CN103624088B - Eliminate the method for steel plate tail transverse crack - Google Patents
Eliminate the method for steel plate tail transverse crack Download PDFInfo
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Abstract
The invention discloses a kind of method eliminating steel plate tail transverse crack, step comprises: the start rolling temperature of roughing is 1150 ~ 1230 DEG C, the reduction ratio & gt of last passage of roughing; 10%, mill speed is 1.1 ~ 2.5m/s, last passes temperature & gt; 1000 DEG C, the open rolling thickness of second stage rolling is 1.3 ~ 2.8 times of finished steel plate thickness; During intermediate blank rolling, the first of second stage rolling is that sky crosses passage, and finishing mill shifts to an earlier date 90 ~ 120 seconds and opened by finish rolling roll gap, roll gap 150mm larger than workpiece thickness, and it is 2m/s that sky crosses speed; By intermediate blank from empty excessively to machine before finishing mill, and de-scaling water is removed intermediate blank scale on surface before intermediate blank uses finishing stand machine from mistake empty before finishing mill after machine; Second stage rolling is started when being cooled to the start rolling temperature of second stage rolling, till steel plate is rolled finished steel plate thickness, finished steel plate thickness is 30 ~ 100mm, the start rolling temperature of second stage rolling is 880 ~ 950 DEG C, require reduction ratio >=13% having a time at least, mill speed is between 2 ~ 4m/s.
Description
Technical field
The invention belongs to material processing field, particularly a kind of method eliminating steel plate afterbody transverse crack.
Background technology
When adopting Stand Mill production Wide and Thick Slab, roughing mill generally first completes the rolling of first stage, and subsequently the roller-way of intermediate blank between roughing, finish rolling swings cooling, when being cooled to the start rolling temperature of second stage, finishing mill starts the rolling of second stage.Because the second stage start rolling temperature of steel plate is lower, and workpiece thickness is thicker, during rolling, surface temperature is low, surface temperature is generally at about 820 DEG C, and also have because intermediate blank is thicker, roughing is complete, the temperature of intermediate blank is higher, from roughing rolls finish rolling during rolling, the time of staying temperature of intermediate blank experience is longer, and the secondary oxidation iron sheet on surface is thicker.Surface of steel plate is pressed into for avoiding iron scale, guarantee plate surface quality is good, during finish rolling rolling the first passage, with the machine forebay de-scaling water of finish rolling, de-scaling is carried out to intermediate blank surface, intermediate blank surface is being treated that the scale on surface formed in warm process removes.Due to the intermediate blank that roughing rolls, usually there is nose or occur wave because of intermediate blank afterbody 0 ~ 2 meter of kowtowing in its afterbody, such finish rolling rolling, during the first passage de-scaling, de-scaling water is assembled at the nose of intermediate blank afterbody or wave place, watered by afterbody black, low owing to watering black place temperature during rolling, plasticity is poor, there is transverse crack, the general degree of depth of this crackle is comparatively dark, and after reconditioning, the thickness of steel plate exceeds standard, and causes whole steel plate not use.
Steel plate transverse crack has multiple, majority is because slab has transverse crack, rolls rear crackle and stays surface of steel plate, therefore present research substantially all concentrate on solve slab transverse crack on, little to producing the research of transverse crack in steel plate tail in the operation of rolling.
The patent of publication number CN102909333A provides a kind of method and apparatus reducing strand transverse corner crack line, effectively can reduce the transverse crack in strand bight by the method.But this invention mainly solves slab transverse crack, the transverse crack that operation of rolling light plate afterbody produces is not discussed.
Summary of the invention
Technical problem solved by the invention is to provide a kind of method eliminating steel plate tail transverse crack, and generation simple to operate, effectively to avoid afterbody transverse crack in the steel plate operation of rolling, is applicable to the production that thickness is greater than 30mm steel plate.
Technical scheme is as follows:
Eliminate a method for steel plate tail transverse crack, step comprises:
The start rolling temperature of roughing is 1150 ~ 1230 DEG C, last passage of rough rolling step rolling is the loading passage having roll-force, the reduction ratio >10% of last passage of roughing, mill speed is 1.1 ~ 2.5m/s, last passes temperature >1000 DEG C; Roughing is by slab rolling to the open rolling thickness of second stage rolling, and the open rolling thickness of second stage rolling is 1.3 ~ 2.8 times of finished steel plate thickness;
During intermediate blank rolling, the first of second stage rolling is that sky crosses passage, and finishing mill shifts to an earlier date 90 ~ 120 seconds and opened by finish rolling roll gap, roll gap 150mm larger than workpiece thickness, and it is 2m/s that sky crosses speed;
After roll gap is opened, intermediate blank is crossed to machine from empty before finishing mill, and intermediate blank from before finishing mill empty cross use finishing stand machine during machine before de-scaling water, intermediate blank scale on surface is removed;
Intermediate blank sky is crossed after machine, continue to swing cooling, second stage rolling is started when being cooled to secondary start rolling temperature, till steel plate is rolled finished steel plate thickness, finished steel plate thickness is 30 ~ 100mm, secondary start rolling temperature is 880 ~ 950 DEG C, and require reduction ratio >=13% having a time at least, mill speed is between 2 ~ 4m/s.
Further: 250mm heavy slab is rolled to the open rolling thickness of the second stage rolling of 108mm by roughing, the start rolling temperature of roughing is 1230 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 12%, mill speed is 1.5m/s, and the rolling temperature of last passage is 1120 DEG C; Finish rolling first passage is that sky crosses passage, and within 110 seconds, opened by roll gap in advance, roll gap is 258mm, and it is 2m/s that sky crosses speed, and before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface; Intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to the start rolling temperature 880 DEG C of second stage rolling, till steel plate is rolled 60mm, second stage rolling is 5 passages, every time reduction ratio corresponding is respectively 7.4%, 12%, 15.9%, 13.5% and 6.3%, and the mill speed of corresponding passage is respectively 2.5m/s, 2.8m/s, 2.8m/s, 2.8m/s, 2.8m/s, and finished steel plate thickness is the steel plate that 60mm is thick.
Further: 250mm heavy slab is rolled to the open rolling thickness of the second stage rolling of 130mm by roughing, the start rolling temperature of roughing is 1192 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 11.2%, mill speed is 1.1m/s, and the rolling temperature of last passage is 1122 DEG C; First passage of second stage rolling is that sky crosses passage, and within 90 seconds, opened by roll gap in advance, roll gap is 250mm, and it is 2m/s that sky crosses speed, and before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface; Intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to the start rolling temperature 910 DEG C of second stage rolling, till steel plate is rolled 100mm, second stage rolling is two passages, every time reduction ratio corresponding is respectively 15.45% and 9.1%, and the mill speed of corresponding passage is respectively 2.0m/s and 2.2m/s, and finished steel plate thickness is the steel plate that 100mm is thick.
Compared with prior art, the technology of the present invention effect comprises:
1, the present invention can ensure plate surface quality, effectively can avoid again the generation of operation of rolling light plate afterbody transverse crack, adopts after the inventive method, the steel plate transverse crack produced in the operation of rolling by former monthly about 300 tons be down to about 10 tons.
2, method of operating of the present invention is simple, is convenient to promote.
3, the present invention only slightly need adjust in method of operating, changes without any need for additional investment and equipment.
4, the present invention is particularly suitable for the production that thickness is more than or equal to 30mm steel plate.
Detailed description of the invention
The present invention is suitable for the generation that elimination thickness is more than or equal to 30mm steel plate transverse crack in the operation of rolling.By ensureing the loading of last passage of roughing, finish rolling first passage is empty cross passage, arrange suitable sky and cross roll gap, emptyly cross speed, emptyly in advance cross time, empty out-of-date de-scaling, and intermediate blank continuation swing is cooled to the measures such as second stage start rolling temperature is rolled again after sky, avoid the generation of transverse crack in the steel plate operation of rolling, the surface of steel plate simultaneously rolled does not have iron scale to be pressed into yet, and surface quality is good.
Eliminate the method for steel plate tail transverse crack, step comprises:
Step 1: the start rolling temperature of roughing is 1150 ~ 1230 DEG C, last passage of rough rolling step rolling is the loading passage having roll-force, and namely last passage of roughing is by rolling after machine forward direction machine; The reduction ratio >10% of last passage of roughing, mill speed is 1.1 ~ 2.5m/s, last passes temperature >1000 DEG C; Roughing is by slab rolling to the open rolling thickness of second stage, and second stage open rolling thickness is 1.3 ~ 2.8 times of finished steel plate thickness;
As previously mentioned, the situation easily occurring nose during Plate rolling or kowtow, the intermediate blank head that such roughing rolls likely upwarp or under kowtow, and afterbody is flat.Last passage of rough rolling step rolling is the loading passage having roll-force, and namely last passage also has drafts, and when this and usual rolling, last passage is usually that passage is different excessively for sky.
Step 2: during intermediate blank rolling, finish rolling first is that sky crosses passage, and finishing mill shifts to an earlier date 90 ~ 120 seconds and opened by finish rolling roll gap, roll gap 150mm larger than workpiece thickness, and it is 2m/s that sky crosses speed;
Roll gap aperture is comparatively large, and mainly in order to intermediate blank can emptyly smoothly be crossed after finishing mill machine, empty mistake is rolling in order to not affect second stage in advance.
Step 3: after roll gap is opened, crosses intermediate blank after machine from empty before finishing mill, and in intermediate blank from when before finishing mill, sky is crossed after machine, de-scaling water before use finishing stand machine, removes intermediate blank scale on surface;
Empty out-of-dately carries out de-scaling, the iron scale formed when the temperature can be removed, simultaneously owing to there is no drafts, although de-scaling water also intermediate blank can be upwarped or sweep waters black, there will not be transverse crack; Due to the impact of de-scaling water is the thickness that intermediate blank surface 1 ~ 2mm is thick, sky is crossed after machine, when temperature, intermediate blank surface is returned red, and temperature sharply rises, treat that temperature tens seconds rear surface temperature return are normal, when rerolling processed, would not occur transverse crack phenomenon, lower sky crosses speed, object is the time ensureing empty out-of-date intermediate blank surface de-scaling, and the iron scale on intermediate blank surface is removed fully.
Step 4: intermediate blank sky is crossed after machine, continue to swing cooling, when being cooled to secondary start rolling temperature, start second stage rolling, till steel plate is rolled finished steel plate thickness, finished steel plate thickness is 30 ~ 100mm, and secondary start rolling temperature is 880 ~ 950 DEG C, require reduction ratio >=13% having a time at least, mill speed is between 2 ~ 4m/s.
Because intermediate blank sky is crossed after finishing mill machine, what roughing rolling was complete upwarp or under the intermediate blank head of kowtowing afterbody when becoming finish rolling rolling, and the head of the straight intermediate blank afterbody portion that roughing rolls when becoming finish rolling rolling, during such finish rolling rolling, intermediate blank can by frame of nipping smoothly, and rolling is complete smoothly.So just can reach the object not only eliminated steel plate tail transverse crack but also can produce smoothly.
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1
250mm heavy slab is rolled to the second stage open rolling thickness of 84mm by roughing, the start rolling temperature of roughing is 1150 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 10%, mill speed is 2.5m/s, and the rolling temperature of last passage is 1050 DEG C.
Finish rolling first passage is that sky crosses passage, roll gap was opened in 120 seconds in advance, roll gap is 234mm, it is 2m/s that sky crosses speed, before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface, intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to second stage start rolling temperature 950 DEG C, till steel plate is rolled 30mm, second stage rolling 6 passage, every time reduction ratio corresponding is respectively 11.9%, 16.2%, 19.5%, 19.8%, 15%, 11.8%, the mill speed of corresponding passage is respectively 3.8m/s, 4m/s, 4m/s, 4m/s, 4m/s, 4m/s.Finished steel plate thickness is the steel plate that 30mm is thick, rolls rear plate surface quality all right, does not have crackle and iron scale press-in.
Embodiment 2
250mm heavy slab is rolled to the second stage open rolling thickness of 108mm by roughing, the start rolling temperature of roughing is 1230 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 12%, mill speed is 1.5m/s, and the rolling temperature of last passage is 1120 DEG C.
Finish rolling first passage is that sky crosses passage, roll gap was opened in 110 seconds in advance, roll gap is 258mm, it is 2m/s that sky crosses speed, before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface, intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to second stage start rolling temperature 880 DEG C, till steel plate is rolled 60mm, second stage rolling 5 passage, every time reduction ratio corresponding is respectively 7.4%, 12%, 15.9%, 13.5%, 6.3%, the mill speed of corresponding passage is respectively 2.5m/s, 2.8m/s, 2.8m/s, 2.8m/s, 2.8m/s.Finished steel plate thickness is 60mm, rolls rear plate surface quality all right, does not have crackle and iron scale press-in.
Embodiment 3
250mm heavy slab is rolled to the second stage open rolling thickness of 130mm by roughing, the start rolling temperature of roughing is 1192 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 11.2%, mill speed is 1.1m/s, and the rolling temperature of last passage is 1122 DEG C.
Finish rolling first passage is that sky crosses passage, roll gap was opened in 90 seconds in advance, roll gap is 250mm, it is 2m/s that sky crosses speed, before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface, intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to second stage start rolling temperature 910 DEG C, till steel plate is rolled 100mm, second stage rolling two passage, every time reduction ratio is respectively 15.45%, 9.1% accordingly, and the mill speed of corresponding passage is respectively 2.0m/s, 2.2m/s.Finished steel plate thickness is 100mm, rolls rear plate surface quality all right, does not have crackle and iron scale press-in.
Claims (3)
1. eliminate a method for steel plate tail transverse crack, step comprises:
The start rolling temperature of roughing is 1150 ~ 1230 DEG C, last passage of rough rolling step rolling is the loading passage having roll-force, the reduction ratio >10% of last passage of roughing, mill speed is 1.1 ~ 2.5m/s, last passes temperature >1000 DEG C; Roughing is by slab rolling to the open rolling thickness of second stage rolling, and the open rolling thickness of second stage rolling is 1.3 ~ 2.8 times of finished steel plate thickness;
During intermediate blank rolling, the first of second stage rolling is that sky crosses passage, and finishing mill shifts to an earlier date 90 ~ 120 seconds and opened by finish rolling roll gap, roll gap 150mm larger than workpiece thickness, and it is 2m/s that sky crosses speed;
After roll gap is opened, intermediate blank is crossed to machine from empty before finishing mill, and intermediate blank from before finishing mill empty cross use finishing stand machine during machine before de-scaling water, intermediate blank scale on surface is removed;
Intermediate blank sky is crossed after machine, continue to swing cooling, second stage rolling is started when being cooled to the start rolling temperature of second stage rolling, till steel plate is rolled finished steel plate thickness, finished steel plate thickness is 30 ~ 100mm, the start rolling temperature of second stage rolling is 880 ~ 950 DEG C, and require reduction ratio >=13% having a time at least, mill speed is between 2 ~ 4m/s.
2. eliminate the method for steel plate tail transverse crack as claimed in claim 1, it is characterized in that: 250mm heavy slab is rolled to the open rolling thickness of the second stage rolling of 108mm by roughing, the start rolling temperature of roughing is 1230 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 12%, and mill speed is 1.5m/s, and the rolling temperature of last passage is 1120 DEG C; First passage of second stage rolling is that sky crosses passage, and within 110 seconds, opened by roll gap in advance, roll gap is 258mm, and it is 2m/s that sky crosses speed, and before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface; Intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to the start rolling temperature 880 DEG C of second stage rolling, till steel plate is rolled 60mm, second stage rolling is 5 passages, every time reduction ratio corresponding is respectively 7.4%, 12%, 15.9%, 13.5% and 6.3%, and the mill speed of corresponding passage is respectively 2.5m/s, 2.8m/s, 2.8m/s, 2.8m/s, 2.8m/s, and finished steel plate thickness is the steel plate that 60mm is thick.
3. eliminate the method for steel plate tail transverse crack as claimed in claim 1, it is characterized in that: 250mm heavy slab is rolled to the open rolling thickness of the second stage rolling of 130mm by roughing, the start rolling temperature of roughing is 1192 DEG C, last passage of roughing is the loading passage having roll-force, by rolling after the machine forward direction machine of roughing, the reduction ratio of last passage of roughing is 11.2%, and mill speed is 1.1m/s, and the rolling temperature of last passage is 1122 DEG C; First passage of second stage rolling is that sky crosses passage, and within 90 seconds, opened by roll gap in advance, roll gap is 250mm, and it is 2m/s that sky crosses speed, and before empty out-of-date use finishing stand machine, de-scaling water carries out de-scaling to intermediate blank surface; Intermediate blank sky is crossed after machine, continue to swing cooling, rolling is started when being cooled to the start rolling temperature 910 DEG C of second stage rolling, till steel plate is rolled 100mm, second stage rolling is two passages, every time reduction ratio corresponding is respectively 15.45% and 9.1%, and the mill speed of corresponding passage is respectively 2.0m/s and 2.2m/s, and finished steel plate thickness is the steel plate that 100mm is thick.
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| CN104028560B (en) * | 2014-06-18 | 2016-08-24 | 内蒙古包钢钢联股份有限公司 | The method eliminating the layering of 45# steel plate mid-depth end to end |
| CN104561485B (en) * | 2014-12-31 | 2016-11-23 | 南阳汉冶特钢有限公司 | A kind of production method rolling flawless steel plate |
| CN109202664B (en) * | 2018-09-20 | 2020-11-17 | 孙佑军 | Grinding method capable of eliminating grinding cracks |
| CN109663818B (en) * | 2018-11-19 | 2021-03-02 | 包头钢铁（集团）有限责任公司 | Method for eliminating cracks generated in steel plate rolling process |
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| JPH06315702A (en) * | 1993-05-07 | 1994-11-15 | Nippon Steel Corp | Manufacture of thin steel sheet excellent in surface property and manufacturing equipment line therefor |
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