CN103122428A - Brazing aluminum alloy composite pipe and production method thereof - Google Patents
Brazing aluminum alloy composite pipe and production method thereof Download PDFInfo
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- CN103122428A CN103122428A CN2011103689243A CN201110368924A CN103122428A CN 103122428 A CN103122428 A CN 103122428A CN 2011103689243 A CN2011103689243 A CN 2011103689243A CN 201110368924 A CN201110368924 A CN 201110368924A CN 103122428 A CN103122428 A CN 103122428A
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Abstract
The invention relates to core alloy of a brazing aluminum alloy composite pipe, a production method of the core alloy of the brazing aluminum alloy composite pipe, the brazing aluminum alloy composite pipe, a production method of the brazing aluminum alloy composite pipe and a production method of waterproof side alloy in the brazing aluminum alloy composite pipe. The brazing aluminum alloy composite pipe is characterized in that the core alloy does not contain Cr basically. The core alloy is prepared by using at least 20-60% of, by weight, brazing aluminum alloy waste materials are raw materials on the basis of gross weight of the raw materials and by means of fusion casting. The brazing aluminum alloy composite pipe is composed of the core alloy, brazing side alloy and the waterproof side alloy thereof.
Description
Technical field
The present invention relates to two-layer above Al alloy composite, the particularly tubing of suitable scatterer, condenser, described Al alloy composite is a kind of high-strength brazed aluminum radiator material.
Background technology
Aluminium alloy is widely used in car heat exchanger due to light weight and high heat conductivity, such as scatterer, condenser, vaporizer, oil cooler and side cooler etc.Car heat exchanger mainly comprises vacuum brazing and controlled atmosphere soldering mainly by method for brazing production.Usually, soldering uses Al-Si to be associated gold as solder, and brazing temperature is 600 ℃ of left and right, and this moment, solder melted fully, carried out metallurgical binding by the solder butt junction.
In recent years, along with the lightweight requirements to automobile, automobile also requires lightweight with interchanger, and then requires interchanger to carry out attenuate with Al alloy composite, and the lightweight of its reduced thickness heat exchanger has great importance.But attenuate is had higher requirement with Al alloy composite to soldering, will satisfy the strength of materials and corrosive nature does not reduce when reducing thickness.And if tubing is bored a hole owing to corroding or destroying in use, can cause the leakage of the liquid coolant of internal recycling.Therefore, in order to improve the life-span of product, the aluminium alloy brazing light wall pipe material of the intensity after soldering and excellent corrosion-proof performance is to guarantee the stable key of radiator performance.
Being generally used for automobile radiators tubing is to comprise the composite pipe of 3 layers, be namely that AA3003 alloy etc. is as core with Al-Mn, compound Al-Si is associated gold brazing filler metal in soldering side (atmosphere one side), in order to guarantee that aluminium soldering has inboard corrosion resistance preferably with matrix material, the compound Al-Zn of waterproof side (liquid contact side) is associated the sacrificial anode materials such as gold.Yet the intensity of Al-Zn alloy itself is very low, and the existence of this composite bed generally can reduce the intensity of material.After using the AA3003 alloy as this materials in the tube soldering of core, intensity is the 110MPa left and right, and intensity is lower.
In general, producing aluminium alloy brazing with in the process of matrix material, due to the ingot casting crop, hot rolling and cold-rolled products cut head and tail and trimming etc., can produce the waste material of 30% left and right.Wherein, the waste material of ingot casting is processed easily by remelting and is utilized, and the waste material of the crop end of hot rolling and cold-rolled products and trimming is difficult to re-use production aluminium soldering matrix material.These waste materials contain higher alloying element, and are as shown in the table, and especially the content of Si is very high.
The composition range of aluminium alloy scrap (% by weight)
| Si | Fe | Cu | Mn | Mg | Zr | Zn | Ti | Al |
| 0.8-2.3 | 0.1-0.5 | 0.08-0.7 | 0.7-1.5 | 0.05-0.4 | 0.01-0.12 | 0.05-0.3 | 0.03-0.12 | Surplus |
The people's such as D.Sampath WO 2007/131727A1 discloses the manufacture method that Al alloy composite is used in a kind of soldering, and the raw material that wherein is used for casting core alloy comprises the brazing sheet waste material of at least 25 % by weight.Although this has saved cost, usually can damage erosion resistance and understand the amplitude that increases strength fluctuation under the soldering postcondition.In the case, the people such as D.Sampath think the use of brazing sheet waste material with a small amount of of Cr but interpolation that have a mind to combines, and this has improved the physical strength of alloy under the soldering postcondition.The addition of Cr is preferably 0.05 to 0.20 % by weight, and the amount of having a mind to add Cr is at least 0.06 % by weight more preferably.
Chinese patent application CN 101886195A discloses a kind of high strength and high erosion-resisting long lifetime aluminium soldering tubing.In order to guarantee that this material has erosion resistance preferably after soldering, the general alloy that contains low Si and Fe that uses.So producing this composite pipe need to be with high-quality fine aluminium ingot as raw material, waste material is to forbid to use.Due to the waste material that can't consume the aluminium soldering matrix material, production cost is very high.
The purpose of this invention is to provide the soldering Al alloy composite that has high strength and good waterproof side (coolant side) and soldering side Corrosion Protection when the heating core body of the pipe of using as for example heat exchanger, tube sheet; The production of these materials in the tube simultaneously can consume more waste material, and the material cost of reduction and energy consumption are a kind of novel aluminum soldering matrix materials of reusable edible.
Summary of the invention
This purpose and advantage thereof have been realized by the present invention.
One aspect of the present invention relates to the core alloy that aluminium alloy compound tubing is used in soldering, and it consists of based on described core alloy:
0.15 to the Si of 1.2 % by weight,
0.5 to the Mn of 2.0 % by weight,
0.06 to the Fe of 0.60 % by weight,
0.1 to the Cu of 1.2 % by weight,
The Mg of＜0.25 % by weight,
The Zn of＜0.25 % by weight,
0.02 to the Ti of 0.3 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium, it is characterized in that, described core alloy is substantially free of Cr.
The present invention also relates to described soldering on the other hand with the manufacture method of the core alloy of aluminium alloy compound tubing, wherein based on the gross weight of raw material, uses the aluminium soldering alloyed scrap of at least 20 to 60 % by weight as raw material, and makes described core alloy by fusion casting.
Further aspect of the present invention also relates to soldering aluminium alloy compound tubing, and it is by core alloy, soldering side alloy and the waterproof side alloy composition of described soldering with aluminium alloy compound tubing, wherein
Based on described soldering side alloy, the consisting of of described soldering side alloy:
The Si of 5 to 12 % by weight,
The Mn of＜0.2 % by weight,
The Fe of＜0.5 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 3.0 % by weight,
The Ti of＜0.1 % by weight,
The Zr of＜0.1 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium;
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight,
The Mn of＜2.0 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
The present invention also relates to the manufacture method that waterproof side alloy in aluminium alloy compound tubing is used in soldering on the other hand, wherein based on the gross weight of raw material, use the aluminium soldering alloyed scrap of 20 to 60 % by weight, preferred 40 to 50 % by weight as raw material, and make described waterproof side alloy by fusion casting
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight, preferred＜1.0 % by weight,
The Mn of＜2.0 % by weight, preferred＜1.8 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight, preferred 1.0 to 4.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.The present invention also relates to the manufacture method that aluminium alloy compound tubing is used in described soldering at last, and it comprises the following steps:
1) make the core alloy according to the inventive method, described soldering side alloy is provided, and described waterproof side alloy is provided;
2) compound by rolling described core alloy, described soldering side alloy and the described waterproof side alloy of making.
Embodiment
One aspect of the present invention relates to the core alloy that aluminium alloy compound tubing is used in soldering, and it consists of based on described core alloy:
0.15 to the Si of 1.2 % by weight,
0.5 to the Mn of 2.0 % by weight,
0.06 to the Fe of 0.60 % by weight,
0.1 to the Cu of 1.2 % by weight,
The Mg of＜0.25 % by weight,
The Zn of＜0.25 % by weight,
0.02 to the Ti of 0.3 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium, it is characterized in that, described core alloy is substantially free of Cr.
In one embodiment of the invention, based on described core alloy, in described core alloy, Si content is 0.3 to 1.0 % by weight.
In one embodiment of the invention, based on described core alloy, in described core alloy, Mn content is 0.8 to 1.5 % by weight.
In one embodiment of the invention, based on described core alloy, in described core alloy, Fe content is 0.25 to 0.45 % by weight.
In one embodiment of the invention, based on described core alloy, in described core alloy, Cu content is 0.3 to 1.0 % by weight.
In one embodiment of the invention, based on described core alloy, in described core alloy, Zn content is＜0.10 % by weight.
In one embodiment of the invention, based on described core alloy, in described core alloy, Ti content is 0.1 to 0.2 % by weight.
In category of the present invention, described core alloy " is substantially free of Cr " and refers in the manufacturing processed of described core alloy, does not add wittingly Cr or contains the raw material of Cr, and Cr only might introduce as inevitable impurity.In the case, based on described core alloy, in described core alloy, Cr content is＜0.04 % by weight, is preferably＜0.03 % by weight more preferably＜0.02 % by weight.Described core alloy does not particularly preferably contain Cr fully.
The present invention also relates to described soldering on the other hand with the manufacture method of the core alloy of aluminium alloy compound tubing, wherein based on the gross weight of raw material, uses the aluminium soldering alloyed scrap of at least 20 to 60 % by weight as raw material, and makes described core alloy by fusion casting.
In one embodiment of the invention, described fusion casting is the semicontinuous ingot casting method of direct water-cooling, continuous casting method, thin ingot casting method or thin strip process.
In one embodiment of the invention, in described fusion casting, first with aluminium soldering alloyed scrap and the fusing of technical pure aluminium ingot, sampling analysis adds alloying element according to predetermined alloy composition, makes described core alloy by casting.
In one embodiment of the invention, the addition at the alloyed scrap of aluminium soldering described in fusion process is 40 to 50 % by weight of raw material gross weight.
Use waste material can reduce the addition of alloying element when founding, reduce the consumption of fine aluminium ingot, be significantly reduced to this.As cast the alloy of 20 tons, a stove, when the waste material addition is 50%, can save about 20% cost.
The interpolation of waste material is subject to the restriction of alloy component range.The aluminium soldering material is multilayer materials, having one deck at least is the Al-Si alloy, contain very high Si in waste material, high Si content can cause alloy melting point to reduce, and the aluminium soldering material generally need to carry out soldering at 600 ℃, so the alloy that 100% waste material is produced can not be used as the core of aluminium soldering material again.If as the aluminium soldering material, the addition of waste material is general unlikely surpasses 80%.
The present invention also relates to soldering aluminium alloy compound tubing on the other hand, and it is by core alloy, soldering side alloy and the waterproof side alloy composition of described soldering with aluminium alloy compound tubing, wherein
Based on described soldering side alloy, the consisting of of described soldering side alloy:
The Si of 5 to 12 % by weight,
The Mn of＜0.2 % by weight,
The Fe of＜0.5 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 3.0 % by weight,
The Ti of＜0.1 % by weight,
The Zr of＜0.1 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium;
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight,
The Mn of＜2.0 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
In one embodiment of the invention, based on described waterproof side alloy, in described waterproof side alloy, Si content is＜1.0 % by weight.
In one embodiment of the invention, based on described waterproof side alloy, in described waterproof side alloy, Mn content is＜1.8 % by weight.
In one embodiment of the invention, based on described waterproof side alloy, in described waterproof side alloy, Zn content is 1.0 to 4.0 % by weight.
The percentage ratio that the thickness of composite bed is accounted for the material total thickness is expressed as compound ratio.For example material thickness is 1mm, and composite bed thickness is 0.1mm, and compound ratio is 10%.
In one embodiment of the invention, based on the total thickness of described soldering with aluminium alloy compound tubing, the compound ratio of described soldering side alloy is 5 to 15%.
In one embodiment of the invention, based on the total thickness of described soldering with aluminium alloy compound tubing, the compound ratio of described waterproof side alloy is 5 to 15%.
In one embodiment of the invention, described soldering is not more than 0.3mm with the thickness of aluminium alloy compound tubing.
The present invention also relates to the manufacture method that waterproof side alloy in aluminium alloy compound tubing is used in soldering on the other hand, wherein based on the gross weight of raw material, use the aluminium soldering alloyed scrap of 20 to 60 % by weight, preferred 40 to 50 % by weight as raw material, and make described waterproof side alloy by fusion casting
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight, preferred＜1.0 % by weight,
The Mn of＜2.0 % by weight, preferred＜1.8 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight, preferred 1.0 to 4.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
The present invention also relates to the manufacture method that aluminium alloy compound tubing is used in described soldering at last, and it comprises the following steps:
1) make the core alloy according to the inventive method, described soldering side alloy is provided, and described waterproof side alloy is provided;
2) compound by rolling described core alloy, described soldering side alloy and the described waterproof side alloy of making.
In one embodiment of the invention, described soldering is with the step 2 of the manufacture method of aluminium alloy compound tubing) comprising: the optional homogenizing of implementing, mill face, compound, heating, hot rolling, cold rolling and annealing.At last, the thin plate with rolling acquisition is rolled into tubing.
Unless otherwise defined, all technology used herein and scientific terminology have the identical implication of usually understanding with those skilled in the art of the invention.If the contradiction of existence is as the criterion with the definition that the application provides.
Unless otherwise indicated, all per-cent, umber, ratio etc. all are by weight herein.
The material of this paper, method and embodiment are all exemplary, and unless stated otherwise, should not be construed as restrictive.
Below describe the method for producing the aluminium alloy brazing matrix material and the aluminium alloy brazing matrix material of producing according to described method in detail.
The composition of aluminium alloy brazing matrix material
1, core alloy
Consisting of of core alloy in the present invention:
0.15 to the Si of 1.2 % by weight,
0.5 to the Mn of 2.0 % by weight,
0.06 to the Fe of 0.60 % by weight,
0.1 to the Cu of 1.2 % by weight,
The Mg of＜0.25 % by weight,
The Zn of＜0.25 % by weight,
0.02 to the Ti of 0.3 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
The composition of 2, soldering side alloy
Consisting of of soldering side alloy aluminum ingot in the present invention:
The Si of 5 to 12 % by weight,
The Mn of＜0.2 % by weight,
The Fe of＜0.5 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 3.0 % by weight,
The Ti of＜0.1 % by weight,
The Zr of＜0.1 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
3, the composition of waterproof side alloy
Consisting of of waterproof side alloy in the present invention:
The Si of＜1.2 % by weight,
The Mn of＜2.0 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
Below interpolation reason and the interpolation scope of core, soldering side and waterproof side alloying element described.
1, core alloy
Si
In the present invention, Si is a very important element.Si forms the AlFeMnSi based compound together with Fe, Mn, play the effect of dispersion-strengthened, and perhaps solid solution improves intensity by solution strengthening in matrix.In addition, by forming Mg with the Mg reaction
2The Si compound can improve intensity.The content of Si is 0.15 to 1.2% scope, if lower than 0.15, its effect is little; When surpassing 1.2%, be solid-solubilized in the eutectic phase that can form low melting point in alloy, and significantly reduce the solidus temperature of core alloy.The reduction of core fusing point can make the possibility of melting uprise.Preferred Si content is 0.3 to 1.0%.The Si of high level shows in this material can add more alloyed scrap.
Mn
Mn has and improves intensity and solderability, solidity to corrosion, and the effect that improves current potential.The content of Mn is 0.3 to 1.8%.Lower than 0.3% the time, its effect is little, when surpassing 1.8%, easily forms huge intermetallic compound in castingprocesses, makes the plastic working reduction, and preferred Mn content is 0.8 to 1.5%, and this scope can guarantee that material has stable performance.The interpolation of alloyed scrap can change the composition of intermetallic compound, for the Mn of high-content, prevents that the formation of huge Mn-Fe intermetallic compound from being very important.So Mn content should not surpass 1.8%.
Mg
Mg significantly improves the intensity of alloy, has by separating out Mg
2Si puies forward high-intensity effect.The content of Mg is 0.01 to 0.5%.Lower than 0.1% the time, its strengthening effect is little; Higher than 0.5% the time, because be easy to react with the fluoride flux that uses, soldering has adverse influence to controlled atmosphere.Preferred Mg content is 0.1 to 0.35%.
Fe
Fe is ubiquitous impurity element in aluminium alloy.The content 0.1 to 0.8% of Fe can guarantee that material has better plasticity and corrodibility performance.In order to guarantee the intensity after the material soldering, suitable Fe minimum content is 0.2%; In order to guarantee not reduce corrosive nature and plasticity, the high-content of suitable Fe is 0.7%.In order to guarantee intensity and the good balance of corrosion resistance after soldering, and utilize waste material to produce not too difficulty of alloy, preferred Fe content is 0.2 to 0.6%.
Cu
Cu improves intensity as a component of strengthening or hardening by solution strengthening in aluminium alloy, in addition, can also improve current potential by solid solution, the potential difference of increase and sacrificial anode material, fin material improves the anticorrosion ability that is produced by the sacrificial anode effect.The content of Cu is 0.1 to 1.2% scope, if lower than 0.1%, its effect is little; When surpassing 1.2%, the possibility that intergranular corrosion occurs uprises with the hot tearing tendency change of industrial size ingot casting large.In order to guarantee intensity after higher soldering, corrosion resistance and braze ability, preferred Cu content is 0.3 to 1.0%.
Zn
The addition of Zn remains in 0.25%, to avoid too high uniform corrosion susceptibility.Preferred Zn content is not more than 0.10%, with the tendency of further reduction uniform corrosion.
Ti
Ti improves alloy strength by solution strengthening, puies forward corrosion resisting property after heavy alloyed soldering.Preferred Ti content is 0.02 to 0.3%.Lower than 0.02 o'clock, can not get its effect, when surpassing 0.3%, easily form huge intermetallic compound, make the plastic working reduction, Ti content preferred 0.1 to 0.2%.
Zr
Zr can reach 0.2% as the interpolation scope of alloying element, with the intensity of further raising alloy after soldering.And, the impact that this element can some impurity elements of balance.
2, waterproof side alloy
Zn
Current potential can be reduced, by forming the potential difference of sacrificial anode material and core, the solidity to corrosion that is produced by the sacrificial anode effect can be improved.The content of Zn is 0.5 to 5.0%, and lower than 0.5% the time, its effect is insufficient, and when surpassing 5.0%, corrosion speed accelerates, and sacrificial anode material just disappears in the early stage, and erosion resistance reduces.Preferred 1.0 to 4.0%.
Si
Form the Al-Fe-Mn-Si based compound together with Fe, Mn, play the effect of dispersion-strengthened, perhaps solid solution improves intensity by solution strengthening in matrix.Preferred content is below 1.2%.When surpassing 1.2%, the melting point depression of waterproof side alloy causes that the possibility of melting uprises.In addition, because the interpolation of Si can make the current potential of sacrificial anode material increase, therefore hinder the sacrificial anode effect, solidity to corrosion descends.Be more preferably below 1.0%.
Mn
Can improve intensity and the solidity to corrosion of alloy material.Preferred content is below 2.0%.When surpassing 2.0%, easily form huge intermetallic compound when casting, make the plastic working reduction.In addition, because the current potential of sacrificial anode material increases, therefore hinder the sacrificial anode effect, solidity to corrosion descends.Be more preferably below 1.8%.
As required, these Si, Mn can add at least a in sacrificial anode material.
3, soldering side alloy
Si
By add Si in soldering side alloy, reduce the fusing point of soldering side alloy, produce the liquid phase that contains Al-Si when making soldering, the surface bonding fin material forms joint outside.And, the volume of liquid phase when the addition of Si can affect soldering, in general, in 13%, Si content is higher, and during soldering, liquid phase volume is more, and volume is larger, more liquid can flow to the brazed joint place, the metallurgical binding effect of joint is improved, still, too much liquid phase can and materials in the tube core or fin carry out reaction between solid-liquid, and make core or fin partial melting, affect the performance of material.The content of Si is 5 to 12% scope, lower than 5% the time, can not produce enough liquid phases when content, can't form stable welding joint at the junction surface with naked fin material.Surpass 12% as content, liquid phase can with core or fin generation partial melting, cause material property to reduce.Further preferred content range is 6 to 10%.
Zn
In the present invention, be added with Si in soldering side alloy, Si improves current potential by solid solution.By adding Zn to soldering side alloy, the Zn when making soldering in soldering side alloy spreads in core, forms the gradient of Zn concentration at the plate thickness direction of core.Thus, the current potential of soldering side alloy is lower than the current potential of core, can work as sacrificial anode material, can suppress corrosion to the thickness of slab future development.The content of Zn is 0.5 to 3.0%, and lower than 0.5% the time, its effect is insufficient, and when surpassing 3.0%, corrosion speed accelerates, and after soldering, soldering side corrosion speed is too fast, causes corroding easy arrival core, and erosion resistance is reduced.More preferably 1.0 to 2.0%.
The manufacturing of aluminium alloy brazing matrix material
1, the melting of aluminum alloy materials and casting
(1) manufacturing of core alloy
make the core aluminium ingot by water-cooled semicontinuous casting (DC casting) method, it comprises the following steps: with the raw material melting, skim, sampling analysis, add after alloying element standing according to core alloy composition of the present invention, stir, refining, skim, pour standing furnace after adjusting component into, add the agent of titanium boron again to stir, refining, skim, through online rotten the processing, degasification, filter, enter casting machine and be cast as ingot casting, wherein said raw material fusion process comprises alloyed scrap and technical pure aluminium ingot is added the smelting furnace fusing, 730 to 760 ℃ of smelting temperatures, ingot casting is of a size of 330 * 1470mm.During melting, the addition of aluminium soldering waste material is at least 20 to 60 % by weight of raw material gross weight.
The manufacturing of (2) soldering side alloy
Make soldering side aluminium ingot by the water-cooled semi-continuous casting method, it comprises the following steps: the technical pure aluminium ingot is added the smelting furnace fusing, 730 to 760 ℃ of smelting temperatures, skim, sampling analysis, add standing after alloying element, stirring, refining, skim according to soldering side alloy composition of the present invention, pour standing furnace after adjusting component into, stirring, refining again, skim, enter casting machine and be cast as ingot casting, ingot casting size: 410 * 1450mm through online rotten processing, degasification, filtration.
(3) manufacturing of waterproof side alloy
According to waterproof side alloy composition of the present invention, with the manufacture method manufacturing described waterproof side alloy aluminum ingot same with the core alloy phase, wherein the addition of aluminium soldering waste material is at least 20 to 60 % by weight of raw material gross weight.
2, sawing
The bottom of the core alloy, soldering side alloy and the waterproof side alloy cast ingot that as above make is amputated 300 to 500mm.
3, optional homogenizing
The core alloy cast ingot was placed in the process furnace of 500 to 610 ℃ insulation 10 to 20 hours.
4, mill face
With each mill off 5 of two sides of the core alloy cast ingot after optionally homogenize to 20mm; With each mill off 5 of two sides of soldering side and waterproof side alloy cast ingot to 20mm.
5, preparation soldering side/waterproof side alloy composite plate
To mill in the process furnace that soldering side after face and waterproof side alloy cast ingot respectively be placed on 450 to 520 ℃ insulation 5 to 20 hours, and be rolled into the soldering side of specified dimension/waterproof side alloy composite plate on hot rolls.
6, compound
At the compound certain thickness soldering side alloy of a side of core, its compound ratio is 4 to 20%; At the compound certain thickness waterproof side alloy of the opposite side of core, its compound ratio is 5 to 25%; The thickness that described compound ratio is defined as composite bed accounts for the percentage ratio of soldering matrix material total thickness.
7, heating
The composite ingot of core and both sides composite bed is prepared hot rolling in heating between 400 to 520 ℃ after 1 to 25 hour.
8, hot rolling
This matrix material is hot-rolled down to 2 to 6mm from original depth, and curling rolling.
9, cold rolling
After cooling, hot rolled coil being rolled into thickness on cold-rolling mill is with interior cold rolling composite sheet material about 0.3mm.
10, finished products
Cold rolling composite sheet material is placed on carries out finished products in annealing furnace, 200 to 360 ℃ of annealing temperatures, annealing time 1 to 3 hour.Product after annealing namely can be used as aluminium alloy brazing matrix material of the present invention.
Therefore, also can provide a kind of aluminium alloy brazing sheet according to the present invention.This aluminium alloy brazing sheet is that wall is thin, after high soldering intensity and solderability excellent.And, because the wall of this brazing sheet is thin, therefore, when using heat exchanger as automobile, can lightweight, and also at atmospheric side, the solidity to corrosion of refrigerant side is well, can further extend the work-ing life of heat exchange.
In addition, the thickness of aluminium alloy brazing sheet of the present invention, the compound ratio of each layer are not particularly limited.Usually, when using as the tubing that makes water coolant or refrigerant circulation, can make the following thin-walled brazing sheet in 0.3mm left and right.
Embodiment
Following according to embodiment with more detailed description the present invention, but the invention is not restricted to this.
To have the core, soldering side alloy and the waterproof side alloy material that form shown in table 1,2,3 and prepare respectively the ingot casting of industrial size by DC castmethod as above, then ingot casting is milled face, by produce soldering side and the waterproof side composition board of specific thickness 500 ℃ of hot rollings.According to the alloy composition shown in table 4, core and soldering side, waterproof side alloy are carried out the hot rolling calendering compound under 500 ℃, make 3 layers of metal composite of 3.5mm.Then this metal composite is cold rolling, final thickness of slab is 0.25mm, then carries out the anneal of 2h and the air cooling of coming out of the stove at 260 ℃.Wherein the Comparative Examples B1 in table 1 is the AA3003 alloy, and this alloy has better plasticity and corrosion resistance nature and medium tenacity, and is better because of its over-all properties, is widely used as the core alloy of aluminium soldering material.
, the above-mentioned sheet material that makes as test materials, according to shown below method estimated, the results are shown in table 5 thereafter.
(1) soldering simulation
Approximately be warming up to 600 ℃ in 1 hour from the room temperature process, and be incubated 3 minutes, air cooling after cooling 10 minutes under nitrogen protection.
(2) sample preparation and strength test after soldering
According to the standby tension test sample of EN10002-1 standard system, gauge length is 50mm the test materials after above soldering simulation.Carry out stretching experiment in room temperature with 20mm/ minute draw speed.
(3) external corrosion property testing (SWAAT experiment)
With above-mentioned same soldering condition under make test materials after, waterproof side (sacrificial anode material) is sealed, press ASTM G85 (A3) and implement experiment, measure the time that material corrosion is bored a hole.
(4) internal corrosion (OY experiment)
With the soldering side seal, containing 195ppm Cl
-, 60ppm SO
4 2-, 1ppm Cu
2+, 30ppm Fe
3+88 ℃ of high-temperature water in placed 8 hours, then placed 16 hours in room temperature, to carry out the internal corrosion round-robin test, the test duration is 14 days.After experiment finishes, measure the degree of depth of 20 full depth corrosion holes, then get its mean value.
Table 1 core alloying constituent
Table 2 soldering side alloying constituent
Table 3 waterproof side alloying constituent
The composition of table 4 tubing
The performance of table 5 tubing
Can be clear and definite by table 5, even in the situation that containing element Cr not, more than the tensile strength after soldering was up to 160MPa, and the test materials 9 of Comparative Examples was only 116MPa as the test materials 1,3,5 and 7 of the embodiment of the present invention.The corrosion resistance nature of soldering side in addition, (air side that is equivalent to heat exchanger), waterproof side (being equivalent to refrigerant side) is all good.
Embodiment compares with the test result of Comparative Examples, the tensile strength of alloy material of the present invention and outer corrosive nature obviously are better than Comparative Examples, internal corrosion can reach par, although the unit elongation of alloy material of the present invention is lower than Comparative Examples, but those skilled in the art should understand that in range of application of the present invention, general unit elongation reaches 10% demand that can satisfy in the product preparation.
Aluminium alloy brazing matrix material of the present invention reduces the consumption of fine aluminium ingot owing to using when the founding aluminium alloy scrap can reduce the addition of alloying element, obviously reduces production costs.For example, the alloy that casting one stove is 20 tons when the addition of aluminium alloy scrap is 50%, can be saved about 20% production cost.In addition, when the aluminium alloy brazing matrix material that the present invention produces uses as the tubing that makes water coolant or refrigerant circulation, can make the following thin-walled brazing sheet in about 0.3mm, and have high-intensity character after soldering, keep simultaneously the corrosion resistant performance of good soldering side and waterproof side.
Claims (22)
1. soldering is with the core alloy of aluminium alloy compound tubing, and it consists of based on described core alloy:
0.15 to the Si of 1.2 % by weight,
0.5 to the Mn of 2.0 % by weight,
0.06 to the Fe of 0.60 % by weight,
0.1 to the Cu of 1.2 % by weight,
The Mg of＜0.25 % by weight,
The Zn of＜0.25 % by weight,
0.02 to the Ti of 0.3 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium, it is characterized in that, described core alloy is substantially free of Cr.
2. core alloy according to claim 1, wherein based on described core alloy, Cr content is＜0.04 % by weight.
3. core alloy according to claim 1 and 2, wherein based on described core alloy, Si content is 0.3 to 1.0 % by weight.
One of according to claim 1 to 3 described core alloy, wherein based on described core alloy, Mn content is 0.8 to 1.5 % by weight.
One of according to claim 1 to 4 described core alloy, wherein based on described core alloy, Fe content is 0.25 to 0.45 % by weight.
One of according to claim 1 to 5 described core alloy, wherein based on described core alloy, Cu content is 0.3 to 1.0 % by weight.
One of according to claim 1 to 6 described core alloy, wherein based on described core alloy, Zn content is＜0.10 % by weight.
One of according to claim 1 to 7 described core alloy, wherein based on described core alloy, Ti content is 0.1 to 0.2 % by weight.
One of according to claim 1 to 8 described core alloy manufacture method, wherein based on the gross weight of raw material, use the aluminium soldering alloyed scrap of at least 20 to 60 % by weight as raw material, and make described core alloy by fusion casting.
10. method according to claim 9, is characterized in that, the addition of described aluminium soldering alloyed scrap is 40 to 50 % by weight of raw material gross weight.
11. according to claim 9 or 10 described methods is characterized in that, described fusion casting is the semicontinuous ingot casting method of direct water-cooling, continuous casting method, thin ingot casting method or thin strip process.
12. one of according to claim 9 to 11 described method, it is characterized in that, in described fusion casting, first with aluminium soldering alloyed scrap and the fusing of technical pure aluminium ingot, sampling analysis adds alloying element according to predetermined alloy composition, makes described core alloy by casting.
13. soldering aluminium alloy compound tubing, it is by one of according to claim 1 to 8 described core alloy, soldering side alloy and waterproof side alloy composition, wherein
Based on described soldering side alloy, the consisting of of described soldering side alloy:
The Si of 5 to 12 % by weight,
The Mn of＜0.2 % by weight,
The Fe of＜0.5 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 3.0 % by weight,
The Ti of＜0.1 % by weight,
The Zr of＜0.1 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium;
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight,
The Mn of＜2.0 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
14. soldering according to claim 13 aluminium alloy compound tubing, wherein based on described waterproof side alloy, in described waterproof side alloy, Si content is＜1.0 % by weight.
15. according to claim 13 or 14 described soldering aluminium alloy compound tubing, wherein based on described waterproof side alloy, in described waterproof side alloy, Mn content is＜1.8 % by weight.
16. according to claim 13 to one of 15 described soldering aluminium alloy compound tubing, wherein based on described waterproof side alloy, in described waterproof side alloy, Zn content is 1.0 to 4.0 % by weight.
17. the soldering aluminium alloy compound tubing according to claim 13 to one of 16 is characterized in that, based on the total thickness of described soldering with aluminium alloy compound tubing, the compound ratio of described soldering side alloy is 5 to 15%.
18. the soldering aluminium alloy compound tubing according to claim 13 to one of 17 is characterized in that, based on the total thickness of described soldering with aluminium alloy compound tubing, the compound ratio of described waterproof side alloy is 5 to 15%.
19. the soldering aluminium alloy compound tubing according to claim 13 to one of 18 is characterized in that described soldering is not more than 0.3mm with the thickness of aluminium alloy compound tubing.
20. soldering, is used the aluminium soldering alloyed scrap of at least 20 to 60 % by weight as raw material, and is made described waterproof side alloy by fusion casting wherein based on the gross weight of raw material with the manufacture method of waterproof side alloy in aluminium alloy compound tubing,
Based on described waterproof side alloy, the consisting of of described waterproof side alloy:
The Si of＜1.2 % by weight, preferred＜1.0 % by weight,
The Mn of＜2.0 % by weight, preferred＜1.8 % by weight,
The Fe of＜0.50 % by weight,
The Cu of＜0.2 % by weight,
The Mg of＜0.25 % by weight,
0.5 to the Zn of 5.0 % by weight, preferred 1.0 to 4.0 % by weight,
The Ti of＜0.2 % by weight,
The Zr of＜0.2 % by weight,
Single other elements of planting content≤0.05 % by weight and total content≤0.15 % by weight,
Surplus is aluminium.
21. method according to claim 20 is characterized in that, the addition of described aluminium soldering alloyed scrap is 40 to 50 % by weight of raw material gross weight.
22. the soldering according to claim 13 to one of 19 is with the manufacture method of aluminium alloy compound tubing, it comprises the following steps:
1) described method manufacturing of one of according to claim 9 to 12 core alloy, provide described soldering side alloy, and described waterproof side alloy be provided;
2) compound by rolling described core alloy, described soldering side alloy and the described waterproof side alloy of making.
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| CN112746199A (en) * | 2020-12-16 | 2021-05-04 | 银邦金属复合材料股份有限公司 | Aluminum alloy for shutter and preparation method thereof |
| CN112746199B (en) * | 2020-12-16 | 2022-05-31 | 银邦金属复合材料股份有限公司 | Aluminum alloy for shutter and preparation method thereof |
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