manufacturer sits pretty.Solve strip produce in the strip shape quality problem be one and have the tremendous economic meaning and have very important social effect.
Hot continuous rolling is produced high-strength plate production procedure key step: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 to 7 frame four-high mill) → rolling the back laminar flow cools off → coils into coil of strip → aligning → scale crosscut.Under the certain prerequisite of mill type, the plate shape control in the operation of rolling is that the optimization of controlling technical process such as model, rolling temperature, reasonable sharing of load by roll forming design, secondary guarantees.Roll in the cooling procedure of back because the influence of transverse temperature distributing homogeneity and cooldown rate, plate shape also can change, and can and compensate the control that rolling control strategy rolls plate deformationization in the cooling procedure of back by edge part shading, the heating of limit portion.It is numerous that said process relates to the influence factor of strip shape quality, uncertain factor is many, and operating personnel's operant level and experience also be an important key element, causes the strip shape quality of control hot rolled strip in the operation of rolling well to remain very a difficulty and a complicated problem.In addition, to enter coiling machine after the TEMPERATURE FOR HOT STRIP LAMINAR cooling and be rolled into coil of strip,, cause producing in the strip coiling process additional buckling deformation internal stress because the high-strength steel coiling temperature is lower.In market with keen competition, the user need and obtain very flat steel plate or the coil of strip of cutting.How this just need remove internal stress in the process after the hot-rolling high-strength steel coiled sheet rolls, obtaining the good high-quality high-strength plate of plate shape is the precondition that the realization high-strength steel is stablized volume shipment.The domestic aspects such as the metallurgically design of high-strength steel and production process that are mainly about patent how to control the hot continuous rolling high-strength steel, specifically how not control the final products strip shape quality but relate to, disclose a kind of method of producing low carbon bainite high-strength steel based on bar strip continuous casting and rolling flow path as patent 200810030617.2; Patent 200610051132.2 has provided a kind of composite reinforced producing method of high-strength steel; Patent 200610051936.2 relates to non-quenching and tempering, high of a kind of 1100Mpa level and production method thereof; Patent 200510027399.3 provides ultra-high strength strip steel and production method thereof.About patent how to control hot continuous rolling high-strength steel strip shape quality seldom, as application number is that 200810141499.2 patent is the board-shape control method of the rolling high strength steel plate of a kind of heavy and medium plate mill, mainly carry out appropriate design, carry out the control of plate shape from heating and reduction system; Patent 200510110981.6 has provided a kind of method of testing of hot continuous rolling high strength steel plate residual stress, sets for straightening process and does reference and guidance.
Chang Gui metal material processing factory at home and abroad, the rolling coil of strip process operation of most of flat boards uses certain roll-type leveling technology, just all adopts the roll straightening unit that hot-rolled sheet coil is carried out leveling, crosscut scale basically.The patent that relates to the roll straightening technology is also more, proposes a kind of roll gap adjustable flattening machine as patent 01128973, has enlarged the specification and the strength range of machining sheet; Patent 87105049 has provided the basic design principles and the formula of straightener roller footpath and its spacing; Patent 200580025171 has provided a kind of strip straightening method.
The flatness defect type of hot-rolling high-strength steel coiled sheet mainly comprises:
A) scroll that causes of the difference in length between upper and lower surface and horizontal sinus fall into.
B) defectives such as the limit wave that the difference of a side and opposite side length causes on the width, middle wave, camber and wooden dipper song.
Roll-type leveling technology is to A) the class flatness defect has the elimination effect, and to B) type flaw can not accomplish to eliminate completely, can not obtain smooth and stable strip shape quality.If accomplish to eliminate fully above-mentioned two class flatness defects, stretch bending-straightening machine or smooth unit are good instruments, but also just in the cold rolled strip steel production process, use in a large number at present, relate to patent smooth or straightening technology as 200620092768.7,200510024681.6 etc.
Summary of the invention
The object of the present invention is to provide a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel, the problem of solution is:
1) flatness defect of the high-strength steel coiled sheet of elimination wide steel strip hot continuous rolling production line production;
2) improve the surface quality of hot continuous rolling high-strength steel;
3) make the above high-strength engineering machines of yield strength 600MPa rank have the high accuracy strip shape quality, satisfy the final requirement of using of user with hot-rolled sheet coil leveling high strength steel plates such as steel and beam steels.
Technical solution of the present invention is:
A kind of method of eliminating defect of strip shape of hot-rolled high-strength steel, production procedure may further comprise the steps: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 frames or 7 frame four-high mills) → rolling the back laminar flow cools off → coils into coil of strip → cool to room temperature, it is characterized in that: the high-strength coil of strip of hot continuous rolling is at first carried out skin pass rolling processing, carry out cover annealing then, on roll leveller, carry out the scale crosscut at last and become steel plate.
The present invention is transported to the coiled sheet storehouse to the high-strength coil of strip of hot continuous rolling, behind the normal air cool to room temperature, adopt the complicated flatness defect such as shape wave, camber and wooden dipper song that causes in the skin pass rolling technology elimination course of hot rolling, and improve the surface quality and the mechanical performance of the high-strength plate of hot rolling.
The flattening technological parameter setting range:
Roll-force: 0～1500 ton
Percentage elongation scope: 0～3%
Work roll bending: maximum bending roller force (one-sided) ± 60 ton
String roller length: 0～400mm
Tension force (maximum): forward pull 42MPa, backward pull 20MPa.
The present invention for the internal stress of the rolling and formation process generation of further eliminating the high-strength coiled sheet of hot rolling and smooth after batch the resilience stress that causes, coiled sheet is carried out the bell furnace stress relief annealing.Smooth finished band steel exists certain work hardening, and because the coil of strip after the skin pass rolling will be rolled into volume again, the bigger additional bending stress of the inner existence of coil of strip causes loose winding in the time of the later process uncoiling, the inner resilience of coil of strip causes surface tear serious.In order further to eliminate internal stress, stablize smooth back strip shape quality, carry out cover annealing, the surface tear phenomenon that plate shape unstability and loose winding cause after avoiding occurring cutting on the plank of leveling.
Concrete parameter and annealing:
Furnace gas environment: nitrogen
Annealing temperature (T1) scope: 520～560 ℃
Heating-up time (t1): 200～300 minutes
Temperature retention time (t2): 1300～1500 minutes
The first furnace cooling time (t3): 250～350 minutes
The first furnace cooling emphasis temperature (T2): 360～420 ℃
Change cooling dome and carry out the air-cooled time (t4): 420～600 minutes
Tapping temperature (T3): 90～120 ℃.
Coil of strip after the present invention adopts the roll straightening unit to cover annealing is at last aligned out flat, eliminates horizontal curved and two kinds of scroll defectives of buckling that coiling process produces, and scale, crosscut become steel plate.
Flattening machine technological parameter is set the mode of depressing from big to small that adopts:
Inlet nip: h ± 2mm (h: be the thickness of band steel)
Outlet nip: h+10 ± 2mm
The thinking of this invention is:
1, serve as the test steel grade with the hot continuous rolling high-strength engineering machines with steel SQ600MCD, specification is 6.0mm * 1400mm (thickness * width), designed the testing program of 4 kinds of process routes, found out best elimination internal stress, improve the process program that final products use strip shape quality.
The process route scheme:
1) rolling back → holding pit slow cooling → roll straightening unit aligning is opened the flat → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
2) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the first son volume → aligning is opened the flat → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
3) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the first son volume → aligning is opened the flat → flat board annealing → aligning → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
4) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the second son volume → cover annealing → aligning is opened flat → sampling → plate shape measurement → cutting test → plate shape measurement
2, the steel plate behind each process route is taken a sample, and carry out the cutting measuring plate shape and test, the core technology of having determined patent of the present invention according to final result of the test is that hot continuous rolling high-strength steel coiled sheet arrives room temperature through air cooling, at first carry out on planisher, carrying out skin pass rolling, batch the laggard bell furnace of rolling and carry out stress relief annealing, the coiled sheet after the annealing carries out roll leveller and opens flat, scale and become steel plate with crosscut.Adopt this technical process, can thoroughly eliminate the internal stress of hot continuous rolling high-strength steel coiled sheet, make and adopt the high strength steel plate of this explained hereafter to have stable smooth strip shape quality, satisfy the requirement of user's high accuracy strip shape quality.
3, the hot-rolling high-strength steel coiled sheet is carried out skin pass rolling, in the surface quality of having improved hot rolled plate simultaneously, owing to certain plastic working is arranged at thickness direction, can be so that band steel internal stress distributing homogeneity improves, eliminate shape wave, horizontal curved, wooden dipper is bent and flatness defect such as camber;
4, the hot-rolling high-strength steel coiled sheet of skin pass rolling is carried out bell type annealing furnace and carry out stress relief annealing, eliminate the work hardening and reduction internal stress that occur in the smoothing and rolling process, solve the loose winding of directly aligning appearance in the smooth back of hot-rolling high-strength steel coiled sheet and cause the surface problem that scratches to occur;
5, the hot continuous rolling high strength steel plate after the bell-type stress relief annealing is involved in capable roll straightening, scale crosscut, mode by skin pass rolling, cover annealing and three kinds of technology combinations of roll straightening, eliminate the residualinternal stress of hot continuous rolling high-strength steel coiled sheet, make the hot-rolling high-strength steel plate have smooth and keep stable strip shape quality always, can satisfy users' such as engineering machinery high precision plates shape quality requirement up to the cutting blanking.
Principle of the present invention is as follows:
1, the hot-rolling high-strength steel main specifications scope that relates to of patent of the present invention is 3～18.4mm * 900～1800mm (thickness * width), yield strength 〉=600MPa, be mainly used in critical components such as engineering machinery arm, concrete mixer, automotive frame, have intensity height, the demanding characteristics of strip shape quality.
2, the production procedure that relates to of patent of the present invention may further comprise the steps: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 frames or 7 frame four-high mills) → roll back laminar flow cools off → coils into coil of strip → cool to room temperature → skin pass rolling → cover annealing → roll straightening → scale crosscut and becomes steel plate.
3, the high-strength coil of strip of hot continuous rolling is transported to the coiled sheet storehouse, behind the normal air cool to room temperature, carries out the technological process processing of follow-up elimination flatness defect, as shown in Figure 1.
4, adopt the complicated flatness defect such as shape wave, camber and wooden dipper song that causes in the skin pass rolling technology elimination course of hot rolling, and improved the surface quality and the mechanical performance of the high-strength plate of hot rolling, as shown in Figure 2.
1) skin pass rolling main technique flow process is:
Overhead traveling crane is put into coil of strip on the fortune volume dolly, then by fortune volume dolly with the coil of strip automatic centering and be installed on the mandrel of uncoiler 1;
The coil of strip head is stripped from after pawl opens, and through 6 roller straighteners 2, the band steel is admitted to 4 roller planishers 3;
Cutting 4 pairs of band steel toe portions by crosscut carries out flush;
The coil of strip head snaps on the mandrel of coiling machine 5;
Band steel raising speed is to normal speed and carry out smooth and batch, the automatic centering control that drops into this moment and automatically the control of limit portion control uncoiler and coiling machine respectively, make the good centering of band steel.
2) flattening technological parameter setting range:
-2～0 ,-1～1,0～2mm 6 roller straightener intermesh determinations:
Roll-force: 0～1500 ton
Percentage elongation scope: 0～3%
Work roll bending: maximum bending roller force (one-sided) ± 60 ton
String roller length: 0～400mm
Tension force (maximum): forward pull 42MPa, backward pull 20MPa.
3) planisher parameter:
The smoothing roll size:
220 * 2250mm
The backing roll size:
1000～1100 * 2200mm
The working roll size:
500～550 * 2700mm
5, the internal stress that produces for the rolling and formation process of further eliminating the high-strength coiled sheet of hot rolling and smooth after batch the resilience stress that causes, coiled sheet is carried out the bell furnace stress relief annealing.Smooth finished band steel exists certain work hardening, and because the coil of strip after the skin pass rolling will be rolled into volume again, the bigger additional bending stress of the inner existence of coil of strip causes loose winding in the time of the later process uncoiling, the inner resilience of coil of strip causes surface tear serious.In order further to eliminate internal stress, stablize smooth back strip shape quality, carry out cover annealing, the surface tear phenomenon that plate shape unstability and loose winding cause after avoiding occurring cutting on the plank of leveling.Concrete annealing process system, as shown in Figure 3.
Concrete parameter and annealing:
Furnace gas environment: nitrogen
Annealing temperature (T1) scope: 520～560 ℃
Heating-up time (t1): 200～300 minutes
Temperature retention time (t2): 1300～1500 minutes
The first furnace cooling time (t3): 250～350 minutes
The first furnace cooling emphasis temperature (T2): 360～420 ℃
Change cooling dome and carry out the air-cooled time (t4): 420～600 minutes
Tapping temperature (T3): 90～120 ℃.
6, the coil of strip after adopting the roll straightening unit to cover annealing is at last aligned out flatly, eliminates horizontal curved and two kinds of scroll defectives of buckling that coiling process produces, and scale, crosscut become steel plate, as shown in Figure 4.
1) roll straightening main technique flow process is:
Overhead traveling crane is put into coil of strip on the fortune volume dolly, then by fortune volume dolly with the coil of strip automatic centering and be installed on the mandrel of uncoiler 6;
The coil of strip head is stripped from after pawl opens, and through thick straightener 7 of 5 rollers and big kink 8, the band steel is admitted to the smart straightener 9 of 9 rollers;
Cutting 10 pairs of band steel toe portions by crosscut carries out flush;
Band steel raising speed is to normal speed and carry out scale, crosscut.
2) flattening machine technological parameter is set the mode of depressing from big to small that adopts, as shown in Figure 5:
Inlet nip: h ± 2mm (h: be the thickness of band steel)
Outlet nip: h+10 ± 2mm
3) straightener parameter:
The smoothing roll size:
220～250 * 2250mm
Roller spacing: 240～285mm
The backing roll size:
230～265 * 2250mm
7, the steel plate to crosscut carries out stacking, labels, carries out the tie packing, prepares delivery and gives the user.
8, adopt the process route of skin pass rolling, cover annealing and roll leveller leveling to produce the hot continuous rolling high strength steel plate, have significant plate shape and improve effect, can satisfy the user to the strict demand of flatness smaller or equal to 2mm/m, can also make simultaneously the high-strength steel surface-brightening, and have the favorable mechanical performance.
Economic implications of the present invention and social effect and technique effect thereof:
Along with the user is more and more higher to the intensity rank requirement of hot continuous rolling high strength steel plate, the increase of demand, the requirement to strip shape quality simultaneously also is strict.Solving hot continuous rolling high strength steel plate shape quality problems, is that high-strength steel stabilizes to the prerequisite that user's supply of material dominates the market.The present invention adopts SQ600MCD as the test steel grade, carried out eliminating the process of hot continuous rolling high-strength steel flatness defect, effect is remarkable, make the product strip shape quality reach user's strict demand, satisfied user's strip shape quality requirement, and improved production efficiency and the rate of becoming a useful person, this technology has the important social meaning, and has following technique effect:
1) first skin pass rolling, bell-type annealing are become to be incorporated in the process of hot continuous rolling high-strength steel roll bending production and processing with the roll straightening process combination, eliminate hot continuous rolling high-strength steel internal stress, significantly improve strip shape quality, and make the user obtain good plate shape stability.
2) smoothing and rolling process is eliminated the complicated flatness defects such as shape wave, camber and wooden dipper song of hot continuous rolling high-strength steel, can also improve simultaneously the surface quality and the mechanical performance of band steel, solved the hot-rolling high-strength steel surface and had the serious problem of grey black, this is traditional inaccessiable effect of simple dependence roll straightening machined hot continuous rolling high strength steel plate.
3) adopt cover annealing, the internal stress after the removal skin pass rolling is eliminated the resilience stress of hot continuous rolling high-strength steel coiled sheet, and is made steel plate have better plate shape stability.
4) adopt the process route of skin pass rolling, cover annealing and roll leveller leveling to produce the hot continuous rolling high strength steel plate, have significant plate shape and improve effect, can satisfy the user the strict demand of flatness smaller or equal to 2mm/m.
Description of drawings
Fig. 1 is a process chart of eliminating hot continuous rolling high-strength steel flatness defect;
Fig. 2 is smooth unit apparatus sketch;
Among Fig. 2: 1, uncoiler, 2,6 roller straighteners, 3,4 roller planishers, 4, crosscut cuts, 5, coiling machine
Fig. 3 is a bell furnace stress relief annealing artwork;
Fig. 4 is a roll straightening unit sketch;
Among Fig. 4: 6, uncoiler, the thick straightener of 7,5 rollers, 8, big kink, the smart straightener of 9,9 rollers, 10, crosscut cuts
Fig. 5 is straightener intermesh determination figure;
Fig. 6 is a cutting test test processing schematic diagram;
Fig. 7 is several process route cutting test comparative result figure.
The specific embodiment
In May, 2009, move steel at Shoudu Iron and Steel Co and carried out the experiment work that hot continuous rolling high-strength steel coiled sheet residual stress is eliminated.Move at Shoudu Iron and Steel Co and to have carried out the rolling of 2 volume SQ600MCD on the steel 2250mm hot continuous rolling production line, specification is 6 * 1400mm (thickness * width), comprises temperature, reduction system etc., and various rolling conditions are all consistent.Concrete plate shape situation is also approaching: two coil of strips all are that head has 100 to 300IU middle unrestrained plate shape when rolling, and follow-up is limit wave plate shape.
To the coil of strip of thin specification, designed 4 kinds of process route tests that residual stress is eliminated:
1) rolling back → holding pit slow cooling → roll straightening unit aligning is opened the flat → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
2) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the first son volume → aligning is opened the flat → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
3) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the first son volume → aligning is opened the flat → flat board annealing → aligning → plate shape measurement → cutting test → plate shape measurement of taking a sample → carry out
4) rolling back → normal cooling → skin pass rolling → two son volumes of cutting → the second son volume → cover annealing → aligning is opened flat → sampling → plate shape measurement → cutting test → plate shape measurement
Parameter in the related process route is set:
1) holding pit retarded cooling process parameter: advancing to cheat temperature is 520～550 ℃, goes out holding pit behind slow cooling to 100～150 ℃.
2) the concrete parameter of formation process is set:
0,1,2mm 6 roller straighteners are set roll gap:
Tension force is set: forward pull 38MPa, backward pull 15MPa
Percentage elongation: 0.8%
Roll-force: 300t
Bending roller force :-60t
3) 9 straighteners are opened flat processing parameter setting:
Inlet nip: 7mm
Outlet nip: 17mm
4) the batch annealing parameter is set:
The furnace gas environment is a nitrogen
Annealing temperature (T1) scope: 545 ℃
Heating-up time (t1): 240 minutes
Temperature retention time (t2): 1300 minutes
The first furnace cooling time (t3): 250 minutes
The first furnace cooling emphasis temperature (T2): 390 ℃
Change cooling dome and carry out the air-cooled time (t4): 400 minutes
Tapping temperature (T3): 90 ℃
The sample of being got is carried out initial plate shape measurement, mainly comprise thickness direction warpage, width and length direction unevenness, also have camber, and carry out record.The vertical slitting of trisection is carried out in test, cutting mode, as shown in Figure 6, adopting cutting tool is cutting off machine under the plasma water.
The cutting result of the test:
1) holding pit slow cooling+aligning is opened flat
From the steel plate transmission side to the fore side serial number is 1#, 2# and 3# fillet, the plate shape measurement result of each bar:
1#: camber=2mm; Width unevenness=3mm; Length direction unevenness=7mm; Limit portion warpage (thickness direction): 28mm
2#: camber=3mm; Width unevenness=2mm; Length direction unevenness=5mm; Limit portion warpage (thickness direction): 30mm
3#: camber=3mm; Width unevenness=3mm; Length direction unevenness=2mm; Limit portion warpage (thickness direction): 24mm
2) rolling back air cooling+smooth+aligning opens flat
From the steel plate transmission side to the fore side serial number is 1#, 2# and 3# fillet, the plate shape measurement result of each bar:
1#: camber=0mm; Width unevenness=0mm; Length direction unevenness=27mm; Limit portion warpage (thickness direction): 40mm
2#: camber=0mm; Width unevenness=0mm; Length direction unevenness=28mm; Limit portion warpage (thickness direction): 43mm
3#: camber=0mm; Width unevenness=0mm; Length direction unevenness=24mm; Limit portion warpage (thickness direction): 34mm
3) roll back air cooling+smooth+batch+align+plate annealing+cold strong
From the steel plate transmission side to the fore side serial number is 1#, 2# and 3# fillet, the plate shape measurement result of each bar:
1#: camber=5mm; Width unevenness=0.5mm; Length direction unevenness=3.5mm; Limit portion warpage (thickness direction): 8mm
2#: camber=1mm; Width unevenness=2.5mm; Length direction unevenness=4mm; Limit portion warpage (thickness direction): 9mm
3#: camber=1mm; Width unevenness=1mm; Length direction unevenness=3mm; Limit portion warpage (thickness direction): 14.5mm
4) roll back air cooling+smooth+batch+bell-type annealing+aligning
From the steel plate transmission side to the fore side serial number is 1#, 2# and 3# fillet, the plate shape measurement result of each bar:
1#: camber=0mm; Width unevenness=0.5mm; Length direction unevenness=0.5mm; Limit portion warpage (thickness direction): 2.5mm
2#: camber=0mm; Width unevenness=1mm; Length direction unevenness=1mm; Limit portion warpage (thickness direction): 3mm
3#: camber=0mm; Width unevenness=0.5mm; Length direction unevenness=1mm; Limit portion warpage (thickness direction): 3.5mm
Plate shape measurement result behind more final four kinds of process routes, as shown in Figure 7, therefrom as can be seen, the 4th kind of process route is the most effective, the process route of skin pass rolling → cover annealing just → roll leveller leveling is optimum, can satisfy the strip shape quality of the 2mm/m of end user's requirement, and, surface quality is good, does not have the surperficial grey black phenomenon after other several technologies.Head upwarps a little a little, is in order to prevent in the transportation because the gravity effect causes the plate shape of the button plank two ends under, and what specially extrude in the aligning process upwarps shape a little, when the user uses, just in time is flat plate shape.The hot continuous rolling high-strength steel adopts this technology to roll back processing, can realize the production and the supply of material of the steel plate of high-quality strip shape quality in batches, and because the solution of plate shape problem, lumber recovery improves more, and user feedback is good, remarkable benefit.
Claims (5)
1, a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel, the production procedure step comprises: continuous casting steel billet heating → thick de-scaling → Fixed width forcing press → roughing → flying shear crop end → smart de-scaling → finish rolling (6 frames or 7 frame four-high mills) → rolling the back laminar flow cools off → coils into coil of strip → cool to room temperature, it is characterized in that: the high-strength coil of strip of hot continuous rolling is at first carried out skin pass rolling processing, carry out cover annealing then, on roll leveller, carry out the scale crosscut at last and become steel plate.
2, according to the described a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel of claim 1, it is characterized in that the flattening technological parameter setting range:
Roll-force: 0～1500 ton
Percentage elongation scope: 0～3%
Work roll bending: maximum bending roller force (one-sided) ± 60 ton
String roller length: 0～400mm
Tension force (maximum): forward pull 42MPa, backward pull 20MPa.
3, a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel according to claim 1 is characterized in that the batch annealing parameter:
Furnace gas environment: nitrogen
Annealing temperature (T1) scope: 520～560 ℃
Heating-up time (t1): 200～300 minutes
Temperature retention time (t2): 1300～1500 minutes
The first furnace cooling time (t3): 250～350 minutes
The first furnace cooling emphasis temperature (T2): 360～420 ℃
Change cooling dome and carry out the air-cooled time (t4): 420～600 minutes
Tapping temperature (T3): 90～120 ℃.
4, a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel according to claim 1 is characterized in that, aligning is opened flattening machine technological parameter in the flat process and set the mode of depressing from big to small that adopts:
Inlet nip: h ± 2mm (h: be the thickness of band steel)
Outlet nip: h+10 ± 2mm
5, a kind of method of eliminating defect of strip shape of hot-rolled high-strength steel according to claim 1 is characterized in that the chemical composition of hot-rolling high-strength steel:
C:0.04-0.12wt.%:Si:0.05-0.30wt.%; Mn:1.3-2.1wt.%; P≤0.025wt.%; S≤0.015wt.%; Alt:0.015-0.045wt.%; Nb:0.03-0.08wt.%; Ti:0.04-0.15wt.%; Mo:0.05-0.20wt.%, all the other are Fe and inevitable residual elements.
The specification limit of hot continuous rolling high-strength steel roll bending: 3～18.4mm * 900～1800mm (thickness * width); Yield strength 〉=600MPa.
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