CN1609247A - High strength aluminium alloy and producing process - Google Patents

High strength aluminium alloy and producing process Download PDF

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Publication number
CN1609247A
CN1609247A CN 200310110444 CN200310110444A CN1609247A CN 1609247 A CN1609247 A CN 1609247A CN 200310110444 CN200310110444 CN 200310110444 CN 200310110444 A CN200310110444 A CN 200310110444A CN 1609247 A CN1609247 A CN 1609247A
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CN
China
Prior art keywords
aldural
alloy
production
equipment
casting
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CN 200310110444
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Chinese (zh)
Inventor
张辉
高崧云
熊晟
詹自勤
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湖南百富瑞材料有限责任公司
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Priority to CN 200310110444 priority Critical patent/CN1609247A/en
Publication of CN1609247A publication Critical patent/CN1609247A/en

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Abstract

The high strength alloy for building section consists of Al in 95.75-96.5 wt% and M in 2.95-3.7, with M being Mg, Si, Cu and Fe. The production process of the alloy includes the following key steps: compounding based on the formulation, smelting, semi-continuous casting, hot extruding to form, on-line water quenching, and artificial ageing. The Al alloy thus produced has tensile and compression strength over 320 MPa, yield strength over 270 MPa, elongation over 10 %, and excellent corrosion resistance, extrusion performance and weldability.

Description

A kind of aldural and production method
Technical field
The present invention relates to a kind of aldural architectural shape and production method, particularly relate to a kind of aldural architectural shape and production method that is applied to building trade.
Background technology
At present, the tensile strength of each national Specification of building trade aluminium alloy extrusions is between 150~160MPa, for proof strength, has to increase the wall thickness of section bar, and there are two drawbacks in this:
(1) linear density of section bar increases, and has strengthened user's cost burden.
(2) consumed a large amount of resources meaninglessly.
(3) can't be used for high-strength structure spare.
Summary of the invention
Technical problem to be solved by this invention provides a kind of novel aluminum alloy and corresponding section bar plastic making complete processing, thereby improves the tensile strength of aluminum alloy building section and yield strength, unit elongation greatly, has corrosion-resistantly, characteristic such as can weld.
The objective of the invention is to realize by following manner:
For obtaining high-intensity aluminum alloy building section, the composition of the aldural that the present invention adopts comprises Al, M, and content is Al:95.75-96.5% by weight percentage, and M is 2.95-3.7%, and M is Mg, Si, Cu, Fe.
Described aluminium alloy composition also comprises N, and the content of N then is not higher than 0.55%, and N is Mn, Cr, V.
Among the composition M, wherein Mg 0.9~1.6%, Si 0.7~1.0%, Cu 0.1~0.8%, Fe0.2~0.8%; To account for whole weight alloy.
Among the composition N, wherein Mn is not higher than 0.3%, Cr is not higher than 0.3, V is not higher than 0.3%; To account for whole weight alloy.
The composition prescription of the novel aluminum alloy that the present invention adopts is the tissue that the Chemical Composition of alloy has determined aluminium alloy extrusions to a certain extent, constitutes mechanical property, solidity to corrosion, press workability and weldability mutually.The novel aluminum alloy that the present invention adopts has added the copper of high level on the basis of Al-Mg-Si system (6000 are), change phase s-CuMgAl by force mutually so that produce solid solution 2And θ-CuAl 2With precipitation strength Mg mutually 2Si adds the detrimentally affect that Cr or Mn reduce silicon, adds the detrimentally affect that Fe, V reduce silicon, increases plasticity, reasonably is equipped with alloy element and is novel aluminum alloy intensity height and the good basis of solidity to corrosion and weldability.The main strengthening phase of alloy is s-CuMgAl 2Phase, Mg 2Si phase and θ-CuAl 2, their relative proportion, disperse degree, form and size depend primarily on alloy ingredient proportioning and heat treating regime.Mg 2Form fine particle during Si phase timeliness, alloy is played strengthening effect; CuAl 2Can improve alloy strength mutually, but corrosion stability is had detrimentally affect, add proper C r or Mn and can offset the influence of Cu corrosion stability.The equilibrium composition of Al-Mg-Si alloy is: magnesium/silicon=1.73; The excessive post precipitation of silicon has strengthening effect, but causes grain boundary segregation, causes that alloy embrittlement reduces plasticity, adds the detrimentally affect that Cr in right amount or Mn help to reduce silicon.Therefore alloy ingredient optimization proportioning and microstructures Control are gordian techniquies of the present invention, also are the core technologies of abroad not announcing.
Technological process of the present invention is:
1, gets above-mentioned alloy ingredient proportioning
2, melting
3, semicontinuous casting
4, hot-pressed
5, online shrend (or solution heat treatment)
6, artificial aging
The melting equipment oil-fired air-furnace that the present invention adopts, one of electric arc furnace, smelting temperature are 720~760 ℃.
The semicontinuous casting equipment that the present invention adopts is hot direct casting manufacturing apparatus, and the ingot casting diameter is Φ 80~200mm, and casting speed is 70~230mm/min, and cooling water pressure is 0.2~0.8Mpa.Ingot structure has hereditation to the tissue and the performance of extruded section, and uniform crystal particles is tiny, segregation-free, flawless ingot structure are best tissue, and therefore selecting suitable castmethod and processing parameter is the assurance that obtains satisfied ingot structure.
The hot-pressed equipment that the present invention adopts is the forward extrusion machine, indirect extrusion machine, and one of forward and reverse extrusion machine, squeeze is 800~4000 tons, the extruding temperature out is 450 ℃~540 ℃
The online shrend equipment that the present invention adopts is two-way water curtain, and cooling water pressure is 0.2~0.8MPa, coolant water temperature<35 ℃, and speed of cooling is 100~200 ℃/min.
The solution heat treatment equipment that the present invention adopts is the tunnel resistor stove, and one of cycling hot wind furnace, power are 150~500KW, and thermal treatment temp is 450 ℃~580 ℃, and heat treatment time is 2~8h.Aldural architectural shape of the present invention belongs to the 6XXX series alloys that thermal treatment can be strengthened, and contains alloying element Mg, the Si that can dissolve in the aluminium, Cu, Fe, Mn, Cr, V etc., and main alloy element is Mg, Si, Cu, and main strengthening phase is Mg 2Si, CuAl 2After coming out, cools off by section bar self compaction tube with enough big speed, the diffusion of solute atoms and redistribute and have little time to carry out, strengthening phase just can not forming core with grow up, αGu Rongti just can not be settled out strengthening phase, thereby obtain the single-phase supersaturated solid solution of α, and guarantee that the substructure grain-size is tiny, handling for follow-up artificial aging provides the favorable tissue structural condition.Control extruding temperature out and quench cooling rate are to guarantee that alloy product obtains the important process factor of excellent over-all properties.Aldural architectural shape of the present invention intensity raising behind press quenching keeps higher plasticity simultaneously.
The artificial aging equipment that the present invention adopts is the tunnel resistor stove, and one of cycling hot wind furnace, power are 150~500KW, and aging temp is 120~200 ℃, and aging time is 12~36h; Aldural architectural shape of the present invention is after artificial aging is handled, ageing strengthening can take place, rational artificial aging is handled the effect that system can guarantee to give full play to the alloy strengthening phase, the plasticity of the intensity that acquisition is maximum and the best and the good solidity to corrosion and the combination of weldability.The optimization of aging temp and time is important technical parameters.
More than the tension pressure Du Keda 320MPa of the aluminum alloy building section that Using such method is produced, yield strength can reach more than the 270MPa, is more than 2 times of existing each national standard, and unit elongation can reach more than 10%, and has good solidity to corrosion, press workability and weldability.
Embodiment
Embodiment 1
At first carry out melting, adopt oil-fired air-furnace melting aluminium ingot, magnesium ingot and master alloy, wherein aluminium ingot 8846kg, magnesium ingot 174kg, Al-Si master alloy 480kg, Al-Cu master alloy 335kg, Al-Fe master alloy 115kg, Al-Mn master alloy 50kg is that Mg1.45%, Si 0.96%, Cu 0.67%, Fe 0.45%, Mn0.08% surplus are Al through the on-the-spot sample analysis alloy ingredient; Smelting temperature is 730 ℃; Then adopt hot direct casting manufacturing apparatus to carry out semicontinuous casting, the casting diameter is Φ 110mm, and casting speed is 135mm/min, and cooling water pressure is 0.6MPa; It is hot-pressed to adopt the forward extrusion machine to carry out, and squeeze is 1000t, and the extruding temperature out is 540 ℃; Adopt two-way water curtain to carry out online shrend, cooling water pressure is 0.6MPa, coolant water temperature<35 ℃, and speed of cooling is 140 ℃/min; Adopt the cycling hot wind furnace to carry out artificial aging and handle, aging temp is 175 ℃, and aging time is 24h.
Tensile strength under the aluminum alloy building section T5 state that Using such method is produced reaches 320MPa, yield strength reaches 270MPa, be 2 times of common aluminum alloy architectural shape 6063-T5, unit elongation reaches 12%, and has good solidity to corrosion (anti-neutral salt spray corrosion test reaches a level) and weldability (welding coefficient reaches more than 0.75).
Embodiment 2
Adopt oil-fired air-furnace melting aluminium ingot, magnesium ingot and master alloy, wherein aluminium ingot 8769kg, magnesium ingot 156kg, Al-Si master alloy 450kg, Al-Cu master alloy 350kg, Al-Fe master alloy 100kg, Al-Mn master alloy 50kg, Al-Cr master alloy 50kg, Al-V master alloy 75kg, smelting temperature is 740 ℃, is that Mg1.3%, Si 0.9%, Cu 0.7%, Fe 0.4%, Mn0.08%, Cr 0.1%, V 0.15%, surplus are Al through the on-the-spot sample analysis alloy ingredient; Adopt hot direct casting manufacturing apparatus to carry out semicontinuous casting, the casting diameter is Φ 120mm, and casting speed is 120mm/min, and cooling water pressure is 0.6MPa; It is hot-pressed to adopt the forward extrusion machine to carry out, and squeeze is 1600t, and the extruding temperature out is 525 ℃; Adopt the tunnel resistor stove to carry out solution heat treatment, power is 150KW, and thermal treatment temp is 543 ℃, and heat treatment time is 2h; Adopt the cycling hot wind furnace to carry out artificial aging and handle, aging temp is 200 ℃, and aging time is 12h.
Tensile strength under the aluminum alloy building section T5 state that Using such method is produced reaches 325MPa, yield strength reaches 275MPa, be more than 2 times of common aluminum alloy architectural shape 6063-T5, unit elongation reaches 12%, and has good solidity to corrosion (anti-neutral salt spray corrosion test reaches a level) and weldability (welding coefficient reaches more than 0.8).

Claims (10)

1, a kind of aldural, its composition comprises Al, M, and content is Al:95.75-96.5% by weight percentage, and M is 2.95-3.7%, and described M is Mg, Si, Cu, Fe.
2, a kind of aldural according to claim 1, described aluminium alloy composition also comprises N, and the content of N then is not higher than 0.55%, and to account for whole weight alloy, N is Mn, Cr, V.
3, a kind of aldural according to claim 1, among the composition M, wherein Mg 0.9~1.6%, Si 0.7~1.0%, Cu 0.1~0.8%, Fe 0.2~0.8%; To account for whole weight alloy.
4, according to right 2 described a kind of aldurals, among the composition N, wherein Mn is not higher than 0.3%, Cr is not higher than 0.3%, V is not higher than 0.3%; To account for whole weight alloy.
5, may further comprise the steps according to arbitrary its production method of described aldural of claim 1 to 4:
A, get alloy proportion
B, melting
C, semicontinuous casting
D, hot-pressed
E, online shrend (or solution heat treatment)
F, artificial aging
6, a kind of aldural architectural shape according to claim 5 and production method is characterized in that the present invention adopts one of melting equipment oil-fired air-furnace, electric arc furnace, and smelting temperature is 720~760 ℃.
7, the production method of a kind of aldural according to claim 5, adopting semicontinuous casting equipment is hot direct casting manufacturing apparatus, and the ingot casting diameter is Φ 80~200mm, and casting speed is 70~230mm/min, and cooling water pressure is 0.2~0.8MPa.
8, the production method of a kind of aldural according to claim 5, the hot-pressed equipment of employing is the forward extrusion machine, indirect extrusion machine, one of forward and reverse extrusion machine, squeeze is 800~4000 tons, the extruding temperature out is 450 ℃~540 ℃.
9, a kind of aldural architectural shape according to claim 5 and production method, adopting online shrend equipment is two-way water curtain, cooling water pressure is 0.2~0.8MPa, coolant water temperature<35 ℃, speed of cooling is 100~200 ℃/min, or the solution heat treatment equipment that adopts is the tunnel resistor stove, one of cycling hot wind furnace, power is 150~500KW, and thermal treatment temp is 450 ℃~580 ℃, and heat treatment time is 2~8h.
10, a kind of aldural architectural shape according to claim 5 and production method, it is characterized in that the artificial aging equipment that the present invention adopts is the tunnel resistor stove, one of cycling hot wind furnace, power are 150~500KW, aging temp is 120~200 ℃, and aging time is 12~36h.
CN 200310110444 2003-10-22 2003-10-22 High strength aluminium alloy and producing process CN1609247A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101082115B (en) * 2007-05-25 2010-05-19 中南大学 Treatment method for providing aluminum alloy with high thermal stability anti-fatigue microstructure
CN102319756A (en) * 2011-09-05 2012-01-18 西南铝业(集团)有限责任公司 A kind of manufacturing approach of rods and bars of aluminium alloy
CN102329999A (en) * 2011-07-30 2012-01-25 湖南晟通科技集团有限公司 Manufacture method of electroconductive aluminum alloy section
CN102935494A (en) * 2012-11-13 2013-02-20 东北轻合金有限责任公司 Method for producing small-dimension aluminum alloy round ingot
CN103537502A (en) * 2013-11-04 2014-01-29 张家港市昊天金属科技有限公司 Aluminium profile extrusion process
CN103551409A (en) * 2013-11-04 2014-02-05 张家港市昊天金属科技有限公司 Hollow aluminium profile manufacturing method
CN103769551A (en) * 2014-01-17 2014-05-07 新疆众和股份有限公司 Production process of aluminum-silicon-magnesium casting aluminum alloy
CN104271289A (en) * 2012-03-07 2015-01-07 美铝公司 Improved aluminum alloys containing magnesium, silicon, manganese, iron, and copper, and methods for producing the same
CN104438427A (en) * 2013-02-27 2015-03-25 滁州华尊电气科技有限公司 Method for preparing buses for electrical engineering
CN107245560A (en) * 2017-06-16 2017-10-13 江苏国铝高科铝业有限公司 A kind of aluminium alloy plate press quenching Processes and apparatus
CN107427109A (en) * 2015-03-27 2017-12-01 Ykk株式会社 Slide fastener chain tooth
CN107739921A (en) * 2017-09-26 2018-02-27 辽宁忠旺集团有限公司 A kind of automobile high-strength aluminium section bar and its production technology

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101082115B (en) * 2007-05-25 2010-05-19 中南大学 Treatment method for providing aluminum alloy with high thermal stability anti-fatigue microstructure
CN102329999A (en) * 2011-07-30 2012-01-25 湖南晟通科技集团有限公司 Manufacture method of electroconductive aluminum alloy section
CN102319756A (en) * 2011-09-05 2012-01-18 西南铝业(集团)有限责任公司 A kind of manufacturing approach of rods and bars of aluminium alloy
CN104271289A (en) * 2012-03-07 2015-01-07 美铝公司 Improved aluminum alloys containing magnesium, silicon, manganese, iron, and copper, and methods for producing the same
CN102935494A (en) * 2012-11-13 2013-02-20 东北轻合金有限责任公司 Method for producing small-dimension aluminum alloy round ingot
CN104438427B (en) * 2013-02-27 2016-12-07 国网山东省电力公司菏泽供电公司 The preparation method of electrician's bus
CN104438427A (en) * 2013-02-27 2015-03-25 滁州华尊电气科技有限公司 Method for preparing buses for electrical engineering
CN103551409A (en) * 2013-11-04 2014-02-05 张家港市昊天金属科技有限公司 Hollow aluminium profile manufacturing method
CN103537502A (en) * 2013-11-04 2014-01-29 张家港市昊天金属科技有限公司 Aluminium profile extrusion process
CN103769551A (en) * 2014-01-17 2014-05-07 新疆众和股份有限公司 Production process of aluminum-silicon-magnesium casting aluminum alloy
CN103769551B (en) * 2014-01-17 2016-03-30 新疆众和股份有限公司 The production technology of a kind of aluminium silicon magnesium system Birmasil
CN107427109A (en) * 2015-03-27 2017-12-01 Ykk株式会社 Slide fastener chain tooth
US10786051B2 (en) * 2015-03-27 2020-09-29 Ykk Corporation Element for slide fastener
CN107245560A (en) * 2017-06-16 2017-10-13 江苏国铝高科铝业有限公司 A kind of aluminium alloy plate press quenching Processes and apparatus
CN107739921A (en) * 2017-09-26 2018-02-27 辽宁忠旺集团有限公司 A kind of automobile high-strength aluminium section bar and its production technology

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