Continuous annealing process method for cooperatively regulating and controlling shape of ultrathin and wide precision foil

Abstract

The invention provides a continuous annealing process method for cooperatively regulating and controlling the shape of an ultrathin and wide precise foil, and relates to the technical field of advanced material processing frontier. According to the continuous annealing process method for synergistically regulating and controlling the shape of the ultrathin and wide precise foil, micron-sized precise foils with different marks, the specification of 0.02-0.2 mm and the width of more than 600mm are selected for continuous annealing, and the preparation process comprises the following steps: putting a cold-rolled and cleaned ultrathin and wide foil coiled material into a continuous annealing furnace for annealing treatment, and the method can be suitable for regulating and controlling the structure properties and the plate shapes of various ultrathin precise foils. The method can effectively control the abnormal growth of crystal grains, realizes the fine grain structure of the foil, improves the surface quality and the mechanical property of the ultrathin precise foil, fills the technical defects of the plate shape consistency and the structure property of the ultrathin and wide precise foil after annealing, and has positive significance in promoting the development of the key technical industry in China.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of advanced material processing, and in particular to a continuous annealing process method for shape and property synergistic control of ultra-thin and wide precision foil, and especially to a process control technology for realizing sheet shape optimization and microstructure homogenization by synergistic control of the first to eighth isothermal zone and two-section cooling zone and heat treatment method thereof, which is suitable for continuous annealing of metal foil with a thickness of 0.02-0.2 mm and a width of more than 600 mm (including 300 series stainless steel foil, TA1 titanium foil, etc.). BACKGROUND

[0002] In recent years, the rapid development of emerging industries represented by new energy, new materials and intelligent manufacturing has put forward higher requirements for materials, and the development of new materials has never been more difficult; as an important member of the field of advanced new materials, ultra-thin and wide precision foil has higher technical requirements on mechanical properties and sheet shape accuracy, especially 0.02-0.2 mm, 600 mm wide or more ultra-thin and wide precision foil has been widely used in 3C electronics, aerospace, new energy and other fields, and the dimensional accuracy, microstructure and excellent mechanical properties of precision foil are increasingly important.

[0003] In the cold rolling process, in order to eliminate residual stress, improve microstructure and performance, annealing heat treatment is usually required, and existing continuous annealing furnaces generally only include 4-6 temperature zones, which cannot meet the process requirements of preheating, heating, holding and precise cooling, resulting in uneven grain size and poor tempering effect. In order to improve production efficiency and product quality, a multi-zone annealing furnace with finer temperature distribution and more precise process parameter control is needed.

[0004] For example, Chinese invention patent CN107312924B discloses a stainless steel strip continuous annealing and pickling method, which adopts isothermal heating mode + pickling to remove oxide scale as the core process. However, for foil materials with higher grain refinement requirements (such as 316L, 304 austenitic stainless steel, TA1 pure titanium, etc.), the temperature of this type of annealing is insufficient, the maximum temperature does not exceed 960℃, the grains cannot be fully refined, and even abnormal growth occurs; there is no rapid cooling means, resulting in continuous grain boundary migration and poor microstructure uniformity; and the annealing process parameters (temperature control precision, cooling device) are not specifically detailed other parameters. For ultra-thin, wide and 0.02-0.2 mm thick stainless steel foil, the grain size has a significant impact on performance, and traditional processes can easily cause grain growth, foil strength to decrease, surface oxide scale to increase, and poor uniformity of transverse grain size, resulting in long acid pickling time, large surface roughness, and restricting the improvement of product quality.

[0005] Chinese patent CN117966060A discloses a continuous gradient type cover annealing method for ultra-large width-thickness ratio micron-level titanium foil material, which is a segmented continuous gradient heat treatment for micron-level titanium foil coiled material with a thickness of 0.05 mm or less and a width of 600 mm or more after cold rolling and cleaning degreasing by feeding the material into a cover annealing furnace through a rewinding process.

[0006] Chinese patent CN114309116A discloses a preparation method for wide and ultra-thin titanium foil strip, which is aimed at annealed finished product rolling mother tape, and adopts multi-pass rolling, pre-straightening treatment, heat treatment and straightening treatment. Obviously, annealing heat treatment is needed, and rolling, pre-straightening and straightening are also needed to cooperate to prepare the product. The process is complex, the operation difficulty is large, and it is not suitable for industrial mass production. SUMMARY

[0007] There is little research on the continuous annealing process path of ultra-thin, wide and precise foil material at present. In order to solve the technical problems of uneven thermal stress, poor organization reconstruction efficiency and large plate shape fluctuation of traditional annealing furnace when processing ultra-thin, wide and precise foil material, and to meet the urgent needs of new energy and new material, 3C electronic frontier field and seawater desalination field, a kind of ultra-thin, wide and precise foil material shape and property synergistic control continuous annealing process method is proposed, which can realize the synergistic annealing treatment of isothermal stress release, organization reconstruction activation and shape stability control of ultra-thin, wide and precise foil material under high temperature platform. With the multi-section tension closed-loop control system, the organization grain refinement, oxidation scale inhibition and surface smoothness improvement are realized. The present application can be applied to the heat treatment of various ultra-thin, wide and precise foil materials such as austenitic stainless steel (such as 304, 316L) and titanium foil (such as TA1, TA2), and has high universality and practical value. The technical scheme is as follows:

[0008] An ultra-thin, wide and precise foil material shape and property synergistic control continuous annealing process method, the specific process of which is as follows:

[0009] S1, feeding of ultra-thin, wide and precise foil material: feeding the cold-rolled and cleaned ultra-thin, wide and precise foil material into a continuous annealing furnace, which is provided with 8 isothermal zones and 2 rapid cooling zones;

[0010] S2, heat treatment of 8 isothermal zones: heat treatment of the ultra-thin, wide and precise foil material of S1 in the 1st-8th temperature zones to make the grain organization grow and nucleate rapidly, and obtain the heat-treated ultra-thin, wide and precise foil material;

[0011] S3, 2-stage cooling treatment: the heat-treated ultra-thin, wide, precision foil material in S2 is sent to a quenching zone for 2-stage cooling treatment, so that the real-time dynamic locking of the grain size morphology is realized, and the cooled ultra-thin, wide, precision foil material is obtained;

[0012] S4, post-treatment: the cooled ultra-thin, wide, precision foil material in S3 is sent to an acid pickling or surface passivation section for treatment, so that the finished micron-level precision foil material with flat shape and excellent surface quality is obtained.

[0013] Optionally, the ultra-thin, wide, precision foil material in S1 is micron-level precision foil material with a thickness of 0.02-0.2 mm and a width of more than 600 mm, the unwinding tension is set to 50-160 KG, and the winding tension is set to 100-260 KG.

[0014] Optionally, the ultra-thin, wide, precision foil material in S1 includes 316L stainless steel foil or TA1 titanium foil, and a temperature control feedback system including a thermocouple, an infrared temperature detector and a foil transverse temperature equalization control device is arranged in each of the 8 isothermal zones.

[0015] Optionally, in S2, the temperature in each of the first to eighth temperature zones is 1000-1100℃, the tension in the furnace is 8-10 KG, and the length of each temperature zone is 1.375 m.

[0016] Optionally, in S2, the heating mode of each of the first to eighth temperature zones is upper / lower radiation pipe + convection circulating fan + thermocouple closed-loop control, the furnace pressure is 200-400 Pa, and differential regulation is performed on the heating power, convection air speed and radiation intensity of each zone in the isothermal zone section, so that dynamic thermal field compensation control of the strip during operation is realized.

[0017] Optionally, in S2, the temperature control accuracy of each of the first to eighth temperature zones is ±1-2℃, the TV value is 0.5-3.0, the speed of the ultra-wide precision foil material is 20-40 m / min, the dew point is -70--75, and the circulation amount is 180-190.

[0018] Optionally, in S2, the atmosphere of each of the first to eighth temperature zones is hydrogen protective gas, and the flow rate is 20-50 m 3 / h.

[0019] Optionally, the annealing furnace is provided with a multi-stage tension closed-loop control system, and the tension range is 50-150 KG, so that automatic adjustment of the running state is realized

[0020] Optionally, in S3, the quenching zone is a 2-stage cooling zone, the cooling rate is 35-100℃ / s, and the frequency is ≤50 Hz.

[0021] Technical principle of the application:

[0022] The present application relates to a super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process, based on the deep coupling of microstructure evolution mechanism and macroscopic shape and property control demand, adopting multi-section isothermal zone + rapid cooling zone synergistic heat treatment mode, realizing the dynamic organization regulation and shape and property stability control of micron level metal foil (thickness 0.02~0.2mm, width ≥600mm) in high temperature annealing process. The core technical principle of the method is as follows:

[0023] 1. Dynamic thermal field compensation control

[0024] Each isothermal zone adopts a composite heating system of "up and down radiation pipe + convection circulating fan + thermocouple closed loop", realizes the temperature accurate compensation of the strip in the running process through the differential adjustment of radiation intensity, wind speed and heating power, ensures the stability of horizontal and vertical thermal field. The precision thermal control system can control the temperature control accuracy in the range of ±1~2℃, effectively reduces the local abnormal organization caused by temperature fluctuation.

[0025] 2. Two-stage rapid cooling grain locking mechanism

[0026] After completing the isothermal organization reconstruction, through the two-stage rapid cooling zone with cooling rate of 35~100℃ / s, the "real-time locking" of grain growth state is realized, the further migration of grain boundary is inhibited, and the grain growth and coarsening are prevented, so that the fine grain structure and the flatness stability are maintained.

[0027] 3. Tension closed loop synergistic shape and property control system

[0028] The furnace body is provided with multi-section tension closed loop control device, realizes the real-time feedback control of the flatness and tension of the running strip through the front, middle and rear tension adjustment, effectively eliminates the shape and property defects such as warping and bulging caused by heat treatment, and ensures the flatness and subsequent processability of the super-thin strip.

[0029] The above technical scheme has at least the following beneficial effects compared with the prior art:

[0030] The above scheme, the present application proposes a super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process method, which can solve the technical problems of uneven thermal stress, poor organization reconstruction efficiency and large shape fluctuation of traditional annealing furnace in processing super-thin, wide foil, can effectively control the abnormal grain growth, realize the fine grain structure of foil, and improve the surface quality and mechanical properties of super-thin, precise foil, fill the technical short board of super-thin, wide, precise foil in shape consistency and organization performance after annealing, and has positive significance for promoting the development of key technology industry in China.

[0031] The application adopts a continuous annealing process technology to prepare an ultrathin wide-width foil with excellent plate shape precision, uniformity of structure and excellent mechanical properties, the annealing process has high temperature control precision and good stability, and can greatly increase the production efficiency.

[0032] The application sets eight isothermal zones (Zone 1~Zone 8) in the annealing section, all the temperature of the zones is set to the same target value (such as 950℃, 1000℃ or 1100℃), to form an isothermal platform, effectively reducing the heat stress concentration of the strip caused by the transition of the zones.

[0033] The application is different from the traditional multi-zone mode of preheating-heating-soaking, the structure activates the tissue reconstruction through temperature stability rather than gradient change; the structure can improve the uniformity of the tissue of the ultrathin material and the stability of the plate shape, and the eighth isothermal section is directly connected with the rapid cooling section, through two-stage rapid cooling, the grain state is locked immediately after the recrystallization of the tissue in the isothermal state is completed, to avoid the problem of secondary abnormal growth of the grains.

[0034] The application is not only suitable for austenitic stainless steel, but also suitable for duplex stainless steel and titanium and titanium alloy materials, according to the temperature sensitivity of the recrystallization and grain size of the foil, the isothermal dynamic annealing parameters and curve platform of different alloy systems are adjusted and adapted through the parameterization of the target temperature of the isothermal zone, the strip speed and the cooling rate.

[0035] In summary, compared with the traditional preparation method of ultrathin wide-width precision foil, the method of the application passes through eight isothermal zones and two rapid cooling zones in the annealing section to obtain a finished product of micron-level precision foil with flat plate shape and excellent surface quality; the preparation method does not need complex modification of the equipment, is suitable for industrial continuous production, expands the material adaptation range and matches the differential temperature control path, significantly reduces the production cost, is simple and easy to operate, green and environmentally friendly, low in cost, short in process, high in efficiency, and beneficial to industrial large-scale production and promotion. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 is a step schematic diagram of a super-thin, wide-width precision foil shape and property synergistic regulation continuous annealing process method according to embodiment 1 of the application;

[0038] Figure 2is a 0.048mm specification 316L stainless steel foil microstructure diagram of the super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process method of embodiment 1 of the present application.

[0039] Figure 3 is a 0.048mm specification 316L stainless steel foil grain size diagram of the super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process method of embodiment 1 of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the present application will be described below with reference to the drawings.

[0041] In the embodiments of the present application, the words such as "example", "for example" are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific way. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0042] In the embodiments of the present application, "image" and "picture" can be used interchangeably at times. It should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0043] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1. When the distinction is not emphasized, the meanings expressed are consistent.

[0044] In order to make the technical problems, technical solutions and advantages of the present application more clear, the following will be described in detail with reference to the drawings and specific embodiments.

[0045] A super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process method, the specific process of the super-thin, wide, precise foil shape and property synergistic regulation continuous annealing process method is as follows:

[0046] S1, feeding of the super-thin, wide, precise foil: feeding the super-thin, wide, precise foil after cold rolling and cleaning into a continuous annealing furnace, the continuous annealing furnace is provided with 8 isothermal zones and 2 sections of rapid cooling zone;

[0047] S2, heat treatment of the 8 isothermal zones: the super-thin, wide, precise foil of S1 is subjected to isothermal zone heat treatment in the 1st-8th temperature zone to make the grain structure realize rapid growth and nucleation process, and obtain a heat-treated super-thin, wide, precise foil;

[0048] S3, two-stage cooling treatment: the heat-treated ultra-thin, wide, precision foil material of S2 is sent to a quenching zone for two-stage cooling treatment, so as to realize real-time dynamic locking of the grain size form, and obtain a cooled ultra-thin, wide, precision foil material;

[0049] S4, post-treatment: the cooled ultra-thin, wide, precision foil material of S3 is sent to an acid pickling or surface passivation section for treatment, so as to obtain a finished micron-level precision foil material with flat plate shape and excellent surface quality.

[0050] In particular, the ultra-thin, wide, precision foil material in S1 is a micron-level precision foil material with a thickness of 0.02-0.2 mm and a width of more than 600 mm, the unwinding tension is set to 50-160 KG, and the winding tension is set to 100-260 KG.

[0051] In particular, the ultra-thin, wide, precision foil material in S1 includes 316L stainless steel foil or TA1 titanium foil, and a temperature control feedback system including a thermocouple, an infrared temperature detector, and a foil transverse temperature equalization control device is arranged in each of the eight isothermal zones.

[0052] In particular, in S2, the temperature in each of the first to eighth temperature zones is 1000-1100℃, the furnace tension is 8-10 KG, and the length of each temperature zone is 1.375 m.

[0053] In particular, in S2, the heating mode of each of the first to eighth temperature zones is upper / lower radiation pipe + convection circulating fan + thermocouple closed-loop control, the furnace pressure is 200-400 Pa, and differential regulation is performed on the heating power, convection air speed, and radiation intensity of each zone in the isothermal zone section, so as to realize dynamic thermal field compensation control of the strip during operation.

[0054] In particular, in S2, the temperature control accuracy of each of the first to eighth temperature zones is ±1-2℃, the TV value is 0.5-3.0, the speed of the ultra-wide, precision foil material is 20-40 m / min, the dew point is -70--75, and the circulation amount is 180-190.

[0055] In particular, in S2, the atmosphere of each of the first to eighth temperature zones is hydrogen protective gas, and the flow rate is 20-50 m 3 / h.

[0056] In particular, the annealing furnace is equipped with a multi-stage tension closed-loop control system, and the tension range is 50-150 KG, so as to realize automatic adjustment of the running state

[0057] In particular, in S3, the quenching zone is a two-stage cooling zone, the cooling rate is 35-100℃ / s, and the frequency is ≤50 Hz.

[0058] Example 1

[0059] The embodiment is a kind of ultra-thin, wide precision foil shape performance synergistic regulation continuous annealing process method, by selecting the specification of 0.048mm, 624mm wide ultra-thin, wide 316L stainless steel foil for continuous annealing, the specific process of the ultra-thin, wide precision foil shape performance synergistic regulation continuous annealing process method is combined Figure 1 As follows:

[0060] S1, the feeding of ultra-thin, wide precision foil: the cold-rolled, cleaned specification of 0.048mm, 624mm wide ultra-thin, wide 316L stainless steel foil is fed into the continuous annealing furnace, and the continuous annealing furnace is provided with 8 isothermal zones and 2 sections of quenching zone, 8 isothermal zones are provided with temperature control feedback system, including thermocouple, infrared thermometer and foil transverse temperature equalization control device; The unwinding tension is set to 50KG, and the winding tension is set to 100KG;

[0061] S2, heat treatment of 8 isothermal zones: the ultra-thin, wide precision foil of S1 is heat treated in the first 8 isothermal zones, the heating mode of the first 8 isothermal zones is upper / lower radiant tube+convection circulating fan+thermocouple closed loop control, the furnace pressure is 200-400Pa, the differential regulation of heating power, convection air speed and radiation intensity is carried out in the isothermal zone, the dynamic heat field compensation control of the strip in operation is realized; The grain structure realizes rapid growth and nucleation process, and the heat-treated ultra-thin, wide precision foil is obtained;

[0062] The specific process parameters are: the temperature of the first 8 isothermal zones is set to 1100℃, the furnace tension is set to 8KG, the furnace pressure is set to 400Pa, the TV value is set to 1.2, the ultra-wide precision foil speed is 25m / min, the dew point is-72, the circulation amount is 190, the atmosphere of each temperature zone is hydrogen protective gas, and the flow control is 20m 3 / h;

[0063] S3, 2 section cooling treatment: the heat-treated ultra-thin, wide precision foil of S2 is sent into the quenching zone for 2 section cooling treatment, the quenching zone is 2 section cooling zone, the cooling rate is 42℃ / s, the frequency is ≤50Hz, the real-time dynamic locking of grain size morphology is realized, and the cooled ultra-thin, wide precision foil is obtained;

[0064] S4, post-treatment: the cooled ultra-thin, wide precision foil of S3 is sent into the pickling or surface passivation section for treatment, and the finished micron precision foil with flat shape and excellent surface quality is obtained.

[0065] As Figure 2 and Figure 3 shown, Figure 2 and Figure 3The two figures exist coupling relationship, after the 316L stainless steel foil is continuously annealed by the process, the organization recrystallizes, the grain orientation and size form obviously change, the proportion of high-angle crystallization is above 94 %, and the grain size of 316L foil is 3-4 mu m at the annealing temperature above 1000 degrees, it is fine grain organization, enhances the mechanical property of foil, such as elongation increases. The hardness of the micron precision foil prepared in the embodiment is compared with the cooling ultra-thin, wide precision foil, and the grain size is 10 levels.

[0066] Embodiment 2

[0067] The embodiment is an ultra-thin, wide precision foil shape synergy control continuous annealing process method, which is selected by selecting the specification of 0.030mm, 630mm wide ultra-thin, wide TA1 titanium foil for continuous annealing, the specific process of the ultra-thin, wide precision foil shape synergy control continuous annealing process method is as follows:

[0068] S1, the feeding of the ultra-thin, wide precision foil: the specification of the cold-rolled, cleaned ultra-thin, wide TA1 titanium foil is 0.030mm, 630mm wide, and is fed into the continuous annealing furnace, the continuous annealing furnace is provided with 8 isothermal zones and 2 sections of quenching zone, 8 isothermal zones are provided with temperature control feedback system, including thermocouple, infrared thermometer and foil transverse temperature equalization control device; The unwinding tension is set to 60KG, and the winding tension is set to 110KG;

[0069] S2, heat treatment of 8 isothermal zones: the ultra-thin, wide precision foil of S1 is heat treated in the first to eighth temperature zone, the heating mode of the first to eighth temperature zone is upper / lower radiation pipe+convection circulating fan+thermocouple closed loop control, the furnace pressure is 200-400Pa, the differential control of heating power, convection air speed and radiation intensity in each zone is carried out in the isothermal zone, the dynamic heat field compensation control of the strip in operation is realized; The grain organization realizes rapid growth and nucleation process, and the heat treated ultra-thin, wide precision foil is obtained;

[0070] The specific process parameters are: the temperature of the first to eighth temperature zone is set to 570 DEG C, the furnace tension is set to 5KG, the furnace pressure is set to 300Pa, the TV value is set to 1.05, the ultra-wide precision foil speed is 35m / min, the dew point is-50, the circulation amount is 160, the atmosphere of each temperature zone is hydrogen protective gas, and the flow control is 30m 3 / h;

[0071] S3, 2 section cooling treatment: the heat treated ultra-thin, wide precision foil of S2 is sent into the quenching zone for 2 section cooling treatment, the quenching zone is 2 section cooling zone, the cooling rate is 60 DEG C / s, the frequency is less than or equal to 50Hz, the real-time dynamic locking of grain size form is realized, and the cooling ultra-thin, wide precision foil is obtained;

[0072] S4, post-processing: the cooled ultra-thin, wide, precision foil of S3 is sent to an acid pickling or surface passivation section for processing to obtain a finished micron-level precision foil with flat plate shape and excellent surface quality.

[0073] The finished micron-level precision foil prepared in this embodiment has a hardness of 10 degrees compared to the cooled ultra-thin, wide, precision foil.

[0074] Example 3

[0075] The ultra-thin, wide, precision foil shape and property synergistic control continuous annealing process method of this embodiment is used to continuously anneal an ultra-thin, wide, 316L stainless steel foil with a specification of 0.030 mm and a width of 610 mm. The specific process of the ultra-thin, wide, precision foil shape and property synergistic control continuous annealing process method is as follows:

[0076] S1, feeding of ultra-thin, wide, precision foil: the ultra-thin, wide, 316L stainless steel foil with a specification of 0.030 mm and a width of 610 mm after cold rolling and cleaning is fed into a continuous annealing furnace. The continuous annealing furnace is provided with 8 isothermal zones and 2 quenching zones. Each of the 8 isothermal zones is provided with a temperature control feedback system, including a thermocouple, an infrared thermometer, and a foil transverse temperature equalization control device. The unwinding tension is set to 80 KG, and the winding tension is set to 100 KG.

[0077] S2, heat treatment of 8 isothermal zones: the ultra-thin, wide, precision foil of S1 is subjected to heat treatment in the 1st-8th isothermal zones. The heating mode of the 1st-8th isothermal zones is upper / lower radiant tube + convection circulating fan + thermocouple closed-loop control, and the furnace pressure is 200-400 Pa. The heating power, convection air speed, and radiation intensity of each zone are differentially controlled to achieve dynamic heat field compensation control of the strip during operation. The grain structure is rapidly grown and nucleated to obtain a heat-treated ultra-thin, wide, precision foil.

[0078] The specific process parameters are as follows: the temperature of the 1st-8th isothermal zones is set to 1030℃, the furnace tension is set to 9.5 KG, the furnace pressure is set to 370 Pa, the TV value is set to 1.2, the ultra-wide precision foil speed is 31.6 m / min, the dew point is -72, the circulation amount is 200, and the atmosphere of each zone is hydrogen protective gas with a flow rate controlled at 20 m 3 / h;

[0079] S3, 2-stage cooling treatment: the heat-treated ultra-thin, wide, precision foil of S2 is sent to the quenching zone for 2-stage cooling treatment. The quenching zone is a 2-stage cooling zone with a cooling rate of 70℃ / s and a frequency of ≤50 Hz. The grain size and morphology are dynamically locked in real time to obtain a cooled ultra-thin, wide, precision foil.

[0080] S4, post-processing: the cooled ultra-thin, wide, precision foil of S3 is sent to an acid pickling or surface passivation section for processing to obtain a finished micron-level precision stainless steel foil with flat shape and excellent surface quality.

[0081] Example 4

[0082] The ultra-thin, wide, precision foil shape and property synergistic control continuous annealing process method of the present embodiment is implemented by selecting an ultra-thin, wide, 301 stainless steel foil with a specification of 0.085 mm and a width of 616 mm for continuous annealing. The specific process of the ultra-thin, wide, precision foil shape and property synergistic control continuous annealing process method is as follows:

[0083] S1, feeding of ultra-thin, wide, precision foil: the ultra-thin, wide, 301 stainless steel foil with a specification of 0.085 mm and a width of 616 mm after cold rolling and cleaning is fed into a continuous annealing furnace. The continuous annealing furnace is provided with 8 isothermal zones and 2 quenching zones. Each of the 8 isothermal zones is provided with a temperature control feedback system, including a thermocouple, an infrared thermometer, and a foil transverse temperature equalization control device. The unwinding tension is set to 150 KG, and the winding tension is set to 240 KG.

[0084] S2, heat treatment of 8 isothermal zones: the ultra-thin, wide, precision foil of S1 is subjected to heat treatment in the 1st-8th isothermal zones. The heating mode of the 1st-8th isothermal zones is upper / lower radiant tube + convection circulating fan + thermocouple closed-loop control, and the furnace pressure is 200-400 Pa. The heating power, convection air speed, and radiation intensity of each zone are differentially controlled in the isothermal zone to achieve dynamic heat field compensation control of the strip during operation. The grain structure is rapidly grown and nucleated to obtain a heat-treated ultra-thin, wide, precision foil.

[0085] The specific process parameters are as follows: the temperature of the 1st-8th isothermal zones is set to 1130℃, the furnace tension is set to 22 KG, the furnace pressure is set to 260 Pa, the TV value is set to 2.8, the speed of the ultra-wide precision foil is 32.9 m / min, the dew point is -72, the circulation amount is 180, and the atmosphere of each zone is hydrogen protective gas with a flow rate controlled at 30 m 3 / h;

[0086] S3, 2-stage cooling treatment: the heat-treated ultra-thin, wide, precision foil of S2 is subjected to 2-stage cooling treatment in the quenching zone. The quenching zone is a 2-stage cooling zone with a cooling rate of 80℃ / s and a frequency of ≤50 Hz to achieve real-time dynamic locking of the grain size and morphology, and a cooled ultra-thin, wide, precision foil is obtained.

[0087] S4, post-processing: the cooled ultra-thin, wide, precision foil of S3 is sent to an acid pickling or surface passivation section for processing to obtain a finished micron-level precision foil with flat shape and excellent surface quality.

[0088] Comparative Example 1

[0089] The furnace body structure is substantially the same as that of Example 1, except that the furnace zone length of the continuous annealing furnace is <11 m, and the dynamic thermal field compensation control, two-stage quenching zone, and tension closed-loop shape control system are not provided, and the temperature control precision is lower: ±2℃.

[0090] The specific process of the super-thin, wide, and precision foil shape and property synergistic control continuous annealing process method of the present comparative example is as follows:

[0091] The stainless steel strip is sent into the continuous annealing furnace for annealing treatment, and the corresponding temperatures of the 8 sections of the annealing furnace are set to 820±2℃, 840±2℃, 860±2℃, 880±2℃, 900±2℃, 920±2℃, 940±2℃, and 960±2℃, and the corresponding excess oxygen concentrations are 3%, 3.3%, 3.5%, 3.8%, 4.0%, 4.3%, 4.5%, and 5%, respectively. The temperature of the cooling water is 20-25℃, and the pressure of the cooling water is 3-3.5MPa.

[0092] Comparative Example 2

[0093] Compared with Example 2, the present continuous annealing furnace is only suitable for heat treatment of TA pure titanium system foils, and the annealing process window is narrow, which cannot meet the annealing process requirements of various metal foils.

[0094] The specific process of the super-thin, wide, and precision foil shape and property synergistic control continuous annealing process method of the present comparative example is as follows: a 0.1×610mm titanium strip is subjected to finished product heat treatment in an argon-protected continuous annealing furnace, the heat treatment temperature is 650℃, the holding time is 0.5min, the argon purity is ≥99.99%, and the annealing tension is 0.1kN.

[0095] Comparative Example 3

[0096] Compared with Example 3, the grain size is larger, and the 10-grade grain size is not achieved.

[0097] The specific process of the super-thin, wide, and precision foil shape and property synergistic control continuous annealing process method of the present comparative example is as follows: the finished product coil bright annealing temperature is 1140℃, the holding time is 1min, and the speed is reduced by 8% on the basis of the conventional annealing TV; the flatness elongation is 0.6%. The grain size of the micron-level precision foil prepared in the present comparative example is 6-8 grade.

[0098] It can be seen from Comparative Examples 1-3 that each embodiment of the present application solves the problems of "coarse and uneven grain, unstable cooling, low yield, poor adaptability" and the like in the traditional annealing process by introducing an 11-meter long isothermal furnace body, dynamic thermal field compensation control, two-stage rapid cooling and shape-property synergistic tension control system. The material organization control capability is significantly improved, and the "unexpected leap" of multiple performance indicators is achieved, which has obvious innovation, practicality and industrial promotion value.

[0099] The above scheme provides an ultrathin and wide precision foil shape-property synergistic regulation and control continuous annealing process method, which can solve the technical problems of uneven thermal stress, poor organization reconstruction efficiency and large plate shape fluctuation of the traditional annealing furnace when processing ultrathin and wide foil, can effectively control the abnormal growth of grains, realize the fine grain structure of the foil, and improve the surface quality and mechanical properties of the ultrathin precision foil, and fill the technical gap of the ultrathin and wide precision foil in the consistency of plate shape and organization performance after annealing, which has positive significance for promoting the development of key technology industry in China.

[0100] The present application adopts continuous annealing process technology to prepare ultrathin and wide foil with excellent plate shape precision, uniformity of organization structure and excellent mechanical properties. The annealing process has high temperature control precision and good stability, which can greatly increase the production efficiency.

[0101] The present application sets up eight continuous isothermal zones (Zone 1~Zone 8) in the annealing section, and all the temperature zones are set to the same target value (such as 950℃, 1000℃ or 1100℃), which forms an isothermal platform, effectively reducing the thermal stress concentration of the strip caused by the transition of the temperature zone.

[0102] The present application is different from the traditional multi-temperature zone mode of "preheating-heating-soaking", which activates the organization reconstruction by temperature stability rather than gradient change; it can improve the organization uniformity and plate shape stability of ultrathin materials, and the eighth isothermal section is directly connected with the rapid cooling section, which realizes the locking of the grain state immediately after the recrystallization of the organization in the isothermal state through two-stage rapid cooling, avoiding the problem of secondary abnormal grain growth.

[0103] The present application is not only suitable for austenitic stainless steel, but also can be adapted to duplex stainless steel and titanium and titanium alloy materials. According to the temperature sensitivity of the recrystallization and grain size of the foil, the isothermal dynamic annealing parameters and curve platform of different alloy systems are adjusted by parameterizing the target temperature of the isothermal zone, the strip running speed and the cooling rate.

[0104] In summary, the method of the present application, compared with the conventional ultra-thin, wide and precise foil preparation method, obtains the finished micron-level precise foil with flat shape and excellent surface quality by sequentially passing through eight isothermal temperature zones and two rapid cooling zones in the annealing section; the preparation method does not need complex modification of the equipment, is suitable for industrialized continuous production, expands the material adaptation range and matches the differentiated temperature control path, significantly reduces the production cost, is simple and easy to operate, green and environmentally friendly, low in cost, short in process, high in efficiency, and beneficial to industrial large-scale production and popularization.

[0105] It should be understood that the term "and / or" herein merely describes an association relationship of associated objects, and indicates that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone, wherein A and B can be singular or plural. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects, but can also represent an "and / or" relationship, which can be understood according to the context before and after.

[0106] In the present application, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or the like means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, and c can be single or multiple.

[0107] It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of the processes should be determined according to their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0108] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide-width precision foil, characterized in that: The specific process of the continuous annealing process method for coordinated control of the shape properties of ultra-thin, wide precision foil is as follows: S1. Feeding of ultra-thin and wide precision foils: The cold-rolled and cleaned ultra-thin and wide precision foils are fed into a continuous annealing furnace, which is equipped with 8 isothermal zones and 2 rapid cooling zones. S2, heat treatment in 8 isothermal zones: The ultra-thin, wide-width precision foil of S1 is subjected to isothermal zone heat treatment in the 1st to 8th temperature zones to enable the grain structure to grow and nucleate quickly, thus obtaining heat-treated ultra-thin, wide-width precision foil; S3, 2-stage cooling treatment: The heat-treated ultra-thin, wide-width precision foil of S2 is sent to the rapid cooling zone for 2-stage cooling treatment to achieve real-time dynamic locking of the grain size and morphology, and obtain cooled ultra-thin, wide-width precision foil; S4, post-processing: The cooled ultra-thin, wide precision foil from S3 is sent to the pickling or surface passivation section for treatment to obtain a finished micron-level precision foil with a flat plate shape and excellent surface quality.

2. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide-width precision foil according to claim 1 is characterized in that: S1's ultra-thin and wide precision foils are micron-grade precision foils with a thickness of 0.02-0.2mm and a width of more than 600mm. The unwinding tension is set at 50-160KG, and the rewinding tension is set at 100-260KG.

3. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The ultra-thin, wide precision foils in S1 include 316L stainless steel foil or TA1 titanium foil. Each of the eight isothermal zones is equipped with a temperature control feedback system, including thermocouples, infrared thermometers, and foil transverse temperature balance control devices.

4. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The temperature in the 1st to 8th temperature zones in S2 is 1000~1100℃, the tension in the furnace is 8~10KG, and the length of each temperature zone is 1.375m.

5. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The heating method for the 1st to 8th temperature zones in S2 is upper / lower radiation tubes + convection circulation fans + thermocouple closed-loop control. The furnace pressure is 200~400Pa. In the isothermal section, the heating power, convection wind speed and radiation intensity of each section are slightly adjusted to achieve dynamic thermal field compensation control of the strip during operation.

6. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The temperature control accuracy of the 1st to 8th temperature zones in S2 is within ±1~2℃, the TV value is 0.5~3.0, the speed of ultra-wide precision foil is 20~40m / min, the dew point is -70~-75, and the circulation volume is 180~190.

7. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The atmosphere of the 1st to 8th temperature zones in S2 is hydrogen protective gas with a flow rate of 20~50m 3 / h.

8. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The annealing furnace is equipped with a multi-stage tension closed-loop control system with a tension range of 50 to 150 kg to achieve automatic adjustment of the operating status.

9. The continuous annealing process for coordinated control of the shape and properties of ultra-thin, wide precision foil according to claim 1 is characterized in that: The rapid cooling zone in S3 is a two-stage cooling zone with a cooling rate of 35~100℃ / s and a frequency of ≤50Hz.

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