Combined forging method of hydrogenation reactor closing-up shell ring

Abstract

The invention provides a combined forging method of a hydrogenation reactor shell ring, and relates to the technical field of forging, the combined forging method adopted by the invention comprises the following steps: upsetting a blank, punching, drawing out a core rod, pre-reaming, drawing out and blanking, closing up and drawing out, and reaming to obtain a finished product, so as to obtain a finished product forge piece; a special closing-in sleeve is adopted in the closing-in drawing-out and chambering finished product forming process, a finished forge piece with a straight section in the middle and two closing-in ends can be obtained through the special closing-in sleeve, the finished forge piece is divided, and then two closing-in shell rings with the same straight section size and the same or different closing-in section inner diameters can be obtained. By the adoption of the method, integrated combined forging of the two shell nosing sections with the same straight section size and the same or different shell nosing section inner diameters can be achieved, the total heating number of the forged two shell nosing sections is reduced, the production period is effectively shortened, and therefore the production efficiency can be remarkably improved, the utilization rate of materials can be greatly increased, and the production cost is reduced. And the production requirements of different specifications of closing shell rings can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forging technology, in particular to a closed-die forging method for a hydrogenation reactor closed-end cylinder segment. BACKGROUND

[0002] In the field of petrochemical industry, the hydrogenation reactor is one of the core equipment, and its performance and quality are directly related to the safety and stability of the entire chemical production process. The closed-end cylinder segment technology of the hydrogenation reactor is a key link in the manufacturing process. The closed-end cylinder segment is mainly composed of a straight cylinder segment and a closed-end segment, and is located at the connection between the reactor cylinder and the skirt or the closure head. It bears the important functions of structural transition and load transmission. In the actual chemical production process, the closed-end cylinder segment needs to withstand complex working conditions of high temperature, high pressure and corrosive medium. Therefore, it has very high requirements for its manufacturing quality and performance. At present, the existing closed-end cylinder segment manufacturing scheme of the hydrogenation reactor mainly adopts closed-end sleeve or closed-end sleeve set for hole expansion forging. This manufacturing scheme has certain advantages, for example, the cylinder segment and the adjacent transition segment can be forged integrally, which preferentially improves the material utilization rate and reduces the number of welds. The reduction of welds helps to improve the strength and sealing performance of the entire structure and reduce the safety hazards caused by weld defects. However, when the existing manufacturing process is used to produce the closed-end cylinder segment, only one closed-end cylinder segment can be produced from one steel ingot, and the production efficiency is low. SUMMARY

[0003] The problem solved by the present application is that when the existing manufacturing process is used to produce the closed-end cylinder segment, only one closed-end cylinder segment can be produced from one steel ingot, and the production efficiency is low.

[0004] To solve the above problems, the present application provides a closed-die forging method for a hydrogenation reactor closed-end cylinder segment, based on a special closed-end sleeve, the special closed-end sleeve comprising a first cylinder, a second cylinder and a third cylinder arranged coaxially and connected in sequence; the inner diameters of the first cylinder, the second cylinder and the third cylinder are the same, the outer diameters of the first cylinder and the third cylinder are the same, the outer diameter of the first cylinder and the third cylinder are smaller than the outer diameter of the second cylinder, a first thickened cylinder is sleeved on the side wall of the first cylinder, the first thickened cylinder is used to reduce the height difference between the side walls of the first cylinder and the second cylinder, a second thickened cylinder is sleeved on the side wall of the third cylinder, the second thickened cylinder is used to reduce the height difference between the side walls of the third cylinder and the second cylinder; The closed-die forging method comprises: Step S1, heat the steel ingot to a preset temperature, keep it for a preset time, cut off the water end ingot body part and the riser, and obtain a blank; Step S2, the blank is sequentially subjected to upsetting, piercing, core rod lengthening, pre-hole expansion and lengthening, and a first pre-formed blank is obtained; Step S3, the first preform is closed and lengthened by using the upper anvil, the lower V anvil and the special closing sleeve to obtain a second preform; Step S4, the second preform is expanded and the finished product is obtained by using the mandrel, the special closing sleeve and the expanding hammer head to expand the hole to obtain the finished product; Step S5, the finished product is segmented to obtain two closed cylinder segments.

[0005] Optionally, the side wall thickness of the first thickened cylinder and the second thickened cylinder is the same.

[0006] Optionally, the side wall thickness of the first thickened cylinder and the second thickened cylinder is different.

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

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

[0009] Optionally, in step S1, the material of the ingot is selected from one of 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 ingot is a double vacuum ingot.

[0011] Optionally, in step S1, the preset temperature is 600-650℃.

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

[0013] Optionally, in step S5, the finished product is segmented by using gas cutting.

[0014] Compared with the related art, the combined forging method adopted in the present invention obtains a finished forging by sequentially performing upsetting, punching, mandrel drawing, pre-expansion, drawing and blanking, closing and drawing, and reaming the finished product on the blank; a special closing sleeve is used in the process of closing, drawing and reaming the finished product, and the special closing sleeve can be used to obtain a finished forging with a straight middle section and closed ends. The finished forging is divided to obtain two closed barrel sections with the same straight section size and the same or different closing section inner diameters. Specifically, the third cylinder of the special closing sleeve is used to form the straight sections of the two closing barrel sections, the first cylinder adjusts the height difference between it and the second cylinder through the first thickening cylinder, and the first cylinder and the first thickening cylinder cooperate to form the closing section of one of the closing barrel sections, the third cylinder adjusts the height difference between it and the second cylinder through the second thickening cylinder, and the third cylinder and the second thickening cylinder cooperate to form the closing section of the other closing barrel section. By adopting the method of the present invention, it is possible to realize the integrated forging of two closing barrel sections with the same straight section size and the same or different closing section inner diameters, reducing the total number of forging fires for the two closing barrel sections from 14 fires (traditional method) to 7 fires, effectively shortening the production cycle, thereby significantly improving production efficiency. Moreover, the present invention adopts the same steel ingot to forge two closing barrel sections, reducing the amount of discarded materials at the nozzle end and riser of the steel ingot, and can greatly improve the utilization rate of materials. In addition, by adopting the method of the present invention, by adopting a first thickening cylinder and a second thickening cylinder of different thicknesses, it is possible to adapt to different closing inner diameter sizes (including different diameters and the same diameter), thereby meeting the production needs of closing barrel sections of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a special closing sleeve in an embodiment of the present invention; Figure 2 This is the main view of the second thickened cylinder; Figure 3 is a side view of the second thickened cylinder; Figure 4 This is a segmented diagram of a reactor during the integrated forging of two closed-end cylinder sections having the same straight section size and the same closed-end inner diameter in one embodiment of the present invention; Figure 5 A schematic structural diagram of a finished forging obtained by integrally forging two closed-end barrel sections having identical straight section dimensions and identical closed-end inner diameters in one embodiment of the present invention; Figure 6 A section diagram of a reactor during the integrated forging of two tapered barrel sections having the same straight section size and different tapered section inner diameters in another embodiment of the present invention; Figure 7 A schematic structural diagram of a finished forging obtained by integrally forging two closed-end barrel sections having the same straight section size and different closed-end inner diameters in another embodiment of the invention; Figure 8 Figure 1 is a schematic view of the finished forging of Example 1; Figure 9 Figure 2 is a schematic view of the elongation blanking of the third intermediate blank of Example 1; Figure 10 Figure 3 is a schematic view of the first preform blank of Example 1; Figure 11 Figure 4 is a schematic view of the first preform blank of Example 1 before closed-die elongation; Figure 12 Figure 5 is a schematic view of the first preform blank of Example 1 after closed-die elongation; Figure 13 Figure 6 is a schematic view of the second preform blank of Example 1 after hole expansion; Figure 14 Figure 7 is a schematic view of the finished product after hole expansion of the second preform blank of Example 1.

[0016] BRIEF DESCRIPTION OF DRAWINGS 1. special closed-die sleeve; 11. first cylinder; 12. second cylinder; 13. third cylinder; 14. first thickened cylinder; 15. second thickened cylinder; 2. left closed-die cylinder segment; 3. gas cutting knife edge segment; 4. right closed-die cylinder segment. DETAILED DESCRIPTION

[0017] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms, and should not be interpreted as being limited to the embodiments described herein, on the contrary, these embodiments are provided in order to more thoroughly and completely understand the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes, and are not intended to limit the scope of protection of the present application.

[0018] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the present application in the specification are only for the purpose of describing the specific embodiments, and are not intended to limit the present application.

[0019] The term "including" and its variations used in this document are open inclusions, that is, "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 other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first" and "second" mentioned in the present invention are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] The embodiment of the present invention provides a method for forging a closing barrel section of a hydrogenation reactor, based on a special closing sleeve 1, such as Figure 1 As shown, the special closing sleeve 1 includes a first cylinder 11, a second cylinder 12 and a third cylinder 13 which are coaxially arranged and connected in sequence; the inner diameters of the first cylinder 11, the second cylinder 12 and the third cylinder 13 are the same, the outer diameters of the first cylinder 11 and the third cylinder 13 are the same, the outer diameters of the first cylinder 11 and the third cylinder 13 are smaller than the outer diameter of the second cylinder 12, and the side wall of the first cylinder 11 is provided with a first thickening cylinder 14, which is used to reduce the The height difference between the side walls of the first cylinder 11 and the second cylinder 12 is defined. The side wall of the third cylinder 13 is sleeved with a second thickening 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, and 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 combined forging method comprises: Step S1, heating the steel ingot to a preset temperature and keeping the temperature for a preset time, then removing the discarded material and riser at the ingot body at the nozzle end to obtain a billet; Step S2, sequentially performing upsetting, punching, mandrel drawing, pre-expansion, and drawing and blanking on the blank to obtain a first preformed blank; Step S3, using an upper flat anvil, a lower V anvil and a special closing sleeve 1 to close and lengthen the first preform blank to obtain a second preform blank; Step S4, using the special closing sleeve 1 and the hole expanding hammer head to cooperate with the second preformed blank to expand the product, to obtain the finished product; Step S5, the finished product is segmented to obtain two closing cylinder segment forgings.

[0021] The closed cylinder segment forging method adopted by the embodiment of the present application, by sequentially performing upsetting, punching, core rod lengthening, pre-expanding, lengthening blanking, closing lengthening and expanding the product, to obtain the finished product; in the process of closing lengthening and expanding the product, a special closing sleeve 1 is used, which can obtain a finished product with a middle straight section and two closed ends. By segmenting the finished product, two straight sections with the same size and closing sections with the same or different inner diameters can be obtained. Specifically, the third cylinder 13 of the special closing sleeve 1 is used to form the straight sections of the two closing cylinder segments, the first thickening cylinder 141 is used to adjust the height difference between the first cylinder 11 and the second cylinder 12, the first cylinder 11 and the first thickening cylinder 14 are used to form the closing section of one of the closing cylinder segments, the third cylinder 13 is used to adjust the height difference between the second cylinder 12 and the second thickening cylinder 15, and the third cylinder 13 and the second thickening cylinder 15 are used to form the closing section of the other closing cylinder segment. By using the method of the present application, the integrated closed cylinder segment forging can be realized, the total forging times of the two closed cylinder segments are reduced from 14 times (traditional method) to 7 times, the production cycle is effectively shortened, and the production efficiency is significantly improved. Moreover, the same steel ingot is used to forge the two closed cylinder segments in the embodiment of the present application, which reduces the amount of scrap material at the steel ingot nozzle end and the riser, and can greatly improve the material utilization rate. In addition, by using the method of the embodiment of the present application, different thicknesses of the first thickening cylinder 14 and the second thickening cylinder 15 can be used to adapt to different closing inner diameters (including different diameters and the same diameter), thereby meeting the production needs of different specifications of the closed cylinder segment.

[0022] Before forging, the reactor needs to be reasonably segmented, the size of the straight section of the cylinder segment at the connection with the transition section or the head is adjusted, the total length of the two closed cylinder segments is less than the length of the special closing sleeve 1 under the condition of avoiding interference with the reactor related pipes and other detection instruments, and the difference between the closing end inner diameter of the finished product and the straight section end inner diameter is less than the single side height difference of the special step sleeve by adjusting the size of the adjacent head, i.e. by increasing the size of the head and reducing the head center distance. By installing the first thickening cylinder 14 and the second thickening cylinder 15 with different thicknesses, the single side height difference is achieved, thereby achieving the purpose of closed cylinder segment forging.

[0023] In some embodiments of the present application, as Figure 1As shown, the first thickening cylinder 14 and the second thickening cylinder 15 have the same structure, and the structure of the second thickening cylinder 15 is taken as an example to introduce the structure of both, as shown in Figure 2 and Figure 3 As shown, the second thickening cylinder 15 is a cylindrical structure with both ends open, and the second thickening cylinder 15 is provided with an annular flange on the inner wall of one end away from the second cylinder 12, the annular flange is provided with uniformly distributed through holes along the axial direction, the second cylinder 12 is provided with threaded holes corresponding to the through holes, and the one end of the second thickening cylinder 15 away from the second cylinder 12 is connected with the third cylinder 13 through bolts. Similarly, the first thickening cylinder 141 is a cylindrical structure with both ends open, and the first thickening cylinder 14 is provided with an annular flange on the inner wall of one end away from the second cylinder 12, the annular flange is provided with uniformly distributed through holes along the axial direction, the second cylinder 12 is provided with threaded holes corresponding to the through holes, and the one end of the first thickening cylinder 14 away from the second cylinder 12 is connected with the first cylinder 11 through bolts.

[0024] When the two-piece straight section size is the same, and the inside diameter of the converging section of the converging cylinder segment is the same, the integration and combined forging is carried out, the segmented diagram is as shown in Figure 4 At this time, the side wall thickness of the first thickening cylinder 14 and the second thickening cylinder 15 is the same, and the finished product forged piece obtained by forging is as shown in Figure 5 The finished product forged piece can be regarded as being composed of a left converging cylinder segment 2, a gas cutting knife section 3 and a right converging cylinder segment 4, and the inside diameter of the converging section of the left converging cylinder segment 2 and the right converging cylinder segment 4 is the same.

[0025] When the two-piece straight section size is the same, and the inside diameter of the converging section of the converging cylinder segment is different, the integration and combined forging is carried out, the segmented diagram is as shown in Figure 6 At this time, the side wall thickness of the first thickening cylinder 14 and the second thickening cylinder 15 is different, and the finished product forged piece obtained by forging is as shown in Figure 7 The finished product forged piece can be regarded as being composed of a left converging cylinder segment 2, a gas cutting knife section 3 and a right converging cylinder segment 4, and the inside diameter of the converging section of the left converging cylinder segment 2 and the right converging cylinder segment 4 is different.

[0026] In some embodiments of the present application, in the step S1, the material of the ingot is selected from one of 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 ingot is a double vacuum ingot.

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

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

[0029] The present application is further described below in conjunction with specific embodiments.

[0030] Embodiment 1 This embodiment is a single set of two-end closed-end cylinder segment forged piece of hydrogenation reactor, one end is a closed-end cylinder segment connected with a head segment (without transition segment), and the other end is a closed-end cylinder segment with a transition segment, the finished forging is as shown in Figure 8 The special closed-end sleeve used has the following specifications: the inner diameter D1 of the special closed-end sleeve is 1250 mm, the outer diameter D2 of the second cylinder is 2450 mm, the length L of the second cylinder is 3100 mm, the outer diameter D3 of the first and third cylinders is 1850 mm, the length L1 of the first and third cylinders is 900 mm, the side wall thickness of the first thickening cylinder is 200 mm, and the side wall thickness of the second thickening cylinder is 100 mm.

[0031] The specific forging process is as follows: A1, the double vacuum ingot is heated to a preset temperature and kept for a preset time, and then the ingot body is cut off by 150 mm at the water hole end and the riser, so as to reduce metallurgical defects such as shrinkage cavity and slag inclusion in the ingot, thereby obtaining a blank; wherein the preset temperature is 625 DEG C, the preset time is 15 hours, and the material of the double vacuum ingot is 12Cr2Mo1V steel.

[0032] A2, the blank is heated to 1270 DEG C and kept for 60 hours, then the blank is upset to a height of 2250 mm and a diameter of 4360 mm, and then punched to obtain a first intermediate blank; the inner diameter of the first intermediate blank is 1400 mm.

[0033] A3, the first intermediate blank is heated to 1260 DEG C and kept for 15 hours, and then the core rod is drawn to obtain a second intermediate blank; the inner diameter of the second intermediate blank is 1380 mm, the outer diameter is 3670 mm, and the length is 3450 mm.

[0034] A4, the second intermediate blank is heated to 1260 DEG C and kept for 15 hours, and then pre-bored by a mandrel to obtain a third intermediate blank; the inner diameter of the third intermediate blank is 2500 mm, the outer diameter is 4200 mm, and the length is 3450 mm.

[0035] A5, as Figure 9As shown, the third intermediate blank is heated to 1260℃ for 15h, and then elongated and cut off by using an upper flat anvil, a lower V anvil, a horse lever and a round sleeve to obtain a first preformed blank; as shown, Figure 10 As shown, the first preformed blank is a stepped cylinder with flanges at both ends, and the size of the first preformed blank is as shown, Figure 10 It should be noted that, Figure 9 In the figure, A represents the upper flat anvil, B represents the lower V anvil, C represents the third intermediate blank, and D represents the round sleeve.

[0036] A6, the first preformed blank is heated to 1260℃ for 12h, and then elongated and cut off by using an upper flat anvil, a lower V anvil and a special closing sleeve to make the outer diameters of both ends of the blank the same as that of the middle section, and make the inner wall of the blank fit the special closing sleeve, to obtain a second preformed blank, as shown, Figure 11 As shown, the first preformed blank is a stepped cylinder with flanges at both ends, and the size of the first preformed blank is as shown, Figure 12 Specifically, the upper flat anvil and the lower V anvil are used to flatten the flange protrusions at both ends of the first preformed blank, so that the outer diameters of the side walls of the blank are consistent; during the elongation and closing process, the special closing sleeve penetrates into the inner cavity of the blank as a forming die for the inner wall of the second preformed blank. It should be noted that, Figure 11 In the figure, A represents the upper flat anvil, B represents the lower V anvil, and E represents the first preformed blank. Figure 12 In the figure, F represents the second preformed blank.

[0037] A7, the second preformed blank is heated to 1260℃ for 9h, and then elongated and cut off by using a horse lever, the special closing sleeve and an expanding hammer head to obtain a finished forging, as shown, Figure 13 and Figure 14 As shown, the special closing sleeve penetrates into the inner cavity of the blank during the expansion and finished product cutting process; Figure 13 and Figure 14 As shown, the special closing sleeve penetrates into the inner cavity of the blank during the expansion and finished product cutting process; Figure 13 and Figure 14 In the figure, G represents the expanding hammer head, H represents the horse lever, Figure 14 In the figure, I represents the finished forging.

[0038] A8, the finished forging is marked with a cutting knife, and then cut to obtain two closed cylinder segments.

[0039] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A method for forging a hydrogenation reactor end-joint, based on a special end-joint sleeve (1), characterized in that: The special closing sleeve (1) comprises a first cylinder (11), a second cylinder (12) and a third cylinder (13) which are coaxially arranged and connected in sequence; the inner diameters of the first cylinder (11), the second cylinder (12) and the third cylinder (13) are the same, the outer diameters of the first cylinder (11) and the third cylinder (13) are the same, 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); the side wall of the first cylinder (11) is provided with a first thickening cylinder (14), and the first thickening 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 provided with a second thickening cylinder (15), and the second thickening cylinder (15) is used to reduce the height difference between the side walls of the third cylinder (13) and the second cylinder (12); The combined forging method comprises: Step S1, heating the steel ingot to a preset temperature and keeping the temperature for a preset time, then removing the discarded material and riser at the ingot body at the nozzle end to obtain a billet; Step S2, sequentially performing upsetting, punching, mandrel drawing, pre-expansion, and drawing and blanking on the blank to obtain a first preformed blank; Step S3, using an upper flat anvil, a lower V anvil and the special closing sleeve (1) to close and lengthen the first preform blank to obtain a second preform blank; Step S4, using a horse bar, the special closing sleeve (1) and a reaming hammer to reame the second preform blank into a finished product, thereby obtaining a finished forging; Step S5: split the finished forging to obtain two closed-end barrel section forgings.

2. The method for forging a closing barrel section of a hydrogenation reactor according to claim 1, characterized in that: The side wall thickness of the first thickened cylinder (14) and the second thickened cylinder (15) are the same.

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

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

5. The method for forging a closing barrel section of a hydrogenation reactor according to claim 1, characterized in that: One end of the second thickened cylinder (15) facing away from the second cylinder (12) is connected to the third cylinder (13) via a bolt.

6. The method for forging a closing barrel section of a hydrogenation reactor according to claim 1, characterized in that: In step S1, the material of the steel ingot is selected from one of 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 method for forging a closing barrel section of a hydrogenation reactor according to claim 1, characterized in that: In the step S1, the steel ingot is a double vacuum steel ingot.

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

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

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

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