CN111411214A - Method for preventing buckling and deflection in strip steel continuous annealing furnace with thickness of not more than 0.5mm - Google Patents
Method for preventing buckling and deflection in strip steel continuous annealing furnace with thickness of not more than 0.5mm Download PDFInfo
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- 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
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- C21D1/26—Methods of annealing
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- 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
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- 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
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Abstract
The method for preventing buckling and deviation in the continuous annealing furnace of the strip steel with the thickness of not more than 0.5mm provided by the invention has the advantages that the tension of the heating section and the soaking section is controlled to be 6.48-8.64N/mm2(ii) a The temperature is controlled at 770-830 ℃; the tension of the strip steel in the cold zone of the continuous annealing furnace is controlled to be 6.21-8.464N/mm2(ii) a The plate temperature of the final cooling section is controlled at 170-180 ℃. Compared with the prior art, the method prevents buckling and deviation of thin-specification strip steel with the thickness of not more than 0.5mm in the continuous annealing process by increasing the tension of the hot area in the furnace, reducing the tension of the cold area, reducing the temperature of the hot area plate, improving the temperature of the final cooling section plate and the like, improves the one-time hit rate of products and ensures smooth production.
Description
Technical Field
The invention belongs to the technical field of continuous annealing, relates to a method for preventing cold-rolled strip steel from buckling and deviating in a continuous annealing furnace, and particularly relates to a method for preventing cold-rolled strip steel from buckling and deviating in a strip steel furnace with the thickness of not more than 0.5 mm.
Background
The continuous annealing furnace is generally divided into 8 different zones, namely, a preheating zone (JPF), a heating zone (RTF), a soaking zone (SF), a slow cooling zone (SCS), a rapid cooling zone (RCS), a 1# aging zone (1# OA), a 2# aging zone (2# OA), and a final cooling zone (FCS), and the strip tension of each zone is adjusted by a tension gauge roller disposed between the zones. In the high-speed continuous annealing process of the cold-rolled strip steel, the buckling and deviation phenomena of the strip steel are easy to occur under the influence of factors such as strip steel shape, tension in a furnace, transition of front and back varieties and specifications, temperature and the like.
For thin strip steel with the thickness of not more than 0.5mm, because the running speed of the strip steel is high in the continuous annealing process, particularly when the strip shape is poor, the buckling and deviation probability of the strip steel is greatly increased, the production rhythm is seriously influenced, the running speed of the strip steel is greatly limited, even production accidents such as edge scraping, strip breaking and the like of the strip steel in a furnace can be caused, and the furnace shutdown times are increased. According to statistics, the average speed in a thin-specification strip steel furnace with the thickness not greater than 0.5mm in 2014 is 240m/min, the strip steel is frequently forced to run at a reduced speed due to frequent buckling and deviation, under the condition, production accidents such as edge scraping, strip breakage and the like still occur sometimes, the furnace is shut down for 1-2 times per month averagely, a large amount of non-planned products and waste products are generated, and the production sequence and contract delivery are seriously influenced. For the thin cold-rolled strip steel with the thickness of not more than 0.5mm, more time, manpower and material resources are needed for recovering the production after the furnace is shut down, and the production cost is also greatly increased.
Buckling and deviation of thin (thickness not more than 0.5mm) cold-rolled strip steel in a continuous annealing furnace are difficult problems, and no report exists at present on a technical scheme of a relevant method for preventing buckling and deviation of thin strip steel with thickness not more than 0.5mm in a continuous annealing furnace.
Disclosure of Invention
The invention aims to provide a method for preventing buckling and deviation in a strip steel continuous annealing furnace with the thickness of not more than 0.5mm, and according to different positions and reasons for generating the deviation, different methods are adopted to prevent buckling and deviation in the thin strip steel continuous annealing furnace. The buckling and deviation phenomena of thin strip steel with the thickness not more than 0.5mm in the continuous annealing process are reduced by adjusting the temperature of different furnace sections, controlling the temperature change range, increasing the tension of a hot zone in the furnace, reducing the tension of a cold zone, reducing the temperature of a hot zone plate, improving the temperature of a final cooling zone plate and the like, the time yield of a lifter is increased, the one-time hit rate of the product is improved, and the smooth production is ensured.
The specific technical scheme of the invention is as follows:
the method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm specifically comprises the following steps:
the tension of the heating section and the soaking section is controlled to be 6.48-8.64N/mm2(ii) a The temperature is controlled at 770-830 ℃; the tension of the strip steel in the cold zone of the continuous annealing furnace is controlled to be 6.21-8.464N/mm2(ii) a The plate temperature of the final cooling section is controlled at 170-180 ℃.
Further, the cold zone comprises a No. 1 aging section, a No. 2 aging section and a final cooling section.
Preferably, the tension of the 1# aging section is controlled to be 6.21-7.55N/mm2The tension of the 2# aging section is controlled to be 6.21-7.55N/mm2The tension of the final cooling section is controlled to be 6.21-8.464N/mm2。
Further, the tension of the preheating section is controlled between 6.6 and 8.1N/mm2The tension of the heating section is controlled to be 6.48-8.64N/mm2The tension of the soaking section is controlled to be 6.48-8.64N/mm2The tension of the slow cooling section is controlled to be 6.3-8.1N/mm2The tension of the fast cooling section is controlled between 6.615 and 8.63N/mm2The tension of the 1# aging section is controlled to be 6.21-7.55N/mm2The tension of the 2# aging section is controlled to be 6.21-7.55N/mm2The tension of the final cooling section is controlled to be 6.21-8.464N/mm2The strip tension in each zone is adjusted by tension gauge rollers disposed between the zones.
Further, for the deep drawing strip steel with the thickness of 0.4-0.5mm, the temperature of the heating section is controlled to be 820 +/-10 ℃, the temperature of the soaking section is controlled to be 820 +/-5 ℃, and the temperature of the final cooling section is controlled to be 170-180 ℃.
For the deep drawing strip steel with the thickness less than 0.4mm, the temperature of the heating section is controlled at 815 +/-10 ℃, the temperature of the soaking section is controlled at 815 +/-5 ℃, and the temperature of the final cooling section is controlled at 170-180 ℃.
For general stamping strip steel with the thickness less than or equal to 0.5mm, the temperature of the heating section is controlled to be 780 +/-10 ℃, the temperature of the soaking section is controlled to be 780 +/-5 ℃, and the temperature of the final cooling section is controlled to be 170-180 ℃.
The invention adopts manual tension mode control;
further, the acceleration rate of the annealing speed of the strip steel of the continuous annealing furnace was set to 0.01m/s2So as to reduce the fluctuation of the tension in the furnace when the strip steel in the furnace is normally accelerated and decelerated, and reduce the buckling and deviation risks of the strip steel.
Furthermore, before the strip steel with the thickness of not more than 0.5mm enters the continuous annealing furnace, the thickness difference of front and rear transition products is controlled according to the thickness of not more than 0.05mm, so that the tension fluctuation in the furnace during the transition of the strip steel is reduced.
Before strip steel with the thickness not more than 0.5mm enters a continuous annealing furnace, the width transition requirement is as follows: when the front part is narrow and the rear part is wide and the width difference is more than or equal to 100mm, a crescent transition area is punched on the wide edge of the welding joint by using a crescent shear, so that stress concentration in the welding joint accessory area is avoided, and the buckling risk is increased;
further, if the process temperature is required to be transited before the strip steel with the thickness of not more than 0.5mm enters the continuous annealing furnace, transition materials are arranged between different steel types, the general principle of the two materials for temperature transition is that the process with high requirement is preferentially executed, and the strong adaptability of the deformation performance of the general strip steel DC01 for stamping to the temperature change is generally widely used for the transition materials, so that the temperature of each area in the furnace can be smoothly transited to the process requirement of the invention. If the process temperature of the incoming materials a and b is high (a: 800 ℃, b: 820 ℃) and the specifications of steel grades are different, the transition material is arranged between a and b, the temperature of the transition material is increased after a is discharged from the furnace, and the temperature of b is allowed to meet 820 ℃ before b is charged into the furnace.
Furthermore, the thermal buckling of the strip steel in the heating section and the soaking section is prevented, the annealing temperature is properly reduced and controlled at 770-830 ℃, so that the target strip steel with the thickness of not more than 0.5mm is transited in advance and stabilized at the required annealing temperature before entering the furnace.
Furthermore, when the incoming material plate is seriously poor, the deviation in the furnace of the hot area A is easy to generate, and the deviation in the furnace of the thin-specification strip steel is prevented by adopting a method of switching the heating modes to increase the temperature of the area A of the hot area and reduce the fluctuation range of the strip steel temperature of the heating section; the method specifically comprises the following steps: if the incoming material plate is too poor and the deviation is serious in the hot area A, the heating mode is switched from the normal mode to the proportional mode, the temperature of the area A of the hot area A is quickly raised to about 650 ℃ from about 450 ℃, and then the normal heating mode is recovered, so that the strip steel is quickly softened, the contact surface between the strip steel and a furnace roller is increased, and the deviation and the buckling are not easy to generate.
Further, the fan control of the final cooling section is as follows: through observation, when the load of the fan is more than or equal to 35%, the probability of the cold ladle of the strip steel in the final cooling section is increased, and the plate temperature difference between the 2# aging section and the final cooling section is properly reduced, so that the risk of the cold ladle generated by the strip steel in the final cooling section is reduced. Therefore, the temperature of the outlet plate of the final cooling section is controlled at 180 ℃ of 170 ℃ and the load of the 1# -6# variable frequency fan is generally controlled at 15-25%. If the load is lower than 15%, a fan is turned off to ensure that the load of the variable frequency fan is within the required control range, and simultaneously, the operation atmosphere of the strip steel in the furnace is kept stable, so that the influence of circulating injection cooling on the surface of the strip steel plate is further reduced.
The name of the continuous annealing production line provided by the invention specifically refers to:
heating mode: the method refers to a strip steel heating control mode in a hot zone of a continuous annealing furnace, and two modes, namely a proportional mode and a normal mode, are commonly used.
Proportional mode: the temperature set points of the radiant tubes of the heating section and the soaking section are 970 ℃, the radiant tubes in the areas are uniformly heated, the temperature of the area A of the hot area is about 650 ℃, and the temperature of the strip steel is uniformly increased after the strip steel enters the furnace. The mode has the advantages of high heating capacity, high output power of the radiant tube and strong adaptability, and is mainly used for strip steel with the thickness of more than or equal to 0.8 mm.
And (3) a normal mode: the temperature set points of the radiant tubes of the heating section and the soaking section are 970 ℃, wherein the temperature set output power of the radiant tubes of the hot area A is low, the temperature set point is low, and the temperature of the area A of the hot area is about 450 ℃, so that buckling caused by too fast temperature rise of thin strip steel after entering a furnace is prevented, and the temperature of the strip steel at the middle rear part of the heating section of the strip steel is quickly raised. The mode has moderate heating capacity and is mainly used for thin strip steel with the thickness less than 0.8 mm.
Hot zone a: the front end of the heating section is the furnace area behind the preheating section before the 4# deviation correcting roller in the heating section.
Hot zone B: the zone after the 4# deviation correcting roller in the heating section and the soaking section are referred to.
And (3) a cold area C: the method refers to a 1# aging section, a 2# aging section and a final cooling section.
And a secondary system tension set value control mode: according to different specifications and varieties of strip steel, setting the tension value of a conventional secondary system in each section in the furnace, and transferring the tension value to a primary system to be executed under the control of a computer.
Manual tension control mode: according to different specifications and varieties of strip steel, the tension value of the conventional secondary system is manually modified in each area in the furnace, and the modified tension value of the secondary system is handed to the primary system to be executed under the control of a computer.
The unit tension control values of the respective zones of the continuous annealing furnace according to the present invention are shown in Table 1 below.
TABLE 1 control value of unit tension in each zone of continuous annealing furnace
Controlling the process temperature of a heating section, a soaking section and a final cooling section in the furnace: on the premise of ensuring that the performance of the strip steel is qualified, the annealing temperatures of the heating section and the soaking section are properly reduced, and meanwhile, the temperature of an outlet plate of the final cooling section is increased to 170-180 ℃, so that the temperature drop of the strip steel in the transition from the 2# aging section to the final cooling section is reduced, the influence of the circular blowing cooling of a fan of the final cooling section on the surface cooling of the strip steel is relieved, the generation of a cold ladle is avoided, and the temperature improvement condition of the heating process in the strip steel furnace with the thickness not more than 0.5mm is shown in table 2.
TABLE 2 improvement of the temperature in the furnace heating of a strip of steel having a thickness of not more than 0.5mm (taking DC04 strip steel for deep drawing as an example)
On the premise of preventing buckling and deviation in a strip steel furnace with the thickness of not more than 0.5mm, the invention increases the tension of a hot zone A and a hot zone B, reduces the tension of a cold zone C, and properly adjusts the process temperatures of a heating section, a soaking section and a final cooling section by properly changing the temperature of the hot zone A, breaks through the method of adopting the traditional two-stage tension control and using the conventional process temperature, effectively prevents the buckling and deviation of the strip steel in the continuous annealing process, and thus ensures the stable and high-speed production of the strip steel.
The invention controls the tension and the temperature of the hot area A and the hot area B of the continuous annealing furnace so as to prevent hot ladle and deflection of the strip steel in the high-temperature area when the strip steel enters the furnace, and controls the tension and the temperature of the cold area C so as to prevent the strip steel from cold ladle in the final cold section.
The invention has the beneficial effects that: compared with the prior art, the tension setting method has the advantages that the tension setting values of different areas are improved, the heating process temperature is optimized, the tension setting method mainly based on the secondary setting value is changed, and the operation method mainly based on the manual setting of the tension is innovated. The manual tension control mode is selected, the tension set values of the hot area A and the hot area B are increased to prevent the strip steel from deviating after entering the furnace, the tension set value of the cold area C is reduced to avoid buckling of the strip steel, the operation is simple, the adjustment is convenient, and the buckling and deviating phenomena of the strip steel with the thickness not more than 0.5mm in the furnace are greatly reduced, so that the machine-hour yield is effectively improved, the fault time and the furnace shutdown accidents are reduced, the product quality is improved, and the average speed in the strip steel furnace is improved to 280m/min from the original speed less than 240 m/min. Compared with the production condition of the two-level set value mode in the prior art, the production method of the invention comprises the following steps: the average number of furnace shut-down months caused by continuous annealing unit equipment and production reasons is 3.4 times/month, the number of furnace start accidents is 0 time/month, and the number of furnace shut-down months is respectively reduced by 1.43 times/month and 1 time/month in the same ratio with the prior art. By adopting the method, the operation fault time is reduced by 67.54 percent in proportion to the prior art method, and the total fault time is reduced by 38.96 percent in proportion. Meanwhile, the gas consumption is reduced, the stability of high-speed production in a strip steel furnace with the thickness of not more than 0.5mm is improved, the contract exchange rate is ensured, and the enterprise credit and economic benefits are improved.
Drawings
FIG. 1 is an internal structure of a continuous annealing furnace according to the present invention; wherein, 1-preheating section, 2-heating section, 3-soaking section, 4-slow cooling section, 5-fast cooling section, 6-1# aging section, 7-2# aging section and 8-final cooling section; 9-4# deviation rectifying roller; 10-5# deviation rectifying roller; 11-a tensiometer roller; hot zone a: the front end of the heating section is a furnace area in front of a 4# deviation rectifying roller in the heating section; hot zone B: the device refers to a region and a soaking section behind a 4# deviation correcting roller in a heating section; and (3) a cold area C: the method comprises the steps of 1# aging section, 2# aging section and final cooling section; the 4# deviation rectifying roller is arranged in the heating section; the No. 5 deviation correcting roller is arranged in the soaking section; the strip tension is adjusted by tensiometer rollers arranged between the zones.
Detailed Description
The method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm comprises the following steps:
1. planning and arranging: before the target thin-specification strip steel enters the furnace, the thickness difference of a transition product is controlled according to the thickness of less than or equal to 0.05mm, so that the tension fluctuation in the furnace during the transition of the strip steel is reduced. If the width transition is narrow in the front and wide in the back and the width difference is larger than or equal to 100mm, a crescent transition area is punched on the wide edge of the welding joint by using a crescent shear, stress concentration of a welding joint accessory area is avoided, buckling risk is increased, and in plan, if process temperature transition is needed among various steel types, a proper amount of transition materials are arranged among different steel types, the general principle of temperature transition is high-requirement process preferential execution, and the general strip steel DC01 deformation performance for stamping is strong in adaptability to temperature change and is generally widely used for the transition materials, so that the temperature of each area in the furnace can be smoothly transited to the process requirement of the invention.
2. Tension control: the control of a second-level tension mode is changed into the control of a manual tension mode, and the acceleration rate of the strip steel annealing speed of the continuous annealing furnace is set to be 0.01m/s2So as to reduce the fluctuation of the tension in the furnace when the strip steel in the furnace is normally accelerated and decelerated and reduce the buckling risk of the strip steel.
3. A heating process: preventing the strip steel in the heating section and the soaking section from generating thermal buckling, properly reducing the annealing temperature, controlling the temperature at 770-830 ℃, and leading the target strip steel to be transited in advance and stabilized at the required annealing temperature before entering the furnace; if the incoming material plate shape is too poor and the deviation is serious in the hot area A, the heating mode is switched from the normal mode to the proportional mode, the temperature of the area A of the hot area A is quickly raised to about 650 ℃ from 450 ℃, so that the strip steel is quickly softened, the contact surface between the strip steel and a furnace roller is increased, the deviation and the buckling are not easy to generate, and then the normal heating mode is recovered.
4. And (3) final cooling section fan control: through observation, when the load of the fan is more than or equal to 35%, the probability of the cold ladle of the strip steel in the final cooling section is increased, and the plate temperature difference between the 2# aging section and the final cooling section is properly reduced, so that the risk of the cold ladle generated by the strip steel in the final cooling section is reduced. Therefore, the temperature of the outlet plate of the final cooling section is controlled at 180 ℃ of 170 and the load of the 1# -6# variable frequency fan is generally controlled at about 15-25%. If the load is lower than 15%, a fan is turned off to ensure that the load of the variable frequency fan is within the required control range, and simultaneously, the operation atmosphere of the strip steel in the furnace is kept stable, so that the influence of circulating injection cooling on the surface of the strip steel plate is further reduced.
According to the method, the parameters of the specific embodiment for treating different steels are as follows:
example 1
The method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm comprises the following steps:
the steel grade XGMB (strip steel for deep drawing) is a target steel grade XGMB (strip steel for deep drawing), the product specification thickness is × mm, the width is 0.5 × 1250mm, 2 rolls of transition materials are arranged according to production planning, the steel grade is DC01, the product specification thickness is × mm, the width is 0.6 × 1000mm, as the transition is narrow in the front and wide in the back, the width difference is more than or equal to 100mm, a transition area is punched at the half part of the back of the crescent at the welding line by using a crescent shear, and the risk of buckling increased by stress concentration in the transition area is.
And (3) heating temperature control: the plate temperature of the heating section and the soaking section is gradually increased from 780 ℃ to 820 ℃ required by the target strip steel and kept in a stable state when 2 coils of forward transition material DC01 are produced.
Tension control mode: after the target strip steel enters the furnace, the second-level tension mode control is changed into manual tension mode control, the tension of the heating section and the soaking section is gradually modified to be + 14.85% of the second-level value before the head of the target strip steel is about to pass through the rollers of the tension meter of the heating section and the soaking section, and the tension of the 1# aging section, the 2# aging section and the final cooling section is gradually modified to be-10% of the second-level value before the head of the target strip steel is about to pass through the rollers of the tension meter of the 1# aging section, the 2# aging section and the final cooling section. The tension modification amplitude is 0.10KN, and the actual tension is modified after reaching the set value of the manual tension. Tension distribution of each area in the furnace: as shown in table 3. The average speed of the strip in the furnace and the buckling and deviation of the strip in the furnace are shown in the table 4.
The control mode of the final cooling section fan is as follows: the temperature of the final cooling section is stabilized at 170-180 ℃ before the target strip steel enters the final cooling section.
TABLE 3 tension distribution in each zone of the furnace
TABLE 4 comparison of average speed of strip in furnace and buckling and deflection of strip in furnace in example 1
Note: the conventional tension refers to tension control at a two-level tension mode setting.
Example 2
The method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm comprises the following steps:
the target steel type DC03 (strip steel for deep drawing) has a product specification of 0.5 × 1000mm, 3 rolls of transition materials are arranged forward according to production planning, the steel type is DC01, and the product specification is 0.45 × 1100 mm.
And (3) heating temperature control: the plate temperature of the heating section and the soaking section is gradually increased from 780 ℃ to 810 ℃ required by the target strip steel and kept in a stable state when 3 coils of forward transition material DC01 are produced.
Tension control mode: after the target strip steel enters the furnace, the second-level tension mode control is changed into manual tension mode control, the tension of the heating section and the soaking section is gradually modified to be + 19.06% of the second-level value before the head of the target strip steel is about to pass through the rollers of the tension meters of the heating section and the soaking section, and the tension of the 1# aging section, the 2# aging section and the final cooling section is gradually modified to be-10% of the second-level value before the head of the target strip steel is about to pass through the rollers of the tension meters of the 1# aging section, the 2# aging section and the final cooling section. The tension modification amplitude is 0.10KN, and the actual tension is modified after reaching the set value of the manual tension. Tension distribution of each area in the furnace: as shown in table 5. The average speed of the strip in the furnace and the buckling and deviation of the strip in the furnace are shown in the table 6.
The control mode of the final cooling section fan is as follows: the temperature of the plate at the final cooling section is stabilized at 170-180 ℃ before the target strip steel enters the final cooling section.
TABLE 5 tension distribution in each zone of the furnace
Note: the conventional tension refers to tension control at a two-level tension mode setting.
TABLE 6 comparison of average speed of strip steel in furnace and buckling and deviation of strip steel in furnace in example 2
Example 3
The method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm comprises the following steps:
the target steel type XGMB (strip steel for deep drawing) is 0.4 × 1000mm in product specification, 2 rolls of transition materials are arranged forward according to production planning, the steel type is DC01, and the product specification is 0.4 × 1000 mm.
And (3) heating temperature control: the plate temperature of the heating section and the soaking section is gradually increased from 780 ℃ to 815 ℃ required by target strip steel and kept in a stable state when 2-coil forward transition material DC01 is produced.
Tension control mode: after the target strip steel enters the furnace, the second-level tension mode control is changed into manual tension mode control, the tension of the heating section and the soaking section is gradually modified to be + 15% of the second-level value before the head of the target strip steel is about to pass through the tension meter rollers of the heating section and the soaking section, and the tension of the 1# aging section, the 2# aging section and the final cooling section is gradually modified to be-10% of the second-level value before the head of the target strip steel is about to pass through the tension meter rollers of the 1# aging section, the 2# aging section and the final cooling section. The tension modification amplitude is 0.10KN, and the actual tension is modified after reaching the set value of the manual tension.
The control mode of the final cooling section fan is as follows: the temperature of the plate at the final cooling section is stabilized at 170-180 ℃ before the target strip steel enters the final cooling section.
Tension distribution of each area in the furnace: as shown in table 7. The average speed of the strip in the furnace and the buckling and deflection of the strip in the furnace are shown in Table 8.
TABLE 7 tension distribution in each zone of the furnace
Note: the conventional tension refers to tension control at a two-level tension mode setting.
TABLE 8 comparison of average speed of strip in furnace and buckling and deflection of strip in furnace in example 3
The method can prevent buckling and deflection in the strip steel furnace with the thickness of not more than 0.5 mm.
Claims (8)
1. The method for preventing buckling and deflection in the strip steel continuous annealing furnace with the thickness of not more than 0.5mm is characterized by comprising the following steps of:
the tension of the heating section and the soaking section is controlled to be 6.48-8.64N/mm2(ii) a The temperature is controlled at 770-830 ℃; the tension of the strip steel in the cold zone of the continuous annealing furnace is controlled to be 6.21-8.464N/mm2(ii) a The plate temperature of the final cooling section is controlled at 170-180 ℃.
2. The method of claim 1, wherein the tension of the preheating zone is controlled to 6.6-8.1N/mm2The tension of the heating section is controlled to be 6.48-8.64N/mm2The tension of the soaking section is controlled to be 6.48-8.64N/mm2The tension of the slow cooling section is controlled to be 6.3-8.1N/mm2The tension of the fast cooling section is controlled between 6.615 and 8.63N/mm2The tension of the 1# aging section is controlled to be 6.21-7.55N/mm2The tension of the 2# aging section is controlled to be 6.21-7.55N/mm2The tension of the final cooling section is controlled to be 6.21-8.464N/mm2。
3. The method as claimed in claim 1 or 2, wherein the heating zone temperature is controlled at 820 ± 10 ℃, the soaking zone temperature is controlled at 820 ± 5 ℃ and the final cooling zone temperature is controlled at 170-.
4. The method as claimed in claim 1 or 2, characterized in that for deep-drawing steel strips with a thickness of < 0.4mm, the temperature in the heating section is controlled at 815 ± 10 ℃, the temperature in the soaking section is controlled at 815 ± 5 ℃ and the temperature in the final cooling section is controlled at 170-.
5. The method as claimed in claim 1 or 2, wherein for a general strip steel for stamping having a thickness of 0.5mm or less, the temperature of the heating section is controlled to 780 ± 10 ℃, the temperature of the soaking section is controlled to 780 ± 5 ℃, and the temperature of the final cooling section is controlled to 170-.
6. The method according to claim 1 or 2, characterized in that the difference in thickness of the transition product is controlled to be 0.05mm or less before the strip having a thickness of not more than 0.5mm is fed into the continuous annealing furnace.
7. The method according to claim 1 or 2, characterized in that the width transition requirement before the strip with the thickness of not more than 0.5mm enters the continuous annealing furnace is as follows: when the front part is narrow and the rear part is wide and the width difference is more than or equal to 100mm, a crescent transition area is punched on the wide edge of the welding joint by using a crescent shear.
8. A method according to claim 1 or 2, characterized in that if the incoming material plate is too bad and the hot zone a is off tracking, the heating mode is switched from normal mode to proportional mode, the temperature of the zone a of the hot zone is raised from 450 ℃ to 650 ℃ rapidly, and then the normal heating mode is resumed.
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