CN100455405C - Method for producing non-oriented electrical steel sheet with insulating coating - Google Patents
Method for producing non-oriented electrical steel sheet with insulating coating Download PDFInfo
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- CN100455405C CN100455405C CNB2005100282634A CN200510028263A CN100455405C CN 100455405 C CN100455405 C CN 100455405C CN B2005100282634 A CNB2005100282634 A CN B2005100282634A CN 200510028263 A CN200510028263 A CN 200510028263A CN 100455405 C CN100455405 C CN 100455405C
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- 238000001816 cooling Methods 0.000 description 3
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- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 3
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- 239000012298 atmosphere Substances 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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- Chemical Treatment Of Metals (AREA)
Abstract
本发明提供一种带有绝缘涂层的无取向电工钢板的制造方法，其工艺流程为：轧硬卷→前清洗→连续退火→弱酸酸洗→后清洗→涂层→干燥烘烤→成品卷。实施本发明后可生产出具有优良绝缘性、附着性、耐蚀性、焊接性、耐热性和冲片性良好的电工钢板。The invention provides a method for manufacturing a non-oriented electrical steel sheet with an insulating coating. The process flow is: hard rolled coil → pre-cleaning → continuous annealing → weak acid pickling → post-cleaning → coating → drying and baking → finished coil . After the invention is implemented, electrical steel sheets with excellent insulation, adhesion, corrosion resistance, weldability, heat resistance and good punching properties can be produced.
Description
Technical field
The present invention relates to a kind of manufacture method of non-oriented electromagnetic steel sheet of tape insulation coating.
Background technology
Usually electrical sheet rolls hard volume through the continuous annealing unit, also directly enters the coating unit after the drying through cleaning section water flushing later again, applies baking according in the past half organic insulation coating film build method on the electrical sheet substrate then, obtains the finished product electric steel plate.
Be illustrated in fig. 1 shown below, the technological process of producing electrical sheet in the prior art is: roll hard volume → preceding cleaning → continuous annealing → back cleaning → coating → drying baking → finished product volume.
The process conditions in above-mentioned each step of processing step are as follows:
The first step is rolled hard volume.That passes through the cold rolling mistake of cold continuous rolling rolls hard volume thickness specification at 0.35mm～0.65mm, and silicon content is 0.3～2.0%.
Second step, preceding cleaning.Clean being with steel in the operation of rolling, to stay, otherwise the various oils of remained on surface will form the carbonaceous stain in annealing process, pollute furnace atmosphere, influence decarburization efficient as ROLLING OIL, antirust oil, dust and oxidation film layer etc.Generally with 1～5%NaOH alkali lye, temperature is controlled at about 80 ℃, in addition 80 ± 10 ℃ of hydro-peenings of hot water, oven dry supervisor.
The 3rd step, continuous annealing.Electrical steel strip through continuous annealing with the mechanical performance that is used to improve electrical steel strip with eliminate residual stress, and by improving crystal grain and decarburization improves magnetic.Annealing section furnace temperature can reach 900～950 ℃ temperature, and the belt steel surface temperature reaches about 800～850 ℃.In this temperature, the band steel enters soaking zone insulation certain hour, finishes recrystallization process, passes through slow cooling again, plurality of processes such as cold soon, air cooling and back cleaning section water-cooled, and annealing time finally reaches the annealing purpose in 80-150 second.
In the 4th step, the back is cleaned.Back cleaning section can wash floating dust and other dirt that adheres to belt steel surface in the annealing furnace on the one hand; Also playing the belt steel temperature that cooling effect makes outlet side on the other hand maintains in the 20-25 ℃ of temperature range.Whole back cleaning section working medium is a pure water, and water temperature is controlled at about 18 ℃.
The 5th step, coating.Utilize coating machine that pre-prepd masking liquid evenly is coated in belt steel surface, the control wet-film thickness is at 20～40 μ m.
The 6th step, dry baking.The dry baking of band steel that will the coating masking liquid, control furnace temperature be at 300～600 ℃, its surface become have the coating of insulating properties and other performances.
The 7th step, the finished product volume.The finished product bundling is transported to the user.
The formation method of relevant insulating coating mainly is in the above-mentioned steps five:
1) the inorganic masking liquid that with the chromate is main component is coated in through continuous annealing after after on the electrical sheet steel band that cleans of cleaning section, and then carry out the method that dry baking forms insulating coating;
2) be after the inorganic constituents of main component is added organic resin simultaneously and formed half organic masking liquid with the chromate, the method for carrying out dry baking, or the like.
Yet, with above-mentioned 1) the coating punching that forms of method too poor, serious to the diel damage, in the user, seldom use.With 2) method, when higher coating layer thickness need the raising of the trade mark that produces, in using process, coating occurred and peeled off easily, be i.e. the problem of tack difference.
But during problem, along with the rising of the electrical sheet trade mark, the motor that the user makes is also more and more high to the requirement of insulating properties, means that the thickness of coating is wanted corresponding increase.Carry out in the process of itemize and high speed punching at the electrical sheet finished product, owing to will implement tension force to steel band, and the clamping rubbing action of clips and the tension force effect when curling, make the coating shedding phenomenon happen occasionally, cause the performance of mould impaired and unshakable in one's determination (non-oriented electromagnetic steel sheet is a functional material of making electric machine iron core) to descend, and cause the production cost of motor to increase or the like the generation of a series of problems.
Therefore, the existing invention appearance of being devoted to improve coating quality, as Japanese patent laid-open 4-110476 (denomination of invention: the electric steel plate manufacture method that tack and insulating properties are good after the stress relief annealing, applicant: Kobe system iron institute of Co., Ltd., the announcement time: on April 10th, 1992) and the spy open flat 2-38582 (denomination of invention: the electric steel plate that forms insulating coating, applicant: Kobe system iron institute of Co., Ltd., announcement time: February 7 nineteen ninety).Wherein, open chela and the thing that proposes a kind of titanium in half organic masking liquid among the flat 4-110476, after being coated in the electrical sheet substrate surface and forming dielectric film, can effectively improve tack and insulating properties after stress relief annealing the spy.But this kind method need change the character of original coating, does not have the improvement of essence to improving the finished product tack.Open among the flat 2-38582 the spy and to propose, apply a kind of silicate earlier on the electrical sheet surface, carry out forming the silicate underlying membrane behind the dry solidification, and then coating contains chromic acid or phosphate, dry solidification forms the upper strata coating once more, and in two layers of coating liquid, add organic resin and silane coupling agent in one deck at least, thereby form the good electric steel plate of coating tack.Yet this kind method need apply the baking secondary, the cost of manufacture height, and production efficiency is low.
Therefore, press for a kind of new method and can overcome the problems referred to above, improve the quality index such as tack of electric steel plate insulating coating.
Summary of the invention
Therefore, the purpose of this invention is to provide a kind of manufacture method that has the non-oriented electromagnetic steel sheet of insulating coating,, make its insulating coating tack good.
Above-mentioned purpose of the present invention realizes by following processing step: roll hard volume → preceding cleaning → continuous annealing → weak acid pickling → back cleaning → coating → drying baking → finished product volume.
Wherein, the concrete condition of above-mentioned each processing step is as follows:
The first step is rolled hard volume.That passes through the cold rolling mistake of cold continuous rolling rolls hard volume thickness specification at 0.35mm～0.65mm, and its silicon content is 0.3～2.0%.
Second step, preceding cleaning.The cleaning band steel in the operation of rolling, stay as ROLLING OIL, antirust oil, transportation machine oil, dust and oxidation film layer etc., otherwise the various oils of remained on surface will form the carbonaceous stain in annealing process, pollute furnace atmosphere, influence decarburization efficient.Generally with 1～5%NaOH alkali lye, temperature is controlled at about 80 ℃, in addition 80 ± 10 ℃ of hydro-peenings of hot water, oven dry supervisor.
The 3rd step, continuous annealing.Electrical steel strip through continuous annealing with the mechanical performance that is used to improve electrical steel strip with eliminate residual stress, and by improving crystal grain and decarburization improves magnetic.Annealing section furnace temperature can reach 900～950 temperature, and the belt steel surface temperature reaches about 800～850 ℃.In this temperature, the band steel enters soaking zone insulation certain hour, finishes recrystallization process, passes through slow cooling again, plurality of processes such as cold soon, air cooling and back cleaning section water-cooled, and annealing time finally reaches the annealing purpose in 80-150 second.
The 4th step, the weak acid pickling.Move back band steel that unit comes out at this section usefulness 1%～15%H from connecting
3PO
4A kind of in the solution such as solution, dilution heat of sulfuric acid, oxalic acid solution, acetum, the addition of acid is controlled at 1%～15% of solution total amount, through scrubbing → soak → process extracted, being with the solution on the steel to squeeze out.Both washed and sticked, floating dust confused, and the floating embroidery on surface had been removed, also activated the surface of band steel simultaneously, made closelyr, improved adhesion with combining of the masking liquid of postorder with the carbon of belt steel surface.
Sour content is controlled between 1%～15%, and less than 1% o'clock, because the amount of acid is few, not enough things such as floating rust with substrate surface reacted fully, do not have the effect of cleaning and activating surface, if greater than 15%, operating cost were increased.The best scope of application preferably is controlled between 5%～12%.
In the 5th step, the back is cleaned.Back cleaning section can further be cleaned the weak acid that remains in belt steel surface on the one hand, and the belt steel temperature that keeps outlet side is in 20-25 ℃ of scope.Whole back cleaning section working medium is a pure water, and water temperature is controlled at about 18 ℃.
The 6th step, coating.Utilize coating machine that pre-prepd masking liquid evenly is coated in belt steel surface, the control wet-film thickness is at 20～40 μ m.Adopt the mode of half organic thick coating to prepare treatment fluid, i.e. masking liquid (base fluid wherein is a water), and enforcement coating on the notch type roll coater.
The salt that the salt of chromic acid or its Zn, Mg, Ca, K etc. and phosphoric acid or its Al, Mg, Na, Ca, K etc. are arranged in the above-mentioned masking liquid (coating treatment fluid).In order to improve punching, also added the organic resin latax that contains more than one, mainly contain acrylic resin, vinyl acetate resin, phenolic resins, epoxy resin or the like, the percentage by weight that the amount of its adding accounts for treatment fluid is 10%～50%.In order to improve overall performances such as hear resistance, in treatment fluid, also be added with an amount of boric acid and reducing agent or the like in addition.Use roll coater that above-mentioned mixed treatment fluid is coated in surface treated electrical sheet substrate surface,
The 7th step, dry baking.The band steel that applies masking liquid is entered furnace temperature to be toasted in 300～600 ℃ dry oven, 150～450 ℃ of the steel billet temperatures of control baking, preferably 150～360 ℃ of dry bakings, stoving time 20～60 seconds forms insulating properties, tack, corrosion resistance, weldability, hear resistance and the good electric steel plate of punching.
In this step, the coating amount of last dry film is controlled at the scope of 0.5～4g/m2, preferably is controlled in the scope of 1.5～2.8g/m2, coating amount is too little, do not reach the due performance of coating, coating amount is too big, the tack of coating is descended greatly and the increase of production cost.
The 8th step, the finished product volume.The finished product bundling is transported to the user.
Implement to produce thick coating electrical steel product behind the present invention with excellent adhesion.On the production unit that the present invention can be applicable to the skin covering of the surface tack is had relatively high expectations, can significantly improve the adhesion of skin covering of the surface and substrate, promote the total quality of product, form insulating properties, tack, corrosion resistance, weldability, hear resistance and the good electric steel plate of punching.
The specific embodiment
It below is the example explanation that the present invention produces the non-oriented electromagnetic steel sheet of the good insulating coating of band tack.
Example 1-6: electric steel plate that thickness 0.5mm is annealed immerses under the normal temperature H that contains variable concentrations by following 1%, 5%, 7%, 10%, 12%, 15% etc.
3PO
4Solution in the several seconds, carry out after the back cleans, and by following coating formula preparation treatment fluid:
A. chromic acid or contain the chromate of the above metals of divalence such as Mg, Ca, Zn, its percentage by weight is 2～20%;
B. organic resin, its percentage by weight is 1～10%;
C. reducing agent, its percentage by weight is 0.5～5%;
D. boric acid, its percentage by weight is 0.5～5%;
Surplus is a water.
And on the notch type roll coater, implement coating, and entering dry baking in the oven then, the baking temperature of steel plate is controlled at 150～360 ℃, stoving time 20～60 seconds, build is controlled at 1.8～2.8g/m2, the results are shown in Table 1.
The quality index actual achievement of table 1 insulating coating
Example 7-12:
The thick electric steel plate of 0.5mm immersed contain different content H such as 1%, 5%, 8%, 10%, 12%, 15% under the normal temperature
2SO
4Solution in the several seconds, after the drying, press half identical organic thick coating formulated treatment fluid of embodiment 1-6, and on the notch type roll coater, implement to apply, enter dry baking in the oven then, the steel billet temperature of baking is controlled at 150～360 ℃, stoving time 20～60 seconds, and film thickness monitoring is at 1.8～2.8g/m
2, embodiment 7-12 the results are shown in Table 2.
The quality index actual achievement of table 2 insulating coating
Example 13-17
The thick electric steel plate of 0.5mm immersed contain different content H such as 1%, 5%, 8%, 12%, 15% under the normal temperature
2C
2O
4Solution in the several seconds, after the drying, press half identical organic thick coating formulated treatment fluid of embodiment 1,2,3, and on the notch type roll coater, implement to apply, enter dry baking in the oven then, baking temperature is controlled at 150～360 ℃, stoving time 20～60 seconds, and build is controlled at 1.8～2.8g/m
2, embodiment 13-17 the results are shown in Table 3.
The quality index actual achievement of table 3 insulating coating
Above coating performance is measured according to following method:
Insulating properties: carry out about the assay method of interface resistance by JIS C 2550.
Tack: the test of posting adhesive tape with electric steel plate on, use
Crooked 180 ° of 10mm rod sample flattening, again with tape stripping, is judged the area that peels off that sticks to the adhesive tape upper nonconductive Film.
◎: do not have and peel off; Zero: minute quantity is peeled off; △: peel off on a small quantity; *: peel off in a large number.
Tack behind the SRA: sample is carried out stress relief annealing under 750 ℃ * 2h, N2 atmosphere, judge with the tape stripping method then.◎: do not have and peel off; Zero: minute quantity is peeled off; △: peel off on a small quantity.
Corrosion resistance: carry out brine spray test in 7 hours, judge the corrosion resistance of dielectric film according to giving birth to the degree of embroidering.◎: non-corroding; Following corrosion in zero: 30%; △: below 70%; *: a large amount of corrosions.
Constant temperature and humidity: under 50 ℃ and 80%RH relative humidity, carry out 14 days test by a definite date, observe its surface corrosion degree.◎: non-corroding; Following corrosion in zero: 5%; △: 30% following corrosion.
Claims (6)
1. manufacture method that has the non-oriented electromagnetic steel sheet of insulating coating, it is characterized in that, the technological process of this method is: roll hard volume → preceding cleaning → continuous annealing → weak acid pickling → back cleaning → coating → drying baking → finished product volume, wherein said weak acid pickling comprise scrub → soak → step of extracting and the addition of acid be controlled at 1%～15% of solution total amount.
2. manufacture method as claimed in claim 1 is characterized in that, adopts dilution heat of sulfuric acid in the step of described weak acid pickling.
3. manufacture method as claimed in claim 1 is characterized in that, adopts oxalic acid solution in the step of described weak acid pickling.
4. manufacture method as claimed in claim 1 is characterized in that, adopts acetum in the step of described weak acid pickling.
5. manufacture method as claimed in claim 1 is characterized in that the addition of described acid is controlled at 5%～12% of solution total amount.
6. manufacture method as claimed in claim 1, it is characterized in that, in described coating step, adopt half organic thick coating formulated treatment fluid, and on the notch type roll coater, implement coating, and entering dry baking in the oven of 300～600 ℃ of furnace temperature then, the steel billet temperature of baking is controlled at 150～360 ℃, stoving time 20～60 seconds, build is controlled at 1.5～2.8g/m
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| CN101314807B (en) * | 2008-06-26 | 2011-05-04 | 东莞市源殿电子科技有限公司 | High-temperature processing method for non-orientation magnetic material |
| CN102837158A (en) * | 2011-06-21 | 2012-12-26 | 祁成 | Manufacturing technique of front fork steel tube of electrombile |
| CN103255278B (en) * | 2012-02-21 | 2015-04-22 | 宝山钢铁股份有限公司 | Strip steel annealing method |
| CN106475416A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | Production method of cold-rolled electrical steel with excellent punching performance |
| CN109013253B (en) * | 2018-07-02 | 2021-08-03 | 山西太钢不锈钢股份有限公司 | Production method of electrical steel self-bonding coating |
| CN111318434A (en) * | 2018-12-13 | 2020-06-23 | 宝山钢铁股份有限公司 | Treatment method of non-oriented electrical steel material |
| CN112011250A (en) * | 2020-08-24 | 2020-12-01 | 湖北武洲新材料科技有限公司 | Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel |
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| CN1078270A (en) * | 1991-10-22 | 1993-11-10 | 浦项综合制铁株式会社 | Non-oriented electromagnetic steel sheet that has excellent magnetic characteristics and method for making thereof |
| CN1175979A (en) * | 1995-12-19 | 1998-03-11 | 浦项综合制铁株式会社 | Process for producing nondirectional electrical steel sheet excellent in close adhesion of insulating film |
| JP2001158950A (en) * | 1999-12-03 | 2001-06-12 | Kawasaki Steel Corp | Electromagnetic steel sheet for small electrical equipment and method of manufacturing the same |
| CN1532003A (en) * | 2003-03-21 | 2004-09-29 | 宝山钢铁股份有限公司 | Coating method for self adhesive coating of electrical steel |
| KR20040087159A (en) * | 2003-04-04 | 2004-10-13 | 주식회사 포스코 | Insulation coating method of electric steel sheet and Insulation coating electric steel sheet thereof |
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