CN102041449A - Method for improving electromagnetic performance of oriented electric steel by low-temperature plate blank heating process - Google Patents
Method for improving electromagnetic performance of oriented electric steel by low-temperature plate blank heating process Download PDFInfo
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Abstract
The invention discloses a method for improving the electromagnetic performance of oriented electric steel by a low-temperature plate blank heating process, and belongs to the technical field of oriented electric steel. By adjusting an interannealing technology, high temperature normalization is carried out through an interannealing process, A1N is separated out dispersedly after being solutionized in the normalization process, therefore, as one of the recrystallization inhibitors, the action of A1N is played effectively, and the effective inhibiting ability of the educt A1N+ (Mn, Cu) X S is strengthened further. A casting blank is subject to hot rolling, normalization, acid washing and first cold rolling after heated at the temperature of 1150-1250 DEG C, a multisection type interannealing technology for improving the function of an inhibitor is carried out, then secondary cold rolling with non-restoring or restoring process, and a finished product with the perfect secondary recrystallization texture is obtained after high temperature annealing of a coating. The aim for improving the electromagnetic performance of the product is achieved, simultaneously the decarburization efficiency can be improved and the bottom layer quality of the product can be enhanced by adopting the three-stage annealing technique.
Description
Technical field
The invention belongs to the oriented electrical steel technical field, particularly relate to a kind of method that improves low temperature slab heating process oriented electrical steel electromagnetic performance.Specifically, carry out multistage (three sections or two sections) intermediate annealing process after employing slab low-temperature heat and the steel band once cold rolling, obtain the better oriented electrical steel production method of magnetic property.
Background technology
The good magnetic property of grain-oriented electrical steel sheet comes from its Goss texture that forms by secondary recrystallization in final high-temperature annealing process.
In order to obtain secondary recrystallization tissue preferably; the production method of traditional oriented electrical steel is to be main inhibitor with AlN or MnS; in the high-temperature heater of special use, slab is heated to＞1300 ℃; so that the thick complete solid solution of MnS, AlN in the strand is separated out with the small and dispersed attitude after hot rolling or the normalizing.The shortcoming of this production method has the height production cost, shortcomings such as low production efficiency and lumber recovery.Oriented electrical steel low temperature slab heating technique becomes a focus of domestic and international research for this reason.
Reduce directional silicon steel slab Heating temperature production oriented electrical steel at present and mainly contain two kinds of approach, one class is that intrinsic inhibitor method is promptly by the improvement on the composition, as use the low inhibitor of new solid solubility temperature or strengthen the composition of inhibitor, realize reducing slab heating temperature; Another kind of method is called " obtaining the inhibitor method " and does not promptly require the complete solid solution of inhibitor forming element in slab heat-processed, but obtains inhibitor by the method for carrying out the nitriding processing before high temperature annealing, thereby can further reduce slab heating temperature.
Intrinsic inhibitor method low temperature slab heating technique, owing to heating installation that does not need special-purpose special use and nitriding annealing device etc., partly equipping with other steel grade production lines can be general, has the production efficiency height, low cost and other advantages.Present intrinsic inhibitor method mainly is to reach the purpose that reduces slab heating temperature by adding formation solid solubility temperatures such as Cu than AlN and the lower inhibitor of MnS.
It is main inhibitor that Korea S Pohang Iron and Steel Corporation proposes with AlN, Cu
2S and MnS are auxiliary inhibitor, and strand adopts twice cold-rolling practice of band process annealing at 1250-1320 ℃ of scope internal heating, produces common orientated and high magentic induction oriented electrical steel.
Thyssen also adopts Cu
2S+AlN is that main inhibitor has been reduced to 1260～1280 ℃ to slab heating temperature, and hot rolling is adopted the once cold rolling method and carried out cold rolling timeliness after 980～1080 ℃ of normalizing.
The common orientated electrical steel that Yi Xiete and Xin Lipeicike factory produce in the Russia, Cu in the composition, Mn content is higher and partly added Ni, and Cr etc. are with Cu
2S+AlN is main inhibitor, it is cold rolling to carry out the first time after heating of 1250～1280 ℃ of low temperature slabs and the hot rolling, finishes the steel plate decarburization in the process annealing stage, thereby can omit the decarburizing annealing technology behind the secondary cold-rolling, and replace primary recrystallization annealing with low temperature recovery annealing, reduced energy consumption.
Also introduced a kind of manufacturing process of low-temperature oriented electrical steels among the patent CN1414119A of Wuhan Iron and Steel Company, with Mn, the sulfide of Cu is main inhibitor, is heating hot rolling under the temperature condition more than 1280 ℃, takes cold-rolling practice twice, be preheating to 490～550 ℃ earlier after for the first time cold rolling, insulation 35～80s is heated to 860 ℃ then and carries out centre decarburizing annealing, and it is cold rolling to carry out the second time again, through decarburizing annealing, high temperature annealing becomes the oriented electrical steel finished product.
And Acciai Speciali Terni S.P. A. is in the CN1228817A of application in 1997; its described composition is being on the main inhibitor basis with AlN and MnS (or MnSe); add and strengthen inhibitor element S n; water cast out thin slab after; carry out 1150～1300 ℃ of Heating temperatures, normalizing after the hot rolling is adopted greater than 80% draft once cold rolling method; control annealing atmosphere during final high temperature annealing, the amount of nitrogen sucking that makes steel is less than 50ppm.This method mainly is suitable for sheet blank continuous casting explained hereafter oriented electrical steel.
This type of technology, master operation is the secondary cold-rolling method of full decarburization in the middle of adopting, carbon amount with steel plate when twice cold rolling annealing is reduced to (middle full decarburizing annealing) below the 30ppm, be cold rolled to for the second time directly to be coated with the magnesium oxide separant or after low temperature recovery annealing, to be coated with the magnesium oxide separant behind the finished product thickness and carry out high temperature annealing and subsequent disposal, but owing to adopt the heating of low temperature slab, AlN is less in the course of hot rolling solid solution amount of separating out, the effect performance is insufficient, therefore magnetic levels is not high, is used for producing common orientation silicon steel more.The shortcoming that also has the bottom layer quality poor stability in addition.
Summary of the invention
The object of the present invention is to provide a kind of method that improves low temperature slab heating process oriented electrical steel electromagnetic performance, mainly solve with Al, N, Mn, Cu, S are the relatively poor and bottom layer quality problem of unstable of magnetic property that the oriented silicon steel of inhibitor exists.
The present invention is by adjusting intermediate annealing process, carried out the high temperature normalizing by the process annealing process, AlN disperse after the solid solution of normalizing process being separated out; therefore; as the more effective performance of a kind of its effect of recrystallize inhibitor, further (Mn, Cu) the xS precipitate effectively suppresses ability to REINFORCED Al N+.Strand hot rolling after 1150～1250 ℃ of heating after pickling, once cold rolling, improves the multi-stage type intermediate annealing process of inhibitor effect, secondary cold-rolling afterwards, do not reply or reply processing, after the coating high-temp annealing, obtain having the finished product that improves the secondary recrystallization tissue.Reach the purpose that improves the product electromagnetic performance, adopt the three-stage process annealing process can also improve decarburization efficient simultaneously and improve the bottom layer quality of product.Concrete processing step is as follows:
(1) supplied materials strand chemical ingredients: C 0.01～0.06%, Si 2～4%, and Mn 0.05～0.3%; S 0.003～0.03%, and Cu 0.2～0.6%; N 0.005～0.01%; Als 0.01～0.035%; Remainder is Fe and inevitable impurity; Can add B or Sn etc. in addition and further stablize the secondary recrystallization element.
(2) hot rolling: strand rolls into the thick hot-rolled sheet of 1.8～4.0mm 1150～1250 ℃ of heating;
(3) once cold rolling: carry out once cold rolling after the hot-rolled sheet pickling, the once cold rolling draft is controlled at 50%～70%;
(4) employing three or two-part annealing: first section 1000～1120 ℃ are carried out entering into second section 810～860 ℃ of soaking zone with 10～15 ℃/s cooling after 30～120s annealing, at the nitrogen of first section feeding clean dry; Second section feeds wet 5～30% hydrogen and nitrogen mixture body, is the middle gross decarburization annealing of carrying out 7～15min under 0.2～0.65 condition at intrinsic standoff ratio, and the carbon content of steel plate is reduced to below the 30ppm; At the steel plate of 1～1.5mm thickness, adopt syllogic promptly to carry out the reduced anneal of 700～800 ℃ pure hydrogen at the 3rd section.If adopt syllogic, can shorten second section annealing time 1～4min, improve the decarburization effect, can improve the surface and the oxide film bottom layer quality of steel plate simultaneously.Control oxygen level in 300～800ppm scope at second section.
(5) carry out secondary cold-rolling, be rolled to the finished product desired thickness;
(6) do not reply or carry out 400～650 ℃ of recovery annealings, replying needs to feed wet 5～50% hydrogen and nitrogen mixture body, and the intrinsic standoff ratio span of control is 0.2～0.65;
(7) be coated with the MgO annealing separating agent;
(8) finished product high temperature annealing.Speed 900-1100 ℃ of stage with 10 ℃/h heats up, and atmosphere is 75%H2 and 25%N
2, and in 1200 ℃ of pure dried H
2Middle insulation 6-8 hour.
The invention has the advantages that, on common copper containing orientation composition of steel basis, can suitably improve Al content in the steel, by multi-stage type process annealing, further bring into play the restraining effect of A1N, thereby A1N and (Mn have been strengthened, Cu) the inhibition ability of precipitate such as xS, and then improved the electromagnetic performance of oriented electrical steel, also help improving simultaneously the product bottom layer quality.
Embodiment
Embodiment 1
The chemical ingredients (wt%) of steel A continuously cast bloom is as table 1.
The chemical ingredients (wt%) of table 1 steel A continuously cast bloom
| C | Si | Als | Mn | Cu | S | N | Sn |
| 0.05 | 3.2 | 0.03 | 0.091 | 0.48 | 0.012 | 0.0085 | 0.05 |
The alloying constituent such as the table 1 of strand, all the other are iron and unavoidable impurities.Strand is incubated hot rolling behind the 2.5h in 1200 ℃ of process furnace.Hot-rolled steel sheet thickness is at 2.5mm, carry out once cold rolling after the pickling to 1mm, the i.e. 1120 ℃ * 30s short-cycle annealing under dried purity nitrogen condition of syllogic is adopted in process annealing, enter with 15 ℃/s speed afterwards and carry out the annealing of 810/840 ℃ * 10min gross decarburization under the wet hydrogen nitrogen mixed gas atmosphere, carry out the high hydrogen reducing of 800 ℃ * 3～5min subsequently, through after the process annealing, carbon content is reduced to below 0.003%.For the second time be cold rolled to 0.30mm, do not reply or carry out 550 ℃ of recovery annealings, be coated with the MgO annealing separating agent, carry out high temperature annealing then, speed 900～1100 ℃ of stages with 10 ℃/h heats up, and atmosphere is 75%H2 and 25%N2, and is incubated 6-8 hour in 1200 ℃ of pure dried H2.。Magnetic the results are shown in Table 2.
Table 2 low-temperature heating oriented electrical steel finished product magnetic property
Remarks: technologies such as the comparative example composition is identical with the example composition, and hot rolling is cold rolling are also identical, and difference is process annealing and replys technology.
Embodiment 2
Table 3 experimental steel chemical ingredients unit: wt%
| Embodiment | C | Si | Als | Mn | Cu | S | N |
| B | 0.045 | 3.19 | 0.023 | 0.21 | 0.31 | 0.015 | 0.0089 |
The alloying constituent such as the table 3 of strand, all the other are iron and unavoidable impurities.Strand is incubated hot rolling behind the 2.5h in 1150 ℃ of process furnace.Hot-rolled steel sheet thickness is at 2.2mm.Carry out once cold rolling after the pickling to 0.7mm, the i.e. 1000 ℃ * 30s short-cycle annealing under dried purity nitrogen condition of syllogic is adopted in process annealing, fast cold afterwards entering carried out the annealing of 835 ℃ * 5～7min gross decarburization under wet 30%H2 and the 70%N2 mixed atmosphere, carry out reduction of 800 ℃ * 3min pure hydrogen or not reduced anneal subsequently.Be cold rolled to for the second time 0.30mm.Carry out 550 ℃ of recovery annealings; Being coated with MgO is main separant, carries out high temperature annealing then, and the speed 900～1100 ℃ of stages with 10 ℃/h heats up, and atmosphere is 75%H2 and 25%N2, and is incubated 6-8 hour in 1200 ℃ of pure dried H2.。Magnetic the results are shown in Table 4.
Remarks: comparative example adopts 1360 ℃ of slab heating, and conventional secondary cold-rolling technology, example are 1150 ℃ of low temperature slab heating.
For invention sample among embodiment 1 and the embodiment 2, the sample bottom layer quality is observed behind the secondary cold-rolling, and syllogic process annealing cooperates replys technology, and brighter and bottom layer quality of sample and tack are better.
Claims (2)
1. method that improves low temperature slab heating process oriented electrical steel electromagnetic performance is characterized in that processing step is:
(1) supplied materials strand chemical ingredients: C 0.01～0.06%, Si 2～4%, and Mn 0.05～0.3%; S 0.003～0.03%, and Cu 0.2～0.6%; N 0.005～0.01%; Als 0.01～0.035%; Remainder is Fe and inevitable impurity;
(2) hot rolling: strand rolls into the thick hot-rolled sheet of 1.8～4.0mm 1150～1250 ℃ of heating;
(3) once cold rolling: carry out once cold rolling after the hot-rolled sheet pickling, the once cold rolling draft is controlled at 50%～70%;
(4) employing three or two-part annealing: first section 1000～1120 ℃ are carried out entering into second section 810～860 ℃ of soaking zone with the cooling of 10～15 ℃/s speed after 30～120s annealing, at the nitrogen of first section feeding clean dry; Second section feeds wet 5～30% hydrogen and nitrogen mixture body, is the middle gross decarburization annealing of carrying out 7～15min under 0.2～0.65 condition at intrinsic standoff ratio, and the carbon content of steel plate is reduced to below the 30ppm;
At the steel plate of 1～1.5mm thickness, adopt syllogic promptly to carry out the reduced anneal of 700～800 ℃ pure hydrogen, annealing time 3～5min at the 3rd section; When adopting syllogic, shorten second section annealing time 1～4min, improve the decarburization effect, improve the surface and the bottom layer quality of steel plate simultaneously, control oxygen level in 300～800ppm scope at second section;
(5) carry out secondary cold-rolling, be rolled to the finished product desired thickness;
(6) do not reply or carry out 400～650 ℃ of recovery annealings, replying needs to feed wet 5～50% hydrogen and nitrogen mixture body, and intrinsic standoff ratio is controlled at 0.2～0.65 scope;
(7) be coated with the MgO annealing separating agent;
(8) finished product high temperature annealing.Speed 900-1100 ℃ of stage with 10 ℃/h heats up, and atmosphere is 75%H2 and 25%N2, and is incubated 6-8 hour in 1200 ℃ of pure dried H2.
2. method according to claim 1 is characterized in that, adds B or Sn in the supplied materials strand chemical ingredients, further stablizes the secondary recrystallization element.
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| CN103695620A (en) * | 2013-12-16 | 2014-04-02 | 武汉钢铁(集团)公司 | Method for producing oriented silicon steel with excellent underlying quality |
| CN103774042A (en) * | 2013-12-23 | 2014-05-07 | 钢铁研究总院 | High-magnetic-induction oriented silicon steel prepared through thin slab continuous casting and rolling and preparation method thereof |
| CN104226954A (en) * | 2014-08-25 | 2014-12-24 | 东北大学 | Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel |
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| CN103695620B (en) * | 2013-12-16 | 2016-01-06 | 武汉钢铁(集团)公司 | The production method of the oriented silicon steel that a kind of bottom layer quality is excellent |
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| CN103774042A (en) * | 2013-12-23 | 2014-05-07 | 钢铁研究总院 | High-magnetic-induction oriented silicon steel prepared through thin slab continuous casting and rolling and preparation method thereof |
| CN104726669A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Preparation method of low-iron-loss medium-frequency oriented silicon steel ultrathin belt |
| CN103774042B (en) * | 2013-12-23 | 2016-05-25 | 钢铁研究总院 | A kind of CSP high magnetic induction grain-oriented silicon steel and preparation method thereof |
| CN104726669B (en) * | 2013-12-23 | 2017-04-26 | 鞍钢股份有限公司 | Preparation method of low-iron-loss medium-frequency oriented silicon steel ultrathin belt |
| CN104226954A (en) * | 2014-08-25 | 2014-12-24 | 东北大学 | Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel |
| CN104226954B (en) * | 2014-08-25 | 2016-10-19 | 东北大学 | Precipitate and inclusion control method during twin-roll thin strip continuous casting non-orientation silicon steel |
| CN107002161A (en) * | 2014-11-27 | 2017-08-01 | Posco公司 | Oriented electrical steel and its manufacture method |
| US11031162B2 (en) | 2014-11-27 | 2021-06-08 | Posco | Grain-oriented electrical steel sheet and manufacturing method therefor |
| CN107002161B (en) * | 2014-11-27 | 2019-11-29 | Posco公司 | Oriented electrical steel and its manufacturing method |
| CN106480282A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | A kind of production method of the efficient electrical sheet of No yield point |
| CN106480281A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | A kind of production method of high magentic induction oriented electrical sheet |
| CN106480305A (en) * | 2015-08-24 | 2017-03-08 | 鞍钢股份有限公司 | A kind of production method improving cold rolling electric decarburization efficiency |
| CN107488815A (en) * | 2017-08-25 | 2017-12-19 | 包头钢铁（集团）有限责任公司 | A kind of medium temperature orientation silicon steel hot rolled strip and preparation method thereof |
| CN110983004A (en) * | 2019-12-04 | 2020-04-10 | 新万鑫（福建）精密薄板有限公司 | Production process of bottom-layer-free ultrathin strip oriented silicon steel master strip |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |