Mirror surface rolling process for Hastelloy ultra-thin strip for second-generation high-temperature superconducting baseband

Abstract

The invention relates to a mirror surface rolling process for a Hastelloy ultra-thin strip for a second-generation high-temperature superconducting baseband, and belongs to the technical field of Hastelloy mirror surface rolling. The thickness of a raw material of the Hastelloy ultra-thin strip is 0.6-0.8 mm, and the width of the raw material of the Hastelloy ultra-thin strip is 280-300 mm; the thickness of a finished product ranges from 0.03 mm to 0.045 mm, the width of the finished product ranges from 280 mm to 300 mm, and the rolling technology of the finished product comprises the following steps of S1, first-stage rough rolling, S2, first-stage cleaning, S3, first-stage mechanical polishing, S4, second-stage medium rolling, S5, second-stage cleaning, S6, second-stage mechanical polishing, S7, third-stage finish rolling and S8, third-stage cleaning. The thinning efficiency of the Hastelloy ultra-thin strip is improved, surface parameters of a working roller are better transmitted to the surface of the strip through asymmetrical rolling, and the surface roughness of the strip is effectively reduced; and the surface roughness of the strip is controlled more accurately by controlling staged rolling, and finally mirror surface rolling is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of Hastelloy mirror rolling, and relates to a mirror rolling process of an ultra-thin Hastelloy strip for a second-generation high-temperature superconducting base strip. Background Art

[0002] With its excellent performance, high-temperature superconducting tapes have shown broad application prospects in key fields such as electricity, transportation, medical treatment, and military. For example, superconducting tapes play an indispensable role in products such as superconducting magnetic resonance imaging machines and superconducting cables. The second-generation high-temperature superconducting tapes, also known as coated conductors, are mainly prepared by multi-layer coating of yttrium barium copper oxide (YBCO) material on a nickel-based alloy substrate. This material has become the focus of global research due to its high irreversible field, low AC loss, and no need for precious metals. At present, one of the main technical routes for preparing the second-generation high-temperature superconducting tapes is to coat a buffer layer on the Hastelloy C276 substrate through ion beam assisted deposition technology (IBAD), and then coat the YBCO superconducting layer on the buffer layer.

[0003] Hastelloy C276 base strip is considered to be an ideal material for large-scale industrial production due to its excellent tensile properties, low thermal expansion coefficient, good ferromagnetism and low cost. In the application of the second-generation high-temperature superconducting tape, the Hastelloy C276 ultra-thin strip with a thickness of 0.03~0.10mm, a width of 10~1000mm and a surface roughness of less than 10nm is usually used. Companies in the United States, Japan and other countries use advanced mirror rolling mills to control the surface roughness of the base strip to below 10 nanometers, which significantly improves the performance of the coated superconductor. However, China's rolling level is limited by hardware conditions, resulting in a large surface roughness of the produced strip, which fails to meet the standards for direct coating of the buffer layer and the YBCO superconducting layer. The Hastelloy C276 base strip currently used in China relies on foreign imports. At present, the domestic industry only uses mechanical polishing technology for the surface of long metal strips with a thickness of more than 0.15 mm, while the thickness of the ultra-thin Hastelloy strips used for second-generation high-temperature superconductors is only 0.03~0.10 mm, and it is impossible to achieve the surface roughness standard by rolling and then mechanical polishing.

[0004] Patent No. 202110916068.4 discloses a single mirror rolling method for 1050 aluminum foil, which is mirror-rolled by controlling the surface roughness of the working roll, the diameter of the working roll, and the wrap angle between the aluminum strip and the roll. Since aluminum is a relatively soft metal, it is easy to form and roll the roll surface parameters on the strip surface to achieve mirror rolling. However, Hastelloy is a difficult-to-deform metal and is not suitable for the above-mentioned mirror rolling of aluminum strip. Patent No. 202210099059.5 discloses a production method for 200 series stainless steel 2B cold-rolled plate for mirror plate use, which is mirror-rolled by controlling the elements of 200 series stainless steel and hot rolling, solution treatment, shot blasting and pickling, cold rolling, annealing, pickling and other processes. However, the element content of Hastelloy is far different from that of 200 stainless steel, and it contains difficult-to-deform elements such as Mo and W, which is not suitable for the mirror rolling of the above-mentioned Hastelloy ultra-thin strip.

[0005] In view of the problems that the Hastelloy alloy cannot be mechanically polished after thinning and deformation, is difficult to deform, and changes the element content, the Hastelloy alloy ultra-thin strip cannot be mirror-rolled, and a Hastelloy alloy ultra-thin strip mirror rolling process is urgently needed. Summary of the invention

[0006] In view of this, in order to solve the above technical problems, the present invention provides a mirror rolling process for Hastelloy ultra-thin strip for second-generation high-temperature superconducting base tape. The process effectively controls the rolling efficiency, plate quality and surface roughness of the Hastelloy strip through phased asynchronous rolling, multi-stage mechanical polishing, multi-stage cleaning and other processes, thereby realizing the mirror rolling of the Hastelloy ultra-thin strip for second-generation high-temperature superconducting base tape.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A mirror rolling process for Hastelloy ultra-thin strip for second-generation high-temperature superconducting base strip, wherein the raw material of the Hastelloy ultra-thin strip has a thickness of 0.6-0.8 mm and a width of 280-300 mm; the finished product has a thickness of 0.03-0.045 mm and a width of 280-300 mm, and the rolling process comprises the following steps:

[0009] S1, the first stage of rough rolling: the Hastelloy raw material with a thickness of 0.6mm~0.8mm is thinned by an asynchronous rolling process to obtain a Hastelloy strip with a thickness of 0.3~0.35mm, a single-pass rolling reduction rate of 20%~30%, and a rolling speed of 50~80m / min;

[0010] S2, first stage cleaning: using alkaline cleaning, ultrasonic cleaning, water cleaning, and drying to clean the surface of the Hastelloy alloy strip in S1;

[0011] S3, the first stage of mechanical polishing: use a high-speed wheel to press the surface of the Hastelloy alloy strip for polishing, and clean the Hastelloy alloy strip again after polishing;

[0012] S4, the second stage of intermediate rolling: the Hastelloy alloy strip treated by S2 and S3 is thinned to 0.1~0.15mm through asynchronous rolling process, the single-pass rolling reduction rate is 15%~25%, and the rolling speed is 35~50m / min;

[0013] S5, second stage cleaning: using alkaline cleaning, ultrasonic cleaning, water cleaning, and drying to clean the surface of the Hastelloy alloy strip in S4;

[0014] S6, the second stage of mechanical polishing: use a high-speed wheel to press the surface of the Hastelloy alloy strip for polishing, and clean the Hastelloy alloy strip again after polishing;

[0015] S7, the third stage of finishing rolling: the Hastelloy alloy strip treated by S5 and S6 is thinned by an asynchronous rolling process to obtain a Hastelloy alloy strip with a thickness of 0.03-0.045 mm, a single-pass rolling reduction rate of 10%-20%, and a rolling speed of 25-35 m / min;

[0016] S8, the third stage of cleaning: the Hastelloy alloy strip in S7 is cleaned by a four-stage cleaning process of alkaline cleaning, ultrasonic cleaning, water cleaning and drying. The Hastelloy alloy strip after cleaning has a mirror effect.

[0017] Furthermore, the diameter of the working rolls on the asynchronous rolling equipment in the first stage rough rolling and the second stage intermediate rolling is 70~80mm; the surface roughness of the working rolls in the first stage rough rolling is Ra0.2~0.3μm, the working rolls are flat rolls, the rolling pressure is 30~40t, the speed ratio is 1.2~1.3, and the kinematic viscosity of the rolling oil is 8~10mm 2 / s, the maximum allowable particle size is 3μm; the surface roughness of the working roll in the second section is Ra0.1~0.2μm, the working roll uses a 0~5μm radian roll, the rolling pressure is 30~40t, the speed ratio is 1.15~1.25, and the kinematic viscosity of the rolling oil is 7~9mm 2 / s, the maximum allowable particle size is 2μm.

[0018] Furthermore, in the third stage of finishing rolling, the diameter of the working roll on the asynchronous rolling equipment is 50~55mm, the working roll is a polished roll with a surface roughness of Ra0.005~0.01μm, the working roll is a 5~10μm radian roll, the rolling pressure is 20~30t, the speed ratio is 1.1~1.2, and the kinematic viscosity of the rolling oil is 6~8mm 2 / s, the maximum allowable particle size is 1μm.

[0019] Furthermore, a pair of working rolls are replaced in each pass of the first rough rolling, the second intermediate rolling and the third finishing rolling to ensure that the parameters of the working roll surface remain uniform when rolling to the strip surface in each pass.

[0020] Furthermore, the alkali solutions in the first stage cleaning, the second stage cleaning and the third stage cleaning are 10%~15%, 6~10% and 3~6% sodium hydroxide solutions respectively, the ultrasonic frequencies are all 40KHz~80KHz, the drying section temperatures are respectively 100~150℃, 80~120℃ and 60~100℃, and the cleaning speeds are all 15~25m / min.

[0021] Furthermore, both the first stage mechanical polishing and the second stage mechanical polishing adopt the circulating spray Al 2 O 3 The polishing liquid is used to polish the surface of the Hastelloy alloy strip. The circulating spraying ensures that the abrasive in the polishing liquid is uniform during the strip polishing, and also plays a role in taking away the heat generated during polishing and lubrication.

[0022] Furthermore, the Al 2 O 3 The particle size in the polishing liquid is 25~50μm, the abrasive accounts for 8%~15%, the spray speed is 10~12L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 8~15MPa, and the polishing speed is 20~30m / min.

[0023] Furthermore, the Al 2 O 3 The particle size in the polishing liquid is 4~10μm, the abrasive accounts for 5%~10%, the spray speed is 8~10L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 2~10MPa, and the polishing speed is 15~25m / min.

[0024] Furthermore, long-haired polishing cloths include velvet, velvet, felt, etc. Long-haired polishing cloths can store more abrasives, have greater friction, polish the surface brightly, and better reduce surface roughness.

[0025] Furthermore, the surface roughness of the Hastelloy alloy strip after the first stage mechanical polishing and the second stage mechanical polishing are Ra0.3~0.6μm and Ra0.1~0.2μm respectively, which controls the surface roughness of the strip at the start of the second stage intermediate rolling and the third stage finishing rolling, and better controls the surface roughness of the strip in the final pass of the third stage finishing rolling.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention discloses a mirror rolling process for ultra-thin Hastelloy strip for second-generation high-temperature superconducting base strip, which adopts a staged asynchronous rolling process to roll the ultra-thin Hastelloy strip, thereby improving the thinning efficiency of the ultra-thin Hastelloy strip. The asynchronous rolling has the unique friction characteristics of the rubbing zone in the strip deformation zone, while reducing the rolling force, so that the surface parameters of the working roll are better transferred to the strip surface, effectively reducing the surface roughness of the strip.

[0028] 2. The present invention discloses a mirror rolling process for ultra-thin Hastelloy strips for second-generation high-temperature superconducting base strips. The process adopts a multi-stage mechanical polishing process. By controlling the surface roughness of the strip at the start of the second-stage intermediate rolling and the third-stage fine rolling, the surface roughness of the strip in the final rolling pass can be better controlled. The long-haired polishing cloth can store more abrasives, has a large friction effect, and a bright polished surface, which can better reduce the surface roughness. By controlling the working roll diameter, working roll curvature, surface roughness and roll changing process of each stage rolling, the surface quality and plate shape of the strip are improved, the surface roughness control of the strip is more precise, and finally mirror rolling is achieved.

[0029] 3. The present invention discloses a mirror rolling process for ultra-thin Hastelloy alloy strips for second-generation high-temperature superconducting base tapes. Through a multi-stage cleaning process, parameters such as alkali solution concentration, ultrasonic frequency, drying temperature, rolling oil viscosity and maximum particle size during rolling are controlled, thereby effectively reducing the problem of increased surface roughness of Hastelloy alloy caused by impurities during rolling and cleaning of ultra-thin Hastelloy alloy strips.

[0030] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0032] Figure 1 This is a rolling process flow chart of a mirror rolling process of an ultra-thin Hastelloy strip for a second-generation high-temperature superconducting base strip according to the present invention;

[0033] Figure 2 The macroscopic surface of the Hastelloy alloy strip after the mirror rolling process in the present invention;

[0034] Figure 3 The surface of the working roller after the third stage of precision rolling and polishing in the present invention is magnified 1000 times;

[0035] Figure 4This is a 5-fold magnified microscopic surface of the Hastelloy alloy strip after the mirror rolling process in the present invention. DETAILED DESCRIPTION

[0036] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0037] like Figure 1 The present invention shows a mirror rolling process of a Hastelloy ultra-thin strip for a second-generation high-temperature superconducting base strip. The raw material of the Hastelloy ultra-thin strip has a thickness of 0.6-0.8 mm and a width of 280-300 mm. The finished product has a thickness of 0.03-0.045 mm and a width of 280-300 mm. The rolling process includes the following steps:

[0038] S1. First stage rough rolling: The 0.6mm~0.8mm thick Hastelloy raw material is thinned by asynchronous rolling process to obtain Hastelloy strip with a thickness of 0.3~0.35mm, a single-pass rolling reduction rate of 20%~30%, a rolling speed of 50~80m / min, and a pair of working rolls are replaced for each pass. The diameter of the working roll on the asynchronous rolling equipment is 70~80mm, the surface roughness of the working roll is Ra0.2~0.3μm, the working roll is flat roll rolling, the rolling pressure is 30~40t, the speed ratio is 1.2~1.3, and the kinematic viscosity of the rolling oil is 8~10mm 2 / s, the maximum allowable particle size is 3μm.

[0039] S2, first stage cleaning: the surface of the Hastelloy alloy strip in S1 is cleaned by a four-stage cleaning process of alkali cleaning, ultrasonic cleaning, water cleaning and drying. Among them, the alkali solution is a 10%~15% sodium hydroxide solution, the ultrasonic frequency is 40KHz~80KHz, the drying section temperature is 100~150℃, and the cleaning speed is 15~25m / min.

[0040] S3, the first stage of mechanical polishing: use high-speed wheels to press the surface of the Hastelloy alloy strip for polishing, and then clean the Hastelloy alloy strip again after polishing. 2 O 3 Polishing liquid for Hastelloy strip surface polishing, Al 2 O 3The particle size in the polishing liquid is 25~50μm, the abrasive accounts for 8%~15%, the spray speed is 10~12L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 8~15MPa, and the polishing speed is 20~30m / min.

[0041] S4, the second stage of intermediate rolling: the thickness of 0.3mm~0.35mm Hastelloy alloy strip is thinned to 0.1~0.15mm through asynchronous rolling process, the single-pass rolling reduction rate is 15%~25%, the rolling speed is 35~50m / min, and a pair of working rolls are replaced for each pass. The diameter of the working rolls on the asynchronous rolling equipment is 70~80mm, the surface roughness of the working rolls is Ra0.1~0.2μm, the working rolls use 0~5μm radian rolls, the rolling pressure is 30~40t, the speed ratio is 1.15~1.25, and the kinematic viscosity of the rolling oil is 7~9mm 2 / s, the maximum allowable particle size is 2μm.

[0042] S5, second stage cleaning: the surface of the Hastelloy alloy strip in S4 is cleaned by a four-stage cleaning process of alkali cleaning, ultrasonic cleaning, water cleaning and drying. Among them, the alkali solution is 6~10% sodium hydroxide solution, the ultrasonic frequency is 40KHz~80KHz, the drying section temperature is 80~120℃, and the cleaning speed is 15~25m / min.

[0043] S6, the second stage of mechanical polishing: use high-speed wheels to press the surface of the Hastelloy alloy strip for polishing, and then clean the Hastelloy alloy strip again after polishing. 2 O 3 Polishing liquid for Hastelloy strip surface polishing, Al 2 O 3 The particle size in the polishing liquid is 4~10μm, the abrasive accounts for 5%~10%, the spray speed is 8~10L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 2~10MPa, and the polishing speed is 15~25m / min.

[0044] S7, the third stage of finishing rolling: the thickness of 0.1mm~0.15mm Hastelloy alloy strip is thinned by asynchronous rolling process to obtain Hastelloy alloy strip with a thickness of 0.03~0.045mm, the single-pass rolling reduction rate is 10%~20%, the rolling speed is 25~35m / min, and a pair of working rolls are replaced for each pass. The diameter of the working roll on the asynchronous rolling equipment is 50~55mm, the working roll is a polished roll with a surface roughness of Ra0.005~0.01μm, the working roll is a 5~10μm radian roll, the rolling pressure is 20~30t, the speed ratio is 1.1~1.2, and the kinematic viscosity of the rolling oil is 6~8mm 2 / s, the maximum allowable particle size is 1μm.

[0045] S8, the third stage of cleaning: the Hastelloy alloy strip in S7 is cleaned by a four-stage cleaning process of alkali cleaning, ultrasonic cleaning, water cleaning and drying. The Hastelloy alloy strip after cleaning has a mirror effect. The alkali solution is 3~6% sodium hydroxide solution, the ultrasonic frequency is 40KHz~80KHz, the drying section temperature is 60~100℃, and the cleaning speed is 15~25m / min.

[0046] Long-haired polishing cloths include velvet, velvet, felt, etc. Long-haired polishing cloths can store more abrasives, have greater friction, polish the surface brightly, and better reduce surface roughness.

[0047] The surface roughness of the Hastelloy alloy strip after the first stage mechanical polishing and the second stage mechanical polishing are Ra0.3~0.6μm and Ra0.1~0.2μm respectively, which controls the surface roughness of the strip at the start of the second stage intermediate rolling and the third stage finishing rolling, and better controls the surface roughness of the strip in the final pass of the third stage finishing rolling.

[0048] Example 1

[0049] The Hastelloy raw material with a specification of 0.6x280mm is selected for mirror rolling process, and the final product specification is 0.03×280mm Hastelloy ultra-thin strip, and the surface of the strip is mirror-like. Figure 2 shown.

[0050] The rolling process includes the following steps:

[0051] S1. First stage rough rolling: Asynchronous cold rolling of 0.6mm thick Hastelloy raw material. During rolling, rolling oil is circulated and filtered and sprayed to the contact point between the roll and the strip to protect the strip surface. The kinematic viscosity of the rolling oil is 9mm 2 / s, the maximum allowable particle size is 3μm; a working roll with a diameter of 80mm is used for rolling, and the specific rolling parameters are as shown in the following table.

[0052] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.60 0.48 2740 3100 1.2 30 70 Ra0.3 Flat roller 2 0.48 0.38 2560 2740 1.2 35 70 Ra0.2 Flat roller 3 0.38 0.30 2350 2560 1.2 35 60 Ra0.2 Flat roller

[0053] S2. The first stage of cleaning: The first stage is alkaline cleaning with 10% sodium hydroxide solution, the second stage is 60KHz ultrasonic cleaning, the third stage is clean water cleaning of the strip surface, and the fourth stage is cleaning and drying the strip surface at a temperature of 150°C to ensure that the rolling oil and other particulate impurities on the strip surface are completely removed to ensure that there is no interference from other impurities during subsequent rolling.

[0054] S3, the first stage of mechanical polishing: the surface of the strip is mechanically polished using a high-speed wheel wrapped with felt. During polishing, Al2O3 with a particle size of 30 μm and abrasive accounting for 10% is sprayed on the surface of the strip. 2 O3 The polishing liquid is sprayed at a speed of 12L / min. The circulation spraying ensures that the abrasive in the polishing liquid is uniform during the strip polishing, and also takes away the heat generated during polishing and lubricates. The pressure of the polishing wheel on the strip surface is 12MPa, and the polishing speed is 30m / min. Finally, the polished surface is cleaned to remove the granular impurities on the surface after polishing; the surface roughness of the Hastelloy alloy strip after polishing is Ra0.3μm.

[0055] S4, the second stage of intermediate rolling: the 0.3mm thick Hastelloy semi-finished product is subjected to asynchronous cold rolling, and the kinematic viscosity of the rolling oil is 8mm 2 / s, the maximum allowable particle size is 2μm; a working roll with a diameter of 75mm is used for rolling, and the specific rolling parameters are as shown in the following table.

[0056] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.30 0.24 1810 2350 1.2 35 45 Ra0.2 1 2 0.24 0.19 1540 1810 1.2 35 45 Ra0.2 1 3 0.19 0.15 1210 1540 1.2 35 40 Ra0.2 3 4 0.15 0.12 975 1210 1.15 35 40 Ra0.1 3 5 0.12 0.10 821 975 1.15 30 40 Ra0.1 4

[0057] S5. The second stage of cleaning: The first stage is 8% sodium hydroxide solution for alkaline cleaning, the second stage is 50KHz ultrasonic cleaning, the third stage is clean water to clean the strip surface, and the fourth stage is 100°C temperature to clean and dry the strip surface to ensure that the rolling oil and other particulate impurities on the strip surface are completely removed to ensure that there are no other impurities interfering during subsequent rolling.

[0058] S6, the second stage of mechanical polishing: the surface of the strip is mechanically polished using a high-speed wheel wrapped with felt. During polishing, Al2O3 with a particle size of 10 μm and abrasive accounting for 10% is sprayed on the surface of the strip. 2 O 3 The polishing liquid is sprayed at a speed of 8L / min, the pressure of the polishing wheel on the strip surface is 5MPa, the polishing speed is 20m / min, and finally the polished surface is cleaned to remove granular impurities on the polished surface; the surface roughness of the Hastelloy alloy strip after polishing is Ra0.15μm.

[0059] S7, the third stage of finishing rolling: the 0.1mm thick Hastelloy semi-finished product is subjected to asynchronous cold rolling, and the kinematic viscosity of the rolling oil is 7mm 2 / s, the maximum allowable particle size is 1μm; the working roll with a diameter of 50mm is used for rolling, and the working rolls are polished rolls. The surface of the polished working rolls is magnified 1000 times. Figure 3 As shown, the polishing marks on the roller surface are consistent and there are no obvious scratches. The specific rolling parameters are shown in the following table.

[0060] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.100 0.080 643 821 1.2 30 35 Ra0.01 5 2 0.080 0.064 525 643 1.2 30 35 Ra0.01 5 3 0.064 0.051 420 525 1.2 25 35 Ra0.01 8 4 0.051 0.043 340 420 1.15 25 30 Ra0.01 8 5 0.043 0.036 270 340 1.15 25 30 Ra0.005 10 6 0.036 0.030 257 270 1.1 20 30 Ra0.005 10

[0061] S8, the third stage of cleaning: the first stage is 6% sodium hydroxide solution for alkaline cleaning, the second stage is 80KHz ultrasonic cleaning, the third stage is water cleaning of the strip surface, and the fourth stage is 80℃ temperature to clean and dry the strip surface. After cleaning, the Hastelloy alloy ultra-thin strip has a mirror effect, and its macroscopic surface is as follows Figure 2 As shown, the microscopic surface Figure 4 shown.

[0062] Example 2

[0063] The Hastelloy alloy raw material with a specification of 0.8x300mm was selected for the mirror rolling process, and the final product specification was a Hastelloy alloy ultra-thin strip with a specification of 0.042×300mm, and the surface of the strip had a mirror effect.

[0064] The rolling process includes the following steps:

[0065] S1. First stage rough rolling: Asynchronous cold rolling of 0.8mm thick Hastelloy raw material. During rolling, rolling oil is circulated and filtered and sprayed to the contact point between the roll and the strip to protect the strip surface. The kinematic viscosity of the rolling oil is 10mm 2 / s, the maximum allowable particle size is 3μm; a working roll with a diameter of 70mm is used for rolling, and the specific rolling parameters are as shown in the following table.

[0066] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.80 0.56 3530 5040 1.3 40 80 Ra0.3 Flat roller 2 0.56 0.44 3065 3530 1.2 40 80 Ra0.3 Flat roller 3 0.44 0.35 2730 3065 1.2 40 70 Ra0.2 Flat roller

[0067] S2. The first stage of cleaning: The first stage is alkaline cleaning with 15% sodium hydroxide solution, the second stage is 70KHz ultrasonic cleaning, the third stage is clean water cleaning of the strip surface, and the fourth stage is cleaning and drying the strip surface at a temperature of 150°C.

[0068] S3, the first stage of mechanical polishing: the surface of the strip is mechanically polished using a high-speed wheel wrapped with felt. During polishing, Al2O3 with a particle size of 50 μm and abrasive accounting for 15% is sprayed on the surface of the strip. 2 O 3 The polishing liquid is sprayed at a speed of 10L / min, the pressure of the polishing wheel on the strip surface is 10MPa, the polishing speed is 25m / min, and finally the polished surface is cleaned to remove granular impurities on the polished surface; the surface roughness of the Hastelloy alloy strip after polishing is Ra0.5μm.

[0069] S4, the second stage of intermediate rolling: the 0.35mm thick Hastelloy semi-finished product is subjected to asynchronous cold rolling, and the kinematic viscosity of the rolling oil is 9mm 2 / s, the maximum allowable particle size is 2μm; a working roll with a diameter of 70mm is used for rolling, and the specific rolling parameters are as shown in the following table.

[0070] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.35 0.26 2640 2730 1.25 40 50 Ra0.2 3 2 0.26 0.21 1630 2640 1.2 40 40 Ra0.2 3 3 0.21 0.17 1420 1630 1.15 38 40 Ra0.2 3 4 0.17 0.15 1260 1420 1.15 35 40 Ra0.1 5

[0071] S5. Second stage cleaning: The first stage is alkaline cleaning with 10% sodium hydroxide solution, the second stage is 70KHz ultrasonic cleaning, the third stage is clean water cleaning of the strip surface, and the fourth stage is cleaning and drying the strip surface at 120°C to ensure that the rolling oil and other particulate impurities on the strip surface are completely removed, and to ensure that there is no interference from other impurities during subsequent rolling.

[0072] S6, the second stage of mechanical polishing: the surface of the strip is mechanically polished using a high-speed wheel wrapped with felt. During polishing, Al2O3 with a particle size of 4μm and an abrasive ratio of 8% is sprayed on the surface of the strip. 2 O 3 The polishing liquid is sprayed at a speed of 10L / min, the pressure of the polishing wheel on the strip surface is 8MPa, the polishing speed is 25m / min, and finally the polished surface is cleaned to remove granular impurities on the polished surface; the surface roughness of the Hastelloy alloy strip after polishing is Ra0.2μm.

[0073] S7, the third stage of finishing rolling: the 0.15mm thick Hastelloy semi-finished product is subjected to asynchronous cold rolling, and the kinematic viscosity of the rolling oil is 8mm 2 / s, the maximum allowable particle size is 1μm; a working roll with a diameter of 50mm is used for rolling, and the specific rolling parameters are as shown in the following table.

[0074] path Entrance thickness / mm Export thickness / mm Front tension / Kg After tension / Kg Speed ​​ratio Rolling pressure / t Rolling speed m / min Working roll surface roughness / μm Working roll arc / μm 1 0.150 0.120 1008 1260 1.2 30 35 Ra0.01 5 2 0.120 0.096 806 1008 1.2 30 35 Ra0.01 5 3 0.096 0.076 640 806 1.2 30 35 Ra0.01 8 4 0.076 0.065 510 640 1.15 25 30 Ra0.08 8 5 0.065 0.055 423 510 1.15 25 25 Ra0.005 8 6 0.055 0.049 380 423 1.1 20 25 Ra0.005 10 7 0.049 0.045 335 380 1.1 20 25 Ra0.005 10

[0075] S8, the third stage of cleaning: the first stage is 4% sodium hydroxide solution for alkaline cleaning, the second stage is 70KHz ultrasonic cleaning, the third stage is clean water stage to clean the strip surface, and the fourth stage is 100℃ temperature to clean and dry the strip surface. After cleaning, the Hastelloy ultra-thin strip has a mirror effect.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A mirror rolling process for ultra-thin Hastelloy strip for second-generation high-temperature superconducting base tape, characterized in that: The Hastelloy ultra-thin strip raw material has a thickness of 0.6-0.8 mm and a width of 280-300 mm; the finished product has a thickness of 0.03-0.045 mm and a width of 280-300 mm, and the rolling process includes the following steps: S1, the first stage of rough rolling: the Hastelloy raw material with a thickness of 0.6mm~0.8mm is thinned by an asynchronous rolling process to obtain a Hastelloy strip with a thickness of 0.3~0.35mm, a single-pass rolling reduction rate of 20%~30%, and a rolling speed of 50~80m / min; S2, first stage cleaning: using alkaline cleaning, ultrasonic cleaning, water cleaning, and drying to clean the surface of the Hastelloy alloy strip in S1; S3, the first stage of mechanical polishing: use a high-speed wheel to press the surface of the Hastelloy alloy strip for polishing, and clean the Hastelloy alloy strip again after polishing; S4, the second stage of intermediate rolling: the Hastelloy alloy strip treated by S2 and S3 is thinned to 0.1~0.15mm through asynchronous rolling process, the single-pass rolling reduction rate is 15%~25%, and the rolling speed is 35~50m / min; S5, second stage cleaning: using alkaline cleaning, ultrasonic cleaning, water cleaning, and drying to clean the surface of the Hastelloy alloy strip in S4; S6, the second stage of mechanical polishing: use a high-speed wheel to press the surface of the Hastelloy alloy strip for polishing, and clean the Hastelloy alloy strip again after polishing; S7, the third stage of finishing rolling: the Hastelloy alloy strip treated by S5 and S6 is thinned by an asynchronous rolling process to obtain a Hastelloy alloy strip with a thickness of 0.03-0.045 mm, a single-pass rolling reduction rate of 10%-20%, and a rolling speed of 25-35 m / min; S8, the third stage of cleaning: the Hastelloy alloy strip in S7 is cleaned by a four-stage cleaning process of alkaline cleaning, ultrasonic cleaning, water cleaning and drying. The Hastelloy alloy strip after cleaning has a mirror effect.

2. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 1, characterized in that: The diameter of the working rolls on the asynchronous rolling equipment in the first stage rough rolling and the second stage intermediate rolling is 70-80 mm; the surface roughness of the working rolls in the first stage rough rolling is Ra0.2-0.3 μm, the working rolls are flat rolls, the rolling pressure is 30-40 t, the speed ratio is 1.2-1.3, and the kinematic viscosity of the rolling oil is 8-10 mm 2 / s, the maximum allowable particle size is 3μm; the surface roughness of the working roll in the second section is Ra0.1~0.2μm, the working roll uses a 0~5μm radian roll, the rolling pressure is 30~40t, the speed ratio is 1.15~1.25, and the kinematic viscosity of the rolling oil is 7~9mm 2 / s, the maximum allowable particle size is 2μm.

3. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 2, characterized in that: The working roll diameter of the asynchronous rolling equipment in the third stage of finishing rolling is 50-55 mm, the working roll is a polished roll with a surface roughness of Ra0.005-0.01 μm, the working roll is a 5-10 μm radian roll, the rolling pressure is 20-30 t, the speed ratio is 1.1-1.2, and the kinematic viscosity of the rolling oil is 6-8 mm 2 / s, the maximum allowable particle size is 1μm.

4. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 3, characterized in that: A pair of working rolls are replaced in each pass of the first stage rough rolling, the second stage intermediate rolling and the third stage finishing rolling.

5. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 1, characterized in that: The alkali solutions in the first stage cleaning, the second stage cleaning and the third stage cleaning are 10%~15%, 6~10% and 3~6% sodium hydroxide solutions respectively, the ultrasonic frequencies are all 40KHz~80KHz, the drying section temperatures are respectively 100~150℃, 80~120℃ and 60~100℃, and the cleaning speeds are all 15~25m / min.

6. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 1, characterized in that: The first stage mechanical polishing and the second stage mechanical polishing both use circulating spraying Al2O3 polishing liquid to polish the surface of the Hastelloy alloy strip.

7. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 6, characterized in that: The particle size of the Al2O3 polishing liquid in the first stage of mechanical polishing is 25~50μm, the abrasive accounts for 8%~15%, the spray speed is 10~12L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 8~15MPa, and the polishing speed is 20~30m / min.

8. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in claim 6, characterized in that: The particle size of the Al2O3 polishing liquid in the second stage of mechanical polishing is 4~10μm, the abrasive accounts for 5%~10%, the spray speed is 8~10L / min, the surface of the polishing wheel is wrapped with long-haired polishing cloth, the polishing pressure is 2~10MPa, and the polishing speed is 15~25m / min.

9. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in any one of claims 7 to 8, characterized in that: The long-haired polishing cloth includes velvet, velvet and felt.

10. A mirror rolling process for ultra-thin Hastelloy alloy strip for second-generation high-temperature superconducting base tape as claimed in any one of claims 7 to 8, characterized in that: The surface roughness of the Hastelloy alloy strip after the first stage mechanical polishing and the second stage mechanical polishing are Ra0.3~0.6μm and Ra0.1~0.2μm respectively.

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