CN106086489A - The method of a kind of width is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom - Google Patents
The method of a kind of width is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom Download PDFInfo
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- CN106086489A CN106086489A CN201610686184.0A CN201610686184A CN106086489A CN 106086489 A CN106086489 A CN 106086489A CN 201610686184 A CN201610686184 A CN 201610686184A CN 106086489 A CN106086489 A CN 106086489A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/119—Refining the metal by filtering
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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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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Abstract
The method of a kind of width is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, belongs to metal working technical area.The present invention comprises the steps: (1) dispensing；(2) melting；(3) insulation, refine, standing；(4) online refine；(5) crystal grain refinement；(6) filter；(7) casting；(8) soaking.The present invention employs chamfer crystallizer during casting, width is adjustable, utilization rate of equipment and installations can be improved, saving equipment and maintenance cost, reduce slab ingot milling amount, improve yield rate, it is achieved that flakiness ratio reaches 4.13 4.67, slab ingot width reaches the aluminium alloy flat bloom of 2270 2570mm sizes, can meet different customer demand.
Description
Technical field
The present invention relates to the casting method of a kind of aluminium alloy flat bloom, cast particularly to the adjustable chamfer crystallizer of one width
The method making big flakiness ratio aluminium alloy flat bloom.
Background technology
In commercial production, easily there is more defect in casting aluminium alloy flat bloom, as composition exceeds standard thick with segregation, grain size
Greatly, oxide is mingled with, bubble, shrinkage porosite, surface segregation tumor, crackle, ingot tail subside the defects such as entire crack, cause yield rate to be difficult to protect
Barrier.Especially casting big specification slab ingot, its corner easily enters the 3rd brittle zone under the effect of two dimension cooling zone, thus produces a large amount of
Corner crack defect, current solution is to use the crystallizer of band circular arc and to electromagnetic casting, wagstaff and low
The regulation and control of liquid level casting process and improvement.
Circular arc crystallizer can alleviate right angle crystallizer edge transverse crack, but its difficulty of processing is big, and size is difficult to ensure card, rear
Continue in safeguarding relatively costly.Meanwhile, the circular arc slab ingot cast out milling amount when milling is bigger, and yield rate is low.Electromagnetic casting is adopted
With electromagnetic crystallizer, the ingot macrostructure's fine uniform cast out, smooth surface, segregation layer are thin, but due to its technical equipment
With patent royalties with high, commercial production is applied the most extensive.Wagstaff and low liquid level casting method are used aborning
Relatively wide, due to cooling water quality, discharge, casting temperature, temperature of aluminum liquid and the ingot casting in casting and crystallizer kind with
Specification is different, and the aluminium alloy flat bloom quality that actual casting goes out is the most uniform and stable, and a large amount of waste products easily occurs in casting.Conventional cast
Using fixed crystallizer casting in processing, width is single, and utilization rate of equipment and installations is low.
Summary of the invention
The invention aims to solve the deficiency that above-mentioned prior art exists, it is provided that chamfering that one width is adjustable is tied
The method of brilliant device casting big flakiness ratio aluminium alloy flat bloom.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows: chamfer crystallizer casting that one width is adjustable
The method of big flakiness ratio aluminium alloy flat bloom, specifically includes following steps:
(1) dispensing: calculate remelting aluminium ingot according to subject alloy composition and return material and the consumption of each intermediate alloy, returning material
The mass percent accounting for total input amount is 0-80%, weighs raw material；
(2) melting: raw material puts into smelting furnace, smelting temperature is 680-760 DEG C, stirring, obtains aluminium alloy melt after melting, will
Aluminium alloy melt tuberculosis is to holding furnace；
(3) insulation, refine, standing: the aluminium alloy melt in holding furnace is passed through Ar-Cl2Mixed gas carries out refine, argon with
It is 4-60:1 that chlorine is passed through the volume ratio of flow, and refining time is 10-50 minute, quiet to aluminium alloy melt at holding furnace after refine
Put 10-60 minute；
(4) online refine: the aluminium alloy melt after using online refinery by de-gassing device to stand step (3) insulation carries out refine,
Being passed through chlorine and argon, it is 7-80:1 that argon and chlorine are passed through the volume ratio of flow, and the rotor speed controlling gas flowmeter is
100-650Rpm, refining temperature is 700-735 DEG C, obtains the aluminium alloy melt after refine, in the aluminium alloy melt after refine
Hydrogen concentration≤0.12mg/100g；
(5) crystal grain refinement: add Al-Ti-B silk in the aluminium alloy melt after step (4) refine continuously and carry out at crystal grain refinement
Reason, adding speed is 80-150 cm/min, obtains the aluminium alloy melt after crystal grain refinement；
(6) on-line filtration: the aluminium alloy melt obtaining step (5) carries out filter cleaner；
(7) casting: after filtering in step (6), the aluminium alloy melt wide cut range of accommodation of gained is 2270-2570 mm, wide
Thickness rate scope is the chamfer crystallizer casting of 4.13-4.67, and controlling cast temperature is 680～720 DEG C, and discharge is 10-90
m2/ h, hydraulic pressure is 2.0-7.0 bar, and casting speed is 20-55 mm/min, obtains aluminium alloy flat bloom semi-finished product；
(8) soaking: the aluminium alloy flat bloom semi-finished product after casting are carried out equal heat treatment, obtains aluminium alloy flat bloom.
In technique scheme, described step (2) also includes the process of aluminium alloy melt composition adjustment: stove thrown by all raw materials
After, melting 5-20 minute again after smelting temperature arrives 710-～740 DEG C, take aluminium alloy melt and detect, according to detection knot
Alloys components is adjusted by fruit, supplements raw material to smelting furnace and continues fusing, when reaching subject alloy composition, will melt
The aluminium alloy melt tuberculosis obtained after one-tenth is to holding furnace.
Technique scheme, in described step (2), uses magnetic stirrer to be stirred during stirring.
Technique scheme, in described step (6), filter type uses 20-50ppi foamed ceramic filter plate to carry out
Filter.
Technique scheme, in described step (8), equal hot mode is single-stage soaking or twin-stage soaking, can effectively eliminate
Slab ingot dendritic segregation.
In technique scheme, described aluminium alloy flat bloom flakiness ratio is 4.13-4.67, and width dimensions is 2270-2570mm.
In technique scheme, the described material that returns includes the milling tailing of aluminium alloy flat bloom, processes underproof aluminium alloy
Slab ingot etc..
Beneficial effect: the method for present invention width is adjustable chamfer crystallizer casting aluminium alloy flat bloom, by aluminium alloy
The adjustment of bath composition, can accurately control aluminium alloy flat bloom composition；Select suitable refinery by de-gassing technological parameter, can effectively control
The chemical composition content of aluminium alloy flat bloom, hydrogen content and impurity content, improve aluminium alloy flat bloom mass defect, effectively prevent tradition
The casting flaws such as the casting crack that occurs in method, surface segregation tumor, grain size are thick, improve casting success ratio.
The present invention uses chamfer crystallizer to replace circular arc crystallizer, and wide cut range of accommodation is 2270-2570mm, and width is adjustable
Scope is big, can improve utilization rate of equipment and installations, saves equipment and maintenance cost, and size facilitates milling, reduces slab ingot milling amount, improves into
Product rate, it is achieved that flakiness ratio reaches 4.13-4.67, slab ingot width reaches the aluminium alloy flat bloom of 2270-2570mm size, can meet difference
Customer demand.
The present invention, in the course of processing of aluminium alloy, uses 20-50ppi foamed ceramic filter plate to aluminum before casting process
Alloy molten solution filters.The quality that molten aluminium alloy processes influences whether the product quality of ingot casting, and then has influence on follow-up adding
The product quality of work material, therefore, aluminium melting liquid filtrate technology is a ring important in aluminum processing material production technology.Although depassing unit
Also partly can go the removal of impurity, for high-precision production, its requirement to casting product quality can not be met far away.Pass through
The filtration to molten aluminium alloy of the 30-40ppi ceramic filter plate, the aluminium alloy flat bloom quality that can make follow-up casting is high, improves finished product
Rate.
The present invention solves traditional fixed crystallizer, and to produce aluminium alloy flat bloom generous smaller and strengthen follow-up rolling
Difficulty with increase the problems such as edge and waste material end to end, fixed crystallizer width is single, utilization rate of equipment and installations is low.
Accompanying drawing explanation
Fig. 1 a, Fig. 1 b are 5182 aluminium alloy flat bloom finished figures.
Fig. 2 a is the micro-organization chart at 5182 aluminum alloy core positions.
Fig. 2 b is the micro-organization chart at 5182 aluminium alloy 1/4 diagonal positions.
Fig. 2 c is the micro-organization chart of 5182 aluminium alloy edges.
Fig. 3 a is the micro-organization chart at 3003 aluminum alloy core positions.
Fig. 3 b is the micro-organization chart at 3003 aluminium alloy 1/4 diagonal positions.
Fig. 3 c is the micro-organization chart of 3003 aluminium alloy edges.
Detailed description of the invention
Embodiment 1:
Produce 5182 alloys of 2570 × 550 mm specifications, carry out as follows:
One, dispensing: be Si:0.05-0.20%, Fe:0.10-0.35%, Cu:0.01-0.14%, Mn:0.20-by mass fraction
0.45%, Mg:4.20-4.80%, Cr:0.01-0.09%, Zn:0.01-0.25%, surplus is aluminum, weighs remelting aluminium ingot, return
Material, pure Mg ingot, pure Zn ingot, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, Al-
Cr intermediate alloy, the aluminum purity of remelting aluminium ingot is 99.70%, and strict control remelting aluminium ingot and 5xxx system revert are used
Amount, 5xxx revert consumption accounts for throwing stove total amount 0-80%.
Two, melting: raw material step one weighed puts in 50T smelting furnace, uses electromagnetic agitation under the conditions of 690-750 DEG C
Device stir-melting.Furnace rear thrown by all alloys, melting 5-20 minute again after smelting temperature arrives 710-～740 DEG C, takes melt and enters
Row direct reading spectrometry is tested, and is adjusted alloys components according to testing result, supplements raw material to smelting furnace and continues fusing, when reaching
During to subject alloy composition, the aluminium alloy melt obtained.By the adjustment to al alloy component, can accurately control slab ingot composition,
Improve slab ingot mass defect, improve casting success ratio.
Three, insulation, refine, standing: aluminium alloy melt tuberculosis step 2 obtained, to 60T holding furnace, uses Ar-Cl2Mixed
Closing gas refinement, the volume ratio being passed through argon and chlorine flowrate is 4-60:1, and refining time is 10-50 minute, after refine terminates
Stand 10-60 minute.
Four, online refine: stood backward motion holding furnace and enabled aluminum alloy to melt and flow through online refining controlling device, be passed through
Argon and chlorine, argon is 7-80:1 with the volume ratio of chlorine flowrate, and the rotor speed controlling gas flowmeter is 100-
650Rpm, refinery by de-gassing temperature is 700-735 DEG C.Hydrogen concentration≤0.12mg/100g in aluminium alloy melt, aluminium alloy after refine
Oxide, non-metallic inclusion and other harmful metal impurity in melt substantially reduce, and can effectively prevent casting crack, surface
The casting flaws such as pile displacement, grain size are thick.
Five, crystal grain refinement: the aluminium alloy melt after step 4 refine enters into chute, connects in chute by wire feeder
The continuous Al-Ti-B silk that adds carries out crystal grain micronization processes, and feeding wire speed controls to be 80-150 cm/min, obtains the aluminum after refine and closes
Gold liquation.
Six, filter: with 40ppi foamed ceramic filter plate by the molten aluminium alloy filter cleaner of step 5 gained.
Seven, casting: the molten aluminium alloy wide cut range of accommodation after filtering in step 6 is 2270-2570 mm, generous
The ratio chamfer crystallizer casting that scope is 4.13-4.67, cast temperature is 690～710 ° of C；Discharge is 10-85m2/ h, hydraulic pressure
For 2.0-4.5bar；Casting speed is 30-50mm/min；Aluminum liquid distribution pouch specification: 6 × 5 × 18inch, obtains aluminium alloy flat bloom
Semi-finished product.
Eight, soaking: aluminium alloy flat bloom semi-finished product carry out twin-stage soaking, and first order holding temperature 400-440 DEG C, during insulation
Between 2-4h；Second level holding temperature 490-530 DEG C, temperature retention time 10-15h.
Cast out 5182 alloy flat blooms of 2570 × 550 × 8000mm specification by above-mentioned steps, flakiness ratio is 4.67, crystal grain
Degree is one-level.
Embodiment 2:
Produce 3003 alloys of 2470 × 550mm specification, carry out as follows:
One, dispensing: be Si:0.05-0.60%, Fe:0.05-0.70%, Cu:0.05-0.18%, Mn:1.10-by mass fraction
1.40%, Mg:0.01-0.04%, Zn:0.01-0.09%, surplus is aluminum, weighs remelting aluminium ingot, returns material, pure Mg ingot, pure Zn
Ingot, Al-Si intermediate alloy, Al-Fe intermediate alloy, Al-Cu intermediate alloy, Al-Mn intermediate alloy, the aluminum purity of remelting aluminium ingot
Being 99.70%, accurately control remelting aluminium ingot and 3xxx system revert consumption, it is total that 3xxx system revert consumption accounts for throwing stove
The 0-80% of amount.
Two, melting: raw material step one weighed puts in 50T smelting furnace, uses electromagnetic agitation under the conditions of 700-760 DEG C
Device stir-melting.Furnace rear thrown by all alloys, melting 5-20 minute again after smelting temperature arrives 710-～740 DEG C, takes melt and enters
Row direct reading spectrometry is tested, and is adjusted alloys components according to testing result, supplements raw material to smelting furnace and continues fusing, when reaching
During to subject alloy composition, the aluminium alloy melt obtained.
Three, insulation, refine, standing: aluminium alloy melt tuberculosis step 2 obtained, to 60T holding furnace, uses Ar-Cl2Mixed
Closing gas refinement, the volume ratio being passed through argon and chlorine flowrate is 10-50:1, and refining time is 10-50 minute, after refine terminates
Stand 10-60 minute.
Four, online refine: stood backward motion holding furnace and enabled aluminum alloy to melt and flow through online refining controlling device, be passed through
Argon and chlorine, argon is 7-80:1 with the volume ratio of chlorine flowrate, and the rotor speed controlling gas flowmeter is 400-
600Rpm, refinery by de-gassing temperature 700-735 DEG C.
Five, crystal grain refinement: the aluminium alloy melt after step 4 refine enters into chute, connects in chute by wire feeder
The continuous Al-Ti-B silk that adds carries out crystal grain micronization processes, and feeding wire speed controls to be 80-130 cm/min, obtains the aluminum after refine and closes
Gold liquation.
Six, filter: with 30ppi foamed ceramic filter plate by the molten aluminium alloy filter cleaner of step 5 gained.
Seven, casting: the molten aluminium alloy wide cut range of accommodation after filtering in step 6 is 2270-2570 mm, generous
The ratio chamfer crystallizer casting that scope is 4.13-4.67, cast temperature is 680～720 ° of C；Discharge is 15-90m2/ h, hydraulic pressure
For 1.5-5.5bar；Casting speed is 20-55mm/min；Aluminum liquid distribution pouch specification: 6 × 5 × 18inch, obtains aluminium alloy flat bloom
Semi-finished product.
Eight, soaking: aluminium alloy flat bloom semi-finished product are carried out single-stage soaking, equal heat treatment holding temperature is 590-620 DEG C,
Temperature retention time is 8-25h.
Cast out 3003 alloy flat blooms of 2470 × 550 × 8100mm specification by above-mentioned steps, flakiness ratio reaches 4.49, crystal grain
Degree is one-level.
From Fig. 1 a and Fig. 1 b it can be seen that 5182 aluminium alloy flat bloom surfaces using enforcement 1 to be produced are the most smooth, without casting
Make the casting flaw such as crackle, surface segregation tumor.
Fig. 2 a, 2b, 2c are respectively the centre of 5182 aluminium alloys, the 1/4 diagonal portion using embodiment 1 to be produced
Position, the micro-organization chart of edge, grain size testing result is: slab ingot centre crystal grain level index is that G1.5(is average
A size of 210 μm), without burn-off phenomenon；Slab ingot 1/4 diagonal position crystal grain level index be G2.0(average-size be 180 μm),
Without burn-off phenomenon；Slab ingot edge crystal grain level index be G3.5(average-size be 105 μm), without burn-off phenomenon.This product
Without burn-off phenomenon, grain size is less, and quality is good.
Fig. 3 a, 3b, 3c are respectively the centre of 3003 aluminium alloys, the 1/4 diagonal portion using embodiment 2 to be produced
Position, the micro-organization chart of edge, grain size testing result is: slab ingot centre crystal grain level index is that G1.0(is average
A size of 250 μm), without burn-off phenomenon；Slab ingot 1/4 diagonal position crystal grain level index be G1.5(average-size be 210 μm),
Without burn-off phenomenon；Slab ingot edge crystal grain level index be G2.0(average-size be 180 μm), without burn-off phenomenon.This product
Without burn-off phenomenon, grain size is less, and quality is good.
Claims (6)
1., by a method for width adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, comprise the steps:
(1) dispensing: calculate remelting aluminium ingot according to subject alloy composition and return material and the consumption of each intermediate alloy, returning material
The mass percent accounting for total input amount is 0-80%, weighs raw material；
(2) melting: raw material puts into smelting furnace, smelting temperature is 680-760 DEG C, stirring, obtains aluminium alloy melt after melting, will
Aluminium alloy melt tuberculosis is to holding furnace；
(3) insulation, refine, standing: the aluminium alloy melt in holding furnace is passed through Ar-Cl2Mixed gas carries out refine, argon with
It is 4-60:1 that chlorine is passed through the volume ratio of flow, and refining time is 10-50 minute, to carrying out aluminium alloy in holding furnace after refine
Melt stands 10-60 minute；
(4) online refine: the aluminium alloy melt after using online refinery by de-gassing device to stand step (3) insulation carries out refine,
Being passed through chlorine and argon, it is 7-80:1 that argon and chlorine are passed through the volume ratio of flow, and the rotor speed controlling gas flowmeter is
100-650Rpm, refining temperature is 700-735 DEG C, obtains the aluminium alloy melt after refine, in the aluminium alloy melt after refine
Hydrogen concentration≤0.12mg/100g；
(5) crystal grain refinement: add Al-Ti-B silk in the aluminium alloy melt after step (4) refine continuously and carry out at crystal grain refinement
Reason, adding speed is 80-150 cm/min, obtains the aluminium alloy melt after crystal grain refinement；
(6) on-line filtration: the aluminium alloy melt obtaining step (5) carries out filter cleaner；
(7) casting: after filtering in step (6), the aluminium alloy melt wide cut range of accommodation of gained is 2270-2570 mm, wide
Thickness rate scope is the chamfer crystallizer casting of 4.13-4.67, and controlling cast temperature is 680～720 DEG C, and discharge is 10-90
m2/ h, hydraulic pressure is 2.0-7.0 bar, and casting speed is 20-55 mm/min, obtains aluminium alloy flat bloom semi-finished product；
(8) soaking: the aluminium alloy flat bloom semi-finished product after casting are carried out equal heat treatment, obtains aluminium alloy flat bloom.
The method of width the most according to claim 1 is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, institute
State step (2) and also include the process of aluminium alloy melt composition adjustment: furnace rear thrown by all raw materials, when smelting temperature arrive 710-～
Melting 5-20 minute again after 740 DEG C, takes aluminium alloy melt and detects, be adjusted alloys components according to testing result,
Supplementing raw material to smelting furnace and continue fusing, when reaching subject alloy composition, the aluminium alloy melt obtained after fusing being completed turns
Note is to holding furnace.
The method of width the most according to claim 1 is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, institute
State in step (2), during stirring, use magnetic stirrer to be stirred.
The method of width the most according to claim 1 is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, institute
Stating in step (6), filter type uses 20-50ppi foamed ceramic filter plate to filter.
The method of width the most according to claim 1 is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, institute
Stating in step (8), equal hot mode is single-stage soaking or twin-stage soaking.
The method of width the most according to claim 1 is adjustable chamfer crystallizer casting big flakiness ratio aluminium alloy flat bloom, institute
Stating aluminium alloy flat bloom flakiness ratio is 4.13-4.67, and width dimensions is 2270-2570mm.
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Cited By (7)
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| CN106521264A (en) * | 2016-11-10 | 2017-03-22 | 广西大学 | Fusion casting technology for aluminum alloy flat ingot for packaging tin |
| CN107354350A (en) * | 2017-06-26 | 2017-11-17 | 中山市富智铝业有限公司 | A kind of aluminum alloy materials and its processing method |
| CN108220637A (en) * | 2017-12-29 | 2018-06-29 | 河南明泰科技发展有限公司 | 5A03 aluminium alloy cast ingots production method and 5A03 aluminium alloy cast ingots and application |
| CN108300879A (en) * | 2018-01-30 | 2018-07-20 | 广西南南铝加工有限公司 | Electric vehicle bus-bars conductor Al-Mg-Si alloy thin plate preparation process |
| CN108546850A (en) * | 2018-05-03 | 2018-09-18 | 广西南南铝加工有限公司 | A kind of production method of 6101 aluminum alloy plate materials of high conductivity |
| CN108559877A (en) * | 2018-01-30 | 2018-09-21 | 广西南南铝加工有限公司 | The processing technology of 6 line aluminium alloy cut deals of charging pile conductive pieces |
| CN109865805A (en) * | 2019-03-22 | 2019-06-11 | 广西南南铝加工有限公司 | A method of with adjustable cryslallizer cast duralumin alloy flat bloom |
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