CN111842532A - Zirconium alloy pipe preparation method and zirconium alloy pipe prepared based on method - Google Patents
Zirconium alloy pipe preparation method and zirconium alloy pipe prepared based on method Download PDFInfo
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- CN111842532A CN111842532A CN201910349393.XA CN201910349393A CN111842532A CN 111842532 A CN111842532 A CN 111842532A CN 201910349393 A CN201910349393 A CN 201910349393A CN 111842532 A CN111842532 A CN 111842532A
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- 229910001093 Zr alloy Inorganic materials 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 35
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 27
- 238000005097 cold rolling Methods 0.000 claims description 16
- 238000000137 annealing Methods 0.000 claims description 11
- 230000007547 defect Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 10
- 238000005238 degreasing Methods 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 8
- 238000001125 extrusion Methods 0.000 abstract description 6
- 238000009776 industrial production Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 229910017604 nitric acid Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 229910052735 hafnium Inorganic materials 0.000 description 2
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
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- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention discloses a preparation method of a zirconium alloy pipe, which comprises the following steps: performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank; heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet; carrying out second treatment on the pierced billet to prepare a pipe; straightening the pipe to obtain a semi-finished zirconium alloy pipe; and carrying out acid washing on the semi-finished zirconium alloy pipe to obtain a finished zirconium alloy pipe. The method has the advantages of simple process flow, short production period and 10% higher overall efficiency than that of the extrusion method; the yield of the perforation is 90 percent, and the yield is high; the production process is less, and the production efficiency is high; the production cost can be greatly reduced; the production equipment and the yield meet the conditions for producing the zirconium alloy seamless pipe on an industrial scale, and can meet the requirements of large-scale industrial production.
Description
Technical Field
The invention belongs to the technical field of zirconium alloy preparation, and particularly relates to a preparation method of a zirconium alloy pipe and the zirconium alloy pipe prepared based on the method.
Background
Zirconium metal is a high-melting-point metal with strong activity and high value, and with the development of economy in China, zirconium alloy seamless pipes with good corrosion resistance are used in the fields of petroleum, chemical engineering, oceans and the like in succession, so the demand for the zirconium alloy seamless pipes is increased year by year. In the prior art, the method for manufacturing the seamless tube of the zirconium alloy tube mainly adopts an extrusion and cold rolling method, the process technology of the method is easy to master, but the extrusion method has more process flows, particularly has long manufacturing procedures of producing an ingot blank, has large loss due to peeling and drilling a central guide hole on the ingot blank, has the general extrusion yield of only 75 percent, low production rate and large consumption of metal and tools and dies, and is difficult to meet the requirement of large-scale process production.
Disclosure of Invention
Objects of the invention
The invention aims to provide a preparation method of a zirconium alloy pipe and the zirconium alloy pipe prepared based on the method. To solve the above problems.
(II) technical scheme
In order to solve the above problems, a first aspect of the present invention provides a method for preparing a zirconium alloy pipe, including: performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank; heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet; carrying out second treatment on the pierced billet to prepare a pipe; straightening the pipe to obtain a semi-finished zirconium alloy pipe; and carrying out acid washing on the semi-finished zirconium alloy pipe to obtain a finished zirconium alloy pipe.
Further, the first processing includes: hot forging the zirconium alloy zirconium ingot into a rough bar blank; and cutting, polishing and centering the rough bar blank to obtain the bar blank.
Further, the diameter of the bar billet is 50 mm-130 mm.
Further, the length of the bar billet is 650-4500 mm.
Furthermore, the range of the centering hole of the bar blank is phi 18 +/-0.5 mm-phi 30 +/-0.5 mm.
Further, the first temperature ranges from 700 ℃ to 980 ℃.
Further, the perforating step is carried out by using a rolling unit, the rolling unit uses a water-cooling plug, and the perforating speed of the bar billet by the rolling unit is 0.2-0.5 mm/s; the perforation step conditions are as follows: the total diameter reduction rate of the bar billet is 9-16%, the pre-jacking reduction rate is 2.5-11%, and the outer diameter ovality coefficient is 1.13-1.20.
Further, the second processing includes: removing the defects on the inner surface and the outer surface of the pierced billet to obtain a pierced billet with a smooth surface; and carrying out cold rolling treatment on the pierced billet with the smooth surface for multiple times, and carrying out degreasing and vacuum annealing once after cold rolling is finished.
Further, the vacuum annealing temperature is 650-750 ℃, the time is 60-210 min, and the vacuum pressure is less than 1 x 10 -2Pa。
Further, the straightness of the semi-finished zirconium alloy pipe is less than 2.1 mm/m.
Furthermore, the removal amount of the pickling wall thickness is 0.05 mm-0.30 mm.
According to another aspect of the invention, a zirconium alloy pipe is provided, which is prepared by adopting the zirconium alloy pipe preparation method in any one of the above schemes.
The invention aims to protect a zirconium alloy pipe preparation method and a zirconium alloy pipe prepared based on the method, and the preparation method comprises the following steps: performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank; heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet; carrying out second treatment on the pierced billet to prepare a pipe; straightening the pipe to obtain a semi-finished zirconium alloy pipe; and carrying out acid washing on the semi-finished zirconium alloy pipe to obtain a finished zirconium alloy pipe. The method has the advantages of simple process and high yield, greatly improves the production efficiency, reduces the cost, saves a large amount of manpower and material resources, and improves the working efficiency and the utilization rate of raw materials.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
the process flow is simple, the production period is short, and the overall efficiency is 10% higher than that of the extrusion method; the yield of the perforation is 90 percent, and the yield is high; the production process is less, and the production efficiency is high; the production cost can be greatly reduced; the production equipment and the yield meet the conditions of industrial large-scale production of the zirconium alloy pipe and can meet the requirements of large-scale industrial production.
Drawings
Fig. 1 is a flowchart of a method for manufacturing a zirconium alloy pipe according to a first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a flowchart of a method for manufacturing a zirconium alloy pipe according to a first embodiment of the present invention.
As shown in fig. 1, in a first embodiment of the present invention, a method for preparing a zirconium alloy pipe is provided, including:
S1: performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank;
s2: heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet;
s3: carrying out second treatment on the pierced billet to prepare a pipe;
s4: straightening the pipe to obtain a semi-finished zirconium alloy pipe;
s5: and (4) carrying out acid pickling on the semi-finished zirconium alloy pipe to obtain the finished zirconium alloy pipe.
The finished zirconium alloy pipe is also inspected in this embodiment, including: water pressure detection and physical and chemical performance detection.
The process flow is simple, the production period is short, and the overall efficiency is 10% higher than that of the extrusion method; the yield is high; the production process is less, and the production efficiency is high; the production cost can be greatly reduced; the production equipment and the yield meet the conditions of industrial large-scale production of the zirconium alloy pipe and can meet the requirements of large-scale industrial production.
In the step S2, a two-roller inclined rolling mill set is used for punching, a water-cooling top is used, and the speed of punching the bar blank by the rolling mill set is 0.2-0.5 mm/S; the perforation step conditions are as follows: the total diameter reduction rate of the bar blank is 9-16%, the pre-jacking reduction rate is 2.5-11%, and the coefficient of ovality of the outer diameter is 1.13-1.20. Punching to obtain pierced billets, wherein the pierced billets have the size of phi 72-125 mm, the wall thickness of 5-20 mm and the length of 1500-6000 mm; the roller of the piercer rotates in the same direction, the axis of the roller inclines relative to the rolling line, after the bar blank enters the roller, the bar blank is driven by the friction force between the metal and the roller to rotate in the direction opposite to the rotation direction of the roller, and meanwhile, the roll axis of the roller has an inclination angle relative to the axis of the bar blank, and the bar blank moves axially, so the bar blank moves spirally. The basic parameters representing the spiral motion are: tangential movement speed, axial movement speed and displacement value of each half-turn of the tube blank. The water-cooled plug can reduce friction force, so that the perforating operation is smoother, high temperature generated by friction can be reduced, the activity is eliminated, and the perforated surface is smoother. The finished product zirconium alloy pipe has the outer diameter of phi 20-phi 89.0mm (phi represents the diameter) and the wall thickness of 1.0-16 mm. The yield of the perforation is 90 percent, the yield is high, and the production cost can be greatly reduced.
Optionally, the acid solution used for pickling comprises: nitric acid, hydrofluoric acid and water. The nitric acid and the hydrofluoric acid are both dissolved in water, have strong oxidizing property and corrosivity, and can effectively clean impurities and an oxidation layer on the surface of the pipe.
Optionally, the first processing includes:
s11: hot forging a zirconium alloy zirconium ingot into a rough bar blank;
s12: and cutting, polishing and centering the rough bar blank to obtain the bar blank.
The hot forging temperature is 950-1050 ℃, the plasticity of the zirconium alloy is improved, the deformation resistance is reduced, the zirconium alloy is easy to flow and form, and a good rough bar blank is obtained. The temperature range can effectively ensure the quality of the forged piece, improve the productivity of hot forging, and save the energy consumption without selecting overhigh temperature.
Polishing operation is used for polishing the surface defects of the blank of the stripping locomotive. The surface of the rough bar blank is smooth by polishing, so that the centering operation is convenient, and the centering accuracy is improved.
Alternatively, the rough bar stock may be cut by methods including, but not limited to, water cutting and band saw cutting.
Optionally, the diameter of the bar billet is 50 mm-130 mm.
Optionally, the length of the bar billet is 650 mm-4500 mm.
Optionally, the centering hole range of the bar blank is phi 18 +/-0.5 mm-phi 30 +/-0.5 mm.
Optionally, the centering operation is performed by using a horizontal centering machine.
Optionally, the first temperature is in the range of 700 ℃ to 980 ℃. The zirconium alloy bar blank at high temperature is fully softened, the difficulty of perforation operation is facilitated, and the efficiency of the whole smooth operation is improved.
Optionally, the second processing includes: removing the defects on the inner surface and the outer surface of the pierced billet to obtain the pierced billet with a smooth surface; and (3) carrying out cold rolling treatment on the pierced billet with the smooth surface for multiple times, and carrying out degreasing and vacuum annealing once after cold rolling is finished. Peeling or grinding the outer surface of the pierced billet, boring the inner surface of the pierced billet, and removing surface defects. The bore hole can enlarge the aperture, improve the precision, reduce the surface roughness and better correct the wall thickness deviation of the pipe. The scalping and grinding can not only remove the outer surface defects, but also more accurately carry out fine standard size on the pierced billet. The cold rolling is carried out by adopting a two-roller cold rolling unit, a multi-roller cold rolling unit, an KPW75 rolling mill, a KPW50 rolling mill and a KPW25 rolling mill, the two-roller cold rolling unit is an LG120, LG55 and LG30 two-roller cold rolling unit, and the multi-roller cold rolling unit is an LD60, LD30 and LG15 multi-roller cold rolling unit. The cold rolling can ensure the dimensional accuracy of the pipe and can obtain the surface of the pipe with good finish. The purpose of degreasing is to remove the lubricating grease attached to the rolled material during rolling, to prevent the surface of the pierced billet from being contaminated during annealing, and to prevent carburization.
Optionally, the vacuum annealing temperature is 650-750 ℃, the time is 60-210 min, and the vacuum pressure is less than 1 × 10-2Pa. The zirconium alloy pierced billet is recrystallized, the hardening after cold rolling is eliminated, and the plasticity is recovered to obtain the expected physical and physical chemical properties. The hardness of the zirconium alloy pierced billet is reduced, the cutting processability is improved, the residual stress is eliminated, the size is stabilized, and the deformation and crack tendency is reduced; improve the plasticity of the zirconium alloy pierced billet and prevent cracking. Refining grains, adjusting the structure and eliminating the structure defects. The material structure and the composition are uniform, the material performance is improved or the structure preparation is made for the later heat treatment. Zirconium element has strong affinity with gas, and reacts with oxygen, hydrogen and nitrogen at about 200, 300 and 400 ℃ respectively, and the reaction is rapid at higher temperature, so that the infiltration of other elements is completely isolated by adopting vacuum annealing.
Optionally, the straightness of the semi-finished zirconium alloy pipe is less than 2.1 mm/m. And straightening the semi-finished zirconium alloy pipe on six-roller or ten-roller straightening equipment. Cold rolled tubing patterns are typically open cross sections, making the cross section less free torsional stiffness. Torsion is likely to occur when the steel is bent, and bending, torsion and buckling are likely to occur when the steel is pressed, so that a straightening operation is required. Because the material to be straightened is a pipe and the length is long, the straightening operation can be carried out under the condition of least damage to the pipe by selecting a straightening machine with a large number of rollers.
Optionally, the removal amount of the pickling wall thickness is 0.05 mm-0.30 mm. And removing oxide skin and other impurities on the surface of the semi-finished zirconium alloy pipe by using acid liquor to achieve the effect of cleaning the surface of the semi-finished zirconium alloy pipe.
In another aspect, the embodiment of the present invention provides a zirconium alloy pipe, which is prepared by using the method for preparing a zirconium alloy pipe described in any one of the above embodiments. The zirconium alloy pipe comprises the chemical components (mass fraction) of zirconium and hafnium more than or equal to 95.5%, hafnium less than or equal to 4.5%, iron and chromium less than or equal to 0.2%, and niobium between 2.0% and 3.0%. Zirconium has excellent corrosion resistance to various acids (e.g., hydrochloric acid, nitric acid, sulfuric acid, and acetic acid), bases, and salts. The outer diameter of the finished pipe is phi 20 mm-phi 89.0mm, and the wall thickness is 1.0 mm-16 mm. The size of the finished pipe also meets the specification of the common pipe, and the finished pipe prepared in the range has high yield, so that the production cost can be greatly reduced.
Example 1: the method comprises the following steps: hot forging a zirconium alloy zirconium ingot into a zirconium alloy rough bar blank with phi 115 +/-3 mm; sawing the zirconium alloy rough bar blank with the length of 1200mm by using a band saw, and polishing the surface defects of the zirconium alloy rough bar blank by using a peeling machine. Centering by using a horizontal centering machine, wherein the centering hole range is phi 30mm +/-0.5 mm; heating a zirconium alloy bar blank to 950 ℃, perforating the zirconium alloy bar blank by using a two-roller inclined rolling mill set, using a water-cooling top, controlling the total diameter reduction rate to be 10%, controlling the pre-top reduction rate to be 4.5%, controlling the ovality coefficient to be 1.15, controlling the perforation speed to be 0.5mm/s, and perforating to obtain the zirconium alloy pierced billet. Peeling the outer surface of the zirconium alloy pierced billet and boring the inner surface of the zirconium alloy pierced billet to obtain a pierced billet with a smooth surface, the size of phi 105mm, the wall thickness of 9mm and the length of 4500 mm; then, an LG120 rolling mill is adopted for rolling, the rolling speed is 60 times/min, the feeding amount is 5 mm/time, and the rolling size is as follows: 
And (5) degreasing the rolled pipe. Annealing at 650 deg.C for 210min under vacuum pressure of less than 1 × 10-2Pa; straightening the zirconium alloy pipe on six-roller straightening equipment, wherein the straightness is less than 2.1 mm/m; the acid solution is prepared by nitric acid, hydrofluoric acid and water, and the removal amount of the wall thickness of the acid washing is 0.1 mm;
and (3) water pressure testing: the hydraulic pressure is 19.3 MPa, the time is kept for 5 seconds, and no leakage exists in the hydraulic pressure test of the pipe; chemical formation of gasAnd (3) testing: the content of hydrogen element is 0.002%, and the content of nitrogen element is 0.011%; testing room temperature tensile property: maximum tensile strength 612 MPa, yield strength 514 MPa, elongation 20%; and (3) detecting the size of the pipe:
example 2: the method comprises the following steps: hot forging a zirconium alloy zirconium ingot into a zirconium alloy rough bar blank with phi 115 +/-3 mm; the zirconium alloy rough bar blank with the rough bar blank length of 1200mm is sawed by a saw, and the surface defects of the zirconium alloy rough bar blank are polished by a peeling machine. Centering by using a horizontal centering machine, wherein the centering hole range is phi 30mm +/-0.5 mm; heating a zirconium alloy bar blank to 950 ℃, perforating the zirconium alloy bar blank by using a two-roller inclined rolling mill set, using a water-cooling top, controlling the total diameter reduction rate to be 10%, controlling the pre-top reduction rate to be 4.5%, controlling the ovality coefficient to be 1.15, controlling the perforation speed to be 0.5mm/s, and perforating to obtain the zirconium alloy pierced billet. Peeling the outer surface of the zirconium alloy pierced billet and boring the inner surface of the zirconium alloy pierced billet to obtain a pierced billet with a smooth surface, the size of phi 105mm, the wall thickness of 9mm and the length of 4500 mm; then, an LG120 rolling mill is adopted for rolling, the rolling speed is 60 times/min, the feeding amount is 5 mm/time, and the rolling size is as follows: 
And (5) degreasing the rolled pipe. Annealing at 650 deg.C for 210min under vacuum pressure of less than 1 × 10-2Pa; the rolling is carried out by adopting an LG120 rolling mill, the rolling speed is 60 times/min, the feeding amount is 4 m/time, and the rolling size is as follows:
and (5) degreasing the rolled pipe. Annealing at 650 deg.C for 210min under vacuum pressure of less than 1 × 10-2Pa; straightening the pipe on six-roller straightening equipment, wherein the straightness is less than 2.1 mm/m; the acid solution is prepared by nitric acid, hydrofluoric acid and water, and the removal amount of the wall thickness of the acid washing is 0.1 mm;
water pressure test: the water pressure is 17.2 MPa, the time is kept for 5 seconds, and no leakage exists in the water pressure test of the pipe; gas chemical composition test: the content of hydrogen element is 0.002%, and the content of nitrogen element is 0.013; testing room temperature tensile property: maximum tensile strength 620 MPa, yield strength 519 MPa, elongation 21%; and (3) detecting the size of the pipe:
the invention aims to protect a zirconium alloy pipe preparation method and a zirconium alloy pipe prepared based on the method, and the preparation method comprises the following steps: performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank; heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet; carrying out second treatment on the pierced billet to prepare a pipe; straightening the pipe to obtain a semi-finished zirconium alloy pipe; and (4) carrying out acid pickling on the semi-finished zirconium alloy pipe to obtain the finished zirconium alloy pipe. The method overcomes the defects of long working procedure, low production rate, low yield, large consumption and difficulty in meeting the requirement of large-scale process production in the prior art, and provides the method for manufacturing the zirconium alloy seamless tube, which has the advantages of short production period, high production efficiency and high success rate, can greatly reduce the production cost and can meet the requirement of large-scale industrial production.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (12)
1. A preparation method of a zirconium alloy pipe is characterized by comprising the following steps:
performing first treatment on a zirconium alloy zirconium ingot to prepare a bar blank;
heating the bar blank to a first temperature, and perforating the bar blank to obtain a pierced billet;
carrying out second treatment on the pierced billet to prepare a pipe;
straightening the pipe to obtain a semi-finished zirconium alloy pipe;
and carrying out acid washing on the semi-finished zirconium alloy pipe to obtain a finished zirconium alloy pipe.
2. The method of manufacturing a zirconium alloy pipe as recited in claim 1, wherein the first treatment comprises:
hot forging the zirconium alloy zirconium ingot into a rough bar blank;
and cutting, polishing and centering the rough bar blank to obtain the bar blank.
3. The method for preparing the zirconium alloy pipe as recited in claim 2, wherein the diameter of the bar billet is 50mm to 130 mm.
4. The method for preparing the zirconium alloy pipe as claimed in claim 2, wherein the length of the bar billet is 650mm to 4500 mm.
5. The method for preparing the zirconium alloy pipe as recited in claim 2, wherein the range of the centering hole of the bar blank is phi 18 ± 0.5mm to phi 30 ± 0.5 mm.
6. The method of manufacturing a zirconium alloy pipe as recited in claim 1, wherein the first temperature is in a range of 700 ℃ to 980 ℃.
7. The method for preparing the zirconium alloy pipe as recited in claim 1, wherein the piercing step is performed by using a rolling mill set, the rolling mill set uses a water-cooled plug, and the piercing speed of the bar billet by the rolling mill set is 0.2-0.5 mm/s;
the perforation step conditions are as follows: the total diameter reduction rate of the bar billet is 9-16%, the pre-jacking reduction rate is 2.5-11%, and the outer diameter ovality coefficient is 1.13-1.20.
8. The method of manufacturing a zirconium alloy pipe as recited in claim 1, wherein the second treatment comprises:
removing the defects on the inner surface and the outer surface of the pierced billet to obtain a pierced billet with a smooth surface;
And carrying out cold rolling treatment on the pierced billet with the smooth surface for multiple times, and carrying out degreasing and vacuum annealing once after cold rolling is finished.
9. The method for preparing the zirconium alloy pipe as recited in claim 8, wherein the vacuum annealing temperature is 650 ℃ to 750 ℃, the time is 60min to 210min, and the vacuum pressure is less than 1 x 10-2Pa。
10. The method for preparing the zirconium alloy pipe as claimed in claim 1, wherein the semi-finished zirconium alloy pipe has a straightness of less than 2.1 mm/m.
11. The method of manufacturing a zirconium alloy pipe according to claim 1, wherein the pickling wall thickness removal amount is 0.05mm to 0.30 mm.
12. A zirconium alloy pipe, characterized by being produced by the method for producing a zirconium alloy pipe according to any one of claims 1 to 11.
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