CN114457265A - High-strength high-fatigue-performance 6-series aluminum alloy, gas cylinder and preparation method of gas cylinder - Google Patents
High-strength high-fatigue-performance 6-series aluminum alloy, gas cylinder and preparation method of gas cylinder Download PDFInfo
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- CN114457265A CN114457265A CN202210111083.6A CN202210111083A CN114457265A CN 114457265 A CN114457265 A CN 114457265A CN 202210111083 A CN202210111083 A CN 202210111083A CN 114457265 A CN114457265 A CN 114457265A
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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, wherein the preparation method comprises 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, flattening, blanking, stamping, drawing twice and forming, and then carrying out solid solution treatment and time effect treatment on the gas cylinder; the method comprises mixing Mg of 6-series material2The Si strengthening phase is configured to the maximum solid solution amount of more than 1.85 percent, so that the later strength is improved; the furnace washing is firstly carried out to remove impurities before smelting, and the hydrogen content of the aluminum liquid is strictly controlled during smeltingThe slag content is reduced, and the metallurgical defects are reduced; the homogenization heat treatment adopts high-temperature treatment to refine the second phase of the cast ingot to an average size of less than 10 mu m, so as to reduce the influence of the coarse second phase on fatigue failure; the cold rolling reduction rate of the cold rolling section is more than 70%, and annealed substrate crystal grains are refined; the tensile strength of the prepared gas cylinder after spray quenching at 550-560 ℃ and aging treatment at 160-165 ℃ reaches more than 340MPa, and the fatigue cycle number reaches 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 engineering, metallurgy and the like; the aluminum alloy gas cylinder is mainly used for filling gases such as standard gas, standard mixed gas, special mixed gas, ultrapure gas, oxygen, carbon dioxide and the like, and can be used for filling 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 properties.
Among the structural failures of gas cylinders, one of the most common forms is fatigue failure. Up to now, fatigue failure cannot be discovered in time with modern technology. In general, when fatigue failure occurs, the yield limit and the tensile strength of the material are higher than the maximum stress value at that time, so that crack failure often occurs without any sign, and is a low-stress failure. Therefore, the fatigue failure phenomenon in the industrial field should be prevented in time, and the loss of manpower, financial resources and material resources is avoided. "fatigue failure" is very common in reality. According to statistics, 50% -85% of the gas cylinder failures belong to fatigue failures. The gas cylinder belongs to a movable pressure container, and fatigue failure is usually sudden and has no symptoms, so the fatigue performance of the gas cylinder is the key point for safe use of the gas cylinder.
According to the requirements of GB11640-2011 'aluminum alloy seamless gas cylinder', the fatigue detection cycle number of the existing aluminum alloy seamless gas cylinder is 12000 times, which is a qualified standard, but most of the fatigue detection cycle numbers are 12000-13000 times in fact. 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 the furnace, namely, putting 99.70 percent of aluminum ingots into a smelting furnace for smelting, and emptying aluminum liquid after smelting for a period of time;
s2, smelting, namely placing the raw materials into a smelting furnace for smelting, smelting to obtain aluminum alloy melt after the temperature in the smelting furnace reaches 750-760 ℃, and then transferring the aluminum alloy melt into a refining furnace;
s3, refining, namely introducing chlorine and argon into the refining furnace for refining, refining the refining furnace twice, wherein each time of refining is 40 minutes, the middle of refining is kept stand for 60 minutes, and the refining furnace is kept stand for 30 minutes again when the hydrogen content of the melt is measured to be less than 0.25mL/100gAl after the two times of refining;
s4, degassing and filtering, wherein after S3 is completed, argon and chlorine are introduced into the degassing furnace for degassing, meanwhile, a grain refiner 5Ti-0.2B is added on line, and then a 30ppi ceramic filter plate and a 60ppi ceramic filter plate are sequentially adopted for two-stage filtering to obtain an aluminum alloy purifying solution; the hydrogen content in the aluminum alloy purifying liquid is less than 0.1mL/100gAl, and the inclusion content in the launder is less than 0.02mm2/kg；
S5, casting, namely after S4 is finished, casting the aluminum alloy purifying liquid subjected to slag skimming into an aluminum alloy ingot, wherein the thickness of the aluminum alloy ingot is 650 mm;
s6, carrying out homogenization heat treatment, namely, sawing and milling the aluminum alloy ingot obtained in the step S5, then placing the aluminum alloy ingot into a heating furnace for homogenization heat treatment, setting the furnace gas temperature of the heating furnace to 600 ℃, adjusting the furnace gas temperature of the heating furnace to 570 +/-3 ℃ when the metal temperature is controlled to 560 ℃, and carrying out heat preservation for 20 hours;
s7, hot rolling, namely, after ultrasonic flaw detection is carried out on the aluminum alloy cast ingot subjected to the homogenization heat treatment, carrying out hot rolling on the aluminum alloy cast ingot meeting the requirement, wherein during the hot rolling, the furnace temperature is preheated to 520 ℃, hot rough rolling is carried out after the temperature of the aluminum alloy cast ingot reaches 480 ℃, the thickness of the aluminum alloy cast ingot is 28.0mm, and the aluminum alloy cast ingot is subjected to hot finish rolling for one pass until the thickness of the aluminum alloy cast ingot reaches 14.0mm to obtain a hot rolled strip; the final rolling temperature is 260-270 ℃, and air cooling is carried out after hot rolling is finished;
and S8, cold rolling and annealing, namely, carrying out 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, carrying out complete annealing, keeping the annealing metal temperature at 360 +/-3 ℃ for 2h, carrying out annealing, and carrying out annealing treatment to obtain the aluminum alloy base material.
Preferably, the raw materials comprise the following chemical components in percentage by mass: 0.73 to 0.78 percent of Si, less than or equal to 0.22 percent of Fe, 0.15 to 0.25 percent of Cu, less than or equal to 0.05 percent of Mn, 1.12 to 1.18 percent of Mg, 0.18 to 0.23 percent of Cr, less than or equal to 0.05 percent of Zn, 0.02 to 0.03 percent of Ti, less than or equal to 0.05 percent of Al and other inevitable elements, wherein the other inevitable elements are less than or equal to 0.05 percent, and the total is less than or equal to 0.15 percent.
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 S3, the refining furnace adopts an American Almex molten aluminum refining furnace, and the flow of argon introduced into 1# and 3# rotors of the molten aluminum refining furnace is 1.0 +/-0.2 m3The chlorine flow rate of the No. 2 rotor is 0.05 +/-0.0.01 m3And h, the No. 4 rotor is not communicated with chlorine gas.
Preferably, in the S4, the hydrogen/AL ratio in the aluminum alloy purifying liquid is less than 0.1mL/100g, and the content of impurities in a launder is less than 0.02mm2/kg。
Preferably, in the step S6, the sawing and milling process includes sawing 300m of the bottom and 200mm of the top of the aluminum alloy ingot, cutting the aluminum alloy ingot to a thickness of 20mm, analyzing the microstructure by a metallographic microscope at 250 times, and measuring the size of the residual second phase, wherein the average size of the second phase is less than 10 μm, and the maximum size is less than 15 μm; milling the upper surface and the lower surface of the surface by 15mm respectively, milling the side surface by 10mm respectively, and requiring smoothness and cleanness;
and the ultrasonic flaw detection requirement of the aluminum alloy cast ingot in the S7 reaches above grade A.
Compared with the prior art, the 6-series aluminum alloy with high strength and high fatigue performance provided by the invention has the following beneficial effects:
1. when the high-strength high-fatigue-performance 6-series aluminum alloy is prepared, the metallurgical quality is improved through reducing the impurity content, degassing operation and aluminum alloy ingot flaw detection operation:
1) before the smelting furnace is used for smelting, 99.70 percent of aluminum ingots are used for washing the smelting furnace, so that impurity elements such as Fe, Mn and the like remained in the smelting furnace are washed away, and the content exceeding of Fe, Mn and the like in the 6-series aluminum alloy with high strength and high fatigue performance produced in the application is avoided;
2) in the refining process, twice refining is carried out, twice degassing and twice filtering are carried out, and a degassing furnace is subjected to slagging-off during casting, so that the molten aluminum alloy is further subjected to impurity removal and purification;
3) in the degassing and filtering link, the refining and degassing are carried out by adopting argon and a small amount of chlorine, so that not only can hydrogen in the aluminum melt be effectively removed, but also the hydrogen content and the impurity content in the aluminum alloy purifying solution can be controlled by a good alkali metal removing effect, the hydrogen content in the launder can reach below 0.1mL/100gAl, and the impurity content in the launder is less than 0.02mm2In terms of/kg. The two key controls of the hydrogen content and the slag content effectively remove harmful gases and non-metal inclusions in the aluminum alloy melt, and improve the metallurgical quality of the material, thereby reducing the possibility of generating fatigue sources and crack sources due to stress concentration caused by loosening or slag inclusion in the service process of the gas cylinder, and greatly improving the fatigue performance of the gas cylinder.
2. In the alloy composition proportion of the material 6, the main strengthening elements Mg and Si in the material are 1.85 percent of Mg2Si on the basis of ensuring that the Si element has residual 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 cast ingot is punched to measure the temperature, the furnace gas temperature is 600 ℃, the converter gas temperature is 570 +/-3 ℃ when the metal temperature reaches 560 ℃, the time is counted at the same time, the heat preservation time is 20 hours, and the cast ingot is discharged from the furnace for air cooling after the heat preservation is finished. After the ingot is soaked at the high temperature, the average size of the second phase is less than 10 mu m, the maximum size is less than 15 mu m, and the second phase is more uniform; thereby reducing the disadvantage of the over-sized second phase or the uneven distribution of the second phase on the fatigue performance of the cylinder. In the hot rolling process, hot rolling is carried out by adopting 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 finish rolling temperature is controlled to be 260-270 ℃, air cooling is carried out after hot rolling is finished, and the crystal grains of the blank are effectively refined, so that the static recrystallization of the blank at high temperature caused by overhigh finish 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 rate is more than 70 percent, so that the annealed grains can be effectively refined;
in conclusion, the 6-series aluminum alloy prepared by the preparation method provided by the invention has high strength and high fatigue performance.
A gas cylinder, the body of the gas cylinder is made of the 6-series aluminum alloy with high strength and high fatigue performance.
The preparation method of the gas cylinder comprises the following steps:
opening a 4.0mm aluminum alloy base material, blanking to form a circular sheet, stamping, forming by drawing twice, and closing to obtain an aluminum alloy seamless gas cylinder with required specification;
carrying out heat preservation on the aluminum alloy seamless gas cylinder at the temperature of 550-560 ℃ for 30-60min, and then carrying out spray water quenching treatment; then carrying out aging treatment at the temperature of 160-165 ℃ and keeping the temperature for 15-16 h.
Compared with the prior art, the gas cylinder provided by the invention has the following beneficial effects:
1. the 6-series aluminum alloy with high strength and high fatigue performance prepared by the method is used for preparing the gas cylinder, and the tensile strength of the gas cylinder can be ensured to be 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 in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, 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
A6-series aluminum alloy with high strength and high fatigue performance comprises the following preparation processes:
s1, preparing raw materials according to the following weight percentage: 0.73 to 0.78 percent of Si, less than or equal to 0.22 percent of Fe, 0.15 to 0.25 percent of Cu, less than or equal to 0.05 percent of Mn, 1.12 to 1.18 percent of Mg, 0.18 to 0.23 percent of Cr, less than or equal to 0.05 percent of Zn, 0.02 to 0.03 percent of Ti, less than or equal to 0.05 percent of Al and other inevitable elements, wherein the other inevitable elements are less than or equal to 0.05 percent, and the total is less than or equal to 0.15 percent;
s2, washing the furnace, namely, putting 99.70 percent of aluminum ingots for casting 6061 aluminum alloy into a smelting furnace for smelting, and emptying aluminum liquid after smelting for a period of time;
s3, smelting, namely putting 99.70% of aluminum ingots into a smelting furnace for smelting, smelting to obtain an aluminum alloy solution after the temperature in the smelting furnace reaches 760 ℃, and then transferring the aluminum alloy solution to a refining furnace; the Al content in the added aluminum ingot is more than 99.85 percent, and no returned aluminum material or waste aluminum material is added; the flow of argon introduced into the rotors I # and 3# of the molten aluminum refining furnace is 1.0 +/-0.2 m3The chlorine flow rate of the No. 2 rotor is 0.05 +/-0.0.01 m3The No. 4 rotor is not communicated with chlorine;
s4, refining, namely introducing chlorine and argon into the refining furnace for refining, refining the refining furnace twice, wherein each time of refining is 40 minutes, the middle of refining is kept stand for 60 minutes, and the refining furnace is kept stand for 30 minutes again when the hydrogen content of the melt is measured to be less than 0.25mL/100gA1 after the two times of refining are finished;
s5, degassing and filtering, wherein after S4 is completed, argon and chlorine are introduced into the degassing furnace for degassing, meanwhile, a grain refiner 5Ti-0.2B is added on line, and then a 30ppi ceramic filter plate and a 60ppi ceramic filter plate are sequentially adopted for two-stage filtering to obtain an aluminum alloy purifying solution; the hydrogen content in the aluminum alloy purifying liquid is less than 0.1mL/100gAl, and the inclusion content in the launder is less than 0.02mm2/kg；
S6, casting, namely after S5 is finished, casting the aluminum alloy purifying liquid subjected to slag skimming into an aluminum alloy ingot, wherein the thickness of the aluminum alloy ingot is 650 mm;
s7, carrying out homogenization heat treatment, namely, sawing and milling the aluminum alloy cast ingot obtained in the step S6, then placing the aluminum alloy cast ingot into a heating furnace for homogenization heat treatment, setting the furnace gas temperature of the heating furnace to 600 ℃, adjusting the furnace gas temperature of the heating furnace to 570 +/-3 ℃ when the metal temperature reaches 560 ℃, and carrying out heat preservation for 20 hours; sawing 300m at the bottom and 200mm at the top of the aluminum alloy ingot, cutting, taking a thickness of 20mm at the bottom, analyzing a microstructure by using a metallographic microscope under 250 times, and measuring the size of a residual second phase, wherein the average size of the second phase is less than 10 mu m, and the maximum size is less than 15 mu m; milling the upper surface and the lower surface of the surface by 15mm respectively, milling the side surface by 10mm respectively, and requiring smoothness and cleanness;
s8, hot rolling, namely, after ultrasonic flaw detection is carried out on the aluminum alloy cast ingot subjected to the homogenization heat treatment, carrying out hot rolling on the aluminum alloy cast ingot reaching the grade A or above, wherein during the hot rolling, the furnace temperature is preheated to 520 ℃, hot rough rolling is carried out after the temperature of the aluminum alloy cast ingot reaches 480 ℃, the thickness of the aluminum alloy cast ingot is 28.0mm, and hot finish rolling is carried out for one pass to 14.0mm to obtain a hot rolled strip; the final rolling temperature is 260 ℃, and air cooling is carried out after the hot rolling is finished;
and S9, cold rolling and annealing, namely, carrying out 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, carrying out complete annealing, keeping the annealing metal temperature at 360 +/-3 ℃ for 2h, carrying out annealing, and carrying out annealing treatment to obtain the aluminum alloy base material.
A gas cylinder, the body of the gas cylinder is made of the 6-series aluminum alloy with high strength and high fatigue performance.
The preparation method of the gas cylinder comprises the following steps:
opening a 4.0mm aluminum alloy base material, blanking to form a circular sheet, stamping, forming by drawing twice, and closing to obtain an aluminum alloy seamless gas cylinder with required specification;
carrying out heat preservation on the aluminum alloy seamless gas cylinder at the temperature of 550-560 ℃ for 30-60min, and then carrying out spray water quenching treatment; then carrying out aging treatment at the temperature of 160-165 ℃ and keeping the temperature for 15-16 h.
Comparative example 1
Comparative example 1 is substantially the same as the production method of example 1 except that in step S1, the amount of Mg added is 0.8 to 1.0% and the amount of Si added is 0.4 to 0.6%; i.e. the chemical composition configuration has a lower content of strengthening phase.
Comparative example 2
Comparative example 2 is substantially the same as the production method of example 1, except that the furnace washing step is not performed, and aluminum ingots are added in the melting step to contain waste aluminum materials; i.e., the substrate chemistry has a high level of impurities.
Comparative example 3
Comparative example 3 is substantially the same as the production method of example 1, except that when the homogenization heat treatment of step S7 is performed, the furnace gas temperature of the heating furnace is adjusted to 540 ± 3 ℃ and the temperature is kept for 20 hours when the metal temperature is controlled to 530 ℃; i.e. the homogenization heat treatment temperature is lower.
Comparative example 4
Comparative example 4 is substantially the same as the production method of example 1 except that in the finish hot rolling at the time of performing step S8, a 28.0mm thick slab is hot-rolled to a hot-rolled strip of 8.0mm thick in two passes; then, in step S9, the hot-rolled strip having a thickness of 8.0mm is subjected to multiple cold rolling to obtain a cold-rolled strip having a thickness of 4.0 mm. Namely, the total reduction rate of cold rolling is lower.
Comparative example 5
Comparative example 5 the production process was approximately the same as that of example 1, and the aging temperature was 180 ℃.
The conductive performance ultrasonic flaw detection results for the aluminum alloy substrates obtained in example 1 and comparative examples 1 to 5 are shown in the following table:
| 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 fracture% | 14 | 13.5％ | 14.0％ | 12.5％ | 14.5％ | 13.0％ |
| Number of cycles of fatigue | 16200 | 12800 | 12500 | 12500 | 13000 | 12700 |
The experimental data show that:
comparative example 1 because the content of the strengthening phase in the alloy composition is low, the final strength is low, and the fatigue cycle number is low;
comparative example 2 the fatigue cycle times were lower because of the higher impurity content in the alloy constituents;
comparative example 3 has a large second phase due to a low homogenization heat treatment temperature, resulting in a low number of fatigue cycles;
comparative example 4 the working rate between the hot rolled blank and the finished product thickness is low, resulting in slightly larger substrate grains and lower fatigue cycle times;
comparative example 5 has lower final strength and lower number of fatigue cycles 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 the aging temperature in the method of the invention has the precipitated phase in a dispersed, uniform and fine state during aging.
Although the present invention has been described in detail 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 in the foregoing embodiments, or equivalents may be substituted for elements thereof.
Claims (7)
1. The 6-series aluminum alloy with high strength and high fatigue performance is characterized by being prepared by the following steps:
s1, washing the furnace, namely, putting 99.70 percent of aluminum ingots into a smelting furnace for smelting, and emptying aluminum liquid after smelting for a period of time;
s2, smelting, namely putting the raw materials into a smelting furnace cleaned by S1, smelting to obtain molten aluminum alloy, and transferring the molten aluminum alloy to a refining furnace;
s3, refining, namely introducing chlorine and argon into the refining furnace for refining, refining the refining furnace twice, wherein each time of refining is 40 minutes, the middle of refining is kept stand for 60 minutes, and the refining furnace is kept stand for 30 minutes again when the hydrogen content of the melt is measured to be less than 0.25mL/100gAl after the two times of refining;
s4, degassing and filtering, wherein after S3 is completed, argon and chlorine are introduced into the degassing furnace for degassing, meanwhile, a grain refiner 5Ti-0.2B is added on line, and then a 30ppi ceramic filter plate and a 60ppi ceramic filter plate are sequentially adopted for two-stage filtering to obtain an aluminum alloy purifying solution; the hydrogen content in the aluminum alloy purifying liquid is less than 0.1mL/100gAl, and the inclusion content in the launder is less than 0.02mm2/kg；
S5, casting, namely after S4 is finished, casting the aluminum alloy purification liquid subjected to slag skimming into an aluminum alloy ingot, wherein the thickness of the aluminum alloy ingot is 650 mm;
s6, carrying out homogenization heat treatment, namely, sawing and milling the aluminum alloy cast ingot obtained in the step S5, then placing the aluminum alloy cast ingot into a heating furnace for homogenization heat treatment, setting the furnace gas temperature of the heating furnace to 600 ℃, adjusting the furnace gas temperature of the heating furnace to 570 +/-3 ℃ when the metal temperature reaches 560 ℃, and carrying out heat preservation for 20 hours;
s7, hot rolling, namely, after ultrasonic flaw detection is carried out on the aluminum alloy cast ingot subjected to the homogenization heat treatment, carrying out hot rolling on the aluminum alloy cast ingot meeting the requirement, wherein during the hot rolling, the furnace temperature is preheated to 520 ℃, hot rough rolling is carried out after the temperature of the aluminum alloy cast ingot reaches 480 ℃, the thickness of the aluminum alloy cast ingot is 28.0mm, and the aluminum alloy cast ingot is subjected to hot finish rolling for one pass until the thickness of the aluminum alloy cast ingot reaches 14.0mm to obtain a hot rolled strip; the final rolling temperature is 260-270 ℃, and air cooling is carried out after hot rolling is finished;
and S8, cold rolling and annealing, namely, carrying out 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, carrying out complete annealing, keeping the annealing metal temperature at 360 +/-3 ℃ for 2h, carrying out annealing, and carrying out annealing treatment to obtain the aluminum alloy base material.
2. The high-strength high-fatigue-performance 6-series aluminum alloy according to claim 1, wherein the raw materials comprise the following chemical components in percentage by mass: 0.73 to 0.78 percent of Si, less than or equal to 0.22 percent of Fe, 0.15 to 0.25 percent of Cu, less than or equal to 0.05 percent of Mn, 1.12 to 1.18 percent of Mg, 0.18 to 0.23 percent of Cr, less than or equal to 0.05 percent of Zn, 0.02 to 0.03 percent of Ti, less than or equal to 0.05 percent of Al and other inevitable elements, wherein the other inevitable elements are less than or equal to 0.05 percent, and the total is less than or equal to 0.15 percent.
3. The high-strength high-fatigue-performance 6-series aluminum alloy according to claim 1, wherein: when the raw material is 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.
4. The high-strength high-fatigue-performance 6-series aluminum alloy according to claim 1, wherein: in the S3, the argon flow rate of the rotors No. 1 and No. 3 of the molten aluminum refining furnace is 1.0 +/-0.2 m3The chlorine flow rate of the No. 2 rotor is 0.05 +/-0.0.01 m3And h, the No. 4 rotor is not communicated with chlorine gas.
5. The high-strength high-fatigue-performance 6-series aluminum alloy according to claim 1, wherein:
the sawing and milling process in the S6 comprises the steps of sawing 300m of the bottom and 200mm of the top of an aluminum alloy ingot, cutting the ingot, taking the ingot 20mm thick at the bottom, analyzing a microstructure by using a metallographic microscope under 250 times, and measuring the size of a residual second phase, wherein the average size of the second phase is less than 10 mu m, and the maximum size is less than 15 mu m; milling 15mm on the upper surface and 15mm on the lower surface respectively, milling 10mm on the side surface respectively, and requiring smoothness and cleanness;
and the ultrasonic flaw detection requirement of the aluminum alloy cast ingot in the S7 reaches above grade A.
6. A gas cylinder, characterized in that: the cylinder body of the gas cylinder is made of the 6-series aluminum alloy with high strength and high fatigue performance according to claim 1.
7. A preparation method of a gas cylinder, comprising the gas cylinder of claim 6, wherein the specific preparation process of the gas cylinder is as follows:
opening a 4.0mm aluminum alloy base material in sequence, blanking to prepare a circular sheet, stamping to form, drawing twice, and then closing to prepare an aluminum alloy seamless gas cylinder with a required specification;
carrying out heat preservation on the aluminum alloy seamless gas cylinder at the temperature of 550-560 ℃ for 30-60min, and then carrying out spray water quenching treatment; then carrying out aging treatment at the temperature of 160-165 ℃ and keeping the temperature for 15-16 h.
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