Preparation method of zirconium alloy pipe

Abstract

The invention belongs to the technical field of metal material processing, and particularly relates to a preparation method of a zirconium alloy pipe, which comprises the following steps: (1) rolling the zirconium alloy pipe; (2) performing fixed-length cutting on the rolled zirconium alloy pipe by adopting a double-core-rod circumferential shearing method; and (3) cleaning and drying the zirconium alloy pipe obtained in the step (2), and carrying out annealing treatment to obtain the zirconium alloy pipe. The preparation method of the zirconium alloy pipe has the beneficial effects that according to the preparation method of the zirconium alloy pipe, a double-core-rod circumferential shearing method is adopted for fixed-length cutting, so that the end opening of the pipe is free of burrs and flattening deformation; the preparation method of the zirconium alloy pipe is high in process controllability, high in preparation efficiency, controllable in quality and suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing, and particularly relates to a method for preparing a zirconium alloy pipe. Background Art

[0002] The conventional production process is used to process thin-walled short-length zirconium alloy tubes for nuclear fuel assemblies. The existing production of thin-walled short-length zirconium alloy tubes has the problem that the inner and outer diameters of the zirconium alloy tubes fluctuate greatly during the rolling process, the cut-to-length ports are easily deformed, and the finished products are easily flattened and deformed during annealing. The production efficiency is relatively low, and the requirements of mass production processes cannot be met, and the quality cannot be guaranteed. Summary of the invention

[0003] The present application provides a method for preparing a zirconium alloy pipe, aiming to solve the problems of low production efficiency and poor quality of existing zirconium alloy pipes.

[0004] The present application provides a method for preparing a zirconium alloy tube, comprising the following steps:

[0005] (1) Rolling the zirconium alloy tube;

[0006] (2) Cutting the rolled zirconium alloy tube to a fixed length using a double-mandrel circular shearing method;

[0007] (3) Cleaning and drying the zirconium alloy tube obtained in step (2), and annealing the zirconium alloy tube to obtain the zirconium alloy tube.

[0008] The preparation method of the zirconium alloy pipe described in the present application adopts a double-mandrel circumferential shearing method to cut to length, so that the pipe end is free of burrs and flattening deformation. The preparation method of the zirconium alloy pipe described in the present application has strong process controllability, high preparation efficiency, controllable quality, and is suitable for industrial production.

[0009] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, in step (1), the deformation amount of the zirconium alloy tube obtained by rolling is 70%-85%.

[0010] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, in step (3), the cleaning includes sequentially performing degreasing cleaning, rinsing and water washing on the zirconium alloy tube obtained in step (2).

[0011] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the degreasing and cleaning is performed by using a Dyna Purge barrel cleaning agent.

[0012] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the mass concentration of the Dyna Purge barrel cleaning agent is 5%-10%.

[0013] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the cleaning temperature of the Dyna Purge barrel cleaning agent is 45-82°C.

[0014] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, ultrasonic treatment is performed simultaneously with the degreasing and cleaning, and preferably, the frequency of the ultrasonic treatment is 20-40 KHz.

[0015] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the rinsing is performed by washing with softened water.

[0016] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the rinsing temperature is 40-80° C., and the rinsing time is 3-5 min.

[0017] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, ultrasonic treatment is performed simultaneously with the rinsing, and preferably, the frequency of the ultrasonic treatment is 20-40 KHz.

[0018] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the water washing is performed using deionized water.

[0019] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the conductivity of the deionized water is ≤10 μs·cm.

[0020] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the water washing temperature is 40-80° C., and the water washing time is 3-5 min.

[0021] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, ultrasonic treatment is performed simultaneously with the water washing, and preferably, the frequency of the ultrasonic treatment is 20-40 KHz.

[0022] According to some embodiments of the method for preparing the zirconium alloy tube described in the present application, the annealing temperature is 450-550° C., and the annealing time is 6-10 hours.

[0023] According to some embodiments of the method for preparing the zirconium alloy tube of the present application, the annealing pressure is ≤1.03×10 -2 Pa. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0025] The technical solution of the present application is described in detail below in conjunction with specific embodiments.

[0026] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] The present invention provides a method for preparing a zirconium alloy tube, comprising the following steps:

[0028] (1) Rolling the zirconium alloy tube;

[0029] (2) Cutting the rolled zirconium alloy tube to a fixed length using a double-mandrel circular shearing method;

[0030] (3) Cleaning and drying the zirconium alloy tube obtained in step (2), and annealing the zirconium alloy tube to obtain the zirconium alloy tube.

[0031] The preparation method of the zirconium alloy tube described in the present application adopts a double-mandrel circular shearing method to cut to length, so that the tube end is free of burrs and flattening deformation.

[0032] The method for preparing the zirconium alloy tube described in the present application has strong process controllability, high preparation efficiency, controllable quality, and is suitable for industrial production.

[0033] In some embodiments of the present application, in step (1), the deformation of the zirconium alloy tube obtained by rolling is 70%-85%. The preparation method described in the present application adopts a KPW25LC or KPW18LC two-roll rolling mill to roll the finished product. During the rolling process, the upper and lower hole profiles of the finished zirconium alloy tube are supported by metal cylinders instead of traditional butterfly springs, and the hole profile is adjusted to have no gap at the "zero" point to solve the problem of size fluctuation.

[0034] The upper and lower hole types are supported by metal cylinders. The roller assembly has a compact structure, high rolling rigidity, small vibration during the stable rolling process, and good consistency of pipe size. At the same time, it can improve the efficiency of rolling mold replacement and debugging, and can be widely used in the finished rolling of thin-walled pipes.

[0035] In some embodiments of the present application, in step (3), the cleaning includes sequentially subjecting the zirconium alloy tube obtained in step (2) to degreasing cleaning, rinsing and water washing.

[0036] In some embodiments of the present application, the degreasing cleaning is performed by using Dyna Purge barrel cleaning agent. Dyna Purge barrel cleaning agent, also known as Dyna screw flushing agent and Dyna barrel cleaning agent, is an original non-chemical, non-abrasive cleaning agent that can safely and effectively clean equipment.

[0037] In some embodiments of the present application, the mass concentration of the Dyna Purge cartridge cleaning agent is 5%-10%, for example, 5%, 6%, 7%, 8%, 9%, 10%, etc.

[0038] In some embodiments of the present application, the cleaning temperature of the Dyna Purge cartridge cleaning agent is 45-82°C, for example, 45°C, 48°C, 50°C, 60°C, 68°C, 72°C, 82°C, etc.

[0039] In some embodiments of the present application, ultrasonic treatment is performed while the oil removal and cleaning are performed simultaneously. The ultrasonic treatment can be performed while cleaning, and the tiny bubbles generated by the high-frequency sound wave vibration can burst and the shock wave generated can effectively remove impurities such as dirt, grease, coating, etc. attached to the surface of the object, thereby improving the cleaning efficiency.

[0040] In some embodiments of the present application, the frequency of the ultrasound is 20-40KHz, for example, 20KHz, 30KHz, 35KHz, 40KHz, etc.

[0041] In some embodiments of the present application, the rinsing is performed using softened water; softened water reduces the hardness of water by removing calcium, magnesium and other ions in the water, thereby reducing the generation of scale, which can prevent spots on the equipment after cleaning and reduce the formation of scale.

[0042] In some embodiments of the present application, the rinsing temperature is 40-80°C, for example, 40°C, 50°C, 60°C, 70°C, 80°C, etc.; the rinsing time is 3-5min, for example, 3min, 4min, 5min, etc.

[0043] In some embodiments of the present application, ultrasonic treatment is performed while rinsing, and ultrasonic treatment is performed while cleaning, which can improve cleaning efficiency.

[0044] In some embodiments of the present application, the frequency of the ultrasound is 20-40KHz, for example, 20KHz, 30KHz, 35KHz, 40KHz, etc.

[0045] In some embodiments of the present application, the water washing is performed with deionized water; deionized water effectively reduces the proportion of pollutants in the water by removing cations and anions in the water. Deionized water washing can effectively remove ionic impurities and pollutants on the surface of the object, thereby obtaining a clean and pure surface.

[0046] In some embodiments of the present application, the conductivity of the deionized water is ≤10 μs·cm, for example, 10 μs·cm, 9 μs·cm, 8 μs·cm, 6 μs·cm, 5 μs·cm, etc.

[0047] In some embodiments of the present application, the water washing temperature is 40-80°C, for example, 40°C, 50°C, 60°C, 70°C, 80°C, etc.

[0048] In some embodiments of the present application, the water washing time is 3-5 minutes, for example, 3 minutes, 4 minutes, 5 minutes, etc.

[0049] In some embodiments of the present application, ultrasonic treatment is performed simultaneously with water washing, which is beneficial to improving the efficiency of water washing.

[0050] In some embodiments of the present application, the frequency of the ultrasound is 20-40KHz, for example, 20KHz, 30KHz, 40KHz, etc.

[0051] In some embodiments of the present application, the annealing temperature is 450-550°C, for example, 450°C, 480°C, 500°C, 520°C, 550°C, etc., and the annealing time is 6-10h, for example, 6h, 7h, 8h, 10h, etc.

[0052] In some embodiments of the present application, the annealing pressure is ≤1.03×10 -2 Pa, for example 1.03×10 -2 Pa, 1.02×10 -2 Pa, 1.01×10 -2 Pa, 1.0×10 -2 Pa, 0.9×10 -2 Pa et al.

[0053] Specific implementation cases

[0054] A method for preparing a zirconium alloy tube comprises the following steps:

[0055] (1) The zirconium alloy tube is rolled, and the deformation of the zirconium alloy tube obtained by rolling is 70%; the finished zirconium alloy tube is rolled on the KPW18LC rolling mill. During the rolling process of the finished zirconium alloy tube, the upper and lower hole types are supported by metal cylinders instead of traditional butterfly springs, and the hole type is adjusted to have no gap at the "zero" point position, which solves the problem of size fluctuation. The rolling speed is 200 times / minute, the feed amount is 1mm / time, the external lubricant used in rolling is 10% T6312 lubricant, and the internal lubricant used in rolling is 40% T6312 lubricant.

[0056] (2) Cutting the rolled zirconium alloy tube to a fixed length using a double-mandrel circular shearing method;

[0057] (3) using Dyna Purge barrel cleaning agent with a mass concentration of 6% to degrease and clean the zirconium alloy pipe obtained in step (2), the degreasing cleaning temperature is 50°C, ultrasonic treatment is performed during the degreasing cleaning, and the ultrasonic frequency is set to 30KHz; using softened water to rinse the zirconium alloy pipe after degreasing and cleaning, setting the rinsing temperature to 50°C and the time to 5min, ultrasonic treatment is performed during the rinsing, and the ultrasonic frequency is set to 30KHz; using deionized water to wash the zirconium alloy pipe after rinsing, the conductivity of the deionized water is 10μs·cm, the washing temperature is set to 50°C and the time is 5min, ultrasonic treatment is performed during the washing, and the ultrasonic frequency is set to 30KHz;

[0058] The cleaned zirconium alloy pipe is dried in a drying oven at a working temperature of 90°C;

[0059] The dried pipes are loaded into stainless steel frames, with 200 pipes loaded into each frame. When the stainless steel frames are filled with pipes, two movable clamping beams are inserted into the opening surface of the frames to prevent the pipes from falling out of the frames. The stainless steel frames are then rotated to place them vertically in the annealing bin. The zirconium alloy pipes are placed vertically to prevent them from being flattened during annealing.

[0060] Annealing was carried out in a vacuum internal heating furnace at a temperature of 500°C for 8 h. The pressure of the annealing furnace was controlled so that the vacuum pressure was no greater than 1.03×10 -2 Pa, and after reaching the insulation temperature, fill with 500Pa of 99.998% purity argon. After the insulation is completed, cool for 10 hours and take out of the furnace.

[0061] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for preparing a zirconium alloy tube, characterized in that: The following steps are involved: (1) Rolling the zirconium alloy tube; (2) Cutting the rolled zirconium alloy tube to a fixed length using a double-mandrel circular shearing method; (3) Cleaning and drying the zirconium alloy tube obtained in step (2), and annealing the zirconium alloy tube to obtain the zirconium alloy tube.

2. The method for preparing a zirconium alloy tube according to claim 1, characterized in that: In step (1), the deformation amount of the zirconium alloy tube obtained by rolling is 70%-85%.

3. The method for preparing a zirconium alloy tube according to claim 1, characterized in that: In step (3), the cleaning comprises sequentially performing degreasing cleaning, rinsing and water washing on the zirconium alloy tube obtained in step (2).

4. The method for preparing a zirconium alloy tube according to claim 3, characterized in that: The degreasing and cleaning is performed by using Dyna Purge barrel cleaning agent.

5. The method for preparing a zirconium alloy tube according to claim 4, characterized in that: The mass concentration of the Dyna Purge barrel cleaning agent is 5%-10%; and / or, the cleaning temperature of the Dyna Purge barrel cleaning agent is 45-82°C; And / or, ultrasonic treatment is performed while the oil removal and cleaning, preferably, the frequency of the ultrasound is 20-40 KHz.

6. The method for preparing a zirconium alloy tube according to claim 4, characterized in that: The rinsing is performed by using softened water for cleaning; And / or, the rinsing temperature is 40-80°C, and the rinsing time is 3-5 minutes; And / or, ultrasonic treatment is performed while rinsing, and preferably, the frequency of the ultrasound is 20-40 KHz.

7. The method for preparing a zirconium alloy tube according to claim 4, characterized in that: The water washing is performed by using deionized water; Preferably, the conductivity of the deionized water is ≤10 μs·cm.

8. The method for preparing a zirconium alloy tube according to claim 7, characterized in that: The water washing temperature is 40-80°C, and the water washing time is 3-5min; And / or, ultrasonic treatment is performed simultaneously with the water washing, and preferably, the frequency of the ultrasound is 20-40 KHz.

9. The method for preparing a zirconium alloy tube according to claim 1, characterized in that: The annealing temperature is 450-550° C., and the annealing time is 6-10 hours.

10. The method for preparing a zirconium alloy tube according to claim 1, characterized in that: The annealing pressure is ≤1.03×10 -2 Pa.