A method for closed-die swaging of a hydrogenation reactor closure cylinder

Abstract

The application provides a kind of hydroprocessing reactor necking cylinder section integrated forging method, it relates to the field of forging technology, the integrated forging method is used in the application, by successively upsetting, punching, core rod lengthening, pre-bore, lengthening blank, necking lengthening and bore out finished product to the blank, get finished product forgings;In the process of necking lengthening and bore out finished product, special necking sleeve is used, the special necking sleeve can get the finished product forgings of intermediate straight section, two ends necking, the finished product forgings are segmented, two straight section size same, necking section inner diameter same or different necking cylinder section can be obtained. The method of the application can realize the integrated forging of two straight section size same, necking section inner diameter same or different necking cylinder section, reduce the total heating times of forging two necking cylinder sections, effectively shorten the production cycle, thereby can significantly improve the production efficiency, and can greatly improve the material utilization rate, can also meet the production demand of different specifications of necking cylinder section.

Description

Technical Field

[0001] This invention relates to the field of forging technology, and more specifically, to a combined forging method for the closing section of a hydrogenation reactor. Background Technology

[0002] In the petrochemical industry, hydrogenation reactors are one of the core pieces of equipment, and their performance and quality directly affect the safety and stability of the entire chemical production process. The tank section closing technology of hydrogenation reactors is a crucial link in the manufacturing process. The closing section mainly consists of a straight section and a closing section, located at the connection between the reactor body and the skirt or head, and it plays a vital role in structural transition and load transfer. In actual chemical production processes, the closing section needs to withstand complex conditions such as high temperature, high pressure, and corrosive media. Therefore, its manufacturing quality and performance are subject to extremely high requirements. Currently, existing hydrogenation reactor tank section closing manufacturing methods mainly use closing auxiliary tools such as closing sleeves or closing platform sleeves for reaming with enlarged holes. This manufacturing method has certain advantages, such as forging the tank section and adjacent transition sections as a single unit, prioritizing material utilization, and reducing the number of welds. The reduction of welds helps improve the overall structural strength and sealing performance, reducing safety hazards caused by weld defects. However, when using existing manufacturing processes, only one closing section can be produced from one steel ingot, resulting in low production efficiency. Summary of the Invention

[0003] The problem solved by this invention is that, when using existing manufacturing processes to produce end cap sections, only one end cap section can be produced from one steel ingot, resulting in low production efficiency.

[0004] To address the aforementioned problems, this invention provides a forging method for a hydrotreating reactor end section, based on a dedicated end sleeve. The dedicated end sleeve comprises a first cylinder, a second cylinder, and a third cylinder coaxially arranged and connected sequentially. The first cylinder, the second cylinder, and the third cylinder have the same inner diameter, and the first cylinder and the third cylinder have the same outer diameter. The outer diameters of the first cylinder and the third cylinder are both smaller than the outer diameter of the second cylinder. A first thickened cylinder is fitted onto the side wall of the first cylinder to reduce the height difference between the side walls of the first cylinder and the second cylinder. A second thickened cylinder is fitted onto the side wall of the third cylinder to reduce the height difference between the side walls of the third cylinder and the second cylinder. The forging and tempering method includes: Step S1: After heating the steel ingot to a preset temperature and holding it for a preset time, cut off the waste material and riser from the ingot body at the sprue end to obtain the billet; Step S2: The billet is sequentially upsetting, punching, mandrel drawing, pre-expansion, and drawing and blanking to obtain the first preformed billet; Step S3: The first preform blank is drawn and elongated by using an upper flat anvil, a lower V-shaped anvil and a special closing sleeve to obtain a second preform blank. Step S4: Using a lever, the special end cap sleeve, and the reaming hammer, the second preformed billet is reamed to produce the finished product. Step S5: Divide the finished forging into two tapered cylindrical forgings.

[0005] Optionally, the sidewall thickness of the first thickened cylinder and the second thickened cylinder are the same.

[0006] Optionally, the sidewall thicknesses of the first thickened cylinder and the second thickened cylinder are different.

[0007] Optionally, the end of the first thickened cylinder facing away from the second cylinder is connected to the first cylinder by bolts.

[0008] Optionally, the end of the second thickened cylinder opposite to the second cylinder is connected to the third cylinder by bolts.

[0009] Optionally, in step S1, the material of the steel ingot is selected from one of the following: 12Cr2Mo1V steel, 16Mn steel, 15CrMo steel, 14Cr1Mo steel, 21 / 4Cr-1Mo-1 / 4V steel, 12Cr2Mo1 steel, 9Cr1MoV steel, 3Cr-1Mo-1 / 4V steel, 20MnMo steel, 20MnNiMo steel, 20MnMoNb steel, SA-765-Ⅱ steel, and SA-508GR.3Cl.1 steel.

[0010] Optionally, in step S1, the steel ingot is a double-vacuum steel ingot.

[0011] Optionally, in step S1, the preset temperature is 600°C to 650°C.

[0012] Optionally, in step S1, the preset time is not less than 10 hours.

[0013] Optionally, in step S5, the finished forging is divided by gas cutting.

[0014] Compared with related technologies, the forging method adopted in this invention involves sequentially upsetting, punching, mandrel drawing, pre-expansion, drawing and blanking, end-drawing and reaming of the billet to obtain the finished forging. A special end-drawing sleeve is used during the end-drawing and reaming process. This sleeve allows for the production of a finished forging with a straight section in the middle and end-drawing. Dividing this forging yields two end-drawing cylindrical sections with the same straight section dimensions and different inner diameters at the end-drawing sections. Specifically, the third cylinder of the special end-drawing sleeve forms the straight sections of the two end-drawing cylindrical sections. The first cylinder adjusts its height difference with the second cylinder via a first thickening cylinder. The first cylinder and the first thickening cylinder work together to form the end-drawing section of one end-drawing cylindrical section. The third cylinder adjusts its height difference with the second cylinder via a second thickening cylinder. The third cylinder and the second thickening cylinder work together to form the end-drawing section of the other end-drawing cylindrical section. The method of this invention enables the integrated forging of two converging cylindrical sections with identical straight sections and identical or different inner diameters at the converging ends. This reduces the total number of forging passes for the two converging cylindrical sections from 14 passes (traditional method) to 7 passes, effectively shortening the production cycle and significantly improving production efficiency. Furthermore, by using the same steel ingot forging two converging cylindrical sections, this invention reduces waste material at the ingot's nozzle and riser, greatly improving material utilization. Additionally, by employing first and second thickened cylinders of different thicknesses, this method can accommodate different converging end inner diameters (including those with different diameters and those with the same diameter), thus meeting the production needs of converging cylindrical sections of various specifications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the special closing sleeve in an embodiment of the present invention; Figure 2 This is the front view of the second thickened cylinder; Figure 3 This is a side view of the second thickened cylinder; Figure 4 This is a segmented diagram of the reactor during the integrated forging of two straight sections with the same dimensions and the same inner diameter of the constricted section, according to one embodiment of the present invention. Figure 5 A schematic diagram of the structure of the finished forging obtained by integral forging of two constricted cylinder sections with the same straight section size and the same constricted section inner diameter in one embodiment of the present invention; Figure 6 This is a segmented diagram of the reactor during the integrated forging of two straight sections with the same dimensions but different inner diameters at the constriction sections, according to another embodiment of the present invention. Figure 7 This is a schematic diagram of the structure of the finished forging obtained when two constriction cylinder sections with the same straight section size but different constriction inner diameters are integrally forged in another embodiment of the invention. Figure 8 This is a schematic diagram of the finished forging in Example 1; Figure 9 This is a schematic diagram of the drawing and cutting of the third intermediate billet in Example 1; Figure 10 This is a schematic diagram of the first preform blank in Example 1; Figure 11 This is a schematic diagram of the first preformed blank before it is drawn back and elongated in Example 1; Figure 12 This is a schematic diagram of the first preformed blank after it has been drawn and elongated in Example 1; Figure 13 This is a schematic diagram of the second preform blank after hole enlargement in Example 1; Figure 14 This is a schematic diagram of the finished product produced after the second preform blank is expanded with holes in Example 1.

[0016] Explanation of reference numerals in the attached figures: 1. Special closing sleeve; 11. First cylinder; 12. Second cylinder; 13. Third cylinder; 14. First thickened cylinder; 15. Second thickened cylinder; 2. Left closing cylinder section; 3. Gas cutting blade section; 4. Right closing cylinder section. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0019] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this invention are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] This invention provides a method for forging and sealing a hydrotreating reactor neck section, based on a dedicated neck sleeve 1, such as... Figure 1 As shown, the special sealing sleeve 1 includes a first cylinder 11, a second cylinder 12, and a third cylinder 13 coaxially arranged and connected in sequence; the first cylinder 11, the second cylinder 12, and the third cylinder 13 have the same inner diameter, the first cylinder 11 and the third cylinder 13 have the same outer diameter, and the outer diameters of the first cylinder 11 and the third cylinder 13 are both smaller than the outer diameter of the second cylinder 12. A first thickened cylinder 14 is sleeved on the side wall of the first cylinder 11, and the first thickened cylinder 14 is used to reduce the diameter of the sealing sleeve. The height difference between the side walls of the first cylinder 11 and the second cylinder 12; the side wall of the third cylinder 13 is fitted with a second thickened cylinder 1515, which is used to reduce the height difference between the side walls of the third cylinder 13 and the second cylinder 12; the inner diameter of the special closing sleeve 1 is D1, the outer diameter of the second cylinder 12 is D2, the length of the second cylinder 12 is L, the outer diameters of the first cylinder 11 and the third cylinder 13 are both D3, and the lengths of the first cylinder 11 and the third cylinder 13 are both L1; The forging and tempering method includes: Step S1: After heating the steel ingot to a preset temperature and holding it for a preset time, cut off the waste material and riser from the ingot body at the sprue end to obtain the billet; Step S2: The billet is sequentially upsetting, punching, mandrel drawing, pre-expansion, and drawing and blanking to obtain the first preformed billet; Step S3: The first preform blank is drawn and elongated by using an upper flat anvil, a lower V-shaped anvil and a special closing sleeve 1 to obtain a second preform blank. Step S4: Using a lever, the special closing sleeve 1 and the reaming hammer, the second preformed billet is reamed to produce the finished product. Step S5: Divide the finished forging into two tapered cylindrical forgings.

[0021] The forging method used in this embodiment of the invention involves sequentially upsetting, punching, mandrel drawing, pre-expanding, drawing and blanking, end-drawing and reaming to obtain finished forgings from the billet. A special end-drawing sleeve 1 is used in the end-drawing and reaming process to obtain finished forgings. The special end-drawing sleeve 1 can be used to obtain finished forgings with a straight section in the middle and end-drawing. By dividing the finished forging, two end-drawing cylinder sections with the same straight section size and the same or different end-drawing inner diameters can be obtained. Specifically, the third cylinder 13 of the special closing sleeve 1 is used to form the straight sections of two closing cylinder sections. The first cylinder 11 adjusts its height difference with the second cylinder 12 through the first thickening cylinder 141. The first cylinder 11 and the first thickening cylinder 14 cooperate to form the closing section of one closing cylinder section. The third cylinder 13 adjusts its height difference with the second cylinder 12 through the second thickening cylinder 15. The third cylinder 13 and the second thickening cylinder 15 cooperate to form the closing section of the other closing cylinder section. Using the method of the present invention, it is possible to achieve integrated forging of two closing cylinder sections with the same straight section size and the same or different inner diameters of the closing sections, reducing the total number of forging times for two closing cylinder sections from 14 times (traditional method) to 7 times, effectively shortening the production cycle and thus significantly improving production efficiency. Moreover, the embodiments of the present invention use the same steel ingot to forge two closing cylinder sections, reducing the amount of waste material at the ingot nozzle and riser, and can greatly improve the material utilization rate. In addition, by using the method of the present invention, by employing a first thickened cylinder 14 and a second thickened cylinder 15 of different thicknesses, it is possible to adapt to different inner diameter sizes of the constriction (including different diameters and the same diameter), thereby meeting the production needs of constriction cylinder sections of different specifications.

[0022] Before forging, the reactor needs to be properly segmented. The dimensions of the straight sections of the cylindrical sections connecting to the transition section or end caps need to be adjusted. While avoiding interference with reactor-related pipes and other measuring instruments, the forging length of the two tapered cylindrical sections and the total length of the gas cutting edge should be less than the length of the special tapering sleeve 1. The inner diameter of the tapering end of the cylindrical section can be adjusted by changing the size of adjacent end caps. By increasing the end cap size and reducing the center distance between the end caps, the difference between the inner diameter of the tapering end and the inner diameter of the straight section end of the finished forging should be less than the single-sided drop height of the special stepped sleeve. By installing a first thickened cylinder 14 and a second thickened cylinder 15 of different thicknesses, and adjusting the single-sided drop height, the purpose of forging the two tapered cylindrical sections together can be achieved.

[0023] In some embodiments of the present invention, such as Figure 1As shown, the first thickened cylinder 14 and the second thickened cylinder 15 have the same structure. Taking the second thickened cylinder 15 as an example, the structure of the two is described as follows: Figure 2 and Figure 3 As shown, the second thickened cylinder 15 is a cylindrical structure open at both ends. An annular flange is provided on the inner wall of the end of the second thickened cylinder 15 opposite to the second cylinder 12. The annular flange has uniformly distributed through holes along its axial direction. The second cylinder 12 has threaded holes corresponding to the through holes. The end of the second thickened cylinder 15 opposite to the second cylinder 12 is connected to the third cylinder 13 by bolts. Similarly, the first thickened cylinder 141 is a cylindrical structure open at both ends. An annular flange is provided on the inner wall of the end of the first thickened cylinder 14 opposite to the second cylinder 12. The annular flange has uniformly distributed through holes along its axial direction. The second cylinder 12 has threaded holes corresponding to the through holes. The end of the first thickened cylinder 14 opposite to the second cylinder 12 is connected to the first cylinder 11 by bolts.

[0024] When forging two constricted cylinder sections with identical straight section dimensions and identical constricted inner diameter into a single unit, the sectioning diagram is as follows: Figure 4 As shown, at this time, the sidewall thickness of the first thickened cylinder 14 and the second thickened cylinder 15 is the same, and the finished forging obtained is as follows: Figure 5 As shown, the finished forging can be considered as consisting of a left constricted cylindrical section 2, an oxy-fuel cutting edge section 3, and a right constricted cylindrical section 4. The inner diameter of the constricted section of the left constricted cylindrical section 2 is the same as the inner diameter of the constricted section of the right constricted cylindrical section 4.

[0025] When forging two constricted cylinder sections with the same straight section dimensions but different constriction inner diameters, the section diagram is as follows: Figure 6 As shown, at this time, the sidewall thicknesses of the first thickened cylinder 14 and the second thickened cylinder 15 are different, and the finished forgings obtained are as follows: Figure 7 As shown, the finished forging can be considered as consisting of a left constricted cylindrical section 2, an oxy-fuel cutting edge section 3, and a right constricted cylindrical section 4. The inner diameter of the constricted section of the left constricted cylindrical section 2 is different from that of the constricted section of the right constricted cylindrical section 4.

[0026] In some embodiments of the present invention, in step S1, the steel ingot is selected from one of the following: 12Cr2Mo1V steel, 16Mn steel, 15CrMo steel, 14Cr1Mo steel, 21 / 4Cr-1Mo-1 / 4V steel, 12Cr2Mo1 steel, 9Cr1MoV steel, 3Cr-1Mo-1 / 4V steel, 20MnMo steel, 20MnNiMo steel, 20MnMoNb steel, SA-765-Ⅱ steel, and SA-508GR.3Cl.1 steel, and the steel ingot is a double-vacuum steel ingot.

[0027] In some embodiments of the present invention, in step S1, the preset temperature is 600°C to 650°C, and the preset time is not less than 10 hours.

[0028] In some embodiments of the present invention, in step S5, the finished forging is divided by gas cutting.

[0029] The present invention will be further described below with reference to specific embodiments.

[0030] Example 1 This embodiment is a forged composite forging of a single-unit hydrogenation reactor with tapered sections at both ends. One end is a tapered section connecting the section to the end cap (without a transition section), and the other end is a tapered section with a transition section. The finished forging is as follows: Figure 8 As shown, the specifications of the special sealing sleeve used are as follows: the inner diameter D1 of the special sealing sleeve is 1250mm, the outer diameter D2 of the second cylinder is 2450mm, the length L of the second cylinder is 3100mm, the outer diameter D3 of the first and third cylinders is 1850mm, the length L1 of the first and third cylinders is 900mm, the side wall thickness of the first thickened cylinder is 200mm, and the side wall thickness of the second thickened cylinder is 100mm.

[0031] The specific forging process is as follows: A1. After heating the double-vacuum steel ingot to a preset temperature and holding it for a preset time, cut off 150mm of the ingot body waste at the sprue end and the riser, thereby reducing metallurgical defects such as shrinkage cavities and slag inclusions in the steel ingot to obtain a billet; wherein, the preset temperature is 625℃, the preset time is 15h, and the material of the double-vacuum steel ingot is 12Cr2Mo1V steel.

[0032] A2. After heating the billet to 1270℃ and holding it for 60 hours, the billet is upturned to a height of 2250mm and a diameter of 4360mm, and then punched to obtain the first intermediate billet; the inner diameter of the first intermediate billet is 1400mm.

[0033] A3. After heating the first intermediate billet to 1260℃ and holding it for 15 hours, the mandrel is drawn to obtain the second intermediate billet. The inner diameter of the second intermediate billet is 1380mm, the outer diameter is 3670mm, and the length is 3450mm.

[0034] A4. After heating the second intermediate billet to 1260℃ and holding it for 15 hours, pre-expand the hole using a lever to obtain the third intermediate billet; the inner diameter of the third intermediate billet is 2500mm, the outer diameter is 4200mm, and the length is 3450mm.

[0035] A5, such as Figure 9As shown, after heating the third intermediate billet to 1260℃ and holding it at that temperature for 15 hours, it is then drawn and cut using an upper flat anvil, a lower V-anvil, a lever, and a round sleeve to obtain the first preformed billet; as Figure 10 As shown, the first preform is a stepped cylinder with flanges at both ends, and the dimensions of the first preform are as follows. Figure 10 As shown. It should be noted that, Figure 9 In the diagram, A represents the upper flat anvil, B represents the lower V-shaped anvil, C represents the third intermediate blank, and D represents the round sleeve.

[0036] A6. After heating the first preformed blank to 1260℃ and holding it at that temperature for 12 hours, as follows: Figure 11 As shown, an upper flat anvil, a lower V-shaped anvil, and a special closing sleeve are used to lengthen and close the first preform blank, so that the outer diameter of both ends of the blank is the same as that of the middle section, and the inner wall of the blank fits against the special closing sleeve, to obtain the second preform blank, as shown. Figure 12 As shown. Specifically, the upper flat anvil and the lower V-anvil are used to flatten the flange protrusions at both ends of the first preform blank, so that the outer diameter of the side walls of the blank is consistent; during the drawing and tightening process, a special tightening sleeve penetrates the inner cavity of the blank as a forming mold for the inner wall of the second preform blank. It should be noted that... Figure 11 In this diagram, A represents the upper flat anvil, B represents the lower V-anvil, and E represents the first preform blank. Figure 12 F in the middle represents the second preform blank.

[0037] A7. After heating the second preform to 1260℃ and holding it at that temperature for 9 hours, as follows: Figure 13 and Figure 14 As shown, a lever, the special end cap, and a reaming hammer are used to expand the hole in the second preformed billet to produce the finished forging; as shown... Figure 13 and Figure 14 As shown, during the process of expanding the hole to produce the finished product, a special closing sleeve is inserted through the inner cavity of the blank. Figure 13 and Figure 14 In the diagram, G represents the reaming hammer, and H represents the lever. Figure 14 The letter I in the middle represents the finished forging.

[0038] A8. After marking the gas cutting edge on the finished forging, the forging is divided to obtain two tapered cylindrical forgings.

[0039] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A method for forging a shrinkage sleeve for a hydrogenation reactor, based on a dedicated shrinkage sleeve (1), characterized in that, The special closing sleeve (1) includes a first cylinder (11), a second cylinder (12), and a third cylinder (13) that are coaxially arranged and connected in sequence; the first cylinder (11), the second cylinder (12), and the third cylinder (13) have the same inner diameter, the first cylinder (11) and the third cylinder (13) have the same outer diameter, the outer diameter of the first cylinder (11) and the third cylinder (13) are both smaller than the outer diameter of the second cylinder (12), the side wall of the first cylinder (11) is fitted with a first thickened cylinder (14), the first thickened cylinder (14) is used to reduce the height difference between the side walls of the first cylinder (11) and the second cylinder (12), the side wall of the third cylinder (13) is fitted with a second thickened cylinder (15), the second thickened cylinder (15) is used to reduce the height difference between the side walls of the third cylinder (13) and the second cylinder (12); The forging and tempering method includes: Step S1: After heating the steel ingot to a preset temperature and holding it for a preset time, cut off the waste material and riser from the ingot body at the sprue end to obtain the billet; Step S2: The billet is sequentially upsetting, punching, mandrel drawing, pre-expansion, and drawing blanking to obtain a first preformed billet; the first preformed billet is a stepped cylinder with flanges at both ends; Step S3: Use the upper flat anvil, the lower V anvil and the special closing sleeve (1) to close and lengthen the first preform blank, flatten the flange protrusions at both ends of the first preform blank so that the outer diameter of the side wall of the blank is consistent, and obtain the second preform blank. Step S4: Using a lever, the special closing sleeve (1) and the reaming hammer, the second preformed billet is reamed to produce the finished product. Step S5: Divide the finished forging into two tapered cylindrical forgings.

2. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, The first thickened cylinder (14) and the second thickened cylinder (15) have the same sidewall thickness.

3. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, The sidewall thicknesses of the first thickened cylinder (14) and the second thickened cylinder (15) are different.

4. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, The end of the first thickened cylinder (14) facing away from the second cylinder (12) is connected to the first cylinder (11) by bolts.

5. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, The end of the second thickened cylinder (15) opposite to the second cylinder (12) is connected to the third cylinder (13) by bolts.

6. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, In step S1, the steel ingot is selected from one of the following: 12Cr2Mo1V steel, 16Mn steel, 15CrMo steel, 14Cr1Mo steel, 21 / 4Cr-1Mo-1 / 4V steel, 12Cr2Mo1 steel, 9Cr1MoV steel, 3Cr-1Mo-1 / 4V steel, 20MnMo steel, 20MnNiMo steel, 20MnMoNb steel, SA-765-Ⅱ steel, and SA-508GR.3Cl.1 steel.

7. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, In step S1, the steel ingot is a double-vacuum steel ingot.

8. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, In step S1, the preset temperature is 600°C to 650°C.

9. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, In step S1, the preset time is not less than 10 hours.

10. The forging method for the closing section of the hydrogenation reactor according to claim 1, characterized in that, In step S5, the finished forging is divided by gas cutting.

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