CN117983669A - Control method for reducing tail breaking rate of hot-rolled thin strip steel - Google Patents
Control method for reducing tail breaking rate of hot-rolled thin strip steel Download PDFInfo
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- 238000005096 rolling process Methods 0.000 claims abstract description 106
- 208000002740 Muscle Rigidity Diseases 0.000 claims abstract description 9
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 5
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- 239000002253 acid Substances 0.000 description 1
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Abstract
A control method for reducing the tail breaking rate of hot-rolled thin strip steel relates to the field of steel rolling. The control method for reducing the tail rolling breaking rate of the hot-rolled thin strip steel comprises the steps of controlling the plastic rigidity of the corresponding stand to be respectively in a second preset range when the rolling force ranges of the first four stands are respectively in the first preset range; and when the rolling force range of the last three frames is in the third preset range, controlling the plastic rigidity of the corresponding frames to be in the fourth preset range respectively. The control method for reducing the tail rolling breaking rate of the hot-rolled thin strip steel can improve the stability in the tail casting process and meet the rapid adjustment of the tail shape by automatically leveling the tail of the strip steel when the tail of the strip steel passes through each frame, and solves the problem of tail rolling breaking in the rolling process of the hot-rolled thin strip steel.
Description
Technical Field
The application relates to the field of steel rolling, in particular to a control method for reducing the tail rolling breaking rate of hot-rolled thin-specification strip steel.
Background
The thin slab continuous casting and rolling production line (CSP production line) is more beneficial to the production of thin materials compared with the conventional hot rolling due to the process characteristics, and simultaneously has huge market potential of the hot rolled pickled steel with thin specification under the pushing of acid strip cooling.
The control of the plate shape of the tail part of the strip steel is a difficult point in the production process of rolling the thin-specification acid-washing steel, the rolling stability is directly affected by the rolling break of the tail part of the strip steel, the strip steel fragments generated on the working roller of the rolling mill are stuck on the roller, the damage to the working roller is caused, the quality defect of the surface of the subsequent strip steel is caused, the problems of the falling pull speed, the breakage, the casting break, the roll stripping, the roll break and the like are caused when the strip steel is seriously caused, particularly when the thickness of a finished product of the strip steel rolled by a finishing mill is less than or equal to 2.0mm, the central line of the tail part of the strip steel deviates from the central line of the rolling stabilizing period when the strip steel is thrown, so that the tail part of the strip steel is deviated when the thin material is rolled, the tail part of the strip steel is thrown, the tail part of the strip steel is broken, and the conditions of the finish rolling are seriously affected.
Disclosure of Invention
The application aims to provide a control method for reducing the tail rolling breaking rate of hot-rolled thin strip steel, which can improve the stability in the tail casting process and meet the rapid adjustment of the tail shape by automatically leveling the tail of the strip steel when the tail of the strip steel passes through each frame, and solves the problem of tail rolling breaking in the rolling process of the hot-rolled thin strip steel.
The application is realized in the following way:
the application provides a control method for reducing the tail breaking rate of hot-rolled thin strip steel, which comprises the following steps:
When the rolling force ranges of the first frame, the second frame, the third frame and the fourth frame are 0-5000KN、5000-10000KN、10000-15000KN、15000-20000KN、20000-25000KN、25000-30000KN、30000-35000KN、35000-40000KN, controlling the plastic rigidity of the first frame, the second frame, the third frame and the fourth frame to be respectively 1235-1351KN/mm、1352-1417KN/mm、1418-1464KN/mm、1465-1500KN/mm、1501-1530KN/mm、1531-1556KN/mm、1557-1587KN/mm、1588-1620KN/mm;
When the rolling force of the fifth frame, the sixth frame and the seventh frame is in the range of 0-4000KN, 4000-8000KN, 8000-12000KN, 12000-16000KN, 16000-20000KN and 20000-24000KN, the plastic rigidity of the fifth frame, the sixth frame and the seventh frame is respectively 1159-1270KN/mm, 1271-1334KN/mm, 1335-1380KN/mm, 1381-1415KN/mm, 1416-1444KN/mm and 1445-1480KN/mm.
In some alternative embodiments, the first stand is controlled to rapidly open the roll gap when the tail of the strip steel reaches the roll gap, the minimum rolling force when the first stand triggers the quick opening is 5000KN, the minimum triggering proportion of the quick opening loop control valve corresponding to the first stand is 50%, the maximum using proportion of the quick opening loop control valve corresponding to the first stand is 150%, and the minimum roll gap when the first stand triggers the quick opening is changed to 0.05mm.
In some alternative embodiments, the first stand is controlled to automatically control the roll gap correction gain factor of 2.05 when the roll gap is opened rapidly when the tail of the strip reaches the roll gap.
In some alternative embodiments, the first stand is controlled to open the gap rapidly when the tail of the strip reaches the gap, such that the first stand is triggered to open rapidly by a maximum distance of 1.5m from the tail of the strip.
In some alternative embodiments, the second stand is controlled to rapidly open the roll gap when the tail of the strip steel reaches the roll gap, the minimum rolling force when the second stand triggers the quick opening is 5000KN, the minimum triggering proportion of the quick opening loop control valve corresponding to the second stand is 80%, the maximum using proportion of the quick opening loop control valve corresponding to the second stand is 175%, and the minimum roll gap change when the second stand triggers the quick opening is 0.05mm.
In some alternative embodiments, the second stand is controlled to automatically control the roll gap correction gain factor to 2 when the roll gap is opened quickly when the tail of the strip reaches the roll gap.
In some alternative embodiments, the second stand is controlled to open the gap rapidly when the tail of the strip reaches the gap, such that the second stand is triggered to open rapidly by a maximum distance of 1m from the tail of the strip.
In some alternative embodiments, the inlet guide short stroke openings controlling the second, third, fourth, fifth, sixth, and seventh racks are 30mm, 70mm, 100mm, 150mm, respectively.
In some alternative embodiments, the inlet guide short stroke lengths controlling the second, third, fourth, fifth, sixth, and seventh racks are 5m, 10m, 12m, 18m, 25m, respectively.
The beneficial effects of the application are as follows: according to the control method for reducing the tail rolling breaking rate of the hot-rolled thin strip steel, which is provided by the application, the stability of the tail in the tail throwing process can be improved and the rapid adjustment of the tail shape can be met by automatically leveling the tail of the strip steel when the tail of the strip steel passes through each frame, the manual leveling of an operator is assisted or replaced, the ineffective leveling caused by visual errors is avoided, the problem of tail rolling breaking in the rolling process of the hot-rolled thin strip steel is solved, the quality of the strip steel is improved, and the occurrence amount of waste and defective products is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a strip tail edge diagram of a first stand and a second stand outlet after rolling mill tail quick-opening without using the control method for reducing the rolling breaking rate of the tail of the hot rolled thin gauge strip steel provided by the embodiment of the application;
FIG. 2 is a graph of strip tail edges of the outlets of the first and second frames after the rolling mill tail is opened quickly by using the control method for reducing the rolling rate of the tail of the hot rolled thin gauge strip steel provided by the embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a control method for reducing the tail rolling breaking rate of hot-rolled thin strip steel, which is used for adjusting a first frame F1, a second frame F2, a third frame F3, a fourth frame F4, a fifth frame F5, a sixth frame F6 and a seventh frame F7 which are respectively provided with an upper roller and a lower roller in a rolling mill, and specifically comprises the following steps:
Step one, rolling mill tail fast opening, as shown in table 1 below:
The first frame F1 of the rolling mill is controlled to rapidly open the roll gap when the tail part of the strip steel reaches the roll gap, the minimum rolling force when the first frame F1 triggers the quick opening is 5000KN, the starting minimum triggering proportion of the quick-opening loop control valve corresponding to the first frame F1 is 50%, the starting maximum using proportion of the quick-opening loop control valve corresponding to the first frame F1 is 150%, the minimum roll gap when the first frame F1 triggers the quick opening is changed to 0.05mm, the roll gap automatic control correction gain coefficient of the first frame F1 is 2.05, and the longest distance from the tail part of the strip steel when the first frame F1 triggers the quick opening is 1.5m.
The second frame F2 of the rolling mill is controlled to rapidly open the roll gap when the tail part of the strip steel reaches the roll gap, the minimum rolling force when the second frame F2 triggers the quick opening is 5000KN, the starting minimum triggering proportion of the quick-opening loop control valve corresponding to the second frame F2 is 80%, the starting maximum using proportion of the quick-opening loop control valve corresponding to the second frame F2 is 175%, the minimum roll gap when the second frame F2 triggers the quick opening is changed to 0.05mm, the roll gap automatic control correction gain coefficient of the second frame F2 is 2, and the maximum distance from the tail part of the strip steel when the second frame F2 triggers the quick opening is 1m.
Table 1 rolling mill tail quick opening parameters
The rolling mill tail quick-opening is used for reducing uneven extension of the strip steel tail, acts on a front frame, namely a first frame F1 and a second frame F2, and is used for judging that the H-AGC cylinder roll gap is quickly opened when the strip steel tail reaches the corresponding frame roll gap through rolling force so as to reduce the influence of the rolling force on the shape of the strip steel tail, shorten the uneven extension length of the strip steel tail, reduce ineffective adjustment when the rear frame tail throws steel, and further reduce the rolling breaking rate of the strip steel tail in a non-tensioned state.
Step two, automatically leveling the tail part of the rolling mill, as shown in the following table 2;
When the rolling force ranges of the first frame F1, the second frame F2, the third frame F3 and the fourth frame F4 are 0-5000KN、5000-10000KN、10000-15000KN、15000-20000KN、20000-25000KN、25000-30000KN、30000-35000KN、35000-40000KN, the plastic rigidity of the first frame F1, the second frame F2, the third frame F3 and the fourth frame F4 are respectively controlled to be 1235-1351KN/mm、1352-1417KN/mm、1418-1464KN/mm、1465-1500KN/mm、1501-1530KN/mm、1531-1556KN/mm、1557-1587KN/mm、1588-1620KN/mm;
When the rolling force of the fifth frame F5, the sixth frame F6 and the seventh frame F7 is in the range of 0-4000KN, 4000-8000KN, 8000-12000KN, 12000-16000KN, 16000-20000KN, 20000-24000KN, the plastic rigidity of the fifth frame F5, the sixth frame F6 and the seventh frame F7 is respectively 1159-1270KN/mm, 1271-1334KN/mm, 1335-1380KN/mm, 1381-1415KN/mm, 1416-1444KN/mm and 1445-1480KN/mm.
Table 2 automatic leveling parameters for mill tail
The automatic leveling of the tail part of the rolling mill is a function developed for improving the stability of the tail part in the steel throwing process, assisting or replacing manual leveling of an operator, and the automatic leveling device is used for achieving rapid adjustment of the shape of the tail part of the strip steel by taking the pressure head force difference of two sides of a frame before steel throwing as a reference in a static parameter table after the steel is thrown on the front frame of the leveling frame, namely under the condition that the front frame of the leveling frame is out of tension. The plastic rigidity is characterized by rolling force change caused by horizontal adjustment quantity per millimeter, and static data is collected to the relation between leveling and rolling force change in the daily production process. In the stage of rolling and casting steel, the automatic leveling quantity of the tail part needed to be performed for balancing the change of the rolling force difference at two sides is calculated according to a static table.
Step three, controlling short travel of the inlet guide plate of the rolling mill, as shown in the following table 3;
The short-stroke opening degrees of the inlet guide plates of the second frame F2, the third frame F3, the fourth frame F4, the fifth frame F5, the sixth frame F6 and the seventh frame F7 are controlled to be 30mm, 70mm, 100mm and 150mm respectively; the inlet guide short stroke lengths of the second, third, fourth, fifth, sixth and seventh racks F2, F3, F4, F5, F6 and F7 are controlled to be 5m, 10m, 12m, 18m, 25m, respectively.
TABLE 3 short-stroke control parameters for entry guide of rolling mill
| F2 | F3 | F4 | F5 | F6 | F7 | |
| Short stroke opening (mm) of inlet guide plate | 30 | 30 | 30 | 70 | 100 | 150 |
| Short stroke length (m) of inlet guide plate | 5 | 5 | 10 | 12 | 18 | 25 |
The short stroke control of the tail part of the rolling mill is to reduce the situation that the tail part of the strip steel is scratched with the inlet guide plate of the stand in the steel throwing process, the tail part of the strip steel is in general uneven two-side extension, the contact between the tail part of the strip steel and the inlet guide plate of the stand is caused to scratch due to the uneven two-side extension, the tail part of the strip steel is caused to produce deformation such as folding, scraping and the like, and the strip steel is deformed and then enters the roll gap of the stand to cause the strip steel to roll, so that the tail part of the strip steel is prevented from contacting with the inlet guide plate of the stand through proper increase of the short stroke of the tail part of the rolling mill, and the tail part of the strip steel is effectively prevented from producing additional deformation.
According to the control method for reducing the rolling breaking rate of the tail part of the hot-rolled thin strip steel, disclosed by the embodiment of the application, the tail part of the rolling mill is controlled to be opened quickly when the strip steel is rolled to the tail part for throwing, the thickness closed-loop control of the HGC cylinder is slower in the process of opening when the strip steel reaches the tail part of the strip steel, the rolling force is reduced to cause the tail part of the strip steel to be thinner and longer to generate larger extension, and the extension can be continuously prolonged at the rear stand to have adverse effects on rolling stability, so that the quick response of the HGC cylinders of the first stand F1 and the second stand F2 in the tail part throwing process is ensured by confirming the parameters of the tail part of the front stand of the rolling mill, and the tail part extension of the strip steel and the invalid adjustment of the follow-up stand are reduced.
The embodiment of the application controls the automatic leveling of the tail part of the rolling mill, because the strip steel tail part deviates from the rolling center line due to poor plate shape during casting, the manual adjustment speed is 0.07mm each time, the automatic leveling speed can reach more than 20 times of manual operation through development and optimization of the automatic leveling of the strip steel tail part, the correction of the plate shape of the strip steel tail part plays a key role, and meanwhile, the automatic leveling adopts a pure rolling force closed loop technology to avoid ineffective leveling caused by visual errors.
The embodiment of the application controls the short stroke of the tail part of the inlet guide plate of the rolling mill frame, so as to reduce and eliminate deformation of the tail part of the strip steel, which is caused by contact with the inlet guide plate before entering the roll gap, in the steel throwing process, avoid the occurrence of folding and rolling break conditions which are caused by abnormal deformation after entering the roll gap, reduce the quality problem of roll marks and reduce the loss of roll consumption caused by abnormal roll replacement.
The characteristics and properties of the control method for reducing the tail break rate of hot rolled thin gauge strip of the present application are described in further detail below with reference to the examples.
Example 1
The embodiment of the application provides a control method for reducing the tail rolling breaking rate of hot-rolled thin strip steel, which is characterized in that when SPHC-B strip steel with the specification of 1.2mm multiplied by 1219mm is produced, the tail quick opening of a rolling mill, the tail automatic leveling of the rolling mill and the short stroke of the tail of an inlet guide plate of a rolling mill stand are respectively adjusted according to the following table 4, table 5 and table 6, and the problem of strip steel tail rolling breaking does not occur throughout the year.
Table 4 example 1 of the adjustment of the mill tail quick-open parameters
Table 5 automatic leveling parameters for the mill tail in example 1
TABLE 6 short Stroke control parameters of the Rolling Mill inlet guide in example 1
Example 2
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of a hot rolled thin strip steel, which is characterized in that when Q235B strip steel with the specification of 1.4mm multiplied by 1250mm is produced, the tail part of a rolling mill is respectively adjusted to be quickly opened, the tail part of the rolling mill is automatically leveled, the tail part of an inlet guide plate of a stand of the rolling mill is automatically leveled, and the rolling breaking problem of the tail part of the strip steel does not occur throughout the year.
Table 7 example 2 adjustment of mill tail quick-open parameters
Table 8 automatic leveling parameters for mill tail in example 2
Table 9 short run control parameters of the mill inlet guide in example 2
Example 3
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of hot-rolled thin strip steel, which is characterized in that when Q235B strip steel with the specification of 1.8mm multiplied by 1500mm is produced, the tail part of a rolling mill is respectively adjusted to be quickly opened, the tail part of the rolling mill is automatically leveled, the tail part of an inlet guide plate of a stand of the rolling mill is automatically leveled, and the rolling breaking problem of the tail part of the strip steel does not occur throughout the year.
Table 10 example 3 adjustment of mill tail quick-open parameters
Table 11 example 3 mill tail auto leveling parameters
Table 12 short run control parameters of the mill inlet guide in example 3
Example 4
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of hot-rolled thin strip steel, which is characterized in that when Q235B strip steel with the specification of 1.5mm multiplied by 1500mm is produced, the tail part of a rolling mill is respectively adjusted to be opened quickly, the tail part of the rolling mill is automatically adjusted to be in a short stroke with the tail part of an inlet guide plate of a stand of the rolling mill according to the following table 13, table 14 and table 15, and the problem of rolling breaking of the tail part of the strip steel does not occur throughout the year of production.
Table 13 example 4 adjusting mill tail quick-open parameters
Table 14 automatic leveling parameters for Rolling mill tail in example 4
Table 15 short run control parameters for the mill inlet guide in example 4
Example 5
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of a hot rolled thin strip steel, which is characterized in that when SPA-H strip steel with the specification of 1.5mm multiplied by 1175mm is produced, the tail part quick opening of a rolling mill, the tail part automatic leveling of the rolling mill and the short stroke of the tail part of an inlet guide plate of a rolling mill stand are respectively adjusted according to the following table 16, the table 17 and the table 18, and the problem of rolling breaking of the tail part of the strip steel does not occur throughout the year.
Table 16 example 5 adjustment of mill tail quick-open parameters
Table 17 example 5 mill tail auto leveling parameters
Table 18 short run control parameters of the mill inlet guide in example 5
Example 6
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of hot-rolled thin strip steel, which is characterized in that when SAE1006 strip steel with the specification of 2.0mm multiplied by 1214mm is produced, the tail part of a rolling mill is respectively adjusted to be opened quickly, the tail part of the rolling mill is automatically leveled and the tail part of an inlet guide plate of a stand of the rolling mill is short in stroke according to the following table 19, table 20 and table 21, and the problem of rolling breaking of the tail part of the strip steel does not occur throughout the year of production.
Table 19 example 6 adjusting mill tail quick open parameters
Table 20 example 6 mill tail auto leveling parameters
Table 21 short run control parameters of the mill inlet guide in example 6
Example 7
The embodiment of the application provides a control method for reducing the rolling breaking rate of the tail part of a hot rolled thin strip steel, which is characterized in that when Q345B strip steel with the specification of 1.8mm multiplied by 1500mm is produced, the tail part of a rolling mill is respectively adjusted to be opened quickly, the tail part of the rolling mill is automatically adjusted to be in a short stroke with the tail part of an inlet guide plate of a stand of the rolling mill according to the following table 22, the table 23 and the table 24, and the problem of rolling breaking of the tail part of the strip steel does not occur throughout the year.
Table 22 example 7 adjustment of mill tail quick-open parameters
Table 23 automatic leveling parameters for mill tail in example 7
TABLE 24 short Stroke control parameters for Rolling Mill Inlet guide in example 7
The embodiments described above are some, but not all embodiments of the application. The detailed description of the embodiments of the application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Claims (9)
1. A control method for reducing the tail breaking rate of hot-rolled thin strip steel is characterized by comprising the following steps:
when the rolling force ranges of the first stand, the second stand, the third stand and the fourth stand are 0-5000KN、5000-10000KN、10000-15000KN、15000-20000KN、20000-25000KN、25000-30000KN、30000-35000KN、35000-40000KN, controlling the plastic rigidity value intervals of the first stand, the second stand, the third stand and the fourth stand to be respectively 1235-1351KN/mm、1352-1417KN/mm、1418-1464KN/mm、1465-1500KN/mm、1501-1530KN/mm、1531-1556KN/mm、1557-1587KN/mm、1588-1620KN/mm;
When the rolling force of the fifth frame, the sixth frame and the seventh frame is in the range of 0-4000KN, 4000-8000KN, 8000-12000KN, 12000-16000KN, 16000-20000KN, 20000-24000KN, the plastic rigidity of the fifth frame, the sixth frame and the seventh frame is respectively 1159-1270KN/mm, 1271-1334KN/mm, 1335-1380KN/mm, 1381-1415KN/mm, 1416-1444KN/mm and 1445-1480KN/mm.
2. The control method for reducing the rolling break rate of the tail portion of the hot rolled thin gauge strip steel according to claim 1, wherein the first stand is controlled to rapidly open the roll gap when the tail portion of the strip steel reaches the roll gap, the minimum rolling force when the first stand triggers the quick open is 5000KN, the minimum triggering proportion of the quick open loop control valve corresponding to the first stand is 50%, the maximum using proportion of the quick open loop control valve corresponding to the first stand is 150%, and the minimum roll gap change when the first stand triggers the quick open is 0.05mm.
3. The control method for reducing the tail break rate of a hot rolled thin gauge strip according to claim 2, wherein the first stand is controlled to automatically control the roll gap correction gain factor of the first stand to 2.05 when the roll gap is opened rapidly when the tail of the strip reaches the roll gap.
4. The control method for reducing the rolling break rate of the tail portion of the hot rolled thin gauge strip according to claim 2, wherein the first stand is controlled to have a longest distance of 1.5m from the tail portion of the strip when the first stand is triggered to open the roll gap rapidly when the tail portion of the strip reaches the roll gap.
5. The control method for reducing the rolling break rate of the tail portion of the hot rolled thin gauge strip steel according to claim 1, wherein the second stand is controlled to rapidly open the roll gap when the tail portion of the strip steel reaches the roll gap, the minimum rolling force when the second stand triggers the quick open is 5000KN, the starting minimum triggering proportion of the quick open loop control valve corresponding to the second stand is 80%, the starting maximum using proportion of the quick open loop control valve corresponding to the second stand is 175%, and the minimum roll gap when the second stand triggers the quick open is changed to 0.05mm.
6. The method according to claim 5, wherein the second frame is controlled to automatically control the roll gap correction gain factor to 2 when the second frame opens the roll gap rapidly when the tail of the strip reaches the roll gap.
7. The method according to claim 5, wherein the second frame is controlled to have a maximum distance of 1m from the tail of the strip when the second frame triggers the quick opening when the tail of the strip reaches the gap.
8. The control method for reducing the tail break rate of the hot rolled thin gauge strip according to claim 1, wherein the inlet guide short stroke openings of the second, third, fourth, fifth, sixth and seventh racks are controlled to be 30mm, 70mm, 100mm, 150mm, respectively.
9. The method according to claim 1, wherein the second, third, fourth, fifth, sixth and seventh frames are controlled to have inlet guide short stroke lengths of 5m, 10m, 12m, 18m, 25m, respectively.
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| CN202410226461.4A CN117983669A (en) | 2024-02-29 | 2024-02-29 | Control method for reducing tail breaking rate of hot-rolled thin strip steel |
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| CN202410226461.4A CN117983669A (en) | 2024-02-29 | 2024-02-29 | Control method for reducing tail breaking rate of hot-rolled thin strip steel |
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