CN109234584A - A kind of GIL shell moderate strength aluminium alloy strips and preparation method thereof - Google Patents
A kind of GIL shell moderate strength aluminium alloy strips and preparation method thereof Download PDFInfo
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- CN109234584A CN109234584A CN201811287896.0A CN201811287896A CN109234584A CN 109234584 A CN109234584 A CN 109234584A CN 201811287896 A CN201811287896 A CN 201811287896A CN 109234584 A CN109234584 A CN 109234584A
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- aluminium alloy
- alloy strips
- moderate strength
- preparation
- gil shell
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Abstract
The invention discloses a kind of GIL shell moderate strength aluminium alloy strips and preparation method thereof, the sum of weight percent is 100% meter, weight percent shared by contained each chemical component in the aluminium alloy strips are as follows: Si 0.90 ~ 1.10%, Fe 0.10 ~ 0.20%, Cu≤0.05%, Mg 0.60 ~ 0.90%, Ti≤0.01%, Cr≤0.03%, Mn≤0.03%, Zn≤0.03%, surplus Al.The present invention is based on Al-Si-Mg line aluminium alloy, by the innovation of optimizing components and preparation process, so that the alloy material defect is few, qualification rate is high, and its conductivity, up to 57%IACS or more, yield strength reaches 130MPa or more, with significant social and economic benefit, have a extensive future.
Description
Technical field
The invention belongs to aluminium alloy strips preparation fields, and in particular to a kind of GIL shell moderate strength aluminium alloy strips
And preparation method thereof.
Background technique
As the fast development and UHV transmission of domestic UHV transmission bring the environmental problem of electromagnetic radiation, GIL
(gas-insulated metal closed power transmission line) is as large capacity, loss is small, land occupation less, the few ideal super extra-high voltage of electromagnetic radiation
Transmission line of electricity, the market demand gradually rise.GIL shell generally uses welding fabrication after aluminium sheet band reel, the seal pipe after soldering
Road domestic demand is passed through SF6 or SF6-N2 gas as dielectric, therefore display pipe needs pressure-bearing, and this requires make the aluminium of pipeline
Alloy material has good intensity and weldability.In addition, can be induced in metal shell with value when GIL inner conductor conduction
Therefore reverse current to reduce GIL metal shell conductive exothermal, needs metal shell body to have high conductivity.
At present both at home and abroad generally using 5754-O state aluminum alloy plate materials as Large Diameter Pipeline, the GIL sheathing material of long length, but
The conductivity of 5754 aluminum alloy materials is only 37-39%IACS, yield strength 90-110MPa.It is therefore desirable to develop in one kind
Equal strength with high electrical conductivity can be used as GIL shell aluminium alloy strips again.The present invention is with Al-Si-Mg line aluminium alloy
Basis carries out the innovation of optimizing components and preparation process, produces conductivity and reach 57%IACS or more, yield strength reaches
130MPa or more can be applied to the aluminium alloy strips of GIL shell.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of GIL shell moderate strength aluminum alloy strip
Material and preparation method thereof.The conductivity of the aluminium alloy strips reaches 57%IACS or more, and yield strength is more than 130MPa, can be used as
GIL shell metal material.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of GIL shell moderate strength aluminium alloy strips, the sum of weight percent are 100% meter, contained each chemical component
Weight percent are as follows: Si 0.90 ~ 1.10%, Fe 0.10 ~ 0.20%, Cu≤0.05%, Mg 0.60 ~ 0.90%, Ti≤
0.01%, Cr≤0.03%, Mn≤0.03%, Zn≤0.03%, surplus Al.
Two main alloy elements of the Mg and Si as the material, in the alloy with Mg5Si6Based on precipitated phase, it can be improved
The electric conductivity and intensity of alloy, Mg5Si6Mg element and Si element mass ratio are about 0.81 in particle.Since Mg element is to alloy
The influence of conductivity is greater than Si element, and the presence of surplus Si can promote the precipitation of Mg element, therefore control Mg mass percent
Range is 0.60 ~ 0.90%, Si 0.90 ~ 1.10%.The intensity of alloy can be improved in Fe element, but excessive Fe element can reduce material
The moulding and conductivity of material, therefore the mass percent range of Fe is 0.10 ~ 0.20%.Other elements content mass percent list
Solely less than 0. 05%, will not have a negative impact to material property.
The GIL shell is comprised the steps of: with the preparation method of moderate strength aluminium alloy strips
(1) fine aluminium ingot, magnesium ingot, aluminium-silicon intermediate alloy and aluminium-iron intermediate alloy are added in smelting furnace, heating is fused into gold
After belonging to liquid, the gas-liquid mixture of argon gas and carbon tetrachloride is used in furnace, and (mass ratio of argon gas and carbon tetrachloride is logical for 8-9:1)
Furnace bottom molten aluminum purification system is crossed to aluminum anodizing 20-30 minutes, then stands 5-10 minutes；Later by the molten aluminum after standing by removing
The gas dissolved in device of air removal molten aluminum, then pass sequentially through deep-bed filter and tubular filter importing semi-continuous casting dress
It sets, is cast as rectangle ingot；
(2) gained rectangle ingot is put into behind sawing, milling face heating furnace, in 440-480 DEG C of heat treatment 2-10h, then come out of the stove
Hot rolling；
(3) aluminium after hot rolling is rolled into the intermediate base of 28-32mm thickness through reversible hot rough rolling mill, intermediate base temperature control exists
400-430 DEG C, then by finishing mill tandem rolling at the hot-rolled band of 4.0-10mm thickness, finishing mill finishing temperature control is in 260-290
DEG C, it is slowly cooled to room temperature in holding furnace after winding；
(4) slitting of coils of hot rolled longitudinal direction is batched to get GIL shell moderate strength aluminium alloy strips are arrived.
Further, when step (1) heating fusing, molten aluminum is sufficiently stirred using bottom type permanent magnetic stirrer；It crosses
H < 0.13m1/100gA1, slag inclusion content≤0.15mm in molten aluminum after filter2/1kg Al。
Further, the entrance roller-way upper and lower of hot rough rolling mill used has thermal isolating panel in step (3), to reduce
The heat loss of intermediate base.
Further, after step (3) winding, the speed being cooled to room temperature is no more than 15 DEG C/h.
The beneficial effects of the present invention are:
(1) present invention promotes Mg by the innovation to aluminum alloy chemical composition optimization and preparation process2Si phase, ferro-aluminum silication are closed
The element for being unfavorable for conduction is precipitated from solid solution in the formation of object, and then improves alloy conductive performance, realizes short route, height
Efficiency, the aluminium alloy strips conductivity produced reach 57%IACS or more, and yield strength is more than 130MPa, can be used as GIL shell
Use metal material.
(2) by reducing the Slag inclusion content in aluminum melt in the present invention, i.e., H < 0.15m1/ in aluminum melt after restriction filtering
100gA1, slag inclusion content≤0.15mm2Stomata in material, slag inclusion content can be greatly reduced, to improve material in/1kg Al
The intensity and conductivity of material.
(3) temperature in the present invention by the heating and temperature control of rectangle ingot in 440-480 DEG C, intermediate base is controlled in 400-
430 DEG C and hot rolled coil Slow cooling are for promoting Mg2The precipitation of Si phase promotes the precipitation of magnesium elements, improves alloy material
The conductivity of material.
Specific embodiment
In order to make content of the present invention easily facilitate understanding, With reference to embodiment to of the present invention
Technical solution is described further, but the present invention is not limited only to this.
Embodiment 1
A kind of GIL shell moderate strength aluminium alloy strips, the sum of weight percent are 100% meter, the weight of ingredient
Percentage are as follows: Si 1.03%, Fe 0.18%, Cu 0.02%, Mg 0.65%, Ti 0.01%, Cr 0.01%, Mn 0.01%, Zn
0.01%, surplus Al.
Preparation method comprises the steps of:
(1) intermediate alloys such as fine aluminium ingot, magnesium ingot, aluminium-silicon, aluminium-iron are added in smelting furnace, heating is fused into metal liquid
Afterwards, molten aluminum is sufficiently stirred using bottom type permanent magnetic stirrer, while uses the mixing of argon gas and carbon tetrachloride in furnace
Gas-liquid (mass ratio of argon gas and carbon tetrachloride is 8:1) passes through furnace bottom molten aluminum purification system to aluminum anodizing 26 minutes, then stands
10 minutes；The molten aluminum after standing is removed into the gas dissolved in molten aluminum by depassing unit later, then passes sequentially through deep-bed filtration
Device and tubular filter, molten aluminum detects H 0.12m1/100gA1, slag inclusion content 0.14mm at this time2/ 1kgAl, through semi-continuous casting
At rectangle ingot；
(2) gained rectangle ingot is put into behind sawing, milling face heating furnace, ingot casting is heated, metal temperature 480
DEG C, keep the temperature 4h, hot rolling of then coming out of the stove；
(3) aluminium after hot rolling rolls into the intermediate base of 32mm thickness through reversible hot rough rolling mill, on hot rough rolling mill entrance roller-way
Lower section has thermal isolating panel, makes the control of intermediate base temperature at 420 DEG C, then by finishing mill tandem rolling at the hot-rolled band of 8mm thickness,
Finishing mill finishing temperature control is slowly cooled to room temperature after 280 DEG C, hot rolled plate winding into holding furnace, cooling velocity 12
℃/h；
(4) slitting of coils of hot rolled longitudinal direction is batched to get GIL shell moderate strength aluminium alloy strips are arrived.
After tested, the tensile strength of the aluminium alloy strips is 162MPa, yield strength 135MPa, elongation percentage 20%, conduction
Rate 57.5%IACS.
Embodiment 2
A kind of GIL shell moderate strength aluminium alloy strips, the sum of weight percent are 100% meter, the weight of ingredient
Percentage are as follows: Si 0.95%, Fe 0.17%, Cu 0.01%, Mg 0.72%, Ti 0.01%, Cr 0.01%, Mn 0.01%, Zn
0.01%, surplus Al.
Preparation method comprises the steps of:
(1) intermediate alloys such as fine aluminium ingot, magnesium ingot, aluminium-silicon, aluminium-iron are added in smelting furnace, heating is fused into metal liquid
Afterwards, molten aluminum is sufficiently stirred using bottom type permanent magnetic stirrer, while uses the mixing of argon gas and carbon tetrachloride in furnace
Gas-liquid (mass ratio of argon gas and carbon tetrachloride is 8.5:1) passes through furnace bottom molten aluminum purification system to aluminum anodizing 25 minutes, then quiet
It sets 9 minutes；The molten aluminum after standing is removed into the gas dissolved in molten aluminum by depassing unit later, then passes sequentially through deep-bed filtration
Device and tubular filter, molten aluminum detects H 0.11m1/100gA1, slag inclusion content 0.135mm at this time2/ 1kgAl, through semicontinuous casting
Cause rectangle ingot；
(2) gained rectangle ingot is put into behind sawing, milling face heating furnace, ingot casting is heated, metal temperature 470
DEG C, keep the temperature 6h, hot rolling of then coming out of the stove；
(3) aluminium after hot rolling rolls into the intermediate base of 30mm thickness through reversible hot rough rolling mill, on hot rough rolling mill entrance roller-way
Lower section has thermal isolating panel, makes the control of intermediate base temperature at 410 DEG C, then by finishing mill tandem rolling at the hot-rolled band of 7mm thickness,
Finishing mill finishing temperature control is slowly cooled to room temperature after 260 DEG C, hot rolled plate winding into holding furnace, cooling velocity 10
℃/h；
(4) slitting of coils of hot rolled longitudinal direction is batched to get GIL shell moderate strength aluminium alloy strips are arrived.
After tested, the tensile strength of the aluminium alloy strips is 198MPa, yield strength 163MPa, elongation percentage 18%, conduction
Rate 58%IACS.
Embodiment 3
A kind of GIL shell moderate strength aluminium alloy strips, the sum of weight percent are 100% meter, the weight of ingredient
Percentage are as follows: Si 1.06%, Fe 0.177%, Cu 0.01%, Mg 0.81%, Ti 0.01%, Cr 0.01%, Mn 0.01%, Zn
0.01%, surplus Al.
Preparation method comprises the steps of:
(1) intermediate alloys such as fine aluminium ingot, magnesium ingot, aluminium-silicon, aluminium-iron are added in smelting furnace, heating is fused into metal liquid
Afterwards, molten aluminum is sufficiently stirred using bottom type permanent magnetic stirrer, while uses the mixing of argon gas and carbon tetrachloride in furnace
Gas-liquid (mass ratio of argon gas and carbon tetrachloride is 9:1) passes through furnace bottom molten aluminum purification system to aluminum anodizing 30 minutes, then stands
10 minutes；The molten aluminum after standing is removed into the gas dissolved in molten aluminum by depassing unit later, then passes sequentially through deep-bed filtration
Device and tubular filter, molten aluminum detects H 0.12m1/100gA1, slag inclusion content 0.13mm at this time2/ 1kgAl, through semi-continuous casting
At rectangle ingot；
(2) gained rectangle ingot is put into behind sawing, milling face heating furnace, ingot casting is heated, metal temperature 450
DEG C, keep the temperature 6h, hot rolling of then coming out of the stove；
(3) aluminium after hot rolling rolls into the intermediate base of 28mm thickness through reversible hot rough rolling mill, on hot rough rolling mill entrance roller-way
Lower section has thermal isolating panel, makes the control of intermediate base temperature at 400 DEG C, then by finishing mill tandem rolling at the hot-rolled band of 6mm thickness,
Finishing mill finishing temperature control is slowly cooled to room temperature after 270 DEG C, hot rolled plate winding into holding furnace, cooling velocity 14
℃/h；
(4) slitting of coils of hot rolled longitudinal direction is batched to get GIL shell moderate strength aluminium alloy strips are arrived.
After tested, the tensile strength of the aluminium alloy strips is 174MPa, yield strength 142MPa, elongation percentage 19%, conduction
Rate 57.5%IACS.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (7)
1. a kind of GIL shell moderate strength aluminium alloy strips, it is characterised in that: the sum of weight percent is 100% meter,
The weight percent of contained each chemical component are as follows: Si 0.90 ~ 1.10%, Fe 0.10 ~ 0.20%, Cu≤0.05%, Mg 0.60 ~
0.90%, Ti≤0.01%, Cr≤0.03%, Mn≤0.03%, Zn≤0.03%, surplus Al.
2. a kind of preparation method of GIL shell moderate strength aluminium alloy strips as described in claim 1, it is characterised in that: packet
Containing following steps:
(1) fine aluminium ingot, magnesium ingot, aluminium-silicon intermediate alloy and aluminium-iron intermediate alloy are added in smelting furnace, heating is fused into gold
After belonging to liquid, furnace bottom molten aluminum purification system is passed through to aluminum anodizing 20- using the gas-liquid mixture of argon gas and carbon tetrachloride in furnace
30 minutes, then stand 5-10 minutes；The molten aluminum after standing is removed into the gas that dissolves in molten aluminum by depassing unit later, then according to
It is secondary that semi-continuous casting device is imported by deep-bed filter and tubular filter, it is cast as rectangle ingot；
(2) gained rectangle ingot is put into behind sawing, milling face heating furnace, ingot casting is heated, hot rolling of then coming out of the stove；
(3) aluminium after hot rolling is rolled into the intermediate base of 28-32mm thickness through reversible hot rough rolling mill, intermediate base temperature control exists
400-430 DEG C, then by finishing mill tandem rolling at the hot-rolled band of 4.0-10mm thickness, finishing mill finishing temperature control is in 260-290
DEG C, it is slowly cooled to room temperature in holding furnace after winding；
(4) slitting of coils of hot rolled longitudinal direction is batched to get GIL shell moderate strength aluminium alloy strips are arrived.
3. the preparation method of GIL shell moderate strength aluminium alloy strips according to claim 2, it is characterised in that: step
(1) mass ratio of argon gas and carbon tetrachloride is 8-9:1 in the gas-liquid mixture of argon gas described in and carbon tetrachloride.
4. the preparation method of GIL shell moderate strength aluminium alloy strips according to claim 2, it is characterised in that: step
(1) when heating fusing, molten aluminum is sufficiently stirred using bottom type permanent magnetic stirrer；H < 0.13m1/ in molten aluminum after filtering
100gA1, slag inclusion content≤0.15mm2/1kg Al。
5. the preparation method of GIL shell moderate strength aluminium alloy strips according to claim 2, it is characterised in that: step
(2) temperature heated in is 440-480 DEG C, time 2-10h.
6. the preparation method of GIL shell moderate strength aluminium alloy strips according to claim 2, it is characterised in that: step
(3) the entrance roller-way upper and lower of hot rough rolling mill used has thermal isolating panel in, to reduce the heat loss of intermediate base.
7. the preparation method of GIL shell moderate strength aluminium alloy strips according to claim 2, it is characterised in that: step
(3) after winding, the speed being cooled to room temperature is no more than 15 DEG C/h.
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| CN201811287896.0A CN109234584B (en) | 2018-10-31 | 2018-10-31 | Medium-strength aluminum alloy strip for GIL shell and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811287896.0A CN109234584B (en) | 2018-10-31 | 2018-10-31 | Medium-strength aluminum alloy strip for GIL shell and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532077A (en) * | 2014-11-28 | 2015-04-22 | 苏州有色金属研究院有限公司 | Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines |
| CN107338376A (en) * | 2017-07-11 | 2017-11-10 | 中铝瑞闽股份有限公司 | A kind of preparation method of aluminium alloy compartment sheet material |
| CN108486436A (en) * | 2018-06-12 | 2018-09-04 | 中铝东南材料院（福建）科技有限公司 | A kind of high-performance aluminium alloy band and preparation method thereof |
-
2018
- 2018-10-31 CN CN201811287896.0A patent/CN109234584B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532077A (en) * | 2014-11-28 | 2015-04-22 | 苏州有色金属研究院有限公司 | Short-flow preparation method for 6XXX-series aluminum alloy automotive body sheet without paint brushed lines |
| CN107338376A (en) * | 2017-07-11 | 2017-11-10 | 中铝瑞闽股份有限公司 | A kind of preparation method of aluminium alloy compartment sheet material |
| CN108486436A (en) * | 2018-06-12 | 2018-09-04 | 中铝东南材料院（福建）科技有限公司 | A kind of high-performance aluminium alloy band and preparation method thereof |
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