CN109663818A - A kind of method that elimination steel plate rolling cracks in the process - Google Patents
A kind of method that elimination steel plate rolling cracks in the process Download PDFInfo
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- CN109663818A CN109663818A CN201811377262.4A CN201811377262A CN109663818A CN 109663818 A CN109663818 A CN 109663818A CN 201811377262 A CN201811377262 A CN 201811377262A CN 109663818 A CN109663818 A CN 109663818A
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- rolling
- steel plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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Abstract
The invention discloses a kind of methods cracked during elimination steel plate rolling, are particularly suitable for production 15~30mm thick steel plate.It by parameters such as reasonable set biting speed, mill speed, rolling mill practices, and combines reasonable passage sharing of load, improve descaling method etc., effectively eliminating the generation of steel plate crackle during the rolling process, the lumber recovery of steel plate is made to improve 1% or so.
Description
Technical field
The present invention relates to materials processing technology field more particularly to a kind of sides for eliminating steel plate rolling and cracking in the process
Method.
Background technique
The medium plate amount produced now by wide and heavy plate mill is increasing, and cut deal is in each of the development of the national economy
Field is widely applied.Cut deal is since thickness is thicker, and compression ratio is small when production, and various defects usually occurs in surface, in various tables
In planar defect, the amount that crackle accounts for is maximum.There are two types of the generation source of medium plate crackle is general, first is that slab has crackle, rolling
Since compression ratio is small when processed, when rolling, fails the crackle of steel slab surface rolling soldering completely, and the surface of steel plate rolled is caused to go out
Existing crackle；Second is that causing the surface of steel plate rolled to split due to technological parameter setting or misoperation in heating, rolling process
Line.Present various documents are generally more to slab Study on cracks, and solution is also more, and splits to operation of rolling light plate
The relevant report of line is less, and the report of solution is even more rare.And the crack width that operation of rolling light plate generates is larger, deep
Degree is deeper, and steel plate can not usually be saved by reconditioning, can only be solved by excision rejected region.This will lead to steel plate
Short ruler can not deliver contract, and the lumber recovery of steel plate can also reduce.
A kind of patent " production method for eliminating edge defects of hot rolled strip steel " of publication number " CN102101124A " provides
A method of eliminating hot-strip edge cracks.This method passes through thin in full procedure technology optimal control, capable of effectively eliminating
The edge fault problem that slab continuous casting rolling production line often occurs during producing Nb bearing steel.But this method be suitable in it is thin
The production of slab continuous casting rolling steel band is not suitable for Wide and Thick Slab production, and does not relate to the steel plate crackle generated in the operation of rolling
And.
A kind of patent " device and method for reducing slab transverse corner crack line " of publication number " CN102909333A " provides
A method of control slab transverse corner crack line, this method can effectively reduce the transverse crack in slab corner.But to steel plate rolling mistake
The crackle generated in journey without reference to.
The patent " a method of solve special thick continuous casting billet transverse corner crack line " of publication number " CN103008594A " provides
A method of special thick continuous casting billet corner crack is solved, can be effectively controlled the transverse corner crack line of special thick continuous casting billet.But this method pair
How being produced without for controlled rolling process light plate crackle is related to.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide crack during a kind of elimination steel plate rolling
Method, be particularly suitable for production 15~30mm thickness steel plate.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
2, a kind of to eliminate the method cracked during steel plate rolling, include the following steps:
The last a time of S1, rough rolling step crosses passage using empty mistake, to be empty；
Until S2, rough rolling step are rolled down to always the second stage open rolling thickness of steel plate from slab thickness, rough rolling step is whole
Roll 50 DEG C of start rolling temperature or more that temperature is greater than second stage；
S3, the open rolling in finish rolling stage are with a thickness of 3~4 times of finished product thicknesses, 8~10 passages of finish rolling stage rolling, finish rolling rank
The biting speed of section the first two passage is 1.5~1.8m/s, mill speed is 4.5~5m/s；Finish rolling stage the first two passage
Drafts is 10~12mm, and the start rolling temperature in finish rolling stage is 910~940 DEG C, and finishing temperature is 810~830 DEG C；
The first two passage that S4, second stage roll carries out de-scaling processing.
Further, the dephosphorization processing in the step S4 uses rack de-scaling.
Further, de-scaling processing is removed using counter in the step S4, i.e., to using machine when rolling after machine before steel plate slave
Descaling device carries out de-scaling afterwards, carries out de-scaling using descaling device before machine to when rolling before machine after slave.
Further, the steel plate applied to production 15~30mm thickness.
When the Plate rolling of Stand Mill, usually second stage is completed in the rolling of roughing completion first stage, finish rolling
Rolling.After the completion of first stage rolling, intermediate base swings cooling on roller-way thick, between finishing mill, is cooled to second stage
Start rolling temperature when start the rolling of second stage.For intermediate base when swinging cooling, surface can generate one layer of iron scale, in essence
Water spray is carried out except removing iron scale using rack descaling device when rolling, and iron scale is avoided to be pressed into surface of steel plate in rolling
Form pit.Slab causes the intermediate base rolled wave often occur due to often there is discount when roughing mill rolls, and
To avoid iron scale from being pressed into steel plate, de-scaling is carried out in first of rolling of finish rolling, in this way in first of rolling of finishing mill, is removed
Squama water can be assembled at wave, and since intermediate base is when finish rolling starts rolling, surface temperature is relatively low, by the peak of wave
Top casting is black, serious crackle occurs, this crack depth is deeper, wide since temperature is low, plasticity is poor at the summit of wave when rolling
Degree is wider, and the thickness of steel plate is exceeded after reconditioning, and steel plate is caused to be scrapped.Therefore it solves this because intermediate blanket shape is bad, de-scaling is led
The crackle of cause, biting speed, mill speed de-scaling mode when should roll from finish rolling etc. are solved.Using stinging faster
Enter speed and mill speed, is the time of contact in order to reduce steel plate Yu de-scaling water, reduces the temperature drop of surface of steel plate.Preceding a time
It rolls, when starting rolling to latter passes, centre has one section of passage interval time, removes according to counter, even if steel plate table
Face occur wave poured it is black, can also be returned in this following period of time it is red, surface temperature increase, plasticity restore, when rerolling processed so just
It is not in crackle.Due to the secondary de-scaling in the road Tou Liangge of finish rolling rolling, lesser drafts is used in the first two passage,
Lesser drafts is to keep the steel plate rolled straight for controlled rolling plate shape, without wave, such the first two passage de-scaling,
The temperature of surface of steel plate is also uniform, and without low-temperature space, when rolling is not in crackle.
Compared with prior art, advantageous effects of the invention:
1, the generation of crackle during Plate rolling can be effectively eliminated using the method for the present invention；
2, addition other equipment are not needed using the method for the present invention, do not need to increase operator, does not need additional investment,
It is easy to accomplish in actual production；
3, this method is easy to operate, is easy to realize in production operation at the scene, convenient for the popularization and application of this method.
Specific embodiment
The invention will be further described with reference to embodiments.
Embodiment 1
Mill product crosses passage using empty mistake, to be empty with a thickness of 15mm thick steel plate, the last a time of rough rolling step；Roughing rank
Until section is rolled down to always the open rolling thickness 60mm of second stage from slab thickness, 990 DEG C of the finishing temperature of rough rolling step.Steel plate
The open rolling of second stage rolls 8 passages with a thickness of 60mm, second stage, and the biting speed of second stage the first two passage is
1.8m/s, mill speed 5m/s；The drafts of second stage the first two passage is 10mm.Second stage start rolling temperature is 940
DEG C, finishing temperature is 830 DEG C.The first two passage of second stage rolling uses rack de-scaling, and de-scaling mode is removed using counter, i.e. steel
De-scaling is carried out using descaling device after machine to when rolling after machine before plate slave, is filled to when rolling before machine using de-scaling before machine after slave
Set carry out de-scaling.The plate surface quality rolled is good, without crackle.
Embodiment 2
Mill product crosses passage using empty mistake, to be empty with a thickness of 30mm thick steel plate, the last a time of rough rolling step；Roughing rank
Until section is rolled down to always the open rolling thickness 90mm of second stage from slab thickness, 1102 DEG C of the finishing temperature of rough rolling step.Steel
The open rolling of plate second stage rolls 10 passages, the biting speed of second stage the first two passage with a thickness of 90mm, second stage
For 1.5m/s, mill speed 4.5m/s；The drafts of second stage the first two passage is 12mm.Second stage start rolling temperature is
910 DEG C, finishing temperature is 810 DEG C.The first two passage of second stage rolling uses rack de-scaling, and de-scaling mode is removed using counter,
To de-scaling is carried out using descaling device after machine when rolling after machine i.e. before steel plate slave, removed after slave to before using machine when rolling before machine
Squama device carries out de-scaling.The plate surface quality rolled is good, without crackle.
Embodiment 3
Mill product crosses passage using empty mistake, to be empty with a thickness of 22mm thick steel plate, the last a time of rough rolling step；Roughing rank
Until section is rolled down to always the open rolling thickness 77mm of second stage from slab thickness, 1089 DEG C of the finishing temperature of rough rolling step.Steel
The open rolling of plate second stage rolls 9 passages with a thickness of 77mm, second stage, and the biting speed of second stage the first two passage is
1.6m/s, mill speed 4.8m/s；The drafts of second stage the first two passage is 11mm.Second stage start rolling temperature is
915 DEG C, finishing temperature is 817 DEG C.The first two passage of second stage rolling uses rack de-scaling, and de-scaling mode is removed using counter,
To de-scaling is carried out using descaling device after machine when rolling after machine i.e. before steel plate slave, removed after slave to before using machine when rolling before machine
Squama device carries out de-scaling.The plate surface quality rolled is good, without crackle.
Embodiment 4
Mill product crosses passage using empty mistake, to be empty with a thickness of 20mm thick steel plate, the last a time of rough rolling step；Roughing rank
Until section is rolled down to always the open rolling thickness 68mm of second stage from slab thickness, 1077 DEG C of the finishing temperature of rough rolling step.Steel
The open rolling of plate second stage rolls 9 passages with a thickness of 68mm, second stage, and the biting speed of second stage the first two passage is
1.7m/s, mill speed 4.7m/s；The drafts of second stage the first two passage is 11.5mm.Second stage start rolling temperature is
920 DEG C, finishing temperature is 821 DEG C.The first two passage of second stage rolling uses rack de-scaling, and de-scaling mode is removed using counter,
To de-scaling is carried out using descaling device after machine when rolling after machine i.e. before steel plate slave, removed after slave to before using machine when rolling before machine
Squama device carries out de-scaling.The plate surface quality rolled is good, without crackle.
After the present invention, the generation of Wide and Thick Slab crackle during the rolling process is eliminated, the lumber recovery of steel plate greatly improves, than
1% or so is improved before implementation, effect is fairly obvious.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (4)
1. a kind of eliminate the method cracked during steel plate rolling, which comprises the steps of:
The last a time of S1, rough rolling step crosses passage using empty mistake, to be empty；
Until S2, rough rolling step are rolled down to always the second stage open rolling thickness of steel plate from slab thickness, rough rolling step finish to gauge temperature
Degree is greater than 50 DEG C of start rolling temperature or more of second stage；
S3, the open rolling in finish rolling stage are with a thickness of 3~4 times of finished product thicknesses, 8~10 passages of finish rolling stage rolling, before the finish rolling stage
The biting speed of two passages is 1.5~1.8m/s, mill speed is 4.5~5m/s；The pressure of finish rolling stage the first two passage
Amount is 10~12mm, and the start rolling temperature in finish rolling stage is 910~940 DEG C, and finishing temperature is 810~830 DEG C；
The first two passage that S4, second stage roll carries out de-scaling processing.
2. according to claim 1 eliminate the method cracked during steel plate rolling, which is characterized in that the step
Dephosphorization processing in S4 uses rack de-scaling.
3. according to claim 2 eliminate the method cracked during steel plate rolling, which is characterized in that the step
De-scaling processing is removed using counter in S4, i.e., before steel plate slave to when rolling after machine using descaling device progress de-scaling after machine, after slave
De-scaling is carried out using descaling device before machine when rolling before to machine.
4. the method cracked during elimination steel plate rolling according to claim 1 to 3, feature exist
In applied to the steel plate for producing 15~30mm thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811377262.4A CN109663818B (en) | 2018-11-19 | 2018-11-19 | Method for eliminating cracks generated in steel plate rolling process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811377262.4A CN109663818B (en) | 2018-11-19 | 2018-11-19 | Method for eliminating cracks generated in steel plate rolling process |
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| CN109663818A true CN109663818A (en) | 2019-04-23 |
| CN109663818B CN109663818B (en) | 2021-03-02 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1034217A (en) * | 1996-07-18 | 1998-02-10 | Nisshin Steel Co Ltd | Arithmetic and control method of forward slip and backward slip in hot rolling mill |
| CN101947549A (en) * | 2010-09-10 | 2011-01-19 | 山东泰山钢铁集团有限公司 | Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack |
| CN102101124A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Production method for eliminating edge defects of hot rolled strip steel |
| CN103624088A (en) * | 2013-11-29 | 2014-03-12 | 内蒙古包钢钢联股份有限公司 | Method for eliminating transverse cracks on steel plate tail |
| CN106148846A (en) * | 2016-08-19 | 2016-11-23 | 山东钢铁股份有限公司 | A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method |
| CN106987773A (en) * | 2017-05-05 | 2017-07-28 | 内蒙古包钢钢联股份有限公司 | A kind of high strength steel plate and its board-shape control method |
-
2018
- 2018-11-19 CN CN201811377262.4A patent/CN109663818B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1034217A (en) * | 1996-07-18 | 1998-02-10 | Nisshin Steel Co Ltd | Arithmetic and control method of forward slip and backward slip in hot rolling mill |
| CN102101124A (en) * | 2009-12-22 | 2011-06-22 | 鞍钢股份有限公司 | Production method for eliminating edge defects of hot rolled strip steel |
| CN101947549A (en) * | 2010-09-10 | 2011-01-19 | 山东泰山钢铁集团有限公司 | Production technology for inhibiting nickel-saving austenitic stainless steel hot-rolled plate edge crack |
| CN103624088A (en) * | 2013-11-29 | 2014-03-12 | 内蒙古包钢钢联股份有限公司 | Method for eliminating transverse cracks on steel plate tail |
| CN106148846A (en) * | 2016-08-19 | 2016-11-23 | 山东钢铁股份有限公司 | A kind of thick-specification high-tenacity X80 pipe fitting steel steel plate and manufacture method |
| CN106987773A (en) * | 2017-05-05 | 2017-07-28 | 内蒙古包钢钢联股份有限公司 | A kind of high strength steel plate and its board-shape control method |
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| CN109663818B (en) | 2021-03-02 |
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