CN1261241C - Production method of unidirectional electromagnetic steel plate with high magnetic intensity - Google Patents
Production method of unidirectional electromagnetic steel plate with high magnetic intensity Download PDFInfo
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- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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Abstract
In order to provide a cold rolling method for obtaining a grain oriented silicon steel sheet using AlN as an inhibitor by which thinning can be combined with increase of magnetic flux density, wherein a slab having a composition containing 0.025-0.100% C, 2.5-4.5% Si and 0.007-0.040% Al is hot-rolled; the resultant plate is cold-rolled one or more times after hot rolled plate annealing or while process-annealed between the cold rolling stages; and the resultant sheet is subjected to primary recrystallization annealing and then to secondary recrystallization annealing, characterized in that, final cold rolling is performed using a reversing mill and rolling is carried out using work rolls of 95-180 mm phi diameter, the diameter of the roller is changed during the rolling process.
Description
Technical field
The present invention relates to the manufacture method of the one-way electromagnetic steel plate that the core material in the electric machines such as transformer and generator uses.
Background technology
One-way electromagnetic steel plate must have good magnetization and iron loss characteristic on rolling direction.The quality of magnetization characteristic depends on the size of the magnetic field intensity of iron core internal induction in certain magnetic field, and the goods that magnetic field intensity is big can make the iron core miniaturization.Iron loss be when iron core applies predetermined AC magnetic field as the power loss of thermal energy consumption, the size of magnetic field intensity, thickness of slab, skin covering of the surface tension force, impurity content, resistivity, crystal grain, magnetic domain width etc. is fine or not influential to iron loss all.Wherein importantly, magnetic field intensity is big more, and thickness of slab is thin more, and iron loss is more little.
Because the development of manufacturing technology now, can industrial-scale production for example in the steel plate of thickness of slab 0.23mm, magnetic field intensity B8 (value during magnetic coercive force 800A/m) is that 1.92T, iron loss W17/50 (value during maximal magnetization when 50Hz, 1.7T) are the like this good goods of 0.85W/kg.Therefore the countermeasure that heats up as the earth in recent years, the one-way electromagnetic steel plate of the thickness direction that wish that the exploitation thickness of slab is 0.20, the magnetic field intensity of 0.18mm etc. is higher.
One-way electromagnetic steel plate with this good magnetism characteristic, easy magnetizing axis with iron is＜001〉the direction texture consistent with the rolling direction height of steel plate, when the last mechanical refining of manufacturing process, general formation huge the having of preferentially growing is called as [110]＜001 of this (goss, crystal orientation silicon steel sheet) direction of so-called dagger-axe〉the so-called phenomenon of secondary recrystallization of the crystal grain of direction.
As making the primary condition that this direction crystal grain of this dagger-axe is preferential and fully grow up, in the secondary recrystallization process, exist to suppress to have the inhibitor of growth of the crystal grain of the not preferred direction except that this direction of dagger-axe, and form the primary recrystallization tissue that this direction crystal grain of dagger-axe is preferentially grown up to easily, be well known fact.
Herein, as inhibitor, generally adopt AlN, Mn (S, Se), Cu
2(S, the Se) precipitate of Denging, or also the cyrystal boundary segregation of auxiliary oriented Sn, Sb is inclined to strong composition.In addition, the primary recrystallization tissue is very important for grain size and uniformity and the crystal grain that forms the direction of the corresponding relation with this direction crystal grain of dagger-axe and Ge Si direction to the set tissue of rolling direction unification.
Known in the past have a method that obtains the high one-way electromagnetic steel plate of magnetic field intensity, for example open in clear No. 4623820 communiques the Japan Patent spy disclosed, well-known with AlN as the method for inhibitor.This method is by high temperature heating slab, makes the inhibitor composition solid solution of AlN, makes in final annealing before cold rolling then that AlN is fine to separate out, with the method for manufacturing one-way electromagnetic steel plate.
In addition, open the method for the low temperature slab heating that discloses the nitrogen treatment formation AlN inhibitor of using subsequent handling in the clear 62-40315 communique the Japan Patent spy.This method is developed for fear of the equipment of high temperature slab heating and the defective of operation.
In such manufacture method, just not can not get high magnetic field intensity if having suitable primary recrystallization to organize as everyone knows with the AlN inhibitor.The formation of primary recrystallization tissue is caught a cold deeply and is rolled condition effect, and preferably, general final cold rolling compression ratio is up to more than 81%.Cold rolling about other disclosed 1) the technology of between strong cold rolling passage, carrying out 50～350 ℃ * Ageing Treatment more than 1 minute in the special public clear 54-13846 communique of Japan Patent; Or 2) 1～30 second the technology of maintenance under 300～600 ℃ in the special public clear 54-29182 communique of Japan Patent.Above-mentioned 1) technology technology is the technology that is intended to reversible rolling, above-mentioned 2) is to be intended to the rolling technology of tandem.
Adopt the high temperature rolling of tandem mill, equipment and operational technical difficulty are arranged, and present technology is utilized the processing of reversible rolling to give birth to heat to carry out high temperature rolling, utilize the timeliness effect after rolling the reeling in the operation of rolling.Reversible mill is that the diameter of working roll is more little with the general milling train of four, six etc. working roll arranged in series, and roller is got over easy deformation, adopts the above major diameter roller of 250mm usually.
On the other hand, gloomy formula multi-roll mill or NMS milling train with bunch shape configuration of six, 12,20 etc. roller set owing to be polygonal reserve working roll, can use the working roll of minor diameter.Because one-way electromagnetic steel plate contains a large amount of Si, rolling bounce height is reducing to use the working roll of minor diameter more favourable aspect the sheet thickness.Therefore, the high temperature rolling of one-way electromagnetic steel plate adopts collection bunch type reversable mill mostly.
On the other hand, about the work roll diameter of cold press, disclose 3) technology of carrying out with the minor diameter roller below the 300mm in rolling whole passages or back segment passage in the special public clear 50-37130 communique of Japan Patent; 4) open in the flat 02-282422 communique in the back segment passage with the minor diameter roller of 30～100mm rolling technology between 150～230 ℃ the spy; 5) open in flat No. 0533056 communique in the leading portion passage with the minor diameter roller of 50～150mm rolling technology between 150～350 ℃ the spy; 6) open in the flat 09-287025 communique with the working roll (technology of the big rising rolling temperature of the increasing diameter of 40～500mm) (100～350 ℃) the spy.
Summary of the invention
The collection that existing electromagnetic steel plate is used bunch formula milling train is that the gloomy formula multi-roll mill of representative is its main flow with 21,22 types.From guaranteeing the viewpoint of the rolling property of thickness, mainly use the following minor diameter working roll of 95mm.For example, above-mentioned 5) the technology roller diameter in is 50～150mm, has put down in writing the example of 80 and 90mm in an embodiment.
In addition, in the manufacturing of the one-way electromagnetic steel plate that contains Al, as above-mentioned 3) shown in, the diameter of a cold roll collection bunch formula milling train the smaller the better, that help attenuate meets this requirement.In addition, as above-mentioned 4)～6) in disclosed shown in, even be that from the viewpoint of magnetism characteristic, the roller of minor diameter is favourable in prerequisite rolling with the Ageing Treatment between passage.
The inventor to the collection bunch type reversable mill between passage, implement in the manufacturing that contains the Al one-way electromagnetic steel plate of Ageing Treatment, work roll diameter has been carried out detail analysis to the influence of magnetism characteristic.The result, magnetic field intensity is low when being rolled with the work roll diameter below the existing 90mm, finds to have the effect that improves magnetic field intensity (Japan Patent special be willing to flat 2000-002944 specification) when more rolling than the working roll of existing big diameter 95～170mm and use.
But in the manufacturing of thin material, from the viewpoint of rolling bounce, large diameter working roll is disadvantageous.For this reason, whether the effect that work roll diameter is increased is effectively studied in rolling leading portion passage and back segment passage.The result shows, if implement the rolling of major diameter working roll in rolling leading portion passage, can see that the effect of magnetism characteristic raising is big.This is with above-mentioned 3) and 4) the result of technology opposite.Therefore, in the present invention in order to make thin material, if adopt major diameter working roll cold-rolling mill to carry out middle temperature rolling to interior thickness with 95～170mm, then with other cold-rolling mill for example the minor diameter roller below the 65mm to be rolled down to twice cold-rolling mill of final thickness of slab rolling be good.But this method has cold rolling constant expense to be increased, the shortcoming of production efficiency difference.
If can change the diameter of working roll, then this problem can overcome, but that uses in the manufacturing of existing one-way electromagnetic steel plate is basic comprising as the gloomy formula multi-roll mill of representative with the housing of monolithic devices with 21,22 types, is difficult to change work roll diameter in the rolling pass process.For this reason, the collection bunch formula milling train that the inventor uses the housing by Splittable to constitute in the manufacturing of one-way electromagnetic steel plate at first, successfully realized in rolling leading portion passage rolling with the working roll more than the diameter 95mm, be replaced by in the back segment passage and be suitable for the rolling minor diameter working roll of little thickness, established the technology of making the high thickness one-way electromagnetic steel plate of magnetic field intensity with a milling train with low fixed charge, high production rate.
The high cold rolling technology of efficient that the present invention effectively controls study of the Chinese classic discovery and housing Splittable collection bunch formula milling train to the effect of the major diameter working roll of collection bunch formula milling train at leading portion organically combines.Its main inventive point is as follows.
(1) a kind of manufacture method of one-way electromagnetic steel plate of magnetism characteristic good, wherein, to containing percentage by weight C:0.025～0.10%, Si:2.5～4.5%, the electromagnetism steel thick plate of Al:0.007～0.040% carries out after the hot rolling, hot rolled plate is annealed, implement once cold rolling or be interspersed with above cold rolling of twice of intermediate annealing, carry out primary recrystallization annealing afterwards, carry out secondary recrystallization annealing then again, the method is characterized in that: with the working roll diameter is that the reversible mill of 95～180mm carries out finally cold rolling, and the thickness of slab in the operation of rolling changes the diameter of working roll in the stage, make the work roll diameter of leading portion passage bigger.
(2) as the manufacture method of the one-way electromagnetic steel plate of (1) described magnetism characteristic good, it is characterized in that: carry out finally cold rolling with reversible mill, and the working roll that is 95～180mm as final cold rolling leading portion passage diameter is cold rolled to the middle thickness of slab that is at least below the 0.40mm, then change the diameter of working roll, with diameter D≤T
fThe working roll of * 520 (mm) carries out from middle thickness of slab to final thickness of slab T
f(mm) cold rolling.
(3) as the manufacture method of the one-way electromagnetic steel plate of (1) or (2) described magnetism characteristic good, it is characterized in that: at least one in the final cold rolling passage in above-mentioned cold-rolled process, the steel plate band is kept time more than at least 1 minute in 100～350 ℃ temperature range.
(4) as the manufacture method of the one-way electromagnetic steel plate of (1) or (2) described magnetism characteristic good, it is characterized in that: it is 0.03～0.45% Mn that described electromagnetism steel thick plate contains percentage by weight.
(5) as the manufacture method of the one-way electromagnetic steel plate of (1) or (2) described magnetism characteristic good, it is characterized in that: the goods thickness of slab is below the 0.23mm.
(6) as the manufacture method of the one-way electromagnetic steel plate of (1) or (2) described magnetism characteristic good, it is characterized in that: above-mentioned reversible mill adopts the collection bunch formula reversable mill that is made of alienable housing up and down, working roll by at thickness of slab conversion different-diameter in the stage of the operation of rolling of a plurality of passages carries out finally cold rolling with an an above-mentioned collection bunch formula reversable mill.
Description of drawings
Fig. 1 illustrates the relation of work roll diameter and magnetic field intensity;
Fig. 2 illustrates the rolling minimum thickness of slab of leading portion and the relation of magnetic field intensity;
When Fig. 3 is the change work roll diameter, the primary recrystallization of steel plate is gathered the analysis result of tissue;
Fig. 4 is the relation of work roll diameter and minimum thickness of slab that can be rolling;
Fig. 5 is the schematic diagram of 20 segmentation cluster mills of monolithic devices housing and Splittable housing.
The specific embodiment
At first, description is as the result of the test on basis of the present invention.
＜experiment 1 〉
The electromagnetism steel thick plate that will contain percentage by weight and be C:0.005%, Si:3.3%, Mn:0.1%, S:0.07%, Al:0.0282%, N:0.0070% and Sn 0.07% is after 1150 ℃ low temperature slab heating, carry out high temperature rolling, obtain the thick hot rolling paper tinsel plate of 1.8mm.
This hot rolling paper tinsel plate is at 1100 ℃ down after the annealing, cold rolling with 90% compression ratio with the Sen Shi multi-roll mill of 20 rollers, obtain the thickness of slab of 0.18mm.At this moment, in the work roll diameter of in the process of thickness of slab 0.26mm, in the scope of 40～180mm, changing milling train, under the situation of the pass programming of the same terms and passage number of times (5 times), be rolled.In addition, in the thickness of slab stage between second passage, the 3rd passage, four-pass, carry out 200 ℃ * 5 minutes Ageing Treatment.After this, carry out rolling from 0.26mm to 0.18mm with the work roll diameter of 60mm with a passage.
Then, adjust temperature, [N] degenerated for the nitrogenize of 240ppm, apply the magnesia slurries then so that the primary recrystallization grain size is the mode of 23 μ m.With usual way to this paper tinsel plate annealing in process after, the coatings of coating aluminum phosphate+colloidal silica carries out the coating sintering and carries out shape correction annealing, obtains goods.Measure the magnetic field intensity B8 of these goods afterwards.
Fig. 1 illustrates the relation of work roll diameter and B8, and by Fig. 1 obviously as seen, work roll diameter can improve magnetic field intensity in the scope of 95～180mm the time.
＜experiment 2 〉
To with experiment 1 composition identical electromagnetism steel thick plate, carry out high temperature rolling 1150 ℃ of following low temperature slabs heating, make the thick heat of 2.0mm and prolong the paper tinsel plate.This heat is prolonged the paper tinsel plate 1100 ℃ of down annealing, with the Sen Shi multi-roll mill of 20 roll-types carry out compression ratio be 90% cold rolling, be worked into the 0.20mm thickness of slab.At this moment, the work roll diameter of milling train is with i) 100mm and ii) 60mm be two benchmark, be rolled down to thickness of slab in the middle of a plurality of in 0.60mm～0.20mm scope.At this moment, the thickness of slab stage between second passage (1.00mm) and the 3rd passage (0.8mm) is carried out 200 ℃ * 5 minutes Ageing Treatment.After this, to the part more than the 0.22mm, with above-mentioned i) and condition ii) is accordingly, is used alternatingly i) working roll of 60mm and the ii) working roll of 100mm, be rolled down to 0.20mm always.
Then, adjust temperature, [N] degenerated for the nitrogenize of 220ppm, apply the magnesia slurries then so that the primary recrystallization grain size is the mode of 23 μ m.With usual way to this paper tinsel plate annealing in process after, the coatings of coating magnesium phosphate+colloidal silica carries out the coating sintering and carries out shape correction annealing, obtains goods.Measure the magnetic field intensity B8 of these goods afterwards.
When leading portion and back segment passage change work roll diameter was rolled, rolling minimum thickness of slab (i.e. centre thickness of slab) and the relation of magnetic field intensity B8 of leading portion was shown in Fig. 2.The result is, with the major diameter working roll with at aforementioned i) during the leading portion passage that is rolled under the condition, when being rolled down at least the 0.40mm thickness of slab, can guarantee high B8 with the major diameter working roll, promptly use the major diameter working roll and under condition ii), carry out the back segment passage, also can obtain high B8.
As previously mentioned, the magnetic field intensity of one-way electromagnetic steel plate is subjected to the influence of inhibitor and primary recrystallization tissue.In＜experiment 1〉and＜experiment 2 in, because of [N] after the nitrogenize annealing do not change for certain inhibitor, can infer be owing to the variable effect of the primary recrystallization tissue of rolling condition magnetic field intensity.
, choose and＜experiment 1 for this reason〉50mm, 90mm and the corresponding primary recrystallization sample of work roll diameter of 150mm, research primary recrystallization tissue.At thickness of slab is center sampling the carrying out X-ray analysis at 1/5t place, analyzes with SGH method (former gesture etc., Japanese metallography can be reported, the 29th volume, the 7th phase, the 552nd page).
Shown in Figure 3 is the axial intensity (I of ND of this direction of dagger-axe
N) and ∑ 9 counterparties to intensity (I
C∑ 9).Find out the side that the diameter of working roll is big, the I of this direction of dagger-axe (anglec of rotation is 0 °) by Fig. 3
NIntensity increases, when the ND axle is had an appointment 25 ° deviation, and I
NIntensity reduces, and is the I at center with the ND axle
C∑ 9 distributes.Control the diameter of working roll according to the present invention, can obtain the high suitable primary recrystallization tissue of this closeness of dagger-axe of secondary recrystallization.
More than be the result with the low temperature slab heating of AlN inhibitor, the inventor has equally also studied MnS, AlN+MnS (MnSe) inhibitor and the auxiliary high temperature slab heating that is added with Sn, Sb, Cu etc. shown in embodiment 1.Its result, the material that can confirm to contain the composition series of AlN inhibitor all has the improve effect of the major diameter of working roll to magnetic field intensity.On the other hand, do not contain in the composition series of AlN and can not confirm to have that effect.
Known AlN compares with MnS (MnSe) etc., and the intensity of inhibitor is big, and Heat stability is good.Can infer under the situation with such AlN inhibitor, the primary recrystallization tissue that obtains among the present invention can be brought into play magnetic field intensity and improve effect.
About working roll diameter control with to form the mechanism of relation of primary recrystallization tissue not clear at present, following hypothesis is arranged.Known to the little occasion of working roll diameter, the detrusion composition of cold rolling light plate surface portion increases, and after primary recrystallization, (110) face increases, and (111) face reduces.(open country, river etc., iron and steel, 68 (1982), P58).At this moment, the direction group from the rotation around the ND axle of this direction of dagger-axe in (110) face increases, and can infer becomes not preferred wide set tissue in one-way electromagnetic steel plate.Therefore can infer because work roll diameter increases to make to gather and organize narrower (sharp), have the effect that improves magnetic field intensity.In addition, think that the effect that in rolling leading portion passage work roll diameter increases is that surface of steel plate detrusion composition partly is big because big with the angle of nip of the material of working roll when plate is thicker.
Below, the qualification reason and the preferred component scope of the composition of one-way electromagnetic steel plate of the present invention are described.The unit of content is a percentage by weight.
C is used for forming austenitic important element, must be more than 0.025%, be difficult to decarburization at most if cross, on be limited to 0.100%.
Si if very little then resistance reduce, can not get good iron loss characteristic.If cross cold rolling at most difficulty, its content is more than 2.5%, below 4.5% in addition.
Mn is inevitable composition, is limited to 0.03% down.In addition,, be heated to be under the situation of prerequisite, be difficult to obtain the solid solution of MnS, MnSe with the high temperature slab if too much, on be limited to 0.45%.
S, Se should suitably add according to the kind of the inhibitor that uses.They combine with above-mentioned Mn, play the effect of inhibitor, form MnS or MnSe.The composition range of S, Se all should be preferably more than 0.01%, below 0.04% separately and under the situation about share.But MnS, MnSe are fine to separate out in order to make, must the heating of high temperature slab.On the other hand, when carrying out the heating of low temperature slab,, be preferably below 0.015% because fine MnS, MnSe is unnecessary with the nitriding of back operation.Therefore, the scope of S, Se is not limited especially.
Among the present invention, as the inhibitor composition, particularly containing Al, is indispensable to obtaining high magnetic field intensity, so must add to more than certain content.If but too much, the high temperature slab that carries out for solutionization increases heat time heating time, and productivity ratio worsens, so the Al amount is more than 0.007%, below 0.040%.
Be heated to be with the high temperature slab under the situation of prerequisite, owing to must form AlN in final annealing before cold rolling, the content range of N is more than 0.003%, below 0.020%.On the other hand, in low temperature slab heating,, need not in system steel process, to contain N owing to form AlN in the nitrogen treatment after primary recrystallization.Therefore, the scope to N does not add qualification yet.
Except above-mentioned points, in order to improve magnetic, can also suitably add compositions such as Sn, Sb, Cu, Ni, Cr, P, V, B, Bi, Mo, Nb and Ge with well known range.
Below, the condition in the manufacture process is described.
In the present invention, the manufacture process of steel adopts known manufacture method.The ingot or the slab that make are processed as required, heated after meeting size, carry out hot rolling.The slab heating-up temperature is as required in 1100 ℃～1450 ℃ scope.Gas heating stove or induction and energising heating furnace commonly used are adopted in heating usually.Steel band after the hot rolling is worked into final thickness of slab with once cold rolling method after the hot rolled plate annealing or the repeatedly cold-rolling practice that accompanies intermediate annealing.
Under known condition, anneal before cold rolling final.Be heated to be with the high temperature slab under the situation of prerequisite, inadequate AlN is fine during in order to ensure hot rolling separates out, and must anneal before cold rolling final.In addition, be heated to be under the situation of prerequisite, need not to carry out in order to control the final cold rolling preceding annealing that AlN separates out with the low temperature slab.Owing to be used to control the chilling of technology after annealing, the processing distortion of cooling procedure of carbide or solid solution C, it is more effective to be used between heat preservation technology geometric ratio passage of the present invention that carbide separates out Ageing Treatment, even implement final cold rolling preceding annealing, also do not damage effect of the present invention.
Afterwards, steel plate is carried out final cold rolling with reversible rolling.At this moment, in order to obtain high magnetic field intensity, the known so far compression ratio more than 81% of preferred employing.
In the present invention, Ageing Treatment or the middle temperature rolling that carries out in the cold-rolled process is important for improving the magnetism characteristic.Especially, known under the situation of high temperature slab heating, except improving the effect of magnetism characteristic, from preventing that the viewpoint that the wire particulate takes place from also being effective.Thus, in the present invention, shown in embodiment 3, the thickness of slab stage in the operation of rolling is important keeping between 100～350 ℃ more than 1 minute.
One of feature of the present invention is exactly by the working roll diameter increase of cold rolling leading portion passage, can make the one-way electromagnetic steel plate of magnetism characteristic good.As shown in Figure 1, working roll diameter magnetic field intensity when 90mm is following is very poor, and improvement is arranged during greater than 95mm, is tending towards saturated during greater than 120mm substantially.
Therefore, in the present invention, work roll diameter is preferably more than the 120mm more than 95mm.On the other hand, if work roll diameter is excessive, not only effect is saturated, and collection bunch formula milling train is larger, increases installation cost, so be the upper limit with 180mm.In addition, as can be seen from Figure 2, adopt the scope of the major diameter working roll of diameter 95～180mm, because effective in rolling leading portion passage, the thickness of thickness of slab must be machined to and is at least below the 0.40mm, more preferably below the 0.26mm.
On the other hand, in back segment passage rolling, because reduce with working thickness, rolling bounce increases, and is rolling very difficult with the major diameter working roll between diameter 95～180mm.Therefore, goods thickness of slab that must be is as requested selected the diameter of working roll.For this reason, the inventor is with the milling train of work roll diameter changeable type, tentatively obtains the relation of work roll diameter and minimum thickness of slab that can be rolling.As a result, if work roll diameter is D (mm), minimum thickness of slab is T
f(mm), then obtain T
fThe relation of=D/520.This relation is that Stone formula (μ=0.1) exceeds than theoretical formula, thinks that this is that the harmful effect of heat protuberance of causing of hot rolling etc. causes.
As conclusion, can be as shown in Figure 4, the relation of work roll diameter and rolling final thickness of slab is shown.Below, rolling leading portion passage and back segment passage are separated, describe milling method of the present invention.Rolling leading portion passage is at least to thickness of slab 0.40mm, and making work roll diameter is 95～180mm.This moment rolling with hot rolling and midway Ageing Treatment be prerequisite.Then, back segment passage rolling is by being T at working thickness
f(mm) under the situation, with (520 * T
f) the following work roll diameter of mm is rolled, and can stably obtain light sheet.For example under the whole situations of passage with the working roll of same diameter, preferably use under the situation of working roll of 120mm in order to improve magnetic field intensity, because the thickness of slab of 0.23mm is the rolling limit, be difficult to process the goods thickness of slab below the 0.23mm.And, be under the situation of 0.20mm at the goods thickness of slab, can be with the lower limit of leading portion passage of the present invention, promptly the working roll of 95mm carries out the rolling of whole passages, but is difficult to stably obtain high magnetic field intensity.Thus, under the situation below the 0.18mm, promptly use the working roll of 95mm to process, must be rolled, be difficult to obtain high magnetic field intensity with the minor diameter roller of for example 60mm at the goods thickness of slab.Owing to above reason, improving effect and carrying out under the rolling situation of leading portion passage with the working roll more than the 95mm in order to obtain stable magnetic field intensity, must change the working roll of minor diameter in rolling back segment passage into, the goods thickness of slab of 0.23mm is the upper limit of the present invention.
From the viewpoint of the little rolling stability of hot rolling and thickness, be defined as the collection bunch type reversable mill (Sen Shi milling train or NMS milling train etc.) of 6 rollers, 12 rollers, 20 rollers etc.For the Splittable housing, in the suitable work roll diameter of replaceable one-tenth of intermediate rolling stage, carry out the rolling with a milling train, this is the feature of " summary of the invention " part (6) (corresponding to claim 6).Fig. 5 (a) schematically illustrates the monolithic devices housing, and Fig. 5 (b) schematically illustrates the partition type housing.In a), by the diameter of change intermediate calender rolls, can change the diameter of working roll, if the change scope is that 10mm left and right sides Ze Tai is little, and it is big, unrealistic to substitute the operation burden.B) by lower house in the lifting, adjust pitch of holes in, can change work roll diameter.In addition,, in the paper tinsel plate operation of rolling, can exchange working roll rapidly, can not cause production efficiency low because a collection bunch formula milling train does not have choke (choke) in working roll.
Final steel plate after rolling is carried out ungrease treatment, carry out the hold concurrently annealing of primary recrystallization of decarburization afterwards.In the slab heating-up temperature is under the situation of the low temperature slab heating below 1250 ℃, carries out nitrogen treatment between primary recrystallization and secondary recrystallization, and it is effective forming the AlN inhibitor.Method as nitrogen treatment, having the Japan Patent spy to open among the clear 60-179885 etc. disclosed method of carrying out and spy in the processing degenerative process opens among the flat 1-82393 etc. disclosed while transmit the method that band is annealed in the mist of " hydrogen+nitrogen+ammonia ".For stable and well-grown secondary recrystallization crystal grain, must make nitrogen content is more than the 120ppm, to be preferably more than the 150ppm.In addition, open disclosed control among the clear 1-82939 etc., can further improve the magnetism characteristic the primary recrystallization grain size if be used in combination the spy.
Then, coating is the annealing separation agent of main component with the MgO slurries on steel plate, it is rolled into involves in the final mechanical refining of row.The coating of insulating as required afterwards, it is effective carrying out the magnetic domain Subdividing Processing with laser, plasma, mechanical means, etching or other method.
Embodiment 1
To having the electromagnetism steel thick plate of composition shown in the table 1, under the creating conditions shown in the table 2, with the heating of 1350～1400 ℃ high temperature slabs a), b) and c), with 1150～1270 ℃ low temperature slabs heating d), e), carry out hot rolling, the formation hot rolled strip.
To a), c) and f) with accompanying twice cold-rolling practice of intermediate annealing, to b), e) with d) with the once cold rolling method after the hot-roll annealing.The final cold rolling reversible mill of using, compression ratio is 75～92%.Middle thickness of slab and final thickness of slab have been shown in the table.Cold rolling is that the several work roll diameter of usefulness as shown in table 2 are carried out, and up to the 0.3mm thickness of slab, is rolled with 2～5 passages.Select the middle thickness of slab of two the minimum passages in the operation of rolling, carry out 200 ℃ * 5 minutes Ageing Treatment.Then, the working roll with diameter 60mm is rolled down to thickness of slab 0.18mm with a passage.With conventional method to cold-rolled strip decarburizing annealing, wherein to d) and e) retreat in decarburizing annealing and add nitrogenize annealing, to arrive nitrogenize amount shown in the table 2 (after the nitrogenize-nitrogenize before) to the inhibitor reinforcement.Then, apply magnesia, mechanical refining, insulation coating, shape correction and sintering annealing, measure the magnetic field intensity (B8) of the goods steel band that obtains with conventional method.Afterwards, carry out magnetic domain control, measure the iron loss (W17/50) of the goods steel band that obtains afterwards with the method for machinery.As shown in table 2, if can judge that the composition that contains Al in the cold rolling work roll diameter of scope inner control that the present invention stipulates, can obtain the goods of characteristic good.
Table 1
(※ unit is weight % or ppm by weight)
| Grouping | Composition | |||||||||
| C (％) | Si (％) | Mn (％) | S (ppm) | Se (ppm) | Al (ppm) | N (ppm) | Cu (％) | Sn (％) | Sb (ppm) | |
| a) | 0.063 | 3.4 | 0.07 | 50 | 200 | 261 | 79 | 0.05 | - | 230 |
| b) | 0.072 | 3.2 | 0.07 | 240 | - | 267 | 81 | 0.08 | 0.12 | - |
| c) | 0.056 | 3.1 | 0.08 | 240 | - | 15 | 22 | - | - | - |
| d) | 0.055 | 3.3 | 0.10 | 70 | - | 282 | 84 | - | 0.07 | - |
| e) | 0.061 | 3.2 | 0.04 | 130 | - | 255 | 42 | 0.05 | - | - |
| f) | 0.035 | 3.1 | 0.20 | 50 | - | 234 | 105 | 0.50 | 0.07 | - |
Table 2
| Grouping | Process conditions | Magnetic field intensity B8 (T) | Magnetic field intensity W17/50 (W/kg) | Grouping | ||||||
| The slab heating-up temperature (℃) | Hot rolling thickness of slab (mm) | Middle thickness of slab (mm) | Final thickness of slab (mm) | Final compression ratio (%) | Work roll diameter (mm) | Nitrogenize amount (ppm) | ||||
| a) | 1370 | 2.3 | 1.6 | 0.18 | 88.8 | 60 | 1.892 | 0.824 | Comparative example | |
| 100 | 1.924 | 0.673 | Embodiment | |||||||
| 150 | 1.928 | 0.664 | Embodiment | |||||||
| b) | 1400 | 1.8 | - | 0.18 | 90.0 | 60 | - | 1.888 | 0.822 | Comparative example |
| 100 | 1.930 | 0.662 | Embodiment | |||||||
| 130 | 1.931 | 0.651 | Embodiment | |||||||
| c) | 1350 | 2.2 | 0.7 | 0.18 | 74.3 | 60 | - | 1.855 | 0.901 | Comparative example |
| 100 | 1.862 | 0.900 | Comparative example | |||||||
| 150 | 1.863 | 0.898 | Comparative example | |||||||
| d) | 1150 | 2.0 | - | 0.18 | 91.0 | 60 | 130 | 1.898 | 0.878 | Comparative example |
| 100 | 1.925 | 0.657 | Embodiment | |||||||
| 150 | 1.927 | 0.647 | Embodiment | |||||||
| e) | 1270 | 1.8 | - | 0.18 | 90.0 | 60 | 110 | 1.899 | 0.792 | Comparative example |
| 100 | 1.929 | 0.651 | Embodiment | |||||||
| 150 | 1.930 | 0.650 | Embodiment | |||||||
| f) | 1290 | 2.0 | 1.0 | 0.18 | 82.0 | 60 | - | 1.870 | 0.891 | Comparative example |
| 100 | 1.912 | 0.680 | Embodiment | |||||||
| 150 | 1.922 | 0.677 | Embodiment | |||||||
Embodiment 2
His-and-hers watches 1 a) and table 2 a) shown in the annealed material of middle thickness of slab of 1.6mm, as shown in table 3 with reversable mill, carry out 10 times of working roll of diameter 120mm and 60mm and make up, be cold rolled to final thickness of slab.Timeliness between passage is for to carry out 200 ℃ * 5 minutes processing in the thickness of slab stage shown in the table 3.With conventional method cold-rolled strip is carried out decarburizing annealing, magnesia coating, mechanical refining, insulation coating, shape correction and sintering annealing, measure the magnetic field intensity (B8) of resulting product steel band afterwards., with the method for machinery carry out magnetic domain control, measure the iron loss (W17/50) of resulting product steel band afterwards thereafter.As shown in table 3, can judge by in rolling leading portion passage, be rolled down at least with the major diameter working roll of 120mm that thickness of slab is below the 0.4mm, can obtain the good goods of magnetic field intensity.
Table 3
| Condition | The cold rolling pass design | Magnetic field intensity B8 (T) | Iron loss W17/50 (W/kg) | Remarks | ||||||
| Thickness of slab (mm) | 1.3 | 1.0 | 0.7 | 0.4 | 0.3 | 0.2 | ||||
| 1 | Work roll diameter (mm) | l20 | 60 | 1.931 | 0.681 | Embodiment | ||||
| Ageing Treatment | ○ | ○ | ○ | ○ | ○ | - | ||||
| 2 | Work roll diameter (mm) | 120 | 60 | 1.929 | 0.693 | Embodiment | ||||
| Time (branch) | ○ | ○ | ○ | ○ | - | - | ||||
| 1 | Work roll diameter (mm) | 120 | 60 | 1.908 | 0.883 | Comparative example | ||||
| Time (branch) | ○ | ○ | ○ | - | - | - | ||||
| 4 | Work roll diameter (mm) | 120 | 60 | 1.782 | 1.112 | Comparative example | ||||
| Time (branch) | ○ | ○ | - | - | - | - | ||||
| 5 | Work roll diameter (mm) | 120 | 60 | 1.432 | Can not measure (particulate) | Comparative example | ||||
| Time (branch) | ○ | - | - | - | - | - | ||||
| 6 | Work roll diameter (mm) | 60 | 1.421 | Can not measure (particulate) | Comparative example | |||||
| Time (branch) | - | - | - | - | - | - | ||||
| 7 | Work roll diameter (mm) | 120 | 60 | 1.911 | 0.845 | Comparative example | ||||
| Time (branch) | ○ | ○ | ○ | ○ | ○ | - | ||||
| 8 | Work roll diameter (mm) | 120 | 60 | 1.905 | 0.902 | Comparative example | ||||
| Time (branch) | ○ | ○ | ○ | ○ | ○ | - | ||||
| 9 | Work roll diameter (mm) | 120 | 60 | 1.492 | Can not measure (particulate) | Comparative example | ||||
| Ageing Treatment | - | - | - | - | - | - | ||||
| 10 | Work roll diameter (mm) | 120 | 60 | 1.926 | 0.705 | Embodiment | ||||
| Ageing Treatment | - | - | ○ | - | - | - | ||||
Embodiment 3
The annealed material of the middle thickness of slab of the 1.6mm shown in (a) of his-and-hers watches 1 and (a) of table 2, reversable mill with work roll diameter 165mm, carry out under 12 heat-retaining conditions between passage as shown in table 4, be rolled down to 0.3mm after, be cold rolled to final thickness of slab 0.15mm with the working roll of 50mm.With conventional method cold-rolled strip is carried out decarburizing annealing, magnesia coating, mechanical refining, insulation coating, shape correction and sintering annealing, measure the magnetic field intensity (B8) of resulting product steel band afterwards., with corroding method carry out magnetic domain control, measure the iron loss (W17/50) of resulting product steel band afterwards thereafter.As shown in table 4, by the thickness of slab stage in the operation of rolling under 100～350 ℃ the temperature range insulation more than 1 minute, can obtain the good goods of magnetic field intensity.
Table 4
| Condition | The cold rolling pass design | Magnetic field intensity B8 (T) | Iron loss W17/50 (W/kg) | Remarks | |||||
| Thickness of slab (mm) | 1.2 | 0.9 | 0.6 | 0.3 | 0.15 | ||||
| 1 | Temperature (℃) | - | - | - | - | - | 1.477 | Can not measure (particulate) | Comparative example |
| Time (branch) | - | - | - | - | - | ||||
| 2 | Temperature (℃) | - | - | 80 | - | - | 1.605 | Can not measure (particulate) | ″ |
| Time (branch) | - | - | 5 | - | - | ||||
| 3 | Temperature (℃) | - | - | 100 | - | - | 1.906 | 0.623 | Embodiment |
| Time (branch) | - | - | 5 | - | - | ||||
| 4 | Temperature (℃) | - | - | 200 | - | - | 1.915 | 0.620 | Embodiment |
| Time (branch) | - | - | 5 | - | - | ||||
| 5 | Temperature (℃) | - | - | 300 | - | - | 1.919 | 0.611 | Embodiment |
| Time (branch) | - | - | 5 | - | - | ||||
| 6 | Temperature (℃) | - | - | 400 | - | - | 1.895 | 0.805 | Comparative example |
| Time (branch) | - | - | 5 | - | - | ||||
| 7 | Temperature (℃) | - | 200 | - | - | - | 1.484 | Can not measure (particulate) | Comparative example |
| Time (branch) | - | 0.5 | - | - | - | ||||
| 8 | Temperature (℃) | - | - | 300 | - | - | 1.522 | Can not measure (particulate) | ″ |
| Time (branch) | - | - | 0.5 | - | - | ||||
| 9 | Temperature (℃) | - | - | 200 | - | - | 1.910 | 0.625 | Embodiment |
| Time (branch) | - | - | 1 | - | - | ||||
| 10 | Temperature (℃) | - | - | 200 | - | - | 1.917 | 0.615 | Embodiment |
| Time (branch) | - | - | 5 | - | - | ||||
| 11 | Temperature (℃) | - | 200 | 200 | - | - | 1.925 | 0.598 | Embodiment |
| Time (branch) | - | 5 | 5 | - | - | ||||
| 12 | Temperature (℃) | - | 200 | 200 | 150 | - | 1.930 | 0.580 | Embodiment |
| Time (branch) | - | 5 | 5 | 5 | - | ||||
Claims (6)
1. the manufacture method of the one-way electromagnetic steel plate of a magnetism characteristic good, wherein, to containing percentage by weight C:0.025～0.10%, Si:2.5～4.5%, the electromagnetism steel thick plate of Al:0.007～0.040% carries out after the hot rolling, hot rolled plate is annealed, implement once cold rolling or be interspersed with above cold rolling of twice of intermediate annealing, carry out primary recrystallization annealing afterwards, carry out secondary recrystallization annealing then again, the method is characterized in that: with the working roll diameter is that the reversible mill of 95～180mm carries out finally cold rolling, and the thickness of slab in the operation of rolling changes the diameter of working roll in the stage, make the work roll diameter of leading portion passage bigger.
2. the manufacture method of the one-way electromagnetic steel plate of magnetism characteristic good as claimed in claim 1, it is characterized in that: carry out finally cold rolling with reversible mill, and the working roll that is 95～180mm as final cold rolling leading portion passage diameter is cold rolled to the middle thickness of slab that is at least below the 0.40mm, then change the diameter of working roll, with diameter D≤T
fThe working roll of * 520 (mm) carries out from middle thickness of slab to final thickness of slab T
f(mm) cold rolling.
3. the manufacture method of the one-way electromagnetic steel plate of magnetism characteristic good as claimed in claim 1 or 2, it is characterized in that: at least one in the final cold rolling passage in above-mentioned cold-rolled process, the steel plate band is kept time more than at least 1 minute in 100～350 ℃ temperature range.
4. the manufacture method of the one-way electromagnetic steel plate of magnetism characteristic good as claimed in claim 1 or 2 is characterized in that: it is 0.03～0.45% Mn that described electromagnetism steel thick plate contains percentage by weight.
5. the manufacture method of the one-way electromagnetic steel plate of magnetism characteristic good as claimed in claim 1 or 2 is characterized in that: the goods thickness of slab is below the 0.23mm.
6. the manufacture method of the one-way electromagnetic steel plate of magnetism characteristic good as claimed in claim 1 or 2, it is characterized in that: above-mentioned reversable mill adopts the collection bunch formula reversable mill that is made of alienable housing up and down, working roll by at thickness of slab conversion different-diameter in the stage of the operation of rolling of a plurality of passages carries out finally cold rolling with an an above-mentioned collection bunch formula reversable mill.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP319837/2000 | 2000-10-19 | ||
| JP2000319837A JP3492993B2 (en) | 2000-10-19 | 2000-10-19 | Manufacturing method of high magnetic flux density thin unidirectional magnetic steel sheet |
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| CN1349862A CN1349862A (en) | 2002-05-22 |
| CN1261241C true CN1261241C (en) | 2006-06-28 |
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|---|---|---|---|
| CNB011120185A Expired - Fee Related CN1261241C (en) | 2000-10-19 | 2001-03-27 | Production method of unidirectional electromagnetic steel plate with high magnetic intensity |
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| Country | Link |
|---|---|
| JP (1) | JP3492993B2 (en) |
| KR (1) | KR100430601B1 (en) |
| CN (1) | CN1261241C (en) |
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| JP4258349B2 (en) * | 2002-10-29 | 2009-04-30 | Ｊｆｅスチール株式会社 | Method for producing grain-oriented electrical steel sheet |
| PL2140949T3 (en) * | 2007-04-24 | 2017-10-31 | Nippon Steel & Sumitomo Metal Corp | Process for producing unidirectionally grain oriented electromagnetic steel sheet |
| CN104438325B (en) * | 2014-10-08 | 2017-01-11 | 武汉科技大学 | Rolling method of ultra-thin silicon steel sheet |
| CN116460139B (en) * | 2023-03-23 | 2024-01-02 | 首钢智新迁安电磁材料有限公司 | Ultrathin high-magnetic-induction oriented silicon steel and rolling method thereof |
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2000
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| JP3492993B2 (en) | 2004-02-03 |
| KR20020033021A (en) | 2002-05-04 |
| JP2002129234A (en) | 2002-05-09 |
| KR100430601B1 (en) | 2004-05-10 |
| CN1349862A (en) | 2002-05-22 |
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