CN117181972B - A method for preparing a large-size high-temperature alloy long-neck flange pipe - Google Patents
A method for preparing a large-size high-temperature alloy long-neck flange pipe Download PDFInfo
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- CN117181972B CN117181972B CN202311092379.9A CN202311092379A CN117181972B CN 117181972 B CN117181972 B CN 117181972B CN 202311092379 A CN202311092379 A CN 202311092379A CN 117181972 B CN117181972 B CN 117181972B
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Abstract
The invention discloses a preparation method of a large-specification high-temperature alloy long-neck flange pipe, which comprises the following steps: 1) Firstly, coating a high-temperature alloy hollow ingot blank by adopting stainless steel, heating the ingot blank, then performing extrusion treatment once, and reserving a pressing part with a set length during the extrusion treatment once to obtain a long neck step tube blank; 2) Heating the long-neck step tube blank, replacing a large-specification extrusion cylinder and a special die, and then performing secondary extrusion upsetting treatment on the reserved pressing part of primary extrusion to obtain a long-neck flange tube blank; 3) Sequentially carrying out heat treatment and machining on the long-neck flange tube blank to obtain a target product; and simultaneously controlling parameters such as temperature, extrusion speed, extrusion ratio, extrusion force and the like in each step. The invention adopts a twice hot extrusion process, can prepare the large-specification high-temperature alloy long-neck flange pipe by utilizing smaller extrusion force of the existing equipment, obviously improves the deformation of the flange, and improves the structural uniformity and mechanical property of the flange.
Description
Technical Field
The invention belongs to the technical field of high-temperature alloy pipe processing, and particularly relates to a preparation method of a large-specification high-temperature alloy long-neck flange pipe.
Background
The high-temperature alloy, also called as heat-resistant alloy or superalloy, is an alloy material which takes iron, nickel and cobalt as reference materials, can show better oxidation resistance, corrosion resistance and creep resistance under the condition of high temperature of 600-1200 ℃, has good fatigue performance and can work for a long time under certain stress load condition.
The long-neck flange pipe is characterized in that one end of the flange plate is provided with a long pipe, the long-neck flange pipe can be regarded as a combination body of the flange plate and a pipe fitting, as shown in fig. 1, and the long-neck flange pipe manufactured by high-temperature alloy is mainly used for pipeline connection in high-temperature and high-pressure environments, such as nuclear power, chemical industry, petroleum, natural gas and other industries, is generally integrally formed in a forging or ring rolling mode in order to avoid stress corrosion or creep failure caused by stress concentration due to severe service conditions. However, since the high-temperature alloy has a small processing temperature range at a high temperature, and the temperature is reduced to possibly cause cracking and other defects, the length of the flanged pipe fitting manufactured by forging or ring rolling is limited, the length of the pipe fitting is generally less than 1000mm, the whole connecting point of the conveying pipeline is too many (flange plates can be arranged at two ends in actual connection, and fig. 1 is only an example), if the high-temperature and high-pressure medium is conveyed, each connecting point must be specially treated, so that the relatively short flanged pipe not only greatly improves the construction cost of the conveying pipeline, but also influences the laying efficiency of the conveying pipeline.
In view of the above, the present inventors have proposed a method for manufacturing a large-sized superalloy long neck flange pipe, so as to overcome the drawbacks of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a preparation method of a large-specification high-temperature alloy long-neck flange pipe.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The invention provides a preparation method of a large-specification high-temperature alloy long-neck flange pipe, which comprises the following steps:
firstly, cladding a high-temperature alloy hollow ingot blank by adopting stainless steel, heating the clad high-temperature alloy hollow ingot blank, then loading the heated high-temperature alloy hollow ingot blank into an extrusion die to carry out extrusion treatment for one time, and reserving a pressing residual part with a set length during the extrusion treatment for one time to obtain a long neck step tube blank;
Step two, performing heating treatment on the long-neck step tube blank obtained in the step one, replacing a large-size extrusion cylinder and an extrusion die, and performing secondary extrusion upsetting treatment on the reserved pressing part of primary extrusion to obtain a long-neck flange tube blank;
Thirdly, performing heat treatment on the long neck flange tube blank obtained in the second step;
and step four, machining the long-neck flange tube blank subjected to the heat treatment in the step three to obtain the high-temperature alloy long-neck flange tube with the target size.
Further, the thickness of the stainless steel coating the high-temperature alloy hollow ingot blank in the first step is 2-5 mm, and the inner surface, the outer surface and the end surface of the high-temperature alloy hollow ingot blank are fully coated by the stainless steel during coating.
Further, in the first step, when the coated high-temperature alloy hollow ingot blank is heated, the heating mode adopted is induction heating or resistance furnace heating;
When induction heating is adopted, the heating temperature is set to 1000-1200 ℃, and the heat preservation time is 2-5 min;
When the resistance furnace is used for heating, a heat preservation platform is arranged at 700-900 ℃, then the temperature is raised to 1000-1200 ℃ and the heat preservation time is 1-3 h.
In the first step, glass powder is used as a lubricant when the high-temperature alloy hollow ingot blank is extruded for one time, and a steel pad with the temperature of more than 900 ℃ is placed at the tail part of the high-temperature alloy hollow ingot blank for reducing the temperature drop of the high-temperature alloy hollow ingot blank.
Further, in the first step, when the high-temperature alloy hollow ingot blank is extruded for one time, the extrusion parameters are set as follows: the extrusion ratio is 3-10, the extrusion speed is 50-150 mm/s, and the length of the reserved excess part is 50-200 mm during extrusion.
Further, in the second step, when the long-neck stepped tube blank is heated, the whole long-neck stepped tube is heated or only the reserved pressing part is heated, and the heating temperature is less than or equal to the heating temperature in the first step.
Further, the inner diameter of the extrusion cylinder adopted in the second step is 5-20 mm larger than the diameter of the target flange, the length of the extrusion residual part is 5-10 mm larger than the thickness of the target flange, the secondary extrusion upsetting ratio is controlled to be 2-4, and the extrusion speed is set to be 5-30 mm/s.
Further, the heat treatment mode in the third step is annealing and aging, the specific annealing temperature is 700-900 ℃, and the heat preservation is carried out for 2-3 hours.
And in the fourth step, the single-side removing allowance of the long-neck flange tube blank is 2-10 mm.
Further, the preparation method is used for preparing the high-temperature alloy long-neck flange pipe with the flange diameter of 195-780 mm, the pipe diameter of 56-290 mm and the pipe length of 1000-3000 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the preparation method provided by the invention, the step tube blank is prepared in the smaller extrusion barrel by adopting the extruder, then the large extrusion barrel is replaced to upsett to finish the preparation of the flange, the characteristic of smaller extrusion force in the extrusion filling (upsetting) stage is fully utilized, and the preparation of the large-specification high-temperature alloy long-neck flange tube is realized on conventional extrusion equipment. The high-temperature alloy has extremely high strength during hot extrusion, is limited by extrusion force, and cannot be directly used for preparing a pipe with large extrusion ratio, for example, when the diameter of a flange plate is 300mm, the diameter of a pipe fitting is 100mm, and the wall thickness is 10mm, if a direct extrusion method is adopted, an extrusion cylinder with the inner diameter being larger than 300mm is needed, the extrusion ratio is larger than 23, and the theoretical extrusion force is about 50MN; the extrusion force of a 300mm internal diameter extrusion barrel configuration is typically 40MN (i.e., less than 50 MN) limited by the allowable stress of the extrusion shaft, and therefore is insufficient to deform the superalloy. The invention firstly obtains the long-necked step tube blank through the first extrusion, then performs extrusion upsetting on the flange side through the second extrusion, thereby obviously improving the deformation of the flange and improving the structural uniformity and mechanical property of the flange.
2. According to the preparation method provided by the invention, the inner surface and the outer surface and the end parts of the high-temperature alloy tube blank are all coated with the stainless steel layers, so that when the high-temperature alloy tube blank is heated and then extruded for one time, the stainless steel can be utilized to have good ductility and lubricity at high temperature, the high-temperature alloy and the extrusion die are isolated, and the surface quality of the long-neck step tube blank obtained after extrusion is ensured; then heating the long-neck step tube blank, replacing a large-specification extrusion cylinder and an extrusion die, and performing secondary extrusion upsetting treatment on the reserved pressing part of primary extrusion to obtain a long-neck flange tube blank; and finally, sequentially carrying out heat treatment and machining on the long neck flange tube blank to obtain a target product. Compared with the prior art, the preparation method can obtain the high-temperature alloy long-neck flange pipe with the flange diameter of 195-780 mm, the pipe diameter of 56-290 mm and the pipe length of 1000-3000 mm, thereby reducing the connection points when constructing high-temperature and high-pressure conveying pipelines, reducing the construction cost of the conveying pipelines and improving the laying efficiency of the conveying pipelines.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate principles of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a long neck flange pipe structure;
FIG. 2 is a flow chart of the preparation method of the invention;
FIG. 3 is a schematic diagram of the structure of the preparation method of the present invention before one extrusion;
FIG. 4 is a schematic diagram of the structure of the preparation method of the present invention after one extrusion;
FIG. 5 is a schematic illustration of the process of the present invention prior to secondary extrusion upsetting;
FIG. 6 is a schematic illustration of the process of the present invention after a second extrusion upset.
Wherein: 1 is an extrusion shaft; 2 is an extrusion cylinder; 3 is an extrusion pad; 4 is a steel pad; 5 is a high-temperature alloy tube blank; 6 is an extrusion die; 7 is a die pad; 8 is an extrusion needle; and 9 is a die sleeve.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are not intended to represent all embodiments consistent with the invention. Rather, they are merely examples of devices that are consistent with aspects of the invention that are set forth in the following claims.
Referring to fig. 2 to 6, the present invention provides a method for preparing a large-sized superalloy long neck flange pipe, which comprises the following steps:
Firstly, cladding a high-temperature alloy hollow ingot blank by adopting stainless steel, heating the clad high-temperature alloy hollow ingot blank, then loading the heated high-temperature alloy hollow ingot blank into an extrusion die for extrusion once, and reserving a pressing residual part with a set length during the extrusion once to obtain a long neck step tube blank;
specifically, stainless steel with the thickness of 2-5 mm is adopted to fully cover the inner surface, the outer surface and the end face of the high-temperature alloy hollow ingot blank.
Then heating the coated high-temperature alloy hollow ingot blank by adopting an induction heating mode or a resistance furnace heating mode, and setting the heating temperature to be 1000-1200 ℃ and keeping the temperature for 2-5 min when adopting induction heating; when the resistance furnace is used for heating, a heat preservation platform is arranged at 700-900 ℃, then the temperature is raised to 1000-1200 ℃ and the heat preservation time is 1-3 h.
Finally, the heated high-temperature alloy hollow ingot blank coated with the stainless steel is put into an extrusion die, as shown in figure 2, glass powder is adopted as a lubricant at the same time, and a steel pad with the temperature of more than 900 ℃ is placed at the tail part of the high-temperature alloy hollow ingot blank; then, the high-temperature alloy hollow ingot blank is extruded for the first time, and extrusion parameters set during the first extrusion are as follows: the extrusion ratio is 3-10, the extrusion speed is 50-150 mm/s, the length of the reserved excess part is 50-200 mm during extrusion, and the extrusion treatment is shown in figure 4.
The high-temperature steel pad is placed at the tail of the hollow ingot blank, so that the temperature drop of the high-temperature alloy can be reduced, the high-temperature alloy has high strength at high temperature, the extrusion deformation resistance is reduced by adopting a smaller extrusion ratio, the risk of cracking or generating surface grooves of a product is reduced, the hollow ingot blank with the length of 50-200 mm is reserved and is not extruded, and the step-shaped tube blank can be prepared, namely the long-neck step tube blank is obtained.
Step two, performing heating treatment on the long-neck step tube blank obtained in the step one, replacing a large-size extrusion cylinder and an extrusion die, and performing secondary extrusion upsetting treatment on the reserved pressing part of primary extrusion to obtain a long-neck flange tube blank;
specifically, the heating step can heat only the reserved pressing part, and can heat the whole long neck step tube blank, and the heating temperature is less than or equal to the heating temperature in the first step, because the proper reduction of the heating temperature is favorable for reducing the precipitation of the compound, and the abnormal growth of crystal grains can be avoided. And (3) loading the long neck step tube blank into a special die after heating, as shown in fig. 5, and then performing secondary extrusion upsetting on the long neck step tube blank, as shown in fig. 6, to obtain the long neck flange tube blank.
Wherein, the inner diameter of the extrusion cylinder which is replaced during the secondary extrusion upsetting treatment is 5 mm-20 mm larger than the diameter of the target flange, the length of the extrusion residual part is 5 mm-10 mm larger than the thickness of the target flange, the secondary extrusion upsetting ratio is controlled to be 2-4, and the extrusion speed is set to be 5 mm/s-30 mm/s. The inner diameter of the extrusion cylinder and the extrusion surplus set value can ensure that a qualified flange can be processed, and the utilization rate of high-temperature alloy materials can be improved; meanwhile, reasonable extrusion ratio is set, so that the flange plate part can be fully deformed, and obvious defects generated during upsetting are avoided; and the extrusion speed is low-speed extrusion, so that the extrusion residual thickness can be accurately controlled.
Thirdly, performing heat treatment on the long neck flange tube blank obtained in the second step;
the specific heat treatment mode is annealing and aging, the specific process is determined according to the material and the application of the product, the annealing temperature is generally set to 700-900 ℃, and the heat is preserved for 2-3 hours.
And step four, machining the long-neck flange tube blank subjected to the heat treatment in the step three to obtain a high-temperature alloy long-neck flange tube with a target size, wherein the single-side removing allowance of the long-neck flange tube blank in the specific machining is 2-10 mm.
To further illustrate the efficacy of the preparation method of the present invention, the inventors performed the following specific examples:
Example 1 (preparation of a Long neck Flange pipe having a specification of # 56×6X100 mm pipe and a flange having a specification of # 195×30 mm)
The preparation method of the embodiment comprises the following steps:
1) The high-temperature alloy material is GH4720, a whole high-temperature alloy hollow ingot blank is coated by a stainless steel with the thickness of 304 mm, and the specification of the coated high-temperature alloy hollow ingot blank is phi Outer part 117×Ф Inner part multiplied by 320mm; heating the coated high-temperature alloy tube blank by adopting a resistance furnace, charging the tube blank to 700 ℃, preserving heat for 1h, and then heating to 1150 ℃ and preserving heat for 1.5-2.5 h; and after the heat preservation is finished, rapidly transferring the blank to an extruder to perform first extrusion, wherein glass powder is used as a lubricant during extrusion, a steel pad with the temperature of 950 ℃ is placed at the tail part of a high-temperature alloy hollow ingot blank, the inner diameter of an extrusion cylinder is 120mm, the extrusion ratio is 6, the extrusion speed is 50mm/s, the extrusion pressure surplus set length is 120mm, namely, the hollow ingot blank with the reserved length of 120mm is not extruded, the peak extrusion force is measured to be 14MN, and a long-neck step tube blank is obtained after the first extrusion, wherein the specification of a tube fitting in the long-neck step tube blank is phi 60 multiplied by 10 multiplied by 1000mm.
2) When in secondary extrusion upsetting, a resistance heating furnace is adopted to heat the long neck step tube blank obtained in the step 1) to 1130 ℃, and the heat is preserved for 1 to 1.5 hours; and replacing an extrusion cylinder with an inner diameter of 200mm and a corresponding extrusion die, placing a steel pad with a temperature of 950 ℃ at the tail part of the long-neck step pipe blank, setting the residual thickness of the steel pad to be 40mm, the extrusion upsetting ratio to be 3, setting the extrusion speed to be 5mm/s, measuring the upsetting force to be 9MN, and obtaining the long-neck flange pipe blank after extrusion upsetting.
3) Annealing the long-neck flange tube blank obtained in the step 2), wherein the annealing condition is that the heat is preserved for 2 hours at 700 ℃; and cooling to room temperature after annealing, and carrying out machining, wherein the single side of the inner surface and the outer surface is removed by 2mm, so that the finished product of the pipe fitting phi 56 multiplied by 6 multiplied by 1000mm and the flange plate phi 195 multiplied by 30mm is obtained.
Example 2 (preparation of a Long neck Flange pipe having a specification of # 176×16×2000mm pipe fitting and a flange having a specification of # 340×30 mm)
The preparation method of the embodiment comprises the following steps:
1) The high-temperature alloy material is GH4169, a whole high-temperature alloy hollow ingot blank is coated by a stainless steel with the thickness of 2mm 304, and the specification of the coated high-temperature alloy hollow ingot blank is phi Outer part 252×Ф Inner part multiplied by 740mm; heating the coated high-temperature alloy tube blank by adopting an induction mode, and preserving heat for 5min after heating to 1100 ℃; and after the heat preservation is finished, rapidly transferring the mixture to an extruder for first extrusion, wherein glass powder is used as a lubricant during extrusion, a steel pad with the temperature of 950 ℃ is placed at the tail part of a high-temperature alloy hollow ingot blank, the inner diameter of an extrusion cylinder is 260mm, the extrusion ratio is 3.6, the extrusion speed is 100mm/s, the extrusion pressure surplus set length is 90mm, namely, the hollow ingot blank with the reserved length of 90mm is not extruded, the peak extrusion force is 42MN in actual measurement, and a long-neck step tube blank is obtained after the first extrusion, wherein the specification of a tube fitting in the long-neck step tube blank is phi 180 multiplied by 20 multiplied by 2000mm.
2) Heating the long neck step tube blank obtained in the step 1) to 1100 ℃ by adopting an induction heating mode during secondary extrusion upsetting, and preserving heat for 5min; and replacing an extrusion cylinder with the inner diameter of 350mm and a corresponding extrusion die, placing a steel pad with the temperature of 950 ℃ at the tail part of the long-neck step pipe blank, setting the residual thickness of 40mm, the extrusion upsetting ratio of 2.2, the extrusion speed of 10mm/s, the actual measurement upsetting force of 23MN, and obtaining the long-neck flange pipe blank after extrusion upsetting.
3) Annealing the long-neck flange tube blank obtained in the step 2), wherein the annealing condition is that the heat is preserved for 2.5 hours at 800 ℃; and cooling to room temperature after annealing, and carrying out machining, wherein the single side of the inner surface and the outer surface is removed by 2mm, so that the finished product of the pipe fitting phi 176 multiplied by 16 multiplied by 1000mm and the flange plate phi 340 multiplied by 30mm is obtained.
Example 3 (preparation of a Long neck Flange pipe with the specification of # -290 x 20 x 1000mm pipe and a flange with the specification of # -780 x 30 mm)
The preparation method of the embodiment comprises the following steps:
1) The high-temperature alloy material is N06690, a whole high-temperature alloy hollow ingot blank is coated by a stainless steel with the thickness of 304 mm, and the specification of the coated high-temperature alloy hollow ingot blank is phi Outer part 440×Ф Inner part 243 multiplied by 920mm; heating the coated high-temperature alloy hollow ingot blank by adopting a resistance furnace, charging the ingot blank to 800 ℃ for heat preservation for 2 hours, and then heating to 1200 ℃ for 3.0-5.0 hours; and after the heat preservation is finished, rapidly transferring the mixture to an extruder to perform first extrusion, wherein glass powder is used as a lubricant during extrusion, a steel pad with the temperature of 950 ℃ is placed at the tail part of the high-temperature alloy tube blank, the inner diameter of an extrusion cylinder is 450mm, the extrusion ratio is 4.4, the extrusion speed is 150mm/s, the extrusion pressure surplus set length is 160mm, namely, a hollow ingot blank with the reserved length of 160mm is not extruded, the peak extrusion force is measured for 60MN, and a long-neck step tube blank is obtained after the first extrusion, wherein the specification of a tube fitting in the long-neck step tube blank is phi 300 multiplied by 30 multiplied by 3000mm.
2) When the secondary extrusion upsetting is carried out, a resistance heating furnace is adopted to heat the long neck step tube blank obtained in the step 1) to 1160 ℃ for 2-3 h; and replacing an extrusion cylinder with an inner diameter of 800mm and a corresponding extrusion die, placing a steel pad with a temperature of 950 ℃ at the tail part of the long-neck step pipe blank, setting the residual thickness of 40mm, the extrusion upsetting ratio of 4, the extrusion speed of 30mm/s, the actual measurement upsetting force of 35MN, and obtaining the long-neck flange pipe blank after extrusion upsetting.
3) Annealing the long-neck flange tube blank obtained in the step 2), wherein the annealing condition is that the heat is preserved for 3 hours at 900 ℃; and cooling to room temperature after annealing, and carrying out machining, wherein the single side removal amount of the inner surface and the outer surface is 5mm, so that the finished product of the pipe fitting with the diameter of phi 290 multiplied by 20 multiplied by 3000mm and the flange with the diameter of phi 780 multiplied by 30mm is obtained.
Tables 1 and 2 below show the comparison of the primary and secondary extrusion upsetting process parameters in examples 1 to 3:
table 1 comparison of parameters of the primary extrusion process
TABLE 2 comparison of parameters of the Secondary extrusion upsetting Process
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It will be understood that the invention is not limited to what has been described above and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. The preparation method of the large-specification high-temperature alloy long-neck flange pipe is characterized by comprising the following steps of:
Firstly, cladding a high-temperature alloy hollow ingot blank by adopting stainless steel, heating the clad high-temperature alloy hollow ingot blank, then loading the heated high-temperature alloy hollow ingot blank into an extrusion die for extrusion once, and reserving a pressing residual part with a set length during the extrusion once to obtain a long neck step tube blank;
Step two, performing heating treatment on the long-neck step tube blank obtained in the step one, replacing a large-size extrusion cylinder and an extrusion die, and performing secondary extrusion upsetting treatment on the reserved pressing part of primary extrusion to obtain a long-neck flange tube blank;
Thirdly, performing heat treatment on the long neck flange tube blank obtained in the second step;
Fourthly, machining the long-neck flange tube blank subjected to the heat treatment in the third step to obtain a high-temperature alloy long-neck flange tube with a target size;
The method comprises the steps of firstly, coating a stainless steel thickness of a high-temperature alloy hollow ingot blank to be 2-5 mm, and fully coating the inner surface, the outer surface and the end surface of the high-temperature alloy hollow ingot blank when the stainless steel is coated; when the coated high-temperature alloy hollow ingot blank is extruded for one time: a steel pad with the temperature of more than 900 ℃ is placed at the tail part of the high-temperature alloy hollow ingot blank, and the set extrusion parameters are as follows: the extrusion ratio is 3-10, the extrusion speed is 50-150 mm/s, and the length of the reserved excess part is 50-200 mm during extrusion;
The inner diameter of the extrusion cylinder adopted in the second step is 5-20 mm larger than the diameter of the target flange, the length of the extrusion residual part is 5-10mm larger than the thickness of the target flange, the secondary extrusion upsetting ratio is controlled to be 2-4, and the extrusion speed is set to be 5-30 mm/s.
2. The method for preparing a large-size high-temperature alloy long-neck flange pipe according to claim 1, wherein in the first step, when the coated high-temperature alloy hollow ingot blank is heated, the heating mode is induction heating or resistance furnace heating;
When induction heating is adopted, the heating temperature is set to 1000-1200 ℃, and the heat preservation time is 2-5 min;
when the resistance furnace is used for heating, a heat preservation platform is arranged at 700-900 ℃, then the temperature is raised to 1000-1200 ℃ and the heat preservation time is 1-5 h.
3. The method for manufacturing a large-sized superalloy long neck flange pipe according to claim 1, wherein in the first step, glass powder is used as a lubricant during one extrusion treatment of the superalloy hollow ingot.
4. The method for manufacturing a large-sized superalloy long neck flange pipe according to claim 1, wherein in the second step, when the long neck step pipe blank is heated, the entire long neck step pipe is heated or only the reserved remainder is heated, and the heating temperature is equal to or lower than the heating temperature in the first step.
5. The method for preparing a large-size high-temperature alloy long-neck flange pipe according to claim 1, wherein the heat treatment mode in the third step is annealing and aging, the specific annealing temperature is 700-900 ℃, and the heat preservation is carried out for 2-3 hours.
6. The method for preparing the large-size high-temperature alloy long-neck flange pipe according to claim 1, wherein the single-side removing allowance of the long-neck flange pipe blank in the machining in the fourth step is 2-10 mm.
7. The method for manufacturing a large-sized superalloy long neck flange pipe according to any of claims 1 to 6, wherein the manufacturing method is used for manufacturing a superalloy long neck flange pipe with a flange diameter of 195mm to 780mm, a pipe diameter of 56mm to 290mm and a pipe length of 1000mm to 3000 mm.
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| DE4211172A1 (en) * | 1992-04-03 | 1993-10-07 | Hildebrandt Spulen Bobbins Gmb | Bobbin and method for its manufacture |
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| US20150367681A1 (en) * | 2014-06-18 | 2015-12-24 | American Axle & Manufacturing, Inc. | Hollow axle shaft for a vehicle and a method of manufacturing the same |
| CN105033132B (en) * | 2015-09-19 | 2017-06-23 | 中国第一重型机械股份公司 | A kind of main pipeline hollow forging profiling forging method with the asymmetric pipe nozzle of overlength |
| KR20180029300A (en) * | 2016-09-12 | 2018-03-21 | (주) 호창엠에프 | Method for manufacturing long hollow type drive shaft through cold forging precess |
| CN108747225A (en) * | 2018-06-28 | 2018-11-06 | 江阴市天柠管道有限公司 | A kind of moulding process of welding neck flange |
| CN219483795U (en) * | 2023-03-03 | 2023-08-08 | 天津重型装备工程研究有限公司 | Large extruder for extruding large-size nickel-based alloy bars |
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| CN102327919A (en) * | 2011-09-29 | 2012-01-25 | 西北工业大学 | Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe |
| CN104175066A (en) * | 2014-07-07 | 2014-12-03 | 西安交通大学 | Axial pushing-in gathering and upsetting composite process of ultralong pipe head flange |
| CN104476128A (en) * | 2014-11-21 | 2015-04-01 | 西安邦信特种金属材料科技有限公司 | Method of manufacturing high-temperature alloy pipe blanks |
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