CN1420199A - Method for preparing incomplete recrystallized copper pipe - Google Patents
Method for preparing incomplete recrystallized copper pipe Download PDFInfo
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- CN1420199A CN1420199A CN 01132254 CN01132254A CN1420199A CN 1420199 A CN1420199 A CN 1420199A CN 01132254 CN01132254 CN 01132254 CN 01132254 A CN01132254 A CN 01132254A CN 1420199 A CN1420199 A CN 1420199A
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- copper pipe
- gas
- flue
- annealing
- copper
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Abstract
An incomplete recrystallizing process for preparing copper tuber used in domestic air conditioner and refrigerator is characterized by that after a copper tube is greatly deformed, its surficial crystal grain shape is fully lost and the crystal interface and slip band can not be distinguished, basically forming the fibrous structure. After partial recrystallizing and annealing, it has the balanced hardness and softness, uniform hardness and high surface brightness.
Description
Technical field
The present invention relates to the copper pipe working method, be specifically related to a kind of preparation method of incomplete recrystallized copper pipe.
Background technology
Copper tube is a kind of purposes nonferrous materials very widely, recent two decades, and the development of world's refrigeration industry is rapidly, particularly in recent years, along with the continuous application of floride-free electric refrigerator, adopt energy-efficient copper pipe to become inexorable trend, industry consumption such as building also increased year by year in recent years.Metallurgical industry press of country publish " heavy non-ferrous metal materials processing handbook has been carried out detailed argumentation to the complete processing of copper pipe (comprising red copper, brass, bronze etc.).Its obviously do not feel well in to the introduction of copper tube should before development.
At present, copper tube is according to different Application Areass, and the user selects different performance state, and copper tube mainly can be divided into flexible pipe, semihard pipe and hard tube.Hard tube obtains after generally adopting moderate finite deformation, and hardness is higher, and the consumption of this state copper pipe is few at present.Flexible pipe is to obtain after the copper hard tube is annealed, and crystal grain all is recrystallize, copper pipe appearance light, and hardness is even, and resid amount is low, and product is mainly used in domestic air conditioning and refrigerator.Another kind is the semihard pipe, and traditional manufacture method is that flexible pipe is carried out a certain amount of distortion, reaches desired hardness.Because copper pipe is wanted oil addition when distortion, so the surfaces externally and internally of semihard pipe is not bright and clean, obfuscation, resid amount exceeds standard.In order to eliminate oil stain, adopt acid wash passivation to handle or the cleaning of employing trieline, this method has following shortcoming:
(1), the bulk life time of copper pipe reduces greatly behind the acid wash passivation, because of acid solution corrodes grain surface.(this problem has obtained demonstration in recent years American-European scientist's test).Progressively be eliminated in recent years.
(2), it is poor that trieline cleans back copper tube bright skin.Can't obtain the copper primary colors surface of light.Seriously polluted because of trieline, do not re-use in some relatively advanced areas.
(3), adopt acid wash passivation and cleaning, complex procedures on the one hand, cost is higher, environmental protection investments are big.The copper processing industry itself belongs to the meagre profit industry of high investment, low output, and the increase beginning of cost must influence the business economic benefit.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of preparation method of incomplete recrystallized copper pipe, and to overcome the complex procedures that prior art exists, cost is higher, the defective that environmental protection investments are big.
It is 245N/mm that term " incomplete recrystallized copper pipe " refers to tensile strength
2～330N/mm
2The semihard pipe.
Technical conceive of the present invention is such:
Copper pipe is by the grain shape completely dissolve of gross distortion processing rear surface, crystal boundary and slip band can't be distinguished, basically formed fibrous tissue along machine direction, the starting temperature of the copper pipe recrystallize of this aximal deformation value is lower, hard tube is carried out the method for annealing of partial crystallization, by the grain of the copper pipe product after annealing part is recrystallize, the soft or hard degree of copper pipe integral body is more even, and according to this method can carry out that semihard is soft partially, the annealing of semihard, the inclined to one side hard tube of semihard, and can reach separately requirement.Copper pipe surface luminance brightness after the annealing is identical with flexible pipe, has saved passivation or matting, thereby has overcome the existing in prior technology defective.
Method of the present invention comprises the steps:
(1) will be by the copper pipe after the gross distortion processing, promptly hard tube places the annealing furnace flue, vacuumizes, and the pressure in the flue is lower than-0.08MPa;
(2) with the flue heating, charge into rare gas element simultaneously, to prevent the copper pipe oxidation, aeration quantity is 0.06～0.30m
3/ min when the pressure in temperature in the flue reaches 150～250 ℃, flue reaches 0.2～0.6MPa, opens the purging valve exhaust.
(3) when temperature in the flue reaches 310～390 ℃, begin insulation, be incubated 1～3 hour, should charge into the mixture of rare gas element and reducing gas during insulation, two kinds of gases can mix and charge into, also sectional charges into, general reducing gas accounts for 5～20% of total gas couette, after annealing finishes, pulls out flue and cools off with air-cooled or water-cooled, when temperature in the flue drops to below 50 ℃, come out of the stove, promptly obtain incomplete recrystallized copper pipe of the present invention.
Said rare gas element comprises a kind of and composition thereof in nitrogen, argon gas or the carbonic acid gas, but preferred nitrogen;
Said reducing gas is hydrogen or carbon monoxide, preferably hydrogen.
According to the present invention, will be by the copper pipe after the gross distortion processing, i.e. the saw kerf of hard tube leveling, port falls burr, removes the endoporus sawdust, and with clean-out system copper pipe is carried out inside and outside wall and clean, drying, and then anneal.
The incomplete recrystallized copper pipe that is obtained according to the method described above, tensile strength is 245N/mm
2～340N/mm
2, crystal grain is recrystallize partly, has copper primary colors light appearance surface, and hardness is even, and resid amount is low, can be applicable to domestic air conditioning and refrigerator field, and non-environmental-pollution.
Embodiment
Embodiment 1
Copper pipe specification: φ 19 * 0.8
Mechanical property: tensile strength: 290N/mm
2～320N/mm
2, extend: 15;
The trade mark: TP
2(phosphorized copper)
The horizontal annealing electric furnace of annealing furnace: 260kw;
Shielding gas: nitrogen and hydrogen.
Working method is as follows:
Burr is fallen in 1 copper pipe saw kerf leveling, port, removes the endoporus sawdust, with clean-out system copper pipe is carried out inside and outside wall and cleans, and dries the annealing furnace flue of packing into dried cloth.
2 pairs of flues vacuumize, reach-during 0.08Mpa, flue is sent into the annealing electric furnace and is heated, and inflated with nitrogen is as shielding gas simultaneously, and the aeration quantity of nitrogen is 0.08m
3/ min.Temperature reaches 200 ℃ in flue, and open purging valve and begin venting,
3 when temperature in the flue reaches 350 ℃; annealing furnace begins insulation; use nitrogen and hydrogen during insulation instead and make protection gas; hydrogen content is 15%; total annealing time is 2 hours, and annealing finishes, and pulls out the air-cooled cooling of flue; come out of the stove when temperature in the flue drops to below 50 ℃, be incomplete recrystallized copper pipe of the present invention.
When coming out of the stove, for safety, the reply flue vacuumizes, and eliminates residual hydrogen.
Claims (5)
1. the preparation method of an incomplete recrystallized copper pipe is characterized in that, this method comprises the steps:
(1) will place the annealing furnace flue by the copper pipe after the gross distortion processing, vacuumize, the pressure in the stove is lower than-0.08MPa;
(2) with the flue heating, charge into rare gas element simultaneously, aeration quantity is 0.06～0.3m
3/ min when the pressure in temperature in the flue reaches 150～250 ℃, flue reaches 0.2～0.6MPa, opens the purging valve exhaust;
(3) when temperature in the flue reaches 310～390 ℃, be incubated 1～3 hour, should charge into the mixture of rare gas element and reducing gas during insulation, two kinds of gas can mix and charges into or segmentation charges into, reducing gas accounts for 5～20% of total gas couette, and annealing promptly obtains incomplete recrystallized copper pipe after finishing;
Said reducing gas is hydrogen or carbon monoxide.
2. the method for claim 1 is characterized in that, said rare gas element comprises a kind of and composition thereof in nitrogen, argon gas or the carbonic acid gas.
3. method as claimed in claim 2 is characterized in that, said rare gas element is a nitrogen.
4. the method for claim 1 is characterized in that, reducing gas is a hydrogen.
5. as the arbitrary described method of claim 1～4, it is characterized in that, will be by the saw kerf leveling of the copper pipe after the gross distortion processing, port falls burr, removes the endoporus sawdust, and with clean-out system copper pipe is carried out inside and outside wall and clean, drying, and then anneal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132254 CN1420199A (en) | 2001-11-21 | 2001-11-21 | Method for preparing incomplete recrystallized copper pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01132254 CN1420199A (en) | 2001-11-21 | 2001-11-21 | Method for preparing incomplete recrystallized copper pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1420199A true CN1420199A (en) | 2003-05-28 |
Family
ID=4671291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01132254 Pending CN1420199A (en) | 2001-11-21 | 2001-11-21 | Method for preparing incomplete recrystallized copper pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1420199A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941241A (en) * | 2012-10-17 | 2013-02-27 | 青岛宏奥铜管有限公司 | Processing method used for Y2 state copper pipe |
| CN114293004A (en) * | 2021-12-15 | 2022-04-08 | 江苏隆达超合金股份有限公司 | Heat treatment process of seamless copper alloy sheath coil pipe for railway through ground wire |
-
2001
- 2001-11-21 CN CN 01132254 patent/CN1420199A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102941241A (en) * | 2012-10-17 | 2013-02-27 | 青岛宏奥铜管有限公司 | Processing method used for Y2 state copper pipe |
| CN114293004A (en) * | 2021-12-15 | 2022-04-08 | 江苏隆达超合金股份有限公司 | Heat treatment process of seamless copper alloy sheath coil pipe for railway through ground wire |
| CN114293004B (en) * | 2021-12-15 | 2023-09-05 | 江苏隆达超合金股份有限公司 | Heat treatment process of seamless copper alloy sheath coil pipe for railway through ground wire |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |