CN102260837A - Protective atmosphere switching method for red copper and brass strips - Google Patents
Protective atmosphere switching method for red copper and brass strips Download PDFInfo
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- CN102260837A CN102260837A CN 201110189025 CN201110189025A CN102260837A CN 102260837 A CN102260837 A CN 102260837A CN 201110189025 CN201110189025 CN 201110189025 CN 201110189025 A CN201110189025 A CN 201110189025A CN 102260837 A CN102260837 A CN 102260837A
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Abstract
The invention discloses a protective atmosphere switching method for red copper and brass strips. The method comprises the following steps of: pulling out red copper from a heating furnace, directly closing the protective atmosphere of the red copper, opening a furnace door, and putting brass into the heating furnace, wherein air is used as the protective atmosphere for annealing and heating the brass. Compared with the prior art, the method has the characteristics that: 1, the mixed air of hydrogen and nitrogen is used as the protective atmosphere for annealing and heating the red copper strips, so product quality during annealing and heating of the red copper strips is ensured; 2, the air or the air containing argon is directly used as the annealing and heating atmosphere for annealing the brass strips, so pollution of zinc steam volatilized by the brass in the annealing process to the working environment in an air cushion furnace is reduced and atmosphere consumption is reduced; and 3, by adopting the atmosphere switching method, nitrogen consumption required for internal blowing by adopting pure nitrogen is avoided, the waiting time is reduced, and the product cost and the energy consumption are reduced.
Description
Technical field
The invention belongs to the method that copper and copper alloy band protective atmosphere in continuous furnace switches, belong to the method for protective atmosphere switching when being used for brass, red copper band and heat especially at continuous furnace.
Background technology
Slow oxidation at room temperature just can take place in red copper and brass band.In atmospheric environment, when temperature was elevated to 100 ℃, copper strip surface will begin to generate cupric oxide (CuO); When temperature is increased to 185 ℃, just begin to generate red Red copper oxide (Cu
2O), oxidation rate significantly promotes; When temperature was elevated to more than 400 ℃, oxidation rate was parabolic shape and promotes.
Anneal in red copper and the brass band production process is generally all being carried out more than 400 ℃.For reducing the oxidation in the strand-anneal(ing) heat-processed; reduce the oxidational losses in the copper strips production process; finally obtain good copper strips product surface quality; usually in strand-anneal(ing) heat-processed, need carry out gas shield, for red copper and the brass band that is under the condition of high temperature provides neutrality or reducing atmosphere.
Nitrogen/hydrogen mixed gas that the protective atmosphere of red copper and brass band continuous furnace adopts liquefied ammonia to decompose to be obtained usually is as reducing atmosphere, and pure nitrogen gas is as neutral atmosphere, and air is not used usually as oxidizing atmosphere.Use nitrogen/hydrogen mixed gas or pure nitrogen gas that the annealing heat-processed of red copper and brass band is protected in the heat-processed, simultaneously, be the oxygen partial pressure in the control continuous furnace burner hearth, need to adopt pure nitrogen gas that the continuous furnace burner hearth is purged.
Because the oxygen level of red copper (the typical trade mark is T2) is generally between 250-450ppm, oxygen hardly solid solution in copper.In the red copper casting solidification process, oxygen is with (Cu+Cu
2O) form is separated out, and is distributed on the crystal boundary of copper.When annealing in containing the protective atmosphere of reductibility (as hydrogen), hydrogen permeate between crystal boundary with copper in Cu
2The O combination, reaction produces high-pressure steam, and water vapour is insoluble to copper, also can't spread, and forms very big pressure under the high temperature in copper, makes copper strips break, or cracks and break in follow-up processing or use, is commonly called as " hydrogen embrittlement ".
Because because the existence of zinc is arranged, and the activity of zinc is far above copper in the brass (the typical trade mark is H68, H65, H62), reaction has mainly all taken place with zinc in molten intravital oxygen in the melting of brass and castingprocesses, does not therefore have Cu in the crystal boundary of brass band
2O exists, and also just do not have " hydrogen embrittlement " tendency, but brass at high temperature, inevitably can produce the dezincify phenomenon.At first the vapour pressure of zinc is higher, just has the zinc start vaporizer in the temperature more than 650 ℃.Secondly, both make annealing heating in protective atmosphere, in atmosphere, contained H
2During O,, following reaction causes dezincify thereby will taking place.
Zn+H
2O＝ZnO↑+H
2↑
The zinc fume that produces is assembled in stove, and the condensation of temperature lower region is assembled in stove.In the Working environment of condensation accumulative zinc in destroying stove, also can influence the surface quality of the band of handling, even may cause stove to break down.
By guaranteeing the surface quality of the safe in utilization of continuous furnace and institute's processings brass band material, when adopting protective atmosphere to handle brass, annually need the blowing out maintenance once, to clear up the zinc powder of institute's enrichment in the stove.
Usually red copper is when the brass band carries out the kind conversion in process furnace; need stop to produce and in continuous furnace logical four to five hours pure nitrogen gas purge detect in the atmosphere in the continuous furnace burner hearth qualified after; again brass band is heated; the handoff procedure of whole protecting atmosphere is consuming time and waste a large amount of pure nitrogen gas, increases enterprise's production cost and delays enterprise's ordinary production arrangement.Can't satisfy enterprise's production requirement.
Summary of the invention
Problem to be solved by this invention is under the prerequisite that guarantees continuous furnace safe in utilization and red copper and brass band heating quality, does not need to feed red copper band that pure nitrogen gas the purges switching method to brass band protective atmosphere when process furnace is changed mutually.
The technical scheme of technical solution problem of the present invention is: the method that a kind of red copper and brass band protective atmosphere switch; red copper is pulled out from process furnace; directly close the protective atmosphere of red copper; and open fire door; brass is put into process furnace; adopt the protective atmosphere of air, get final product as brass annealing heating.
The protective atmosphere of described red copper is the gas mixture of hydrogen, nitrogen, and the volume ratio of hydrogen, nitrogen is 1-2: 99-98.
In order to prevent the deposition of brass when evaporation zinc in stove, also can in air, add the argon gas that percent by volume is 1-2%.
Because hydrogen is relevant with Heating temperature and time to the hazard rating of oxygen-bearing copper, rapid heating and unlikely generation " hydrogen embrittlement " immediately in short-term, and the red copper band is very violent in the oxidizing reaction of high temperature annealing heat-processed.Can adopt neutrality or little reducing gas as protective atmosphere when therefore red copper annealing is heated.
According to the analysis that required protective atmosphere characteristics are heated in the strand-anneal(ing) to red copper, final definite 2%H that adopts
2+ 98%N
2Nitrogen, hydrogen mixed gas atmosphere (volume).When the content of hydrogen increased, the red copper that will cause annealing produced hydrogen embrittlement, makes copper strips break, or cracked and break in follow-up processing or use.
The analysis of heating required protective atmosphere characteristics according to strand-anneal(ing) to brass; can adopt neutrality or reducing gas as protective atmosphere; but consider that zinc fume is to the influence in the continuous furnace stove; protective atmosphere when determining directly to adopt air to heat in the stove as the brass strand-anneal(ing), and in annealing heat-processed, open fire door.The requirement of required protective atmosphere can reduce the gathering of zinc fume in the stove again in the time of both can having satisfied the brass band to the annealing heating.
When the red copper band switches to processing brass band, directly close the required nitrogen that has excess hydrogen of red copper annealing heating, beginning brass band is handled.
The present invention compared with prior art has following characteristics:
1, employing has hydrogen, nitrogen mixture body as red copper strand-anneal(ing) heated protective atmosphere, the quality product when having guaranteed red copper strand-anneal(ing) heating.
2, the air that directly uses air or contain argon gas carries out the brass strand-anneal(ing) as the annealing heating atmosphere, when reducing atmosphere and consume, reduces in the annealing process zinc fume that brass volatilizes to the pollution of Working environment in the air cushion furnace.
3, adopt atmosphere switching method of the present invention, avoided adopting pure nitrogen gas to carry out purging required nitrogen consumption in the stove and having reduced the waiting time, saved product cost and energy consumption.
Embodiment
Below in conjunction with embodiment the present invention is done detailed explanation.
Embodiment 1:
The method that a kind of red copper and brass band protective atmosphere switch is pulled out red copper from process furnace, directly close the protective atmosphere of red copper, and open fire door, and brass is put into process furnace, adopts the protective atmosphere of air as brass annealing heating, gets final product.
The protective atmosphere of described red copper is the gas mixture of hydrogen, nitrogen, and the volume ratio of hydrogen, nitrogen is 1: 99.
Embodiment 2:
In order to prevent the deposition of brass when evaporation zinc in stove, also can in the air that feeds, add argon gas, the volume ratio of air and argon gas is 99: 1.Make the zinc fume that produces in the annealing heat-processed be not attached to burner hearth, guarantee Working environment cleaning in the burner hearth.
The red copper that the present invention produced, brass with red copper former explained hereafter, brass is as broad as long, and can shorten atmosphere greatly and switches purge time in the required stove, makes atmosphere switching time by changing to instant switching usually in required three to five hours.The most important thing is by switching method of the present invention, can directly reduce the consumption of the required protective atmosphere of heating anneal, compare existing mode, hydrogen, nitrogen mixture consumption reduce more than 50%.
Claims (3)
1. the method switched of red copper and brass band protective atmosphere is characterized in that: red copper is pulled out from process furnace, directly close the protective atmosphere of red copper; and open fire door; brass is put into process furnace, adopt the protective atmosphere of air, get final product as brass annealing heating.
2. the method that a kind of red copper according to claim 1 and brass band protective atmosphere switch, it is characterized in that: the protective atmosphere of described red copper is the gas mixture of hydrogen, nitrogen, the volume ratio of hydrogen, nitrogen is 1-2: 99-98.
3. the method that a kind of red copper according to claim 1 and brass band protective atmosphere switch is characterized in that: adding percent by volume in air is the argon gas of 1-2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110189025 CN102260837B (en) | 2011-07-07 | 2011-07-07 | Protective atmosphere switching method for red copper and brass strips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110189025 CN102260837B (en) | 2011-07-07 | 2011-07-07 | Protective atmosphere switching method for red copper and brass strips |
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| Publication Number | Publication Date |
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| CN102260837A true CN102260837A (en) | 2011-11-30 |
| CN102260837B CN102260837B (en) | 2013-03-06 |
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| CN 201110189025 Active CN102260837B (en) | 2011-07-07 | 2011-07-07 | Protective atmosphere switching method for red copper and brass strips |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555924A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
| CN103555926A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148112A (en) * | 1978-05-15 | 1979-11-20 | Nakagawa Kk | Bright annealing process |
| CN101196260A (en) * | 2007-03-17 | 2008-06-11 | 桂林漓佳金属有限责任公司 | Multiunit tube of red copper-brass and production technology thereof |
-
2011
- 2011-07-07 CN CN 201110189025 patent/CN102260837B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54148112A (en) * | 1978-05-15 | 1979-11-20 | Nakagawa Kk | Bright annealing process |
| CN101196260A (en) * | 2007-03-17 | 2008-06-11 | 桂林漓佳金属有限责任公司 | Multiunit tube of red copper-brass and production technology thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103555924A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
| CN103555926A (en) * | 2013-11-08 | 2014-02-05 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
| CN103555926B (en) * | 2013-11-08 | 2015-04-22 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement method for continuous annealing furnace |
| CN103555924B (en) * | 2013-11-08 | 2015-07-08 | 中冶南方(武汉)威仕工业炉有限公司 | Atmosphere replacement system of continuous annealing furnace |
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| Publication number | Publication date |
|---|---|
| CN102260837B (en) | 2013-03-06 |
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Address after: 241008 Anhui province Wuhu City Jiuhua economic and Technological Development Zone No. 8 North Road Patentee after: ANHUI TRUCHUM ADVANCED MATERIALS AND TECHNOLOGY CO., LTD. Address before: 241008 Anhui province Wuhu City Jiuhua economic and Technological Development Zone No. 8 North Road Patentee before: Anhui Jingcheng Copper Co., Ltd. |
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Effective date of registration: 20170515 Address after: Chong Hing two high tech Industrial Development Zone, Guangdong province Qingyuan City Road 511500 No. 15 Patentee after: QINGYUAN CHUCHUM COPPER INDUSTRY CO., LTD. Address before: 241008 Anhui province Wuhu City Jiuhua economic and Technological Development Zone No. 8 North Road Patentee before: ANHUI TRUCHUM ADVANCED MATERIALS AND TECHNOLOGY CO., LTD. |
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Effective date of registration: 20220425 Address after: 511500 No. 15, Chuangxing Second Road, high tech Industrial Development Zone, Qingyuan City, Guangdong Province (one site and multiple photos) Patentee after: Qingyuan Chujiang high precision copper strip Co.,Ltd. Address before: No.15, Chuangxing 2nd Road, Qingyuan hi tech Industrial Development Zone, Guangdong 511500 Patentee before: QINGYUAN CHUJIANG COPPER CO.,LTD. |