CN114653771A - Production method of green circulating grade-guaranteeing 6-series high-forming automobile plate - Google Patents
Production method of green circulating grade-guaranteeing 6-series high-forming automobile plate Download PDFInfo
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- CN114653771A CN114653771A CN202210124324.0A CN202210124324A CN114653771A CN 114653771 A CN114653771 A CN 114653771A CN 202210124324 A CN202210124324 A CN 202210124324A CN 114653771 A CN114653771 A CN 114653771A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000002699 waste material Substances 0.000 claims abstract description 35
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 32
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 17
- 230000008018 melting Effects 0.000 claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000003801 milling Methods 0.000 claims abstract description 13
- 238000007670 refining Methods 0.000 claims abstract description 11
- 238000004321 preservation Methods 0.000 claims abstract description 9
- 238000007872 degassing Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000005098 hot rolling Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000005097 cold rolling Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000005070 sampling Methods 0.000 claims abstract description 3
- 239000002516 radical scavenger Substances 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000002893 slag Substances 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000004512 die casting Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
-
- 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
-
- 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
-
- 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
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A production method of a green circulating grade-keeping 6-series high-forming automobile plate comprises the following steps: the method comprises the following steps: adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system for melting, and sampling and detecting chemical components after the melting is finished; step two: reducing the high elements in the alloy to at least the upper limit of the process requirement by using an element remover; step three: transferring the molten aluminum into a smelting furnace according to a charging proportion of 60-90%, and carrying out alloy proportioning on the smelting furnace according to alloy components of 6-series high-forming automobile plates; step four: transferring the alloy liquid into a heat preservation furnace for refining; step five: carrying out on-line deslagging, degassing and filtering treatment, and casting a large flat ingot; step six: milling eight surfaces of a large flat ingot; step seven: homogenizing the large flat ingot; step eight: hot rolling to 3-10 mm, and then cold rolling to 1.5-2.5 mm; step nine: and (5) carrying out solution treatment, and cooling in air to room temperature to obtain a finished product. The invention can effectively carry out green recycling grade-guaranteeing use on the recovered waste automobile plates, and brings more economic and social benefits to enterprises.
Description
Technical Field
The invention belongs to the field of automobile plate production in aluminum processing industry, and particularly relates to a production method of a green circulating grade-keeping 6-series high-forming automobile plate.
Background
People pay more and more attention to environmental pollution, energy consumption is increasingly aggravated and the like, and automobile manufacturing puts higher demands on light weight of automobile bodies. On the premise of ensuring the safety of the automobile, the application of the aluminum plate on the automobile reduces the weight of the automobile body and reduces the emission of the automobile. Domestic automobile plate aluminum processing enterprises do not yet carry out automobile plate aluminum scrap recycling, and automobile host factory packs the aluminum scrap after using and sells to general aluminum scrap recycling enterprise at a low price, degrades original automobile plate alloy and uses to the die casting, does not really effectually carry out the aluminum scrap after the automobile plate uses and recycles.
Disclosure of Invention
The invention provides a production method of a green circulating grade-keeping 6-series high-forming automobile sheet, which is used for overcoming the defects in the prior art.
The invention is realized by the following technical scheme:
a production method of a green circulating grade-guaranteeing 6-series high-forming automobile plate comprises the following steps:
the method comprises the following steps: adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system for melting, wherein the melting temperature is 690-765 ℃, and sampling and detecting chemical components after melting is finished;
step two: according to the detection result of the chemical components in the step one, an element remover is used for reducing high elements in the alloy to the upper limit of the process requirement;
step three: transferring molten aluminum melted by the waste treatment system into a smelting furnace according to a charging proportion of 60-90%, wherein the smelting furnace carries out alloy proportioning according to alloy components of 6-series high-forming automobile plates, and the smelting temperature is 690-765 ℃;
step four: transferring the alloy liquid smelted in the step four into a heat preservation furnace for refining, wherein the refining temperature is 700-760 ℃, and the refining time is 20-90 min;
step five: carrying out online deslagging, degassing and filtering treatment, and casting a large flat ingot at 685-715 ℃ at a casting speed of 45-55 mm/min;
step six: milling the large flat ingot into eight surfaces, wherein the milling amount of the large surface is 10-25 mm, and the milling amount of the small surface is 3-15 mm;
step seven: homogenizing the large flat ingot, wherein the homogenizing temperature is 520-585 ℃, and the heat preservation time is 3-20 h;
step eight: opening the furnace for rolling when the heating furnace is heated to 510 ℃, performing hot rolling at the final rolling temperature of 300-360 ℃, and performing cold rolling to 1.5-2.5 mm, wherein the final thickness is 3-10 mm;
step nine: and carrying out solution treatment for 10-55 s at the temperature of 520-550 ℃, and air-cooling to room temperature to obtain a finished product.
The production method of the green cycle grade 6 series high-profile automobile sheet comprises the following steps of: 0-1.20% of Si; 0-0.35% of Fe; 0-0.13% of Cu; 0-0.30% of Mn; 0-0.65% of Mg; 0-0.05% of Cr; 0-0.05% of Zn; 0 to 0.05 percent of Ti.
The production method of the green cycle grade 6 series high-profile automobile sheet comprises the following steps:
in the method for producing the green cycle grade 6 series high-molding automobile sheet, the element scavenger in the second step is added with the high-melting-point element scavenger firstly and then the low-melting-point element scavenger.
According to the method for producing the green recycling grade 6 series high-forming automobile sheet, in the second step, the element scavenger is required to be added once every time the waste aluminum is added by the waste material treatment system, and the adding amount of the element scavenger is determined according to the detection content condition of each element of the batch of waste aluminum.
The production method of the green cycle grade 6 series high-profile automobile sheet comprises the following steps of: 0.80-1.20% of Si; 0.10-0.35% of Fe; 0.03-0.13% of Cu; 0.05-0.30% of Mn; 0.20-0.65% of Mg; 0.01-0.05% of Cr; 0.01-0.05% of Zn; 0.02 to 0.05 percent of Ti.
The invention has the advantages that: the invention recycles the high-forming aluminum scrap recovered by a main engine plant, the recovered aluminum scrap is directly added into a smelting furnace by the traditional production process, the production process classifies the recovered 6-series high-forming alloy for use, then the impurity removal and element reduction treatment is carried out by a waste treatment system, so that the alloy components meet the formulated process requirements, and the production is carried out by the smelting furnace through a converter, namely smelting, refining, online degassing and deslagging, filtering, casting, hot rolling, cold rolling and continuous annealing. The recovered waste automobile plates are produced according to 60%, 90% and 90% of the charging amount of the recovered waste materials of the main engine plant and 10% of the self-produced waste aluminum. All indexes of the produced automobile plate meet the use requirements of a host factory. The recovered waste automobile plates can be effectively recycled and used in a green and recycling manner, and more economic and social benefits are brought to enterprises.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a performance test report for example 1 of the present invention;
FIG. 2 is a report of performance test of example 2 of the present invention;
fig. 3 is a performance test report of embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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
1.1, adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system at 750 ℃ for melting, wherein the mass ratio of the chemical components detected after melting is as follows: si, 1.15%; 0.30 percent of Fe; 0.066% of Cu; 0.21% of Mn; 0.65% of Mg; 0.017 percent of Cr; zn, 0.012%; 0.015% of Ti.
1.2 adding the qualified recycled aluminum water in the waste treatment system into a 750 ℃ smelting furnace according to the charging amount of 60 percent and melting the recycled aluminum water together with electrolytic aluminum water, a re-melted ingot and an intermediate alloy in a proportion of 40 percent. And an electromagnetic stirrer is used to achieve the uniformity of chemical components in the smelting furnace. The chemical components in mass ratio are as follows: 0.93 percent of Si; 0.25 percent of Fe; 0.07% of Cu; 0.20 percent of Mn; 0.47% of Mg; 0.032% of Cr; 0.023 percent of Zn; 0.018% of Ti.
1.3, the molten aluminum in the smelting furnace is transferred to a 745 ℃ heat preservation furnace for refining for 55 minutes, and the processes of online deslagging, degassing and filtering are carried out.
1.3.1 slag content
1.3.2 the slag content is one of indexes for measuring the quality and cleanliness of the melt, and the actual detection meets the process requirements.
1.4 casting machine casting was carried out at a casting temperature of 693 ℃ and a speed of 53 mm/min.
1.5 milling the large surface of a large flat ingot for 15mm and milling the small surface for 5mm, preserving the heat of 540 ℃ in a heating furnace for 5 hours, opening the furnace for rolling at 510 ℃, and performing hot rolling at the final rolling temperature of 320 ℃ and the thickness of 7 mm.
1.6 the thickness of the cold-rolled finished product is 1.5mm, the solution treatment is carried out for 50s at the temperature of 545 ℃, and the finished product is obtained after air cooling to the room temperature.
Example 2
2.1 adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system at 750 ℃ for melting, wherein the mass ratio of the chemical components detected after melting is as follows: si, 1.13%; 0.29 percent of Fe; 0.067% of Cu; 0.23 percent of Mn; 0.63% of Mg; 0.016 percent of Cr; 0.015% of Zn; 0.014% of Ti.
2.2 adding the molten recycled aluminum water in the waste treatment system into a 755 ℃ smelting furnace according to 90 percent of charging amount and melting the molten recycled aluminum water, the remelted ingot and the master alloy together with 10 percent of electrolytic aluminum water. And the electromagnetic stirrer is used to achieve the uniformity of chemical components in the smelting furnace. The chemical components in mass ratio are as follows: si, 1.09%; 0.28 percent of Fe; 0.09% of Cu; 0.21% of Mn; 0.46% of Mg; 0.018% of Cr; 0.017% of Zn; 0.015% of Ti.
2.3, the molten aluminum in the smelting furnace is transferred to a 745 ℃ heat preservation furnace for refining for 65 minutes, and the processes of online deslagging, degassing and filtering are carried out.
2.3.1 slag content
2.3.2 the slag content is one of the standards for measuring the quality and cleanliness of the melt, and the actual detection meets the process requirements.
2.4 casting machine casting was carried out at a casting temperature of 696 ℃ and a speed of 55 mm/min.
2.5 milling the large surface of the large flat ingot for 15mm and milling the small surface for 5mm, preserving the heat of the large flat ingot for 6 hours at 550 ℃ in a heating furnace, opening the furnace for rolling at 510 ℃, and performing hot rolling at the finishing temperature of 340 ℃ to obtain the large flat ingot with the thickness of 9.0 mm.
2.6 the thickness of the cold-rolled finished product is 2.0mm, the solution treatment is carried out for 48s at the temperature of 550 ℃, and the finished product is obtained after air cooling to the room temperature.
Example 3
3.1 adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system at 750 ℃ for melting, wherein the mass ratio of the chemical components detected after melting is as follows: si, 1.11%; 0.31 percent of Fe; 0.068% of Cu; 0.24% of Mn; 0.59 percent of Mg; 0.015 percent of Cr; 0.013% of Zn; 0.013% of Ti.
3.2 adding the molten recycled aluminum water in the waste treatment system into a 755 ℃ smelting furnace according to the charging amount of 90 percent and melting the molten recycled aluminum water together with 10 percent of other alloy self-produced waste. And the electromagnetic stirrer is used to achieve the uniformity of chemical components in the smelting furnace. The chemical components in mass ratio are as follows: 1.18 percent of Si; 0.33 percent of Fe; 0.12% of Cu; 0.28% of Mn; 0.57% of Mg; 0.017 percent of Cr; 0.018% of Zn; 0.016 percent of Ti.
3.3, transferring the molten aluminum in the smelting furnace to a 745 ℃ heat preservation furnace for refining for 75 minutes, and performing online deslagging, degassing and filtering treatment.
3.3.1 slag content
3.3.2 the slag content is one of the standards for measuring the quality and cleanliness of the melt, and the actual detection meets the process requirements.
3.4 casting machine casting was carried out at a casting temperature of 701 ℃ and a speed of 58 mm/min.
3.5 milling the large surface of the large flat ingot for 15mm and milling the small surface for 5mm, preserving the heat in a heating furnace for 8 hours at 560 ℃, opening the furnace for rolling at 510 ℃, and performing hot rolling at the final rolling temperature of 350 ℃ and the thickness of 9.5 mm.
3.6 the thickness of the cold-rolled finished product is 2.5mm, the solution treatment is carried out for 40s at the temperature of 565 ℃, and the finished product is obtained after air cooling to the room temperature.
As shown in the figures 1-3, the invention has the advantages that the performance of the prepared 6-series high-formability automobile sheet meets the standard, the cleanness of aluminum liquid is improved by the smelting process through the recycled 6-series high-formability alloy automobile sheet waste aluminum, the recycled waste automobile sheet is produced according to 60 percent, 90 percent of usage amount, 90 percent of recycled waste and 10 percent of self-produced waste aluminum, and the waste aluminum is recycled for use again for preservation. The field of recycling protection again uses the 6 high fashioned useless car boards of system of host computer factory to the automobile board, no longer degrades useless car board and uses the die casting, accomplishes green high-efficient circular economy.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A production method of a green circulating grade-keeping 6-series high-forming automobile plate is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: adding the recycled high-molding 6-series automobile sheet waste into a waste treatment system for melting, wherein the melting temperature is 690-765 ℃, and sampling and detecting chemical components after melting is finished;
step two: according to the detection result of the chemical components in the step one, an element remover is used for reducing the high elements in the alloy to at least the upper limit of the process requirement;
step three: transferring molten aluminum melted by the waste treatment system into a smelting furnace according to a charging proportion of 60-90%, wherein the smelting furnace carries out alloy proportioning according to alloy components of 6-series high-forming automobile plates, and the smelting temperature is 690-765 ℃;
step four: transferring the alloy liquid smelted in the step four into a heat preservation furnace for refining, wherein the refining temperature is 700-760 ℃, and the refining time is 20-90 min;
step five: carrying out online deslagging, degassing and filtering treatment, and casting a large flat ingot at the casting temperature of 685-715 ℃ and the casting speed of 45-55 mm/min;
step six: milling the large flat ingot into eight surfaces, wherein the milling amount of the large surface is 10-25 mm, and the milling amount of the small surface is 3-15 mm;
step seven: homogenizing the large flat ingot, wherein the homogenizing temperature is 520-585 ℃, and the heat preservation time is 3-20 h;
step eight: opening the furnace for rolling when the heating furnace is heated to 510 ℃, performing hot rolling at the final rolling temperature of 300-360 ℃, and performing cold rolling to 1.5-2.5 mm, wherein the final thickness is 3-10 mm;
step nine: and carrying out solution treatment at the temperature of 520-550 ℃ for 10-55 s, and air cooling to room temperature to obtain a finished product.
2. The method for producing green cycle grade 6 series high-profile automobile sheet according to claim 1, wherein the method comprises the following steps: the content of each element in the second step is defined as: 0-1.20% of Si; 0-0.35% of Fe; 0-0.13% of Cu; 0-0.30% of Mn; 0-0.65% of Mg; 0-0.05% of Cr; 0-0.05% of Zn; 0 to 0.05 percent of Ti.
3. The method for producing green cycle grade 6 series high-profile automobile sheet according to claim 1, wherein the method comprises the following steps: and the element scavenger in the second step is used in the sequence of adding the high-melting-point element scavenger and then adding the low-melting-point element scavenger.
4. The method for producing a green cycle grade 6 series high-profile automobile sheet according to claim 1, wherein the method comprises the following steps: and in the second step, the element scavenger is required to be added once when the waste aluminum is added once by the waste treatment system, and the adding amount of the element scavenger is determined according to the detection content condition of each element of the batch of waste aluminum.
5. The method for producing a green cycle grade 6 series high-profile automobile sheet according to claim 1, wherein the method comprises the following steps: the alloy components of the 6-series high-formability automobile sheet in the third step comprise the following substances in percentage by weight: 0.80-1.20% of Si; 0.10-0.35% of Fe; 0.03-0.13% of Cu; 0.05-0.30% of Mn; 0.20-0.65% of Mg; 0.01-0.05% of Cr; 0.01-0.05% of Zn; 0.02 to 0.05 percent of Ti.
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| CN202210124324.0A CN114653771A (en) | 2022-02-10 | 2022-02-10 | Production method of green circulating grade-guaranteeing 6-series high-forming automobile plate |
| PCT/CN2023/070807 WO2023151433A1 (en) | 2022-02-10 | 2023-01-06 | Environmentally friendly recycling grade-maintaining production method for 6-series high-formability automobile plate |
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| CN202210124324.0A CN114653771A (en) | 2022-02-10 | 2022-02-10 | Production method of green circulating grade-guaranteeing 6-series high-forming automobile plate |
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| WO2023151433A1 (en) * | 2022-02-10 | 2023-08-17 | 山东南山铝业股份有限公司 | Environmentally friendly recycling grade-maintaining production method for 6-series high-formability automobile plate |
| CN115233014A (en) * | 2022-07-22 | 2022-10-25 | 山东南山铝业股份有限公司 | Production method for recycling tank cover material for automobile plate |
| CN115216664A (en) * | 2022-07-27 | 2022-10-21 | 山东南山铝业股份有限公司 | Production method of circulation grade-keeping 3-series tank material |
| CN115233000A (en) * | 2022-07-27 | 2022-10-25 | 山东南山铝业股份有限公司 | Production method for recycling tank body material for automobile plate |
| CN115233005A (en) * | 2022-08-04 | 2022-10-25 | 山东南山铝业股份有限公司 | Production method of circulation grade-keeping 3-series unscrewing cover material |
| CN115216662A (en) * | 2022-08-18 | 2022-10-21 | 山东南山铝业股份有限公司 | Production method of circulation-guaranteed 8-series unscrewing cover material |
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| WO2023151433A1 (en) | 2023-08-17 |
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