CN113801988A - Method for eliminating furnace roller nodulation - Google Patents

Method for eliminating furnace roller nodulation Download PDF

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CN113801988A
CN113801988A CN202111216884.0A CN202111216884A CN113801988A CN 113801988 A CN113801988 A CN 113801988A CN 202111216884 A CN202111216884 A CN 202111216884A CN 113801988 A CN113801988 A CN 113801988A
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furnace roller
furnace
roller
temperature
nodules
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CN113801988B (en
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刘瑞龙
张鑫
孙建华
刘金刚
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Beijing Shougang Cold Rolled Sheet Co Ltd
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Beijing Shougang Cold Rolled Sheet Co Ltd
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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
    • C21D9/562—Details
    • C21D9/563—Rolls; Drums; Roll arrangements
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/008—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using fluids or gases, e.g. blowers, suction units
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention discloses a method for eliminating furnace roller nodulation, which comprises the steps of determining the position of a furnace roller with nodulation in a continuous annealing furnace; adjusting the temperature of the furnace roller with the determined nodules to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller; and (3) placing the grinding roller strip steel on the low-temperature furnace roller of the continuous annealing furnace, rotating the low-temperature furnace roller for 0.3-0.5 circle at the linear speed of more than 30mpm, and stopping rotating to remove the roller surface nodules of the low-temperature furnace roller. The method can effectively remove the stubborn nodules on the furnace roller, and the surface qualification rate of the strip steel produced by the furnace roller is 100 percent.

Description

Method for eliminating furnace roller nodulation
Technical Field
The invention belongs to the technical field of continuous annealing furnace production, and particularly relates to a method for eliminating furnace roller nodules.
Background
Continuous annealing is required in the production process of the strip steel, the continuous annealing furnace is the most important equipment of a continuous annealing line, and the internal structure of the strip steel is changed through the annealing furnace, so that the process requirement is met. The requirements on properties and surface quality are therefore extremely high. Because the surface of the strip steel entering the furnace cannot achieve the effect of 100 percent of cleanliness, and moreover, the strip steel generates some chemical reactions in the furnace, dirt on the surface of the strip steel is adhered to the roller to be expressed, and small 'nodules' are formed. Because the annealing furnace consists of a plurality of groups of rollers, the annealing furnace is sealed in the furnace for a long time, and if the annealing furnace is not used, the annealing furnace can be copied to the surface of the strip steel to generate batch punch marks. In addition, because the annealing furnace is sealed, has high temperature and runs at high speed, the treatment difficulty is very high, and great potential safety hazard exists.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for eliminating furnace roller nodules, which can remove stubborn nodules on a furnace roller of a continuous annealing furnace, avoid pit formation on strip steel and improve the surface quality of the strip steel.
The technical scheme of the invention is as follows:
the invention provides a method for eliminating furnace roller nodulation, which comprises the following steps:
determining the position of the furnace roller with the nodules in the continuous annealing furnace;
adjusting the temperature of the furnace roller with the nodules at the determined position to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and simultaneously introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller;
and (3) placing the grinding roller strip steel on the low-temperature furnace roller of the continuous annealing furnace, rotating the low-temperature furnace roller for 0.3-0.5 circle at the linear speed of more than 30mpm, and stopping rotating to remove the roller surface nodules of the low-temperature furnace roller.
Further, the linear speed of the rotation of the low-temperature furnace roller is 25-35 mpm.
Further, the temperature reduction rate is 8-12 ℃/min, and the temperature of the low-temperature furnace roller is 500-600 ℃.
Further, the volume fraction of hydrogen in the reducing gas is 8-12%.
Furthermore, the method for adjusting the temperature of the furnace roller with the nodules comprises the following steps: the nodular furnace rolls were run at a rate of 100-150mpm using cold rolled steel strip at a temperature of 25-40 ℃.
Further, the position of the furnace roller with the determined nodules in the continuous annealing furnace comprises,
determining a first process section of the cold-rolled strip steel with a pit in a continuous annealing furnace;
performing deviation rectification treatment on the cold-rolled strip steel running on the process section before the determined first process section;
and if the position of the pit in the width direction of the cold-rolled strip steel is changed through deviation rectifying treatment, determining the position of a furnace roller with a nodule in the previous process section of the first process section.
Furthermore, in the deviation rectifying process, the deviation rectifying amount is 20-50 mm.
Further, in the deviation rectifying process, the running speed of the cold-rolled strip steel is 150-180 mpm.
Further, in the deviation rectifying process, the temperature of the cold-rolled strip steel is 580-620 ℃.
Further, the width of the grinding roller strip steel is 900-1250mm, and the thickness of the grinding roller strip steel is 0.3-2.0 mm.
The beneficial effects of the invention at least comprise:
the invention provides a method for eliminating furnace roller nodulation, which comprises the steps of determining the position of a furnace roller with the nodulation in a continuous annealing furnace; adjusting the temperature of the furnace roller with the determined nodules to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller; and (3) placing the grinding roller strip steel on the low-temperature furnace roller of the continuous annealing furnace, rotating the low-temperature furnace roller for 0.3-0.5 circle at the linear speed of more than 30mpm, and stopping rotating to remove the roller surface nodules of the low-temperature furnace roller. The furnace roller and the accretion generate different shrinkage amounts by controlling the higher cooling rate of the furnace roller, so that the bonding force of the accretion and the furnace roller is reduced; reducing gas is introduced at the temperature of not more than 600 ℃ to reduce iron oxide in the nodules into iron, so that the nodules are looser, and the binding force between the nodules and the furnace roller is weakened; on the basis of reducing the binding force between the accretions and the furnace roller by the physical method and the chemical method, the furnace roller is rotated in a inching mode, so that the friction force is generated between the dynamic furnace roller and the static grinding roller strip steel, and the stubborn accretions on the furnace roller are removed.
Drawings
FIG. 1 is a process diagram of a method for eliminating furnace roller nodules according to this embodiment.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
Continuous annealing stove is including the preheating section that sets gradually, the heating section, the soaking section, the slow cooling section, the fast cooling section, the overaging section, the end cooling section, belted steel is in continuous annealing stove annealing process, can bring impurity such as iron fillings into, under high temperature, impurity is stained with on the stove roller, and grow gradually, form the nodule, at stove roller operation in-process, the nodule can contact with belted steel, thereby appear the pit on belted steel, and simultaneously, belted steel still exerts pressure to the direction of stove roller with the nodule, make the cohesion of nodule and stove roller stronger, form stubborn nodule.
Fig. 1 is a process diagram of a method for eliminating furnace roller nodules according to an embodiment of the present invention, and with reference to fig. 1, the method for eliminating furnace roller nodules according to an embodiment of the present invention includes:
s1, determining the position of the furnace roller with the nodules in the continuous annealing furnace;
as an embodiment of the present invention, the position of the furnace roller with the nodules in the continuous annealing furnace may be determined by a method, specifically including,
s110, determining a first process section of the cold-rolled strip steel with the pit in the continuous annealing furnace;
s120, performing deviation rectification treatment on the cold-rolled strip steel running on the previous process section of the determined first process section;
the deviation rectifying treatment refers to that the strip steel on the furnace roller swings towards the width direction of the strip steel in the advancing process, so that different positions of the width direction of the strip steel can be in contact with the furnace roller, if a nodule is arranged at the middle position of the furnace roller in the axial direction, the nodule can be pressed into the strip steel in contact with the middle position of the furnace roller in the axial direction, if the strip steel is subjected to deviation rectifying, the middle position of the furnace roller in the axial direction can be in contact with the edge position of the strip steel in the width direction, the pit position of the strip steel after deviation rectifying can be checked to be moved to the edge position of the strip steel from the middle position of the width direction of the strip steel, and if the pit changes in the position of the strip steel in the width direction, the strip steel on the furnace roller surface of the process section subjected to deviation rectifying treatment is indicated to have the nodule.
As an implementation manner of the embodiment of the invention, in the deviation rectifying process, the deviation rectifying amount is 20-50 mm.
The too large deviation correcting amount can cause the edge scraping problem of the cold-rolled strip steel used for deviation correction, and the too small deviation correcting amount can make the position change of the pit difficult to observe.
As an implementation manner of the embodiment of the invention, in the deviation rectifying process, the running speed of the cold-rolled strip steel is 150-180 mpm.
The cold-rolled strip steel is in a normal temperature state before deviation correction, the furnace temperature in the continuous annealing furnace is 800-900 ℃, and the cooling rate in the continuous annealing furnace can be controlled by controlling the running rate of the cold-rolled strip steel, so that the binding force between nodules and the roll surface is reduced. The cold-rolled strip steel has too low running speed and low cooling speed, and the binding force between the nodules and the roll surface is difficult to weaken. Where mpm is the unit of rate, representing m/min. In addition, the correction treatment can also remove the nodules with weaker bonding force with the roll surface.
As an implementation manner of the embodiment of the invention, in the deviation rectifying process, the temperature of the cold-rolled strip steel is 580-620 ℃.
S130, if the position of the pit in the width direction of the cold-rolled strip steel is changed through deviation rectifying treatment, determining that the former process section of the determined first process section is the position of the furnace roller with the nodules.
S2, adjusting the temperature of the furnace roller with the nodules at the determined position to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller;
because the expansion coefficients of the accretion and the furnace roller are different, the temperature reduction rate of the furnace roller with the accretion is controlled, so that cracks can be generated between the accretion and the furnace roller during cooling, and the binding force of the accretion and the roller surface of the furnace roller is reduced. The atmosphere in the annealing furnace can be updated by introducing the reducing gas, so that impurities to be adhered to the furnace roller are effectively discharged, and new nodules are prevented from being generated.
As an implementation manner of the embodiment of the invention, the temperature reduction rate is 10-15 ℃/min, and the temperature of the low-temperature furnace roller is 500-.
The cooling speed of the furnace roller cannot be too high, otherwise the roller shape of the furnace roller is changed, and the strip steel is easy to deviate in the annealing process of the strip steel, so that the furnace wall is scraped; the cooling speed of the furnace roller cannot be too slow, otherwise, the effect of reducing the binding force between the accretion and the furnace roller by expansion with heat and contraction with cold cannot be achieved.
The temperature of the low-temperature furnace roller cannot be too low, and if the temperature of the low-temperature furnace roller is too low, the temperature reduction amplitude of the continuous annealing furnace is too large, so that the service life of equipment can be shortened; the low-temperature furnace roller has too high temperature and cannot achieve the effect of removing the nodules by hot rolling and cold shrinking.
As an implementation of the embodiment of the invention, the volume fraction of hydrogen in the reducing gas is 8-12%.
The reducing gas containing hydrogen is introduced, and the hydrogen and the ferric oxide in the accretion can be subjected to reduction reaction by matching the temperature, so that the binding force between the accretion and the roller surface of the furnace roller is reduced.
The main components in the nodulation are ferric oxide and ferroferric oxide, the temperature is 800-900 ℃ in the continuous annealing process, the volume fraction of hydrogen is 1.5-2% in the temperature range, the volume fraction is low, the hydrogen can be used as protective gas to prevent strip steel from being oxidized but is not enough to react with the nodulation, but the hydrogen can chemically react with the ferric oxide and the ferroferric oxide in the nodulation at the temperature of 500-600 ℃ to generate iron, so that the binding force between the nodulation and the roller surface is weakened. The reaction formula is as follows:
Fe2O3+3H2＝2Fe+3H2O
4H2+Fe3O4＝3Fe+4H2O
as an embodiment of the present invention, a method of adjusting the temperature of the accreted furnace roller is: the nodular furnace rolls were run at a rate of 100-150mpm using cold rolled steel strip at a temperature of 25-40 ℃.
S3, the grinding roller strip steel is placed on the low-temperature furnace roller of the continuous annealing furnace, and the low-temperature furnace roller is rotated for 0.3-0.5 circle at the linear speed of more than 30mpm and then stops rotating to remove the roller surface nodules of the low-temperature furnace roller.
The rotation mode of the low-temperature furnace roller can be realized by inching, the instantaneous rotation impulse is large, the low-temperature furnace roller is originally static and can generate strong sliding friction with the rotating low-temperature furnace roller under the action of inertia, so that old knots can be rubbed off, in actual operation, after the low-temperature furnace roller is started to rotate, the grinding roller strip steel can be bent and cannot be straightened, at the moment, the grinding roller strip steel can be tensioned, the step of S3 is repeated after the tension is released, and the repetition times can be adjusted according to the effect.
As an implementation mode of the embodiment of the invention, the rotating linear speed of the low-temperature furnace roller is 25-35 mpm.
The higher the instantaneous rotation linear speed is, the more easily the nodules are ground, but the rotation linear speed is too high, and the effect is not obvious.
As an implementation mode of the embodiment of the invention, the width of the strip steel is 900-1250mm, and the thickness of the strip steel is 0.3-2.0 mm.
The method for eliminating the accretion of the furnace roller according to the present invention will be described in detail with reference to specific examples.
Example 1
Embodiment 1 provides a method for eliminating furnace roller nodules, which comprises the following steps:
1. and (3) finding that the pit is arranged on the lower surface of the strip steel of the soaking section in the continuous annealing furnace, arranging a return coil with the width of 1250mm and the thickness of 1.0mm into the continuous annealing furnace, and performing deviation rectification treatment on the return coil of the heating section, wherein the deviation rectification amount is 25mm, and the running speed of the return coil is 150 mpm.
In the deviation rectifying process, the pit of the return coil is found to move to two sides from the middle position in the width direction of the return coil, and the furnace roller of the heating section is confirmed to have the nodulation.
2. To the furnace roller cooling of heating section, specifically do: the temperature of the furnace roller is reduced from 850 ℃ to 550 ℃ within 10min by using a return coil with the temperature of 30 ℃, and the running speed of the return coil is 150mpm in the process of reducing the temperature.
3. And (3) in the cooling process of the step (2), introducing reducing gas into the heating section, wherein in the reducing gas, the volume fraction of hydrogen is 10%, and the volume fraction of nitrogen is 90%, so that a large amount of hydrogen and nodules are subjected to comprehensive chemical reaction.
4. The heating zone furnace roller was stopped to bring the return coil to rest and then jogged to rotate the furnace roller at 28mpm for half a revolution.
5. And (4) crawling the returned coiled sheets processed in the step (4) for 200m, then unloading the sheets and standing, and repeating the step (4).
Example 2
Embodiment 2 provides a method for eliminating accretion on a furnace roller, which comprises the following steps:
1. and (3) finding that the lower surface of the strip steel of the fast cooling section in the continuous annealing furnace is provided with a pit, arranging a return coil with the width of 1250mm and the thickness of 1.0mm into the continuous annealing furnace, and performing deviation rectification treatment on the return coil of the slow cooling section, wherein the deviation rectification amount is 38mm, and the running speed of the return coil is 170 mpm.
In the deviation rectifying process, the pit of the return coil is found to move to two sides from the middle position of the width direction of the return coil, and the furnace roller of the slow cooling section is confirmed to have the nodulation.
2. And (3) cooling the furnace roller in the continuous annealing furnace of the slow cooling section, specifically, using a return coil with the temperature of 30 ℃, cooling the furnace roller from 900 ℃ to 500 ℃ within 10min, wherein the running speed of the return coil is 150mpm in the cooling process.
3. And (3) in the cooling process of the step 2, introducing reducing gas into the slow cooling section, wherein in the reducing gas, the volume fraction of hydrogen is 12%, and the volume fraction of nitrogen is 88%, so that a large amount of hydrogen and nodules are subjected to comprehensive chemical reaction.
4. The slow chill section furnace roller was stopped to bring the return coil to rest and was then indexed to rotate the furnace roller half a revolution at 30 mpm.
5. And (4) crawling the returned coiled sheets processed in the step (4) for 200m, then unloading the sheets and standing, and repeating the step (4).
Example 3
Embodiment 3 provides a method for eliminating furnace roller nodules, which comprises the following steps:
1. and (3) finding that the lower surface of the over-aging section strip steel in the continuous annealing furnace is provided with a pit, arranging a return coil with the width of 1120mm and the thickness of 1.2mm into the continuous annealing furnace, and performing deviation rectification treatment on the return coil of the fast cooling section, wherein the deviation rectification amount is 45mm, and the running speed of the return coil is 160 mpm.
In the deviation rectifying process, the pit of the return coil is found to move to two sides from the middle position in the width direction of the return coil, and the furnace roller of the fast cooling section is confirmed to have the nodulation.
2. To the furnace roller cooling of fast cold section, specifically do: and (3) reducing the temperature of the furnace roller from 860 ℃ to 530 ℃ within 8min by using a return coil with the temperature of 30 ℃, wherein the running speed of the return coil is 180mpm in the temperature reduction process.
3. And (3) in the cooling process of the step (2), introducing reducing gas into the confirmed heating process section, wherein in the reducing gas, the volume fraction of hydrogen is 9%, and the volume fraction of nitrogen is 91%, so that a large amount of hydrogen and nodules are subjected to comprehensive chemical reaction.
4. The heated process section furnace rolls were stopped to bring the return coil to rest and then jogged to rotate the furnace rolls half a turn at 33 mpm.
5. And (4) crawling the returned coiled sheets processed in the step (4) for 200m, then unloading the sheets and standing, and repeating the step (4).
Comparative example 1
Comparative example 1 provides a method for removing a roll surface nodule, specifically: to strip steel in annealing furnacesPerforming deviation correction treatment, and then periodically changing the running speed of the strip steel at 170-200m/min, wherein the acceleration during the acceleration and the deceleration is 0.05m/s2。
TABLE 1
Figure BDA0003311025340000061
The pit strip steel before being treated in the examples 1 to 3 is observed, the average pit depth size is 43-78 μm, the average pit length size is 350-400 μm, the annealing treatment is carried out on the strip steel by the annealing furnace after nodulation is removed, the surface quality of the strip steel is observed, no pit is found, and the qualified rate of the surface quality detection of the strip steel is 100%. By adopting the method provided by the comparative example 1, the average pit depth size before treatment is 46 μm, the average pit length size is 390 μm, the annealing furnace after removing the nodules carries out annealing treatment on the strip steel, the surface quality of the strip steel is observed, the pit on the surface of the strip steel is still found, and the qualified rate of the surface quality detection of the strip steel is 88.9%.
The invention provides a method for eliminating furnace roller nodulation, which comprises the steps of determining the position of a furnace roller with the nodulation in a continuous annealing furnace; adjusting the temperature of the furnace roller with the determined nodules to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller; and (3) placing the grinding roller strip steel on the low-temperature furnace roller of the continuous annealing furnace, rotating the low-temperature furnace roller for 0.3-0.5 circle at the linear speed of more than 30mpm, and stopping rotating to remove the roller surface nodules of the low-temperature furnace roller. The furnace roller and the accretion generate different shrinkage amounts by controlling the higher cooling rate of the furnace roller, so that the bonding force of the accretion and the furnace roller is reduced; reducing gas is introduced at the temperature of not more than 600 ℃ to reduce iron oxide in the nodules into iron, so that the nodules are looser, and the binding force between the nodules and the furnace roller is weakened; on the basis of reducing the binding force between the accretion and the furnace roller by the physical method and the chemical method, the furnace roller is rotated in a inching mode, so that the friction force is generated between the dynamic furnace roller and the static grinding roller strip steel, thereby removing the stubborn accretions on the furnace roller, and the surface qualification rate of the strip steel produced by adopting the furnace roller is 100 percent. The method can treat the nodules on the surface of the furnace roller under the condition that the strip steel in the furnace stops heating and is discharged, avoids the defects of batch punch marks and the like caused by foreign matters falling on the surface of the roller, and solves the problems of extremely high treatment difficulty and the like caused by the sealing, high-temperature and high-speed operation of annealing furnace equipment; the operation is facilitated, and the popularization value and the application prospect are high; in addition, the method is simple to operate and convenient and quick to process.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A method of eliminating accretions on a furnace roller, said method comprising:
determining the position of the furnace roller with the nodules in the continuous annealing furnace;
adjusting the temperature of the furnace roller with the nodules at the determined position to be less than or equal to 600 ℃ at a cooling rate of more than 10 ℃/min, and simultaneously introducing reducing gas to reduce the bonding force between the nodules and the furnace roller so as to obtain a low-temperature furnace roller;
and (3) placing the grinding roller strip steel on the low-temperature furnace roller of the continuous annealing furnace, rotating the low-temperature furnace roller for 0.3-0.5 circle at the linear speed of more than 30mpm, and stopping rotating to remove the roller surface nodules of the low-temperature furnace roller.
2. The method for eliminating the furnace roller nodulation according to the claim 1, characterized in that the rotating linear speed of the low temperature furnace roller is 25-35 mpm.
3. The method as claimed in claim 1, wherein the temperature reduction rate is 10-15 ℃/min, and the temperature of the low temperature furnace roller is 500-600 ℃.
4. The method of claim 1, wherein the volume fraction of hydrogen in the reducing gas is 8-12%.
5. The method for eliminating accretions on a furnace roller according to claim 1, wherein the temperature of said accreted furnace roller is adjusted by: the nodular furnace rolls were run at a rate of 100-150mpm using cold rolled steel strip at a temperature of 25-40 ℃.
6. The method for eliminating punch marks on steel strip according to claim 1, wherein the position of the furnace roller with the nodules is determined in the continuous annealing furnace, comprising,
determining a first process section of the cold-rolled strip steel with a pit in a continuous annealing furnace;
performing deviation rectification treatment on the cold-rolled strip steel running on the process section before the determined first process section;
and if the position of the pit in the width direction of the cold-rolled strip steel is changed through deviation rectifying treatment, determining the position of a furnace roller with a nodule in the previous process section of the first process section.
7. The method for eliminating the accretions on the furnace roller as recited in claim 6, wherein the deviation rectifying amount is 20-50mm during the deviation rectifying process.
8. The method as claimed in claim 6, wherein the running speed of the cold-rolled steel strip is 150-180mpm during the deviation rectifying process.
9. The method as claimed in claim 6, wherein the temperature of the cold-rolled strip steel during the deviation-correcting process is 580-620 ℃.
10. The method for eliminating furnace roller accretion as claimed in claim 1, wherein the width of said grinding roller strip is 900-.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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CN115323126A (en) * 2022-07-27 2022-11-11 攀钢集团西昌钢钒有限公司 Method for quickly reducing accretions on furnace roller of continuous annealing furnace and prolonging service cycle of furnace roller
CN115323126B (en) * 2022-07-27 2023-05-23 攀钢集团西昌钢钒有限公司 Method for rapidly reducing furnace roller nodulation of continuous annealing furnace and prolonging service cycle of furnace roller nodulation
CN115478157A (en) * 2022-09-28 2022-12-16 首钢智新迁安电磁材料有限公司 Method for removing furnace roller accretions
CN115478157B (en) * 2022-09-28 2024-01-02 首钢智新迁安电磁材料有限公司 Method for removing furnace roller nodulation

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