CN104028961B - A kind of middle strength aluminium alloy line and its production technology - Google Patents
A kind of middle strength aluminium alloy line and its production technology Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- 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
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Abstract
The invention belongs to overhead power transmission technical field, disclose strength aluminium alloy line and its production technology during a kind of aerial condutor is used, the present invention quenches the control of system by the adjustment of certain alloy composition, online degassing and purifying system, rolling, on-line solution, then wire drawing, Ageing Treatment are passed through, finally give 260~300MPa of tensile strength, elongation >=3.5%, single line conductance >=57.5%IACS middle strength aluminium alloy single line.Middle strength aluminum alloy line produced by the invention has intensity height, conduct electricity very well, stretch the features such as rate is big, its the more middle strength aluminium alloy twisted wires formed after twisted are used in overhead transmission line, compare again with larger drawing, improve the security of circuit operation, while the twisted wire being twisted into using full strength aluminium alloy line in this, magnetic hystersis loss and the eddy-current loss that conventional steel core aluminum stranded conductor occurs are avoided, greatly reduces the energy loss of circuit.
Description
Technical field
The invention belongs to overhead transmission line aerial condutor technical field, is related to strength aluminium alloy during a kind of aerial condutor is used
Line and its production technology.
Background technology
China's overhead transmission line is typically based on steel-cored aluminium strand.It is well known that steel core not only increases in steel-cored aluminium strand
Added the weight of wire, and magnetic hystersis loss and eddy-current loss be present in electric current transmitting procedure, cause line construction investment and
The increase of operating cost.In recent years, national grid advocates Resources for construction economizing type, environmentally friendly overhead transmission line energetically.
In order to reduce steel-cored aluminium strand overhead transmission line occurs the drawbacks of, State Grid Corporation of China advocates overhead transmission line wire
Alloying, occurs the alloy series product such as middle intensity, high intensity, heat-resisting for this.Wherein for middle strength aluminium alloy, related text
Offer and have been reported that, such as Chinese patent literature CN102041418A, CN102162050A and CN103451498A, wherein
CN102041418A matches by using alloy composition, aluminium alloy rod is produced by continuous casting and rolling mode, then to aluminium alloy rod
Artificial aging is carried out, then carries out wire drawing, carries out the middle strength aluminium alloy line that the process of artificial aging obtains after wire drawing again, its
245~290MPa of tensile strength, elongation are 1.8~3.0%, and single line conductance is not less than 57.0%IACS；Equally
CN102162050A is matched by alloy composition, is employed continuous casting and rolling mode and is produced aluminium alloy rod, then aluminium alloy rod is entered
Row artificial aging, then wire drawing is carried out, the middle strength aluminium alloy line that the process of artificial aging obtains is carried out after wire drawing again, it is anti-
Zhang Qiangdu is 230~250MPa, elongation >=2.0%, and single line conductance is not less than 57.0%IACS；Intensity aluminium closes in this two kinds
Wire elongation rate is smaller so that twisted wire anti-overload ability and fatigue performance are poor, cause security poor, in addition this
Two patents need to carry out artificial aging twice to aluminium alloy rod and the aluminium alloy wire drawn, not only increase process, reduce
Efficiency, while ag(e)ing process energy consumption is big, adds manufacturing cost；CN103451498A is matched by alloy composition, the company of employing
Casting tandem rolling mode produces aluminium alloy rod, then carries out wire drawing to aluminium alloy rod, and the process that artificial aging is carried out after wire drawing obtains
To middle strength aluminium alloy line, its strong tensile strength >=245MPa, elongation >=3.5%, single line conductance are not less than in this
58.5%IACS；Electric conductivity of strength aluminium alloy line all improves in this, but its mechanical performance is relatively low, for frame
Empty transmission line of electricity, its security is particularly significant, when again some long lengths, big span, High aititude conveying circuit need higher drawing to compare
Product meet the requirement of transmission line safety.
The content of the invention
First purpose of the present invention is to overcome the shortcomings of above-mentioned technology shortcoming, there is provided a kind of middle intensity of aerial condutor
The production technology of aluminium alloy wire, the drawing for improving wire are compared again, improve the elongation of single line, to meet that ultra-high-tension power transmission line greatly enhances
Degree, big span, High aititude conveying circuit need.
Realize a kind of production technology of middle strength aluminium alloy line of first mesh of the invention, including following technique procedure of processing：
Step 1：Strength aluminium alloy bar in being prepared by continuous casting and rolling；(1) aluminium ingot and melting are selected, forms aluminium liquid, is flowed into
Holding furnace；(2) configuration of alloying component, stirring：Intermediate alloy ingot is added, forms aluminium alloy mixing liquid, and it is equal by stirring
Even post analysis；(3) furnace refining degasification, skim, stand：Refining agent is blown into the aluminium liquid in holding furnace with nitrogen, during refining
Between be not less than 15 minutes, then the slag liquid on surface is taken off totally, then is stood；(4) online degasification, online refinement are brilliant outside stove
Grain, filtering, direct casting, form aluminium alloy cast ingot；(5) handled by sensing heating, rolling, solution hardening, intensity in formation
Aluminium alloy rod, take-up is carried out into take-up reel；The aluminium ingot composition of selection should meet Al >=99.70wt%, be closed among aluminium ingot and aluminium
Impurity should meet Si≤0.07wt% in ingot (alloy pig is in addition to body alloying element), (Cr+V+Mn+Ti)≤0.015wt%,
Fe≤0.20wt%, Cu≤0.01wt%；Melting and alloy configuration should meet that each element mass percent is as follows in stove：Si's contains
Measure as 0.45~0.65wt%, Mg content is 0.50~0.70wt%, the content≤0.015wt% of (Cr+V+Mn+Ti), B's
Content is 0.01~0.1wt%, and Fe content is 0.18~0.25wt%, and Cu content is 0.015~0.035wt%, rare earth
Content is 0.10~0.15wt%；Other various impurity contents are no more than 0.03wt%；In stove using electromagnetic agitation or
Artificial stirring, it is ensured that uniform ingredients, time of repose are not less than 40 minutes；Degasification is including online outside furnace refining degasification in stove and stove
Degasification；H in aluminum alloy melt is detected after secondary degasification2Content≤0.015mol/L；Crystal grain thinning adds aluminium titanium boron (Al- to be online
5Ti-B) B alloy wire, addition are adjusted according to crystalline phase tissue, and filtering is filtered using ceramic filter plate；Each step temperature control
For：Temperature of aluminum liquid is 720~750 DEG C in holding furnace, and the outer degasification temperature of aluminum liquid of stove is 710~730 DEG C；Cast temperature be 695~
705℃；520~540 DEG C of induction heating temperature, enters to roll 510~530 DEG C of temperature, and the control of quenching water temperature is at 20~30 DEG C, finished product aluminium
The temperature control of rod of metal alloy is at 40~55 DEG C；The a diameter of 9.5mm for the middle strength aluminium alloy bar that this step obtains；Rolling includes roughing
And finish rolling, roughing are 4 groups of rolls, finish rolling is 10 groups of rolls；
Step 2：Middle strength aluminium alloy bar is drawn into middle strength aluminium alloy line by aluminum alloy wire-drawing machine multi-pass；Adopt
The middle strength aluminium alloy line of diameter needed for multiple tracks mould is drawn into, each road lengthening coefficient control are drawn between 1.20~1.30
The speed control of silk is in 8~13m/s；The middle strength aluminium alloy line that this step obtains can be a diameter of 1.50mm~5.0mm circle
Line or equivalent diameter are all kinds of molded line of 2.0mm~5.0mm, and the cross sectional shape of molded line is circular or " recessed " shape or " convex "
Shape or Z-shaped or serpentine or trapezoidal or shoe；
Step 3：The middle strength aluminium alloy line of drawing is put into aging furnace, by high-temperature aging be made conductance >=
57.5%IACS middle strength aluminium alloy line, middle strength aluminium alloy line 260~300MPa of tensile strength, elongation >=3.5% are single
Line conductance >=57.5%IACS.Timeliness can use continous way aging furnace to use fixed aging furnace, aging temp control
At 160~190 DEG C, aging time controls in 6~10h, in-furnace temperature control deviation ± 2 DEG C system；The middle intensity aluminium that this step obtains closes
Tensile strength >=260MPa of gold thread, elongation >=3.5%, single line conductance >=57.5%IACS.
Second object of the present invention is to provide a kind of intensity height, conducts electricity very well, and stretches the big middle strength aluminium alloy line of rate.
Realizing the technical scheme of second object of the present invention is：It is prepared by foregoing production technology, middle intensity aluminium closes
Tensile strength >=260MPa of gold thread, elongation >=3.5%, single line conductance >=57.5%IACS.
After employing above-mentioned technical proposal, the present invention has following beneficial effect：(1) technique of the invention is using in stove
The mode that degasification and the outer degasification of stove are combined, purifies the gaseous impurity in aluminium liquid, improves electric conductivity；Milling train changes in the operation of rolling
Become traditional thick, three-roller Y shaped 14 frames of finish rolling, using 4 dual roll type pony roughing mills and 10 three-roller Y shaped finishing stand groups
Into, the big rolling rate driven separately of roughing mill, be advantageous to crystal grain refinement, improve product quality；Using online sensing heating ensure into
Roll temperature and form Mg2In temperature range needed for Si hardening constituents, by press quenching system, the quick cooling of aluminium bar is quenched
Fire, form Mg2Si hardening constituents, so as to improve aluminium bar intensity, the aluminium bar of technique rolling is not required to separately carry out artificial aging, more traditional
Technique compare, save one of aging sequence, save artificial and energy consumption, and aluminium bar of the aluminium bar compared with artificial aging made from the technique
Stable performance, aluminium bar strength fluctuation is within 5MPa.
(2) aluminium alloy wire made according to the invention of the present invention has intensity high, conducts electricity very well, stretches the features such as rate is big, will
Its more middle strength aluminium alloy twisted wires formed after being twisted are used in overhead transmission line, and there is larger drawing to compare again, improve line
The security of road operation, while the twisted wire being twisted into using full strength aluminium alloy line in this, are avoided conventional steel core aluminum stranded conductor and are gone out
Existing magnetic hystersis loss and eddy-current loss, greatly reduce the energy loss of circuit.The middle strength aluminium alloy line of the present invention can be applied
In conventional aerial transmission line of electricity, big span, big drop high altitude localities are can be used for, the peace of conveying circuit can be greatly improved
Quan Xing.
Embodiment
Processing step is：
1st, aluminium ingot and melting are selected.The aluminium ingot composition Al of selection：99.79wt%, impurity should meet Si in aluminium ingot：
0.06wt%, (Cr+V+Mn+Ti)≤0.013wt%, Fe：0.13wt%, Cu：0.002wt%, all kinds of impurity summations
0.21wt%；
2nd, alloy configuration, stirring.Aluminium-silicon ingots (AlSi12), alfer ingot (AlFe20), aluminium boron is separately added into close
Ingot (AlB3), rare earth aluminium alloy ingot (AlRe10), magnesium ingot, mode is combined using electromagnetic agitation and artificial stirring, stirring is equal
Even, sampling spectral analysis, each element mass percent is as follows in stove：Si：0.56wt%, Mg content are 0.63wt%, (Cr+V
+Mn+Ti)：0.011wt%, B content are 0.021wt%, and Fe content is 0.22wt%, and Cu content is 0.02wt%, dilute
Native content is 0.11wt%；
3rd, furnace refining degasification in stove, skim, stand.Refining agent is blown into aluminium liquid by high pure nitrogen (99.9999%)
In, aluminium liquid will be blown to up and down, ensured that refining is uniform, refined 20 minutes, then skimmed, the slag on aluminium liquid surface is taken off
Totally, then time of repose 50 minutes, in-furnace temperature control 735 DEG C；
4th, online degasification, online refinement crystal grain, filtering, direct casting, aluminium alloy cast ingot is formed.It is logical to open holding furnace outflow
Road, kettle furnace is slowly risen, aluminium alloy solution flows into the outer depassing unit of stove and carries out degasification again, is examined after secondary degasification
H in flow-measuring flume aluminum alloy melt2Content is 0.013mol/L, adds aluminium titanium boron (Al-5Ti-B) B alloy wire, speed online in chute
Spend for 30cm/ minutes, then filtered by ceramic filter plate, flow into casting ladle, H-shaped crystallization is entered using horizontal casting mode
Wheel, 701 DEG C of cast temperature, goes out 496 DEG C of ingot temperature；
5th, sensing heating, rolling, solution hardening processing, take-up.By aluminum alloy holding poles by access bridge, wash one's face, coalignment
Device is added into sensing, 535 DEG C of sensing heating design temperature, 520 DEG C of ingot blank temperature is come out from sensing heater, passes through aluminium alloy
Roll mill (roughing+finish rolling) is rolled into a diameter of 9.5mm middle strength aluminium alloy bar, and middle strength aluminium alloy bar is entered online
Quenching system, 29 DEG C of water temperature is quenched, the gross pressure 0.28MPa of water, the upper disk temperature of middle strength aluminium alloy bar after quenching during quenching
For 51 DEG C, aluminium alloy rod is received finally by automatic wire-collecting machine；
6th, bracing wire.9.5mm middle strength aluminium alloy bar is drawn into by high speed aluminium alloy wire drawing machine by 7 die wire drawings
4.00mm aluminium alloy single line, the speed 10m/s of wire drawing；
7th, Ageing Treatment.The aluminium alloy wire of drawing is subjected to Ageing Treatment, aging temp control by continous way aging furnace
At 180 DEG C ± 2 DEG C, aging time 6.5h, the performance such as following table of strength aluminium alloy line in being made：
The performance of strength aluminium alloy line in table 1
Particular embodiments described above, the purpose, technical scheme and beneficial effect of patent of the present invention are carried out entering one
Step describes in detail, should be understood that the specific embodiment that the foregoing is only the present invention represents, is not limited to this
Invention, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., should be included in this hair
Within bright protection domain.
Claims (8)
1. a kind of production technology of middle strength aluminium alloy line, it is characterised in that comprise the following steps：
Step 1：Strength aluminium alloy bar in being prepared by continuous casting and rolling；(1) aluminium ingot and melting are selected, forms aluminium liquid, flows into insulation
Stove；(2) configuration of alloying component, stirring：Add intermediate alloy ingot, formed aluminium alloy mixing liquid, and by stirring after
Analysis；(3) furnace refining degasification, skim, stand：Refining agent is blown into the aluminium liquid in holding furnace with nitrogen, refining time is not
Less than 15 minutes, then the slag liquid on surface is taken off totally, then is stood；(4) online degasification, online refinement crystal grain, mistake outside stove
Filter, direct casting, form aluminium alloy cast ingot；(5) handled by sensing heating, rolling, solution hardening, strength aluminium alloy in formation
Bar, take-up is carried out into take-up reel；
The alloying component of (2) should meet that each element mass percent is as follows in stove in the step 1：Si content be 0.45~
0.65wt%, Mg content are 0.50~0.70wt%, and the content≤0.015wt% of (Cr+V+Mn+Ti), B content are 0.01
~0.1wt%, Fe content are 0.18~0.25wt%, and Cu content is 0.015~0.035wt%, content of rare earth 0.10
~0.15wt%；Other various impurity contents are no more than 0.03wt%；
Degasification includes online degasification outside the stove of furnace refining degasification and (4) step in the stove of (3) step in step 1；By secondary degasification
H in aluminum alloy melt is detected afterwards2Content≤0.015mol/L；Online degasification temperature of aluminum liquid is 710~730 DEG C outside stove；(5)
Step, induction heating temperature are 520~540 DEG C；Rolling enters to roll temperature for 510~530 DEG C；The control of solution hardening water temperature 20~
30℃；The temperature control of finished product aluminium alloy rod is at 40~55 DEG C；Rolling in step 1 includes roughing and finish rolling, and roughing is 4 groups
Roll, finish rolling are 10 groups of rolls；
Step 2：Middle strength aluminium alloy bar is drawn into middle strength aluminium alloy line by high speed aluminum alloy wire-drawing machine multi-pass；
Step 3：The middle strength aluminium alloy line of drawing is put into aging furnace, conductance >=57.5% is made by high-temperature aging
IACS middle strength aluminium alloy line.
A kind of 2. production technology of middle strength aluminium alloy line according to claim 1, it is characterised in that：In the step 1
The aluminium ingot composition of selection should meet Al >=99.70wt%, and impurity should meet Si≤0.07wt% in aluminium ingot and aluminium intermediate alloy ingot,
(Cr+V+Mn+Ti)≤0.015wt%, Fe≤0.20wt%, Cu≤0.01wt%.
A kind of 3. production technology of middle strength aluminium alloy line according to claim 2, it is characterised in that：In the step 1
(2) using electromagnetic agitation or artificial stirring in stove, it is ensured that uniform ingredients, time of repose are not less than 40 minutes.
A kind of 4. production technology of middle strength aluminium alloy line according to claim 3, it is characterised in that：Refined in step 1
Crystal grain adds aluminium titanium boron Al-5Ti-B B alloy wires to be online, and addition adjusts according to crystalline phase tissue, and filtering uses ceramic filter
Plate is filtered.
A kind of 5. production technology of middle strength aluminium alloy line according to claim 4, it is characterised in that：Controlled in step 1
Temperature of aluminum liquid is 720~750 DEG C in holding furnace；Direct casting temperature is 695~705 DEG C.
A kind of 6. production technology of middle strength aluminium alloy line according to claim 5, it is characterised in that：In step 2 by
Strength aluminium alloy bar is drawn into the middle strength aluminium alloy line of required diameter by high speed aluminium alloy wire drawing machine using multiple tracks mould, respectively
Road lengthening coefficient control is between 1.20~1.30, and the speed control of wire drawing is in 8~13m/s.
A kind of 7. production technology of middle strength aluminium alloy line according to claim 6, it is characterised in that：It will be drawn in step 3
The middle strength aluminium alloy line of system carries out artificial aging processing, and aging furnace is continous way aging furnace or fixed aging furnace, timeliness temperature
At 160~190 DEG C, aging time is controlled in 6~10h, in-furnace temperature control deviation ± 2 DEG C for degree control；It is strong in being produced in step 1
Spend a diameter of 9.5mm of aluminium alloy rod；Middle strength aluminium alloy line is a diameter of 1.50mm~5.0mm round wires or waited in step 2
Imitate a diameter of 2.0mm~5.0mm molded line, the cross sectional shape of molded line for circular or " recessed " shape or " convex " shape or Z-shaped or serpentine or
Trapezoidal or shoe；Tensile strength >=260MPa of obtained middle strength aluminium alloy line, elongation >=3.5%, single line conductance >=
57.5%IACS.
A kind of 8. middle strength aluminium alloy line, it is characterised in that：It is prepared as the production technology described in claim 7, middle intensity
Tensile strength >=260MPa of aluminium alloy wire, elongation >=3.5%, single line conductance >=57.5%IACS.
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| CN102766788A (en) * | 2012-08-09 | 2012-11-07 | 上海电缆研究所 | Preparation method of moderate strength Al-Mg-Si alloy rods and alloy wires through natural ageing treatment |
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