Transverse-punching-resistant zirconium alloy plate for positioning grillwork and preparation method of transverse-punching-resistant zirconium alloy plate

Abstract

The invention discloses a transverse punching-resistant zirconium alloy plate for a positioning grillwork and a preparation method of the transverse punching-resistant zirconium alloy plate, and belongs to the technical field of zirconium and zirconium alloy plate preparation. According to the preparation method disclosed by the invention, the pretreated zirconium alloy plate is sequentially subjected to primary cold rolling treatment, recrystallization annealing treatment and secondary cold rolling treatment, and the texture optimization of the zirconium alloy plate is realized through a rotary rolling method by setting the processes of primary cold rolling treatment and secondary cold rolling treatment with different rolling directions; by combining recrystallization annealing treatment, the zirconium alloy cold-rolled plate with the specific fTD value is obtained, and the problem that a traditional zirconium alloy plate is prone to cracking during transverse punching is effectively solved; the application process is reasonable in design, the plate preparation cost is low, and meanwhile the method can be suitable for preparation of other similar metal plates.

Description

Technical Field

[0001] The invention belongs to the technical field of zirconium and zirconium alloy plate preparation, and in particular relates to a transverse impact-resistant zirconium alloy plate for a positioning grid and a preparation method thereof. Background Art

[0002] Fuel assembly is one of the eight main equipment in nuclear power plants and the core component of nuclear power plant reactors. Spacer grids are used to clamp fuel rods in pressurized water reactors to maintain the normal operation of nuclear fuel assemblies. As an indispensable and important support in the field of nuclear power generation, spacer grids are in high temperature, high pressure and irradiation environments for a long time, and the working environment is harsh and complex.

[0003] Due to its good resistance to high temperature and high pressure, radiation resistance and processability, zirconium alloy is currently the main material for preparing spacer grids at home and abroad. TD The value is low (about 0.22), which is easy to deform under long-term irradiation, reducing the service life of the spacer grid. In addition, the current domestic spacer grid is mainly obtained by transverse punching, and the lower f TD The value can easily lead to cracking in the zirconium alloy during the punching process.

[0004] Studies have shown that when the zirconium alloy TD When the value is 0.33, its irradiation growth can be effectively suppressed. In this case, the lattice holes of the zirconium alloy positioning lattice have the best dimensional stability, which can effectively improve the service life of the nuclear fuel assembly. At the same time, the f of the zirconium alloy should be appropriately increased. TD The value is conducive to the activation of the basal, cylindrical and conical sliding in the alloy, thus improving its plastic deformation ability. The texture evolution of the plate during rolling is closely related to the rolling plane and the amount of rolling reduction. The texture of the zirconium alloy plate after rolling usually evolves towards the basal texture, resulting in f TD The value is further reduced. After one face-changing rolling, the prismatic Slip is rapidly activated and the texture of the plate changes greatly with the amount of deformation, which brings challenges to adjusting the texture of Zr alloy with a given amount. Summary of the invention

[0005] The object of the present invention is to provide a transverse punching resistant zirconium alloy plate for a spacer grid and a preparation method thereof, so as to solve the technical problem that the current transverse punching performance of zirconium alloy for spacer grid is poor.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses a method for preparing a transverse punch-resistant zirconium alloy plate for a spacer grid, comprising the following steps: The zirconium alloy plate is pretreated, and then sequentially subjected to a first cold rolling treatment, a recrystallization annealing treatment and a second cold rolling treatment to obtain a transverse punching-resistant zirconium alloy plate for a spacer grid.

[0007] Furthermore, the pretreatment includes cleaning and polishing the surface of the zirconium alloy plate in sequence; The cleaning treatment is to first rinse with water for 2 to 3 times, then scrub with acetone for 3 to 5 minutes, and then rinse with water for 3 to 5 times.

[0008] Furthermore, the temperature of the water washing is 25-40°C, and the temperature of the acetone scrubbing is 25-30°C.

[0009] Furthermore, the surface of the zirconium alloy plate is polished to a depth of 10-20 μm; The grinding time is 5 to 10 minutes; The grinding process is performed using 400#~2000# SiC sandpaper.

[0010] Furthermore, the first cold rolling treatment has a rolling reduction of 50% and a temperature of room temperature.

[0011] Furthermore, the first cold rolling treatment is performed along the ND-RD plane and the RD direction of the zirconium alloy plate.

[0012] Furthermore, the temperature of the recrystallization annealing treatment is 550-580° C., and the time is 1-2 hours.

[0013] Furthermore, the second cold rolling treatment has a rolling reduction of 10% to 40% and a temperature of room temperature.

[0014] Furthermore, the second cold rolling treatment is performed along the TD-RD plane and the RD direction of the zirconium alloy plate.

[0015] The present invention also discloses a zirconium alloy plate material for a spacer frame that is resistant to transverse impact and is prepared by the above-mentioned preparation method. TD The values ​​are 0.289~0.649.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a method for preparing a transverse punching resistant zirconium alloy plate for a spacer grid, wherein the pretreated zirconium alloy plate is subjected to a first cold rolling treatment, a recrystallization annealing treatment and a second cold rolling treatment in sequence, and the texture of the zirconium alloy plate is optimized by setting the first cold rolling treatment and the second cold rolling treatment process in different rolling directions, and a specific f is obtained by combining the recrystallization annealing treatment. TD The zirconium alloy cold-rolled plate with high value has achieved texture optimization of the zirconium alloy plate, which makes it easier to activate the sliding of the base surface, cylindrical surface and conical surface, thereby improving the plastic deformation capacity of the zirconium alloy for the positioning grid, and improving the transverse punching performance of the zirconium alloy for the positioning grid, thus solving the technical problem of poor transverse punching performance of the zirconium alloy for the positioning grid.

[0017] Furthermore, the preparation method disclosed in the present invention has a simple process, can realize the quantitative control of the texture of the zirconium alloy plate, and effectively improve the problem that the traditional zirconium alloy plate is easy to crack during transverse punching; the application process is reasonably designed, the plate preparation cost is low, and it can be applied to the preparation of other similar metal plates. TD The value also helps to increase the service life of the zirconium alloy spacer grid and save costs.

[0018] Furthermore, during the preparation process, the zirconium alloy plate was first cold rolled along the ND-RD plane and the RD direction using a laboratory rolling mill, which was helpful for the zirconium alloy f TD The value of f is significantly increased; the temperature of the first rolling treatment is room temperature, the rolling reduction is 50%, and the final TD The zirconium alloy cold-rolled sheet has a value of 0.638; the recrystallization annealing temperature after the first cold rolling is 580℃ and the time is 1h, which helps to stabilize the texture of the zirconium alloy sheet after the first rolling and facilitates the second rolling; the zirconium alloy sheet is cold-rolled for the second time along the TD-RD plane and RD direction using a laboratory rolling mill, which helps the zirconium alloy f TD The value gradually decreases; the first rolling temperature is room temperature, the rolling reduction is 10%~40%, and finally f TD Zirconium alloy cold rolled plate with a value between 0.289 and 0.649.

[0019] Furthermore, the surface of the zirconium alloy plate is rinsed with water for 2 to 3 times, then brushed with acetone for 3 to 5 minutes, and then rinsed with water for 3 to 5 times. After cleaning, surface contaminants such as oil stains on the surface of the zirconium alloy are removed; the temperature of water rinsing is 25 to 40°C, and the temperature of acetone brushing is 25 to 30°C, which is more conducive to removing oil stains on the surface of the zirconium alloy.

[0020] Furthermore, grinding the surface of the zirconium alloy plate to a depth of 10-20 μm is helpful to remove the oxide layer on the surface of the zirconium alloy plate, which makes it easier for the plate to undergo uniform plastic deformation. The grinding time is 5-10 minutes, which can effectively avoid problems such as surface defects caused by too long grinding time and oxide layer residue caused by too short grinding time. Using 400#, 800#, and 1000# SiC sandpaper to grind the surface of the zirconium alloy plate in turn can improve the grinding efficiency of the oxide layer and obtain better zirconium alloy surface quality.

[0021] The present invention also discloses a zirconium alloy plate material for a spacer frame that is resistant to transverse impact and is prepared by the above-mentioned preparation method. TD The value (texture component of the plate along the TD direction) is between 0.289 and 0.649. It has excellent plastic deformation ability in room temperature compression tests, which helps to solve process problems such as transverse punching cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the rolling process of the first cold rolling treatment and the second cold rolling treatment of the present invention; Figure 2 is the pole figure of the zirconium alloy plate before rolling; Figure 3 It is the pole figure after the first cold rolling treatment; Figure 4 It is the pole figure of different deformation amounts in the second cold rolling treatment; Among them: a-10% cold-rolled plate pole figure; b-20% cold-rolled plate pole figure; c-30% cold-rolled plate pole figure; d-35% cold-rolled plate pole figure; e-140% cold-rolled plate pole figure; Figure 5 is the compression true stress-strain curve of zirconium alloy plate before rolling; Figure 6This is the compressive true stress-strain curve of the zirconium alloy plate after the second cold rolling treatment. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0024] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0025] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0026] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0027] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0028] The present invention provides a method for preparing a transverse punch-resistant zirconium alloy plate for a spacer grid, comprising the following steps: Step 1: Clean the surface of zirconium alloy plate Place the zirconium alloy plate in a cleaning tank and rinse the remaining dirt on the plate surface with 25-40℃ water for 2-3 times; then scrub the plate surface with acetone at room temperature for 3-5 minutes to remove oil stains, and finally rinse with 25-40℃ water for 3-5 times to remove the remaining acetone and stains on the plate surface; Step 2: Surface grinding of zirconium alloy plate The zirconium alloy plate after surface cleaning in step 1 is polished with 400#, 800#, and 1000# SiC sandpaper in sequence to remove the oxide layer on the surface of the plate; the polishing time is 5-10 minutes, and the grinding depth is 10-20 μm; Step 3: First cold rolling and recrystallization annealing like Figure 1 As shown in the figure, the zirconium alloy plate was first cold rolled along the ND-RD plane and RD direction using a laboratory rolling mill to increase its f TD The rolling temperature is room temperature, and the rolling reduction is 50%. The plate after rolling is subjected to recrystallization annealing at 580°C for 1 hour to facilitate the second cold rolling treatment. Among them, the pole figures of zirconium alloy plates before rolling are as follows: Figure 2 As shown, the pole figure after the first rotation rolling is as follows Figure 3 As shown, it can be seen that after the first rotation rolling, the c-axis of the grains in the plate is concentrated in TD, showing the texture characteristics of {0001}||TD.

[0029] Step 4: Second cold rolling The second cold rolling process, the rolling temperature is room temperature, the rolling reduction is 10%~40%, and the final product is f TD The value of zirconium alloy cold rolled plate is between 0.289 and 0.649; Among them, the pole figures of different deformation amounts in the second rolling are as follows Figure 4 As shown in the figure, it can be seen that during the second rotary rolling process, as the rolling reduction increases, the c-axis of the grains in the plate deflects from TD to ND and eventually forms a basal bimodal texture. TD The value gradually decreased from 0.649 to 0.289.

[0030] After testing, a room temperature compression test was used to simulate the punching process to verify the plastic deformation ability of the zirconium alloy plate after texture optimization. A compression specimen of 3.0 mm (ND) × 4.0 mm (RD) × 4.0 mm (TD) was cut from the rolled plate. The compression was carried out along the ND direction at a compression rate of 10 -3 mm / s. The compression test was carried out on an Instron 3382 electronic universal material testing machine. The original sample was used as a comparison during the whole process. The compression true stress-strain curves of the zirconium alloy samples before and after rotary rolling are shown in Figure 2. Figure 5 As shown in Figure 2, the strain hardening curves of the zirconium alloy specimens before and after rotary rolling are shown in Figure 2. Figure 6 shown.

[0031] from Figure 5 As can be seen from Figure 6, compared with the original sample, the transverse punching resistant zirconium alloy plate for the positioning grid prepared by the present invention has a lower yield strength in the room temperature compression test, a lower strain hardening rate in the uniform deformation stage, and remains stable in a wider strain range, indicating that it has better resistance to local deformation and fracture in the actual stamping process.

[0032] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0033] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0034] Example 1 A method for preparing a transverse impact-resistant zirconium alloy plate for a spacer grid comprises the following steps: Step 1: Clean the surface of zirconium alloy plate Place the zirconium alloy plate in a cleaning tank and rinse the remaining dirt on the plate surface with 25°C water for 2 times; then scrub the plate surface with acetone for 3 minutes at room temperature to remove oil stains, and finally rinse with 25°C water for 3 times to remove the remaining acetone and stains on the plate surface; Step 2: Surface grinding of zirconium alloy plate The zirconium alloy plate after surface cleaning in step 1 is polished with 400#, 800#, and 1000# SiC sandpaper in sequence to remove the oxide layer on the surface of the plate; the polishing time is 5 minutes, and the grinding depth is 15 μm; Step 3: First cold rolling and recrystallization annealing The zirconium alloy plate was first cold rolled along the ND-RD plane and RD direction using a laboratory rolling mill to increase its f TD The rolling temperature is room temperature, and the rolling reduction is 50%. The plate after rolling is subjected to recrystallization annealing at 580°C for 1 hour to facilitate the second cold rolling treatment. Step 4: Second cold rolling The zirconium alloy plate subjected to the first cold rolling treatment in step 3 is subjected to a second cold rolling treatment along the TD-RD plane and the RD direction using a laboratory rolling mill, the rolling temperature is room temperature, the rolling reduction is 10%, and finally a zirconium alloy cold rolled plate is obtained; The surface quality of the zirconium alloy plate prepared in this embodiment is good without obvious defects. The f TDThe value is 0.644; the yield strength after compression at room temperature is 236MPa, and the strain hardening rate in the uniform deformation stage is 435MPa, indicating that it has good resistance to local deformation and fracture.

[0035] Example 2 A method for preparing a transverse impact-resistant zirconium alloy plate for a spacer grid comprises the following steps: Step 1: Clean the surface of zirconium alloy plate Place the zirconium alloy plate in a cleaning tank and rinse the remaining dirt on the plate surface with 40°C water for 3 times; then scrub the plate surface with acetone for 5 minutes at room temperature to remove oil stains, and finally rinse with 30°C water for 5 times to remove the remaining acetone and stains on the plate surface; Step 2: Surface grinding of zirconium alloy plate The zirconium alloy plate after surface cleaning in step 1 was polished with 600#, 1000#, and 2000# SiC sandpaper in sequence to remove the oxide layer on the surface of the plate; the polishing time was 7 minutes, and the grinding depth was 10 μm; Step 3: First cold rolling and recrystallization annealing The zirconium alloy plate was first cold rolled along the ND-RD plane and RD direction using a laboratory rolling mill to increase its f TD The rolling temperature is room temperature, and the rolling reduction is 50%. The plate after rolling is subjected to recrystallization annealing at 580°C for 1 hour to facilitate the second cold rolling treatment. Step 4: Second cold rolling The zirconium alloy plate subjected to the first cold rolling treatment in step 3 is subjected to a second cold rolling treatment along the TD-RD plane and the RD direction using a laboratory rolling mill, the rolling temperature is room temperature, the rolling reduction is 30%, and finally a zirconium alloy cold rolled plate is obtained; The surface quality of the zirconium alloy plate prepared in this embodiment is good and has no defects. The f TD The value is 0.349; the yield strength after compression at room temperature is 247MPa, and the strain hardening rate in the uniform deformation stage is 585MPa, indicating that it has good resistance to local deformation and fracture.

[0036] Example 3 A method for preparing a transverse impact-resistant zirconium alloy plate for a spacer grid comprises the following steps: Step 1: Clean the surface of zirconium alloy plate Place the zirconium alloy plate in a cleaning tank and rinse the remaining dirt on the plate surface with 30°C water for 2 times; then scrub the plate surface with acetone for 5 minutes at room temperature to remove oil stains, and finally rinse with 25°C water for 4 times to remove the remaining acetone and stains on the plate surface; Step 2: Surface grinding of zirconium alloy plate The zirconium alloy plate after surface cleaning in step 1 is polished with 600#, 1000#, and 2000# SiC sandpaper in sequence to remove the oxide layer on the surface of the plate; the polishing time is 10 minutes, and the grinding depth is 20 μm; Step 3: First cold rolling and recrystallization annealing The zirconium alloy plate was first cold rolled along the ND-RD plane and RD direction using a laboratory rolling mill to increase its f TD The rolling temperature is room temperature, and the rolling reduction is 50%. The plate after rolling is subjected to recrystallization annealing at 580°C for 1 hour to facilitate the second cold rolling treatment. Step 4: Second cold rolling The zirconium alloy plate subjected to the first cold rolling treatment in step 3 is subjected to a second cold rolling treatment along the TD-RD plane and the RD direction using a laboratory rolling mill, the rolling temperature is room temperature, the rolling reduction is 35%, and finally a zirconium alloy cold rolled plate is obtained; The zirconium alloy plate prepared in this embodiment has no obvious defects on the surface. The f TD The value is 0.323; the yield strength after compression at room temperature is 266MPa, and the strain hardening rate in the uniform deformation stage is 650MPa, indicating that it has excellent resistance to local deformation and fracture.

[0037] Example 4 A method for preparing a transverse impact-resistant zirconium alloy plate for a spacer grid comprises the following steps: Step 1: Clean the surface of zirconium alloy plate Place the zirconium alloy plate in a cleaning tank and rinse the remaining dirt on the plate surface with 25°C water for 3 times; then scrub the plate surface with acetone for 3 minutes at room temperature to remove oil stains, and finally rinse with 30°C water for 3 times to remove the remaining acetone and stains on the plate surface; Step 2: Surface grinding of zirconium alloy plate The zirconium alloy plate after surface cleaning in step 1 is polished with 600#, 1000#, and 2000# SiC sandpaper in sequence to remove the oxide layer on the surface of the plate; the polishing time is 5 minutes, and the grinding depth is 10 μm; Step 3: First cold rolling and recrystallization annealing The zirconium alloy plate was first cold rolled along the ND-RD plane and RD direction using a laboratory rolling mill to increase its f TD The rolling temperature is room temperature, and the rolling reduction is 50%. The plate after rolling is subjected to recrystallization annealing at 580°C for 1 hour to facilitate the second cold rolling treatment. Step 4: Second cold rolling The zirconium alloy plate subjected to the first cold rolling treatment in step 3 is subjected to a second cold rolling treatment along the TD-RD plane and the RD direction using a laboratory rolling mill, the rolling temperature is room temperature, the rolling reduction is 40%, and finally a zirconium alloy cold rolled plate is obtained; The zirconium alloy plate prepared in this embodiment has no obvious defects. The f TD The value is 0.289; the yield strength after compression at room temperature is 286MPa, and the strain hardening rate in the uniform deformation stage is 825MPa, indicating that it has good resistance to local deformation and fracture.

[0038] Comparative Example S1. Cut compression specimens of 3.0 mm (ND) × 4.0 mm (RD) × 4.0 mm (TD) from the rolled plate; S2. Place the zirconium alloy plate in a cleaning tank and rinse the plate with 40°C clean water for 3 times; then scrub the surface of the plate with acetone at room temperature for 5 minutes, and finally rinse the plate with 25°C clean water for 5 times; S3, grinding the surface of the zirconium alloy plate after surface cleaning in step S1 with 600#, 1000#, and 2000# SiC sandpapers in sequence, with a grinding time of 10 min and a grinding depth of 20 μm; The zirconium alloy sample prepared in this comparative example has no obvious defects on the surface. The f TD The value is 0.224; the yield strength after compression at room temperature is 321MPa, and the strain hardening rate in the uniform deformation stage is 1150MPa. Its ability to resist local deformation and fracture is weaker than that of the rotary rolled sample.

[0039] In summary, the present invention provides a method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid, which realizes texture control of the zirconium alloy plate by rotary rolling, and prepares a zirconium alloy plate with a specific f TD The zirconium alloy cold-rolled plate with high value; the plastic deformation capacity of the zirconium alloy plate after texture optimization is improved, which solves the process problems such as transverse punching cracking of zirconium alloy used for positioning grid, prolongs the service life of nuclear fuel components and saves manufacturing costs.

[0040] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a transverse impact-resistant zirconium alloy plate for a spacer grid, characterized in that: The following steps are involved: The zirconium alloy plate is pretreated, and then sequentially subjected to a first cold rolling treatment, a recrystallization annealing treatment and a second cold rolling treatment to obtain a transverse punching-resistant zirconium alloy plate for a spacer grid.

2. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The pretreatment includes cleaning and grinding the surface of the zirconium alloy plate in sequence; The cleaning treatment is to first rinse with water for 2 to 3 times, then scrub with acetone for 3 to 5 minutes, and then rinse with water for 3 to 5 times.

3. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 2, characterized in that: The temperature of the water washing is 25-40°C, and the temperature of the acetone scrubbing is 25-30°C.

4. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 2, characterized in that: The depth of the grinding treatment on the surface of the zirconium alloy plate is 10-20 μm; The grinding time is 5 to 10 minutes; The grinding process is performed using 400#~2000# SiC sandpaper.

5. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The first cold rolling treatment has a rolling reduction of 50% and a temperature of room temperature.

6. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The first cold rolling process is performed along the ND-RD plane and the RD direction of the zirconium alloy plate.

7. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The temperature of the recrystallization annealing treatment is 550-580° C. and the time is 1-2 hours.

8. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The second cold rolling treatment has a rolling reduction of 10% to 40% and a temperature of room temperature.

9. The method for preparing a transverse impact resistant zirconium alloy plate for a spacer grid according to claim 1, characterized in that: The second cold rolling process is performed along the TD-RD plane and the RD direction of the zirconium alloy plate.

10. A zirconium alloy plate material resistant to transverse impact for a spacer grid, characterized in that: The method is used to prepare the spacer frame; the spacer frame is made of a zirconium alloy plate resistant to transverse punching. TD The values ​​are 0.289~0.649.

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