CN100478476C - High strength aluminium alloy wire and rod and their prepn process - Google Patents
High strength aluminium alloy wire and rod and their prepn process Download PDFInfo
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- CN100478476C CN100478476C CNB2006100511479A CN200610051147A CN100478476C CN 100478476 C CN100478476 C CN 100478476C CN B2006100511479 A CNB2006100511479 A CN B2006100511479A CN 200610051147 A CN200610051147 A CN 200610051147A CN 100478476 C CN100478476 C CN 100478476C
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title description 10
- 230000008569 process Effects 0.000 title description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 35
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 229910052796 boron Inorganic materials 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 35
- 239000011777 magnesium Substances 0.000 claims description 34
- 239000004411 aluminium Substances 0.000 claims description 32
- 229910045601 alloy Inorganic materials 0.000 claims description 26
- 239000000956 alloy Substances 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 19
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000010936 titanium Substances 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 10
- 239000010703 silicon Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000011651 chromium Substances 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005728 strengthening Methods 0.000 description 6
- 238000006356 dehydrogenation reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008859 change Effects 0.000 description 4
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- 229910018464 Al—Mg—Si Inorganic materials 0.000 description 2
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- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- MKPXGEVFQSIKGE-UHFFFAOYSA-N [Mg].[Si] Chemical compound [Mg].[Si] MKPXGEVFQSIKGE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention discloses one kind of high strength aluminum alloy wire and rod and their preparation process. The high strength aluminum alloy contains Fe 0.15-0.25 wt%, Mg 0.65-0.75 wt%, Si 0.56-0.66 wt%, Cu not more than 0.10 wt%, Zn not more than 0.10 wt%, Mn not more than 0.03 wt%, Cr not more than 0.03 wt%, B not more than 0.06 wt%, Ti 0.006-0.009 wt%, impurity not more than 0.10 wt% and Al for the rest.
Description
Technical field:
The present invention relates to a kind of aluminum alloy line bar and preparation technology thereof, particularly a kind of 6201 aluminum alloy line bar and preparation technologies thereof.
Background technology:
6201 aluminum alloy line bars have high strength, high drawing quality, can directly make high-intensity electric wire or cable, be applied to the high-pressure delivery electrical network of large span, high carrying capacity, in addition, the alloy wire bar can be used for doing Optical Fiber Composite aerial condutor (OPGW), can also be used as the establishment line of CATV wide band access user cable.Because economic rapid growth, becoming increasingly conspicuous of the energy and demand contradictory, country will transform and dilatation wire-core transportion wire, cable that the high-pressure delivery electrical network uses, the high-intensity cable of high-performance, the wire products that need a large amount of aluminum alloy line bars to draw, but the line bar of domestic production at present mainly is the conventional aluminium bar, can not satisfy the needs of high-pressure delivery electrical network, and the production of 6201 alloy wire bars is in space state at home.
Summary of the invention:
The objective of the invention is to: provide a kind of 6201 aldural line bar and preparation technologies thereof, to satisfy the demand of market to 6201 aldural line bars.
The present invention is achieved in that a kind of aldural line bar, and it contains aluminium, iron, magnesium, silicon, copper, zinc, manganese, chromium, boron, titanium elements, and the mass percent of each element is: iron 0.15～0.25%, magnesium 0.65～0.75%, silicon 0.56～0.66%, copper≤0.10%, zinc≤0.10%, manganese≤0.03%, chromium≤0.03%, boron≤0.06%, titanium 0.006～0.009%, foreign matter content≤0.10%, all the other are aluminium.
The preparation technology of above-mentioned aldural line bar, this technology may further comprise the steps:
The melting of A, aluminium alloy: in keeping stove, add master alloy piece and metal magnesium ingot earlier, alloy block should meet the standard-required of GB/TB733-2000 " ZLD102 alloy pig ", the metal magnesium ingot should meet the GB/T3499-83 standard-required, and then by the aluminium mouth that advances that keeps stove to add temperature in keeping stove be 760～780 ℃ electrolytic aluminium liquid, obtain aluminium alloy melt after the fusing, W in the melt
Mg/ W
Si＜1.73;
The casting of B, aluminium alloy: adopt wire feeder in above-mentioned aluminium alloy melt, to feed the Al-5Ti-1B alloy wire, make the interior Ti content of melt between 0.006%～0.009%, it is 700～720 ℃ in teeming temperature then, pouring speed is to pour into a mould under the condition of 6～6.3t/h, obtains the aluminium alloy strand;
C, aluminum alloy line bar rolling: the aluminium alloy strand that step B is obtained is preheated to through electromagnetic induction heating furnace sends into the line bar that mill milling becomes alignment footpath after 487 ± 6 ℃, the volumetric concentration of roll emulsion is 8～10%, the temperature of roll emulsion is 54～66 ℃, go out the car temperature greater than 400 ℃, obtain the aluminum alloy line bar;
D, the aluminum alloy line bar that step C is obtained were placed 128 hours under natural aging, promptly got aldural line bar of the present invention.
In the preparation technology of above-mentioned aldural line bar, the aluminium alloy melt that steps A obtains adopted two rotors to remove steam stove earlier and carries out online degassing and purifying before the casting of carrying out step B, and removing gas medium is argon gas, and the gas flow of argon gas is 0.2～0.3m
3/ min, rotor speed is 200～300 rev/mins, to remove the hydrogen in the aluminium alloy melt.
Among the preparation technology of aforesaid aldural line bar, the ceramic filter plate of 14～15 purpose filtering nets or 30PPI can be set at the chute two ends at the whole story that two rotors removes steam stove, aluminium alloy melt be carried out double-stage filtering, to remove being mingled with in the aluminium alloy melt.
The present invention has filled up the production blank of domestic 6201 alloy wire bars, for playing unique, irreplaceable effect as the use of big leap lead in the high-pressure delivery electrical network of raw material with aldural line bar, to promoting the integral body progress of China's aluminium and aluminum alloy melt casting technology, shorten and the gap of international founding bleeding edge and the total quality that improves China's Industrial materials, the present situation that changes the long-term dependence on import of high performance material plays an important role.Simultaneously, the present invention adopts electrolytic aluminium liquid directly to be cast as the aluminium alloy ingot blank, reduced the resmelting ingot middle-chain of founding again, reduced the waste of the energy, the environmental pollution of having avoided the overlapping investment of aluminium processing enterprise and having brought because of remelting processing, 6201 alloy wire bars per ton can be created 1397.5 ten thousand yuan of economic benefits, and to produce 2000 tons per year, direct economic benefit can reach 279.5 ten thousand yuan.
Description of drawings:
Accompanying drawing 1 is the crystallisation process synoptic diagram of aldural line bar of the present invention.
Embodiment:
Embodiments of the invention: aldural line bar, it contains aluminium, iron, magnesium, silicon, copper, zinc, manganese, chromium, boron, titanium elements, and the mass percent of each element is: iron 0.20%, magnesium 0.65%, silicon 0.60%, copper≤0.10%, zinc≤0.10%, manganese≤0.03%, chromium≤0.03%, boron≤0.06%, titanium 0.006%, foreign matter content≤0.10%, all the other are aluminium.
When preparing above-mentioned aldural line bar, may further comprise the steps:
The melting of A, aluminium alloy: add 102 master alloy pieces and metal magnesium ingot in keeping stove earlier, 102 alloy mass should meet the standard-required of GB/TB733-2000 " ZLD102 alloy pig ", and Chemical Composition should meet following table and require:
Metal magnesium ingot quality should meet GB/T3499-83 standard secondary or the above requirement of secondary, and chemical ingredients should meet the regulation of following table.
And then by the aluminium mouth that advances that keeps stove to add temperature in keeping stove be 760～780 ℃ electrolytic aluminium liquid, obtain aluminium alloy melt after the fusing, and make W in the melt
Mg/ W
Si＜1.73; Wherein Si, Mg element is added on to produce within preceding 1 hour and carries out, this process control was finished at 10～15 minutes, the production that is added on of Fe element was just finished in preceding 2 hours, alloy melting Fe element carries out with the form of mother alloy briquetting, in advancing the aluminium process, jettisoninging is keeping stove to enter aluminium mouth bottom, adds by the fusing of constantly washing away of aluminium water;
The casting of B, aluminium alloy: adopt wire feeder in above-mentioned aluminium alloy melt, to feed the Al-5Ti-1B alloy wire, making the interior Ti content of melt is 0.006%, and feeding wire speed is 38mm/min, is 710 ℃ in teeming temperature then, pouring speed is to pour into a mould under the condition of 6.0t/h, obtains the aluminium alloy strand;
C, aluminum alloy line bar rolling: the aluminium alloy strand that step B is obtained is preheated to through electromagnetic induction heating furnace sends into the line bar that mill milling becomes alignment footpath after 487 ± 6 ℃, the volumetric concentration of roll emulsion is 8～10%, the temperature of roll emulsion is 54～66 ℃, go out the car temperature greater than 400 ℃, obtain the aluminum alloy line bar;
D, the aluminum alloy line bar that step C is obtained were placed 128 hours under natural aging, promptly got aldural line bar of the present invention.
Carrying out at the aluminium alloy melt that steps A is obtained before the casting of step B, adopting two rotors to remove steam stove earlier and carry out online degassing and purifying, removing gas medium is argon gas, and the gas flow of argon gas is 0.2～0.3m
3/ min, rotor speed is 250 rev/mins, removing the hydrogen in the aluminium alloy melt, and the ceramic filter plate of 14 purpose filtering nets or 30PPI is set at the chute two ends at the whole story that two rotors removes steam stove, aluminium alloy melt is carried out double-stage filtering, to remove being mingled with in the aluminium alloy melt.
Aluminium alloy is that Al-Mg-Si is an alloy, and its standard weave is Al-Mg
2Si has medium tenacity and outstanding welding and etch resistant properties.Mg
2Magnesium silicon ratio among the Si is 1.73: 1, so in the Al-Mg-Si line aluminium alloy, what have belongs to the silicon surplus, what have belongs to the magnesium surplus, and 6201 aluminium alloys belong to the superfluous alloy of Si, and as superfluous magnesium (Mg:Si＞1.73) is arranged in the alloy, magnesium can reduce Mg
2The solid solubility of Si in aluminium, thus Mg reduced
2The strengthening effect of Si in alloy, if excess silicon (Mg:Si＜1.73) is arranged in the alloy, it can refinement Mg
2The Si particle can also be separated out the excess silicon particle, and intensity is further improved.This superfluous Si exists can refinement Mg
2The Si particle can also be separated out superfluous Si particle intensity is further improved, and when Si content surplus 0.11% left and right sides, can reduce the metal deformation drag, helps boosting productivity.The adding of Mg, Si is in order to form Mg in melt
2The Si strengthening phase passes through Mg
2The precipitation-hardening of Si strengthening phase is used for realizing the high strength of line bar.At room temperature the MAGNESIUM METAL element is retained in the Solid solution and can reduces electric conductivity; Free in addition magnesium can reduce Mg
2The solubleness of Si reduces the heat treated effect of solution.So all magnesium elements all must combination without repetition.Just can make its combination without repetition by adding excessive silicon.And excessive silicon also can react with iron, generates alpha-aluminum-iron-silicon compound (Fe
3SiAl
12), this compounds can play the effect of secondary reinforcer.Can add copper and boron additive according to the needs of product performance.
Hydrogen is the main gaseous impurities in the 6201 aluminum alloy line bars, and excessive hydrogen content will badly influence the tensile property and the electric conductivity of line bar, and the present invention adopts online two rotors to carry out degasification except that steam stove, can effectively remove hydrogen.In order to confirm the degasification furnace parameters, carried out the degassing efficiency experiment, experimental data sees Table 1.
Table 1 degassing efficiency experimental data table
| Sequence number | Pouring speed t/h | Temperature of aluminum liquid | Remove the steam stove degassing efficiency | Keep the outlet of still ml./100g of place | The dehydrogenation outlet of still ml./100g of place | Ml./the 100g of casting ladle place | Rotor speed rev/min | |
| 1 | 6.0 | 752 | 0.20 | 0.473 | 0.378 | 0.380 | 0.1 | 100 |
| 2 | 6.2 | 748 | 0.21 | 0.461 | 0.364 | 0.371 | 0.1 | 200 |
| 3 | 6.2 | 740 | 0.28 | 0.482 | 0.347 | 0.352 | 0.1 | 300 |
| 4 | 6.0 | 750 | 0.32 | 0.501 | 0.341 | 0.344 | 0.1 | 400 |
| 5 | 6.2 | 746 | 0.29 | 0.493 | 0.35 | 0.380 | 0.2 | 100 |
| 6 | 5.8 | 742 | 0.61 | 0.522 | 0.202 | 0.212 | 0.2 | 200 |
| 7 | 6.0 | 740 | 0.64 | 0.534 | 0.191 | 0.213 | 0.2 | 300 |
| 8 | 5.8 | 748 | 0.64 | 0.486 | 0.175 | 0.184 | 0.2 | 400 |
| 9 | 6.2 | 738 | 0.59 | 0.496 | 0.201 | 0.221 | 0.3 | 100 |
| 10 | 6.2 | 742 | 0.62 | 0.506 | 0.195 | 0.212 | 0.3 | 200 |
| 11 | 5.8 | 748 | 0.65 | 0.517 | 0.183 | 0.198 | 0.3 | 300 |
| 12 | 6.0 | 750 | 0.64 | 0.52 | 0.187 | 0.199 | 0.3 | 400 |
| 13 | 6.2 | 748 | 0.6 | 0.499 | 0.201 | 0.217 | 0.4 | 100 |
| 14 | 6.2 | 742 | 0.59 | 0.465 | 0.191 | 0.210 | 0.4 | 200 |
| 15 | 5.8 | 740 | 0.6 | 0.512 | 0.205 | 0.215 | 0.4 | 300 |
| 16 | 6.0 | 746 | 0.59 | 0.487 | 0.199 | 0.210 | 0.4 | 400 |
According to test-results, online design degassing and purifying process system is as follows: gas flow: 0.2～0.3m
3/ min; Rotor speed is 200～300 rev/mins.
From last table casting ladle data, aluminium liquid obviously reduces through air content after removing steam stove, gos up to some extent again when still arriving the casting ladle place.Can know that the gas second adsorption has taken place aluminium liquid.In order to improve the effect of degasification, guarantee the purity of aluminium liquid.At chute two ends at the whole story double-stage filtering is set, uses the ceramic filter plate of 14～15 purpose filtering nets or 30PPI.Prove that by experiment aluminium liquid air content substantially no longer gos up, experimental result sees Table 2.
Hydrogen richness detection case behind the multistage slagging-off filtering technique of table 2 employing
| Sequence number | Keep the outlet of still ml./100g of place | The dehydrogenation outlet of still ml./100g of place | Ml./the 100g of casting ladle place |
| 1 | 0.473 | 0.286 | 0.161 |
| 2 | 0.461 | 0.284 | 0.159 |
| 3 | 0.522 | 0.312 | 0.162 |
| 4 | 0.534 | 0.315 | 0.165 |
The influence that hydrogen content in the aluminium liquid is mingled with is very big, and the gas in the aluminium liquid exists the interaction relationship that certain symbiosis is deposited mutually with being mingled with, and is mingled with manyly more, and hydrogen richness is high more.Therefore, the present invention is mingled with based on eliminating in the purification process design, is aided with dehydrogenation, and dehydrogenation must be got rid of and be mingled with, and it is the basic technology route of dehydrogenation that eliminating is mingled with.
The present invention adopts Al-5Ti-1B alloy wire pole pair aluminium alloy melt to carry out thinning processing to obtain equiaxed grain structure, its cardinal principle is that online interpolation Al--5Ti--1B forms nucleus in aluminum solutions, be distributed in the molten aluminium, these a large amount of lattice points make the solid aluminium nucleation in process of cooling, thereby obtain equiaxed grain structure.In order to make aluminium liquid obtain sufficient refinement and not make the Ti too high levels and influence electric conductivity.Ti content need be controlled between 0.006～0.009% in the melt.
The process of the casting of aluminum alloy line bar must realize that product appearance is superior in quality, the inverse segregation phenomenon, therefore should make the cooling water inflow minimum of casting initial point aborning, and later cooling water inflow progressively strengthens.Adopt this type of cooling not only can obtain advantages of good crystallization, line base that defective is little can also make aluminium liquid finish crystallization in the shortest time, makes Mg
2The Si strengthening phase more remains in the sosoloid, guarantees strengthening effect.The crystallisation process of the present invention's 6201 aluminum alloy line bars is seen Fig. 1, as can see from Figure 1, in the middle of the ingot casting a long and thin zone is arranged, and this zone is in the medullary ray of motion strand (rod).Along with the cooling of motion strand (rod), solidify gradually in this zone.Along with solidifying of aluminium liquid, it can produce contraction.In theory, this conical region is frozen into solid at the small cross-section end, and near the continuous filling aluminum water of the large section end of pour point, it is full that this zone is protected.In some cases, if new aluminium water is not filled in this zone, make the strand medullary ray produce hole owing to shrinking.This class hole will cause adverse influence to the quality of line bar.Table 3 is casting water formulation data tables of collecting in the experimental study process:
Table 3 casting water formulation data table
Sample number is that 1,2 strand big breach often occurs disconnected base takes place in process of production, and the strand of four samples in back number disconnected base phenomenon takes place significantly reduces.
According to commerical test research, determine that casting water prescription sees Table 4:
Table 4 casting water prescription
| Steel band 1 (L/S) | Steel band 2 (L/S) | Steel band 3 (L/S) | Steel band 4 (L/S) | Interior spray 1 (L/S) | Interior spray 2 (L/S) | Interior spray 3 (L/S) | Interior spray 4 (L/S) | Operator's side 1 # (L/S ) | Operator's side 2 # (L/S ) | Equipment side 1 # (L/S ) | Send out and be equipped with side 2 # (L/S ) |
| 17 | 35 | 447 | 424 | 19 | 40 | 425 | 276 | 55 | 118 | 55 | 119 |
6201 alloy wire bars belong to heat-treatable strengthened aluminum alloy, and solution strengthening is Mg mutually
2The Si phase utilizes natural aging precipitation-hardening principle to realize high physical strength, obtains electric conductivity preferably simultaneously.The applicant studies the natural aging rule research of 6201 alloy wire bars, and it the results are shown in Table 5, table 6, table 7, table 8, table 9 and table 10.
Table 5 6201 aluminium alloy tensile strength natural agings change cartogram
Table 6 6201 aluminium alloy tensile strength natural aging velocity of variation cartograms
Analyze: from above cartogram, tensile strength totally is the trend that fluctuation is risen.Within 16 hours, ascendant trend is the most obvious, and more unified.16～32 hours, majority was still rising, and generally speaking, tensile strength is in rising trend, can peak within 32 hours, tends towards stability then.Can know that by statistics the overall average ascending amount is 8.8%.
Table 7 6201 aluminum alloy line bar unit elongation change cartogram
Table 8 6201 aluminium alloy unit elongation velocity of variation cartograms
Analyze: from above table, the unit elongation of line bar totally is downward trend, and it is maximum to descend within 16 hours, is up to 19.05%.The positive number that occurs in the last table, this is because the poker of line bar is bad, the sample unit elongation is low for the first time causes.After 16 hours, the unit elongation of line bar totally is in stable fluctuation status.The total average rate of decrease of the first seven reel is 13.4% within 16 hours.
Table 9 6201 aluminum alloy line bar electric conductivitys change cartogram
Table 10 6201 aluminum alloy line bar electric conductivity velocity of variation cartograms
Analyze: from above table, line bar electric conductivity changes significantly ununified trend, but from the average rate of change, whole downward trend has appearred in the multi-conducting rate, the highest decline reaches 0.796%, and the highest rising reaches 0.708%, and overall average is changed to and descends 0.318%.
Claims (4)
1, a kind of aluminum alloy line bar, it contains aluminium, iron, magnesium, silicon, copper, zinc, manganese, chromium, boron, titanium elements, it is characterized in that: the mass percent of each element is: iron 0.15～0.25%, magnesium 0.65～0.75%, silicon 0.56～0.66%, 0＜copper≤0.10%, 0＜zinc≤0.10%, 0＜manganese≤0.03%, 0＜chromium≤0.03%, 0＜boron≤0.06%, titanium 0.006～0.009%, impurity≤0.10%, all the other are aluminium.
2, a kind of preparation technology of aluminum alloy line bar as claimed in claim 1 is characterized in that: this technology may further comprise the steps:
The melting of A, aluminium alloy: in keeping stove, add master alloy piece and metal magnesium ingot earlier, the master alloy piece should meet the standard-required of GB/TB733-2000 " ZLD102 alloy pig ", the metal magnesium ingot should meet the GB/T3499-83 standard-required, and then by the aluminium mouth that advances that keeps stove to add temperature in keeping stove be 760～780 ℃ electrolytic aluminium liquid, obtain aluminium alloy melt after the fusing, W in the melt
Mg/ W
Si＜1.73;
The casting of B, aluminium alloy: adopt wire feeder in above-mentioned aluminium alloy melt, to feed the Al-5Ti-1B alloy wire, the mass percentage content that makes Ti in the melt is between 0.006%～0.009%, it is 700～720 ℃ at pouring temperature then, casting rate is to cast under the condition of 6～6.3t/h, obtains the aluminium alloy strand;
C, aluminum alloy line bar rolling: the aluminium alloy strand that step B is obtained is preheated to through electromagnetic induction heating furnace sends into the line bar that mill milling becomes alignment footpath after 487 ± 6 ℃, the volumetric concentration of roll emulsion is 8～10%, the temperature of roll emulsion is 54～66 ℃, go out the car temperature greater than 400 ℃, obtain the aluminum alloy line bar;
D, the aluminum alloy line bar that step C is obtained were placed 128 hours under natural aging, promptly.
3, the preparation technology of aluminum alloy line bar according to claim 2, it is characterized in that: the aluminium alloy melt that steps A obtains is before the casting of carrying out step B, adopt two rotors to remove steam stove earlier and carry out online degassing and purifying, removing gas medium is argon gas, and the gas flow of argon gas is 0.2～0.3m
3/ min, rotor speed is 200～300 rev/mins, to remove the hydrogen in the aluminium alloy melt.
4, the preparation technology of aluminum alloy line bar according to claim 3, it is characterized in that: the ceramic filter plate that 14～15 purpose filtering nets or 30PPI are set except that the chute two ends at the whole story of steam stove at two rotors, aluminium alloy melt is carried out double-stage filtering, to remove being mingled with in the aluminium alloy melt.
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