CN108467969B - High-corrosion-resistance titanium alloy pipe for oil and gas development and preparation method thereof - Google Patents
High-corrosion-resistance titanium alloy pipe for oil and gas development and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a high corrosion resistant titanium alloy pipe for oil gas development and a preparation method thereof, and mainly solves the problems of insufficient corrosion resistance, high cost, complex processing, large difference in performance and the like of the conventional titanium alloy pipe in a high corrosion environment. The titanium alloy pipe is mainly composed of the following components in percentage by mass except Ti: 3.6-4.1%, V: 2.1-2.6%, Fe: 0.7-1.6%, O: 0.15-0.26%, Ru: 0.01 to 1.1%, Ni: 0.05-1.5%, more than 0 and less than or equal to 0.07% of C, more than 0 and less than or equal to 0.05% of N, and more than 0 and less than or equal to 0.0155% of H. Meanwhile, the invention also provides a method for preparing the titanium alloy pipe. The titanium alloy tube material adopts reasonable alloy component design, reduces the using amount of noble metals such as Ru and V in the original components, supplements beta-phase stable elements by using reasonable proportion of Fe element and O element, improves the alloy strength and toughness, and keeps the compactness and stability of a surface oxidation film by utilizing the synergistic action of Ru, V, Fe, Ni, W, Mo and other elements to improve the corrosion resistance.
Description
Technical Field
The invention relates to the field of pipes for oil and gas development in the petroleum and natural gas industry, in particular to a high-corrosion-resistance titanium alloy pipe for oil and gas development and a preparation method thereof, so as to ensure safe and effective exploitation of oil and gas wells.
Background
With the further development of petroleum and natural gas, many western and southwest oil and gas field developments in China have high temperature (more than 140 ℃), high pressure (more than 100MPa), well depth (more than 5000m), and high corrosion medium (CO)2、H2S、CL－) In order to meet the requirements of oil and gas field development on corrosion resistance of oil casings, titanium alloy materials have been used for manufacturing oil casings and have very excellent performance in consideration of their excellent properties such as high strength, excellent corrosion resistance, low elastic modulus, easy cold forming, and seawater scouring resistance.
As the development conditions of oil and gas in China are greatly different from those of other countries, the total pressure and CO of a plurality of oil and gas fields2Partial pressure and H2The corrosion conditions such as S partial pressure and the like far exceed foreign countries, so that not all titanium alloy materials are suitable for the severe oil and gas development working conditions in China, the use of the titanium alloy materials in the petroleum development industry is restricted due to the serious corrosion problems (such as stress corrosion cracking, gap corrosion and the like) of the conventional titanium alloys such as TA18, TC4 and the like under the working conditions, the existing and used corrosion-resistant titanium alloys such as Ti-0.15Pd, Ti-Ru and the like in the world are added with a large amount of noble metals such as palladium, ruthenium and the like, the cost and the processing complexity of the alloys are greatly improved, and meanwhile, the performance has larger difference, therefore, the application and popularization of the titanium alloy are limited, the cost of the alloy is reduced under the condition of keeping certain strength and corrosion resistance, the titanium alloy pipe material with low cost and high corrosion resistance and the preparation and processing technology thereof are developed, and the industrial application of the titanium alloy oil well pipe product in the field of oil and gas exploitation is realized.
Disclosure of Invention
The invention aims to solve the problems of high cost, complex processing, large difference in performance and the like of the existing titanium alloy pipe, and provides a high-corrosion-resistance titanium alloy pipe for oil gas development and a preparation method thereof.
The technical solution of the present invention to solve the above problems is,
a high corrosion resistant titanium alloy pipe for oil gas development is mainly composed of the following components by mass percent except Ti: 3.6-4.1%, V: 2.1-2.6%, Fe: 0.7-1.6%, O: 0.15-0.26%, Ru: 0.01 to 1.1%, Ni: 0.05-1.5%, more than 0 and less than or equal to 0.07% of C, more than 0 and less than or equal to 0.05% of N, and more than 0 and less than or equal to 0.0155% of H.
Further, the high corrosion resistant titanium alloy pipe for oil and gas development comprises the following components in percentage by mass: 4.05%, V: 2.15%, Fe: 0.92%, O: 0.25%, Ru: 0.01%, Ni: 0.97%, C: 0.05%, N: 0.03%, H: 0.0131 percent and the balance of Ti.
Further, the high corrosion resistant titanium alloy pipe for oil and gas development is added with one or more than two alloy elements in the following components in percentage by mass, Cr: 0.1-0.7%, W: 0.02-0.55%, Mo: 0.01 to 0.12 percent. The addition of Mo element in titanium alloy can not only refine crystal grains and improve the strength and plasticity of the alloy, but also add a proper trace amount of Mo element in titanium to ensure that the cooperation of Ru-Mo element can improve the corrosion resistance of the titanium alloy, and the addition of Cr element in titanium can move the FLADE potential (passivation potential) of titanium to an active region, so that the passivation of the titanium alloy can be promoted by cooperating with Ru element, the cooperation of Ru-W element can greatly enhance the corrosion resistance of the titanium alloy, and simultaneously, the addition of less element can reduce the alloy cost.
Further, the high corrosion resistant titanium alloy pipe for oil and gas development comprises the following components in percentage by mass: 3.6%, V: 2.55%, Fe: 1.38%, O: 0.17%, Ru: 1.0%, Ni: 0.12%, C: 0.06%, N: 0.03%, H: 0.0142%, W: 0.35%, Mo: 0.08 percent, and the balance being Ti.
Further, the high corrosion resistant titanium alloy pipe for oil and gas development comprises the following components in percentage by mass: 3.95%, V: 2.45%, Fe: 1.48%, O: 0.21%, Ru: 0.05%, Ni: 1.21%, C: 0.06%, N: 0.04%, H: 0.0149%, Cr: 0.6%, W: 0.35% and the balance Ti.
Meanwhile, the invention also provides a method for preparing the high-corrosion-resistance titanium alloy pipe for oil and gas development, which comprises the following steps:
1) smelting the proportioned titanium alloy components into ingots by a vacuum consumable electrode furnace, turning off a surface oxide layer by using a machining method, heating the ingots to 1050-1150 ℃, and forging the ingots into an intermediate blank state;
2) heating the intermediate blank to 1000-1050 ℃ for homogenizing annealing, and forging the intermediate blank for the second time at 940-1000 ℃ with the reduction of 50-70% to prepare an extruded bar;
3) heating the titanium alloy extruded bar to 870-955 ℃ for hot extrusion, wherein the deformation is 75-90%, preparing an extruded tube blank of the titanium alloy, carrying out acid-base washing, checking the state of the inner surface and the outer surface, and treating surface defects;
4) carrying out vacuum stress relief annealing on the extruded tube blank at the temperature of 600-800 ℃, annealing for 1-2 hours, straightening the tube blank, carrying out acid and alkali cleaning on the straightened tube blank, checking the surface state and removing defects;
5) further processing the tube blank obtained in the step 4) at room temperature by using a cold rolling process, then performing stress relief annealing treatment on the cold-rolled tube to prepare a finished tube, and performing ultrasonic flaw detection and eddy current flaw detection on the annealed tube;
6) and processing API standard threads or special threads at two ends of the qualified titanium alloy pipe by using a numerical control machine tool to complete the preparation and processing of the titanium alloy petroleum pipe.
Further, the straightening of the tube blank in the step 4) is to straighten the tube blank by using a vacuum creep deformation straightening machine.
The invention has the beneficial effects that:
1. the titanium alloy tube material adopts reasonable alloy component design, reduces the using amount of noble metals such as Ru and V in the original components, supplements beta phase stable elements by using a reasonable proportion of Fe element and O element, improves the strength and toughness of the alloy, improves the hydrogen evolution reaction rate of the surface of the titanium alloy by utilizing the synergistic action of the elements such as Ru, V, Fe, Ni, W, Mo and the like, accelerates the formation speed of hydrogen, and ensures that a passive film (titanium oxide) on the surface of the titanium alloy keeps higher stability and integrity in a severe acid environment, thereby improving the corrosion resistance of the alloy, and ensuring that the titanium alloy tube still has higher corrosion resistance while having higher strength and excellent toughness.
2. The titanium alloy pipe has the advantages of less consumption of noble metal elements, lower cost, wider requirements on Fe elements and O elements in the components, capability of smelting and processing sponge titanium with lower grade, capability of remelting and preparing pure titanium or TC4 return materials in the later period, and capability of obviously reducing the cost of the titanium alloy pipe.
3. The high-corrosion-resistance low-cost titanium alloy petroleum pipe for oil and gas development, prepared by the preparation method, has the structures of a primary alpha phase and a secondary beta phase, is uniform in components, fine in crystal grains and free of obvious segregation, and the whole titanium alloy pipe has excellent mechanical properties, the yield strength is more than or equal to 758MPa, the tensile strength is more than or equal to 860MPa, the elongation is more than or equal to 20%, and the full-size Charpy V-shaped impact energy is more than or equal to 50J.
4. The titanium alloy petroleum pipe prepared by the method has the annual uniform corrosion rate of less than or equal to 0.25mm/y in the typical environment of oil and gas fields in southwest China, has excellent corrosion resistance and mechanical properties, is low in cost and convenient to prepare and process, and can meet the requirements of low-cost and high-corrosion resistance titanium alloy petroleum pipes under severe oil and gas development conditions in China.
Drawings
FIG. 1 is a metallographic structure diagram of a titanium alloy tube prepared according to the first embodiment of the present invention;
FIG. 2 is a metallographic structure diagram of a titanium alloy tube prepared according to example two of the present invention;
FIG. 3 is a metallographic structure diagram of a titanium alloy tube prepared according to a third embodiment of the present invention;
FIG. 4 is a lattice diffraction pattern diagram of a Ti-Ru-Fe compound.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples:
the invention relates to a high corrosion resistant titanium alloy pipe for oil gas development, which mainly comprises the following components in percentage by mass except Ti: 3.6-4.1%, V: 2.1-2.6%, Fe: 0.7-1.6%, O: 0.15-0.26%, Ru: 0.01 to 1.1%, Ni: 0.05-1.5%, more than 0 and less than or equal to 0.07% of C, more than 0 and less than or equal to 0.05% of N, more than 0 and less than or equal to 0.0155% of H; on the basis, the alloy can also be added with Cr in percentage by mass: 0.1-0.7%, W: 0.02-0.55%, Mo: 0.01-0.12% of one or more than two alloy elements.
Mo element is a isomorphous beta-phase stable element, Mo can be infinitely dissolved in the beta phase, the addition of Mo element in the titanium alloy can not only refine crystal grains and improve the strength and the plasticity of the alloy, but also add a proper trace amount of Mo element in the titanium so that the cooperation effect of Ru-Mo element can improve the corrosion resistance of the titanium alloy, but when Mo element is added to a certain amount, the continuous addition can bring about the reduction of the corrosion resistance.
Cr element can form an infinite solid solution with beta phase in titanium alloy and stabilize the beta phase, when 667 ℃ is high, 05% wt. of Cr element can generate eutectoid reaction with titanium to generate alpha phase and TiCr2 phase, the addition of Cr element in titanium can move FLADE potential (passivation potential) of titanium to an active region, and the passivation of titanium alloy can be promoted by matching with Ru element.
W element is also a eutectoid beta-phase stabilizing element, and W and Cr form a continuous solid solution with the beta phase similarly. The corrosion resistance of titanium in hydrochloric acid and sulfuric acid can be improved by adding the W element into the titanium, and particularly, when the W element is matched with palladium group metal for use, the corrosion resistance can be greatly improved through interaction; however, in reducing acid, the corrosion resistance of titanium is reduced by adding only W element, but the corrosion resistance of titanium alloy is greatly enhanced by adding Ru-W element, and the alloy cost is reduced by adding less element.
The invention provides a preparation and processing method of a titanium alloy pipe, which comprises the following steps:
1) smelting the proportioned titanium alloy components into ingots through a vacuum consumable electrode furnace, turning off a surface oxide layer by using a machining method, heating the ingots to 1050-1150 ℃, and forging the ingots to an intermediate blank state;
2) then heating the intermediate blank to over 1000-1050 ℃ for homogenizing annealing to improve segregation and make the structure more uniform, and then forging the intermediate blank for the second time at 940-1000 ℃ with the reduction of 50-70% to prepare an extruded bar;
3) heating the titanium alloy extruded bar to 870-955 ℃ for hot extrusion, wherein the deformation is 75-90%, after preparing the extruded tube blank of the titanium alloy, carrying out acid-base washing and checking the state of the inner surface and the outer surface, and processing surface defects;
4) then carrying out vacuum stress relief annealing on the extruded tube blank at the temperature of 600-800 ℃, annealing for 1-2 hours, straightening the tube blank by using a vacuum creep deformation straightening machine, carrying out acid and alkali cleaning on the straightened tube blank, checking the surface state and removing defects;
5) further processing the pipe blank in the state of the step 4) to the required size and precision of the petroleum pipe by using a cold rolling process at room temperature, then carrying out stress relief annealing treatment on the cold-rolled pipe to prepare a finished pipe, and carrying out ultrasonic flaw detection and eddy current flaw detection on the annealed pipe;
6) and processing API standard threads or special threads at two ends of each qualified titanium alloy by using a numerical control machine tool, and thus finishing the preparation and processing of the titanium alloy petroleum pipe.
Example one
The high-corrosion-resistance low-cost titanium alloy petroleum pipe for oil and gas development comprises the following components in percentage by mass: 4.05%, V: 2.15%, Fe: 0.92%, O: 0.25%, Ru: 0.01%, Ni: 0.97%, C: 0.05%, N: 0.03%, H: 0.0131 percent; ti: 91.5569 percent.
The preparation and processing method of the titanium alloy pipe comprises the following steps:
smelting the proportioned titanium alloy components into ingots through a vacuum consumable furnace, removing surface loose layers by using a lathe, heating the ingots to 1080-1100 ℃, forging the ingots to an intermediate blank state, heating the intermediate blank to 1020 ℃, carrying out homogenization annealing to improve segregation, enabling the structure to be more uniform, carrying out secondary forging on the intermediate blank at 940-960 ℃, and preparing extruded bars with the reduction of 70%;
heating the titanium alloy extruded bar to 870-900 ℃ for hot extrusion, wherein the deformation is 85%, preparing an extruded tube blank of the titanium alloy, carrying out acid-alkali washing to inspect the inner and outer surface states, removing surface defects, carrying out vacuum stress relief annealing on the extruded tube blank at 650-700 ℃, annealing for 1 hour, straightening the tube blank by using a vacuum creep deformation shape correcting machine, carrying out acid-alkali washing on the straightened tube blank, inspecting the surface state and removing the defects;
and (3) further processing the extruded and straightened tube blank into an oil pipe with the outer diameter of 88.9mm and the wall thickness of 7.03mm by using a cold rolling process at room temperature, then performing stress relief annealing treatment on the cold-rolled pipe to prepare a finished pipe, performing ultrasonic flaw detection and eddy current flaw detection on the annealed pipe, and processing API standard threads at two ends of each qualified titanium alloy by using a numerical control machine tool to complete the preparation and processing of the titanium alloy oil pipe with the specification.
As shown in figure 1, the titanium alloy petroleum pipe prepared by the components and the process is subjected to performance test, the pipe structure is a primary alpha phase and a regenerative beta phase, the components are uniform and have no obvious segregation, the grain size is 5-15 mu m, the yield strength is 798MPa, the tensile strength is 895MPa, the transverse elongation is 24%, the full-size Charpy V-shaped impact energy is 51J, and no crack is generated in a flattening test and a flaring test.
The titanium alloy petroleum pipe prepared by the invention is sampled, the titanium alloy petroleum pipe is prepared into a sample, a high-temperature high-pressure corrosion test is carried out under the environmental conditions shown in the following table 1, the dynamic rotating speed is 300 r/min, the test time is 96 hours, the average annual corrosion rate is calculated according to the standard NACE RP0775-2005 after the test, and the result shows that the titanium alloy material has excellent corrosion resistance.
Table 1 example a corrosion test conditions and test results
| Test environment medium | Corrosion rate, mm/y | Test time, day |
| 25% nitric acid environment at 98 DEG C | 3 | 7 |
| 100% acetic acid | 0 | 7 |
| 50% formic acid | 5 | 1 |
| 5% HCl at 75 deg.C | 0.57 | 1 |
| 10% HCl at 75 deg.C | 6.9 | 1 |
| 10% HCl + 0.1% FeCl3 at 101 deg.C | 3.5 | 7 |
| 21 ℃ seawater and crevice corrosion sample | 0 | 21 |
| 160℃+9MPa H2S+6MPaCO2+150000mg/L of Cl- | 0.021 | 6 |
Example two
The high-corrosion-resistance low-cost titanium alloy petroleum pipe for oil and gas development comprises the following components in percentage by mass: 3.95%, V: 2.45%, Fe: 1.48%, O: 0.21%, Ru: 0.05%, Ni: 1.21%, C: 0.06%, N: 0.04%, H: 0.0149%, Cr: 0.6%, W: 0.35%, Ti: 89.5851 percent.
The preparation and processing method of the titanium alloy pipe comprises the following steps:
smelting the proportioned titanium alloy components into an ingot through a vacuum consumable furnace, removing a surface loose layer by using a lathe, heating the ingot to 1100-1130 ℃ to forge the ingot to an intermediate blank state, heating the intermediate blank to 1050 ℃ to perform homogenization annealing to improve segregation so as to enable the structure to be more uniform, then performing secondary forging on the intermediate blank at 960-1000 ℃, wherein the reduction is 60%, and preparing an extruded bar;
heating the titanium alloy extruded bar to 930-955 ℃ for hot extrusion, wherein the deformation is 90%, preparing an extruded tube blank of the titanium alloy, carrying out acid-alkali washing, checking the inner and outer surface states, removing surface defects, carrying out vacuum stress relief annealing on the extruded tube blank at 730-750 ℃, annealing for 1.5 hours, straightening the tube blank by using a vacuum creep deformation shape correcting machine, carrying out acid-alkali washing on the straightened tube blank, checking the surface state and removing the defects;
and (3) further processing the extruded and straightened tube blank into an oil pipe with the outer diameter of 88.9mm and the wall thickness of 7.03mm by using a cold rolling process at room temperature, then performing stress relief annealing treatment on the cold-rolled pipe to prepare a finished pipe, performing ultrasonic flaw detection and eddy current flaw detection on the annealed pipe, and processing API standard threads at two ends of each qualified titanium alloy by using a numerical control machine tool to complete the preparation and processing of the titanium alloy oil pipe with the specification.
As shown in figure 2, the titanium alloy petroleum pipe prepared by the components and the process is subjected to performance test, the pipe structure is a primary alpha phase and a regenerative beta phase, the components are uniform and have no obvious segregation, the grain size is 10-15 mu m, the yield strength is 825MPa, the tensile strength is 920MPa, the transverse elongation is 20%, the full-size Charpy V-shaped impact energy is 52J, and no crack is generated in a flattening test and a flaring test.
The titanium alloy petroleum pipe prepared by the invention is sampled, the titanium alloy petroleum pipe is prepared into a sample, a high-temperature high-pressure corrosion test is carried out under the environmental conditions shown in the following table 1, the dynamic rotating speed is 300 r/min, the test time is 96 hours, the average annual corrosion rate is calculated according to the standard NACE RP0775-2005 after the test, and the result shows that the titanium alloy material has excellent corrosion resistance.
Table 2 example two corrosion test conditions and test results
EXAMPLE III
The high-corrosion-resistance low-cost titanium alloy petroleum pipe for oil and gas development comprises the following components in percentage by mass: al: 3.6%, V: 2.55%, Fe: 1.38%, O: 0.17%, Ru: 1.0%, Ni: 0.12%, C: 0.06%, N: 0.03%, H: 0.0142%, W: 0.35%, Mo: 0.08%, Ti: 90.6458 percent.
The preparation and processing method of the titanium alloy pipe comprises the following steps:
smelting the proportioned titanium alloy components into an ingot through a vacuum consumable furnace, removing a surface loose layer by using a lathe, heating the ingot to 1100-1150 ℃, forging to an intermediate blank state, heating the intermediate blank to 1050 ℃, carrying out homogenization annealing to improve segregation, enabling the structure to be more uniform, carrying out secondary forging on the intermediate blank at 980-1000 ℃, and making the reduction amount be 55% to prepare an extruded bar material;
heating the titanium alloy extruded bar to 920-940 ℃ for hot extrusion, wherein the deformation is 80%, preparing an extruded tube blank of the titanium alloy, carrying out acid-alkali washing, checking the inner and outer surface states, removing surface defects, carrying out vacuum stress relief annealing on the extruded tube blank at 760-800 ℃, annealing for 2 hours, straightening the tube blank by using a vacuum creep deformation shape correcting machine, carrying out acid-alkali washing on the straightened tube blank, checking the surface state and removing the defects;
and (3) further processing the extruded and straightened tube blank to an oil pipe with the outer diameter of 73.02mm and the wall thickness of 6.45mm by using a cold rolling process at room temperature, then carrying out stress relief annealing treatment on the cold-rolled pipe to prepare a finished pipe, carrying out ultrasonic flaw detection and eddy current flaw detection on the annealed pipe, and processing airtight threads at two ends of each qualified titanium alloy by using a numerical control machine tool to complete the preparation and processing of the titanium alloy oil pipe with the specification.
The titanium alloy petroleum pipe prepared by the components and the process is subjected to performance test, the pipe structure is a primary alpha phase, a regenerated beta phase and a little Ti-Ru-Fe compound, the components are uniform and have no obvious segregation, the grain size is 3-15 mu m, the reason that the grain is fine is that Ru has the effect of refining the grain, as shown in figure 2, the lattice diffraction pattern of the Ti-Ru-Fe compound is as shown in figure 3, the Ti-Ru-Fe compound is of a body-centered cubic structure, the yield strength of the pipe is 827MPa, the tensile strength is 955MPa, the transverse elongation is 22%, the full-size Charpy V-shaped impact energy is 53J, and no crack is generated in a flattening test and a flaring test.
The titanium alloy petroleum pipe prepared by the invention is sampled, the titanium alloy pipe is prepared into a sample, a high-temperature high-pressure corrosion test is carried out under the environmental conditions shown in the following table 2, the dynamic rotating speed is 300 r/min, the test time is 96 hours, the average annual corrosion rate is calculated according to the standard NACE RP0775-2005 after the test, and the result shows that the titanium alloy material has excellent corrosion resistance.
TABLE 3 EXAMPLE three Corrosion test conditions and test results
| Test environment medium | Corrosion rate, mm/y | Test time, day |
| 25% nitric acid environment at 98 DEG C | 2.1 | 7 |
| 100% acetic acid | 0 | 7 |
| 50% formic acid | 3.61 | 1 |
| 5% HCl at 75 deg.C | 0.38 | 1 |
| 10% HCl at 75 deg.C | 5.7 | 1 |
| 10% HCl + 0.1% FeCl3 at 101 deg.C | 2.57 | 7 |
| 21 ℃ seawater and crevice corrosion sample | 0 | 21 |
| 160℃+9MPa H2S+6MPaCO2+150000mg/L of Cl- | 0.009 | 6 |
Claims (4)
1. A high corrosion resistant titanium alloy pipe for oil gas development is characterized in that: the alloy consists of the following components in percentage by mass: 3.6%, V: 2.55%, Fe: 1.38%, O: 0.17%, Ru: 1.0%, Ni: 0.12%, C: 0.06%, N: 0.03%, H: 0.0142%, W: 0.35%, Mo: 0.08 percent, and the balance being Ti.
2. A high corrosion resistant titanium alloy pipe for oil gas development is characterized in that: the alloy consists of the following components in percentage by mass: 3.95%, V: 2.45%, Fe: 1.48%, O: 0.21%, Ru: 0.05%, Ni: 1.21%, C: 0.06%, N: 0.04%, H: 0.0149%, Cr: 0.6%, W: 0.35% and the balance Ti.
3. A method for preparing the high corrosion resistant titanium alloy pipe for oil and gas development of any one of claims 1 to 2, comprising the steps of:
1) smelting the proportioned titanium alloy components into ingots by a vacuum consumable electrode furnace, turning off a surface oxide layer by using a machining method, heating the ingots to 1050-1150 ℃, and forging the ingots into an intermediate blank state;
2) heating the intermediate blank to 1000-1050 ℃ for homogenizing annealing, and forging the intermediate blank for the second time at 940-1000 ℃ with the reduction of 50-70% to prepare an extruded bar;
3) heating the titanium alloy extruded bar to 870-955 ℃ for hot extrusion, wherein the deformation is 75-90%, preparing an extruded tube blank of the titanium alloy, carrying out acid-base washing, checking the state of the inner surface and the outer surface, and treating surface defects;
4) carrying out vacuum stress relief annealing on the extruded tube blank at the temperature of 600-800 ℃, annealing for 1-2 hours, straightening the tube blank, carrying out acid and alkali cleaning on the straightened tube blank, checking the surface state and removing defects;
5) further processing the tube blank obtained in the step 4) at room temperature by using a cold rolling process, then performing stress relief annealing treatment on the cold-rolled tube to prepare a finished tube, and performing ultrasonic flaw detection and eddy current flaw detection on the annealed tube;
6) and processing API standard threads or special threads at two ends of the qualified titanium alloy pipe by using a numerical control machine tool to complete the preparation and processing of the titanium alloy pipe.
4. The method of making a highly corrosion resistant titanium alloy tube for oil and gas development of claim 3, wherein: and 4) straightening the tube blank in the step 4) by using a vacuum creep deformation shaper.
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