CN102994708A - Cover-type furnace annealing process - Google Patents
Cover-type furnace annealing process Download PDFInfo
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- CN102994708A CN102994708A CN2012103915516A CN201210391551A CN102994708A CN 102994708 A CN102994708 A CN 102994708A CN 2012103915516 A CN2012103915516 A CN 2012103915516A CN 201210391551 A CN201210391551 A CN 201210391551A CN 102994708 A CN102994708 A CN 102994708A
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Abstract
The invention discloses a cover-type furnace annealing process which comprises the following steps of: filling a material into a furnace table; installing an inner cover; clamping the inner cover; vacuumizing for the first time; charging a protecting gas and blowing; installing a heating cover and igniting; heating and equalizing the temperature; cooling with the heating cover and removing the heating cover; cooling a radiation mode and installing a cooling cover; air-cooling and cooling in a spraying mode; removing the cooling cover; vacuumizing for the second time; loosening the inner cover and removing the inner cover; and discharging the material from the furnace table. The process is reasonable in design process, safe and reliable in procedure, stable in annealing mechanical property and good in quality of cold-rolled sheets, and thus the process is applicable to cold-rolled sheet cover-type annealing production working.
Description
Technical field
The present invention relates to a kind of annealing process, particularly a kind of batch annealing method is applicable to the production operation of cold rolled sheet bell-type annealing.
Background technology
The Annealing Process of Cold roll Steel Strip system is mainly according to the mechanical property of the chemical ingredients of steel, product, heavily wait factor to determine with gauge and the volume of steel.The volume interlayer was non-caked during process system must guarantee to produce, and oxidation does not appear in the surface.A. rate of heating is definite: the rate of heating of steel depends mainly on the size of the thermal conductivity of steel.Carbon content and alloy content are larger on the thermal conduction impact in the steel.Content such as them is high, and then thermal conductivity is little, and rate of heating will be suitably slow, avoids inside and outside temperature difference excessive and cause the inequality of tissue and performance.According to metal recrystallize principle, when the band steel was heated to 450 ℃ from room temperature, the metal Atom obtained certain kinetic energy, can carry out short-range motion, cold roller and deformed metal inside lattice defect is reduced, the lattice distortion degree alleviates, unrelieved stress reduces, but band steel interior tissue is without noticeable change.The band steel is heated to holding temperature by 450 ℃, and rate of heating has considerable influence to tissue, the performance with steel.The general provision heat-up rate is advisable with 30～50 ℃/h, and it is interval below 723 ℃ that the band steel is heated to holding temperature from 450 ℃, recrystallize formation stages just, thereby must be controlled in this temperature range rate of heating.B. holding temperature and soaking time is definite: the recrystallization temperature of steel is not a certain temperature of fixing, and it is relevant with mechanical property with band steel interior tissue state, and the recrystallization temperature in the actual production is selected according to product in 570～720 ℃ of scopes.Holding temperature and soaking time Main Basis product standard, technical qualification and steel grade are determined.Soaking time, holding temperature also heavy with volume, belt steel thickness is relevant, roll up great, steel plate is thick, holding temperature height then, soaking time also will be grown.Commute produces the steel of interlaminar bonding defective and the band steel of thin specification, and holding temperature can suitably be hanged down.C. clean annealing (application protective atmosphere): in the time of making the annealing of band steel without decarburization, non-oxidation must make steel band put with protective atmosphere among anneal, and make the pressure in the protective guard satisfy processing requirement.In addition, also to conscientiously do cold blowing and hot blow well.The purpose of cold blowing and hot blow is to utilize shielding gas to drive away the oil and gas and water that air in the inner cover and coil of strip are brought into.The effect of hot blow is except the residual gas in the inner cover further being caught up with to the greatest extent, the more important thing is that the objectionable impuritiess such as oil smoke that emulsion that coiled sheet is brought produces, water vapour are all driven away blows off, avoid staining surface of steel plate and reduce plate surface quality, bell type annealing furnace is the technical equipment that the development along with cold rolling technology gets up, widespread use and cold rolling enterprise.Whether the annealing process arrangement of bell furnace is reasonable, and whether program is proper, is related to the annealing quality of cold rolled sheet, energy-saving and cost-reducing and production safety.
Summary of the invention
Problem to be solved by this invention is, a kind of mantle-type annealing furnace process method is provided, and technical process is reasonable, and program safety is reliable, and cold rolled sheet annealing stable mechanical property, quality are good, are suitable for cold rolled sheet bell-type annealing produce line.
A kind of batch annealing method is characterized in that: the table charging, and dress inner cover and inner cover clamp, once vacuumize (0.094～-0.096MPa), fill protection gas (10m
3) and purge, dress heating mantles and igniting, heating and samming, be with the heating mantles cooling and remove heating mantles, radiation cooling (in the air radiations heat energy naturally cooling, be cooled to 500 ℃) and dress cooling cowl, air-cooled with spraying cooling, remove cooling cowl, secondary vacuum pumping is (0.096MPA), inner cover unclamps and removes inner cover, table discharging.
Annealing process of the present invention, it is characterized in that: after coil of strip is loaded onto table, lift inner cover and compress inner cover by bolt, protection gas intake valve cuts out, vacuum pump is opened, furnace pressure is evacuated to-0.096MPa, keeps pressure 20 minutes, and back pressure then satisfies the resistance to air loss requirement less than-0.002MPa, open protection gas intake valve, close exhaust emission valve, in stove, fill protection gas, simultaneously heating mantles is loaded onto, when furnace pressure reaches 3000Pa, exhaust emission valve is opened, and furnace pressure is remained on prepare igniting between the 3000-5000Pa, and about 10 minutes of peak flow air purge are used in the heating mantles space before the igniting; Start strong recirculation blower, initial stage is moved under 750 rev/mins rotating speed, rotating speed forwards 1480 rev/mins to during 300 ℃ of atmosphere temperature convergences, keeps 1480 rev/mins rotating speed in follow-up heating and samming process blower fan, continues to move under 750/1480 rev/min of rotating speed before cooling finishes; The pressure of protection gas in inner cover is by pressure transmitter and pressure switch monitoring; Annealing is closed the natural gas intake valve after ending, and burner blower stops, and heating mantles hangs away, and cooling cowl is loaded onto; After atmosphere temperature was down to 300 ℃, recirculation blower went to low-speed running, air-cooled stopping; spraying cooling begins, and is down to tapping temperature (80 ℃) when steel roll temperature, closes protection gas intake valve, exhaust emission valve; open the vacuum pump secondary vacuum pumping, furnace pressure is evacuated to-0.096MPa, opens the air inlet valve; when furnace pressure is balanced to barometric point; close vacuum pump and recirculation blower, remove cooling cowl, unclamp inner cover; hang away inner cover and prepare to come out of the stove, the production cycle finishes.
Positively effect of the present invention:
The present invention has optimized the technical process of bell type annealing furnace, and program safety is reliable, and stable mechanical performance after the cold rolled sheet annealing has good deep drawability, is applicable to the production operation of cold rolled sheet bell-type annealing.
Description of drawings:
Fig. 1 is a kind of mantle-type annealing furnace process method flow of the present invention synoptic diagram;
Fig. 1 illustrates the charging of 1. tables; 2. dress inner cover and inner cover clamp, and 3. once vacuumize, and 4. fill protection gas and purging; 5. dress heating mantles and igniting; 6. heating and samming 7. are with the heating mantles cooling and are removed heating mantles, 8. radiation cooling and dress cooling cowl; air-cooled and spraying cooling, remove cooling cowl; 10. secondary vacuum pumping, 11. inner covers are unclamped and are removed inner cover, 12 table dischargings.
Embodiment
In order to explain more fully enforcement of the present invention, provide following processing method embodiment.These embodiments only are to explain rather than limit the scope of the invention.The used protection gas of the present invention, natural gas all have commercially available.
Embodiment 1
Table charging à 2. dress inner covers and inner cover clamp à 3. once vacuumize à 4. fill protection gas and purge à 5. dress heating mantleses and igniting à 6. heating and samming à 7. band heating mantleses coolings and remove heating mantles à 8. radiation cooling and dress cooling cowl à 9. air-cooled with spraying cooling, remove cooling cowl à 10. secondary vacuum pumping à 11. inner covers and unclamp and remove inner cover à 12 table dischargings.
After coil of strip is loaded onto table, lift inner cover and compress inner cover by bolt, protection gas intake valve cuts out, vacuum pump is opened, furnace pressure is evacuated to-0.094MPa, kept pressure 20 minutes, back pressure then satisfies the resistance to air loss requirement less than-0.002MPa, opens protection gas intake valve, closes exhaust emission valve, in stove, fill protection gas, simultaneously heating mantles is loaded onto, furnace pressure reaches 3000Pa and is, protection gas bleed valve is opened, furnace pressure is remained on prepare igniting between the 4000Pa, about 10 minutes of peak flow air purge are used in the heating mantles space before the igniting; Start strong recirculation blower, initial stage is moved under 750 rev/mins rotating speed, rotating speed forwards 1480 rev/mins to during 300 ℃ of atmosphere temperature convergences, keeps 1480 rev/mins of rotating speeds in follow-up heating and samming process blower fan, continues to move under 750/1480 rev/min of rotating speed before cooling finishes; The pressure of protection gas in inner cover is by pressure transmitter and pressure switch monitoring; Annealing is closed the gas inlet valve after ending, and burner blower stops, and heating mantles hangs away, and cooling cowl is loaded onto; After atmosphere temperature was down to 300 ℃, recirculation blower went to low-speed running, air-cooled stopping; spraying cooling begins, and is down to tapping temperature (85 ℃) when steel roll temperature, closes protection gas intake valve, exhaust emission valve; open the vacuum pump secondary vacuum pumping, furnace pressure is evacuated to-0.096MPa, opens the air inlet valve; when furnace pressure is balanced to barometric point; close vacuum pump and recirculation blower, remove cooling cowl, unclamp inner cover; hang away inner cover and prepare to come out of the stove, the production cycle finishes.
Embodiment 2
After coil of strip is loaded onto table, lift inner cover and compress inner cover by bolt, protection gas intake valve cuts out, vacuum pump is opened, furnace pressure is evacuated to-0.096MPa, kept pressure 20 minutes, back pressure then satisfies the resistance to air loss requirement less than-0.002MPa, opens protection gas intake valve, closes exhaust emission valve, in stove, fill protection gas, simultaneously heating mantles is loaded onto, furnace pressure reaches 3000Pa and is, protection gas bleed valve is opened, furnace pressure is remained on prepare igniting between the 5000Pa, about 10 minutes of peak flow air purge are used in the heating mantles space before the igniting; Start strong recirculation blower, initial stage is moved under 750 rev/mins rotating speed, rotating speed forwards 1480 rev/mins to during 300 ℃ of atmosphere temperature convergences, keeps 1480 rev/mins of rotating speeds in follow-up heating and samming process blower fan, continues to move under 750/1480 rev/min of rotating speed before cooling finishes; The pressure of protection gas in inner cover is by pressure transmitter and pressure switch monitoring; Annealing is closed the gas inlet valve after ending, and burner blower stops, and heating mantles hangs away, and cooling cowl is loaded onto; After atmosphere temperature was down to 300 ℃, recirculation blower went to low-speed running, air-cooled stopping; spraying cooling begins, and is down to tapping temperature (80 ℃) when steel roll temperature, closes protection gas intake valve, exhaust emission valve; open the vacuum pump secondary vacuum pumping, furnace pressure is evacuated to-0.096MPa, opens the air inlet valve; when furnace pressure is balanced to barometric point; close vacuum pump and recirculation blower, remove cooling cowl, unclamp inner cover; hang away inner cover and prepare to come out of the stove, the production cycle finishes.
Embodiment 3
A kind of batch annealing method, the table charging, dress inner cover and inner cover clamp, and once vacuumize the 0.094MPa at ﹣, keep 15 minutes, fill protection gas 10m
3/ t and purging, dress heating mantles and igniting, heating and samming, band heating mantles cooling and remove heating mantles, the radiation cooling, in the air radiations heat energy naturally cooling, be cooled to 500 ℃ and dress cooling cowl, air-cooled and spraying cooling, remove cooling cowl, secondary vacuum pumping is at ﹣ 0.096MPa, and inner cover unclamps and removes inner cover, table discharging.
Embodiment 4
Annealing process: after coil of strip is loaded onto table, lift inner cover and compress inner cover by bolt, protection gas intake valve cuts out, vacuum pump is opened, furnace pressure is evacuated to-0.096MPa, kept pressure 20 minutes, back pressure then satisfies the resistance to air loss requirement less than-0.002MPa, opens protection gas intake valve, closes exhaust emission valve, in stove, fill protection gas, simultaneously heating mantles is loaded onto, when furnace pressure reached 3000Pa, exhaust emission valve was opened, furnace pressure is remained on prepare igniting between the 3000-5000Pa, peak flow air purge 10 minutes are used in the heating mantles space before the igniting; Start strong recirculation blower, initial stage is moved under 750 rev/mins rotating speed, rotating speed forwards 1480 rev/mins to during 300 ℃ of atmosphere temperature convergences, keeps 1480 rev/mins rotating speed in follow-up heating and samming process blower fan, continues to move under 750/1480 rev/min of rotating speed before cooling finishes; The pressure of protection gas in inner cover is by pressure transmitter and pressure switch monitoring; Annealing is closed the gas inlet valve after ending, and burner blower stops, and heating mantles hangs away, and cooling cowl is loaded onto; After atmosphere temperature is down to 300 ℃; recirculation blower goes to low-speed running; air-cooled stopping; spraying cooling begins; when steel roll temperature is down to 80 ℃ of tapping temperatures; close protection gas intake valve, exhaust emission valve; open the vacuum pump secondary vacuum pumping, furnace pressure is evacuated to-0.096MPa, opens the air inlet valve; when furnace pressure is balanced to barometric point; close vacuum pump and recirculation blower, remove cooling cowl, unclamp inner cover; hang away inner cover and prepare to come out of the stove, protection gas, Sweet natural gas that the production cycle finishes the application of this processing method all have the specialty supply.This processing method is reasonable in design, and is safe and reliable, is suitable for industrialized production.Cold rolled sheet annealing stable mechanical property, superior in quality.
Claims (2)
1. batch annealing method is characterized in that: the table charging, dress inner cover and inner cover clamp, and once vacuumize the 0.096MPa at ﹣ 0.094～﹣, keep 15～20 minutes, fill and protect gas 10m
3/ t and purging, dress heating mantles and igniting, heating and samming, band heating mantles cooling and remove heating mantles, the radiation cooling, in the air radiations heat energy naturally cooling, be cooled to 500 ℃ and dress cooling cowl, air-cooled and spraying cooling, remove cooling cowl, secondary vacuum pumping is at ﹣ 0.096MPa, and inner cover unclamps and removes inner cover, table discharging.
2. annealing process claimed in claim 1, it is characterized in that: after coil of strip is loaded onto table, lift inner cover and compress inner cover by bolt, protection gas intake valve cuts out, vacuum pump is opened, furnace pressure is evacuated to-0.096MPa, keeps pressure 20 minutes, and back pressure then satisfies the resistance to air loss requirement less than-0.002MPa, open protection gas intake valve, close exhaust emission valve, in stove, fill protection gas, simultaneously heating mantles is loaded onto, when furnace pressure reaches 3000Pa, exhaust emission valve is opened, and furnace pressure is remained on prepare igniting between the 3000-5000Pa, and peak flow air purge 10 minutes are used in the heating mantles space before the igniting; Start strong recirculation blower, initial stage is moved under 750 rev/mins rotating speed, rotating speed forwards 1480 rev/mins to during 300 ℃ of atmosphere temperature convergences, keeps 1480 rev/mins rotating speed in follow-up heating and samming process blower fan, continues to move under 750/1480 rev/min of rotating speed before cooling finishes; The pressure of protection gas in inner cover is by pressure transmitter and pressure switch monitoring; Annealing is closed the gas inlet valve after ending, and burner blower stops, and heating mantles hangs away, and cooling cowl is loaded onto; After atmosphere temperature was down to 300 ℃, recirculation blower went to low-speed running, air-cooled stopping; spraying cooling begins, and is down to 80 ℃ of tapping temperatures when steel roll temperature, closes protection gas intake valve, exhaust emission valve; open the vacuum pump secondary vacuum pumping, furnace pressure is evacuated to-0.096MPa, opens the air inlet valve; when furnace pressure is balanced to barometric point; close vacuum pump and recirculation blower, remove cooling cowl, unclamp inner cover; hang away inner cover and prepare to come out of the stove, the production cycle finishes.
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| CN2012103915516A CN102994708A (en) | 2012-10-16 | 2012-10-16 | Cover-type furnace annealing process |
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| CN2012103915516A CN102994708A (en) | 2012-10-16 | 2012-10-16 | Cover-type furnace annealing process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103740924A (en) * | 2013-12-20 | 2014-04-23 | 鞍钢股份有限公司 | Method for overcoming rusting defect of bell-type furnace |
| CN105349766A (en) * | 2015-12-18 | 2016-02-24 | 安徽楚江科技新材料股份有限公司 | Copper strip cover-type furnace annealing technology |
| CN108070692A (en) * | 2017-11-30 | 2018-05-25 | 重庆徐丁科技有限公司 | A kind of steel alloy motorcycle accessories annealing process |
| CN108165729A (en) * | 2017-12-22 | 2018-06-15 | 湖北大帆金属制品有限公司 | A kind of reciprocating annealing process of novel cold rolling strip bell furnace |
| CN108977629A (en) * | 2018-08-22 | 2018-12-11 | 上海宝钢包装钢带有限公司 | The method for annealing of Varying-thickness vehicle dormer window crossbeam |
| CN110453060A (en) * | 2019-09-11 | 2019-11-15 | 东莞市升华炉具设备有限公司 | Homogenizer |
| CN111944961A (en) * | 2020-08-13 | 2020-11-17 | 上海宝钢新材料技术有限公司 | Annealing method of variable-thickness automobile plate |
| CN112226597A (en) * | 2020-10-16 | 2021-01-15 | 四川汇源钢建科技股份有限公司 | Cold rolling annealing method for cold-rolled strip steel |
| CN113234916A (en) * | 2021-05-21 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Cover type annealing process for HC340LA low-alloy high-strength steel cold-rolled coil |
| CN114045380A (en) * | 2021-11-09 | 2022-02-15 | 山西太钢不锈钢股份有限公司 | Control method for annealing stamp of 400 series stainless steel bell-type furnace |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114646434A (en) * | 2022-03-20 | 2022-06-21 | 山西太钢不锈钢股份有限公司 | Automatic detection device for air tightness of all-hydrogen bell-type furnace load space and use method |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
| CN117887955A (en) * | 2024-03-15 | 2024-04-16 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102367505A (en) * | 2011-11-10 | 2012-03-07 | 安徽精诚铜业股份有限公司 | Method for increasing surface brightness of cover furnace annealing strip |
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2012
- 2012-10-16 CN CN2012103915516A patent/CN102994708A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102367505A (en) * | 2011-11-10 | 2012-03-07 | 安徽精诚铜业股份有限公司 | Method for increasing surface brightness of cover furnace annealing strip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103740924B (en) * | 2013-12-20 | 2017-07-21 | 鞍钢股份有限公司 | A kind of method for eliminating bell furnace corrosion defect |
| CN103740924A (en) * | 2013-12-20 | 2014-04-23 | 鞍钢股份有限公司 | Method for overcoming rusting defect of bell-type furnace |
| CN105349766A (en) * | 2015-12-18 | 2016-02-24 | 安徽楚江科技新材料股份有限公司 | Copper strip cover-type furnace annealing technology |
| CN108070692A (en) * | 2017-11-30 | 2018-05-25 | 重庆徐丁科技有限公司 | A kind of steel alloy motorcycle accessories annealing process |
| CN108165729A (en) * | 2017-12-22 | 2018-06-15 | 湖北大帆金属制品有限公司 | A kind of reciprocating annealing process of novel cold rolling strip bell furnace |
| CN108977629A (en) * | 2018-08-22 | 2018-12-11 | 上海宝钢包装钢带有限公司 | The method for annealing of Varying-thickness vehicle dormer window crossbeam |
| CN110453060A (en) * | 2019-09-11 | 2019-11-15 | 东莞市升华炉具设备有限公司 | Homogenizer |
| CN111944961B (en) * | 2020-08-13 | 2021-11-30 | 上海宝钢新材料技术有限公司 | Annealing method of variable-thickness automobile plate |
| CN111944961A (en) * | 2020-08-13 | 2020-11-17 | 上海宝钢新材料技术有限公司 | Annealing method of variable-thickness automobile plate |
| CN112226597A (en) * | 2020-10-16 | 2021-01-15 | 四川汇源钢建科技股份有限公司 | Cold rolling annealing method for cold-rolled strip steel |
| CN113234916A (en) * | 2021-05-21 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Cover type annealing process for HC340LA low-alloy high-strength steel cold-rolled coil |
| CN114045380A (en) * | 2021-11-09 | 2022-02-15 | 山西太钢不锈钢股份有限公司 | Control method for annealing stamp of 400 series stainless steel bell-type furnace |
| CN114525382A (en) * | 2021-12-09 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114525382B (en) * | 2021-12-09 | 2024-04-26 | 山西太钢不锈钢股份有限公司 | Method for improving annealing uniformity of bell-type furnace |
| CN114646434A (en) * | 2022-03-20 | 2022-06-21 | 山西太钢不锈钢股份有限公司 | Automatic detection device for air tightness of all-hydrogen bell-type furnace load space and use method |
| CN115584384A (en) * | 2022-10-19 | 2023-01-10 | 攀钢集团攀枝花钢钒有限公司 | Method and system for processing high-temperature test incompatibility of bell-type furnace |
| CN117887955A (en) * | 2024-03-15 | 2024-04-16 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
| CN117887955B (en) * | 2024-03-15 | 2024-05-10 | 包头市威丰稀土电磁材料股份有限公司 | Process control method for normalizing non-oriented electrical steel by adopting single high-temperature annealing furnace |
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Application publication date: 20130327 |