CN115138708A - Preparation method of nickel-based alloy thin-wall pipe - Google Patents
Preparation method of nickel-based alloy thin-wall pipe Download PDFInfo
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- CN115138708A CN115138708A CN202210826814.5A CN202210826814A CN115138708A CN 115138708 A CN115138708 A CN 115138708A CN 202210826814 A CN202210826814 A CN 202210826814A CN 115138708 A CN115138708 A CN 115138708A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract
The invention discloses a preparation method of a nickel-based alloy thin-walled tube, which comprises the following steps: pretreatment: centrifugally casting a thick-wall nickel-based alloy pipe blank, and carrying out hot extrusion to obtain a pipe A; machining: the tube blank is subjected to labor-saving compound extrusion to be machined to obtain a tube B; and (3) heat treatment: obtaining a heat-treated pipe C; surface treatment: finishing and polishing; and (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipe obtained in the step (4) is pickled and cleaned. Different tissues can be obtained through a heat treatment process, the crystal structure is more compact, and the required metallographic structure is obtained, so that the quality of the nickel-based alloy thin-wall pipe is improved through the metal heat treatment process for changing the overall mechanical property; finishing and polishing after finishing and polishing, surface heat treatment to improve surface quality can increase the fatigue resistance and corrosion resistance of the pipe.
Description
Technical Field
The invention relates to the field of nickel-based alloy pipe machining, in particular to a preparation method of a nickel-based alloy thin-wall pipe.
Background
The nickel-based alloy is an alloy with comprehensive properties such as higher strength and certain oxidation and corrosion resistance at the high temperature of 650-1000 ℃. The alloy is further divided into nickel-based heat-resisting alloy, nickel-based corrosion-resisting alloy, nickel-based wear-resisting alloy, nickel-based precision alloy, nickel-based shape memory alloy and the like according to the main properties. The high-temperature alloy is divided into the following components according to different matrixes: iron-based high-temperature alloy, nickel-based high-temperature alloy and cobalt-based high-temperature alloy. Wherein the nickel-based superalloy is referred to as nickel-based alloy for short.
The chromium in the thin-wall pipe reacts with oxygen and an oxidant to generate passivation, and a thin and tough dense passivation film Cr2O3 is formed on the surface of the thin-wall pipe to play a role of corrosion-resistant protective film coating. The thin-walled tube material puts higher requirements on the material quality of the tube material.
The inventor of the application finds that the technology at least has the following technical problems in the process of realizing the nickel-based alloy thin-walled tube:
1. the strength requirement of the thin-wall pipe on the pipe body is high, and the influence of the thickness of the pipe on the final strength requirement is avoided;
2. the thin-walled tube has higher requirements on the appearance and the surface quality of the tube, and the problem that the service life and the structural strength of a product are influenced by poor quality stability is avoided.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of a nickel-based alloy thin-walled tube, wherein a movable roller can be pushed and pulled back and forth manually through an adjusting mechanism to drive a U-shaped conveyor belt to stretch back and forth and move to a larger extent, then a movable column is finely adjusted back and forth through rotating a fine adjustment bolt, so that the adjustment precision of the U-shaped conveyor belt can be more accurately adjusted, the distance between a hopper and the U-shaped conveyor belt can be adjusted through installing a hopper mechanism, the influence of over-dispersed blanking position on powder feeding amount is avoided, the amount of residual raw materials in the hopper can be detected through installing a pressure sensor in the hopper, the addition is convenient and timely, a vibrator is installed in the discharging position of the hopper, the hopper vibrates during blanking, the blanking of the hopper is more uniform, and the phenomena of material blockage or uneven blanking and the like are avoided.
The technical purpose of the invention is realized by the following technical scheme:
the preparation method of the nickel-based alloy thin-wall pipe comprises the following steps:
1) Pretreatment: centrifugally casting a thick-wall nickel-based alloy pipe blank, machining the alloy pipe blank, preheating the alloy pipe blank to 180-250 ℃, spraying an anti-oxidation glass lubricant, heating to 1150-1280 ℃, preserving heat for 2-3 hours, coating glass lubricating powder, and performing hot extrusion to obtain a pipe material A;
2) Machining: the extrusion speed of the pipe blank labor-saving composite extrusion of the pipe A is 5-7 mm/s, a composite extrusion cylinder or an extrusion rod is adopted for extrusion, machining is carried out to obtain a pipe B, the preheating temperature of the composite extrusion cylinder or the extrusion rod is 500-550 ℃, the extrusion temperature is 1000-1150 ℃, the outer diameter of a spinning pipe blank after machining of the pipe blank is 450-650 mm, the wall thickness is 18-25 mm, and multi-pass powerful thinning spinning is carried out by a three-wheel powerful spinning machine;
3) And (3) heat treatment: the total reduction rate between the intermediate annealing of the semi-finished product intermediate annealing pipe B and the intermediate annealing of the semi-finished product is 55-70%, the pipe C subjected to heat treatment is obtained, the surface quality is improved, the pass reduction rate of multi-pass powerful thinning spinning of the semi-finished product is 28-32%, the feed ratio is 1.8 mm/r-2.3 mm/r, the pass reduction rate of spinning of the finished product and the forced spinning of the pipe of the annealed finished product is 25-28%, the feed ratio is 1.2 mm/r-1.8 mm/r, the annealing temperature of the semi-finished product is 880-950 ℃, the heat preservation time is 1.5-2 hours, the annealing temperature of the finished product is 650-780 ℃, and the heat preservation time is l-2 hours;
4) Surface treatment: after finishing and polishing, the tolerance of the outer diameter of the thin-wall pipe is less than +/-0.5 mm, the tolerance of the wall thickness is less than +/-0.1 mm, and the straightness is less than 4mm/m;
5) And (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipes obtained in the step (4) are pickled and cleaned, the pickling step comprises a plurality of groups of pickling tanks, and the pipes are sequentially immersed in the plurality of pickling tanks when moving, so that oxide skins of the pipes are removed, and finished pipes are obtained.
In conclusion, the invention has the following beneficial effects:
1. the extrusion die, the extrusion container and the extrusion rod of the invention adopt high-temperature alloy, the preheating temperature of the die is about 550 ℃, the temperature reduction of the blank is greatly reduced, the deformation is uniform, the material deformation resistance is small, and the extrusion force is obviously reduced; the large-caliber nickel-based alloy thin-wall pipe processing technology has the advantages of high material utilization rate, low cost and high product added value, is suitable for large-scale production, and has remarkable economic benefit and social benefit;
2. the composite extrusion process of the hollow blank is adopted, the forming is labor-saving, the prepared spinning tube blank has fine and uniform tissue, the tissue uniformity and refined tissue in the processing process can be strictly controlled, the comprehensive performance of the product is improved, different tissues can be obtained through the heat treatment process, the spinning tube blank has a more compact crystal structure, the required metallographic structure is obtained, and the quality of the nickel-based alloy thin-walled tube is improved through the metal heat treatment process for changing the overall mechanical performance;
3. and surface treatment, namely, finishing and polishing the metal casting, performing surface heat treatment to improve the surface quality, so that the fatigue resistance and corrosion resistance of the pipe can be improved, and further performing surface protection processes such as paint spraying and the like after removing scraps and floating embroidery on the surface of the pipe by combining only an acid washing step to further improve the quality of the pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The preparation method of the nickel-based alloy thin-wall pipe comprises the following steps:
1) Pretreatment: centrifugally casting a thick-wall nickel-based alloy pipe blank, machining the alloy pipe blank, preheating to 180 ℃, spraying an anti-oxidation glass lubricant, heating to 1150 ℃, preserving heat for 2 hours, coating glass lubricating powder, and performing hot extrusion to obtain a pipe material A;
2) Machining: the extrusion speed of the pipe blank labor-saving composite extrusion of the pipe A is 5mm/s, a composite extrusion cylinder or an extrusion rod is adopted for extrusion, machining is carried out to obtain a pipe B, the preheating temperature of the composite extrusion cylinder or the extrusion rod is 500 ℃, the extrusion temperature is 1000 ℃, the outer diameter of a spun pipe blank after machining of the pipe blank is 450mm, the wall thickness is 18mm, and multi-pass power thinning spinning is carried out by adopting a three-wheel power precision spinning machine for multi-pass thinning spinning;
3) And (3) heat treatment: the total reduction rate between the intermediate annealing of the semi-finished product intermediate annealing pipe B and the intermediate annealing of the semi-finished product is 55 percent, the pipe C subjected to heat treatment is obtained, the surface quality is improved, the pass reduction rate of multi-pass powerful thinning spinning of the semi-finished product is 28 percent, the feed ratio is 1.8mm/r, the pass reduction rate of spinning of the finished product and the strengthening spinning of the annealed finished product pipe is 25 percent, the feed ratio is 1.2mm/r, the annealing temperature of the semi-finished product is 880 ℃, the heat preservation time is 1.5 hours, the annealing temperature of the finished product is 650 ℃, and the heat preservation time is l hours;
4) Surface treatment: after finishing and polishing, the tolerance of the outer diameter of the thin-wall pipe is less than +/-0.5 mm, the tolerance of the wall thickness is less than +/-0.1 mm, and the straightness is less than 4mm/m;
5) And (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipes obtained in the step (4) are pickled and cleaned, the pickling step comprises a plurality of groups of pickling tanks, and the pipes are sequentially immersed in the plurality of pickling tanks when moving, so that oxide skins of the pipes are removed, and finished pipes are obtained.
Example 2
The preparation method of the nickel-based alloy thin-wall pipe comprises the following steps:
1) Pretreatment: centrifugally casting a thick-wall nickel-based alloy pipe blank, machining the alloy pipe blank, preheating the alloy pipe blank to 180-250 ℃, spraying an anti-oxidation glass lubricant, heating to 1280 ℃, preserving heat for 3 hours, coating glass lubricating powder, and performing hot extrusion to obtain a pipe material A;
2) Machining: the extrusion speed of the pipe blank labor-saving composite extrusion of the pipe A is 7mm/s, a composite extrusion cylinder or an extrusion rod is adopted for extrusion, machining is carried out to obtain a pipe B, the preheating temperature of the composite extrusion cylinder or the extrusion rod is 550 ℃, the extrusion temperature is 1150 ℃, the outer diameter of a spinning pipe blank after machining the pipe blank is 650mm, the wall thickness is 25mm, and multi-pass power thinning spinning is carried out by a three-wheel power precision spinning machine for multi-pass thinning spinning;
3) And (3) heat treatment: the total reduction rate between the intermediate annealing of the semi-finished product intermediate annealing pipe B and the intermediate annealing of the semi-finished product is 70%, the pipe C subjected to heat treatment is obtained, the surface quality is improved, the pass reduction rate of multi-pass powerful thinning spinning of the semi-finished product is 32%, the feed ratio is 2.3mm/r, the pass reduction rate of spinning of the finished product and the strengthening spinning of the annealed finished product pipe is 28%, the feed ratio is 1.8mm/r, the annealing temperature of the semi-finished product is 950 ℃, the heat preservation time is 2 hours, the annealing temperature of the finished product is 780 ℃, and the heat preservation time is 2 hours;
4) Surface treatment: after finishing and polishing, the tolerance of the outer diameter of the thin-wall pipe is less than +/-0.5 mm, the tolerance of the wall thickness is less than +/-0.1 mm, and the straightness is less than 4mm/m;
5) And (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipes obtained in the step (4) are pickled and cleaned, the pickling step comprises a plurality of groups of pickling tanks, and the pipes are sequentially immersed in the plurality of pickling tanks when moving, so that oxide skins of the pipes are removed, and finished pipes are obtained.
Example 3
The preparation method of the nickel-based alloy thin-wall pipe comprises the following steps:
1) Pretreatment: centrifugally casting a thick-wall nickel-based alloy pipe blank, machining the alloy pipe blank, preheating the alloy pipe blank to 210 ℃, spraying an anti-oxidation glass lubricant, heating the alloy pipe blank to 1230 ℃, preserving the heat for 3 hours, coating glass lubricating powder, and performing hot extrusion to obtain a pipe material A;
2) Machining: the extrusion speed of the pipe blank labor-saving composite extrusion of the pipe A is 6mm/s, a composite extrusion cylinder or an extrusion rod is adopted for extrusion, machining is carried out to obtain a pipe B, the preheating temperature of the composite extrusion cylinder or the extrusion rod is 530 ℃, the extrusion temperature is 1080 ℃, the outer diameter of a spinning pipe blank after machining the pipe blank is 550mm, the wall thickness is 21mm, and multi-pass power thinning spinning is carried out by adopting a three-wheel power precision spinning machine for multi-pass thinning spinning;
3) And (3) heat treatment: the total reduction rate between the intermediate annealing of the semi-finished product of the intermediate annealing pipe B is 68 percent, the pipe C subjected to heat treatment is obtained, the surface quality is improved, the pass reduction rate of multi-pass powerful thinning spinning of the semi-finished product is 30 percent, the feed ratio is 2.1mm/r, the pass reduction rate of the finished product spinning and the strengthening spinning of the annealed finished product pipe is 26 percent, the feed ratio is 1.5mm/r, the annealing temperature of the semi-finished product is 920 ℃, the heat preservation time is 1.8 hours, the annealing temperature of the finished product is 720 ℃, the heat preservation time is 2 hours, different tissues can be obtained through the heat treatment process, a more compact crystal structure is obtained, a required metallographic structure is obtained, and the quality of the nickel-based alloy thin-wall pipe is improved through the metal heat treatment process for changing the overall mechanical property of the pipe B;
4) Surface treatment: after finishing and polishing, the tolerance of the outer diameter of the thin-wall pipe is less than +/-0.5 mm, the tolerance of the wall thickness is less than +/-0.1 mm, and the straightness is less than 4mm/m; surface treatment, namely, after finishing and polishing metal castings, performing surface heat treatment to improve the surface quality, so that the fatigue resistance and corrosion resistance of the pipes can be improved, and further performing surface protection processes such as paint spraying and the like after removing scraps and floating embroidery on the surfaces of the pipes by combining only an acid washing step to further improve the quality of the pipes;
5) And (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipe obtained in the step (4) is pickled and cleaned, the pickling step comprises a plurality of groups of pickling tanks, and the pipe is sequentially immersed into the plurality of pickling tanks when moving, so that oxide skin of the pipe is removed, and a finished pipe is obtained.
The specific implementation process comprises the following steps: the extrusion die, the extrusion container and the extrusion rod of the invention adopt high-temperature alloy, the preheating temperature of the die is about 550 ℃, the temperature reduction of the blank is greatly reduced, the deformation is uniform, the material deformation resistance is small, and the extrusion force is obviously reduced; the processing technology of the large-caliber nickel-based alloy thin-walled tube has the advantages of high material utilization rate, low cost and high product added value, is suitable for large-scale production, and has remarkable economic benefit and social benefit.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The preparation method of the nickel-based alloy thin-wall pipe is characterized by comprising the following steps of:
1) Pretreatment: centrifugally casting a thick-wall nickel-based alloy tube blank, machining the alloy tube blank, preheating the tube blank to 180-250 ℃, spraying an anti-oxidation glass lubricant, heating to 1150-1280 ℃, preserving heat for 2-3 hours, coating glass lubricating powder, and carrying out hot extrusion to obtain a tube A;
2) Machining: the extrusion speed of the pipe blank labor-saving composite extrusion of the pipe A is 5-7 mm/s, and a composite extrusion cylinder or an extrusion rod is adopted for extrusion to perform machining to obtain a pipe B;
3) And (3) heat treatment: the total reduction rate between the intermediate annealing of the semi-finished product of the intermediate annealing pipe B is 55-70%, and the pipe C subjected to heat treatment is obtained, so that the surface quality is improved;
4) Surface treatment: after finishing and polishing, the tolerance of the outer diameter of the thin-wall pipe is less than +/-0.5 mm, the tolerance of the wall thickness is less than +/-0.1 mm, and the straightness is less than 4mm/m;
5) And (3) post-treatment: the method comprises the steps of pickling and cleaning, wherein the pipe obtained in the step (4) is pickled and cleaned to obtain a finished pipe.
2. The method for preparing the nickel-based alloy thin-walled tube material according to claim 1, wherein the method comprises the following steps: in the machining step: the preheating temperature of the composite extrusion cylinder or the extrusion rod is 500-550 ℃, and the extrusion temperature is 1000-1150 ℃.
3. The method for preparing the nickel-based alloy thin-walled tube material according to claim 2, wherein the method comprises the following steps: the machining step comprises: the outer diameter of the spinning tube blank after the tube blank is machined is 450 mm-650 mm, and the wall thickness is 18 mm-25 mm.
4. The method for preparing the nickel-based alloy thin-walled tube material according to claim 3, wherein the method comprises the following steps: the machining step comprises: the multi-pass power thinning spinning adopts a three-wheel power precise spinning machine to carry out multi-pass thinning spinning, the pass thinning rate of the semi-finished product is 28-32%, and the feed ratio is 1.8-2.3 mm/r.
5. The method for preparing the nickel-based alloy thin-walled tube material according to claim 1, wherein the method comprises the following steps: the heat treatment step comprises: the annealing temperature of the semi-finished product is 880-950 ℃, and the heat preservation time is 1.5-2 hours.
6. The method for preparing the nickel-based alloy thin-walled tube material according to claim 5, wherein the method comprises the following steps: the heat treatment step comprises: the pass reduction rate of finished product spinning and annealing finished product pipe forced spinning is 25-28%, and the feed ratio is 1.2-1.8 mm/r.
7. The method for preparing the nickel-based alloy thin-walled tube material according to claim 6, wherein the method comprises the following steps: the heat treatment step comprises: the annealing temperature of the finished product is 650-780 ℃ and the heat preservation time is l-2 hours.
8. The method for preparing the nickel-based alloy thin-walled tube material according to claim 1, wherein the method comprises the following steps: the post-treatment step comprises: the pickling step comprises a plurality of groups of pickling tanks, and the pipe is sequentially immersed into the plurality of pickling tanks when moving, so that the oxide skin of the pipe is removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210826814.5A CN115138708A (en) | 2022-07-14 | 2022-07-14 | Preparation method of nickel-based alloy thin-wall pipe |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210826814.5A CN115138708A (en) | 2022-07-14 | 2022-07-14 | Preparation method of nickel-based alloy thin-wall pipe |
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| CN115138708A true CN115138708A (en) | 2022-10-04 |
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| CN202210826814.5A Withdrawn CN115138708A (en) | 2022-07-14 | 2022-07-14 | Preparation method of nickel-based alloy thin-wall pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117102273A (en) * | 2023-10-24 | 2023-11-24 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless pipe and method for improving rotation bending fatigue performance thereof |
-
2022
- 2022-07-14 CN CN202210826814.5A patent/CN115138708A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117102273A (en) * | 2023-10-24 | 2023-11-24 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless pipe and method for improving rotation bending fatigue performance thereof |
| CN117102273B (en) * | 2023-10-24 | 2024-02-02 | 成都先进金属材料产业技术研究院股份有限公司 | Titanium alloy seamless pipe and method for improving rotation bending fatigue performance thereof |
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