CN102268516A - Decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel - Google Patents
Decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel Download PDFInfo
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- CN102268516A CN102268516A CN2010102017598A CN201010201759A CN102268516A CN 102268516 A CN102268516 A CN 102268516A CN 2010102017598 A CN2010102017598 A CN 2010102017598A CN 201010201759 A CN201010201759 A CN 201010201759A CN 102268516 A CN102268516 A CN 102268516A
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Abstract
The invention provides a decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel. In the process, a horizontal type continuous decarburization and annealing coating unit is adopted, the thickness of a steel belt is 0.35-0.65mm, the operation speed of the steel belt is controlled to 70-100m/min, the tension of the steel belt in a continuous decarburization and annealing furnace is 1800-2200N; the temperatures of various furnace sections are controlled as follows: the furnace temperature of a preheating/ oxidation-free heating section is 1000-1100 DEG C, the furnace temperature of a radiant tube heating section is 900-920 DEG C, and the furnace temperature of a soaking section is 850-910 DGE C; apertures of a fan at a cooling section are 25-99% in turn; the pressures in the furnace are as follows: the pressure of an inlet is 25-30Pa, and the pressure of an outlet is 45-50Pa; and H2 and N2 are adopted as protective gas in the furnace, wherein the content of H2 is 25%-35%, the dew point value of the protective gas is 35+/-5 DEG C, and the flux of the protective gas is 350-420m<3>/h. In the invention, the process is adopted so as to not only ensure that the steel belt is smooth, the magnetic property, magnetic ageing and the like of the steel belt meet technical requirements, the qualified rate of a finished product is improved and waste quantity is reduced but also ensure that production is smoothly carried out.
Description
Technical field
The invention belongs to the decarburizing annealing technology, relate in particular to a kind of technology that adopts horizontal continuous decarburizing annealing coating unit to the low continuous decarburizing annealing of grade non-oriented silicon steel in the high-carbon content.
Background technology
In low grade cold rolling non-oriented silicon steel finished product C content requirement＜0.003% because carbon is utmost point harmful element, it forms interstitial solid solution with iron, makes lattice that serious distortion take place and causes that very big internal stress makes magnetic decline, P
15Increase, and produce serious magnetic aging.
Therefore require coils of hot-rolled steel C content≤0.005% as cold rolling feeds, with low grade cold rolling non-oriented silicon steel in guaranteeing after cold rolling, continuous decarburizing annealing operation under the conventional production process condition, C content reduced to requirement＜0.003%, with the magnetic property of low grade cold rolling non-oriented silicon steel finished product in guaranteeing.
In the actual production because a variety of causes causes C too high levels in the coils of hot-rolled steel, greater than 0.005%, it is the high-carbon content coil of strip, cold rolling after continuously the decarburizing annealing operation C content can not be reduced in the decarburization of conventional production process condition＜0.003% processing requirement, cause finished product magnetic to descend, cause trade mark qualification rate to reduce, influence the slight formation of magnetic property and fall the trade mark, influence the serious formation waste product of magnetic property, cause difficulty to production and operation.
Summary of the invention
The objective of the invention is to overcome the deficiency that above-mentioned prior art exists, provide a kind of can with the high-carbon content coils of hot-rolled steel of C content＞0.005% cold rolling after continuously the decarburizing annealing operation C content is reduced to below 0.003%, can guarantee the standard compliant continuous decarburizing annealing technology of finished product magnetic property simultaneously.
The object of the present invention is achieved like this: the low horizontal continuous decarburizing annealing coating unit of grade cold rolling non-oriented silicon steel decarburizing annealing process using in this high-carbon content, the thickness of steel band is 0.35～0.65mm, the steel band that is particularly useful for 0.50mm, the travelling speed of steel band is controlled at 70～100m/min, the tension force of steel band is 1800～2200N in the decarburization annealing furnace continuously, the temperature of each stove section is controlled to be: 1000～1100 ℃ of preheatings/nonoxidizing heating section (PH/NOF) furnace temperature, 900～920 ℃ of radiator tube heating zone (RTF) furnace temperature, 850～910 ℃ of soaking zone (SF) furnace temperature, cooling section blower fan aperture is followed successively by 25～99%, furnace pressure is: inlet 25～30Pa, outlet 45～50Pa adopts H in the stove
2+ N
2Shielding gas, wherein H
2Content volume per-cent is 25%～35%, and the dew point value of shielding gas is 35 ± 5 ℃, shielding gas feeding amount 350～420m
3/ h.
Shielding gas feeding position is the furnace wall of soaking zone both sides in the stove of the present invention.
Technological design reason of the present invention:
Coil of strip is at H
2+ N
2Mixed gas (H
2Content 25～35%) (about 35 ℃ of dew points) is heated rapidly to α-phase region and carries out decarburization, recrystallize and under a certain amount of water vapor conditions.Annealing temperature, annealing time, dew point can directly influence decarburization, crystal grain diameter size, contain certain amount of H in the atmosphere
2Be in order to guarantee to be with the steel light.Annealing temperature is low, magnetic property P
15Value is high, magnetic strength value height; Annealing temperature high magnetic characteristics P
15Be worth low, the magnetic strength value is low.
C in the steel at high temperature is diffused into surface and water vapor generation reversible reaction:
, P
CO.P
H2/ P
H2O=K, K are the decarburizing reaction equilibrium constant, P
CO, P
H2, P
H2OBe respectively CO, H
2, H
2The dividing potential drop of O, P
H2O/ P
H2Than being by H in the atmosphere
2Amount and dew point determine, represent the oxidisability of atmosphere, at decarburization situation, P
H2O/ P
H2Than being controlled at weak oxide atmosphere, CO constantly carries out decarburizing reaction along with furnace gas is constantly discharged.
Weak oxide decarburizing atmosphere also can make the band steel oxidation, and the oxide film that surface of steel plate forms hinders decarburizing reaction, therefore will control annealing temperature, annealing time (unit speed) and furnace atmosphere (P
H2OP
H2Than and dew point), decarburizing reaction is carried out prior to oxidizing reaction, too high or too low for temperature, overlong time or too short, water vapour is too much or the too high or too low decarburization effect that all can influence of very few dew point, contains certain amount of H in the atmosphere
2Be in order to alleviate the surface of steel plate oxidation, while H
2Be reducing atmosphere, in furnace gas, play reductive action.The annealing temperature height can cause energy dissipation, and annealing time long (unit speed is low) can cause the unit production capacity to reduce.
The control of stove internal tension can guarantee good template, also can make magnetic property P
15Value reduces, and the stove internal tension is crossed conference and caused magnetic property P
15Value increases.
Decarburizing annealing technology of the present invention is simple, reasonable, easy to operate, when adopting continuous decarburizing annealing coating unit to produce the high-carbon content coil of strip of C content＞0.005%, after technology decarburizing annealing of the present invention, again by coating and drying, curing, the finished product magnetic property of each trade mark all can meet the company standard of former trade mark product, can effectively avoid reducing because of abundant decarburization causes magnetic, causes production management to fall the trade mark or forms waste product.Adopt technology of the present invention can not only guarantee that steel band is smooth, make steel band magnetic property, magnetic aging etc. meet technical requirements, improve product percent of pass and lumber recovery, reduce rejection number, can also guarantee the production direct motion.
Description of drawings
Accompanying drawing is the synoptic diagram of horizontal continuous decarburizing annealing coating unit of the present invention.
1 is the preheating/nonoxidizing heating section (PH/NOF) of continuous decarburization annealing furnace among the figure, 2 is the radiator tube heating zone (RTF) of continuous decarburization annealing furnace, and 3 is the soaking zone furnace temperature (SF) of continuous decarburization annealing furnace, and 4 is continuous decarburization annealing furnace cooling section, 5 is coating machine, and 6 is drying oven.
Embodiment
The invention will be further described below by embodiment.
The low horizontal continuous decarburizing annealing coating unit of grade cold rolling non-oriented silicon steel decarburizing annealing process using in the embodiment of the invention high-carbon content.C content＞0.005%, thickness is that the cold-rolled steel coils of 0.50mm is successively through the preheating/nonoxidizing heating section (PH/NOF) 1 of continuous decarburization annealing furnace, radiator tube heating zone (RTF) 2, soaking zone furnace temperature (SF) 3, decarburization annealing furnace cooling section 4, coating machine 5 and the drying oven 6 continuously of decarburization annealing furnace continuously of decarburization annealing furnace continuously, by decarburization, recrystallization annealing, coating and coating drying with after solidifying, C content＜0.003% of finished product, magnetic property meets company standard.Table 1 is the decarburizing annealing technology and the end properties of the embodiment of the invention.
Table 1 embodiment of the invention decarburizing annealing technology and end properties
| Embodiment | 1 | 2 | 3 |
| The steel grade trade mark | 50AW1000 | 50AW800 | 50AW600 |
| Band steel specification | 0.5×1050mm | 0.5×1050mm | 0.5×1050mm |
| C content before the decarburization | 80ppm | 90ppm | 100ppm |
| Unit speed | 100m/min | 90m/min | 80m/min |
| The stove internal tension | 2000N | 2000N | 2000N |
| The PH/NOF furnace temperature | 1020℃ | 1050℃ | 1100℃ |
| The RTF furnace temperature | 900℃ | 900℃ | 920℃ |
| The SF furnace temperature | 850℃ | 870℃ | 910℃ |
| The inlet furnace pressure | 25Pa | 25Pa | 25Pa |
| The outlet furnace pressure | 50Pa | 50Pa | 50Pa |
| Protection gas in the stove | H 2+N 2 | H 2+N 2 | H 2+N 2 |
| H in the stove 2Content | 25％ | 25％ | 25％ |
| Dew point value in the stove | 37℃ | 36℃ | 35℃ |
| Protection gas feeds point | SF both sides furnace wall | SF both sides furnace wall | SF both sides furnace wall |
| Protection gas feeding amount | 400m 3/h | 400m 3/h | 400m 3/h |
| The cooling blower aperture | Successively 25～99% | Successively 25～99% | Successively 25～99% |
| (C) content after the decarburization | 24ppm | 25ppm | 27ppm |
| The end properties core loss value | P1.5＝6.8w/kg | P1.5＝5.8w/kg | P1.5＝4.6w/kg |
| End properties magnetic strength value | B5000＝1.71T | B5000＝1.7T | B5000＝1.65T |
Claims (3)
1. hang down grade cold rolling non-oriented silicon steel decarburizing annealing technology in a high-carbon content, it is characterized in that adopting horizontal continuous decarburizing annealing coating unit, the thickness of steel band is 0.35～0.65mm, the travelling speed of steel band is controlled at 70～100m/min, the tension force of steel band is 1800～2200N in the decarburization annealing furnace continuously, the temperature of each stove section is controlled to be: 1000～1100 ℃ of preheatings/nonoxidizing heating section furnace temperature, 900～920 ℃ of radiator tube heating zone furnace temperature, 850～910 ℃ of soaking zone furnace temperature, cooling section blower fan aperture is followed successively by 25～99%, furnace pressure is: inlet 25～30Pa, outlet 45～50Pa adopts H in the stove
2+ N
2Shielding gas, wherein H
2Content volume per-cent is 25%～35%, and the dew point value of shielding gas is 35 ± 5 ℃, shielding gas feeding amount 350～420m
3/ h.
2. low grade cold rolling non-oriented silicon steel decarburizing annealing technology in according to claim 1 is characterized in that shielding gas feeding position is the furnace wall of soaking zone both sides in the described stove.
3. low grade cold rolling non-oriented silicon steel decarburizing annealing technology in according to claim 1, the thickness that it is characterized in that described steel band is 0.50mm.
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| CN 201010201759 CN102268516B (en) | 2010-06-07 | 2010-06-07 | Decarburization and annealing process of high-carbon middle-and-low-grade cold rolling orientation-free silicon steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102560070A (en) * | 2012-01-10 | 2012-07-11 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of non-oxidation watermark in cold-rolled silicon steel continuous annealing furnace |
| CN102816903A (en) * | 2012-08-17 | 2012-12-12 | 河北省首钢迁安钢铁有限责任公司 | Sensing and heating method of high-magnetic induction oriented silicon steel |
| CN102912103A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Production method for non-oriented electric steel product with high longitudinal electromagnetic performance |
| CN103305744A (en) * | 2012-03-08 | 2013-09-18 | 宝山钢铁股份有限公司 | Production method for high-quality normalized silicon steel substrate |
| CN103882191A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Annealing method for total nitrogen produced cold-rolled non-oriented electrical steel |
| CN104017964A (en) * | 2014-06-12 | 2014-09-03 | 鞍钢股份有限公司 | Silicon steel heat treatment method |
| CN104673977A (en) * | 2015-02-10 | 2015-06-03 | 山西太钢不锈钢股份有限公司 | Startup warming method of continuous annealing furnace containing non-oxidation section silicon steel |
| CN106636576A (en) * | 2016-12-22 | 2017-05-10 | 北京首钢股份有限公司 | Method for improving oxidation chromatic aberration defect of continuous annealing line stove starting coil |
| WO2019080482A1 (en) * | 2017-10-24 | 2019-05-02 | 宝山钢铁股份有限公司 | Apparatus and method for rapidly heating cold-rolled strip steel |
| CN110358896A (en) * | 2019-05-23 | 2019-10-22 | 江苏北辰互邦电力股份有限公司 | A kind of high magnetic strength transformer orientation silicon steel production decarburization annealing process |
| CN111349742A (en) * | 2020-03-17 | 2020-06-30 | 本钢板材股份有限公司 | Production method of high-efficiency non-oriented silicon steel |
| US11131005B2 (en) * | 2016-04-19 | 2021-09-28 | Arcelormittal | Method for producing a metallic coated steel sheet |
| CN115305342A (en) * | 2022-08-12 | 2022-11-08 | 马鞍山钢铁股份有限公司 | Method for preventing furnace roller of non-oriented silicon steel annealing furnace from nodulation and abrasion |
| CN115369407A (en) * | 2021-05-19 | 2022-11-22 | 四川瑞致电工钢有限公司 | Preparation method of efficient non-oriented electrical steel |
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| CN102560070B (en) * | 2012-01-10 | 2013-08-28 | 山西太钢不锈钢股份有限公司 | Method for eliminating defect of non-oxidation watermark in cold-rolled silicon steel continuous annealing furnace |
| CN103305744A (en) * | 2012-03-08 | 2013-09-18 | 宝山钢铁股份有限公司 | Production method for high-quality normalized silicon steel substrate |
| US9738946B2 (en) * | 2012-03-08 | 2017-08-22 | Baoshan Iron & Steel, Co., Ltd. | Method for producing silicon steel normalizing substrate |
| CN103305744B (en) * | 2012-03-08 | 2016-03-30 | 宝山钢铁股份有限公司 | A kind of production method of high quality silicon steel normalizing substrate |
| US20150013846A1 (en) * | 2012-03-08 | 2015-01-15 | Baoshan Iron & Steel Co., Ltd. | Method for Producing Silicon Steel Normalizing Substrate |
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