CN114457265B - High-strength high-fatigue-performance 6-series aluminum alloy, gas cylinder and preparation method thereof - Google Patents
High-strength high-fatigue-performance 6-series aluminum alloy, gas cylinder and preparation method thereof Download PDFInfo
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- CN114457265B CN114457265B CN202210111083.6A CN202210111083A CN114457265B CN 114457265 B CN114457265 B CN 114457265B CN 202210111083 A CN202210111083 A CN 202210111083A CN 114457265 B CN114457265 B CN 114457265B
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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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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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
- 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
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
- C22F1/047—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 magnesium as the next major constituent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a 6-series aluminum alloy for a high-strength high-fatigue-performance gas cylinder and a preparation method of the gas cylinder, comprising the following steps: washing a furnace, smelting, refining, degassing, filtering, casting, homogenizing heat treatment, ultrasonic flaw detection, hot rolling, cold rolling, recrystallization annealing, preparing an aluminum alloy coiled material with the thickness of 4.0mm, and carrying out solution treatment and time-efficient treatment on a gas cylinder after flattening, blanking, stamping and deep drawing for two times; the method uses Mg of 6 series material 2 The Si strengthening phase is configured to be more than 1.85% of the maximum solid solution quantity, so that the later strength is improved; the method has the advantages that the furnace washing is firstly carried out to remove impurities before smelting, and the hydrogen content and the slag content of aluminum liquid are strictly controlled during smelting, so that metallurgical defects are reduced; the homogenization heat treatment adopts high-temperature treatment to refine the second phase of the cast ingot to the average size of less than 10 mu m, so as to reduce the influence of coarse second relative fatigue damage; the cold rolling reduction ratio of the cold rolling section is more than 70%, and the base material grains after annealing are thinned; the tensile strength of the prepared gas cylinder after spray quenching at 550-560 ℃ and aging treatment at 160-165 ℃ is up to more than 340MPa, and the fatigue cycle times can be up to more than 16000 times.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy processing, and particularly relates to a 6-series aluminum alloy with high strength and high fatigue property.
Background
The aluminum alloy gas cylinder is widely applied to the fields of electronics, medical treatment, diving, chemical industry, metallurgy and the like; the aluminum alloy gas cylinder is mainly used for filling standard gas, standard mixed gas, special mixed gas, ultrapure gas, oxygen, carbon dioxide and other gases, and can be used for filling coal gas and carbon monoxide gas; due to the requirements of the use conditions of the aluminum alloy gas cylinder, the aluminum alloy gas cylinder is required to have high strength and high fatigue property.
One of the most common forms of structural failure of a gas cylinder is fatigue failure. At present, fatigue failure cannot be found timely by modern technology. The yield limit and the tensile strength of the material are generally higher than the maximum stress at which fatigue failure occurs, so that it is often the case for crack failure to occur without any sign, a low stress failure. Therefore, fatigue failure phenomenon in the industrial field should be timely prevented, and loss of manpower, financial resources and material resources is avoided. "fatigue failure" is very common in reality. It is counted that 50% -85% of the damage to the gas cylinder is fatigue damage. The gas cylinder belongs to a movable pressure container, and fatigue damage is sudden and has no symptoms, so that the fatigue performance of the gas cylinder is a key point of safe use of the gas cylinder.
According to the requirement of GB11640-2011 'seamless aluminum alloy gas cylinder', the fatigue detection cycle number of the current seamless aluminum alloy gas cylinder is 12000 times as a qualified standard, but in fact, most fatigue cycle numbers are 12000 to 13000 times. With the progress of industrial technology, people put forward higher requirements on the working pressure and the fatigue life of the aluminum alloy gas cylinder.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an effective 6-series aluminum alloy with high strength and high fatigue performance.
The technical scheme of the invention is as follows:
the 6-series aluminum alloy with high strength and high fatigue performance is prepared by the following steps:
s1, washing a furnace, putting 99.70% aluminum ingots into a smelting furnace for smelting, and evacuating aluminum liquid after smelting for a period of time;
s2, smelting, namely putting the raw materials into a smelting furnace for smelting, smelting to obtain an aluminum alloy solution after the temperature in the smelting furnace reaches 750-760 ℃, and transferring the aluminum alloy solution into a refining furnace;
s3, refining, namely introducing chlorine and argon into a refining furnace to refine, refining the refining furnace twice for 40 minutes each time, standing the middle for 60 minutes, and standing for 30 minutes when the content of hydrogen in the melt is less than 0.25mL/100gAl after the refining is completed;
s4, degassing and filtering, namely introducing argon and chlorine into the degassing furnace to carry out degassing after the step S3 is completed, simultaneously adding a grain refiner 5Ti-0.2B on line, and carrying out two-stage filtering by adopting a 30ppi ceramic filter plate and a 60ppi ceramic filter plate in sequence to obtain an aluminum alloy purifying liquid; the hydrogen content in the aluminum alloy purifying liquid is below 0.1mL/100gAl, and the content of the impurities in the launder is less than 0.02mm 2 /kg；
S5, casting, namely casting the aluminum alloy purifying liquid after slag skimming into an aluminum alloy cast ingot after the step S4, wherein the thickness of the aluminum alloy cast ingot is 650mm;
s6, homogenizing heat treatment, namely placing the aluminum alloy ingot obtained in the step S5 into a heating furnace for homogenizing heat treatment after sawing and milling, setting the furnace gas temperature of the heating furnace to 600 ℃, and when the metal temperature is controlled to 560 ℃, adjusting the furnace gas temperature of the heating furnace to 570+/-3 ℃, and preserving heat for 20 hours;
s7, hot rolling, namely after ultrasonic flaw detection is carried out on the aluminum alloy ingot subjected to homogenization heat treatment, hot rolling is carried out on the aluminum alloy ingot meeting the requirements, during hot rolling, the furnace temperature is preheated to 520 ℃, after the temperature of the aluminum alloy ingot reaches 480 ℃, hot rough rolling is carried out, rough rolling is carried out until the thickness is 28.0mm, and hot rolling is carried out on the aluminum alloy ingot by reheating finish rolling for one pass until the thickness is 14.0mm, so as to obtain a hot rolled strip; the finishing temperature is 260-270 ℃, and air cooling is carried out after hot rolling is finished;
s8, cold rolling and annealing, namely performing multi-pass cold rolling on the hot rolled strip obtained in the step S7 to obtain a cold rolled strip with the thickness of 4.0mm, cleaning the cold rolled strip, performing complete annealing, and performing annealing at the annealing metal temperature of 360+/-3 ℃ for 2 hours to obtain the aluminum alloy substrate after annealing treatment.
Preferably, the raw materials comprise the following chemical components in percentage by mass: si=0.73-0.78%, fe not more than 0.22%, cu=0.15-0.25%, mn not more than 0.05%, mg=1.12-1.18%, cr=0.18-0.23%, zn not more than 0.05%, ti=0.02-0.03%, al and other unavoidable elements, said other unavoidable individual elements not more than 0.05%, and not more than 0.15% in total.
Preferably, when the raw material is added in S2, the Al content in the added aluminum ingot is 99.85% or more, and no return aluminum material or waste aluminum material is added.
Preferably, in the step S3, the refining furnace adopts an Almex aluminum melting refining furnace in the United states, and the argon gas flow rate of the 1# rotor and the 3# rotor of the aluminum melting refining furnace is 1.0+/-0.2 m 3 And the chlorine flow of the rotor # 2 is 0.05+/-0.0.01 m 3 And/h, the No. 4 rotor is not filled with chlorine.
Preferably, in the step S4, the hydrogen/AL in the aluminum alloy purifying liquid is 0.1mL/1The content of the impurities in the launder is less than 0.02mm and less than 00g 2 /kg。
Preferably, in the step S6, the sawing and milling process is that the bottom 300m and the top 200mm of the aluminum alloy ingot are sawed, the bottom is 20mm thick after being cut, a metallographic microscope is used for analyzing the microstructure under 250 times, the size of the residual second phase is measured, the average size of the second phase is less than 10 μm, and the maximum size is less than 15 μm; milling the surface requires 15mm for each of the upper and lower surfaces and 10mm for each of the side surfaces, and is required to be smooth and clean;
and S7, the ultrasonic flaw detection requirement of the aluminum alloy cast ingot reaches above A level.
Compared with the prior art, the high-strength high-fatigue-performance 6-series aluminum alloy has the following beneficial effects:
1. when the high-strength high-fatigue-performance 6-series aluminum alloy is prepared, the metallurgical quality is improved by reducing the impurity content, degassing operation and aluminum alloy ingot flaw detection operation:
1) Before smelting by using a smelting furnace, the invention uses 99.70% aluminum ingot to carry out furnace washing operation on the smelting furnace, thereby washing away impurity elements such as Fe, mn and the like remained in the smelting furnace, and avoiding the exceeding of the content of Fe, mn and the like in the 6-series aluminum alloy with high strength and high fatigue performance produced in the application;
2) In the refining process, the invention performs refining twice, degassing twice and filtering twice, and slagging off a degassing furnace during casting, thereby further removing impurities and purifying the aluminum alloy melt;
3) In the degassing and filtering link, the invention adopts argon and a small amount of chlorine to refine and degas, which not only can effectively remove hydrogen in aluminum melt, but also can well remove alkali metal to control the hydrogen content and the inclusion content in the aluminum alloy purifying liquid, so that the hydrogen content of the launder is less than 0.1mL/100gAl, and the inclusion content of the launder is less than 0.02mm 2 /kg. The two key controls of the hydrogen content and the slag content effectively remove harmful gas and nonmetallic inclusions in the aluminum alloy melt, improve the metallurgical quality of materials, thereby reducing the possibility of generating fatigue sources and crack sources caused by stress concentration caused by loosening or slag inclusion in the gas cylinder service process and greatly improvingFatigue performance of the cylinder.
2. In the alloy component proportion of the 6-series material, the main strengthening elements Mg and Si in the material are configured to be 1.85 percent on the basis of ensuring that the Si element has the residual content of 0.1 percent, so that the main strengthening phase Mg2Si phase reaches the maximum solubility of Mg2Si, and the high strength of the material is realized.
3. In the homogenization heat treatment process, the temperature of ingot casting is measured by punching, the temperature of furnace gas is 600 ℃, the temperature of converter gas is 570+/-3 ℃ when the temperature of metal reaches 560 ℃, timing is carried out at the same time, the heat preservation time is 20 hours, and the ingot casting is discharged for air cooling after the heat preservation is finished. The average size of the second phase after the ingot is soaked at the high temperature is below 10 mu m, the maximum size is below 15 mu m, and the second phase is more uniform; thereby reducing the adverse effect of oversized second phase or uneven distribution of second phase on cylinder fatigue performance. In the hot rolling process, hot rolling is carried out by adopting a large reduction; thereby better crushing the second phase to improve the fatigue performance of the finished aluminum alloy;
4. in the hot rolling process, the final rolling temperature is controlled to be 260-270 ℃, and air cooling is carried out after hot rolling is finished, so that blank grains are effectively refined, and static recrystallization of blanks at high temperature caused by overhigh final rolling temperature and slow cooling is avoided; in the cold rolling process, the hot rolled strip with the thickness of 14.0mm is subjected to multi-pass cold rolling to obtain the cold rolled strip with the thickness of 4.0mm, and the corresponding cold rolling reduction ratio is more than 70%, so that the annealed grains can be effectively refined;
in a word, the 6-series aluminum alloy prepared by the preparation method provided by the invention has high strength and high fatigue property.
The cylinder body of the gas cylinder is manufactured by adopting the high-strength high-fatigue-performance 6-series aluminum alloy.
The preparation method of the gas cylinder comprises the following specific preparation processes:
sequentially flattening and blanking the 4.0mm aluminum alloy base material to prepare a round sheet, stamping and forming, and drawing for two times, and closing in to prepare an aluminum alloy seamless gas cylinder with the required specification;
the aluminum alloy seamless gas cylinder is subjected to spray type water quenching treatment after being subjected to heat preservation for 30-60min at 550-560 ℃; then aging treatment is carried out at 160-165 ℃ and the heat preservation time is 15-16h.
Compared with the prior art, the beneficial effects of the gas cylinder provided by the invention are as follows:
1. the high-strength high-fatigue-performance 6-series aluminum alloy prepared by the method is used for preparing the gas cylinder, and can ensure that the tensile strength of the gas cylinder is more than 340MPa so as to ensure the high-strength performance of the gas cylinder;
2. the aging temperature is controlled at 160-165 ℃ in the process of preparing the gas cylinder, so that the aging precipitated phase is in a dispersed fine state at a lower aging temperature, and the strength and the high fatigue performance of the gas cylinder are further improved;
in a word, the gas cylinder prepared by the preparation method provided by the invention has good strength and high fatigue performance.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A6-series aluminum alloy with high strength and high fatigue performance comprises the following preparation processes:
s1, preparing the following raw materials in percentage by weight: si=0.73-0.78%, fe is less than or equal to 0.22%, cu=0.15-0.25%, mn is less than or equal to 0.05%, mg=1.12-1.18%, cr=0.18-0.23%, zn is less than or equal to 0.05%, ti=0.02-0.03%, al and other unavoidable elements, said other unavoidable individual elements being less than or equal to 0.05%, and the total is less than or equal to 0.15%;
s2, washing a furnace, namely loading 99.70% aluminum ingots for casting 6061 aluminum alloy into a smelting furnace for smelting, and evacuating aluminum liquid after smelting for a period of time;
s3, smelting, and packaging 99.70% of aluminum ingotsSmelting in a smelting furnace, smelting to obtain aluminum alloy melt after the temperature in the smelting furnace reaches 760 ℃, and transferring the aluminum alloy melt to a refining furnace; the Al content in the added aluminum ingot is more than 99.85 percent, and no return aluminum material or waste aluminum material is added; the argon gas flow of the l# rotor and the 3# rotor of the aluminum melting refining furnace is 1.0+/-0.2 m 3 And the chlorine flow of the rotor # 2 is 0.05+/-0.0.01 m 3 The rotor # 4 is not filled with chlorine;
s4, refining, namely introducing chlorine and argon into the refining furnace to refine, refining the refining furnace twice for 40 minutes each time, standing the middle for 60 minutes, and standing for 30 minutes when the content of hydrogen in the melt is less than 0.25mL/100gA1 after the refining is completed;
s5, degassing and filtering, namely introducing argon and chlorine into the degassing furnace to carry out degassing after the step S4 is completed, simultaneously adding a grain refiner 5Ti-0.2B on line, and carrying out two-stage filtering by adopting a 30ppi ceramic filter plate and a 60ppi ceramic filter plate in sequence to obtain an aluminum alloy purifying liquid; the hydrogen content in the aluminum alloy purifying liquid is below 0.1mL/100gAl, and the content of the impurities in the launder is less than 0.02mm 2 /kg；
S6, casting, namely casting the aluminum alloy purifying liquid after slag skimming into an aluminum alloy cast ingot with the thickness of 650mm after the step S5 is completed;
s7, homogenizing heat treatment, namely placing the aluminum alloy ingot obtained in the step S6 into a heating furnace for homogenizing heat treatment after sawing and milling, setting the furnace gas temperature of the heating furnace to 600 ℃, and when the metal temperature reaches 560 ℃, adjusting the furnace gas temperature of the heating furnace to 570+/-3 ℃, and preserving heat for 20 hours; sawing 300m at the bottom and 200mm at the top of an aluminum alloy ingot, taking 20mm thickness at the bottom after cutting, analyzing a microstructure under 250 times by using a metallographic microscope, and measuring the size of a residual second phase, wherein the average size of the second phase is below 10 mu m, and the maximum size is below 15 mu m; milling the surface requires 15mm for each of the upper and lower surfaces and 10mm for each of the side surfaces, and is required to be smooth and clean;
s8, hot rolling, namely after ultrasonic flaw detection, carrying out hot rolling on the aluminum alloy ingot reaching the grade A above, preheating the furnace temperature to 520 ℃ during hot rolling, carrying out hot rough rolling after the temperature of the aluminum alloy ingot reaches 480 ℃, carrying out rough rolling until the thickness is 28.0mm, and carrying out hot rolling on the aluminum alloy ingot by reheating and finish rolling for one pass until the thickness is 14.0mm to obtain a hot-rolled strip; the finishing temperature is 260 ℃, and air cooling is carried out after hot rolling is finished;
s9, cold rolling and annealing, namely performing multi-pass cold rolling on the hot rolled strip obtained in the step S8 to obtain a cold rolled strip with the thickness of 4.0mm, cleaning the cold rolled strip, performing complete annealing, and performing annealing at the annealing metal temperature of 360+/-3 ℃ for 2 hours to obtain the aluminum alloy substrate after annealing treatment.
The cylinder body of the gas cylinder is manufactured by adopting the high-strength high-fatigue-performance 6-series aluminum alloy.
The preparation method of the gas cylinder comprises the following specific preparation processes:
sequentially flattening and blanking the 4.0mm aluminum alloy base material to prepare a round sheet, stamping and forming, and drawing for two times, and closing in to prepare an aluminum alloy seamless gas cylinder with the required specification;
the aluminum alloy seamless gas cylinder is subjected to spray type water quenching treatment after being subjected to heat preservation for 30-60min at 550-560 ℃; then aging treatment is carried out at 160-165 ℃ and the heat preservation time is 15-16h.
Comparative example 1
Comparative example 1 was substantially the same as the production method of example 1 except that in the execution of step S1, the addition amount of Mg was 0.8 to 1.0% and the addition amount of Si was 0.4 to 0.6%; i.e. the content of the strengthening phase in the chemical composition arrangement is low.
Comparative example 2
Comparative example 2 was substantially the same as example 1 except that the furnace washing step was not performed, and the aluminum ingot containing the scrap aluminum was added in the melting step; i.e. the impurity content in the substrate chemistry is higher.
Comparative example 3
Comparative example 3 is substantially the same as the production method of example 1 except that, in carrying out the homogenization heat treatment of step S7, the furnace gas temperature of the heating furnace is adjusted to 540±3 ℃ and kept for 20 hours while the metal temperature is controlled to 530 ℃; i.e. the homogenization heat treatment temperature is lower.
Comparative example 4
Comparative example 4 was substantially the same as the production method of example 1 except that, at the time of performing the step S8, a 28.0mm thick slab was hot rolled twice to a 8.0mm thick hot rolled strip; then, in the step S9, a cold-rolled strip with the thickness of 4.0mm is obtained from the hot-rolled strip with the thickness of 8.0mm after multi-pass cold rolling. I.e. the cold rolling overall reduction is lower.
Comparative example 5
Comparative example 5 was produced in substantially the same manner as in example 1, and the aging temperature was 180 ℃.
The results of ultrasonic flaw detection of the conductive properties of the aluminum alloy substrates prepared by example 1 and comparative examples 1 to 5 are shown below:
| example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Tensile strength MPa | 343 | 310 | 344 | 338 | 345 | 312 |
| Yield strength MPa | 315 | 280 | 313 | 306 | 316 | 290 |
| Elongation after break% | 14 | 13.5％ | 14.0％ | 12.5％ | 14.5％ | 13.0％ |
| Number of fatigue cycles | 16200 | 12800 | 12500 | 12500 | 13000 | 12700 |
From the above experimental data, it can be seen that:
comparative example 1 has lower strength and lower fatigue cycle times due to lower content of strengthening phase in alloy components;
comparative example 2 has lower fatigue cycle times because of higher impurity content in the alloy components;
comparative example 3 has a lower fatigue cycle number due to a lower homogenization heat treatment temperature and a larger second phase;
comparative example 4 because the reduction ratio between the hot rolled blank and the finished product thickness is low, the substrate grains are slightly larger, and the fatigue cycle times are low;
comparative example 5 resulted in lower final strength and lower fatigue cycle times due to higher aging temperature.
The 6-series aluminum alloy prepared by the method provided by the invention has higher strength and higher fatigue resistance. The gas cylinder prepared by adopting the aging temperature in the method of the invention has the advantages that the precipitated phase is in a uniform and fine dispersion state during aging.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (5)
1. The high-strength high-fatigue-performance 6-series aluminum alloy is characterized by being prepared by the following steps:
s1, washing a furnace, putting 99.70% aluminum ingots into a smelting furnace for smelting, and evacuating aluminum liquid after smelting for a period of time;
s2, smelting, namely putting the raw materials into a smelting furnace after the furnace washing of S1 to smelt to obtain an aluminum alloy melt, and transferring the aluminum alloy melt into a refining furnace;
s3, refining, namely introducing chlorine and argon into a refining furnace to refine, refining the refining furnace twice for 40 minutes each time, standing the middle for 60 minutes, and standing for 30 minutes when the content of hydrogen in the melt is less than 0.25mL/100gAl after the refining is completed;
s4, degassing and filtering, namely introducing argon and chlorine into the degassing furnace to carry out degassing after the step S3 is completed, simultaneously adding a grain refiner 5Ti-0.2B on line, and carrying out two-stage filtering by adopting a 30ppi ceramic filter plate and a 60ppi ceramic filter plate in sequence to obtain an aluminum alloy purifying liquid; the hydrogen content in the aluminum alloy purifying liquid is below 0.1mL/100gAl, and the impurity content of a launder is less than 0.02 mm/kg;
s5, casting, namely casting the aluminum alloy purifying liquid after slag skimming into an aluminum alloy cast ingot after the step S4, wherein the thickness of the aluminum alloy cast ingot is 650mm;
s6, homogenizing heat treatment, namely placing the aluminum alloy ingot obtained in the step S5 into a heating furnace for homogenizing heat treatment after sawing and milling, setting the furnace gas temperature of the heating furnace to 600 ℃, and when the metal temperature reaches 560 ℃, adjusting the furnace gas temperature of the heating furnace to 570+/-3 ℃, and preserving heat for 20 hours;
sawing and milling the surface, namely sawing 300m at the bottom and 200mm at the top of an aluminum alloy ingot, taking 20mm thickness at the bottom after cutting, analyzing a microstructure by a metallographic microscope at 250 times, and measuring the size of a residual second phase, wherein the average size of the second phase is below 10 mu m, and the maximum size is below 15 mu m; milling the surface requires 15mm for each of the upper and lower surfaces and 10mm for each of the side surfaces, and is required to be smooth and clean;
s7, hot rolling, namely after ultrasonic flaw detection is carried out on the aluminum alloy ingot subjected to homogenization heat treatment to reach the grade A, hot rolling is carried out on the aluminum alloy ingot meeting the requirements, during hot rolling, the furnace temperature is preheated to 520 ℃, hot rough rolling is carried out after the temperature of the aluminum alloy ingot reaches 480 ℃, rough rolling is carried out to reach the thickness of 28.0mm, and hot rolling is carried out on the aluminum alloy ingot by reheating finish rolling for one pass to reach 14.0mm to obtain a hot rolled strip; the finishing temperature is 260-270 ℃, and air cooling is carried out after hot rolling is finished;
s8, cold rolling and annealing, namely performing multi-pass cold rolling on the hot rolled strip obtained in the step S7 to obtain a cold rolled strip with the thickness of 4.0mm, cleaning the cold rolled strip, performing complete annealing, and performing annealing at the annealing metal temperature of 360+/-3 ℃ for 2 hours to obtain an aluminum alloy substrate after annealing treatment;
the raw materials comprise the following chemical components in percentage by mass: si=0.73-0.78%, fe not more than 0.22%, cu=0.15-0.25%, mn not more than 0.05%, mg=1.12-1.18%, cr=0.18-0.23%, zn not more than 0.05%, ti=0.02-0.03%, al and other unavoidable elements, said other unavoidable individual elements not more than 0.05%, and not more than 0.15% in total.
2. The high-strength high-fatigue property 6-series aluminum alloy according to claim 1, wherein: when the raw materials are added in the S2, the Al content in the added aluminum ingot is more than 99.85 percent, and no return aluminum material or waste aluminum material is added.
3. The high-strength high-fatigue property 6-series aluminum alloy according to claim 1, wherein: in the step S3, the argon gas flow of the 1# rotor and the 3# rotor of the aluminum melting refining furnace is 1.0+/-0.2 m 3 And the chlorine flow of the rotor # 2 is 0.05+/-0.001 m 3 And/h, the No. 4 rotor is not filled with chlorine.
4. A gas cylinder, characterized in that: the cylinder body of the gas cylinder is manufactured by adopting the high-strength high-fatigue-performance 6-series aluminum alloy as claimed in claim 1.
5. A method for preparing a gas cylinder comprising the gas cylinder according to claim 4, wherein the gas cylinder is prepared by the following steps:
sequentially flattening and blanking the 4.0mm aluminum alloy base material to prepare a round sheet, stamping and forming, and drawing for two times, and closing in to prepare an aluminum alloy seamless gas cylinder with the required specification;
the aluminum alloy seamless gas cylinder is subjected to spray type water quenching treatment after being subjected to heat preservation for 30-60min at 550-560 ℃; then aging treatment is carried out at 160-165 ℃ and the heat preservation time is 15-16h.
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| CN115747535B (en) * | 2022-09-07 | 2023-10-03 | 河南明晟新材料科技有限公司 | Manufacturing method for improving edge covering performance of 6016 automobile stamping plate |
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| CN115652152B (en) * | 2022-11-30 | 2023-03-17 | 中铝材料应用研究院有限公司 | 5XXX aluminum alloy capable of refining MIG (Metal-inert gas welding) weld grains and preparation method and application thereof |
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