CN115433821A - Method for preventing cold-rolled sheet from being scratched by abnormal shutdown of continuous annealing furnace - Google Patents
Method for preventing cold-rolled sheet from being scratched by abnormal shutdown of continuous annealing furnace Download PDFInfo
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- CN115433821A CN115433821A CN202211052357.5A CN202211052357A CN115433821A CN 115433821 A CN115433821 A CN 115433821A CN 202211052357 A CN202211052357 A CN 202211052357A CN 115433821 A CN115433821 A CN 115433821A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped.A heat preservation temperature is controlled according to the thickness of the cold-rolled sheet after an annealing furnace area of a continuous annealing unit is stopped; and stopping the continuous annealing furnace and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace area to 2-3 kN. The advantages are that: effectively preventing the scratch defect generated in the process of producing the cold-rolled sheet by the continuous annealing unit, improving the product quality and reducing the quality cost. According to the method, according to the abnormal shutdown time of the annealing furnace area of the continuous annealing unit caused by various faults, the length shrinkage caused by the cooling of the cold-rolled sheet can be effectively compensated by controlling corresponding process parameters and adopting corresponding process measures, so that the scratch defect caused by the relative motion between the strip steel and the furnace roller is eliminated.
Description
Technical Field
The invention relates to a method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped.
Background
The continuous annealing unit under the normal production state is not allowed to stop. In the process of producing the cold-rolled sheet, the furnace is stopped under abnormal conditions, after the furnace is stopped, the heating device of the furnace is immediately stopped, the temperature in the furnace is rapidly reduced, and the tension of the cold-rolled sheet is rapidly increased due to the shrinkage of the strip steel. If not controlled, the problems of belt breakage, buckling, furnace deformation, furnace roller displacement and the like can be caused. Scratch defects generated in the cold-rolled sheet in the process are always main factors influencing the yield of the cold-rolled sheet.
The cold-rolled sheet is cooled and contracted to generate relative motion with the furnace roller to cause the scratch defect in the furnace, and the cold-rolled sheet directly contacts the steel structure of the inlet and outlet compensating rollers of the continuous annealing furnace and the ground to generate the scratch defect after the cold-rolled sheet is restarted, thereby seriously influencing the normal production and causing the cost loss.
In the prior art, patent application No.: 201110122216.1 discloses a strip steel loopback control device after a continuous annealing furnace stops, which adopts the method that certain strip steel is automatically sent into the furnace after the continuous annealing furnace stops so as to prevent accidents such as strip breakage, furnace deformation, furnace roller displacement and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped, so that the scratch defect generated in the process of producing the cold-rolled sheet by a continuous annealing unit is prevented, and the product quality and the yield are improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped is disclosed, wherein after the annealing furnace area of a continuous annealing unit is stopped, the heat preservation temperature is controlled according to the thickness of the cold-rolled sheet; and stopping the continuous annealing furnace and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace to 2-3 kN.
Stopping the annealing furnace area of the continuous annealing unit for more than 30 minutes, and setting the annealing furnace area as tension loss on the secondary HMI;
meanwhile, the compensation roll pin locks at the inlet and the outlet of the annealing furnace area are manually opened, and the compensation roll horizontally moves to compensate the shrinkage of the length of the cold-rolled sheet.
After the compensation roll pin lock is manually opened, if the tension of the annealing furnace area still exceeds the set value by 50%, the inlet loop and the outlet loop are sleeved slowly at a local operating platform, and the shrinkage of the length of the cold-rolled sheet is further compensated.
The heat preservation temperature is as follows:
when the thickness of the cold-rolled plate is more than 1.5mm and less than or equal to 2.0mm, the heat preservation temperature is controlled to be 630-650 ℃;
when the thickness of the cold-rolled plate is 0.8 mm-1.5 mm, the heat preservation temperature is controlled at 580-620 ℃;
when the thickness of the cold-rolled plate is less than 0.8mm, the heat preservation temperature is controlled to be 530-570 ℃.
The heat preservation temperature is lower than the annealing temperature of the cold-rolled sheet.
And (3) paving rubber mats on the steel structure and the ground of the compensating rollers at the inlet and the outlet of the annealing furnace area.
The horizontal moving distance of the compensating roller is reduced to the set value by the tension in the furnace.
The moving positions of the inlet and outlet loop buffer sleeves are based on that the tension in the furnace is reduced to a set value.
Compared with the prior art, the invention has the beneficial effects that:
the method effectively prevents the scratch defect generated in the process of producing the cold-rolled sheet by the continuous annealing unit, improves the product quality and reduces the quality cost. According to the method, according to the abnormal shutdown time of the annealing furnace area of the continuous annealing unit caused by various faults, the length shrinkage caused by the cooling of the cold-rolled sheet can be effectively compensated by controlling corresponding process parameters and adopting corresponding process measures, so that the scratch defect caused by the relative motion between the strip steel and the furnace roller is eliminated. The rubber mats are paved on the steel structures of the inlet compensating roller and the outlet compensating roller and the ground, so that the defect that the cold-rolled sheet directly contacts the steel structures of the inlet compensating roller and the outlet compensating roller and the ground of the continuous annealing furnace to scratch after the continuous annealing unit is restarted can be effectively avoided.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped comprises the following steps:
1) And stopping the annealing furnace area of the continuous annealing unit, controlling the heat preservation temperature according to the thickness of the cold-rolled sheet, wherein the heat preservation temperature is lower than the normal annealing temperature of the cold-rolled sheet, and avoiding the breakage of the cold-rolled sheet caused by the sharp rise of the temperature after the stop. Specifically, the method comprises the following steps:
when the thickness of the cold-rolled plate is more than 1.5mm and less than or equal to 2.0mm, the normal annealing temperature is 780-820 ℃, and the heat preservation temperature is controlled at 630-650 ℃;
when the thickness of the cold-rolled plate is 0.8 mm-1.5 mm, the normal annealing temperature is 780-820 ℃, and the heat preservation temperature is controlled at 580-620 ℃;
when the thickness of the cold-rolled sheet is less than 0.8mm, the normal annealing temperature is 780-820 ℃, and the heat preservation temperature is controlled at 530-570 ℃;
and stopping the continuous annealing furnace and reducing the tension of each section of the continuous annealing furnace to 2-3 kN so as to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller.
2) The annealing furnace area of the continuous annealing unit is stopped for more than 30 minutes, and the length shrinkage of the compensation cold-rolled sheet needs to be increased. At the moment, operators in the annealing furnace area lose tension of all sections on the secondary HMI, and simultaneously operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the inlet and the outlet compensating rolls of the continuous annealing furnace, so that the compensating rolls move horizontally, the contraction of the length of the cold-rolled sheet is compensated, the relative motion between the cold-rolled sheet and the furnace rolls is prevented, and the horizontal moving distance of the compensating rolls is reduced to a set value by the tension in the furnace.
3) After the compensation roll pin lock is manually opened, if the tension of the annealing furnace area still exceeds the set value by 50%, the loop at the inlet and the loop at the outlet are slowly sleeved on the local operating platform, the tension of the strip steel of the loop is reduced, a gap exists between the lower roll of the loop and the strip steel, the shrinkage of the length of the cold-rolled sheet is further compensated, and the moving positions of the loop at the inlet and the outlet are reduced to the set value by the tension in the furnace.
4) And rubber pads are paved on the steel structures of the inlet and outlet compensating rollers and the ground, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 1
Producing varieties: CS A, specification: 1.85 x 1060mm, tension process parameters for each section of the annealing furnace zone as in table 1.
TABLE 1
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Rapid cooling section (kN) | Overaging stage (kN) | Final cooling section (kN) |
| 10.2 | 10.2 | 12.8 | 14.1 | 12.0 | 12.0 |
The annealing furnace area of the continuous annealing unit is stopped due to faults, operators in the annealing furnace area reduce the normal annealing temperature to 780 ℃ to 630 ℃ for heat preservation, and strip breakage caused by rapid temperature rise of strip steel after the strip steel is stopped is avoided. And the tension is reduced to 3kN while the furnace is stopped so as to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller. And after 20 minutes, the fault is eliminated, and the annealing furnace of the continuous annealing unit is recovered to be normal.
Example 2
Producing varieties: ZT2, specification: 0.82 x 1160mm, and the tension process parameters of each section of the annealing furnace zone are shown in the table 2.
TABLE 2
| Preheating section(kN) | Heating/soaking (kN) | Slow cooling section (kN) | Rapid cooling section (kN) | Overaging stage (kN) | Final cooling section (kN) |
| 6.7 | 6.6 | 8.2 | 9.5 | 7.7 | 7.7 |
1. The annealing furnace area of the continuous annealing unit is stopped due to faults, operators in the annealing furnace area reduce the normal annealing temperature of 800 ℃ to 620 ℃ for heat preservation, and strip breakage caused by rapid temperature rise of strip steel after the strip steel is stopped is avoided. And the tension is reduced to 2kN while the furnace is stopped so as to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller.
2. When the stop time reaches 40 minutes, the length shrinkage of the compensation cold-rolled sheet needs to be increased. At the moment, operators in the annealing furnace area lose tension of all sections on the secondary HMI, and simultaneously, the operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the compensating rolls at the inlet and the outlet of the continuous annealing furnace, so that the compensating rolls move horizontally, the contraction of the length of the cold-rolled sheet is compensated, the relative motion between the cold-rolled sheet and the furnace rolls is prevented, and the horizontal moving position of the compensating rolls reduces the tension in the furnace to 2 kN. And after 60 minutes, the fault is eliminated, and the annealing furnace of the continuous annealing unit is recovered to work normally.
3. And rubber pads are paved on the steel structures of the inlet and outlet compensating rollers and the ground, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 3
Producing varieties: SPCC, specification: 0.52 x 960mm, the tension process parameters for each section of the annealing furnace zone are as in table 3.
TABLE 3
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Rapid cooling section (kN) | Overaging stage (kN) | Final cooling section (kN) |
| 5.2 | 5.1 | 6.4 | 7.5 | 6.3 | 6.3 |
1. The annealing furnace area of the continuous annealing unit is stopped for 20 minutes due to faults, operators in the annealing furnace area reduce the normal annealing temperature of 780 ℃ to 540 ℃ for heat preservation, and strip breakage caused by rapid temperature rise of the strip steel after the strip steel is stopped is avoided. And stopping the furnace, and reducing the tension to 2kN to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller.
2. When the stop time reaches 40 minutes, the length shrinkage of the compensation cold-rolled sheet needs to be increased. At the moment, operators in the annealing furnace area lose tension of all sections on the secondary HMI, and simultaneously, the operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the compensating rolls at the inlet and the outlet of the continuous annealing furnace, so that the compensating rolls move horizontally, the contraction of the length of the cold-rolled sheet is compensated, the relative motion between the cold-rolled sheet and the furnace rolls is prevented, and the horizontal moving position of the compensating rolls reduces the tension in the furnace to 2 kN.
3. After the compensation roller pin lock is manually opened, if the tension of the annealing furnace area still exceeds 3kN, the inlet and outlet operators of the continuous annealing unit slowly sleeve the inlet and outlet loops on a local operating platform to further compensate the shrinkage of the length of the strip steel, and the moving positions of the inlet and outlet loop slow sleeves are reduced to 2kN by the tension in the furnace.
4. And rubber pads are paved on the steel structures of the inlet and outlet compensating rolls and the ground (the ground area of the compensating roll frame), so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 4
Producing varieties: SPCE, specification: 1.02 × 1260mm, and the tension process parameters for each section of the annealing furnace region are as shown in table 4.
TABLE 4
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Rapid cooling section (kN) | Overaging stage (kN) | Final cooling section (kN) |
| 5.9 | 5.9 | 7.5 | 8.7 | 7.3 | 7.3 |
1. The annealing furnace area of the continuous annealing unit is stopped for 20 minutes due to faults, and operators in the annealing furnace area reduce the normal annealing temperature from 820 ℃ to 580 ℃ for heat preservation, so that strip breakage caused by rapid temperature rise after the strip steel is stopped is avoided. And the tension is reduced to 2.5kN while the furnace is stopped so as to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller.
2. When the stop time reaches 40 minutes, the length shrinkage of the compensation cold-rolled sheet needs to be increased. At the moment, operators in the annealing furnace area lose tension of all sections on the secondary HMI, and simultaneously operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the inlet and the outlet compensating rolls of the continuous annealing furnace, so that the compensating rolls move horizontally, the contraction of the length of the cold-rolled sheet is compensated, the relative motion between the cold-rolled sheet and the furnace rolls is prevented, and the horizontal moving position of the compensating rolls is reduced to 2.5kN by the tension in the furnace.
3. After the compensating roll pin lock is manually opened, if the tension of the annealing furnace area still exceeds 3.75kN, the inlet and outlet operators of the continuous annealing unit slowly sleeve the inlet and outlet loops at a local operating platform, further compensate the shrinkage of the length of the strip steel, and move the positions of the inlet and outlet loop slow sleeves until the tension in the furnace is reduced to 2.5 kN.
4. And rubber pads are paved on the steel structures of the inlet and outlet compensating rollers and the ground, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 5
Producing varieties: st13, specification: 1.64 by 1060mm, and the tension process parameters for each section of the annealing furnace zone are shown in table 5.
TABLE 5
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Rapid cooling section (kN) | Overaging stage (kN) | Final cooling section (kN) |
| 8.6 | 8.6 | 10.5 | 11.9 | 10.0 | 10.0 |
1. The annealing furnace area of the continuous annealing unit is stopped for 20 minutes due to faults, operators in the annealing furnace area reduce the normal annealing temperature of 800 ℃ to 650 ℃ for heat preservation, and strip breakage caused by rapid temperature rise of the strip steel after the strip steel is stopped is avoided. And the tension is reduced to 3kN while the furnace is stopped so as to compensate the length shrinkage caused by the cooling of the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative motion between the cold-rolled sheet and the furnace roller.
2. When the stop time reaches 40 minutes, the length shrinkage of the compensation cold-rolled sheet needs to be increased. At the moment, operators in the annealing furnace area lose tension of all sections on the secondary HMI, and simultaneously, the operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the compensating rolls at the inlet and the outlet of the continuous annealing furnace to enable the compensating rolls to move horizontally, compensate the contraction of the length of the cold-rolled sheet, prevent the relative motion between the cold-rolled sheet and the furnace rolls, and reduce the horizontal moving position of the compensating rolls to 3kN with the tension in the furnace.
3. After the compensation roll pin lock is manually opened, if the tension of the annealing furnace area still exceeds 4.5kN, the inlet and outlet operators of the continuous annealing unit slowly sleeve the inlet and outlet loops on a local operating platform, further compensate the shrinkage of the length of the strip steel, and move the positions of the inlet and outlet loop slow sleeves until the tension in the furnace is reduced to 3kN.
4. And rubber pads are paved on the steel structures of the inlet and outlet compensating rollers and the ground, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Claims (8)
1. A method for preventing a cold-rolled sheet from being scratched when a continuous annealing furnace is abnormally stopped is characterized in that after the annealing furnace area of a continuous annealing unit is stopped, the heat preservation temperature is controlled according to the thickness of the cold-rolled sheet; and stopping the continuous annealing furnace and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace area to 2-3 kN.
2. The method for preventing cold-rolled sheet scratching through abnormal shutdown of a continuous annealing furnace according to claim 1, characterized in that the annealing furnace area of the continuous annealing unit is shut down for more than 30 minutes, and the annealing furnace area is set to be tension-lost on a secondary HMI;
meanwhile, the compensation roll pin locks at the inlet and the outlet of the annealing furnace area are manually opened, and the compensation roll horizontally moves to compensate the shrinkage of the length of the cold-rolled sheet.
3. The method of claim 2, wherein after the compensation roll pin lock is manually opened, if the tension in the annealing furnace zone still exceeds the set value by 50%, the entrance and exit loops are jogged at the local station to further compensate for the shrinkage in the length of the cold-rolled sheet.
4. The method for preventing the scratch of the cold-rolled sheet during the abnormal shutdown of the continuous annealing furnace according to claim 1, wherein the heat preservation temperature is as follows:
when the thickness of the cold-rolled plate is more than 1.5mm and less than or equal to 2.0mm, the heat preservation temperature is controlled to be 630-650 ℃;
when the thickness of the cold-rolled plate is 0.8 mm-1.5 mm, the heat preservation temperature is controlled at 580-620 ℃;
when the thickness of the cold-rolled plate is less than 0.8mm, the heat preservation temperature is controlled to be 530-570 ℃.
5. The method for preventing cold-rolled sheet from being scratched when the continuous annealing furnace is abnormally stopped according to claim 1, wherein the holding temperature is lower than the annealing temperature of the cold-rolled sheet.
6. The method for preventing the scratching of the cold-rolled sheet during the abnormal stop of the continuous annealing furnace according to claim 1, wherein rubber pads are laid on the steel structure of the compensating rolls at the inlet and outlet of the annealing furnace area and the ground.
7. The method for preventing cold-rolled sheet from being scratched when the continuous annealing furnace is abnormally stopped according to claim 2, wherein the compensating roll is horizontally moved by a distance until the tension in the furnace is lowered to a set value.
8. The method of claim 3, wherein the moving positions of the inlet and outlet loop buffer are based on the tension in the furnace being reduced to a predetermined value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116162854A (en) * | 2023-02-24 | 2023-05-26 | 中北大学 | Method for preventing strip breakage in wide iron-chromium-aluminum alloy hot rolled steel coil annealing furnace |
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| CN116162854A (en) * | 2023-02-24 | 2023-05-26 | 中北大学 | Method for preventing strip breakage in wide iron-chromium-aluminum alloy hot rolled steel coil annealing furnace |
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