CN102345032A - Copper alloy material of heat exchanger copper pipe - Google Patents
Copper alloy material of heat exchanger copper pipe Download PDFInfo
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- CN102345032A CN102345032A CN201110174836XA CN201110174836A CN102345032A CN 102345032 A CN102345032 A CN 102345032A CN 201110174836X A CN201110174836X A CN 201110174836XA CN 201110174836 A CN201110174836 A CN 201110174836A CN 102345032 A CN102345032 A CN 102345032A
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Abstract
The invention relates to a copper alloy material of a heat exchanger copper pipe. The copper alloy material of a heat exchanger copper pipe comprises: by weight, 0.5 to 1.2% of Sn, 0.05 to 0.20% of P, 0.5 to 1.8% of Mn, 1.2 to 5.0% of Ni, 0.5 to 1.2% of Co, 0.10 to 0.20% of Sb and the balance Cu and unavoidable impurities. The copper alloy material of a heat exchanger copper pipe has good heat resistance. When being heating to a high temperature of 750 DEG C, a heat exchanger copper pipe prepared from the copper alloy material still has excellent strength properties. The copper alloy material of a heat exchanger copper pipe has excellent processing performances and specially, has excellent cold processing performances.
Description
Technical field
The present invention relates to a kind of Cu alloy material, the present invention relates to a kind of Cu alloy material that is suitable for heat-exchanger brass pipe specifically, it has excellent erosion resistance, and its processability is good.
Background technology
Being generally used for fin tube heat exchanger is the U font copper pipe (perhaps copper alloy tube) that bending machining is become the hair(-)pin shape; The communicating pores of the radiator element that constitutes by the aluminum or aluminum alloy plate; Expanding tool inserted in the copper pipe said copper pipe is carried out expander; Copper pipe and aluminium radiator fin are connected airtight; In addition; Expander is carried out in open end to copper pipe; Become the crooked copper pipe of U font to insert this expander open end bending machining; Crooked copper pipe is brazed in the expander open end of U font copper pipe with solders such as phosphor-coppers; Thus; Connect a plurality of U font copper pipes through crooked copper pipe, make heat exchanger.
For this reason, the copper pipe that is used for heat exchanger requires thermal conductivity, bendability and solderability good.Therefore, these characteristics are good, and the deoxidized copper with suitable intensity is widely used.
At present; U font bending machining and expander be used for the heat-transfer pipe of aforementioned fin tube heat exchanger because will be carried out; Therefore the soft material through adopting the annealing material or the annealing material having been carried out the light processing of drawing etc.; It has sufficient deformability in the face of these processing, and can process with very little power.Under the situation of phosphorized copper system heat-transfer pipe,,, need the wall thickness of extra strong pipe therefore for the increase of the running pressure of corresponding refrigeration agent because tensile strength is little.In addition; When the assembling of heat exchanger; Brazing portion is heated the several seconds to tens of seconds in the temperature more than 800 ℃; Therefore brazing portion and near compare thickization of crystal grain with other parts; Owing to the softening state that becomes the intensity reduction; Therefore reduce in order to remedy the intensity that causes because of brazing, need further thicken wall thickness.So, as passing pipe heat if use phosphorized copper, then the quality of heat exchanger increases, and price rises, and therefore a kind of tensile strength of just strong expectation is high, excellent in workability, the heat-transfer pipe with good thermal conductivity.For even the wall thickness attenuation of the phosphorous deoxidize copper tube that is used in fin tube heat exchanger still can tolerate practicality; Plastic working through the phosphorous deoxidize copper tube after the annealing being carried out drawing processing etc. gets final product to improve its tensile strength; But because plastic working causes ductility to reduce, thereby can not carry out bending machining.
In order to adapt to such requirement; As 0.2% yield-point and the excellent copper alloy tube of fatigue strength; For example propose to have a kind of heat exchanger non junction copper alloy tube; It contains Co:0.02～0.2 quality %, P:0.01～0.05 quality %, C:1～20ppm; Surplus is made up of Cu and unavoidable impurities, and the oxygen of impurity is below the 50ppm.In addition; A kind of copper alloy tube for heat exchanger is also proposed; It has following composition: contain below Sn:0.1～1.0 quality %, P:0.005～0.1 quality %, the O:0.005 quality % and below the H:0.0002 quality %; Surplus is made up of Cu and unavoidable impurities, and average crystal grain diameter is below the 30 μ m.Yet, though separate out intensity and tensile strength improved by what the phosphide of Co brought, not rising of withstand voltage strength at break in the ratio that intensity rises.In addition, the brazing heating when making owing to heat exchanger, said phosphide solid solution, the intensity of heat-transfer pipe reduces near brazing portion.Therefore, when it was used for heat-transfer pipe, existing not too can the attenuate wall thickness, thereby can not get the problem points of desired effects.
In addition; Intensity improves through the solid solution strength of Sn; Be used for heat-transfer pipe with the wall thickness attenuation that can make pipe; But when carrying out U word bending machining in order to become heat exchanger; Then distinguish and have following problem points: at bend gauffer or crackle take place easily, this part becomes starting point and is not reaching under the very low intensity of expection and will destroyed.
Summary of the invention
Above-mentioned purpose in view of the copper alloy heat exchanger materials existence of using in the prior art; The Cu alloy material that the purpose of this invention is to provide a kind of heat-exchanger brass pipe; It brings up to tensile strength can not make the bendability deterioration more than the demand, bendability and solidity to corrosion are also excellent in addition.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of Cu alloy material of heat-exchanger brass pipe; It has following composition: Sn:0.5-1.2 wt%, P:0.05-0.20 wt%, Mn:0.5-1.8 wt%, Ni:1.2-5.0 wt%, Co:0.5-1.2 wt%; Sb:0.10-0.20 wt%, surplus is that Cu and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying constituent of Cu alloy material of the present invention are described below.
Sn：
In Cu alloy material of the present invention, Sn has tensile strength, unit elongation and the thermotolerance of raising, suppresses the effect of thickization of crystal grain.When the content of Sn surpasses 1.2 wt%, the conduction of Cu alloy material, thermal conductivity will significantly reduce; When the content of Sn was lower than 0.50 wt%, Cu alloy material of the present invention can not obtain sufficient tensile strength and trickle crystal grain diameter after annealing and brazing heating.In the application's Cu alloy material, the content of Sn further is preferably: 0.75-1.05 wt%.
P：
Through in Cu alloy material, adding P, be used to prevent the oxidation of Sn, in alloy of the present invention,, then, hot pressing is prone to crack when going out if P content surpasses 0.20 wt%, and stress corrosion cracking susceptibility uprises.If P content is lower than 0.05 wt%, then because the deoxidation deficiency causes the oxygen amount to increase, will the oxidation of Sn take place inevitably, as the bendability reduction of Cu alloy material.Preferably, the content of P wherein is 0.05-0.10 wt%.
：
Through in copper alloy, adding Mn, can the refinement aluminum alloy granule, improve the intensity of alloy and don't reduce the solidity to corrosion of alloy.When the content of Mn was lower than 0.5 wt%, its raising to copper alloy intensity was not remarkable; And when the content of Mn was higher than 1.8wt%, its solubleness in alloy reached capacity, and continued to increase the content of Mn, will cause in hot worked process, reducing the processing characteristics of extruding of alloy.Thereby, in the present invention its content is limited in the scope of 0.5wt%-1.8 wt%.Preferably, the content range of Mn is: 0.8-1.5 wt%.
Ni：
Through in Cu alloy material, adding Ni, can crystal grain thinning, improve the intensity of copper alloy, the anti-pulsating stress that particularly can improve copper alloy is tired, but also can improve the resistance to elevated temperatures of alloy, for example high-temperature corrosion resistance performance.If yet the content of Ni surpasses 5.0 wt%, the mobile variation of material, the processability of material is variation also.When if the content of Ni is lower than 1.2 wt%, the interpolation of Ni is limited to the raising degree of alloy strength, corrosion resisting property.The preferred content of Ni is 1.5-4.2 wt%.Preferred, its content range is 2.0-4.5 wt%.
Co：
Through in Cu alloy material, adding a spot of Co, the effect of the intensity that can be improved, and can improve the high-temperature corrosion resistance performance of alloy, the Mn in alloy can work in coordination with the corrosion resisting property of improving material.If content surpasses 1.2 wt%, will significantly reduce brazing property, and addition is not remarkable to the corrosion proof raising of Cu alloy material during less than 0.5 wt%.The preferred content of Co is 0.5-1.0 wt%.
Sb：
In copper alloy, adding an amount of Sb helps crystal grain thinning and increases substantially corrosion resistance of alloy.The content range of Sb is in copper alloy of the present invention: 0.1-0.2wt%.When the content of Sb the time greater than 0.2 wt%, will reduce the hot workability of copper alloy, because of rather than preferably.And when the content of Sb is lower than 0.1 wt%, be not remarkable especially to the corrosion proof raising of alloy.
In addition; The invention also discloses the preparation method of the Cu alloy material of above-mentioned heat-exchanger brass pipe; It is characterized in that, will under nitrogen protection atmosphere, be heated to 1150-1250 ℃ of insulation 80-200 min by the alloy raw material of Sn, P, Mn, Ni, Co, Sb and the Cu of above-mentioned weight percent proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.3-0.8 wt%
2, stir 30-75 min; Afterwards with alloy liquid at 1150-1280 ℃ of casting; Then in 720-820 ℃ of insulation 2-8 h processings that homogenize, cool off and obtain described Cu alloy material.Described Cu alloy material is through cold working and/or hot-work and/or casting, and prior aries such as for example forging, hot pressing, clod wash processing are processed into the copper alloy heat-exchanger brass pipe.
Cu alloy material of the present invention behind homogenizing annealing, is observed its metallographic structure, and crystal grain is tiny and evenly beneficial to the solidity to corrosion that improves copper alloy; And do not find to exist in a large number the heterogeneous phase of galvanic corrosion in its tissue, alleviated the tendency that intergranular corrosion takes place greatly, the probability that spot corrosion takes place is also very little; And the intensity of material compares with common copper alloy significant raising also arranged, and its intensity is usually greater than 350 MPa, and preferably its intensity is higher than 450 MPa; In addition, Cu alloy material resistance toheat of the present invention is good, and the copper alloy heat-exchanger brass pipe of preparation is heated to 750 ℃ high temperature, and it still can keep excellent strength property; And its processing characteristics, particularly excellent cold-workability exhibiting.
Embodiment
Following the present invention will combine concrete embodiment that the present invention is done further explanation and explanation.
Press the shown mass percent of table 1, prepare Cu alloy material of the present invention.Concrete preparation process is: will under nitrogen protection atmosphere, be heated to 1200 ℃ of insulation 175 min by the alloy raw material of Sn, P, Mn, Ni, Co, Sb and the Cu of above-mentioned weight percent proportioning; Add the BaCl that accounts for alloy raw material gross weight 0.4 wt%
2, stir 45 min; Afterwards with alloy liquid at 1250 ℃ of casting; Then in 780 ℃ of insulation 4 h processings that homogenize, cool off and obtain described Cu alloy material.The chemical ingredients of table 1 mother metal (surplus is Cu and unavoidable impurities)
| Numbering | Sn | P | Ni | Mn | Co | Sb |
| 1 | 0.5 | 0.50 | 1.2 | 0.5 | 0.5 | 0.10 |
| 2 | 0.75 | 0.05 | 1.8 | 0.8 | 0.7 | 0.10 |
| 3 | 0.85 | 0.10 | 2.4 | 1.1 | 0.9 | 0.15 |
| 4 | 0.95 | 0.10 | 3.0 | 1.2 | 1.0 | 0.15 |
| 5 | 1.05 | 0.15 | 3.8 | 1.5 | 1.1 | 0.20 |
| 6 | 1.2 | 0.20 | 5.0 | 1.8 | 1.2 | 0.20 |
Strength of materials test
In order to measure tensile strength, the materials processing that will pass through at normal temperatures after the cold working becomes standardized component, carries out the standard tensile test, the tensile strength of test material.Person between the tensile strength 350 MPa-450 MPa is evaluated as very, is lower than 350 MPa persons and is evaluated as poorly, it is excellent to surpass being evaluated as of 450 MPa.
The material corrosion resistance test
Size with 50 * 50 mm cuts out sample respectively, carries out salt-fog test.The corrosion test time set is 1000 hours, material surface do not have the degree of depth surpass 0.1 mm corrosion pit, be evaluated as very, it is poor to have the sample of the corrosion pit that surpasses 0.1 mm to be evaluated as corrodibility, no corrosion pit, be evaluated as excellent.Test result is presented in the table 2.
Table 2: sample tensile strength and salt-fog test result
| Specimen coding | Tensile strength | SWAAT test 1000 hours |
| 1 | Very | Very |
| 2 | Very | Very |
| 3 | Very | Excellent |
| 4 | Excellent | Excellent |
| 5 | Excellent | Excellent |
| 6 | Excellent | Very |
Claims (8)
1. the Cu alloy material of a heat-exchanger brass pipe; It has following composition: Sn:0.5-1.2 wt%, P:0.05-0.20 wt%, Mn:0.5-1.8 wt%, Ni:1.2-5.0 wt%, Co:0.5-1.2 wt%; Sb:0.10-0.20 wt%, surplus is that Cu and unavoidable impurities constitute.
2. the described Cu alloy material of claim 1 is characterized in that the content of described Sn is: 0.75-1.05 wt%.
3. the described Cu alloy material of claim 1 is characterized in that the content of described P is: 0.05-0.10 wt%.
4. the described Cu alloy material of claim 1 is characterized in that the content of described Mn is: 0.8-1.5 wt%.
5. the described Cu alloy material of claim 1 is characterized in that the content of described Ni is: 1.5-4.2 wt%.
6. the described Cu alloy material of claim 1 is characterized in that the content of described Ni is: 2.0-4.5 wt%.
7. the described Cu alloy material of claim 1, the content that it is characterized in that described Co is 0.5-1.0 wt%.
8. radiator fin is characterized in that being processed by said each the Cu alloy material of claim 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110174836XA CN102345032A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material of heat exchanger copper pipe |
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| CN201110174836XA CN102345032A (en) | 2011-06-27 | 2011-06-27 | Copper alloy material of heat exchanger copper pipe |
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| CN102345032A true CN102345032A (en) | 2012-02-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110546286A (en) * | 2017-04-27 | 2019-12-06 | 丰川控股有限公司 | Copper pipe with excellent ant nest-like corrosion resistance |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827811A (en) * | 2006-03-28 | 2006-09-06 | 江阴新华宏铜业有限公司 | Seamless copper alloy pipe with excellent anti-corrosion performance for heat exchanger and preparation method thereof |
| CN101078069A (en) * | 2007-06-25 | 2007-11-28 | 云南新铜人实业有限公司 | Copper-base alloy for heat exchanger |
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2011
- 2011-06-27 CN CN201110174836XA patent/CN102345032A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1827811A (en) * | 2006-03-28 | 2006-09-06 | 江阴新华宏铜业有限公司 | Seamless copper alloy pipe with excellent anti-corrosion performance for heat exchanger and preparation method thereof |
| CN101078069A (en) * | 2007-06-25 | 2007-11-28 | 云南新铜人实业有限公司 | Copper-base alloy for heat exchanger |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110546286A (en) * | 2017-04-27 | 2019-12-06 | 丰川控股有限公司 | Copper pipe with excellent ant nest-like corrosion resistance |
| CN110546286B (en) * | 2017-04-27 | 2021-10-08 | Njt铜管株式会社 | Copper pipe with excellent ant nest-like corrosion resistance |
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Application publication date: 20120208 |