CN104532074A - High-conductivity hard aluminum lead and manufacturing method thereof - Google Patents
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Abstract
The invention discloses a high-conductivity hard aluminum lead and a manufacturing method thereof. An aluminum alloy comprises the following chemical components in percentage by weight: 0.10-0.25% of Fe, 0.05-0.10% of Si, 0.01-0.08% of Ca, 0.03-0.08% of B, 0.08-0.15% of RE, less than 0.008% of the total content of Cr, V, Ti and Mn, and the balance of Al. The manufacturing method comprises the following steps: preparing the aluminum alloy into a wire rod with the diameter of D by adopting but not limiting to a horizontal continuous casting-continuous extrusion process, wherein the wire rod has obvious characteristics of restoration fiber textures; and then keeping the temperature at 280-340 DEG C for 12-24 hours, annealing, and drawing the wire rod into a wire product with the diameter of d, wherein D is more than or equal to 4.9d (mm). The lead product has the following performance index at that moment: the tensile strength is 165-185MPa, the extensibility is not less than 2.0%, and the conductivity is not less than 63.0% of IACS (International Annealed Copper Standard). The high-conductivity hard aluminum lead disclosed by the invention can be prepared by directly adopting general-level industrial aluminum ingots (99.7%) as a raw material, and has the characteristics of simple production process, low cost, high lead product strength and conductivity, and stable and uniform performance.
Description
Technical field
The present invention relates to technical field of aluminum alloy technology, more specifically relate to a kind of high-conductivity hard aluminum wire and manufacture method thereof.
Background technology
Along with China's transferring electricity from the west to the east and the quickening of power networking process, the Aluminium Cable Steel Reinforced consumption of remote EHV transmission increases, for aluminium conductor provides wide market.Domesticly about need 50 ~ 600,000 tons of electrician's fine aluminiums every year at present, and for current in transmitting line electrician in the highest flight less with the research of conduction fine aluminium conductivity, thus the resistivity of various countries' electrical network conduction fine aluminium used is substantially at 2.8264 × l0
-8in the international standard level of Ω m (being equivalent to specific conductivity 61%IACS).What in this series products, be in better level is 1350E and the l370E aluminium alloy of the U.S., its specific conductivity in resistivity at 2.79 ~ 2.86 × l0
-8the scope of Ω m (being equivalent to specific conductivity 61.8 ~ 60.2%IACS) is slightly lower than International Power committee standard.The conductivity fluctuation of China's aluminium conductor is comparatively large, and it is 2.90 × l0 that nineteen eighty-three conducted electricity the national standard of resistivity of fine aluminium in the past
-8Ω m (being equivalent to specific conductivity 59.5%IACS).Afterwards, conducting electricity the national standard of resistivity of fine aluminium and international standard integrates with and changes 2.8264 × l0 into
-8Ω m.Still have a considerable amount of manufacturer not reach this standard at present, the product of some producer does not even also reach former national standard.Due to poor product quality, the line losses of China's electrical network is very high.Before upgrading urban and rural power grids, according to the investigation of power department, national grid loss is more than 8.9% of electrical grid transmission electricity, and the poorest (local power network) can reach 20%.Therefore, by reducing the resistivity of electrician's fine aluminium, can corresponding minimizing energy consumption be 2% and 13%, the annual like this saving space having 400 ~ 2,600 hundred million degree of electricity.Huge energy waste makes China work about electric power person recognize the electroconductibility (reduction resistivity) improving aluminium with regaining consciousness already, improves importance and the urgency of the transport efficiency of electrical network.Therefore, in the eighties in 20th century, China had once carried out the research work of this respect, wherein obtained greater advance with the research utilizing rare earth to improve the electroconductibility of aluminium conductor.But because Rare-Earth Element Chemistry character is vivaciously very responsive to technological factor, China's aluminium and rare earth resources complicated component, make the electrical property of rare earth aluminium conductor unstable, make this research direction still disputable so far, some manufacturers stop producing and using because of the action effect instability of rare earth.
The continuous casting and tandem rolling production method of patent document CN 102744256 A high conductivity aluminium bar, mainly by cleaning molten and add aluminum-boron alloy, make aluminium liquid boracic quality 0.02% ~ 0.06%, and control casting and rolling process, the intensity of aluminium bar is made to reach 110MPa, electric conductivity is 63.6%IACS, but such aluminium bar can ensure to reach 165Mpa by intensity after making hard aluminum wire after stretching, but electric conductivity is difficult to reach 63%IACS.
Patent document CN 103093855 A high conductivity rare earth hard aluminum conductor, disclose a kind of high conductivity rare earth hard aluminum conductor, its component is by weight percentage: iron 0.0875% ~ 0.145%, iron silicon ratio example controls 1.7 ~ 2.5, boron 0.01 ~ 0.12%, gadolinium 0.01 ~ 0.15%, all the other are aluminium.The invention also discloses the preparation method of this high conductivity rare earth hard aluminum conductor, mainly match aluminium ingot, melting, then carry out the process such as boronation, refining, obtained wire intensity 160MPa, electric conductivity 63%IACS, tensile strength is up to the hard aluminum wire of 160MPa.
The complete processing of a patent document CN 103413631 A high-conductivity hard aluminum wire, disclose a kind of complete processing of high-conductivity hard aluminum wire, it is characterized in that, the diameter of described original aluminum bar should calculate according to final finished diameter of wire and obtain, calculation formula is: D0=D/1-λ, in formula, D0 is original aluminum shank diameter, unit: mm; D is final finished diameter of wire, unit: mm; λ is optimal coefficient, and λ gets 0.68-0.75 (being equivalent to D0=3.125 ~ 4D).Present invention process can ensure that hard aluminum wire electric conductivity is more than 62.0%.
The preparation technology of a patent document CN 103854807 A high-conductivity hard aluminum wire, open alloy ingredient Al>=99.80wt%, Si≤0.05wt%, (Cr+V+Mn+Ti)≤0.01wt%, the content of B is the content of 0.01 ~ 0.1wt%, Fe is 0.06 ~ 0.12wt%; The intensity control of the high connductivity aluminum steel be drawn into is at 160MPa ~ 180MPa, and resistivity controls at≤0.027500 Ω mm
2/ m (being equivalent to electric conductivity 62.7%IACS)
In addition, there are documents and materials to report high conductivity round aluminum rod containing rare earth, boron, add mixed rare earth (0.02% ~ 0.2%) and boron (0.01% ~ 0.045%), resistivity 2.73 ~ 2.76 × l0 of its aluminium bar simultaneously
-8Ω m (being equivalent to electric conductivity 63.1 ~ 62.5%IACS), the intensity of individual wires is l65 ~ l85MPa.But under normal circumstances, the resistivity of hard state aluminium conductor 0.2 × l0 higher than aluminium bar
-8Ω m, therefore, the specific conductivity of the hard wire that this aluminium bar is made usually can only reach 62.7%IACS.
Therefore, that develops a kind of stable processing technique prepares low-resistivity aluminum conductor, for country saves a large amount of electric energy, has urgent and necessity and fabulous market application foreground and economic and social profit.According to related data statistics, on the ultra-high-tension power transmission line of 100km, a 50kV, resistivity often reduces by 1%, can saves energy be 45.2 ten thousand kWh every year.Technical indicator of the present invention is compared with the round aluminium bar of existing national standards, and resistivity can reduce by 2.7% ~ 5%, is drawn into the wire under hard state, and when intensity ensures to reach existing hard aluminum wire l65 ~ l85MPa, its specific conductivity will more than 63.0%IACS.Like this, an only above-mentioned circuit, the electric energy can saved every year is 122 ~ 2,260,000 kWh.If the ultra-high-tension power transmission line in the whole nation all adopts the aluminium conductor that this round aluminium bar is made, the electric energy of enormous quantity will can be saved for country every year.63%IACS high conductivity remote ultra-high voltage aluminum wire is the best energy-saving product of current international and domestic aerial condutor field electric conductivity, and it can be applicable to high, medium and low pressure transmission line.And being obviously better than international like product due to its resistivity and these two the key technical indexes of intensity, other indexs are also all better than domestic standard.Accordingly, can estimate, high conductivity aluminium conductor not only has market widely at home, also has very strong competitive power in the international market.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is meeting hard aluminum wire intensity (l65 ~ l85MPa) and unit elongation (being not less than 2%) reaches demand while, its specific conductivity also will be not less than 63%IACS, thus provide one directly can adopt regular grade industry aluminium ingot raw material (99.7%) high-conductivity hard aluminum wire produced, guarantee that production cost is suitable with existing electrical aluminum rod.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of high-conductivity hard aluminum wire, the chemical composition of this aluminium conductor comprises by weight percentage: Fe 0.10-0.25%, Si0.05-0.10%, Ca 0.01-0.08%, B 0.03-0.08%, RE 0.08-0.15%, Cr+V+Ti+Mn total content is less than 0.008%, Al surplus.
Preferably, Fe content is 0.12-0.25%.
More preferably, Fe content is 0.15-0.20%.
Preferably, Si content is 0.06-0.08%.
Preferably, Ca content is 0.02-0.05%.
Preferably, B content is 0.04-0.06%.
Preferably, RE content is 0.10-0.12%.
Described hard aluminum wire performance: tensile strength 165-185MPa, unit elongation is not less than 2.0%, and electric conductivity is not less than 63.0%IACS.
Present invention also offers a kind of manufacture method of high-conductivity hard aluminum wire, this manufacture method comprises the steps:
The first step: horizontal casting-the continuously extruded or continuous casting and rolling of aluminium conductor bar base:
Bar base → water-cooled → rolling that the horizontal casting-continuous extruding technology flow process of aluminium conductor bar base is alloying ingredient → melting, the horizontal casting → continuously extruded diameter of refining → multiple crystallizer parallel connection is D;
The continuous casting and rolling technology process flow of aluminium conductor bar base is alloying ingredient → melting, refining → be continuously cast into blank → multi-pass hot continuous rolling that the length of side is 40 ~ 50mm diamond-shaped cross-section becomes diameter to be the bar base → rolling → air cooling of D;
Second step: the anneal of aluminium conductor bar base:
Be that the aluminium conductor bar base of D carries out 280-340 DEG C of insulation 12-24 hour anneal by diameter;
3rd step: the stretching of aluminium conductor:
According to different size diameter d wire product, determine that it should meet the quantitative deformation relationship of D >=4.9d mm.
Preferably, be that the aluminium conductor bar base of D carries out 300-320 DEG C of insulation annealing in 16-20 hour by diameter in the anneal of above-mentioned second step.
(3) beneficial effect
High-conductivity hard aluminum wire product performance index of the present invention reaches: tensile strength 165-185MPa, unit elongation is not less than 2%, electric conductivity is not less than 63%IACS, and adopt general industry level aluminium ingot (99.7%) to be raw material production, production cost is suitable with existing electrical aluminum rod.Therefore the present invention has that production cost is low, technique is simple, product mechanical property and conductivity is excellent, stable, effect uniformly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the graphic representation that alloying element content affects aluminium conductivity;
Fig. 2 is that alloy element Fe and silicone content are to the graphic representation of aluminium intensity effect.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
Research shows: electrician with in commercial-purity aluminium (99.7%A1), usually always contains the elements such as Cr, V, Ti, Mn of a small amount of Fe, Si and trace.Namely the electric conductivity that these elements (especially with the trace element that solid solution state exists) all can reduce aluminium increases its resistivity.Optimizing components object is to filter out from numerous elements to the useful element of electric conductivity as Addition ofelements, remove harmful element as much as possible or the harmful element of solid solution in aluminium is converted into precipitate and be present in grain boundaries, do not make again its electric conductivity reduce to reach raising intensity.
Figure 1 shows that the impact of alloying element on aluminium conductivity, can find: affect little as Fe and Si etc. on the specific conductivity of aluminium containing a small amount of impurity in the common aluminium ingot of technical grade (99.7%), the aluminium conductor that specific conductivity is not less than 63%IACS can be obtained; But the impurity trace elements such as Mn, Ti, Cr, V have obvious impact to the conductivity of aluminium.
Fe is impurity common in aluminium, and its solubleness in aluminium liquid is high, and therefore under all molten states, iron is soluble in aluminium.But iron is solubleness very low (maxima solubility is 0.052%) in the solid state, be present in the major part of the iron in aluminium more than 0.052% be metallic second phase and combine with aluminium and other element, because iron solubleness in aluminium is limited and be applied in aluminium electric conductor.Due to the existence of iron, the intensity of conductor increases (see Fig. 2), and again under medium high temperature, its creep property is also improved.With the increase of Fe addition in fine aluminium, intensity significantly improves, and conductivity variations is little.Therefore, in general industry level aluminium ingot, the mechanical property of aluminium conductor is usually ensured in the mode increasing Fe.
Si and iron are often present in aluminium simultaneously, and forming the intensity of compound to aluminium with iron has certain effect, but the relatively higher conductivity of impurity silicon to aluminium has detrimentally affect.
The solid solubility of Ca in aluminium is extremely low, with Al
4ca compound exists.Ca and Si forms CaSi
2, be insoluble to aluminium, thus reduce the solid solution capacity of Si, the electric conductivity of commercial-purity aluminium can be improved slightly.
The effect that B improves aluminium electroconductibility is that B can react with the detrimental impurity element ti in aluminium, V, Cr, Mn etc., generate boride or their complex compound, make them be changed into by solid solution state separate out state and be deposited on bottom melt, reduce the distortion of aluminium conductor internal crystal framework.In addition, add B and can also increase crystallization nuclei quantity in aluminium liquid, crystal grain thinning.Therefore, the intensity and electric conductivity that add justifying aluminium bar of B are all helpful.Boron is as the grain-refining agent of solidification, and addition is 0.005-0.1%.
The gases such as the hydrogen in mixed rare earth and aluminium liquid and some impurity elements have stronger avidity, can generate the compound that fusing point is high, therefore it have certain dehydrogenation, refining, purification and rotten effect.Adding a certain amount of RE makes it be combined with impurity such as being solid-solubilized in Fe, Si in aluminum substrate, generates stable intermetallic compound, reduces the solid solution capacity of impurity element in matrix, can effectively to suppress in commercial-purity aluminium Fe, Si element to the deleterious effect of electroconductibility.Simultaneously, rare earth element increases the constitutional supercooling in alloy crystallisation process and provides a large amount of heterogeneous forming core core, the growth of a large amount of new nucleus restriction column crystal, thus obtain flourishing equiax crystal, play the effect of grain refining, significantly improve the metallographic structure of aluminium alloy, reduce the formation of crack of aluminium alloy, and crack initiation position and expansion approach in alloy fracture process are changed, be conducive to the malleableize of alloy, round aluminum rod intensity and plasticity are all increased.
In addition, although by adding other alloying element of trace to increase substantially intensity of aluminum alloy in technical pure aluminium ingot (Al99.7%), the conductivity of aluminium can be had a strong impact on again but then.In order to solve this technical barrier, the present invention is while trace alloying element is added in optimization, make full use of annealing to the effect improving conductivity, and cold hardening and refined crystalline strengthening are to the effect of intensity, propose and control aluminium conductor bar base metallographic structure and carry out anneal, and guarantee that the total deformation amount of finish of drawing process reaches the specific production technique of certain severe.
The present invention designs by providing a kind of aluminum alloy chemical composition with satisfied raising aluminium conductor intensity, unit elongation and specific conductivity demand.Based on existing result of study, the chemical constitution (% by weight) of alloy of the present invention is as follows: Fe 0.10-0.25%, Si 0.05-0.10%, Ca 0.01-0.08%, B0.03-0.08%, RE 0.08-0.15% and Cr+V+Ti+Mn total content is less than 0.008%, Al surplus.
In embodiments of the invention, the Fe content in alloy of the present invention is preferably 0.12-0.25%, and is more preferably 0.15-0.20%.
In embodiments of the invention, the Si content in alloy of the present invention is preferably 0.06-0.10%, and is more preferably 0.06-0.08%.
In embodiments of the invention, the Ca content in alloy of the present invention is preferably 0.01-0.06%, and is more preferably 0.02-0.05%.
In embodiments of the invention, the B content in alloy of the present invention is preferably 0.04-0.08%, and is more preferably 0.04-0.06%.
In embodiments of the invention, the RE content in alloy of the present invention is preferably 0.08-0.14%%, and is more preferably 0.10-0.12%.
On the other hand, present invention also offers a kind of producing and manufacturing technique being applicable to this aluminium conductor, comprise the steps:
The first step: horizontal casting-the continuously extruded or continuous casting and rolling of aluminium conductor bar base.
Bar base → water-cooled → rolling that the horizontal casting-continuous extruding technology flow process of aluminium conductor bar base is alloying ingredient → melting, refining → horizontal casting (multiple crystallizer is in parallel) → continuously extruded diameter is D.
Bar base → rolling → air cooling that the continuous casting and rolling technology process flow of aluminium conductor bar base is alloying ingredient → melting, refining → continuous casting (length of side is the blank of 40 ~ 50mm diamond-shaped cross-section) → hot continuous rolling (multi-pass) diameter is D.
In the horizontal casting-continuously extruded or continuous casting and rolling process of the aluminium wire pole base of the above-mentioned the first step, its metallographic microstructure has significantly replys fibrous tissue feature.
Second step: the anneal of aluminium conductor bar base:
Be that the aluminium conductor bar base of D carries out 280-340 DEG C of insulation 12-24 hour anneal by diameter.And be more preferably carry out 300-320 DEG C insulation 16-20 hour anneal.
3rd step: the stretching of aluminium conductor:
According to different size diameter d wire product, determine that it should meet the quantitative deformation relationship of D >=4.9d (mm).
The present invention is further illustrated below by embodiment.
Embodiment 1:
Adopt 99.7% general industry level aluminium ingot and Al-Fe, Al-Ca, Al-B, Al-RE master alloy, calculate with the chemical composition ranges of high conductivity aluminium the part by weight that each alloy adds according to electrician, prepare burden in this ratio, in two 500Kg capacity combustion gas smelting furnace after fusing, refining, insulation and on-line filtration, adopt spectrum direct-read method to carry out chemical composition analysis to solution sampling, actual measurement composition is in table 1.Adopt the horizontal caster of band 10 crystallizers to be cast as the round bar base that diameter is Ф 12mm, it is 670 ~ 690 DEG C that casting temp controls, and horizontal casting pulling speed 1100mm/min, is often coiled heavily about 100Kg horizontal casting shallow bid round bar base.By this bar base after cleaning, rinsing, drying, LJ300 aluminium continuous extruder is squeezed into the round bar product that diameter is Ф 15mm, it is 320 DEG C that continuously extruded temperature controls, and extrusion wheel velocity is 22rpm; This being gone out after die orifice product is cooled to the temperature of 40 ~ 60 DEG C utilizes identical tension receipts winding apparatus to carry out rolling to it.320 DEG C/16 hours anneal post-tensionings are carried out to extrusion stem and is stretched into Ф 3.05mm wire rod, product mechanical property and electrical property are tested, in table 2.
Table 1 embodiment 1 high-conductivity aluminum alloy actual measurement chemical composition wt% (Al surplus)
| Element | Si | Fe | Ca | B | RE | Cr+V+Ti+Mn |
| Content | 0.051 | 0.161 | 0.023 | 0.041 | 0.116 | 0.0058 |
Table 2 embodiment 1 high-conductivity hard aluminum wire (Ф 3.05mm) mechanical property and electrical property
Embodiment 2-4
Compared with embodiment 1, distinctive points is only the proportioning adjusting raw material, is prepared as follows high-conductivity hard aluminum wire (see table 3 and table 4) by identical method.
Table 3 embodiment 2-4 high-conductivity aluminum alloy actual measurement chemical composition wt% (Al surplus)
| Element | Si | Fe | Ca | B | RE | Cr+V+Ti+Mn |
| Embodiment 2 | 0.055 | 0.166 | 0.024 | 0.043 | 0.118 | 0.0056 |
| Embodiment 3 | 0.054 | 0.163 | 0.021 | 0.046 | 0.115 | 0.0057 |
| Embodiment 4 | 0.050 | 0.169 | 0.019 | 0.042 | 0.119 | 0.0055 |
Table 4 embodiment 2-4 high-conductivity hard aluminum wire (Ф 3.05mm) mechanical property and electrical property
Embodiment 5-7
Compared with embodiment 1, distinctive points is only the proportioning adjusting raw material, is prepared as follows high-conductivity hard aluminum wire (see table 5 and table 6) by identical method.
Table 5 embodiment 5-7 high-conductivity aluminum alloy actual measurement chemical composition wt% (Al surplus)
| Element | Si | Fe | Ca | B | RE | Cr+V+Ti+Mn |
| Embodiment 5 | 0.060 | 0.110 | 0.012 | 0.033 | 0.088 | 0.0060 |
| Embodiment 6 | 0.068 | 0.184 | 0.038 | 0.050 | 0.120 | 0.0067 |
| Embodiment 7 | 0.078 | 0.220 | 0.042 | 0.059 | 0.145 | 0.0078 |
Table 6 embodiment 5-7 high-conductivity hard aluminum wire (Ф 3.05mm) mechanical property and electrical property
The present invention adopts and on the basis of technical pure aluminium ingot, adds trace alloying element, optimized alloy composition, develops a kind of high-conductivity aluminum alloy wire, simplifies aluminium conductor production process;
Utilize annealing to improving the effect of electric conductivity, and cold hardening and refined crystalline strengthening are to the effect of intensity, optimize the bar material annealing-coupling that stretches novel process.
Wire product integrated performance index is obviously better than domestic and international existing like product.
Above embodiment is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1. a high-conductivity hard aluminum wire, it is characterized in that, the chemical composition of described hard aluminum wire comprises by weight percentage: Fe 0.10-0.25%, Si 0.05-0.10%, Ca 0.01-0.08%, B 0.03-0.08%, RE 0.08-0.15%, Cr+V+Ti+Mn total content is less than 0.008%, Al surplus.
2. high-conductivity hard aluminum wire according to claim 1, is characterized in that, described Fe content is 0.12-0.25%.
3. high-conductivity hard aluminum wire according to claim 2, is characterized in that, described Fe content is 0.15-0.20%.
4. high-conductivity hard aluminum wire according to claim 1, is characterized in that, described Si content is 0.06-0.08%.
5. high-conductivity hard aluminum wire according to claim 1, is characterized in that, described Ca content is 0.02-0.05%.
6. high-conductivity hard aluminum wire according to claim 1, is characterized in that, described B content is 0.04-0.06%.
7. high-conductivity hard aluminum wire according to claim 1, is characterized in that, described RE content is 0.10-0.12%.
8. the high-conductivity hard aluminum wire according to claim 1-7, is characterized in that, described hard aluminum wire performance is: tensile strength 165-185MPa, and unit elongation is not less than 2.0%, and electric conductivity is not less than 63.0%IACS.
9. the manufacture method of the high-conductivity hard aluminum wire described in any one of claim 1-8, is characterized in that, comprises the steps:
The first step: horizontal casting-the continuously extruded or continuous casting and rolling of aluminium conductor bar base:
Bar base → water-cooled → rolling that the horizontal casting-continuous extruding technology flow process of aluminium conductor bar base is alloying ingredient → melting, the horizontal casting → continuously extruded diameter of refining → multiple crystallizer parallel connection is D;
The continuous casting and rolling technology process flow of aluminium conductor bar base is alloying ingredient → melting, refining → be continuously cast into blank → multi-pass hot continuous rolling that the length of side is 40 ~ 50mm diamond-shaped cross-section becomes diameter to be the bar base → rolling → air cooling of D;
Second step: the anneal of aluminium conductor bar base:
Be that the aluminium conductor bar base of D carries out 280-340 DEG C of insulation 12-24 hour anneal by diameter;
3rd step: the stretching of aluminium conductor:
According to different size diameter d wire product, determine that it should meet the quantitative deformation relationship of D >=4.9d mm.
10. the manufacture method of high-conductivity hard aluminum wire according to claim 9, is characterized in that, is that the aluminium conductor bar base of D carries out 300-320 DEG C of insulation annealing in 16-20 hour in the anneal of above-mentioned second step by diameter.
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| CN105671372A (en) * | 2016-01-25 | 2016-06-15 | 华北电力大学 | Duralumin conductor material with 63% IACS and preparation method thereof |
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