CN104028961A - Intermediate-strength aluminum alloy wire and process for manufacturing same - Google Patents

Intermediate-strength aluminum alloy wire and process for manufacturing same Download PDF

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Publication number
CN104028961A
CN104028961A CN201410259612.2A CN201410259612A CN104028961A CN 104028961 A CN104028961 A CN 104028961A CN 201410259612 A CN201410259612 A CN 201410259612A CN 104028961 A CN104028961 A CN 104028961A
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line
strength
aluminium alloy
aluminum alloy
wire
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CN201410259612.2A
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CN104028961B (en
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汪传斌
徐静
夏霏霏
孙湛
田崇军
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远东电缆有限公司
新远东电缆有限公司
远东复合技术有限公司
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Abstract

The invention belongs to the field of overhead power transmission technologies, and discloses an intermediate-strength aluminum alloy wire and a process for manufacturing the same. The intermediate-strength aluminum alloy wire is used for an overhead conducting wire. The process includes adjusting components of alloy to a certain extent, and controlling an online deaeration purification system, rolling and an online solid-solution quenching system; performing wire drawing and ageing processing to ultimately obtain the single intermediate-strength aluminum alloy wire. The tensile strength of the single intermediate-strength aluminum alloy wire ranges from 260MPa to 300MPa, the elongation of the single intermediate-strength aluminum alloy wire is higher than or equal to 3.5%, and the single-wire conductivity of the single intermediate-strength aluminum alloy wire is higher than or equal to 57.5% IACS. The intermediate-strength aluminum alloy wire and the process have the advantages that the intermediate-strength aluminum alloy wire manufactured by the aid of the process is high in strength and elongation and good in conductivity, and an intermediate-strength aluminum alloy stranded wire which is formed after a plurality of intermediate-strength aluminum alloy wires are stranded with one another can be used for an overhead power transmission line and is high in tensile weight ratio, so that the running safety of the line can be improved; magnetic hysteresis loss and eddy current loss due to conventional steel-cored aluminum stranded wires can be prevented by the stranded wire which is completely formed after the intermediate-strength aluminum alloy wires are stranded with one another, and electric energy loss of the line can be greatly reduced.

Description

A kind of middle strength aluminium alloy line and production technology thereof

Technical field

The invention belongs to overhead transmission line aerial condutor technical field, relate to strength aluminium alloy line and production technology thereof in a kind of aerial condutor use.

Background technology

China's overhead transmission line generally be take steel-cored aluminium strand as main.As everyone knows, in steel-cored aluminium strand, steel core has not only increased the weight of wire, and has magnetic hystersis loss and eddy-current loss in current delivery process, causes the increase of line construction investment and operating cost.In recent years, national grid is advocated Resources for construction economizing type, environmentally friendly overhead transmission line energetically.The drawback occurring at overhead transmission line in order to reduce steel-cored aluminium strand, State Grid Corporation of China advocates overhead transmission line wire alloying, has occurred middle intensity, high strength, the alloy series product such as heat-resisting for this reason.Wherein for middle strength aluminium alloy, pertinent literature has report, as Chinese patent literature CN102041418A, CN102162050A and CN103451498A, wherein CN102041418A is by adopting alloy composition proportioning, by continuous casting and rolling mode, produce aluminium alloy rod, then aluminium alloy rod is carried out to artificial aging, carry out again wire drawing, after wire drawing, carry out again the middle strength aluminum alloy line that artificially aged process obtains, its tensile strength 245~290MPa, percentage elongation is 1.8~3.0%, and single line conductance is not less than 57.0%IACS; Same CN102162050A is by alloy composition proportioning, adopted continuous casting and rolling mode to produce aluminium alloy rod, then aluminium alloy rod is carried out to artificial aging, carry out again wire drawing, after wire drawing, carry out again the middle strength aluminum alloy line that artificially aged process obtains, its tensile strength is 230~250MPa, percentage elongation >=2.0%, and single line conductance is not less than 57.0%IACS; In these two kinds, to close wire elongation rate less for intensity aluminium, make stranded wire anti-overload ability and fatigue performance poor, cause security poor, these two patents need to be carried out artificial aging twice to the aluminium alloy wire of aluminium alloy rod and drawing in addition, not only increased operation, reduced efficiency, ag(e)ing process energy consumption is large simultaneously, has increased manufacturing cost; CN103451498A is by alloy composition proportioning, adopted continuous casting and rolling mode to produce aluminium alloy rod, then aluminium alloy rod is carried out to wire drawing, the middle strength aluminum alloy line that the laggard row artificially aged of wire drawing process obtains, strong its tensile strength >=245MPa in this, percentage elongation >=3.5%, single line conductance is not less than 58.5%IACS; In this, the electric conductivity of strength aluminium alloy line all improves, but its mechanical performance is lower, for overhead transmission line, its security is very important, when some big-length, large span, high height above sea level conveying circuit need to highlyer draw the product of anharmonic ratio, meets the requirement of transmission line of electricity security.

Summary of the invention

First object of the present invention is the not enough shortcoming that overcomes above-mentioned technology, the production technology of the middle strength aluminium alloy line that a kind of aerial condutor uses is provided, improve the anharmonic ratio of drawing of wire, improve the percentage elongation of single line, meet ultra-high-tension power transmission line big-length, large span, high height above sea level conveying circuit needs.

Realize the production technology of a kind of middle strength aluminium alloy line of first order of the present invention, comprise following processes step:

Step 1: strength aluminum alloy bar in preparing by continuous casting and rolling; (1) select aluminium ingot melting, form aluminium liquid, flow into holding furnace; (2) configuration of alloying component, stir: add intermediate alloy ingot, form aluminium alloy mixing material, and by the post analysis that stirs; (3) refining degasification, skim, standing: refining agent is blown in the aluminium liquid in holding furnace with nitrogen, and refining time is not less than 15 minutes, then surperficial slag liquid is taken off totally, then is carried out standing; (4) degasification outside line oven, online crystal grain thinning, filtration, direct casting, form aluminium alloy cast ingot; (5) by eddy-current heating, rolling, solution hardening, process, strength aluminium alloy bar in formation, enters take-up reel and carries out take-up; The aluminium ingot composition of selecting should meet Al>=99.70wt%, in aluminium ingot and aluminium intermediate alloy ingot (alloy pig is except body alloying element), impurity should meet Si≤0.07wt%, (Cr+V+Mn+Ti)≤0.015wt%, Fe≤0.20wt%, Cu≤0.01wt%; It is as follows that melting and alloy configuration should meet interior each element mass percent of stove: the content of Si is 0.45~0.65wt%, the content of Mg is 0.50~0.70wt%, (Cr+V+Mn+Ti) content≤0.015wt%, the content of B is 0.01~0.1wt%, the content of Fe is 0.18~0.25wt%, the content of Cu is 0.015~0.035wt%, and content of rare earth is 0.10~0.15wt%; Other various impurity contents are all not more than 0.03wt%; In stove, adopt electromagnetic agitation or manually stir, guaranteeing uniform ingredients, time of repose is not less than 40 minutes; Degasification comprises furnace refining degasification and the outer online degasification of stove; After secondary degasification, detect H in aluminum alloy melt 2content≤0.015mol/L; Crystal grain thinning is for adding online aluminium titanium boron (Al-5Ti-B) B alloy wire, and addition adjusts according to crystalline phase tissue, filters and adopts ceramic filter plate to filter; Each Buwen's degree is controlled: in holding furnace, temperature of aluminum liquid is 720~750 ℃, and the outer degasification temperature of aluminum liquid of stove is 710~730 ℃; Cast temperature is 695~705 ℃; 520~540 ℃ of induction heating temperatures, enter to roll 510~530 ℃ of temperature, and quench water temperature control is at 20~30 ℃, and the temperature of finished product aluminium alloy rod is controlled at 40~55 ℃; The diameter of the middle strength aluminium alloy bar that this step obtains is 9.5mm; Rolling comprises roughing and finish rolling, and roughing is 4 groups of rolls, and 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 multiple tracks mould to be drawn into the middle strength aluminium alloy single line of required diameter, each road lengthening coefficient is controlled between 1.20~1.30, and the speed of wire drawing is controlled at 8~13m/s; The middle strength aluminum alloy line that this step obtains can be the diameter round line that is 1.50mm~5.0mm, also can be that equivalent diameter is all kinds of molded line of 2.0mm~5.0mm, the cross sectional shape of molded line be circular or " recessed " shape or " protruding " shape or " Z " shape or serpentine or trapezoidal or watt shape;

Step 3: the middle strength aluminium alloy line drawing is put into aging furnace, by high-temperature aging, make the middle strength aluminium alloy line of conductance >=57.5%IACS, middle strength aluminium alloy line tensile strength 260~300MPa, percentage elongation >=3.5%, single line conductance >=57.5%IACS.Timeliness can adopt continous way aging furnace also can adopt fixed aging furnace, and aging temp is controlled at 160~190 ℃, and aging time is controlled at 6~10h, temperature control deviation ± 2 ℃ in stove; Tensile strength >=the 260MPa of the middle strength aluminium alloy line that this step obtains, percentage elongation >=3.5%, single line conductance >=57.5%IACS.

It is high that second object of the present invention is to provide a kind of intensity, conduct electricity very well, and the middle strength aluminium alloy line that the rate of stretching is large.

The technical scheme that realizes second object of the present invention is: by aforementioned production technology, prepared and obtained, the tensile strength >=260MPa of middle strength aluminium alloy line, percentage elongation >=3.5%, single line conductance >=57.5%IACS.

Adopted after technique scheme, the present invention has following beneficial effect: the mode that in (1) process using stove of the present invention, the outer degasification of degasification and stove combines, purify the gaseous impurity in aluminium liquid, and improve electric conductivity; In the operation of rolling, milling train changes traditional thick, three-roller Y shaped 14 frames of finish rolling, adopts 4 dual roll type pony roughing mills and 10 three-roller Y shaped finishing stands to form, and the independent transmission of the large rolling rate of roughing mill, is conducive to grain refinement, improves the quality of products; Adopt online eddy-current heating to guarantee forming Mg into rolling temperature 2in the required temperature range of Si hardening constituent, by press quenching system, to aluminium bar cooling quenching fast, form Mg 2si hardening constituent, thus aluminium bar intensity improved, and the aluminium bar of this technique rolling does not need separately to carry out artificial aging, more traditional technique is compared, and saves timeliness operation one, saves artificial and energy consumption, and the aluminium bar that this technique makes is compared with the stable performance of artificially aged aluminium bar, and aluminium bar strength fluctuation is within 5MPa.

(2) according to the aluminium alloy wire of invention system of the present invention, there is intensity high, conduct electricity very well, stretch the features such as rate is large, the middle strength aluminium alloy twisted wire of its many stranded rear formation is used for to overhead transmission line, there is the larger anharmonic ratio of drawing, improve the security of circuit operation, adopt the full twisted wire that strength aluminium alloy line is twisted in this simultaneously, magnetic hystersis loss and the eddy-current loss of having avoided conventional steel-cored aluminium strand to occur, greatly reduce the energy loss of circuit.Middle strength aluminium alloy line of the present invention can be applicable to conventional overhead transmission line, also can be for large span, large drop high altitude localities, the security that can greatly improve conveying circuit.

The specific embodiment

Processing step is:

1, select aluminium ingot melting.The aluminium ingot composition Al:99.79wt% selecting, in aluminium ingot, impurity should meet Si:0.06wt%, (Cr+V+Mn+Ti)≤0.013wt%, Fe:0.13wt%, Cu:0.002wt%, all kinds of impurity summation 0.21wt%;

2, alloy configuration, stirring.Add respectively aluminium-silicon ingots (AlSi12), alfer ingot (AlFe20), aluminum-boron alloy ingot (AlB3), rare earth aluminium alloy ingot (AlRe10), magnesium ingot, adopt electromagnetic agitation and the artificial mode that combines that stirs, stir, sampling spectral analysis, in stove, each element mass percent is as follows: Si:0.56wt%, the content of Mg is 0.63wt%, (Cr+V+Mn+Ti): 0.011wt%, the content of B is 0.021wt%, the content of Fe is 0.22wt%, the content of Cu is 0.02wt%, and content of rare earth is 0.11wt%;

3, furnace refining degasification, skim, standing.Refining agent is blown in aluminium liquid by high pure nitrogen (99.9999%), and aluminium liquid all will blow to up and down, guarantees that refining is even, refining 20 minutes, then skims, and the slag on aluminium liquid surface is taken off totally, time of repose is 50 minutes again, and in stove, temperature is controlled 735 ℃;

4, online degasification, online crystal grain thinning, filtration, direct casting, form aluminium alloy cast ingot.Open holding furnace flow pass, kettle furnace is slowly risen, aluminium alloy solution flows into the outer depassing unit of stove and carries out degasification again, detects H in chute aluminum alloy melt after secondary degasification 2content is 0.013mol/L, adds online aluminium titanium boron (Al-5Ti-B) B alloy wire in chute, and speed is 30cm/ minute, then by ceramic filter plate, filter, flow into casting ladle, employing level casting mode enters H shape crystallizing wheel, 701 ℃ of cast temperatures, go out 496 ℃ of ingot temperature;

5, eddy-current heating, rolling, solution hardening processing, take-up.By aluminium alloy ingot blank by access bridge, wash one's face, coalignment enters induction and adds device, 535 ℃ of eddy-current heating design temperatures, from induction heater 520 ℃ of ingot blank temperature out, by aluminum alloy rolled machine (roughing+finish rolling), be rolled into the middle strength aluminium alloy bar that diameter is 9.5mm, and middle strength aluminum alloy bar is entered to press quenching system, 29 ℃ of quenching water temperatures, the gross pressure 0.28MPa of water during quenching, in after quenching, the upper dish temperature of strength aluminum alloy bar is 51 ℃, finally by automatic wire-collecting machine, receives aluminium alloy rod;

6, bracing wire.The middle strength aluminum alloy bar of 9.5mm is passed through to 7 die wire drawings by High-speed Aluminium alloy wire drawing machine, be drawn into the aluminium alloy single line of 4.00mm, the speed 10m/s of wire drawing;

7, Ageing Treatment.The aluminium alloy wire of drawing is carried out to Ageing Treatment by continous way aging furnace, and aging temp is controlled at 180 ℃ ± 2 ℃, aging time 6.5h, and the performance that makes middle strength aluminium alloy line is as following table:

The performance of strength aluminum alloy line in table 1

Above-described specific embodiment; the object of patent of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention representative; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (9)

1. strength aluminium alloy line and a production technology thereof in, is characterized in that comprising the following steps:
Step 1: strength aluminum alloy bar in preparing by continuous casting and rolling; (1) select aluminium ingot melting, form aluminium liquid, flow into holding furnace; (2) configuration of alloying component, stir: add intermediate alloy ingot, form aluminium alloy mixing material, and by the post analysis that stirs; (3) refining degasification, skim, standing: refining agent is blown in the aluminium liquid in holding furnace with nitrogen, and refining time is not less than 15 minutes, then surperficial slag liquid is taken off totally, then is carried out standing; (4) degasification outside line oven, online crystal grain thinning, filtration, direct casting, form aluminium alloy cast ingot; (5) by eddy-current heating, rolling, solution hardening, process, strength aluminium alloy bar in formation, enters take-up reel and carries out take-up;
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 drawing is put into aging furnace, make the middle strength aluminium alloy line of conductance >=57.5%IACS by high-temperature aging.
2. a kind of middle strength aluminium alloy line according to claim 1 and production technology thereof, it is characterized in that: the aluminium ingot composition of selecting in described step 1 should meet Al >=99.70wt%, in aluminium ingot and aluminium intermediate alloy ingot, impurity should meet Si≤0.07wt%, (Cr+V+Mn+Ti)≤0.015wt%, Fe≤0.20wt%, Cu≤0.01wt%.
3. the production technology of a kind of middle strength aluminium alloy line according to claim 2, it is characterized in that: it is as follows that in described step 1, the alloying component of (2) should meet interior each element mass percent of stove: the content of Si is 0.45~0.65wt%, the content of Mg is 0.50~0.70wt%, (Cr+V+Mn+Ti) content≤0.015wt%, the content of B is 0.01~0.1wt%, the content of Fe is 0.18~0.25wt%, the content of Cu is 0.015~0.035wt%, and content of rare earth is 0.10~0.15wt%; Other various impurity contents are all not more than 0.03wt%; In stove, adopt electromagnetic agitation or manually stir, guaranteeing uniform ingredients, time of repose is not less than 40 minutes.
4. the production technology of a kind of middle strength aluminium alloy line according to claim 3, is characterized in that: in described step 1, degasification comprises the furnace refining degasification of (3) step and the degasification outside line oven of (4) step; After secondary degasification, detect H in aluminum alloy melt 2content≤0.015mol/L.
5. the production technology of a kind of middle strength aluminium alloy line according to claim 4, it is characterized in that: in step 1, crystal grain thinning is for adding online aluminium titanium boron Al-5Ti-B B alloy wire, addition adjusts according to crystalline phase tissue, filters and adopts ceramic filter plate to filter; Rolling in step 1 comprises roughing and finish rolling, and roughing is 4 groups of rolls, and finish rolling is 10 groups of rolls.
6. the production technology of a kind of middle strength aluminium alloy line according to claim 5, is characterized in that: in step 1, controlling temperature of aluminum liquid in holding furnace is 720~750 ℃; The outer online degasification temperature of aluminum liquid of stove is 710~730 ℃; Direct casting temperature is 695~705 ℃; Induction heating temperature is 520~540 ℃; The temperature that enters to roll of rolling is 510~530 ℃; Solution hardening water temperature is controlled at 20~30 ℃; The temperature of finished product aluminium alloy rod is controlled at 40~55 ℃.
7. the production technology of a kind of middle strength aluminium alloy line according to claim 6, it is characterized in that: in step 2, by High-speed Aluminium alloy wire drawing machine, adopt multiple tracks mould to be drawn into the middle strength aluminium alloy single line of required diameter on middle strength aluminum alloy bar, each road lengthening coefficient is controlled between 1.20~1.30, and the speed of wire drawing is controlled at 8~13m/s.
8. the production technology of a kind of middle strength aluminium alloy line according to claim 7, it is characterized in that: in step 3, the middle strength aluminum alloy single line drawing is carried out to artificial aging processing, aging furnace is continous way aging furnace or fixed aging furnace, aging temp is controlled at 160~190 ℃, aging time is controlled at 6~10h, temperature control deviation ± 2 ℃ in stove; In producing in step 1, the diameter of strength aluminium alloy bar is 9.5mm; In in step 2, strength aluminum alloy line is that diameter is that round line or the equivalent diameter of 1.50mm~5.0mm is 2.0mm~5.0mm molded line, and the cross sectional shape of molded line is circle or " recessed " shape or " protruding " shape or " Z " shape or serpentine or trapezoidal or watt shape; Tensile strength >=the 260MPa of the middle strength aluminium alloy line making, percentage elongation >=3.5%, single line conductance >=57.5%IACS.
9. a strength aluminium alloy line in, is characterized in that: by production technology claimed in claim 9, prepared and obtained, the tensile strength >=260MPa of middle strength aluminium alloy line, percentage elongation >=3.5%, single line conductance >=57.5%IACS.
CN201410259612.2A 2014-06-11 2014-06-11 A kind of middle strength aluminium alloy line and its production technology CN104028961B (en)

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CN104357717A (en) * 2014-10-24 2015-02-18 无锡乐华自动化科技有限公司 Aluminum alloy material and quenching treatment process thereof
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