Iron-nickel-based corrosion-resistant injection-production pipe and manufacturing method thereof

Abstract

The invention discloses an iron-nickel-based corrosion-resistant injection-production pipe which contains Fe and inevitable impurity elements and is characterized by further comprising the following chemical elements in percentage by mass: 0 < C < = 0.03%, 0 < Si < = 0.5%, 0 < Mn < = 1.0%, 25-35% of Cr, 30-40% of Ni, 3-5% of Mo, 0.1-1.0% of Al, 0.1-1.0% of Cu and 0.01-0.1% of Nb. Correspondingly, the invention further discloses a manufacturing method of the iron-nickel-based corrosion-resistant injection-production pipe, and the manufacturing method comprises the following steps: smelting and casting to obtain an ingot blank; forging the ingot blank into a pipe blank; heating the pipe blank; performing hot extrusion; carrying out solution treatment; aging treatment; and cold rolling. The iron-nickel-based corrosion-resistant injection-production pipe has the performance of high-salt high-pressure oxygen environment corrosion resistance.

Description

Technical Field

[0001] The invention relates to a pipe material and a manufacturing method thereof, and in particular to an injection-production pipe and a manufacturing method thereof. Background Art

[0002] Underground compressed air energy storage conditions are characterized by high oxygen, high water and high salt content. As the transmission channel between the storage cave and the ground, the injection and production pipes face severe oxygen corrosion and chloride ion erosion. The commonly used carbon steel injection and production pipes have a uniform corrosion rate of up to 2 to 10 mm / a due to oxygen corrosion in underground compressed air energy storage conditions, which is dozens or even hundreds of times the corrosion rate of common acidic corrosion such as CO2 and H2S; stainless steel injection and production pipes are prone to extremely severe local corrosion due to chloride ion erosion. For example, the widely used 13Cr, 304, and 2507 stainless steels have pitting rates of up to 62 mm / a, 42 mm / a, and 5 mm / a, respectively, in underground compressed air energy storage conditions.

[0003] Based on this, the nickel-based alloy injection and production pipes currently under research are designed to meet the corrosion protection requirements for pipes used in underground compressed air energy storage conditions.

[0004] For example, a Chinese patent document with publication number CN101613834A, publication date December 30, 2009, and titled “Fe-based austenitic alloy oil casing and manufacturing method for high-acid deep wells” discloses a method for manufacturing an iron-based austenitic alloy, wherein the chemical element composition (hereinafter, unless otherwise specified, all element compositions are mass components) is: C≤0.03%, P≤0.03%, S≤0.03%, Si 0.01-1.0%, Mn0.01-3.0%, Ni 25-40%, Cr 20-35%, Mo 1-5%, Cu 0.1-1.5%, Al 0.01-0.5%, O≤0.01%, and the remainder is iron and unavoidable impurities, and then hot extrusion and cold rolling are performed to obtain 90-140 ksi steel grade oil casing. This patent does not specify the Ni equivalent and Cr equivalent, which may lead to the production of more delta ferrite in the austenitic alloy, thereby destroying the overall corrosion resistance of the alloy and increasing the tendency of the alloy to crack during processing.

[0005] Another example: The Chinese patent document with the publication number CN114472524A and the publication date of May 13, 2022, entitled "A method for preparing an iron-nickel-based alloy oil well pipe", discloses a method for manufacturing an iron-nickel-based alloy oil well pipe, the chemical element composition of which is: C≤0.05%, Si≤0.5%, Mn≤1%, P≤0.03%, S≤0.03%, Al≤0.2%, Ti 0.6-1.2%, Cu 1.5-3%, Mo 2.5-3.5%, Cr 19.5-23.5%, Ni 38-46%, and the balance is iron and unavoidable impurities, and then hot extrusion and cold rolling are used to obtain an oil well pipe with a yield strength of more than 760MPa. The patent adopts a design with a lower Cr content, which is mainly used for acidic oil and gas wells with low oxygen content, and is prone to pitting in underground compressed air energy storage conditions with high oxygen and salt content. Summary of the invention

[0006] One of the purposes of the present invention is to provide an iron-nickel based corrosion resistant injection and production pipe, which has the performance of being resistant to corrosion in a high-salt, high-pressure oxygen environment.

[0007] In order to achieve the above object, the present invention provides an iron-nickel-based corrosion-resistant injection and production pipe, which contains Fe and inevitable impurity elements, and further contains the following chemical elements in the following mass percentages:

[0008] 0<C≤0.03%, 0<Si≤0.5%, 0<Mn≤1.0%, Cr: 25~35%, Ni: 30~40%, Mo: 3~5%, Al: 0.1~1.0%, Cu: 0.1~1.0%, Nb: 0.01~0.1%.

[0009] Accordingly, the present invention also provides an iron-nickel-based corrosion-resistant injection and production pipe, the mass percentage of each chemical element of which is:

[0010] 0<C≤0.03%, 0<Si≤0.5%, 0<Mn≤1.0%, Cr: 25~35%, Ni: 30~40%, Mo: 3~5%, Al: 0.1~1.0%, Cu: 0.1~1.0%, Nb: 0.01~0.1%; the balance is Fe and unavoidable impurity elements.

[0011] Furthermore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the mass percentage of each chemical element satisfies at least one of the following items:

[0012] 0<C≤0.02%;

[0013] 0<Si≤0.2%;

[0014] 0<Mn≤0.5%;

[0015] Cr: 28-33%;

[0016] Ni: 33-38%;

[0017] Al: 0.4-0.7%;

[0018] Cu: 0.3-0.8%;

[0019] Nb: 0.05~0.08%.

[0020] In the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the design principles of each chemical element are specifically described as follows:

[0021] C: In the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, C is a strong solid solution strengthening element that can improve the strength of austenitic alloys. However, too high a C content will lead to a large amount of M 23 Precipitated phases such as C6, especially at the grain boundaries, are prone to produce chromium-depleted areas, thereby reducing the corrosion resistance of the alloy, especially the intergranular corrosion resistance. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the C element content is controlled to be below 0.03%, and in some embodiments, the C element content can be further controlled to be below 0.02%.

[0022] Si: In the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, Si is an effective deoxidizer, and Si is also a strong ferrite-forming element. In austenitic alloys, as the Si content increases, the δ ferrite content increases accordingly. However, too high Si content will accelerate the formation and increase of the intermetallic compound σ phase in the alloy, resulting in increased material brittleness, deterioration of the comprehensive mechanical properties, and decreased corrosion resistance. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the Si content is controlled below 0.5%, and in some embodiments, the Si content can be further controlled below 0.2%.

[0023] Mn: In the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, Mn is an effective deoxidizing and desulfurizing agent, but too much Mn will also lead to an increase in the intermetallic compound σ phase and carbides in the alloy, thereby deteriorating the comprehensive mechanical properties and corrosion resistance of the alloy. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the content of Mn element is controlled to be less than 1.0%, and in some embodiments, the content of Mn element can be further controlled to be less than 0.5%.

[0024] Cr: In the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, Cr is the main element that provides corrosion resistance in the alloy. When the Cr content in the alloy is high, a continuous, dense, Cr-rich oxide film with excellent protective performance will be formed on the surface of the alloy. As the Cr content increases, the Cr / Fe ratio in the oxide film increases, and the stability and protective performance of the oxide film become better. However, too much Cr in the alloy will cause a large amount of σ phase to precipitate, reducing the toughness and plasticity of the material. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the Cr content is controlled at 25-35%, and in some embodiments, the Cr content can be further controlled at 28-33%.

[0025] Ni: In the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, Ni is an element that stabilizes and expands the austenite phase region in the alloy. As the nickel content in the alloy increases, the Ms point will be lowered, so that the residual ferrite can be completely eliminated, and the tendency of σ phase formation is significantly reduced, so that the material can have excellent toughness, plasticity and hot working properties. In addition, Ni can also increase the solubility of Cr and Mo elements in the austenite matrix and improve the corrosion resistance of the alloy. At the same time, Ni itself also has good corrosion resistance. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the content of Ni element is controlled at 30-40%, and in some embodiments, the content of Ni element can be further controlled at 33-38%.

[0026] Mo: In the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, Mo is an excellent element for resisting local corrosion. The mechanism is that after local corrosion occurs, MoO4 in the solution 2- It will be adsorbed on the exposed metal matrix surface after the oxide film breaks, inhibiting the redissolution of the metal. However, too high Mo content will reduce the hot working performance of the alloy. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the Mo content is controlled to 3-5%.

[0027] Al: In the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, Al is an effective deoxidizer, which can effectively reduce the oxide inclusion content in the alloy and improve the mechanical properties of the material. In addition, adding a certain amount of Al element to the alloy can generate a Cr2O3+Al2O3 mixed oxide film on the metal surface, which can significantly improve the material's antioxidant properties in high-temperature water vapor. However, too high an Al content will promote the formation of a ferrite phase, forming an austenite / ferrite dual-phase structure, and reducing the toughness and hot working properties of the alloy. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the Al element content is controlled at 0.1-1.0%, and in some embodiments, the Al element content can be further controlled at 0.4-0.7%.

[0028] Cu: In the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the addition of Cu can significantly reduce the cold work hardening tendency of the austenitic alloy and improve the cold working forming performance. However, the addition amount of the Cu element should not exceed 1.0%, because excessive Cu will greatly reduce the strength of the austenitic alloy. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, the Cu element content is controlled at 0.1-1.0%, and in some embodiments, the Cu element content can be further controlled to 0.3-0.8%.

[0029] Nb: In the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, Nb is a strong carbide-forming element. In the alloy, Nb is easier to combine with C than Cr to form finely dispersed NbC precipitation phases. These precipitation phases can play a role in fine grain strengthening and precipitation strengthening of the alloy, while reducing the Cr in the alloy. 23 The formation of C6 leads to the formation of chromium-depleted areas at the grain boundaries, thereby improving the intergranular corrosion resistance of the alloy. However, too high a Nb content will cause a large amount of NbC to precipitate in the alloy, reducing the toughness and plasticity of the alloy. Therefore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the Nb element content is controlled at 0.01-0.1%, and in some embodiments, the Nb element content can be further controlled at 0.05-0.08%.

[0030] The iron-nickel-based corrosion-resistant injection and production pipe described in the present invention adopts an iron-nickel-based alloy with appropriate amounts of Cr, Ni and other alloy elements. It is an austenitic alloy with excellent corrosion resistance and good forming performance obtained on the basis of the Fe-Ni-Cr system, wherein the pitting corrosion resistance of the alloy is further improved by adding an appropriate amount of Mo element, the stability of the oxide film on the surface of the alloy is improved by adding an appropriate amount of Al element, the cold working forming performance of the alloy is improved by adding an appropriate amount of Cu element, and the strength of the alloy is improved by adding an appropriate amount of Nb element.

[0031] Furthermore, in the iron-nickel-based corrosion-resistant injection and production pipe of the present invention, the mass percentage of each chemical element also satisfies: Ni eq ≥1.15×Cr eq -6.92; of which: Ni eq =Ni+30C+0.5Mn,Cr eq =Cr+Mo+1.5Si+0.5Nb, where each chemical element is substituted into the value before the percentage sign of its mass percentage.

[0032] In this embodiment, the present invention further ensures the stability of austenite of the material by limiting the synergistic relationship of the above elements.

[0033] Furthermore, among the inevitable impurity elements of the iron-nickel based corrosion-resistant injection and production pipe of the present invention: P≤0.03%, S≤0.03%.

[0034] The unavoidable impurities of the present invention are mainly P and S. P and S are both associated harmful impurity elements, which will reduce the thermoplasticity and toughness of the alloy, and have an adverse effect on the hot working performance of the alloy and the toughness and plasticity of the finished pipe. When the content of P and S elements reaches 0.03% or more, the corrosion resistance of the alloy will be seriously damaged. Therefore, in the present invention, the content of P and S elements can be controlled below 0.03%. In some embodiments, the content of P and S elements can be further controlled to P≤0.010% and S≤0.005%.

[0035] Furthermore, the microstructure of the iron-nickel-based corrosion-resistant injection and production pipe of the present invention is uniform 10-20 μm equiaxed austenite, which contains dispersed NbC precipitation phase.

[0036] Furthermore, in the iron-nickel-based corrosion-resistant injection and production pipe described in the present invention, its yield strength is 390-1100 MPa, and the impact energy at 0°C is 89-145 J.

[0037] Furthermore, the pitting rate R of the iron-nickel-based corrosion-resistant injection and production pipe of the present invention in the high-salt and high-oxygen underground compressed air energy storage condition at 30-90°C is piting ≤0.1mm / a, uniform corrosion rate R gen ≤0.01mm / a.

[0038] The pitting corrosion resistance equivalent PRE=Cr+3.3×Mo of the iron-nickel-based corrosion-resistant injection and production pipe of the present invention can reach 51.

[0039] Another object of the present invention is to provide a method for manufacturing an iron-nickel-based corrosion-resistant injection and production pipe. The manufacturing method has a simple process flow and is easy to control. At the same time, with a reasonable chemical component ratio, an iron-nickel-based corrosion-resistant injection and production pipe that is resistant to corrosion in a high-salt, high-pressure oxygen environment can be obtained.

[0040] In order to achieve the above object, the present invention also proposes a method for manufacturing the iron-nickel-based corrosion-resistant injection and production pipe as described above, which comprises the steps of:

[0041] Smelting and casting to obtain ingots;

[0042] Forging the ingot into a tube;

[0043] Heating of tube blank;

[0044] Hot extrusion: hot extrusion is performed on the tube blank to obtain a rough tube, and then the rough tube is immediately water-cooled at a cooling rate of ≥15℃ / s;

[0045] Solution treatment: The solution treatment temperature is 1050-1150℃, and water cooling is performed after the insulation is completed. The cooling rate is ≥15℃ / s;

[0046] Aging treatment: The aging treatment temperature is 850℃~930℃, the aging treatment time is 6~10min / mm, and water cooling is carried out after the insulation is completed, and the cooling rate is ≥10℃ / s;

[0047] Cold rolled.

[0048] In the manufacturing method described in the present invention, the tube blank to be extruded is hot extruded to obtain a rough tube, and then the rough tube is immediately water-cooled at a cooling rate of ≥15°C / s. This is because the grains will undergo large plastic deformation during the extrusion process. If the rough tube continues to maintain a high temperature, recrystallization will occur, causing the grains to become coarse, reducing the cold processing performance of the material. Therefore, water cooling with a cooling rate of ≥15°C / s is used to cool the rough tube.

[0049] After the solution treatment, water cooling is controlled, and the cooling rate is ≥15℃ / s. This is because the precipitation temperature range of Cr carbides is 400℃~800℃. If the rough pipe stays in this temperature range for too long, a large amount of Cr will be 23 Carbides such as C6 precipitate along the grain boundaries, seriously reducing the toughness of the finished pipe. Therefore, water cooling with a cooling rate of ≥15℃ / s is used to quickly cool the rough pipe.

[0050] The aging treatment temperature is controlled to be 850℃~930℃, and the aging treatment time is 6~10min / mm, because the precipitation temperature range of NbC is 850℃~930℃, and high temperature and short time precipitation can increase the nucleation rate of the precipitate phase, while inhibiting the growth of the precipitate phase, improving the dispersion of the precipitate phase and reducing the size of the precipitate phase.

[0051] Furthermore, in the tube blank heating step of the manufacturing method described in the present invention, the tube blank is heated to an extrusion temperature of 1100-1250°C.

[0052] Furthermore, in the hot extrusion step of the manufacturing method described in the present invention, the cooling rate of the raw pipe by water cooling is 20-25° C. / s.

[0053] Furthermore, in the solution treatment step of the manufacturing method of the present invention, the cooling rate of water cooling after the heat preservation is 20-25°C / s.

[0054] Furthermore, in the aging treatment step of the manufacturing method described in the present invention, the aging treatment temperature is 900° C. to 930° C., and the aging treatment time is 6 to 8 min / mm.

[0055] Furthermore, in the cold rolling step of the manufacturing method of the present invention, the cross-section reduction deformation is 20 to 50%.

[0056] The iron-nickel-based corrosion-resistant injection and production pipe and the manufacturing method thereof of the present invention have the following advantages and beneficial effects:

[0057] The iron-nickel-based corrosion-resistant injection and production pipe of the present invention adds a proper amount of Mo element to further improve the pitting corrosion resistance of the alloy, adds a proper amount of Al element to improve the stability of the oxide film on the surface of the alloy, adds a proper amount of Cu element to improve the cold working forming performance of the alloy, and adds a proper amount of Nb element to improve the strength of the alloy.

[0058] The iron-nickel-based corrosion-resistant injection and production pipe of the present invention uses water cooling with a specific cooling rate to cool the rough pipe during the manufacturing process to prevent recrystallization from causing the grains to become coarse and reducing the mechanical properties of the finished pipe.

[0059] The iron-nickel-based corrosion-resistant injection and production pipe of the present invention is rapidly cooled by water cooling at a specific cooling rate after solution treatment, which can prevent a large amount of Cr 23 Carbides such as C6 precipitate along the grain boundaries to improve the toughness of the finished tube.

[0060] The iron-nickel-based corrosion-resistant injection and production pipe of the present invention has excellent corrosion resistance to high-salt and high-pressure oxygen environments. In some embodiments, the pitting rate R in a high-salt and high-oxygen underground compressed air energy storage condition at 30 to 90°C is piting ≤0.1mm / a, uniform corrosion rate R gen ≤0.01mm / a. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 The metallographic image of Example 9 of the present invention is shown. DETAILED DESCRIPTION

[0062] The iron-nickel-based corrosion-resistant injection and production pipe and the manufacturing method thereof described in the present invention will be further explained and illustrated below in conjunction with specific embodiments and the accompanying drawings of the specification. However, such explanation and illustration do not constitute an improper limitation on the technical solution of the present invention.

[0063] The iron-nickel-based corrosion-resistant injection and production pipes of Examples 1-12 and the comparative injection and production pipes of Comparative Examples 1-12 are both seamless pipes with a specification of φ273.05×10.16 mm, which are prepared by the following steps:

[0064] (1) Casting an alloy having a composition ratio as shown in Table 1 into an ingot having a diameter of 500 mm;

[0065] (2) Forging the ingot at 1150°C into a tube with a diameter of 200 mm;

[0066] (3) grinding the surface of the tube blank and drilling the center hole to obtain the tube blank to be extruded;

[0067] (4) heating the tube blank to be extruded to an extrusion temperature of 1100 to 1250° C. and keeping the temperature. The holding time of the tube blank to be extruded may be 1 to 3 min / mm;

[0068] (5) Apply glass lubricating powder on the surface of the tube blank to be extruded after heat preservation, and preheat the hot extrusion die, cylinder and rod to 500-600°C and apply glass lubricating powder;

[0069] (6) Extruding the tube blank through an extrusion die to obtain a rough tube, the extrusion ratio can be 1 to 15, for example, the extrusion ratio is 9.0, the extrusion speed can be 20 to 150 mm / s, and the rough tube is immediately water-cooled after the extrusion is completed, and the cooling rate is not less than 15°C / s;

[0070] (7) The cooled rough pipe is heated to 1050-1150°C for solution treatment. The holding time can be 1-3 min / mm. After the holding time is completed, it is water-cooled with a cooling rate of not less than 15°C / s;

[0071] (8) The rough pipe is aged and precipitated at 850℃~930℃, the aging time is 6~10min / mm, and water-cooled after the insulation, with the cooling rate not less than 10℃ / s;

[0072] (9) The rough pipe is cold rolled, and the cross-section is reduced by 20-50% to obtain a finished product.

[0073] Table 1 lists the mass percentages of chemical elements of the iron-nickel based corrosion resistant injection and production pipes of Examples 1-12 and the comparative injection and production pipes of Comparative Examples 1-12.

[0074] Table 1. (wt%, the balance is Fe and other inevitable impurities except P and S)

[0075]

[0076]

[0077] Table 2 lists the specific process parameters of the iron-nickel-based corrosion-resistant injection and production pipes of Examples 1-12 and the comparative injection and production pipes of Comparative Examples 1-12 in the above process steps.

[0078] Table 2

[0079]

[0080]

[0081] In order to verify the implementation effects of the embodiments of the present invention, samples of the iron-nickel-based corrosion-resistant injection and production pipes of embodiments 1-12 and the comparative injection and production pipes of comparative examples 1-12 were taken to conduct mechanical property tests, and the test results are listed in Table 3. Among them:

[0082] The yield strength data is obtained by processing the manufactured injection and production pipe into API SPEC 5CT arc specimens and taking the average value after testing according to API standards;

[0083] The full-size Charpy V-type impact energy absorption data is obtained by taking full-size V-type impact specimens with a cross-sectional area of ​​10*10*55 from the manufactured steel pipe and taking the average value after testing according to GB / T 229 standard;

[0084] The corrosion test was carried out in a dynamic high-temperature autoclave. A 50mm×20mm×3mm corrosion evaluation sample with a hole (hole diameter 6mm) was obtained from the injection and production pipe by mechanical processing. The sample was immersed in the liquid in the dynamic high-temperature autoclave. The liquid composition was 230g / L NaCl solution. The test temperature was set to 70°C, the compressed air partial pressure was 12MPa (at this time the oxygen partial pressure was about 2.5MPa), and the test time was 240h. The sample weight before and after the test was compared, and the uniform corrosion rate was calculated. The pitting pits were analyzed by laser confocal microscopy to calculate the maximum pitting rate.

[0085] Table 3.

[0086]

[0087]

[0088] It can be seen from Table 3 that the yield strength of the injection and production pipes of Examples 1-12 of the present invention is ≥390MPa, and the impact energy at 0°C is ≥89J; the uniform corrosion rate in 70°C, 230g / L NaCl solution, and 12MPa compressed air is ≤0.008mm / a, and the maximum pitting corrosion rate is ≤0.09mm / a. This fully demonstrates that the iron-nickel-based corrosion-resistant injection and production pipe of the present invention has good mechanical properties and corrosion resistance in a high-salt, high-pressure oxygen environment.

[0089] In contrast, the Cr content in Comparative Example 1 is insufficient, resulting in lower stability and protection performance of the oxide film.

[0090] The Ni content in Comparative Example 2 is insufficient, and residual ferrite exists in the material, so that the material does not have sufficient toughness, plasticity and hot working properties.

[0091] In Comparative Example 3, P and S exceed the upper limit, the impact toughness of the material is reduced, and the corrosion resistance of the alloy is also reduced.

[0092] The C content in Comparative Example 4 is higher than the scope of the present invention, which will result in a large amount of M in the austenitic alloy. 23 Precipitation phases such as C6, especially at the grain boundaries, are prone to produce chromium-depleted areas, thereby reducing the corrosion resistance of the alloy, especially the intergranular corrosion resistance.

[0093] In Comparative Example 5, the Al content is insufficient, thereby reducing the material's oxidation resistance in high-temperature water vapor and resulting in a high corrosion rate.

[0094] The Mo content in Comparative Example 6 is insufficient, so the material has poor pitting corrosion resistance.

[0095] In Comparative Example 7, the Cu content is insufficient, the cold work hardening of the material is serious, and cracks exist on the surface of the finished tube after rolling.

[0096] The Nb element content in Comparative Example 8 is insufficient, which reduces the strength of the material.

[0097] In Comparative Example 9, the contents of Si and Mn elements exceeded the upper limit, and the material toughness was low.

[0098] In Comparative Example 10, the cooling rate after hot extrusion exceeded the lower limit, resulting in coarse grains, reduced cold working performance of the material, and cracks on the surface of the finished tube after rolling.

[0099] In Comparative Example 11, the cooling rate after solution treatment exceeded the lower limit, resulting in Cr 23 A large amount of carbides such as C6 precipitate, reducing the toughness and corrosion resistance of the material.

[0100] In Comparative Example 12, the aging treatment temperature exceeded the lower limit, resulting in Cr 23 A large amount of carbides such as C6 precipitate, reducing the toughness and corrosion resistance of the material.

[0101] also, Figure 1 The microstructure photo of the iron-nickel-based corrosion-resistant injection and production pipe of Example 9 of the present invention is shown. Figure 1 It can be seen from the figure that it has a uniform 10-20 μm equiaxed austenite containing dispersed NbC precipitates.

[0102] It should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0103] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with the contents disclosed by those skilled in the art from the present invention, and all should belong to the protection scope of the present invention.

Claims

1. An iron-nickel-based corrosion-resistant injection and production pipe containing Fe and inevitable impurity elements, characterized in that: It also contains the following chemical elements in the following mass percentages: 0<C≤0.03%, 0<Si≤0.5%, 0<Mn≤1.0%, Cr: 25~35%, Ni: 30~40%, Mo: 3~5%, Al: 0.1~1.0%, Cu: 0.1~1.0%, Nb: 0.01~0.1%.

2. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1, characterized in that: The mass percentage of each chemical element is: 0<C≤0.03%, 0<Si≤0.5%, 0<Mn≤1.0%, Cr: 25~35%, Ni: 30~40%, Mo: 3~5%, Al: 0.1~1.0%, Cu: 0.1~1.0%, Nb: 0.01~0.1%; the balance is Fe and unavoidable impurity elements.

3. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: The mass percentage of each chemical element satisfies at least one of the following: 0＜C≤0.02％； 0<Si≤0.2%; 0<Mn≤0.5%; Cr：28～33％； Ni: 33-38%; Al：0.4～0.7％； Cu: 0.3-0.8%; Nb: 0.05~0.08%.

4. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: The mass percentage of each chemical element also satisfies: Ni eq ≥1.15×Cr eq -6.92; of which: Ni eq =Ni+30C+0.5Mn,Cr eq =Cr+Mo+1.5Si+0.5Nb, where each chemical element is substituted into the value before the percentage sign of its mass percentage.

5. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: Among the unavoidable impurity elements: P ≤ 0.03%, S ≤ 0.03%.

6. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: The microstructure is uniform 10-20μm equiaxed austenite containing dispersed NbC precipitation phase.

7. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: Its yield strength is 390~1100MPa, and its impact energy at 0℃ is 89~145J.

8. The iron-nickel-based corrosion-resistant injection and production pipe according to claim 1 or 2, characterized in that: Its pitting rate Rpiting≤0.1mm / a and uniform corrosion rate Rgen≤0.01mm / a in underground compressed air energy storage conditions with high salt and oxygen content at 30-90℃.

9. The method for manufacturing the iron-nickel-based corrosion-resistant injection-production pipe according to any one of claims 1 to 8, characterized in that: Includes steps: Smelting and casting to obtain ingots; Forging the ingot into a tube; Heating of tube blank; Hot extrusion: hot extrusion is performed on the tube blank to obtain a rough tube, and then the rough tube is immediately water-cooled at a cooling rate of ≥15℃ / s; Solution treatment: The solution treatment temperature is 1050-1150℃, and water cooling is performed after the insulation is completed. The cooling rate is ≥15℃ / s; Aging treatment: The aging treatment temperature is 850℃~930℃, the aging treatment time is 6~10min / mm, and water cooling is carried out after the insulation is completed, and the cooling rate is ≥10℃ / s; Cold rolled.

10. The manufacturing method according to claim 9, characterized in that In the tube blank heating step, the tube blank is heated to an extrusion temperature of 1100 to 1250°C.

11. The manufacturing method according to claim 9, characterized in that: In the hot extrusion step, the cooling rate of the rough pipe is 20-25°C / s.

12. The manufacturing method according to claim 9, characterized in that: In the solution treatment step, the cooling rate of water cooling after the heat preservation is 20 to 25°C / s.

13. The manufacturing method according to claim 9, characterized in that: In the aging treatment step, the aging treatment temperature is 900° C. to 930° C., and the aging treatment time is 6 to 8 min / mm.

14. The manufacturing method according to claim 9, characterized in that: In the cold rolling step, the cross-sectional reduction deformation is 20 to 50%.

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