CN101956103B - High strength alloy round aluminium rod and production method thereof - Google Patents
High strength alloy round aluminium rod and production method thereof Download PDFInfo
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Abstract
The invention provides a high strength alloy round aluminium rod and a production method thereof. Liquid aluminium with the content of more than 99.5% is added into a smelting furnace, the temperature is controlled to be 760-800 DEG C; silicon and magnesium and iron chelating agent are added, wherein the content of Si is controlled to be less than or equal to 0.6%, the content of Mg is controlled to be 0.3-0.9%, and the content of Fe is controlled to be less than or equal to 0.3%; aluminium melt is prepared, nitrogen is utilized to blow powder refining agent into the solution for refining, the usage amount of refining agent is 1.2kg/ton, and the pressure of nitrogen which is led in is 0.05-0.4Mpa, thus obtaining aluminium melt with higher purity; and continuous casting and tandem rolling are carried out on aluminium melt subject to standing, before casting, Al-Ti-B rod is added in a chute at the speed of 150mm/min, so as to carry out online grain refinement treatment on the aluminium melt; and the rolled wire is subject to solid solution strengthening by virtue of an atomization quenching channel. Compared with common pure aluminium electrician round aluminium rod, the Al-Si-Mg alloy round aluminium rod of the invention has the advantages that: tensile strength is improved by 56.5%, the maximum can reach 64.6%; corresponding elongation is increased by 200%, the maximum can reach 228%; and resistivity is increased by only 28%.
Description
Technical field
The present invention relates to the aluminum alloy materials technical field, specifically a kind of high-strength alloy circle aluminium bar and working method thereof.
Background technology
China makes electric wire at present and mainly adopts the fine aluminium round aluminum rod to process; Because fine aluminium round aluminum rod intensity is low; Tensile strength≤140MPa will add steel core usually and form the guiding principle core aluminum stranded wire when making electric wire, this will make the electric wire deadweight increase, resistance increases, erosion resistance reduces; Cause electric pole heavy burden increase, line losses increasing, the lost of life, be unfavorable for realizing the high voltage power transmission of big span, high carrying capacity.The high-strength alloy aluminium conductor has good heat resistance, characteristics that current capacity is big; High pressure, ultra-high voltage and and the bus of following voltage level on use can reduce materials consumption; Reduce investment outlay, simplify bus structure simultaneously, subtract the metal joint on the bus; Improve reliability of operation, therefore wide use prospect is arranged in generating and power transmission and transformation field.Particularly after the southern freezing disaster in 2008; National Development and Reform Committee has proposed the paces to the electrical network upgrading; High-strength alloy circle aluminium bar can use on high voltage transmission line, also has good advantage for the transformation of urban network increase-volume and the circuit of heavy icing area and the circuit in the narrow hallways of outskirts of a town.So high-strength alloy circle aluminium bar product more and more receives the attention of power system, electrical network rack construction now all trends towards adopting the aldural lead gradually at big overhead crossing engineering, heavy icing area and high current-carrying capacity circuit.
The main performance index of high-strength alloy circle aluminium bar is: resistivity≤35n Ω m, tensile strength>=150MPa, unit elongation>=10%.But domestic mature technology and industrialization are produced the producer of high-strength alloy circle aluminium bar and are not still existed; Even the highest round aluminium bar production line of present domestic equipment is exactly a packet header Chinalco 2005 introduce from Italian Continuus company with two continuous casting and rolling production lines introducing from magnesium state Southwire Co. (Southwire) in 2002 of aluminium Guizhou branch office; Owing to do not purchase the alloy formula technology when equipment is introduced; Later stage is not carried out deep research and development to high-strength alloy circle aluminium lever production technology yet; The former capital can't produce high-strength alloy circle aluminium bar, and fine aluminium round aluminum rod product can only be provided on market.My company is decided by at the end of Year 2008 to introduce Properzi continuous casting and rolling unit from Italian Continuus company for this reason, is devoted to exploitation, the research of high-strength alloy circle aluminium bar.
Summary of the invention
The object of the invention provides a kind of high-strength alloy circle aluminium bar (being the Al-Si-Mg alloy round aluminum rod) and working method thereof, and this high-strength alloy circle aluminium bar tensile strength significantly improves, and elongation obviously increases, and its resistivity only slightly reduces.
Technical scheme of the present invention is: at first, change round aluminum rod production melting technology, when carrying out chemical Composition Control, aluminium liquid is carried out Alloying Treatment, add master alloys such as pure metal such as an amount of Pure Silicon Metal, MAGNESIUM METAL 99 and chalybeate, titanium agent, aluminium boron; Secondly, adjustment casting operation adopts online interpolation grain-refining agent (aluminium titanium boron wire) crystal grain thinning, changes the distribution mode and the casting rate of water coolant simultaneously, obtains the fine strand; Once more, the adjustment rolling technology, through strand temperature (going into to roll temperature) and the adjustment emulsion distribution mode that control gets into milling train, the energy requirement when satisfying the aldural recrystallize, thus produce the alloy as electric circle aluminium bar that meets demands of different.Through atomizing quenching technology, the alloy round aluminum rod is carried out solution strengthening handle, thereby obtain high-quality Al-Si-Mg alloy round aluminum rod at last.
The addition of described silicon, magnesium, iron pure metal is: Si≤0.6%, Mg:0.3-0.9%, Fe≤0.3%; Aluminium titanium boron wire adds with 150mm/ minute speed in the casting operation.
Operational path of the present invention is following:
Primary aluminum liquid (955%) → batching → melting, refining → leave standstill → online article grain refinement → online degasification and the filtration → limit → induction heating of casting → mill → rolling → atomizing quenching → Al-Si-Mg alloy round aluminum rod
Casting and rolling process condition such as following table that the present invention uses:
Al-Si-Mg alloy round aluminum rod chemical ingredients of the present invention such as following table:
Al-Si-Mg alloy round aluminum rod performance index of the present invention and fine aluminium pole pair ratio, see the following form:
| Sequence number | The contrast project | The fine aluminium round aluminum rod | The Al-Cu alloy round aluminum rod |
| 1 | Resistivity (n Ω m) | ≤28.01 | ≤36.0 |
| 2 | The maximum tensile strength (Mpa) | 130 | 214 |
| 3 | Corresponding elongation (%) | 7 | 16 |
The present invention and prior art are relatively hanged down and are had following characteristics:
(1) raw material is with high-quality aluminium liquid, and key is the control smelting temperature in the fusion process, reduces the loss of alloying element.
When (2) controlling elements such as adding silicon, magnesium, iron, take into full account its scaling loss amount, selected suitable target value.
(3) elements such as silicon, magnesium, iron add fashionablely, adopt to add silicon and iron earlier, after treating to dissolve fully, suitably reduce smelting temperature, add pure metal magnesium again, and elements such as silicon, magnesium, iron adopt magnetic stirrer to stir in dissolution process, have reduced the segregation of metal.
(4) carried out the refinement of online article grain, online degasification and cascade filtration slagging-off in the casting cycle, the distribution of control knot article device water coolant simultaneously, it is better to make it obtain the article granularity, the even strand that gas slag content is lower.
Al-Si-Mg alloy round aluminum rod of the present invention is compared with common fine aluminium round aluminum rod, and its tensile strength has improved 56.5%, and maximum can reach 64.6%; Corresponding elongation has increased by 200%, and maximum can reach 228%; And resistivity only raises 28%.
Embodiment
One, batching and aluminium solution purify and dispose
(1) in smelting furnace, adding content is the aluminium liquid more than 99.5%, and temperature is controlled between 760～800 ℃;
(2) through after accurately calculating; Add metal and chalybeates (or master alloys such as titanium agent, aluminium boron) such as silicon, magnesium; Content is controlled to be Si≤0.6%, Fe≤0.3%, (other elements in the chemical ingredients are as impurity for Mg:0.3-0.9%; Do not add, just when composition analysis, monitor, do not exceed upper control limit and get final product); Chemical ingredients will be asked for an interview to table 1 in the prescription:
Table 1 chemical ingredients requires table
(3) earlier silicon and ferrous metal are added into melting in the smelting furnace, maintenance is 30-40 minute under 760～800 ℃ temperature, and with induction stirring thoroughly, evenly stir half a hour; Then add pure metal magnesium; Restir through on-the-spot sample analysis, confirms that each constituent content meets the requirements in the chemical ingredients.
(4) the aluminium solution for preparing is blown into refining treatment in the melt with nitrogen with the powder refining agent, and the refining agent consumption is 1.2 kilograms/ton, and the feeding nitrogen pressure is 0.05-0.4Mpa, thereby obtains the higher aluminium solution of clarity.Wherein refining agent is the ground flux of being made up of KCl, NaCl, sodium aluminum fluoride, CaCl (currently available products); It has stronger separation property, wettability, in aluminium alloy melt, can interact through physics, chemistry or physical chemistry solid-state non-metallic inclusion and gas are removed.
(5) the aluminium solution that composition is qualified, temperature is qualified leaves standstill, and the time was controlled at 20-240 minute.
(6) through the molten aluminium that leaving standstill processing cast, rolling.
Two, continuous casting and rolling
(1) before casting, in chute, the aluminium solution is carried out grain refining, method is online grain refining, aluminium titanium boron wire adds with 150mm/ minute speed, and through online degasification and filter cleaner;
(2) pouring temperature is controlled at about 685 ± 5 ℃, gets into four roller straps through horizontal cast aluminum liquid and takes turns in the film chamber of forming, and feed water coolant at the interior outside, the upper and lower sides four direction of mold; The total pressure of water coolant is 250KPa; Total flux is 1000L/min, and temperature is smaller or equal to 35 ℃, and cooling intensity is higher; High-intensity cooling can obtain the tiny equiax crystal of crystal grain, helps producing the high-quality strand;
(3) strand mills the sull of upper surface through edge milling machines, gets into the line-frequency induction heat temperature raising, controls well into rolling temperature; Introduce 14 passage continuous rolling units through pinch roll again and be rolled processing, the tandem rolling unit adopts the built-up type multi-pass rolling, organically combines with characteristics such as three-roller Y shaped milling train machining deformation are even duo mill machining deformation amount is big; Guarantee that line bar performance is good; Dimensional precision is high, and through regulating rolling emulsion automatically, realizes the control to alloy round aluminum rod intensity and elongation.
(4) rolling good wire rod carries out solution strengthening through the atomizing quench channel and handles, and the performance of alloy is tended towards stability, and has shortened the aging time and the process of alloy as electric circle aluminium bar, and makes the bar surface temperature be reduced to 40 ℃ to help reeling machine.
(5) the continuous casting and rolling process for production parameter sees the following form 2
Table 2 Al-Si-Mg alloy as electric circle aluminium bar continuous casting and tandem rolling processing parameter sees the following form
Claims (4)
1. a high-strength alloy is justified the aluminium bar, it is characterized in that the alloy round aluminum rod chemical ingredients is following:
Si0.3-0.9%, Mg0.35-0.9%, Fe0.5%, Cu0.10%, Zn0.10%, Mn0.03%, Cr0.03%, Mn+Cr0.06%, other are single 0.03%, and other add up to impurity 0.10%, Al surplus.
2. the working method of the described high-strength alloy of claim 1 circle aluminium bar is characterized in that carrying out according to the following steps:
1) batching and aluminium solution purify and dispose:
(1) in smelting furnace, adding content is the aluminium liquid more than 99.5%, and temperature is controlled between 760～800 ℃;
(2) add silicon, magnesium metal and chalybeate, content is controlled to be Si≤0.6%, Mg:0.3-0.9%, Fe≤0.3%; Earlier silicon and ferrous metal are added into melting in the smelting furnace, maintenance is 30-40 minute under 760～800 ℃ temperature, and with induction stirring thoroughly, evenly stir half a hour; Then add pure metal magnesium; Restir through on-the-spot sample analysis, confirms that each constituent content meets the requirements in the chemical ingredients;
(3) the aluminium solution for preparing is blown into refining treatment in the melt with nitrogen with the powder refining agent, and the refining agent consumption is 1.2 kilograms/ton, and the feeding nitrogen pressure is 0.05-0.4Mpa, thereby obtains the higher aluminium solution of clarity; Refining agent is the ground flux of being made up of KCl, NaCl, sodium aluminum fluoride, CaCl;
(4) the aluminium solution that composition is qualified, temperature is qualified leaves standstill, and the time was controlled at 20～240 minutes;
2) carry out continuous casting and rolling through the molten aluminium that leaves standstill processing:
(1) before the casting, the speed adding aluminium titanium boron wire with 150mm/ minute in chute carries out online grain refining processing to the aluminium solution, after online degasification and filter cleaner make its composition more even;
(2) get into four roller straps through horizontal cast aluminum liquid and take turns in the film chamber of forming, and feed water coolant at the interior outside, the upper and lower sides four direction of mold, the total pressure of water coolant is 250KPa, and total flux is 1000L/min, and temperature is smaller or equal to 35 ℃;
(3) strand mills the sull of upper surface through edge milling machines, gets into the line-frequency induction heat temperature raising, and control goes into to roll temperature, and introduces 14 groups of machine frame rolling mill tandem rollings through pinch roll;
(4) rolling good wire rod carries out the solution strengthening processing through the atomizing quench channel, and the performance of alloy is tended towards stability;
The continuous casting and rolling process for production parameter is:
In-line treatment degasification speed 200rpm, in-line treatment nitrogen pressure 200Kpa, the in-line treatment grain-refining agent adds speed 150mm/min, 685 ± 5 ℃ of pouring temperatures; 5.4 tons/hour of casting rates, 35 ℃ of temperature of cooling water, cooling water pressure 250KPa, continuous rolling goes into to roll 535 ℃ of temperature; 42 ℃ of off-line temperature go out LV 15m/s, 60 ℃ of rolling emulsion temperature; Rolling emulsion pressure 200Kpa, atomizing quenching pressure 450Kpa, atomizing quenching flow 600l/min.
3. the working method of high-strength alloy circle aluminium bar according to claim 2,14 groups of machine frame rolling mills when it is characterized in that tandem rolling are by 2 groups of perpendicular rollers and two groups of blooming mills that horizontal roller is formed, and the finishing mill of being made up of 10 groups of Y forming rolls constitutes.
4. the working method of high-strength alloy circle aluminium bar according to claim 2; Regulate the flow distribution of emulsion in 14 groups of machine frame rolling mills when it is characterized in that tandem rolling, the distribution mode size of emulsion alternately distributes, and promptly odd number machine frame rolling mill emulsion flow is less; Even number machine frame rolling mill emulsion flow is bigger; And the flow of even number machine frame rolling mill is the twice of odd number machine frame rolling mill flow, and to the quenching thermal treatment that atomizes of online wire rod, realizes that solution strengthening makes the alloy wire stable performance.
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| CN1888107A (en) * | 2006-07-14 | 2007-01-03 | 中国铝业股份有限公司 | High strength aluminium alloy wire and rod and their prepn process |
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| CN1888107A (en) * | 2006-07-14 | 2007-01-03 | 中国铝业股份有限公司 | High strength aluminium alloy wire and rod and their prepn process |
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