CN107815568A - A kind of high conductivity almag and preparation method thereof - Google Patents

A kind of high conductivity almag and preparation method thereof Download PDF

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Publication number
CN107815568A
CN107815568A CN201711126421.9A CN201711126421A CN107815568A CN 107815568 A CN107815568 A CN 107815568A CN 201711126421 A CN201711126421 A CN 201711126421A CN 107815568 A CN107815568 A CN 107815568A
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CN
China
Prior art keywords
almag
aluminium
magnesium alloy
refining
alloy melt
Prior art date
Application number
CN201711126421.9A
Other languages
Chinese (zh)
Inventor
张义
杨直达
李玉博
王飞
曾招芬
闫海亮
齐文刚
赵飞
徐驰
郭富安
姜远军
Original Assignee
天津忠旺铝业有限公司
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Application filed by 天津忠旺铝业有限公司 filed Critical 天津忠旺铝业有限公司
Priority to CN201711126421.9A priority Critical patent/CN107815568A/en
Publication of CN107815568A publication Critical patent/CN107815568A/en

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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon

Abstract

The invention belongs to technical field of aluminum alloy technology, is related to a kind of high conductivity almag and preparation method thereof, and the weight/mass percentage composition ratio of each element is in aluminium-magnesium alloy sheet:Si≤0.1%, Fe≤0.15%, Cu≤0.002%, Mn≤0.15%, Mg:2.50~2.80%, Cr≤0.03%, Zn≤0.006%, Ti≤0.015%, single impurity≤0.05%, total impurities≤0.15%, surplus is Al, the almag ingot casting of above-mentioned alloying component is heated in 450~540 DEG C of temperature range, control finishing temperature is in 290~340 DEG C of temperature range.The present invention can make the electrical conductivity of aluminium-magnesium alloy sheet reach more than 36%IACS by adjusting almag composition and rolling mill practice, while tensile strength reaches 190~240MPa, and yield strength is more than or equal to 80MPa, and elongation percentage is more than or equal to 18%.

Description

A kind of high conductivity almag and preparation method thereof

Technical field

The invention belongs to technical field of aluminum alloy technology, is related to a kind of high conductivity almag and preparation method thereof.

Background technology

GIL (gas-insulated metal closed power transmission line) is one kind of long range large capacity transmission circuit, and overhead power transmission The difference of line is that GIL is to be buried in underground, therefore is not restricted by environmental factors such as harsh weather and extreme terrains, simultaneously It does not have electromagnetic effect substantially to environment.So GIL has the trend for substituting existing overhead transmission line.

GIL is made up of shell and coaxial conductor, and inside is used to insulate full of SF6 gases or N2 gaseous mixtures.Conductor casing is Aluminium alloy spiral welded pipe.5 line aluminium alloys have higher intensity, good corrosion-resistant and weldability, are the first choices for manufacturing welded tube Material.

During power transmission, housing is vortexed heat because being produced by the effect of alternating magnetic field caused by conductor, from And raise the temperature of housing.Housing be embedded to underground, heat do not allow it is easy to lose, if constant temperature rise may threaten GIL's Normal operation.It is desirable to housing electrical conductivity is the higher the better, to reduce vortex heat, to ensure the normal operation of transmission line of electricity.

At present, client proposes that the electrical conductivity of aluminium alloy spiral welded pipe need to be more than 36%IACS, while tensile strength need to be 190~240MPa, yield strength need to be more than or equal to 80MPa, and elongation percentage is more than or equal to 18%.

The content of the invention

In view of this, the present invention is relatively low in order to solve the electrical conductivity of aluminium alloy spiral welded pipe, and embedment is vortexed caused by underground Heat is larger, a kind of the problem of influenceing transmission line of electricity normal operation, there is provided high conductivity almag and preparation method thereof.

To reach above-mentioned purpose, a kind of high conductivity almag of present invention offer, including following weight/mass percentage composition Component:Si≤0.1%, Fe≤0.15%, Cu≤0.002%, Mn≤0.15%, Mg:2.50~2.80%, Cr≤0.03%, Zn≤0.006%, Ti≤0.015%, single impurity≤0.05%, total impurities≤0.15%, surplus Al.

Further, the component of following weight/mass percentage composition is included:Si:0.04~0.05%, Fe:0.12~0.15%, Cu ≤ 0.002%, Mn:0.01~0.15%, Mg:2.50~2.70%, Cr:0.01~0.03%, Zn≤0.006%, Ti: 0.005~0.015%, single impurity≤0.05%, total impurities≤0.15%, surplus Al.

Further, the component of following weight/mass percentage composition is included:Si:0.043~0.046%, Fe:0.125~0.14%, Cu:0.002%th, Mn:0.01~0.15%, Mg:2.59~2.70%, Cr:0.012~0.024%, Zn:0.006%th, Ti: 0.008~0.011%, single impurity≤0.03%, total impurities≤0.10%, surplus Al.

A kind of preparation method of high conductivity almag, comprises the following steps:

A, dispensing:Calculate almag raw material dosage and prepare almag raw material according to proportioning;

B, melting refines:The almag raw material prepared is placed in melting in smelting furnace, the melting of almag raw material Temperature is 720~750 DEG C, and the aluminium-magnesium alloy melt after melting is poured into refining furnace and refined, and refining temperature is 720~740 DEG C, Refining time is 20min, and the aluminium alloy melt after refining stands 20min at 720 DEG C;

C, degasification cleans:High purity inert gas will be passed through in aluminium-magnesium alloy melt after refining and stirs melt, remove aluminium Foreign gas in magnesium alloy fused mass, the foamed ceramic filter plate by the aluminium-magnesium alloy melt after degasification by aperture >=50ppi Filtering, filtration temperature are 720 DEG C;

D, online refinement:Aluminium titanium boron wire is added in aluminium-magnesium alloy melt after degasification is cleaned and carries out online refinement, will be Aluminium-magnesium alloy melt after line thinning is cast into almag ingot casting;

E, hot rolling:Almag ingot casting after casting is incubated after 2h rolling of coming out of the stove, hot rolling finish to gauge temperature at 450~540 DEG C Spend for 290~340 DEG C, obtain aluminium-magnesium alloy sheet.

Further, to be stirred, skim in almag raw material fusion process in step B, aluminium-magnesium alloy melt refining During to be also stirred, skim.

Further, the inert gas in step C is argon gas.

The beneficial effects of the present invention are:

1st, aluminium alloy spiral welded pipe of the present invention is a kind of 5 line aluminium alloys with the almag of high conductivity, 5 line aluminium alloys Electrical conductivity and intensity are relevant with the alloying level of aluminium alloy, and alloying level more low conductivity is higher, but intensity of aluminum alloy Lower, vice versa.The present invention is meeting the same of electrical conductivity by adjusting alloying component come equilibrium conductivity and the relation of intensity When also meet the requirement of intensity of aluminum alloy.

2nd, the high conductivity aluminium-magnesium alloy sheet that is produced of the present invention, main alloying component have Si, Fe, Mn, Mg, Cr and Other micro impurity.Si, Fe are impurity, and content is more few better, for the ease of casting, Si≤0.1%, Fe≤0.15%.Mn Electrical conductivity is had a great influence, answers≤0.15%.Mg is main alloying element, play a part of improve intensity, composition range be 2.5~ 2.8%.Cr has a great influence to electrical conductivity, and content need to be less than 0.03%, and other impurities element all should be less than 0.03%.By it is above-mentioned into The almag ingot casting divided heats in 450~540 DEG C of temperature range, humidity province of the control finishing temperature at 290~340 DEG C In.The sheet material met customer need can be obtained substantially by adjusting almag composition and production technology.Almag plate Material electrical conductivity can reach more than 36%IACS, and highest can reach 40.3%IACS, at the same tensile strength reach 190~ 240MPa, yield strength are more than 80MPa, and elongation percentage is more than 18%.

Embodiment

The preferred embodiments of the present invention will be described in detail below.

Embodiment 1

A kind of preparation method of high conductivity almag, comprises the following steps:

A, dispensing:According to following mass percent dispensing:Si:0.046%th, Fe:0.14%th, Cu:0.002%th, Mn: 0.01%th, Mg:2.50%th, Cr:0.024%th, Zn:0.006%th, Ti:0.008%, single impurity≤0.05%, total impurities≤ 0.15%, surplus Al;

B, melting refines:The almag raw material prepared is placed in melting in smelting furnace, the melting of almag raw material Temperature is 750 DEG C, and the aluminium-magnesium alloy melt after melting is poured into refining furnace and refined, and refining temperature is 730 DEG C, and refining time is 20min, the aluminium alloy melt after refining stand 20min at 720 DEG C;

C, degasification cleans:High purity inert gas will be passed through in aluminium-magnesium alloy melt after refining and stirs melt, remove aluminium Foreign gas in magnesium alloy fused mass, the foamed ceramic filter plate by the aluminium-magnesium alloy melt after degasification by aperture >=50ppi Filtering, filtration temperature are 720 DEG C;

D, online refinement:Aluminium titanium boron wire is added in aluminium-magnesium alloy melt after degasification is cleaned and carries out online refinement, will be Aluminium-magnesium alloy melt after line thinning is cast into almag ingot casting;

E, hot rolling:Almag ingot casting after casting is incubated after 2h rolling of coming out of the stove at 450 DEG C, hot rolling finishing temperature is 330 DEG C, obtain aluminium-magnesium alloy sheet.

Embodiment 2

The difference of embodiment 2 and embodiment 1 is that the almag ingot casting after being cast in step E is after 540 DEG C are incubated 2h Come out of the stove rolling, hot rolling finishing temperature is 340 DEG C.

Embodiment 3

The difference of embodiment 3 and embodiment 1 is, according to following mass percent dispensing in step A:Si:0.043%th, Fe:0.125%th, Cu:0.002%th, Mn:0.15%th, Mg:2.8%th, Cr:0.012%th, Zn:0.006%th, Ti:0.011%, it is single Individual impurity≤0.05%, total impurities≤0.15%, surplus Al.

Almag ingot casting after being cast in step E is come out of the stove rolling after being incubated 2h at 500 DEG C, hot rolling finishing temperature 330 ℃。

Embodiment 4

The difference of embodiment 4 and embodiment 3 is that the almag ingot casting after being cast in step E is after 450 DEG C are incubated 2h Come out of the stove rolling, hot rolling finishing temperature is 290 DEG C.

Embodiment 5

The difference of embodiment 5 and embodiment 3 is that the almag ingot casting after being cast in step E is after 540 DEG C are incubated 2h Come out of the stove rolling, hot rolling finishing temperature is 320 DEG C.

The mechanical property and conductivity test knot for the aluminium alloy spiral welded pipe aluminium-magnesium alloy sheet that embodiment 1~5 obtains Fruit is shown in Table one:

Table one

Embodiment 1 Embodiment 2 Embodiment 3 Embodiment 4 Embodiment 5 Tensile strength (MPa) 196 193 190 220 190 Yield strength (MPa) 88 86 80 147 87 Elongation percentage (%) 35 36 35 26 34 Electrical conductivity (%IACS) 40.2 40.3 37.2 37.4 37.4

Satisfaction visitor it can be seen that, can be obtained by table one substantially by present invention adjustment almag composition and production technology The aluminium-magnesium alloy sheet of family demand.Aluminium-magnesium alloy sheet electrical conductivity can reach more than 36%IACS, and highest can reach 40.3%IACS.For tensile strength substantially in 190~240MPa, yield strength is more than 80MPa simultaneously, and elongation percentage is more than 18%.It is logical The intensity and electrical conductivity for crossing the aluminium alloy spiral welded pipe of aluminium-magnesium alloy sheet production have reached doulbe-sides' victory, fully meet the life of client Production demand.

Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (2)

1. a kind of high conductivity almag, it is characterised in that include the component of following weight/mass percentage composition:Si≤0.1%, Fe ≤ 0.15%, Cu≤0.002%, Mn≤0.15%, Mg:2.50~2.80%, Cr≤0.03%, Zn≤0.006%, Ti≤ 0.015%, single impurity≤0.05%, total impurities≤0.15%, surplus Al.
2. a kind of preparation method of high conductivity almag as claimed in claim 1, it is characterised in that comprise the following steps:
A, dispensing:Calculate almag raw material dosage and prepare almag raw material according to proportioning;
B, melting refines:The almag raw material prepared is placed in melting in smelting furnace, the smelting temperature of almag raw material For 720~750 DEG C, the aluminium-magnesium alloy melt after melting is poured into refining furnace and refined, refining temperature is 720~740 DEG C, refining Time is 20min, and the aluminium alloy melt after refining stands 20min at 720 DEG C;
C, degasification cleans:High purity inert gas will be passed through in aluminium-magnesium alloy melt after refining and stirs melt, removed magnalium and close Foreign gas in golden melt, the aluminium-magnesium alloy melt after degasification is filtered by aperture >=50ppi foamed ceramic filter plate, Filtration temperature is 720 DEG C;
D, online refinement:Aluminium titanium boron wire is added in aluminium-magnesium alloy melt after degasification is cleaned and carries out online refinement, will be thin online Aluminium-magnesium alloy melt after change is cast into almag ingot casting;
E, hot rolling:Almag ingot casting after casting is incubated after 2h rolling of coming out of the stove at 450~540 DEG C, hot rolling finishing temperature is 290~340 DEG C, obtain aluminium-magnesium alloy sheet.
CN201711126421.9A 2017-11-14 2017-11-14 A kind of high conductivity almag and preparation method thereof CN107815568A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109055787A (en) * 2018-08-29 2018-12-21 天津忠旺铝业有限公司 A kind of preparation process controlling almag thin plate grain size
CN110184511A (en) * 2019-06-25 2019-08-30 天津忠旺铝业有限公司 A kind of preparation method of high-pressure spiral welded tube aluminum alloy coiled materials

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CN101880803A (en) * 2010-07-30 2010-11-10 浙江巨科铝业有限公司 Al-Mg alloys for automobile body sheets and manufacturing method thereof
CN103436747A (en) * 2013-08-07 2013-12-11 江阴新仁科技有限公司 High-plasticity aluminum alloy for heat exchange fin plate and processing technology of high-plasticity aluminum alloy
CN105543520A (en) * 2015-12-31 2016-05-04 广西南南铝加工有限公司 Preparing method of aluminum alloy base material for electronic product shell
CN107299263A (en) * 2017-06-22 2017-10-27 天津忠旺铝业有限公司 It is a kind of to be used to manufacture almag of tank body and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN101880803A (en) * 2010-07-30 2010-11-10 浙江巨科铝业有限公司 Al-Mg alloys for automobile body sheets and manufacturing method thereof
CN103436747A (en) * 2013-08-07 2013-12-11 江阴新仁科技有限公司 High-plasticity aluminum alloy for heat exchange fin plate and processing technology of high-plasticity aluminum alloy
CN105543520A (en) * 2015-12-31 2016-05-04 广西南南铝加工有限公司 Preparing method of aluminum alloy base material for electronic product shell
CN107299263A (en) * 2017-06-22 2017-10-27 天津忠旺铝业有限公司 It is a kind of to be used to manufacture almag of tank body and preparation method thereof

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《工程材料实用手册》编辑委员会: "《工程材料实用手册 第3卷 铝合金 镁合金 第2版》", 31 August 2002, 中国标准出版社 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN109055787A (en) * 2018-08-29 2018-12-21 天津忠旺铝业有限公司 A kind of preparation process controlling almag thin plate grain size
CN110184511A (en) * 2019-06-25 2019-08-30 天津忠旺铝业有限公司 A kind of preparation method of high-pressure spiral welded tube aluminum alloy coiled materials

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Application publication date: 20180320