CN112322919A - Production process of aluminum alloy seamless pipe for aerospace - Google Patents
Production process of aluminum alloy seamless pipe for aerospace Download PDFInfo
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- CN112322919A CN112322919A CN202011261796.8A CN202011261796A CN112322919A CN 112322919 A CN112322919 A CN 112322919A CN 202011261796 A CN202011261796 A CN 202011261796A CN 112322919 A CN112322919 A CN 112322919A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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- Crystallography & Structural Chemistry (AREA)
- Extrusion Of Metal (AREA)
Abstract
The invention provides a production process of an aluminum alloy seamless pipe for aerospace, which relates to the technical field of aluminum alloy production, and comprises the following components in percentage by weight: zn8.0-8.5%, Mg2.5-2.8%, Cu2.0-2.3%, Zr0.1-0.15%, Be0.002%, Fe0.25%, Si0.08%, Mn0.05%, Cr0.02%, Ti0.03%, and the balance of Al. The production process of the aluminum alloy seamless pipe for aerospace comprises the steps of S1 smelting, S2 refining alloy melt, S3 homogenization heat treatment, S4 extruding and S5 heat treatment. The seamless pipe produced by the production process of the aluminum alloy seamless pipe for aerospace use has high strength, good corrosion resistance, no surface crack, no casting defects such as crack, air hole, oxide film, looseness and the like in a macrostructure, and no coarse recrystallized structure and overburning of a microstructure, thereby meeting the production requirement.
Description
Technical Field
The invention relates to the technical field of aluminum alloy processing, in particular to a production process of an aluminum alloy seamless pipe for aerospace.
Background
With the continuous improvement of various performances of Al-Zn-Mg-Cu aluminum alloys, the application range of high-strength and high-toughness aluminum alloys is more and more extensive, the Al-Zn-Mg-Cu aluminum alloys can be processed into various shapes, such as plates, sections, pipes and the like, and are more applied in the field of aerospace, and the quality of the aluminum alloys directly influences the flight safety of airplanes, so that the quality requirement of the aluminum alloys is higher, the surface of the aluminum alloy seamless pipes is not allowed to have defects such as cracks, corrosion and the like, casting defects such as cracks, tail shrinkage, pores, oxidation films, looseness and the like are not allowed in low-magnification structures of the pipes, the microstructure of the pipes after heat treatment should keep the extrusion deformation effect, large recrystallization structures are not required, the defects such as overburning and the like are not.
Disclosure of Invention
The invention aims to provide a production process of an aluminum alloy seamless pipe for aerospace. The aluminum alloy seamless pipe produced by the process has high strength, good corrosion resistance, no cracks on the surface, no casting defects such as cracks, pores, oxide films, looseness and the like in a macrostructure, has no coarse recrystallized structure and overburning in a microstructure, and meets the production requirement. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of an aluminum alloy seamless pipe for aerospace comprises the following steps:
s1 melting
S101, configuring furnace burden and respectively preheating the furnace burden and a smelting furnace;
s102, smelting in gas aluminum, and controlling the smelting temperature to be 720-750 ℃;
s103, increasing the smelting temperature to 800 ℃, and adding KZrF 6;
s104, stirring the melt by adopting an electromagnetic stirring device, and controlling the stirring time to be not less than 15 min;
s105, skimming dross on the surface of the melt by using a metallurgical deslagging device;
s106, sampling and carrying out rapid analysis in front of the furnace;
s107, covering the melt by using No. 2 flux;
s2 refining the alloy melt
S201, introducing high-purity argon and carbon tetrachloride using the high-purity argon as a carrier through a furnace bottom air brick, and controlling refining time to be 15-20 min;
s202, detecting the sodium content in the melt, and controlling omega (NA) to be less than 5 ppm;
s203, skimming dross on the surface of the melt by using a metallurgical deslagging device and covering the dross with No. 2 flux;
s204, carrying out grain refinement on the melt by using an Al-5Ti-1B grain refiner;
s205, performing online degassing on the melt through a processing device;
s206, performing online filtering by using a filtering device;
s3 homogenization heat treatment
S301, controlling the temperature to be 450-465 ℃;
s302, controlling the homogenization heat treatment time to be 16 h;
s303, sampling and detecting;
s4 extrusion
S401, performing saw cutting, turning and boring processing on the aluminum alloy hollow round ingot;
s402, adopting boron nitride to comprehensively lubricate a die and an extrusion pad, and adopting graphite oil to lubricate an extrusion needle;
s403, extruding the aluminum alloy seamless pipe;
s5 Heat treatment
S501, quenching the pipe;
s502, performing tension correction within 3h after quenching;
s503, carrying out artificial aging treatment within 4h after the tension correction treatment;
s504, extracting a sample for mechanical property detection.
Optionally or preferably, the aluminum alloy seamless pipe for aerospace comprises the following components: zn8.0-8.5%, Mg2.5-2.8%, Cu2.0-2.3%, Zr0.1-0.15%, Be0.002%, Fe0.25%, Si0.08%,
0.05 percent of Mn0.05 percent, 0.02 percent of Cr0.02 percent, 0.03 percent of Ti0 percent and the balance of Al, wherein the total weight percentage of all the components is 100 percent.
Alternatively or preferably, the furnace charge in step S101 comprises 99.7% remelted aluminum ingot, alloy primary scrap, electrolytic copper plate, pure metallic zinc ingot, pure metallic magnesium ingot, zirconium salt, flux No. 2, and Al-5TI-1B grain refiner.
Alternatively or preferably, the filter device in step S206 is a 30ppi/50ppi mesh configured double-click ceramic foam filter device.
Alternatively or preferably, the temperature rise time of the homogenization heat treatment in the step S302 is 4h, and the heat preservation time is 12 h.
Optionally or preferably, the extrusion process parameters in step S403 are: 28MN of an extruder, the extrusion coefficient of 21.86, the temperature of an extrusion cylinder of 400-420 ℃, the temperature of an ingot casting of 380-390 ℃, the temperature of a die of 450-470 ℃ and the extrusion speed of 0.2-0.3 mm/s.
Optionally or preferably, in the step S501, the quenching temperature is 470 ℃ ± 5 ℃, and the heat preservation time is 60-90 min.
Alternatively or preferably, the pipe is subjected to a tension correction process in step S502 by means of a wedge plug with an annular groove.
Alternatively or preferably, the heating temperature of the artificial aging treatment in the step S503 is 135 ℃ +/-5 ℃, and the heat preservation time is 16 h.
Based on the technical scheme, the following technical effects can be generated:
the production process of the aluminum alloy seamless pipe for the aerospace is suitable for producing the aluminum alloy seamless pipe for the aerospace. The aluminum alloy seamless pipe produced by the process has high strength, good corrosion resistance, no cracks on the surface, no casting defects such as cracks, pores, oxide films, looseness and the like in a macrostructure, has no coarse recrystallized structure and overburning in a microstructure, and meets the production requirement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The invention is further described below with reference to examples, but the scope of the invention is not limited to the following.
The invention provides a production process of an aluminum alloy seamless pipe for aerospace, which comprises the following steps:
s1 melting
S101, configuring furnace burden and respectively preheating the furnace burden and a smelting furnace;
s102, smelting in gas aluminum, and controlling the smelting temperature to be 720-750 ℃;
s103, increasing the smelting temperature to 800 ℃, and adding KZrF 6;
s104, stirring the melt by adopting an electromagnetic stirring device, and controlling the stirring time to be not less than 15 min;
s105, skimming dross on the surface of the melt by using a metallurgical deslagging device;
s106, sampling and carrying out rapid analysis in front of the furnace;
s107, covering the melt by using No. 2 flux;
s2 refining the alloy melt
S201, introducing high-purity argon and carbon tetrachloride using the high-purity argon as a carrier through a furnace bottom air brick, and controlling refining time to be 15-20 min;
s202, detecting the sodium content in the melt, and controlling omega (NA) to be less than 5 ppm;
s203, skimming dross on the surface of the melt by using a metallurgical deslagging device and covering the dross with No. 2 flux;
s204, carrying out grain refinement on the melt by using an Al-5Ti-1B grain refiner;
s205, performing online degassing on the melt through a processing device;
s206, performing online filtering by using a filtering device;
s3 homogenization heat treatment
S301, controlling the temperature to be 450-465 ℃;
s302, controlling the homogenization heat treatment time to be 16 h;
s303, sampling and detecting;
s4 extrusion
S401, performing saw cutting, turning and boring processing on the aluminum alloy hollow round ingot;
s402, adopting boron nitride to comprehensively lubricate a die and an extrusion pad, and adopting graphite oil to lubricate an extrusion needle;
s403, extruding the aluminum alloy seamless pipe;
s5 Heat treatment
S501, quenching the pipe;
s502, performing tension correction within 3h after quenching;
s503, carrying out artificial aging treatment within 4h after the tension correction treatment;
s504, extracting a sample for mechanical property detection.
As an optional embodiment, the aluminum alloy seamless pipe for aerospace comprises the following components: zn8.0-8.5%, Mg2.5-2.8%, Cu2.0-2.3%, Zr0.1-0.15%, Be0.002%, Fe0.25%,
0.08 percent of Si, 0.05 percent of Mn0.02 percent of Cr0.02 percent of Ti0.03 percent of Al and the balance of Al, wherein the total weight percentage of all the components is 100 percent.
As an alternative embodiment, the furnace material in the step S101 comprises a 99.7% remelting aluminum ingot, an alloy primary returning charge, an electrolytic copper plate, a pure metal zinc ingot, a pure metal magnesium ingot, a zirconium salt, a No. 2 flux and an Al-5TI-1B grain refiner.
As an alternative embodiment, the filter device in step S206 is a 30ppi/50ppi pore configured double-click ceramic foam filter device.
Alternatively, the temperature rise time of the homogenization heat treatment in step S302 is 4 hours, and the heat retention time is 12 hours.
As an alternative embodiment, the extrusion process parameters in step S403 are: 28MN of an extruder, the extrusion coefficient of 21.86, the temperature of an extrusion cylinder of 400-420 ℃, the temperature of an ingot casting of 380-390 ℃, the temperature of a die of 450-470 ℃ and the extrusion speed of 0.2-0.3 mm/s.
In an optional embodiment, the quenching temperature in step S501 is 470 ℃ ± 5 ℃, and the holding time is 60-90 min.
As an alternative embodiment, the pipe is subjected to a tension correction process by a wedge plug with an annular groove in step S502.
In an alternative embodiment, the heating temperature of the manual work efficiency treatment in the step S503 is 135 ℃ +/-5 ℃, and the holding time is 16 h.
Alternatively, in step S103, to increase the Zr element yield, KzrF6 is added after controlling the temperature at 800 ℃.
In an alternative embodiment, in step S202, ω (NA) < 5ppm is controlled to eliminate the occurrence of brittleness of the aluminum alloy sodium.
Claims (9)
1. A production process of an aluminum alloy seamless pipe for aerospace is characterized by comprising the following steps: the method comprises the following steps:
s1 melting
S101, configuring furnace burden and respectively preheating the furnace burden and a smelting furnace;
s102, smelting in gas aluminum, and controlling the smelting temperature to be 720-750 ℃;
s103, increasing the smelting temperature to 800 ℃, and adding KZrF 6;
s104, stirring the melt by adopting an electromagnetic stirring device, and controlling the stirring time to be not less than 15 min;
s105, skimming dross on the surface of the melt by using a metallurgical deslagging device;
s106, sampling and carrying out rapid analysis in front of the furnace;
s107, covering the melt by using No. 2 flux;
s2 refining the alloy melt
S201, introducing high-purity argon and carbon tetrachloride using the high-purity argon as a carrier through a furnace bottom air brick, and controlling refining time to be 15-20 min;
s202, detecting the sodium content in the melt, and controlling omega (NA) to be less than 5 ppm;
s203, skimming dross on the surface of the melt by using a metallurgical deslagging device and covering the dross with No. 2 flux;
s204, carrying out grain refinement on the melt by using an Al-5Ti-1B grain refiner;
s205, performing online degassing on the melt through a processing device;
s206, performing online filtering by using a filtering device;
s3 homogenization heat treatment
S301, controlling the temperature to be 450-465 ℃;
s302, controlling the homogenization heat treatment time to be 16 h;
s303, sampling and detecting;
s4 extrusion
S401, performing saw cutting, turning and boring processing on the aluminum alloy hollow round ingot;
s402, adopting boron nitride to comprehensively lubricate a die and an extrusion pad, and adopting graphite oil to lubricate an extrusion needle;
s403, extruding the aluminum alloy seamless pipe;
s5 Heat treatment
S501, quenching the pipe;
s502, performing tension correction within 3h after quenching;
s503, carrying out artificial aging treatment within 4h after the tension correction treatment;
s504, extracting a sample for mechanical property detection.
2. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: the aluminum alloy seamless pipe for aerospace comprises the following components: zn8.0-8.5%, Mg2.5-2.8%, Cu2.0-2.3%, Zr0.1-0.15%, Be0.002%, Fe0.25%, Si0.08%, Mn0.05%,
0.02 percent of Cr0.03 percent, 0.03 percent of TI and the balance of Al, wherein the sum of the weight percent of all the components is 100 percent.
3. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in the step S101, the furnace material comprises 99.7% remelting aluminum ingot, alloy primary foundry returns, an electrolytic copper plate, a pure metal zinc ingot, a pure metal magnesium ingot, a zirconium salt, a No. 2 flux and an Al-5TI-1B grain refiner.
4. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in step S206, the filter device was a 30ppi/50ppi mesh double-click ceramic foam filter device.
5. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in step S302, the temperature rise time of the homogenization heat treatment is 4 hours, and the heat preservation time is 12 hours.
6. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: the parameters of the extrusion process in step S403 are: 28MN of an extruder, the extrusion coefficient of 21.86, the temperature of an extrusion cylinder of 400-420 ℃, the temperature of an ingot casting of 380-390 ℃, the temperature of a die of 450-470 ℃ and the extrusion speed of 0.2-0.3 mm/s.
7. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in the step S501, the quenching temperature is 470 +/-5 ℃, and the heat preservation time is 60-90 min.
8. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in step S502, the pipe is subjected to a tension correction process by a wedge plug with an annular groove.
9. The production process of the aluminum alloy seamless pipe for the aerospace, according to claim 1, is characterized in that: in step S503, the heating temperature of the artificial aging treatment is 135 +/-5 ℃, and the heat preservation time is 16 h.
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| CN202011261796.8A CN112322919B (en) | 2020-11-12 | 2020-11-12 | Production process of aluminum alloy seamless pipe for aerospace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114807699A (en) * | 2022-05-27 | 2022-07-29 | 西北铝业有限责任公司 | High-strength high-toughness thin-walled tube for nuclear industry and preparation method thereof |
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