Nickel-based alloy UNS N06022 seamless tube and preparation method thereof

Abstract

The invention discloses a nickel-based alloy UNS N06022 seamless tube and a preparation method thereof, the N06022 alloy is subjected to material composition design, proper typical content of each element is determined, other elements are added in a trace manner, and a proper preparation process is matched, so that the seamless tube is prepared. If the smelting level is controlled to ensure that the raw materials meet hot working conditions, a high-temperature homogenization process is formulated, heating and finish forging temperatures are controlled, and a forging process mode of fast forging and radial forging is adopted; therefore, the nickel-based alloy UNS N06022 seamless pipe with stable structure and excellent mechanical property and corrosion resistance is obtained, and the seamless pipe can be used as a reaction pipe, a pressure pipeline, a connecting pipe and the like to be applied to the large petrochemical field, especially to a green and clean production process of epichlorohydrin.

Description

Technical Field

[0001] The invention relates to the field of seamless steel pipes, and in particular to a nickel-based alloy UNS N06022 seamless pipe and a preparation method thereof. Background Art

[0002] UNS N06022 alloy is a nickel-based high-temperature alloy composed of nickel, molybdenum, cobalt, tungsten and other elements. It has excellent resistance to pitting, crevice corrosion and stress corrosion cracking. Compared with other nickel-chromium-molybdenum alloys (such as C-276, C4 and 625 alloys), it has better comprehensive corrosion resistance. At the same time, UNS N06022 alloy has excellent resistance to oxidation water media, and also performs well in wet chlorine, nitric acid or mixed acid containing oxidizing acids with chloride ions. And UNS N06022 alloy is one of the only few materials that can resist corrosion from wet chlorine, hypochlorite and chlorine dioxide solutions. The alloy has significant corrosion resistance to high-concentration chloride solutions (such as ferric chloride and cupric chloride) and has an extraordinary resistance to various chemical environments. Therefore, UNS N06022 alloy is widely used in the chemical and petrochemical fields, such as in components and catalytic systems that come into contact with chloride-containing organic matter, high-temperature inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), and seawater corrosion environments.

[0003] Seamless pipe is a long steel strip with a hollow cross-section and no seams around it. However, the domestic UNSN06022 alloy seamless pipe is currently mainly imported, with high prices and long delivery cycles, which seriously affects the promotion and development of my country's large-scale petrochemical projects.

[0004] The Chinese invention patent with the authorization announcement number CN 110743931 B discloses a preparation process for high-strength NS1402 nickel-based alloy seamless pipes, which includes: heat-treating the rough pipe blank and then cold-drawing it in three passes with continuous wall reduction and diameter reduction; the heat treatment method is: heat-treating the pipe blank at 1050-1080℃ and then water-quenching it, and the heat-treating time is: 1.8-2.1min / mm×tube blank wall thickness. However, the above process is only applicable to the preparation of high-strength NS1402 nickel-based alloy seamless pipes, and is not universal for nickel-based alloy UNS N06022 seamless pipes with higher corrosion resistance requirements.

[0005] Therefore, it is of great significance to provide a nickel-based alloy UNS N06022 seamless pipe and a preparation method thereof to realize the localization of the UNS N06022 alloy seamless pipe. Summary of the invention

[0006] To solve the above problems, in a first aspect, the present invention provides a nickel-based alloy UNS N06022 seamless pipe having high mechanical strength and excellent corrosion resistance.

[0007] The technical solution of the present invention to solve the above problems is as follows:

[0008] A nickel-based alloy UNS N06022 seamless pipe, the seamless pipe is made of nickel-based alloy UNS N06022, and the nickel-based alloy UNS N06022 comprises the following components by weight percentage:

[0009] C≤0.01%, Si≤0.08%, 0.20%≤Cr≤0.40%, P≤0.01%, S≤0.008%, 21.0%≤Cr≤22.5%, Co≤2.5%, 13.0%≤Mo≤14.5%, V≤0.35%, 2.8%≤W≤3.5%, 2.0%≤Fe≤6.0%, 0.0015%≤B≤0.0025%, 0.04%≤Ce≤0.08%, and the balance is Ni and other inevitable impurities.

[0010] Preferably, the nickel-based alloy UNS N06022 comprises the following components:

[0011] C≤0.01%, Si≤0.08%, 0.25%≤Cr≤0.35%, P≤0.01%, S≤0.005%, 21.3%≤Cr≤21.7%, Co≤2.5%, 13.2%≤Mo≤13.7%, V≤0.03%, 2.8%≤W≤3.4%, 2.5%≤Fe≤4.0%, 0.0015%≤B≤0.0025%, 0.05%≤Ce≤0.07%, and the balance is Ni and other inevitable impurities.

[0012] The present invention designs the material composition of N06022 alloy, determines the appropriate content of each typical element, and adds B and Ce. Among them, a trace amount of B can improve the thermoplasticity of the material and improve the processing plasticity. Ce segregates on the grain boundary and interacts with other elements, causing changes in the structure, chemical composition and energy of the grain boundary, and affects the diffusion of other elements and the nucleation and growth of new phases, ultimately leading to changes in the alloy structure and performance. In addition, Ce has a certain solid solution in the alloy, and its segregation at the grain boundary can inhibit the segregation of sulfur, phosphorus and low-melting-point inclusions at the grain boundary, and forms high-melting-point compounds with these inclusions, eliminating the harmful effects of low-melting-point inclusions, Ce purifies and strengthens the grain boundary, hinders the formation and expansion of intergranular cracks, and is conducive to improving the high-temperature plasticity and corrosion resistance of the seamless pipe.

[0013] In a second aspect, the present invention also provides a method for preparing the above-mentioned nickel-based alloy UNS N06022 seamless pipe, comprising the following steps:

[0014] S1. Raw material smelting:

[0015] S1-1, using metal manganese, metal chromium, metal nickel, metal molybdenum, metal tungsten, ferroboron and pure iron as main raw materials, configuring the raw materials according to the composition of the above-mentioned nickel-based alloy UNS N06022, smelting into molten steel, and pouring the molten steel to obtain an ingot;

[0016] S1-2, electroslag remelting the ingot to obtain an electroslag remelted ingot;

[0017] S1-3, subjecting the electroslag remelting ingot to high temperature homogenization and forging to form a round tube billet;

[0018] S2. Hot extrusion:

[0019] S2-1, sawing and segmenting the round tube, drilling, end surface processing, grinding, inspection and cleaning;

[0020] S2-2, preheating, primary induction heating, hole expansion, secondary induction heating, and hot extrusion are performed on the cleaned round tube billet in sequence to form a rough tube;

[0021] S3, cold processing: cold rolling the rough pipe to make pipes of required specifications;

[0022] S4. Bright heat treatment is performed on the cold-rolled pipe to obtain a nickel-based alloy UNS N06022 seamless pipe.

[0023] Preferably, in step S1-3, the high temperature homogenization temperature is 1150-1250°C.

[0024] Preferably, in step S1-3, the forging adopts fast-diameter combined forging, the final forging temperature is ≥850°C, and the forging ratio is ≥5.

[0025] The present invention formulates a high-temperature homogenization process, adopts a forging process of rapid forging + radial forging, and controls the homogenization and final forging temperatures and the forging ratio at the same time, so that the elements inside the nickel-based alloy UNS N06022 seamless pipe are evenly distributed, thereby improving the corrosion resistance and mechanical properties of the nickel-based alloy.

[0026] Preferably, in step S2-2, the preheating temperature is greater than 1000°C and the time is greater than 6 hours.

[0027] Preferably, in step S2-2, the primary induction heating temperature is 1120-1220°C, and the time is 1-5 min.

[0028] Preferably, in step S2-2, the secondary induction heating temperature is 1150-1250°C and the time is 2-4 minutes.

[0029] The present invention adopts a preheating method greater than 1000° C. to ensure that the center temperature and outer surface temperature of the round tube billet meet the requirements, and at the same time can improve the plasticity of the round tube billet; in the subsequent rapid induction heating, the temperature of the round tube billet can quickly reach the thermal expansion process temperature.

[0030] In addition, the present invention adopts a secondary induction heating method. During the first induction heating, the grains of the nickel-based alloy UNS N06022 material are refined and the plastic deformation is increased, which can improve the plasticity of the material; during the second induction heating, the grain boundaries are clarified, further enhancing the plasticity and uniformity of the material.

[0031] Preferably, in step S2, glass powder is used to lubricate the inner surface of the round tube blank after hole expansion; and glass powder is used to lubricate the outer surface of the round tube blank after secondary induction heating.

[0032] The main components of glass powder are SiO2, Al2O3, and TiO2. It is a melt lubricant. When glass powder comes into contact with high-temperature blanks, it can form a liquid film between the contact surface of the tool and the blank, achieving the purpose of separating the contact surfaces, thereby playing a role in lubrication and insulation. The addition of glass powder reduces the additional tensile stress when the metal is deformed, reduces the probability of product defects, and improves the quality of the internal and external surfaces.

[0033] During hot extrusion, it is necessary to select suitable extrusion dies to ensure good metal flow at high temperature and avoid defects on the inner and outer surfaces of the pipe due to die wear. The hot extrusion process has a large deformation, which can reach more than 90%, and can subject the metal to three-dimensional compressive stress, making the intergranular structure tighter. At the same time, for N06022 forging billets, the grain size itself is relatively coarse and there is a certain degree of unevenness. During the extrusion process, the grains are fully broken and refined, which brings better processing conditions for subsequent cold processing.

[0034] Preferably, when the rough pipe is cold rolled, the deformation amount of each pass is controlled below 60%.

[0035] The cold rolling process can produce a large deformation on the rough pipe while improving its internal structure, refining and homogenizing the grains, thereby improving the plasticity and mechanical properties of the seamless pipe.

[0036] Preferably, in step S4, the heat treatment temperature is 1100°C to 1160°C.

[0037] Heat treatment is carried out within the above temperature range so that the metallographic structure of the alloy can be stably formed, thereby improving the mechanical properties of the seamless pipe at high temperatures.

[0038] In a third aspect, the present invention also provides an application of the above-mentioned nickel-based alloy UNS N06022 seamless pipe, which can be applied in the chemical or petrochemical fields.

[0039] Preferably, the nickel-based alloy UNS N06022 seamless pipe can be used as a reaction tube, a pressure pipe, a connecting pipe, etc. in the large-scale petrochemical field, especially in the green and clean production process of epichlorohydrin.

[0040] The present invention has the following beneficial effects:

[0041] (1) The present invention designs the material composition of the N06022 alloy, determines the appropriate content of each typical element, adds other elements in trace amounts, and matches a suitable preparation process, such as controlling the smelting level to ensure that the raw materials meet the hot working conditions, formulating a high-temperature homogenization process, controlling the heating and final forging temperatures, and adopting a forging process of rapid forging + radial forging; thereby obtaining a nickel-based alloy UNS N06022 seamless pipe with stable structure, excellent mechanical properties and corrosion resistance;

[0042] (2) The nickel-based alloy UNS N06022 seamless pipe of the present invention has excellent mechanical properties at room temperature and high temperature, and also has excellent corrosion resistance in an environment of mixed corrosion of oxidizing salts and acids. It can be used as a reaction tube, pressure pipeline, connecting pipe, etc. in large-scale petrochemical fields, especially in the green and clean production process of epichlorohydrin. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a microstructure photo of the nickel-based alloy UNS N06022 seamless pipe of Example 1;

[0044] Figure 2 This is a microstructure photograph of the nickel-based alloy UNS N06022 seamless pipe of Example 2. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments of the specification. Those of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0046] Example 1

[0047] A method for preparing a nickel-based alloy UNS N06022 seamless pipe is as follows.

[0048] S1. Raw material smelting;

[0049] S1-1. Use a vacuum induction furnace to smelt high-quality raw materials such as metal manganese, metal chromium, metal nickel, metal molybdenum, metal tungsten, ferroboron, and pure iron. Use low-power smelting in the early stage. During the refining period, select a refining temperature of 1480°C, a refining time of 80 minutes, and adopt a two-stage refining. Use industrial frequency stirring during refining. After the composition is qualified, measure the temperature and tap the steel. Use a low superheat feeding casting method to pour the molten steel out of the furnace for casting to obtain an ingot. The composition (mass percentage) is as follows: C: 0.01%, Si: 0.08%, Mn: 0.25%, P: 0.01%, S: 0.005%, Cr: 21.3%, Co: 2.5%, Mo: 13.2%, V: 0.03%, W: 2.8%, Fe: 2.5%, B: 0.0015%, Ce: 0.06%, and the balance is Ni.

[0050] S1-2, welding the ingot with the electrode and remelting the electroslag. In order to improve the surface quality of the electroslag ingot and the non-metallic inclusions and corrosion performance of the alloy, CaF2 / Al2O3 / CaO / MgO quaternary slag is used in the electroslag process, which is fully purified to ensure the level of inclusions after remelting; at the same time, argon protective atmosphere is used for electroslag to reduce the gas content of the electroslag ingot; then the remelted electroslag ingot is cut and the surface is ground;

[0051] S1-3, fast-diameter combined forging: adopt the fast-diameter combined upsetting and drawing process, and carry out high-temperature homogenization of the electroslag ingot for more than 24 hours, fast forging upsetting and drawing, large deformation and full crushing, diameter forging and high-frequency small deformation, control the uniformity of the material structure, and obtain a round tube billet; wherein, the high-temperature homogenization temperature is 1200℃, the final forging temperature is 950℃, the forging ratio is 6, and the seamless tube specification is 215mm;

[0052] S1-4, finishing, peeling, sampling and testing the forged round tube blank;

[0053] S2, extrusion:

[0054] S2-1. Acceptance, sawing, segmentation, drilling, end surface processing, grinding inspection, and cleaning of forged round tube billets; drilling is to drill holes in the center of the tube billet, and the drilling process is carried out on a machine tool; the end surface processing adopts a single-sided chamfering method to increase the R angle and reduce the end cracking that occurs in the subsequent extrusion process;

[0055] S2-2, preheating the cleaned round tube billet in an annular furnace at a preheating temperature of 1050°C for 8 hours;

[0056] S2-3, the round tube billet after exiting the annular furnace is subjected to induction heating in an induction furnace at a temperature of 1180°C for 3 minutes;

[0057] S2-4, expanding the round tube blank after the primary induction heating, and lubricating the inner surface of the round tube blank with glass powder;

[0058] S2-5, the expanded round tube embryo is subjected to secondary induction heating in an induction furnace at a temperature of 1200°C for 3 minutes;

[0059] S2-6, lubricating the outer surface of the round tube billet after the secondary induction heating with glass powder, and then transferring it to an extruder for hot extrusion to obtain a rough tube, and performing finishing processes such as straightening, cutting, pickling, grinding and inspection on the rough tube;

[0060] S3. Cold processing: cold rolling is performed on the rough pipe after finishing process to the required specifications; the cold rolling is completed on a long-stroke ring-type cold rolling mill, and the deformation of each pass is controlled below 60%; after each cold processing, the material is annealed and heat treated to eliminate work hardening and restore the plasticity of the material;

[0061] S4. Bright heat treatment: After the last cold rolling, the pipe is heat treated by bright heat treatment process. Before heat treatment, the inner surface of each row of pipes is inspected. The whole heat treatment process requires clean production, and the heat treatment temperature is 1130℃.

[0062] Example 2

[0063] It is basically the same as Example 1, except that:

[0064] S1-1. High-quality raw materials such as metallic manganese, metallic chromium, metallic nickel, metallic molybdenum, metallic tungsten, ferroboron and pure iron are smelted in a vacuum induction furnace, and low-power smelting is used in the early stage; in the refining period, a refining temperature of 1480°C and a refining time of 80 minutes are selected, and two-stage refining is adopted, and industrial frequency stirring is used during refining; after the composition is qualified, the temperature is measured and the steel is tapped, and a low superheat feeding casting method is adopted to pour the molten steel out of the furnace for casting to obtain an ingot; wherein the composition (mass percentage) is as follows: C: 0.01%, Si: 0.08%, Mn: 0.35%, P: 0.01%, S: 0.005%, Cr: 21.7%, Co: 2.5%, Mo: 13.7%, V: 0.03%, W: 3.4%, Fe: 4.0%, B: 0.0025%, Ce: 0.06%, and the remainder is Ni.

[0065] Example 3

[0066] It is basically the same as Example 1, except that:

[0067] S1-1. High-quality raw materials such as metallic manganese, metallic chromium, metallic nickel, metallic molybdenum, metallic tungsten, ferroboron and pure iron are smelted in a vacuum induction furnace, and low-power smelting is used in the early stage; in the refining period, a refining temperature of 1480°C and a refining time of 80 minutes are selected, and two-stage refining is adopted, and industrial frequency stirring is used during refining; after the composition is qualified, the temperature is measured and the steel is tapped, and a low superheat feeding casting method is adopted to pour the molten steel out of the furnace for casting to obtain an ingot; wherein the composition (mass percentage) is as follows: C: 0.01%, Si: 0.08%, Mn: 0.3%, P: 0.01%, S: 0.005%, Cr: 21.5%, Co: 2.5%, Mo: 13.5%, V: 0.03%, W: 3.2%, Fe: 3.0%, B: 0.0020%, Ce: 0.06%, and the remainder is Ni.

[0068] Example 4

[0069] It is basically the same as Example 3, except that:

[0070] S1-3, fast-diameter combined forging: adopt the fast-diameter combined upsetting and drawing process, and carry out high-temperature homogenization of the electroslag ingot for more than 24 hours, fast forging upsetting and drawing, large deformation and full crushing, diameter forging and high-frequency small deformation, control the uniformity of the material structure, and obtain a round tube billet; wherein, the high-temperature homogenization temperature is 1150℃, the final forging temperature is 950℃, the forging ratio is 6, and the seamless tube specification is 215mm;

[0071] S2-2, preheating the cleaned round tube billet in a ring furnace at a preheating temperature of 1010°C for 8 hours;

[0072] S2-3, the round tube billet after exiting the annular furnace is subjected to induction heating in an induction furnace at a temperature of 1120° C. for 5 minutes;

[0073] S2-5, the expanded round tube embryo is subjected to secondary induction heating in an induction furnace at a temperature of 1150° C. for 4 minutes;

[0074] S4. Bright heat treatment: After the last cold rolling, the pipe is heat treated by bright heat treatment process. Before heat treatment, the inner surface of each row of pipes is inspected. The whole heat treatment process requires clean production, and the heat treatment temperature is 1100℃.

[0075] Example 5

[0076] It is basically the same as Example 3, except that:

[0077] S1-3, fast-diameter combined forging: adopt the fast-diameter combined upsetting and drawing process, and carry out high-temperature homogenization of the electroslag ingot for more than 24 hours, fast forging upsetting and drawing, large deformation and full crushing, diameter forging and high-frequency small deformation, control the uniformity of the material structure, and obtain a round tube billet; wherein, the high-temperature homogenization temperature is 1250℃, the final forging temperature is 950℃, the forging ratio is 6, and the seamless tube specification is 215mm;

[0078] S2-2, preheating the cleaned round tube in an annular furnace at a temperature of 1200°C for 8 hours;

[0079] S2-3, the round tube billet after exiting the annular furnace is subjected to induction heating in an induction furnace at a temperature of 1220°C for 2 minutes;

[0080] S2-5, the expanded round tube embryo is subjected to secondary induction heating in an induction furnace at a temperature of 1250°C for 2 minutes;

[0081] S4. Bright heat treatment: After the last cold rolling, the pipe is heat treated with bright heat treatment process. Before heat treatment, the inner surface of each row of pipes is inspected. The whole heat treatment process requires clean production, and the heat treatment temperature is 1160℃.

[0082] Comparative Example 1

[0083] It is basically the same as Example 3, except that:

[0084] S1-1. High-quality raw materials such as metallic manganese, metallic chromium, metallic nickel, metallic molybdenum, metallic tungsten, ferroboron and pure iron are smelted in a vacuum induction furnace, and low-power smelting is used in the early stage; in the refining period, a refining temperature of 1480°C and a refining time of 80 minutes are selected, and two-stage refining is adopted, and industrial frequency stirring is used during refining; after the composition is qualified, the temperature is measured and the steel is tapped, and a low superheat feeding casting method is adopted to pour the molten steel out of the furnace for casting to obtain an ingot; wherein the composition (mass percentage) is as follows: C: 0.01%, Si: 0.08%, Mn: 0.3%, P: 0.01%, S: 0.005%, Cr: 21.5%, Co: 2.5%, Mo: 13.5%, V: 0.03%, W: 3.2%, Fe: 3.0%, and the remainder is Ni.

[0085] Comparative Example 2

[0086] It is basically the same as Example 3, except that:

[0087] S1-3, fast-diameter combined forging: adopt the fast-diameter combined upsetting and drawing process, and carry out high-temperature homogenization of the electroslag ingot for more than 24 hours, fast forging upsetting and drawing, large deformation and sufficient crushing, diameter forging and high-frequency small deformation, control the uniformity of the material structure, and obtain a round tube billet; among which, the high-temperature homogenization temperature is 900℃, the final forging temperature is 750℃, the forging ratio is 6, and the seamless tube specification is 215mm.

[0088] Comparative Example 3

[0089] It is basically the same as Example 3, except that:

[0090] S2-2, preheating the cleaned round tube billet in a ring furnace at a preheating temperature of 850°C for 8 hours;

[0091] S2-3, the round tube billet after exiting the annular furnace is subjected to induction heating in an induction furnace at a temperature of 1000°C for 5 minutes;

[0092] S2-5. The expanded round tube blank is subjected to secondary induction heating in an induction furnace at a temperature of 1050° C. for 4 minutes.

[0093] Comparative Example 4

[0094] It is basically the same as Example 3, except that:

[0095] S4. Bright heat treatment: After the last cold rolling, the pipe is heat treated by bright heat treatment process. Before heat treatment, the inner surface of each row of pipes is inspected. The whole heat treatment process requires clean production, and the heat treatment temperature is 1050℃.

[0096] The room temperature tensile properties (25°C) and high temperature tensile properties at 250°C of the nickel-based alloy UNS N06022 seamless pipes prepared in Examples 1 to 5 and Comparative Examples 1 to 4 were tested; the test results are shown in Table 1.

[0097] Table 1: Room temperature and high temperature tensile properties test data table of the above examples and comparative examples

[0098]

[0099] According to ASTM G28 B method, an intergranular corrosion test (oxidizing salt and acid mixed corrosion) was carried out to detect the corrosion resistance of the above embodiments and comparative examples; the test results are shown in Table 2.

[0100] Table 2: Corrosion resistance data of the above examples and comparative examples

[0101] Corrosion rate (mm / y) Example 1 0.23 Example 2 0.15 Example 3 0.11 Example 4 0.17 Example 5 0.25 Comparative Example 1 0.28 Comparative Example 2 0.35 Comparative Example 3 0.33 Comparative Example 4 0.47

[0102] According to Table 1, the room temperature tensile properties and 250°C high temperature tensile properties of Examples 1 to 5 are better than those of Comparative Examples 1 to 4, indicating that compared with Comparative Example 1 in which no B and Ce elements are added, Comparative Example 2 in which the homogenization and final forging temperatures are too low, Comparative Example 3 in which the preheating and two induction heating temperatures are too low, and Comparative Example 4 in which the heat treatment temperature is too low, the nickel-based alloy UNS N06022 seamless pipe prepared by the method of the present invention has a room temperature of 25°C: R m ≥760MPa, R p0.2 >375MPa, A>60%, at 250℃ high temperature: R m >665MPa、R p0.2 ≥325MPa, A>45%, indicating that it has excellent mechanical properties.

[0103] According to Table 2, the corrosion resistance of Examples 1 to 5 is better than that of Comparative Examples 1 to 4, indicating that the nickel-based alloy UNS N06022 seamless pipe prepared by the method of the present invention has excellent corrosion resistance.

Claims

1. A nickel-based alloy UNS N06022 seamless pipe, characterized in that: The seamless pipe is made of a nickel-based alloy UNS N06022, and the nickel-based alloy UNS N06022 comprises the following components by weight percentage: C≤0.01%, Si≤0.08%, 0.20%≤Cr≤0.40%, P≤0.01%, S≤0.008%, 21.0%≤Cr≤22.5%, Co≤2.5%, 13.0%≤Mo≤14.5%, V≤0.35%, 2.8%≤W≤3.5%, 2.0%≤Fe≤6.0%, 0.0015%≤B≤0.0025%, 0.04%≤Ce≤0.08%, and the balance is Ni and other inevitable impurities.

2. A nickel-based alloy UNS N06022 seamless pipe according to claim 1, characterized in that: The nickel-based alloy UNS N06022 contains the following components: C≤0.01%, Si≤0.08%, 0.25%≤Cr≤0.35%, P≤0.01%, S≤0.005%, 21.3%≤Cr≤21.7%, Co≤2.5%, 13.2%≤Mo≤13.7%, V≤0.03%, 2.8%≤W≤3.4%, 2.5%≤Fe≤4.0%, 0.0015%≤B≤0.0025%, 0.05%≤Ce≤0.07%, and the balance is Ni and other inevitable impurities.

3. The method for preparing a nickel-based alloy UNS N06022 seamless pipe according to any one of claims 1 to 2, characterized in that: The following steps are involved: S1. Raw material smelting: S1-1, using metal manganese, metal chromium, metal nickel, metal molybdenum, metal tungsten, ferroboron and pure iron as main raw materials, preparing the raw materials according to the composition of the nickel-based alloy UNS N06022 described in any one of claims 1 to 2, smelting into molten steel, and pouring the molten steel to obtain an ingot; S1-2, electroslag remelting the ingot to obtain an electroslag remelted ingot; S1-3, subjecting the electroslag remelting ingot to high temperature homogenization and forging to form a round tube billet; S2. Hot extrusion: S2-1, sawing and segmenting the round tube, drilling, end surface processing, grinding, inspection and cleaning; S2-2, preheating, primary induction heating, hole expansion, secondary induction heating, and hot extrusion are performed on the cleaned round tube billet in sequence to form a rough tube; S3, cold processing: cold rolling the rough pipe to make pipes of required specifications; S4. Bright heat treatment is performed on the cold-rolled pipe to obtain a nickel-based alloy UNS N06022 seamless pipe.

4. The preparation method according to claim 3, characterized in that: In step S1-3, the high temperature homogenization temperature is 1150-1250°C.

5. The preparation method according to claim 3, characterized in that: In step S1-3, the forging adopts fast-diameter combined forging, the final forging temperature is ≥850°C, and the forging ratio is ≥5.

6. The preparation method according to claim 3, characterized in that: In step S2-2, the preheating temperature is greater than 1000°C and the time is greater than 6 hours.

7. The preparation method according to claim 3, characterized in that: In step S2-2, the primary induction heating temperature is 1120-1220°C and the time is 1-5 minutes.

8. The preparation method according to claim 3, characterized in that: In step S2-2, the secondary induction heating temperature is 1150-1250°C and the time is 2-4 minutes.

9. The preparation method according to claim 3, characterized in that: In step S4, the heat treatment temperature is 1100°C to 1160°C.

10. Use of the nickel-based alloy UNS N06022 seamless pipe obtained by the preparation method according to any one of claims 3 to 9 in the chemical or petrochemical fields.

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