CN115433821B - 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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- CN115433821B CN115433821B CN202211052357.5A CN202211052357A CN115433821B CN 115433821 B CN115433821 B CN 115433821B CN 202211052357 A CN202211052357 A CN 202211052357A CN 115433821 B CN115433821 B CN 115433821B
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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
-
- 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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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- 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 by abnormal shutdown of a continuous annealing furnace, which comprises the steps of controlling the heat preservation temperature according to the thickness of the cold-rolled sheet after the shutdown of an annealing furnace area of a continuous annealing unit; and stopping and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace region to 2-3 kN. The advantages are that: the scratch defect generated in the process of producing the cold-rolled sheet by the continuous annealing unit is effectively prevented, the product quality is improved, and the quality cost is reduced. 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 cooling of the cold-rolled sheet can be effectively compensated by controlling corresponding process parameters and taking corresponding process measures, so that the scratch defect caused by the relative movement 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 by abnormal shutdown of a continuous annealing furnace.
Background
The continuous annealing unit in normal production state is not allowed to stop. In the process of producing the cold-rolled sheet, the furnace heating device is stopped immediately after the cold-rolled sheet is stopped under abnormal conditions, and the temperature in the furnace is rapidly reduced, so that the strip steel is contracted and the tension of the cold-rolled sheet is rapidly increased. If the control is not carried out, various problems such as belt breakage, buckling, furnace deformation, furnace roller displacement and the like can be caused. Scratch defects generated by 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 scratch defects in the furnace, and the cold-rolled sheet directly contacts the steel structure and the ground of the inlet and outlet compensating rollers of the continuous annealing furnace after restarting to generate scratch defects, so that normal production is seriously influenced, and cost loss is caused.
In the prior art, patent application number: 201110122216.1A strip steel returning control device after continuous annealing furnace stop is disclosed, wherein a certain strip steel is automatically fed into the furnace after continuous annealing furnace stop, so that accidents such as strip breakage, furnace deformation, furnace roller displacement and the like are prevented.
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 by abnormal shutdown of a continuous annealing furnace, 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 above purpose, the present invention is realized by the following technical scheme:
a method for preventing cold-rolled sheet scratch by abnormal stop of a continuous annealing furnace comprises the steps of controlling the heat preservation temperature according to the thickness of the cold-rolled sheet after the stop of an annealing furnace area of a continuous annealing unit; and stopping and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace region 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 a tension failure on the secondary HMI;
meanwhile, a compensation roller pin lock of an inlet and an outlet of the annealing furnace area is manually opened, and the compensation roller horizontally moves to compensate the shrinkage of the length of the cold-rolled sheet.
After the compensation roller pin lock is manually opened, if the tension in the annealing furnace area still exceeds 50% of the set value, the inlet and outlet loopers are sleeved on a local operation table, so that the shrinkage of the length of the cold-rolled sheet is further compensated.
The heat preservation temperature:
when the thickness of the cold-rolled sheet is less than or equal to 1.5mm and less than or equal to 2.0mm, the heat preservation temperature is controlled at 630-650 ℃;
when the thickness of the cold-rolled sheet is 0.8 mm-1.5 mm, the heat preservation temperature is controlled at 580-620 ℃;
when the thickness of the cold-rolled sheet is less than 0.8mm, the heat preservation temperature is controlled at 530-570 ℃.
The heat preservation temperature is lower than the annealing temperature of the cold-rolled sheet.
Rubber mats are paved on the steel structure and the ground of the compensating roller at the inlet and the outlet of the annealing furnace area.
The horizontal movement distance of the compensating roller is reduced to a set value by the tension in the furnace.
The moving positions of the inlet and outlet loopers are controlled by the tension in the furnace being reduced to the set value.
Compared with the prior art, the invention has the beneficial effects that:
the method effectively prevents scratch defects 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 cooling of the cold-rolled sheet can be effectively compensated by controlling corresponding process parameters and taking corresponding process measures, so that the scratch defect caused by the relative movement between the strip steel and the furnace roller is eliminated. By paving rubber mats on the steel structures and the ground of the inlet and outlet compensating rollers, the defect that the cold-rolled sheet directly contacts the steel structures and the ground of the inlet and outlet compensating rollers of the continuous annealing furnace to scratch after the continuous annealing unit is restarted can be effectively avoided.
Detailed Description
The present invention will be 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 cold-rolled sheet from being scratched by abnormal shutdown of a continuous annealing furnace comprises the following steps:
1) And the annealing furnace area of the continuous annealing unit is stopped, the heat preservation temperature is controlled according to the thickness of the cold-rolled sheet, and the heat preservation temperature is lower than the normal annealing temperature of the cold-rolled sheet, so that the breakage of the cold-rolled sheet caused by the rapid temperature rise after the stop of the cold-rolled sheet is avoided. Specific:
when the thickness of the cold-rolled sheet is smaller than 1.5mm and is smaller 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 sheet 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 simultaneously, 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 generated by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller.
2) And stopping the annealing furnace area of the continuous annealing unit for more than 30 minutes, and increasing and compensating the length shrinkage of the cold-rolled sheet. At this time, operators in the annealing furnace area lose tension in each section on the secondary HMI, and operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the compensating rollers at the inlet and the outlet of the continuous annealing furnace, so that the compensating rollers horizontally move to compensate the contraction of the length of the cold-rolled sheet, the relative movement between the cold-rolled sheet and the furnace rollers is prevented, and the horizontal moving distance of the compensating rollers is reduced to a set value by the tension in the furnace.
3) After the compensation roller pin lock is manually opened, if the tension in the annealing furnace area still exceeds 50% of the set value, the loop is slowly sleeved at the inlet and the outlet on the local operation table, the tension of the strip steel of the loop is reduced, gaps exist between the loop lower roller and the strip steel, the shrinkage of the length of the cold-rolled sheet is further compensated, and the tension in the furnace is reduced to the set value at the inlet and the outlet loop slow moving positions.
4) Rubber mats are paved on the steel structures and the ground of the inlet compensating roller and the outlet compensating roller, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 1
Production varieties: CS A, specification: the tensile process parameters for each section of the annealing furnace zone are shown in table 1 at 1.85 x 1060 mm.
TABLE 1
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Quick cooling section (kN) | Overaging section (kN) | Final cooling segment (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 failure, an operator in the annealing furnace area reduces the normal annealing temperature to 630 ℃ for heat preservation, and strip breakage caused by rapid temperature rise after the strip steel is stopped is avoided. And stopping the machine and simultaneously reducing the tension to 3kN to compensate the length shrinkage caused by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller. And after 20 minutes, eliminating the faults and recovering the annealing furnace of the continuous annealing unit to be normal.
Example 2
Production varieties: ZT2, specification: the tensile process parameters of each section of the annealing furnace area are shown in table 2, with the parameters being 0.82 x 1160 mm.
TABLE 2
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Quick cooling section (kN) | Overaging section (kN) | Final cooling segment (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 failure, operators in the annealing furnace area reduce the normal annealing temperature to 620 ℃ for heat preservation, and the phenomenon that the strip steel is broken due to rapid temperature rise after the stop of the strip steel is avoided. And stopping the machine and simultaneously reducing the tension to 2kN to compensate the length shrinkage caused by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller.
2. When the shutdown time reaches 40 minutes, the length shrinkage of the cold-rolled sheet needs to be increased and compensated. At this time, operators in the annealing furnace area lose tension in each section on the secondary HMI, and operators at the inlet and the outlet of the continuous annealing unit manually open pin locks of compensating rollers at the inlet and the outlet of the continuous annealing unit, so that the compensating rollers horizontally move to compensate the contraction of the length of the cold-rolled sheet, thereby preventing the cold-rolled sheet from generating relative movement with the furnace rollers, and the horizontal moving position of the compensating rollers is reduced to 2kN by the tension in the furnace. And after 60 minutes, eliminating the faults, and recovering the annealing furnace of the continuous annealing unit to work normally.
3. Rubber mats are paved on the steel structures and the ground of the inlet compensating roller and the outlet compensating roller, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 3
Production varieties: SPCC, specification: the tensile process parameters for each section of the annealing furnace zone are shown in table 3 at 0.52 x 960 mm.
TABLE 3 Table 3
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Quick cooling section (kN) | Overaging section (kN) | Final cooling segment (kN) |
| 5.2 | 5.1 | 6.4 | 7.5 | 6.3 | 6.3 |
1. And stopping the annealing furnace area of the continuous annealing unit for 20 minutes due to failure, and reducing the normal annealing temperature of 780 ℃ to 540 ℃ by operators in the annealing furnace area for heat preservation, so that the strip breakage caused by rapid temperature rise of the strip steel after stopping is avoided. And stopping the machine and simultaneously reducing the tension to 2kN to compensate the length shrinkage caused by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller.
2. When the shutdown time reaches 40 minutes, the length shrinkage of the cold-rolled sheet needs to be increased and compensated. At this time, operators in the annealing furnace area lose tension in each section on the secondary HMI, and operators at the inlet and the outlet of the continuous annealing unit manually open pin locks of compensating rollers at the inlet and the outlet of the continuous annealing unit, so that the compensating rollers horizontally move to compensate the contraction of the length of the cold-rolled sheet, thereby preventing the cold-rolled sheet from generating relative movement with the furnace rollers, and the horizontal moving position of the compensating rollers is reduced to 2kN by the tension in the furnace.
3. After the compensation roller pin lock is manually opened, if the tension in the annealing furnace area still exceeds 3kN, an inlet and outlet operator of the continuous annealing unit slowly sleeves the inlet and outlet loopers on a local operation table, the shrinkage of the strip steel length is further compensated, and the movement positions of the inlet and outlet loopers are reduced to 2kN by the tension in the furnace.
4. Rubber pads are paved on the steel structure and the ground (the ground area of the compensating roller frame) of the inlet compensating roller and the outlet compensating roller, so that the cold-rolled sheet is prevented from directly contacting the steel structure and the ground.
Example 4
Production varieties: SPCE, specification: the tensile process parameters for each section of the annealing furnace zone are shown in table 4, 1.02 x 1260 mm.
TABLE 4 Table 4
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Quick cooling section (kN) | Overaging section (kN) | Final cooling segment (kN) |
| 5.9 | 5.9 | 7.5 | 8.7 | 7.3 | 7.3 |
1. And stopping the annealing furnace area of the continuous annealing unit for 20 minutes due to failure, and reducing the normal annealing temperature of 820 ℃ to 580 ℃ by an operator in the annealing furnace area for heat preservation, so that the strip breakage caused by rapid temperature rise of strip steel after stopping is avoided. And stopping the machine and simultaneously reducing the tension to 2.5kN to compensate the length shrinkage caused by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller.
2. When the shutdown time reaches 40 minutes, the length shrinkage of the cold-rolled sheet needs to be increased and compensated. At this time, operators in the annealing furnace area lose tension in each section on the secondary HMI, and operators at the inlet and the outlet of the continuous annealing unit manually open the pin locks of the compensating rollers at the inlet and the outlet of the continuous annealing furnace, so that the compensating rollers horizontally move to compensate the contraction of the length of the cold-rolled sheet, the relative movement between the cold-rolled sheet and the furnace rollers is prevented, and the horizontal moving position of the compensating rollers 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, an inlet and outlet operator of the continuous annealing unit slowly sleeves the inlet and outlet loop on a local operation table, the shrinkage of the strip steel length is further compensated, and the movement positions of the inlet and outlet loop slowly sleeves are reduced to 2.5kN by the tension in the furnace.
4. Rubber mats are paved on the steel structures and the ground of the inlet compensating roller and the outlet compensating roller, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Example 5
Production varieties: st13, specification: the tensile process parameters for each section of the annealing furnace zone are shown in table 5 at 1.64 x 1060 mm.
TABLE 5
| Preheating section (kN) | Heating/soaking (kN) | Slow cooling section (kN) | Quick cooling section (kN) | Overaging section (kN) | Final cooling segment (kN) |
| 8.6 | 8.6 | 10.5 | 11.9 | 10.0 | 10.0 |
1. And stopping the annealing furnace area of the continuous annealing unit for 20 minutes due to failure, and reducing the normal annealing temperature of 800 ℃ to 650 ℃ by operators in the annealing furnace area for heat preservation, so that the strip breakage caused by the rapid temperature rise of the strip steel after the stop is avoided. And stopping the machine and simultaneously reducing the tension to 3kN to compensate the length shrinkage caused by cooling the cold-rolled sheet, thereby eliminating the scratch defect caused by the relative movement between the cold-rolled sheet and the furnace roller.
2. When the shutdown time reaches 40 minutes, the length shrinkage of the cold-rolled sheet needs to be increased and compensated. At this time, operators in the annealing furnace area lose tension in each section on the secondary HMI, and operators at the inlet and the outlet of the continuous annealing unit manually open pin locks of compensating rollers at the inlet and the outlet of the continuous annealing unit, so that the compensating rollers horizontally move to compensate the contraction of the length of the cold-rolled sheet, thereby preventing the cold-rolled sheet from generating relative movement with the furnace rollers, and the horizontal moving position of the compensating rollers is reduced to 3kN by the tension in the furnace.
3. After the compensation roller pin lock is manually opened, if the tension in the annealing furnace area still exceeds 4.5kN, an inlet and outlet operator of the continuous annealing unit slowly sleeves the inlet and outlet loop on a local operation table, the shrinkage of the strip steel length is further compensated, and the movement positions of the inlet and outlet loop slowly sleeves are reduced to 3kN by the tension in the furnace.
4. Rubber mats are paved on the steel structures and the ground of the inlet compensating roller and the outlet compensating roller, so that the cold-rolled sheet is prevented from directly contacting the steel structures and the ground.
Claims (6)
1. A method for preventing a cold-rolled sheet from being scratched by abnormal shutdown of a continuous annealing furnace is characterized in that after the shutdown of an annealing furnace area of a continuous annealing unit, the temperature of the cold-rolled sheet is controlled according to the thickness of the cold-rolled sheet; stopping and simultaneously reducing the set value of the tension of each section of the continuous annealing furnace region 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 a tension failure on the secondary HMI;
meanwhile, a compensation roller pin lock of an inlet and an outlet of the annealing furnace area is manually opened, and the compensation roller horizontally moves to compensate the shrinkage of the length of the cold-rolled sheet;
the heat preservation temperature:
when the thickness of the cold-rolled sheet is less than or equal to 1.5mm and less than or equal to 2.0mm, the heat preservation temperature is controlled at 630-650 ℃;
when the thickness of the cold-rolled sheet is 0.8 mm-1.5 mm, the heat preservation temperature is controlled at 580-620 ℃;
when the thickness of the cold-rolled sheet is less than 0.8mm, the heat preservation temperature is controlled at 530-570 ℃.
2. The method for preventing cold-rolled sheet from being scratched by abnormal shutdown of a continuous annealing furnace according to claim 1, wherein after the compensating roll pin lock is manually opened, if the tension of the annealing furnace area still exceeds 50% of the set value, the inlet and outlet loopers are sleeved on a local operation table to further compensate the shrinkage of the length of the cold-rolled sheet.
3. The method for preventing the cold-rolled sheet from being scratched by abnormal shutdown of the continuous annealing furnace according to claim 1, wherein the heat preservation temperature is lower than the annealing temperature of the cold-rolled sheet.
4. The method for preventing scratch of cold-rolled sheet by abnormal shutdown of continuous annealing furnace according to claim 1, wherein rubber mats are laid on the steel structure and the ground of the compensating rolls at the inlet and outlet of the annealing furnace region.
5. The method for preventing a cold-rolled sheet from being scratched by abnormal shut-down of a continuous annealing furnace according to claim 1, wherein the horizontal movement distance of the compensating roll is reduced to a set value by the tension in the furnace.
6. The method for preventing cold-rolled sheet from being scratched by abnormal stop of continuous annealing furnace according to claim 2, wherein the moving positions of the inlet and outlet loopers are controlled by lowering the tension in the furnace to a set value.
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