CN1203635A - Process for producing non-oriented electromagnetic steel sheet having high magnetic flux density and low iron loss - Google Patents
Process for producing non-oriented electromagnetic steel sheet having high magnetic flux density and low iron loss Download PDFInfo
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- CN1203635A CN1203635A CN96198854A CN96198854A CN1203635A CN 1203635 A CN1203635 A CN 1203635A CN 96198854 A CN96198854 A CN 96198854A CN 96198854 A CN96198854 A CN 96198854A CN 1203635 A CN1203635 A CN 1203635A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0085—Joining ends of material to continuous strip, bar or sheet
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/20—Slip
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
Abstract
A process for producing non-oriented electrical steel sheets, by hot rolling a slab comprising on the weight basis 1.00% < Si <= 7.0%, 0.10% <= Mn <= 1.50%, C <= 0.0050%, N <= 0.0050%, and S <= 0.0050% with the balance consisting of Fe and unavoidable impurities to prepare a hot rolled sheet, optionally annealing the hot rolled sheet, either subjecting the sheet to cold rolling once or at least twice with intermediate annealing conducted between the cold rolling steps and then finish annealing, or subjecting the sheet to cold rolling once or at least twice with intermediate annealing conducted between the cold rolling steps and then finish annealing followed by skin pass rolling, characterized in that the finishing in the step of finish hot rolling is performed under either an average coefficient of friction between the hot rolling roll and the steel sheet of not more than 0.25, or an average coefficient of friction between the hot rolling roll and the steel sheet of not more than 0.25 and a maximum strain rate in at least one pass of not less than 150<-1>. At the time of rough rolling, a sheet bar may be joined to continuously conduct finish rolling.
Description
The present invention relates to the manufacture method of following non-oriented electromagnetic steel sheet having, this steel plate is as the core material of electrical equipment, and it has the excellent magnetic of high flux density low iron loss.
In recent years; at electrical equipment; particularly with the rotating equipment of non-oriented electromagnetic steel sheet having as its core material; and in the field such as medium and small transformer; in the motion of global environment protections such as the electric power in the world, energy-conservation and flowing gas restriction; extensively carrying out the motion of raising the efficiency apace,, using producer that the requirement of the electro-magnetic steel plate of low iron loss is just increased like this so the mode of the core loss value by reducing the power loss when using is at least raised the efficiency.In rotating equipment, in order to obtain identical output, must improve the action magneticflux-density by the size that reduces iron core, just need to adopt the non-oriented electromagnetic steel sheet having of higher flux density for this reason.In the manner described above, because reducing of the size of rotating equipment is relevant with alleviating of the weight moving body that is equiped with this rotating equipment as itself, automobile, electric car etc., can obtain also the saving advantages associated of the energy that consumed with these moving bodys itself like this.So using producer's strong request to adopt the non-oriented electromagnetic steel sheet having of low iron loss high magnetic flux density recently.
In addition, in the modern times in the big competition epoch of stepping into the world, actual situation is, the requirement of using producer that the non-oriented electromagnetic steel sheet having cost is reduced is an intensive very, otherwise the non-oriented electromagnetic steel sheet having of excellent magnetic is at least selected by use producer when price is identical.
But with regard to non-oriented electromagnetic steel sheet having, in the past, the mode that reduces iron loss is general to adopt following method, and this method increases and viewpoint that the eddy current losses that produces reduces from resistance, employing be to improve Si, or the mode of the content of Al etc.Yet this method but has the problem that can not avoid magneticflux-density to reduce on the contrary.In order to overcome above-mentioned problem, people adopt following method, and this method is improved magneticflux-density by the mode that strengthens hot-rolled sheet crystallization particle diameter.
In the past, with regard to the higher non-oriented electromagnetic steel sheet having of Si content, the growth of the crystal structure after the smart hot rolling is inadequate, for the material of high flux density low iron loss is provided, after finishing, smart hot rolling must carry out anneal to hot-rolled sheet, to strengthen crystal structure by some method.But, even can be, improve under the situation of magnetic of certain product by hot-rolled sheet is carried out anneal, still can not satisfy fully and use the requirement of producer above-mentioned high flux density low iron loss material.
At the problems referred to above, with regard to Si content at 2.5～4.0% high Si steel, following technology is disclosed in the clear 59-74224 document of TOHKEMY, this technology is in the once cold rolling method, at impurity S≤15ppm, O≤20ppm, increase following regulation in the restriction of N≤25ppm, this regulation refers to limit hot-rolled sheet anneal condition, and stipulates that cold rolling calendering rate is more than 65%, following technology is disclosed in clear-No. 74225 documents of TOHKEMY, this technology is not only to add S≤15ppm in twice cold-rolling practice, O≤20ppm, the regulation of N≤25ppm, and regulation process annealing treatment condition, and stipulate that twice cold rolling calendering rate is more than 70%.
But, according to these applications formerly, even, improve under the situation of iron loss in the high-purity technology that turns to the center that adopts with steel, so far but still inadequate, the high Si of the raising of unresolved magneticflux-density be the peculiar problem of non-oriented electromagnetic steel sheet having.
In addition, as the cold rolling preceding crystal structure that strengthens non-oriented electromagnetic steel sheet having with lower cost, thereby improve the technology of magneticflux-density, the clear 54-76422 document of TOHKEMY discloses a kind of annealing method own, this method is under 700～1000 ℃ the high temperature hot-rolled sheet after the smart hot rolling to be reeled, by the heat that coiled material kept it is carried out anneal, the manufacture method of the non-oriented electromagnetic steel sheet having of following high flux density low iron loss is disclosed in the clear 62-61644 document of TOHKEMY in addition, this method makes the hot rolling outlet temperature more than 1000 ℃, set no water injection time, promptly attempted before reeling on the discharging roller-way, in hot rolling microstructure, obtain recrystallize and particulate growth.
But, even this technology under the situation of the growth of the crystalline particle of seeking hot rolling microstructure, so far but still inadequate, the high Si of the raising of unresolved magneticflux-density be the distinctive problem of non-oriented electromagnetic steel sheet having.
In addition, technology as the magnetic of the high-grade non-oriented electromagnetic steel sheet having of the high slowly Si set member of carrying out that improves recrystallize and particle growth by control hot rolling mode, a kind of technology is disclosed in clear No. 5974222 documents of TOHKEMY, this technology makes the draft at the last frame of smart hot rolling place more than 20%, and the coiling temperature that makes hot-rolled sheet is more than 700 ℃.Should be by improving last frame place draft that the mode that the coiling temperature is risen promotes the recrystallize and the particle growth of the hot rolling microstructure after hot rolling finishes in the purpose of first to file, consequently, magnetic is improved.But the higher occasion of Si content in steel plate, particle growth after this is inadequate, still inadequate, the high Si of the raising of unresolved magneticflux-density is the peculiar problem of non-oriented electromagnetic steel sheet having so far.
In the manner described above, existing technology is failed so far to be manufactured on and is fully improved magneticflux-density in the higher high-grade non-oriented electromagnetic steel sheet having of Si content, and the non-oriented electromagnetic steel sheet having that iron loss is lower can not satisfy and use the requirement of producer to non-oriented electromagnetic steel sheet having.
The design of being adopted in the present invention and the prior art is different, average friction coefficient when technical conceive of the present invention is by reduction control hot rolling, form recovery organization wittingly, machining deformation speed by to smart hot rolling the time is suitably controlled simultaneously, improve near the set tissue in steel plate top layer, consequently, the actual particle size of hot rolling crystal structure is strengthened, cold rolling preceding set tissue improves.Thus, the object of the present invention is to provide the manufacture method of the higher high-grade non-oriented electromagnetic steel sheet having of a kind of Si content, it is difficult that this method can obtain for prior art, but the low non-oriented electromagnetic steel sheet having of the high iron loss of magneticflux-density.
Main technical schemes of the present invention is:
(1) a kind of magneticflux-density is higher, the manufacture method of the non-oriented electromagnetic steel sheet having that iron loss is lower, and this method comprises the steps:
Adopt following plate, this plate contains in steel by weight percentage:
1.00％＜Si≤7.00％
0.10％≤Mn≤1.50％
C≤0.0050％
N≤0.0050％
S≤0.0050％
Its remainder is made of Fe and unavoidable impurities, and this plate is carried out hot rolling, forms hot-rolled sheet, and it is carried out 1 time or accompany the cold rolling step more than 2 times of process annealing treatment step, then carries out smart anneal;
Hot-rolling roll when it is characterized in that smart hot rolling and the average friction coefficient between the steel plate are below 0.25.
(2) a kind of magneticflux-density is higher, the manufacture method of the non-oriented electromagnetic steel sheet having that iron loss is lower, and this method comprises the steps:
Adopt following plate, this plate contains in steel by weight percentage:
1.00％＜Si≤7.00％
0.10％≤Mn≤1.50％
C≤0.0050％
N≤0.0050％
S≤0.0050％
Its remainder is made of Fe and unavoidable impurities, and this plate is carried out hot rolling, forms hot-rolled sheet, and it is carried out 1 time or accompany the cold rolling step more than 2 times of process annealing treatment step, then carries out smart anneal;
It is characterized in that:
Hot-rolling roll during the essence hot rolling and the average friction coefficient between the steel plate are below 0.25;
With regard to smart hot rolling, the Deformation velocity of at least 1 mill train is at 150s
-1More than.
(3) according to above-mentioned (1) or the manufacture method of the non-oriented electromagnetic steel sheet having of (2) described high flux density low iron loss, it is characterized in that in steel by weight percentage, also contain Al, its content is: 0.10%≤Al≤2.00%.
(4) according to the manufacture method of the non-oriented electromagnetic steel sheet having of above-mentioned (1)～(3) described high flux density low iron loss, it is characterized in that after smart hot rolling finishes, before cold rolling, according in 850～1150 ℃ temperature range, the mode that the continuous annealing in 20 seconds～5 minutes time range is handled is carried out the hot-rolled sheet anneal.
(5) according to the manufacture method of the non-oriented electromagnetic steel sheet having of above-mentioned (1)～(3) described high flux density low iron loss, it is characterized in that after smart hot rolling finishes, before cold rolling, according in 750～850 ℃ temperature range, the pack annealing processing mode in 5 minutes～30 hours time range is carried out the hot-rolled sheet anneal.
(6) according to the manufacture method of the non-oriented electromagnetic steel sheet having of above-mentioned (1)～(3) described high flux density low iron loss, it is characterized in that after smart hot rolling finishes, in 750～1000 ℃ temperature range, coiled material is curled, in 5 minutes～5 hours time range, the heat of the maintenance by coiled material itself carries out anneal to itself.
(7) manufacture method of the non-oriented electromagnetic steel sheet having of basis (1)～(a 3) described high flux density low iron loss, it is characterized in that smart relatively hot rolling end temp T (℃), during the time t (second) that meets the following formula after hot rolling finishes, do not carry out water filling, the coiling coiled material, this formula is:
950≤T (℃)≤1150 ... formula (1)
9.6-8 * 10
-3T≤t (second)≤15.6-8 * 10
-3T ... formula (2)
(8) according to the manufacture method of the non-oriented electromagnetic steel sheet having of (1)～(7) described high flux density low iron loss, it is characterized in that after carrying out smart anneal, also carry out the step of 2～20% skin-pass.
(9) manufacture method of the non-oriented electromagnetic steel sheet having of basis (1)～(a 8) described high flux density low iron loss, it is characterized in that when smart hot rolling, will be as lubricant, by volume the lubricating oil of per-cent meter in 0.5～20% scope is sneaked in the hot-rolling roll water coolant at emulsion state.
(10) manufacture method of the non-oriented electromagnetic steel sheet having of basis (1)～(a 9) described high flux density low iron loss is characterized in that before smart hot rolling, with thin slab after the roughing and the welding of last thin slab, this thin slab was carried out smart hot rolling continuously.
Below the present invention is specifically described.
Fig. 1 is the figure of the relation between expression Si content and the magneticflux-density;
The average friction coefficient of Fig. 2 during and the figure of the relation between the magneticflux-density of product for the smart hot rolling of expression;
The figure of the relation between the Deformation velocity at the last frame place of Fig. 3 during and the magneticflux-density of product for the smart hot rolling of expression;
The figure of the relation between the magneticflux-density of average friction coefficient, maximum distortion speed and the product of all breaker rolls of Fig. 4 during for the smart hot rolling of expression;
Fig. 5 during for the smart hot rolling of expression average friction coefficient and carry out the figure of the relation between the magneticflux-density of product of hot-rolled sheet anneal;
The figure of the relation between the magneticflux-density of average friction coefficient, maximum distortion speed and the product of all breaker rolls when Fig. 6 adopts smart hot rolling in the hot-rolled sheet annealing treating process of continuous annealing processing mode for expression;
Fig. 7 adopts the figure of the relation between the magneticflux-density of hot-rolled sheet anneal time of continuous annealing processing mode and product for expression;
Fig. 8 adopts the figure of the relation between the magneticflux-density of the hot-rolled sheet anneal temperature of continuous annealing processing mode and product for expression;
Fig. 9 during for the smart hot rolling of expression average friction coefficient and carry out the figure of the relation between the magneticflux-density of product of anneal own;
Figure 10 during for smart hot rolling average friction coefficient and carry out hot rolling after the figure of relation between the magneticflux-density of product of no water filling of certain hour;
Figure 11 is the microphotograph of expression because of the variation of the different hot-rolled sheet crystal structures that cause of frictional coefficient, and Figure 11 A, C be corresponding to the present invention, Figure 11 B, and D is corresponding to comparative example;
Figure 12 is for representing that Figure 12 A is corresponding to the present invention because of the microphotograph of the variation of the crystal structure after the different hot-rolled sheet anneal that cause of frictional coefficient, and Figure 12 B is corresponding to comparative example.
The discoveries such as the inventor, result as the ad hoc analysis of the boundary of the control hot rolling of carrying out to break the higher non-oriented electromagnetic steel sheet having of above-mentioned Si content, pass through following manner, the formation of the fine grained tissue that the recrystallization on inhibition hot rolled plate top layer produces, in the whole thickness range of steel plate, obtain thick regenerating tissues, this mode is: at the Si that contains 1.0～7.0%, 0.1～1.5% Mn, as required in the steel of 0.10～2.0% Al, hot-rolling roll when making smart hot rolling and the average friction coefficient between the steel plate are below 0.25, carry out hot rolling, or except set average friction coefficient for above-mentioned hot rolling, the machining deformation speed during also to hot rolling is suitably controlled.
In addition, find following brand-new viewpoint, namely above-mentioned regenerating tissues refers to the tissue greater than the regenerating tissues of seeing at the hot rolled plate central core that obtains by the higher hot-rolling method of existing coefficient of friction, consequently, in the scope of whole thickness of slab, obtain in fact thick crystalline structure.
In addition, also find following brand-new viewpoint, namely pass through following manner, promote the growth of the crystalline particle of following occasion, when this occasion refers to the hot rolled plate annealing in process, when replacing the hot rolled plate annealing in process as the annealing in process of purpose own, or after the high temperature process and set certain during without water injection time, this following manner is: in the technique take every kind of hot rolled plate annealing in process as prerequisite, the own annealing treating process that adopts high temperature to reel, or in high temperature process and the technique of setting without water injection time, hot-rolling roll when all making smart hot rolling and the average friction coefficient between the steel plate are below 0.25, carry out hot rolling, or except set average friction coefficient for above-mentioned hot rolling, the machining deformation speed during also to hot rolling is controlled suitably.
In the manner described above, technical conceive of the present invention is according to following drawing with the diverse technical conceive of prior art, this technical conceive refers to the coefficient of friction when reducing smart hot rolling, promote energetically the formation of regenerating tissues, and the deformation velocity when making smart hot rolling remains on the above mode of certain value, further promotes its effect.
In addition, find that also the following scheme of carrying out lubrication and rolling of the present invention is effectively, this scheme refers to a certain amount of above lubricating oil is sneaked in the roll cooling water of hot-rolling mill, allows it that work roll is sprayed.
Also have, find that also following manner is that effectively this mode is: in order stably to carry out the smart hot rolling of low-friction coefficient of the present invention, the sheet billet after the roughing is connected with last sheet billet, carries out continuously smart hot rolling.
The present invention is successfully aspect following, this aspect refer to since the hot rolled plate that the manufacture method of the non-oriented electromagnetic steel sheet having by above-mentioned high flux density low iron loss is obtained as original material, can make following non-oriented electromagnetic steel sheet having like this, the magnetic flux density of the product after the smart hot rolling in this steel plate is very high, iron loss good (core loss value is lower).
At first composition is described, adding Si is in order to increase the resistance of itself, to reduce eddy current loss, improving core loss value. When Si content 1.0% when following, even the coefficient of friction when reducing smart hot rolling, in the situation that deformation velocity is controlled, the raising effect of magnetic flux density is still less. In addition, owing to can not fully obtain to consist of the necessary resistance of low iron loss non-oriented electromagnetic steel sheet having of the object of the invention own, must add 1.0% the amount that surpasses like this. Because when Si content surpassed 7.0%, remarkable increase was split on the limit when rolling, rolling difficulty, Si content must be below 7.0% like this.
Investigate for the dependence that magnetic of the present invention is improved between effect and the Si content, carried out following test. The steel that melting has the composition of the different non-oriented electromagnetic steel sheet having of Si content carries out smart hot rolling to it.
As the content of the composition except Si, Mn:0.1～0.2%, below the sol-Al:20ppm, C, N, S are controlled at respectively in the scope of 10～20ppm, according to the mode that the relation between effect of the present invention and the Si content is clearer and more definite composition of steel are adjusted.
At first, as example of the present invention, by percentage meter by volume, the lubricating oil content in the roll cooling water is adjusted to 2.5% mode, the average friction coefficient when making smart hot rolling reaches 0.21. Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value. In addition, the deformation velocity at the last frame place of smart hot-rolling mill is 280s-1。
Also have, as a comparative example, steel to various compositions, by volume the percentage meter adjusts to 0.3% with the lubricating oil content in the roll cooling water, average friction coefficient when making smart hot rolling is 0.33, according to maximum distortion speed in the end the mode at frame place adjust rolling shedule, this velocity amplitude is controlled at 120s-1。
Smart hot rolling final temperature all remains on 860 ℃, and any hot rolled plate all is processed into the thickness of 2.5mm.
These material are carried out pickling, and cold rolling, the thickness of formation 0.50mm after carrying out ungrease treatment, carries out annealing in process by continuous annealing furnace to it, and cutting goes out the iron loss test portion, measures magnetic characteristic.
The product magnetic flux density that table 1 expression draws according to the result of above-mentioned test and the dependence between the Si content. Know, even in lower Si zone, confirm to have small magnetic to improve effect, but along with the increasing of Si content, magnetic of the present invention is improved effect and increased, and Si content is 1% when above, above-mentioned effect is remarkable. The prescribed limit of Si content of the present invention is determined more than 1.0%, be because this content except the own resistance that can guarantee steel plate described above, it is to draw according to the mode that hot-rolled condition of the present invention reaches higher efficacy in addition.
Identical with Si, Al also has the own resistance that strengthens steel plate, and reduces the effect of eddy current loss. In order to obtain to consist of the low iron loss high magnetic flux density non-oriented electromagnetic steel sheet having of the object of the invention, must add the amount more than 0.1%. Because when Al content surpassed 2.0%, magnetic flux density just reduced, cost is also higher, and Al content is below 2.0% like this.
In addition, even the Al content in steel does not reach in 0.10% the situation, effect of the present invention can not be subject to any loss.
With Al, Si is identical, and Mn also has the own resistance that strengthens steel plate, and reduces the effect of eddy current loss. To achieve these goals, Mn content must be more than 0.10%. Because according to the present invention, relative prior art can be provided, good high magnetic flux density, and the non-oriented electromagnetic steel sheet having of low iron loss, the magnetic of certain, the necessary degree of so relative requirement and the application scenario of resistivity, general Mn content is just enough in 0.1～1.0% scope. But in order to be fit to require simultaneously better magnetic and resistivity, particularly high magnetic flux density and the application scenario of low iron loss, preferably the addition of Mn is in 1.0～1.5% scope. Because when Mn content surpasses 1.5%, the distortion opposing strength increase during hot rolling, hot rolling just difficult, the crystalline structure after the hot rolling produces granular easily in addition, the magnetic of product is understood variation, Mn content must be below 1.5% like this.
Also have, from the intensity of the sheet billet connecting portion of guaranteeing the high temperature before the smart hot rolling, the Mn addition also is very important. Its reason is, is present in the thermal embrittlement of the sheet billet connecting portion that causes in the crystal grain border in order to prevent low-melting sulfide, the weight concentration ratio between Mn and the S, and namely the value of Mn/S must be more than 20. Because according to composition range given to this invention, Mn content is more than 0.1%, S content can guarantee like this that below 0.005% the value of Mn/S more than 20, according to this viewpoint, can not have problems.
In addition, for the raising of the characteristic of the machinery of realizing product, the raising of magnetic, resistance to rust, or other purpose, even in steel, contain P, B, Ni, Cr, Sb, Sn, a kind of among the Cu, or in the situation more than two kinds, effect of the present invention still can not suffer damage.
Since when C content surpasses 0.0050%, since the timeliness effect of the magnetic in the use procedure, iron loss situation variation, and the energy loss during use increases, and C content must be controlled at below 0.0050% like this.
S, solid solution can occur in the plate heating process in hot-rolled step in N partly again, forms MnS sulfides, the nitride such as AlN in course of hot rolling. Owing to because there being these compositions, can hinder the germination of hot rolling microstructure, the crystalline particle growth when hindering smart annealing in process in addition makes iron loss situation variation, must make like this S content below 0.0050%, makes N content below 0.0050%.
The below is described technique of the present invention.
The rolling of smart hot rolling can be below 0.25 with mean values in the friction co-efficient value between roll and the steel plate, smart all breaker rolls of hot rolling. When surpassing 0.25, its effect is good not, and the product magnetic flux density reduces. With regard to the lower limit of coefficient of friction, needn't set especially, but owing to be worth when too small when this, in the operation of rolling, can produce slip, stably limp, therefore, best above-mentioned value is more than 0.05.
Under emulsion state, sneak into by volume percentage meter, the lubricating oil of its content in 0.5～20% scope, this lubricating oil is sneaked in the roll cooling water when smart hot rolling. When the content of the lubricating oil in the roll cooling water does not reach 0.5%, can not obtain above-mentioned effect since when this content 20% when above, above-mentioned effect is saturated, is uneconomic, above-mentioned like this content is less than 20%. In order to prevent that lubricating oil from separating with cooling water, as required, also can add interfacial agent. In addition, also can be by lubricating oil and cooling water be sent into by the pipeline of other system, until near the roll place, simultaneously by identical nozzle with lubricating oil and cooling water towards rolling mode of spraying with roll, formation emulsion admixture.
The hot-rolling oil that this lubricating oil can adopt known smart hot-rolling mill to use. An example of the hot-rolling oil that this essence hot-rolling mill is used can be キ ユ-De-Le 5149, キ ユ-De-Le 0B068, キ ユ-De-Le 4B313 (being the grease trade name).
According to the present invention, with low friction ratio, or low friction ratio and the high deformation velocity occasion of carrying out smart hot rolling, when the engaging-in smart hot-rolling mill of sheet billet, can produce following situation, it is engaging-in bad that sheet billet namely occurs, or produce between roll and the steel plate in smart course of hot rolling and slide, the rolling life-span with roll significantly shortens, and produces darker rolling scar on the steel plate top layer. Like this, solve low friction ratio, or the problem in the smart hot rolling of low friction ratio and high deformation velocity, stably to carry out the method for operation effective especially for following situation, this situation refers to: the sheet billet after the roughing was connected with last sheet billet before carrying out smart hot rolling, continuously this sheet billet was carried out smart hot rolling.
As the method that last sheet billet is connected with follow-up sheet billet, the front end that includes the rearward end of last sheet billet and follow-up sheet billet flushes, this section of flushing is exerted pressure and realize the method for crimping, when the section of flushing is exerted pressure, carry out the method for laser weld, or when the section of flushing is carried out eddy-current heating, carry out method of crimping etc.
According to the present invention, because in smart hot rolling, the deformation velocity of at least 1 mill train is at 150s-1More than, can further improve magnetic like this. Needn't set especially the upper limit of deformation velocity. This is because the shape of relatively hot milling equipment ability and hot rolled plate is controlled, the upper limit of deformation velocity is determined by itself, namely, deformation velocity is determined by mill speed, hot-rolling roll diameter, drafts, when mill speed, when drafts is larger, deformation velocity strengthens, but the shape of hot rolled steel plate control difficulty. Because non-oriented electromagnetic steel sheet having provides use in stacked mode, then for its shape, must carry out strict control, aspect the deformation velocity increase, nature will have boundary thus. According to this viewpoint, the boundary of deformation velocity is 600s-1。
Also can adopt continuous annealing to process to the hot rolled plate after the pickling, or the hot rolled plate annealing in process of coffin annealing processing. In addition, the coiled material after coiling hot rolling under 750～1000 ℃ the temperature, the heat that also can keep by coiled material itself in 5 minutes～5 hours scope carries out annealing in process own. Or, also can be after hot rolling finishes, do not meet in the situation of water filling of time of specific formula the coiling coiled material.
The hot rolled plate that obtains in the manner described above also can carry out smart hot rolling after carrying out 1 time cold rolling step, or after cold rolling more than 2 times that accompanies that intermediate annealing processes, carries out smart annealing in process. In addition, being used to form the accurately machined rolling of final thickness of slab also can be undertaken by known cold rolling technology, but the occasion in high Si composition system, in order to prevent the fracture in the operation of rolling, or situation is split on the limit, also can improve according to Si content the temperature of steel plate, coiled material be impregnated in the warm water, or carry out warm rolling in 100～400 ℃ scope.
In addition, after this, also carry out the skin-pass step, in order to form product. Occasion adding the skin-pass step if skin-pass calendering rate does not reach 2%, then can not obtain its effect, when surpassing 20% because magnetic can variation, like this should the calendering rate in 2～20% scope.
The below is described the actual conditions of each technological operation given to this invention.
Omit the influence of frictional coefficient in the technology, during smart hot rolling in the hot-rolled sheet anneal to magnetic
At first, the process conditions of the present invention of omitting the occasion that smart hot-roll annealing handles is described.
The steel plate that is formed by mentioned component is by melting in converter, continuous casting, or the mode of ingot casting-split rolling method forms.Steel plate heats by known method.This plate is carried out hot rolling, form the thickness of regulation.
In smart hot rolling,, in the roll water coolant, sneak into lubricating oil in order to reduce work roll in the smart hot rolls and the frictional coefficient between the steel plate.In order to prevent that lubricating oil and water coolant from separating, can add interfacial agent as required.When smart hot rolling, sneak into lubricating oil content in the roll water coolant according to the volume percent meter in 0.5～20% scope.When the lubricating oil content in the roll water coolant less than 0.5% the time, can not obtain its effect, when 20% when above, its effect takes place saturated, is uneconomic like this, above-mentioned thus amount is below 20%.
The influence that hot-rolling roll when investigating smart hot rolling and the average friction coefficient between the steel plate are produced product magnetic, the test below having carried out.The steel of composition carries out melting shown in the his-and-hers watches 1, carries out smart hot rolling afterwards.
By changing the lubricating oil content in the roll water coolant, the average friction coefficient when making smart hot rolling changes in 0.1～0.3 scope.This average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Smart hot rolling outlet temperature remains on 860 ℃, is processed into the thickness of 2.0mm.It is carried out pickling, cold rolling, the thickness of formation 0.35mm, after carrying out skimming treatment, steel A is at 900 ℃, and steel B carries out 30 seconds anneal respectively at 980 ℃, and cutting goes out the iron loss test portion, measures magnetic properties.
Product magneticflux-density when Fig. 2 represents smart hot rolling is to the dependency of average friction coefficient.This average friction coefficient adopt in the smart hot rolls to mean value at each frame measured value.Know that the average friction coefficient when smart hot rolling is less than 0.25 the time, the product magneticflux-density increases.In addition, in order to understand the reason that above-mentioned phenomenon takes place, the metal structure of the hot-rolled sheet of steel A is observed by opticmicroscope.Figure 11 represents this observations.As Figure 11 A, shown in the C, be in the hot-rolled sheet of 0.21 steel A of the present invention, even, still form by extending granuloplastic thick tissue for the zone at thickness of slab top layer, center at average friction coefficient.Relative therewith, as Figure 11 B, shown in the D, know, be about in the hot-rolled sheet of steel A of 0.35 comparative example at average friction coefficient, from the top layer to thickness of slab 1/10 near the degree of depth, see the equant grains tissue that is formed by recrystallized structure, the crystal structure particle diminishes in addition, even in vicinity, thickness of slab center, still can see tiny recrystallize particle, crystal boundary density is bigger.
By inference, the reason of above-mentioned situation is: because the average friction coefficient of the variation of above-mentioned hot rolling crystal structure can make smart hot rolling the time reduces, the shearing strain that is produced in the steel plate reduces like this, thereby just obtain and carry out the identical effect of hot rolled to hang down the calendering rate, because the lattice imperfection density in the steel plate reduces, before crystal structure is presenting recrystallize, form by the granuloplastic regenerating tissues of thick extension, so just obtain the effect of the actual increase of particle diameter of hot rolling microstructure.
In the manner described above, the inventor etc. have successfully developed following technical scheme, this technical scheme when reducing smart hot rolling steel plate and the means of the average friction coefficient between the roll, suppress the recrystallize of hot rolling crystal structure, carry with following technical conceive
-1Si is the magnetic of non-oriented electromagnetic steel sheet having, particularly magneticflux-density, and this technical conceive is with increase the rise mode that promotes recrystallize and particle growth of hot rolling outlet temperature actual particle size, in the prior art by what is called different fully.
According to the manufacture of the non-oriented electromagnetic steel sheet having of high flux density low iron loss described in the top test, smart hot rolled rolling with in the value of the average friction coefficient between roll and the steel plate, the mean value of all breaker rolls can be below 0.25 in the smart hot rolling.When 0.25 when above, according to aforementioned manner, owing to produce the recrystallize particle, the particle of the crystal structure of vicinity, particularly smart hot rolling top layer diminishes, thereby the product magneticflux-density reduces.Though the lower limit of frictional coefficient is set especially, when this is worth when too small, in the operation of rolling, can produce slip, limp stably is so best above-mentioned frictional coefficient is more than 0.05.
The hot-rolled sheet of Huo Deing also can then carry out smart anneal carrying out cold rolling step 1 time in the manner described above, or 2 times of accompanying that process annealing handles cold rolling after, carry out smart anneal.
In addition, after this also can carry out the skin-pass step, form product.
Table 1 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ????sol-Al | ????N | |
| Steel A | ??0.0018 | ????2.10 | ???0.19 | ??0.0019 | ????0.30 | ??0.0015 |
| Steel B | ??0.0015 | ????3.00 | ???0.10 | ??0.0015 | ????0.70 | ??0.0017 |
Maximum distortion speed when the hot-rolled sheet anneal is omitted smart hot rolling in the technology is to the influence of magnetic
Below Deformation velocity is described the influence that effect of the present invention causes.
The Deformation velocity of the mill train when investigating smart hot rolling is to the influence of product magnetic, the test below having carried out.The steel of melting table 2 composition carries out hot rolling and handles.
Table 2 is supplied with the examination material component
| ????C | ????Si | ???Mn | ?????S | ????Al | ?????N |
| ????0.0019 | ???2.10 | ??0.11 | ???0.0017 | ???0.24 | ???0.0018 |
Deformation velocity when changing smart hot rolling is tested in the mode that changes roll speed, mill train program.The mode that obtains maximum distortion speed according to last frame place is adjusted the mill train program.Smart hot rolling outlet temperature is 860 ℃, is finish-machined to the thickness of 2.5mm, carries out water-cooled, at 650 ℃ it is reeled.
By changing the lubricating oil content in the roll water coolant, the average friction coefficient during with smart hot rolling is controlled at 0.20.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.
The hot-rolled sheet that is obtained is carried out pickling, and cold rolling, making its thickness is 0.50mm, carry out skimming treatment after, at 950 ℃, it is carried out anneal reaches 30 seconds, cutting goes out the iron loss test portion, measures magnetic properties.
The dependency of the Deformation velocity of the final mill train when Fig. 3 represents the product magneticflux-density to smart hot rolling.According to Fig. 3 as can be known, when Deformation velocity at 150s
-1When above, the product magneticflux-density increases.
In addition, the calculating of Deformation velocity is carried out according to the following equation.Here, r represents draft %/100, and n represents the rotation times (rpm) of roll, and R represents rolling with roller radius (mm), H
0Represent rolling preceding thickness of slab (mm).
Deformation velocity=(2 π n/ (60r
0.5)) (R/H
0)
0.5In (1/ (1-r))
According to the manufacture of the non-oriented electromagnetic steel sheet having of high flux density low iron loss described in the superincumbent test, in smart hot rolling, the Deformation velocity of at least 1 mill train can be at 150s
-1More than.The upper limit of Deformation velocity needn't be set especially.This is that the upper limit of Deformation velocity is determined by itself because the shape of the capacity of equipment of relatively hot milling train and hot-rolled sheet is controlled.That is, Deformation velocity determined by roll speed, hot-rolling roll diameter, draught, if roll speed, draught strengthen, Deformation velocity increases, but is difficult to the shape of hot-rolled steel sheet is controlled.Because in order to provide use with non-oriented electromagnetic steel sheet having in stacked mode, must carry out strict control to its shape, the increase nature of Deformation velocity will have boundary like this.According to this viewpoint, Deformation velocity is with 600s
-1Be boundary.
Also can carry out 1 time cold rolling step to the hot-rolled sheet that obtains in the manner described above, carry out smart anneal afterwards, or after this also carry out the skin-pass step, thereby form product.
Also have, in order stably to carry out smart hot rolling according to high Deformation velocity of the present invention and low-friction coefficient, following manner is effective especially, and this mode is: the thin slab after the roughing is connected with last thin slab, carries out smart hot rolling continuously.
The method of attachment of last thin slab and follow-up thin slab comprises that the front end with the rearward end of last thin slab and follow-up thin slab flushes, the compression bonding method that this portion of flushing is exerted pressure, when the portion of flushing is exerted pressure, carry out laser welding method, the portion of flushing is being carried out carry out method of crimping etc. in induction welding.
Average friction coefficient when the hot-rolled sheet anneal is omitted smart hot rolling in the technology and maximum distortion speed are to the influence of magnetic
Then, carry out following test, so that average friction coefficient during to smart hot rolling and maximum distortion speed describe the influence that effect of the present invention produces simultaneously.The steel of the composition shown in the melting table 2 carries out smart hot rolling to it.
Deformation velocity when changing smart hot rolling changes roll speed, mill train program, tests.For maximum distortion speed in the end obtains the mill train program is adjusted in the frame place.In addition, the calculating of Deformation velocity is carried out according to the following equation.Here, r represents draft %/100, and n represents the rotation times (rpm) of roll, and R represents rolling with roller radius (mm), H
0Represent rolling preceding thickness of slab (mm).
Deformation velocity=(2 π n/ (60r
0.5)) (R/H
0)
0.5Ln (1/ (1-r))
By changing the lubricating oil content in the roll water coolant, the average friction coefficient when controlling smart hot rolling.This average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.
Smart hot rolling outlet temperature is 860 ℃, and precision work is the thickness of 2.5mm, carries out water-cooled, at 650 ℃ it is reeled.
The hot-rolled sheet that is obtained is carried out pickling, and cold rolling, making its thickness is 0.50mm, carry out skimming treatment after, at 950 ℃, it is carried out anneal reaches 30 seconds, cutting goes out the iron loss test portion, measures magnetic properties.
Relation between the magneticflux-density of average friction coefficient, Deformation velocity and product when Fig. 4 represents smart hot rolling under the hot rolling occasion.According to Fig. 4 as can be known, be 0.25 at the average friction coefficient that is positioned at specialized range of the present invention, and maximum distortion speed is at 150s
-1Above zone can obtain the above high magnetic flux density of 1.68T.
Comprise and adopt continuous annealing to handle, or the technology of the hot-rolled sheet anneal of pack annealing processing mode
Carry out following test below, so that investigation is to carry out before cold rolling the occasion of hot-rolled sheet anneal, the influence that roll that the hot rolling during smart hot rolling is used and the average friction coefficient between the steel plate produce product magnetic.The steel of composition shown in the melting table 3 carries out smart hot rolling and handles.
By changing the lubricating oil content in the roll water coolant, the frictional coefficient when making smart hot rolling changes in the scope more than 0.1～0.3.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Smart hot rolling outlet temperature remains on 900 ℃, is finish-machined to the thickness of 2.0mm, and after hot rolling finished, sharply cooling was reeled to it at 500 ℃.
By continuous annealing furnace, steel C at 950 ℃,, is carried out anneal to above-mentioned coils of hot rolled and reaches 90 seconds at 980 ℃ steel D.It is carried out pickling, and cold rolling, making its thickness is 0.35mm, carry out skimming treatment after,, at 980 ℃ it is carried out anneal for steel D and reaches 30 seconds at 900 ℃ for steel C, cutting goes out the iron loss test portion, measures magnetic properties.
The dependency of the average friction coefficient when Fig. 5 represents the product magneticflux-density to smart hot rolling.Average friction coefficient adopt in the smart hot rolls at each frame measured value.According to Fig. 5 as can be known, the average friction coefficient when smart hot rolling is 0.25 when following, and the product magneticflux-density increases.
According to the manufacture of the non-oriented electromagnetic steel sheet having of high flux density low iron loss described in above-mentioned test, mean values in the roll of the rolling usefulness of smart hot rolled and the value of the frictional coefficient between the steel plate, smart all breaker rolls of hot rolling can be below 0.25.When 0.25 when above, its effect is not fine, and the product magneticflux-density reduces.
Table 3 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | |
| Steel C | ??0.0018 | ???2.10 | ???0.19 | ??0.0019 | ????0.30 | ??0.0015 |
| Steel D | ??0.0015 | ???3.00 | ???0.10 | ??0.0015 | ????0.70 | ??0.0017 |
According to the present invention, carry out smart hot rolled occasion with low friction ratio, in the time of in the engaging-in smart hot rolls of thin slab, can produce following situation, the engaging-in bad of thin slab promptly taken place, produce between roll and the steel plate in smart course of hot rolling and slide, the rolling life-span with roll significantly shortens, and produces darker rolling scar on the steel plate top layer.In addition, problem in the smart hot rolling of the low friction ratio that following solution is above-mentioned, and it is effective especially stably to carry out method of operating, and this method referred to before smart hot rolling, thin slab after the roughing is connected with last thin slab, this thin slab is carried out the smart hot rolling of successive.
In addition, the effect of the hot-rolled condition that offers the metal structure after the hot-rolled sheet anneal is investigated.The steel that the steel C of the composition shown in the melting table 3 forms carries out smart hot rolling to it.
At first, as example of the present invention, according to the percentage by volume meter, making the lubricating oil content in the roll water coolant is 2%, thereby the average friction coefficient when making smart hot rolling is 0.21, and in the end maximum distortion speed is 270s in the frame place
-1As a comparative example, be 0.3% by making the lubricating oil content in the roll water coolant, the average friction coefficient during with smart hot rolling adjusts to 0.35, and the maximum distortion speed at last frame place is 120s
-1Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.For example of the present invention and comparative example, smart hot rolling outlet temperature all remains on 860 ℃, and precision work thickness is 0.23mm.By continuous annealing furnace, at 950 ℃ it is carried out the hot-rolled sheet anneal and reach 90 seconds.Adopt the hot-rolled sheet that is obtained, cutting goes out the iron loss test portion, by opticmicroscope the metal structure of hot-rolled sheet is observed.Figure 12 represents its result.Shown in Figure 12 A, adopt average friction coefficient lower, the present invention that Deformation velocity is higher, the comparative example shown in then relative Figure 12 B, the metal structure chap after the hot-rolled sheet anneal.Consequently, can infer that the magnetic of the product after cold rolling, the anneal is further improved.
Can think, one of reason of changes of hot rolling crystal structure after the above-mentioned hot-rolled sheet anneal is: the average friction coefficient when making smart hot rolling reduces, suppress the recrystallize of crystal structure, produce bigger accumulated deformation, the motivating force of the particle growth during the hot-rolled sheet anneal increases.In addition, can infer,, can produce bigger accumulated deformation, can further promote above-mentioned effect like this by increasing Deformation velocity.
Then, carry out following test, so as to be cold rolling before, carry out the occasion of hot-rolled sheet anneal, average friction coefficient and maximum distortion speed during smart hot rolling are described the influence that effect of the present invention produces simultaneously.The steel of the composition that melting is shown in Figure 4 carries out smart hot rolling.
Deformation velocity when changing smart hot rolling changes roll speed, mill train program, tests.For maximum distortion speed in the end obtains the mill train program is adjusted in the frame place.In addition, the calculating of Deformation velocity is carried out according to the following equation.Here, r represents draft %/100, and n represents the rotation times (rpm) of roll, and R represents rolling with roller radius (mm), H
0Represent rolling preceding thickness of slab (mm).
Deformation velocity=(2 π n/ (60r
0.5)) (R/H
0)
0.51n (1/ (1-r))
By changing the lubricating oil content in the roll water coolant, the average friction coefficient during to smart hot rolling is controlled.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.
Smart hot rolling outlet temperature remains on 900 ℃, is finish-machined to the thickness of 2.5mm, carries out water-cooled, at 650 ℃ to its coiling.By continuous annealing furnace,, it is carried out anneal reach 2 minutes at 930 ℃.
The hot-rolled sheet that is obtained is carried out pickling, and cold rolling, making its thickness is 0.50mm, carry out skimming treatment after, at 900 ℃, it is carried out anneal reaches 30 seconds, cutting goes out the iron loss test portion, measures magnetic properties.
Average friction coefficient during smart hot rolling when Fig. 6 represents hot rolling, the relation between the magneticflux-density of Deformation velocity and product.As can be seen from Figure 6, below 0.25, and maximum distortion speed is at 150s at the average friction coefficient that is positioned at specialized range of the present invention
-1Above zone obtains the above high magnetic flux density of 1.72T.
Table 4 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ?????N |
| ??0.0011 | ???2.50 | ???0.20 | ??0.0013 | ????0.23 | ???0.0011 |
Afterwards, carry out following test, so that the hot-rolled sheet anneal time, the hot-rolled sheet anneal temperature that adopt the continuous annealing processing mode are investigated the influence that magneticflux-density causes.The steel C of the composition shown in the melting table 5 carries out smart hot rolling to it.
Lubricating oil content in the roll water coolant when adjusting smart hot rolling, making average friction coefficient is 0.21, and smart hot rolling outlet temperature remains on 900 ℃, is finish-machined to the thickness of 2.0mm, and after hot rolling, sharply cooling is reeled to it at 500 ℃.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.In addition, the Deformation velocity at last frame place is 290s
-1
By continuous annealing furnace, under 950 ℃ anneal temperature,, this coils of hot rolled is carried out anneal by changing the anneal time.In addition, making the time of the hot-rolled sheet anneal that adopts the continuous annealing processing mode is 90 seconds, changes the anneal temperature.It is carried out pickling, and cold rolling, making its thickness is 0.35mm, carry out skimming treatment after, at 900 ℃, it is carried out anneal reaches 30 seconds, cutting goes out the iron loss test portion, measures magnetic properties.
The influence that the hot-rolled sheet anneal time that Fig. 7 represents to adopt the continuous annealing processing mode causes the magneticflux-density of product.As shown in Figure 7, when the anneal time below 20 seconds the time, do not obtain to improve the effect of magneticflux-density by the hot-rolled sheet anneal, when the anneal time more than 5 minutes the time, can produce darker rolling mill scale at surface of steel plate, the generation pickling is bad, produces significant uneven surface on the steel plate top layer.Therefore, according to the present invention, the hot-rolled sheet anneal time of adopting the continuous annealing processing mode is in 20 seconds～5 minutes scope.From the effect of anneal, and economy, the hot-rolled sheet anneal time of preferably adopting the continuous annealing processing mode is in 30 seconds～3 minutes scope.
The influence that Fig. 8 represents to adopt the hot-rolled sheet anneal temperature of continuous annealing processing mode that the product magneticflux-density is caused.As shown in Figure 8, when anneal temperature during less than 850 ℃, do not obtain to improve the effect of magneticflux-density by the hot-rolled sheet anneal that adopts the continuous annealing processing mode, when the anneal temperature more than 1150 ℃ the time, owing to form darker rolling mill scale, the generation pickling is bad, produces significant uneven surface on the steel plate top layer.Therefore, according to the present invention, the hot-rolled sheet anneal temperature that adopts the continuous annealing processing mode is in 850 ℃～1150 ℃ scope.From the effect of anneal, and economy, the hot-rolled sheet anneal temperature that preferably adopts the continuous annealing processing mode is in 850 ℃～1000 ℃ scope.
According to the present invention, also can carry out the hot-rolled sheet anneal by the pack annealing processing mode.At this moment, when hot-rolled sheet anneal temperature during less than 750 ℃, improving the necessary anneal time of product magneticflux-density and significantly extend, is uneconomic like this.In addition, when the anneal temperature more than 850 ℃ the time, aspect the facility investment of stove, require a large amount of expenses, when anneal, can produce coiled material burn phenomenon.For above-mentioned reasons, in the occasion of the hot-rolled sheet anneal that adopts the pack annealing processing mode, the following of anneal temperature is limited to 750 ℃, and is limited to 850 ℃ on it.At this moment, if the hot-rolled sheet anneal time of adopting the pack annealing processing mode, because the necessary anneal temperature of improvement of product magnetic significantly increases, the facility investment of stove itself was excessive below 5 minutes, uneconomical, the following of anneal time was limited to more than 5 minutes like this.In addition, when the hot-rolled sheet anneal time surpassed 30 hours, the occasion too high with the anneal temperature was identical, owing to can produce the situation of coiled material burn, the hot-rolled sheet anneal time of adopting the pack annealing processing like this is in 30 hours.
In the manner described above, also can carry out 1 time cold rolling step, carry out smart anneal afterwards, or also can carry out the skin-pass step afterwards, thereby form product the hot-rolled sheet that has carried out the hot-rolled sheet anneal.
Above-mentioned smart anneal adopts the continuous annealing processing mode to carry out, but this moment, also can be according to disclosed mode in the clear 61-231120 document of TOHKEMY, in early stage, in 950～1100 ℃ temperature range, carry out anneal with 5 seconds～1 minute short period, in the later stage, with in 800～950 ℃ temperature range, keep the method for 10 seconds～2 minutes short period to carry out smart anneal.
Annealing treatment logos technology own
Carry out following test below, so that to carrying out in the process of anneal own at the maintenance heat by coils of hot rolled, roll and the average friction coefficient between the steel plate that the hot rolling during smart hot rolling is used are investigated the influence that the product magneticflux-density causes.The steel of the composition shown in the melting table 5 carries out smart hot rolling to it.
By changing lubricating oil content, the composition in the roll water coolant, the frictional coefficient when making smart hot rolling changes in the scope more than 0.1～0.3.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Smart hot rolling outlet temperature remains on 1000 ℃, is finish-machined to the thickness of 2.5mm, 900 ℃ to its coiling, put it in the holding furnace afterwards at once, carry out anneal own at 860 ℃ and reach 1 hour.The Deformation velocity at last frame place is 300s
-1
It is carried out pickling, and cold rolling, making its thickness is 0.50mm, carry out skimming treatment after,, at 980 ℃, it is carried out anneal reaches 45 seconds at 900 ℃ for steel E for steel F, cutting goes out the iron loss test portion, measures magnetic properties.
The dependency of the average friction coefficient when Fig. 9 represents the product magneticflux-density to smart hot rolling.Average friction coefficient adopt in the smart hot rolls to mean value at each frame measured value.According to Fig. 9 as can be known, the average friction coefficient when smart hot rolling is 0.25 when following, and the product magneticflux-density increases.
According to the manufacture of the non-oriented electromagnetic steel sheet having of high flux density low iron loss described in the superincumbent test, mean values in the roll of the rolling usefulness of smart hot rolled and the value of the frictional coefficient between the steel plate, smart all breaker rolls of hot rolling can be below 0.25.When it surpassed 0.25, its effect was not fine, and the product magneticflux-density reduces.
Table 5 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | |
| Steel E | ???0.0019 | ???2.15 | ???0.12 | ??0.0017 | ????0.25 | ??0.0018 |
| Steel F | ???0.0018 | ???3.02 | ???0.11 | ??0.0018 | ????0.61 | ??0.0015 |
When according to the present invention, according to low friction ratio, or low friction ratio and high Deformation velocity are carried out smart hot rolled occasion, in the time of in the engaging-in smart hot rolls of thin slab, can produce following situation, promptly thin slab is engaging-in bad, in smart course of hot rolling and steel plate between produce and slide, the life-span of the roll of rolling usefulness significantly shortens, and produces darker rolling scar on the steel plate top layer.Problem in the smart hot rolling of the following above-mentioned low friction ratio of solution, the stable method of operating of carrying out are effective especially, and this method referred to before smart hot rolling, and the thin slab after the roughing is connected with last thin slab, and this thin slab is carried out the smart hot rolling of successive.
Because when the coiling temperature of the coiled material that carries out anneal own during less than 750 ℃, the improvement of magnetic is not fine, this temperature is more than 750 ℃ like this.Owing to when said temperature surpasses 1000 ℃, be easy to generate the coiling skew of coiled material, also can stimulate the steel plate top layer to produce oxidation, said temperature is below 1000 ℃ like this.
Because when the time of anneal own is less than 5 minutes, the improvement of magnetic is not fine, like this should the time more than 5 minutes.In addition, owing to when the above-mentioned time surpasses 5 hours, can not stimulate the oxidation of steel plate, it is bad still pickling to take place easily but, like this should the time below 5 hours.From effect, the economy of anneal, the preferred anneal time own is in 30～120 minutes scope.
According to the present invention, in order to prevent to be in the coiled material generation oxidation in the anneal process own, also can contain the reducing gas medium of hydrogen, or rare gas element media such as nitrogen, argon gas, perhaps under reduced pressure carry out anneal own.
The hot-rolled sheet that has carried out anneal own in the manner described above also can carry out 1 time or accompany the cold rolling step more than 2 times of process annealing processing, then carries out smart anneal, or after this also carries out the skin-pass step, so that form product.
Since when the calendering rate of skin-pass less than 2% the time, do not obtain its effect, when individual calendering rate above 20% the time, the magnetic variation, like this should the calendering rate in 2～20% scope.
When smart hot rolling, per-cent meter by volume, the content of sneaking into the lubricating oil in the roll water coolant is in 0.5～20% scope.In order to prevent that lubricating oil from separating with water coolant, adds interfacial agent as required.When the lubricating oil content in the roll water coolant less than 0.5% the time, do not obtain its effect, when this content 20% when above, this effect is saturated, is uneconomic like this, thus this content is less than 20%.
The hot-rolled sheet of Huo Deing is handled by cold rolling and continuous annealing once and is formed product in the manner described above.Can add the skin-pass step in addition, thereby form product.Since when the calendering rate of skin-pass less than 2% the time, do not obtain its effect, when this calendering rate 20% when above, the magnetic variation, like this should the calendering rate in 2～20% scope.
The technology that hot rolling finishes the no water filling of back certain hour is set
Carry out following test below, so that roll and the average friction coefficient between the steel plate that the hot rolling during to smart hot rolling is used are investigated the influence that magneticflux-density causes.The steel G of the composition shown in the melting table 6 carries out smart anneal to it.
By changing lubricating oil content, the lubricating oil family in the roll water coolant, the frictional coefficient when making smart hot rolling changes in 0.1～0.3 scope.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Smart hot rolling outlet temperature remains on 1050 ℃, and according to formula (1), no water injection time is 3.5 seconds, afterwards to its cooling, at 680 ℃ it is reeled.The Deformation velocity at the last frame of smart hot rolling place is 290s
-1
It is carried out pickling, and cold rolling, making its thickness is 0.50mm, carry out skimming treatment after, at 900 ℃, it is carried out anneal reaches 30 seconds, cutting goes out the iron loss test portion, measures magnetic properties.
The dependency of the average friction coefficient when Figure 10 represents the product magneticflux-density to smart hot rolling.Average friction coefficient adopt in the smart hot rolls to mean value at each frame measured value.According to Figure 10 as can be known, the average friction coefficient when smart hot rolling is 0.25 when following, and the product magneticflux-density increases.
According to the manufacture of describing the non-oriented electromagnetic steel sheet having of high flux density low iron loss in the superincumbent test, mean values in the roll of the rolling usefulness in the smart hot rolling and the value of the average friction coefficient between the steel plate, smart all breaker rolls of hot rolling can be below 0.25.When surpassing 0.25, its effect is not fine, and the product magneticflux-density reduces.Needn't set especially the lower limit of frictional coefficient, but, in the operation of rolling, can produce slip, stably limp owing to be worth when too small when this?, so preferably this frictional coefficient is more than 0.05.
Table 6 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | |
| Steel G | ??0.0017 | ???2.50 | ???0.22 | ??0.0016 | ????0.28 | ??0.0019 |
According to the present invention, with low-friction coefficient, or low-friction coefficient and high Deformation velocity are carried out smart hot rolled occasion, in the time of in the engaging-in smart hot rolls of thin slab, can produce following situation, it is engaging-in bad that this situation refers to take place thin slab, produces between roll and the steel plate in smart course of hot rolling and slide, the life-span of the roll of rolling usefulness significantly shortens, and produces darker rolling scar on the steel plate top layer.Problem in the smart hot rolling of the following above-mentioned low friction ratio of solution, it is effective especially stably to carry out method of operating, and this method referred to before smart hot rolling, and the thin slab after the roughing is connected with last thin slab, and this thin slab is carried out the smart hot rolling of successive.
Coiling temperature for coiled material needn't limit, but when at high temperature, producing the over oxidation layer through the surface of steel plate after the hot rolling, in order to prevent pickling, is preferably in 750 ℃ it is reeled.
No water filling setting-up time after hot rolling finishes is determined by the relation between T ℃ of itself and hot rolling concluding time in the following manner.The inventor etc. are to adopting low-friction coefficient, or in the smart hot rolling of low-friction coefficient and high Deformation velocity, hot rolling outlet temperature T (℃), hot rolling finishes the back and begins time t (second) before and the relation between the magnetic is made a concrete analysis of to water filling, consequently:
950≤T (℃)≤1150 ... formula (1)
9.6-8 * 10
-3T≤t (second)≤15.6-8 * 10
-3T ... formula (2)
According to above-mentioned formula (1), in (2) determined temperature range, can determine to satisfy the good condition of pickling, limp speed, magnetic.In addition, when hot rolling finishes the time of back before water filling begins when surpassing by determined time of formula (2), steel plate refrigerative deficiency of time in order at high temperature to reel, or cools off fully, has to reduce roll speed, thus the productivity reduction.Coiled material can produce to reel and depart from owing at high temperature reel, and harm such as pickling reduction are not so preferably adopt this mode.For this reason, no water injection time is that the upper limit determined by formula (2) is below the time.When the time of being determined by formula (2) relatively, when no water injection time shortened, the improvement of magnetic was inadequate.With hot rolling outlet temperature T (℃) identical less than 950 ℃ occasion, the improvement of magnetic is insufficient.In addition, in order to make the hot rolling outlet temperature above 1150 ℃, in hot-rolled step with general roughing, finish rolling, must significantly improve the Heating temperature of plate, in plate heat-processed, can in course of hot rolling, fine separate out like this through molten admittedly again precipitate, the remarkable variation of magnetic, hot rolling outlet temperature thus is below 1150 ℃.
Also can carry out 1 time cold rolling step according to the present invention, then carry out smart anneal, or also carry out the skin-pass step afterwards, thereby form product.
Because in the occasion of adding the skin-pass step, when skin-pass calendering rate less than 2% the time, do not obtain its effect, when this calendering rate surpasses 20%, the magnetic variation, like this should the calendering rate in 2～20% scope.
Below embodiments of the invention are described.
The 1st embodiment
With general method the non-oriented magnetic steel with the composition shown in the table 7 is heated with plate, by roughing mill it is processed as the thick section bar that thickness is 35mm, after this being processed into to thickness by smart hot rolls is the material of 1.8mm.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls, and the mixed volume by making this lubricating oil by volume per-cent meter changes in 0.2～10% scope, and frictional coefficient is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The hot rolling processing temperature is 860 ℃.
After this, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace,, it is carried out anneal reach 30 seconds at 940 ℃.Then it is cut into the iron loss test portion, measure magnetic properties.Table 8 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when reducing smart hot rolling then can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 7 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ??????S | ???sol-Al | ?????N |
| ???0.0011 | ???2.10 | ???0.20 | ????0.0014 | ????0.20 | ???0.0011 |
Table 8 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.16 ????0.20 ????0.28 ????0.35 | ????1.708 ????1.707 ????1.659 ????1.655 | ????3.42 ????3.46 ????3.76 ????3.79 |
The 2nd embodiment
With general method the non-oriented magnetic steel with the composition shown in the table 9 is heated with plate, it is processed as the thick section bar that thickness is 36mm, after this, be processed into the material that thickness is 2.3mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls, and the mixed volume by making this lubricating oil by volume per-cent meter changes in 0.2～7% scope, and frictional coefficient is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.At this moment, smart hot rolling outlet temperature is 950 ℃, and then it is sharply cooled off, and it is reeled.By continuous annealing furnace, at 930 ℃ the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal and reach 2 minutes.
After this, it is carried out pickling, being processed into to thickness by cold rolling mode is the material of 0.50mm.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Then it is cut into the iron loss test portion, measure magnetic properties, table 10 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, average friction coefficient when smart hot rolling is reduced to below 0.25, and when the hot-rolled sheet annealing conditions suitably controlled, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 9 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0015 | ???2.51 | ???0.20 | ???0.0013 | ????0.24 | ???0.0011 |
Table 10 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.17 ????0.21 ????0.28 ????0.35 | ????1.732 ????1.731 ????1.710 ????1.708 | ????2.91 ????2.95 ????3.11 ????3.12 |
The 3rd embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 11 is heated, it is processed as the thick section bar that thickness is 30mm, after this, be processed into the material that thickness is 1.0mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls,, frictional coefficient is adjusted by changing the mixed volume of this lubricating oil.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Smart hot-rolled temperature is 860 ℃.
After this, it is carried out pickling, being processed into to thickness by cold rolling mode is the material of 0.50mm.By continuous annealing furnace, at 940 ℃ it is carried out anneal and reach 30 seconds.Then, it is cut into the iron loss test portion, measure magnetic properties, table 12 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, the average friction coefficient when making smart hot rolling reduces, and can obtain following non-oriented electromagnetic steel sheet having, and it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
In addition, according to table 12 as can be known, by mode, hang down rolling, the cold rolling draft decline 50% of friction, thereby can significantly improve the magneticflux-density of product according to present embodiment.
Table 11 is supplied with the examination material component
| ????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ??0.0016 | ???2.00 | ???0.18 | ???0.0015 | ????0.25 | ???0.0016 |
Table 12 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention of the present invention | ????0.11 ????0.16 ????0.20 ????0.28 ????0.35 | ????1.710 ????1.710 ????1.708 ????1.660 ????1.655 | ????3.41 ????3.42 ????3.45 ????3.75 ????3.78 |
The 4th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 13 is heated, it is processed as the thick section bar that thickness is 35mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Volume percent by 5% is sneaked into lubricating oil in the roll water coolant in the smart hot rolls, and every breaker roll frictional coefficient is adjusted into 0.19.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.In addition, to slide in order preventing to produce between the steel plate and work roll when the smart hot rolling, thereby to form scar, thin slab after the roughing and last thin slab are welded, it is carried out smart hot rolling continuously at surface of steel plate.At this moment, smart hot-rolled temperature is 860 ℃, at once it is carried out water-cooled, at 650 ℃, it is reeled.For maximum distortion speed in the end obtains at the frame place, the mill train program is adjusted.The Deformation velocity at last frame place is at 131～322s
-1Scope in change.
Then, it is carried out pickling, being processed into to thickness by cold rolling mode is the material of 0.50mm.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Then, it is cut into the iron loss test portion, measure magnetic properties, table 14 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, the average friction coefficient when making smart hot rolling reduces, and the Deformation velocity of at least 1 mill train is controlled at 150s
-1More than, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 13 is supplied with the examination material component
| ????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ??0.0015 | ???1.60 | ???0.12 | ???0.0014 | ????0.25 | ???0.0016 |
Table 14 magnetic measurement result
| Last Deformation velocity (the s of frame place -1) | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example is of the present invention | ????131 ????175 ????232 ????265 ????322 | ????1.708 ????1.728 ????1.731 ????1.735 ????1.736 | ????4.49 ????4.13 ????4.01 ????4.00 ????3.99 |
The 5th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 15 is heated, it is processed as the thick section bar that thickness is 40mm, after this, be processed into the material that thickness is 2.0mm by smart hot rolls by roughing mill.Under emulsion state, lubricating oil sneaked in the roll water coolant in the smart hot rolls,, frictional coefficient is adjusted by changing its mixed volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 305s
-1
In addition, slide in order to prevent to produce between the steel plate and work roll when the smart hot rolling, thereby form scar at surface of steel plate, after roughing, the front end of the rearward end of last thin slab and follow-up thin slab is flushed, this portion of flushing is exerted pressure, this portion of flushing is connected, it is carried out smart hot rolling continuously by the laser welding mode.At this moment, smart hot-rolled temperature is 860 ℃.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Then, it is cut into the iron loss test portion, measure magnetic properties, table 16 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when reducing smart hot rolling can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 15 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ?????N |
| ??0.0017 | ???2.95 | ???0.11 | ??0.0017 | ????0.60 | ???0.0015 |
Table 16 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention of the present invention | ????0.12 ????0.14 ????0.21 ????0.28 ????0.34 | ????1.661 ????1.660 ????1.659 ????1.639 ????1.637 | ????2.38 ????2.38 ????2.39 ????2.54 ????2.55 |
The 6th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 17 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.According to Deformation velocity, by 2～11% volume percent, lubricating oil is sneaked in the roll water coolant in the smart hot rolls, every breaker roll frictional coefficient is adjusted into 0.20.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.In addition, slide in order to prevent to produce between the steel plate and work roll when the smart hot rolling, thereby form scar at surface of steel plate, after roughing, the front end of the rearward end of last thin slab and follow-up thin slab is flushed, this portion of flushing is exerted pressure, this portion of flushing is connected, it is carried out smart hot rolling continuously by the laser welding mode.At this moment, smart hot-rolled temperature is 860 ℃, immediately to its water-cooled, at 650 ℃ it is reeled.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 940 ℃ it is carried out anneal and reach 30 seconds.Then, it is cut into the iron loss test portion, measure magnetic properties, table 18 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the final mill train Deformation velocity during with smart hot rolling is brought up to 150s
-1More than, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 17 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0018 | ???2.06 | ???0.11 | ???0.0017 | ????0.20 | ???0.0016 |
Table 18 magnetic measurement result
| Last Deformation velocity (the s of frame place -1) | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example is of the present invention | ????133 ????172 ????210 ????253 ????310 | ????1.660 ????1.682 ????1.690 ????1.694 ????1.695 | ????3.76 ????3.59 ????3.57 ????3.52 ????3.50 |
The 7th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 19 is heated, it is processed as the thick section bar that thickness is 40mm, after this, be processed into the material that thickness is 2.0mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls,, frictional coefficient is adjusted by changing its mixed volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.At this moment, smart hot rolling outlet temperature is 900 ℃.The Deformation velocity at last frame place is 320s
-1By continuous annealing furnace, at 900 ℃ the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal and reach 2 minutes.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 minutes.Then, it is cut into the iron loss test portion, measure magnetic properties.
In addition, material shown in Figure 19 is applied identical condition, until pickling, the thickness of slab that after this makes cold rolling processing is 0.55mm.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Then, it is carried out skin-pass, its thickness is processed as 0.50mm, cutting goes out the iron loss test portion, at 750 ℃, to its generation distortion anneal of carrying out 2 hours, measures magnetic properties.
Table 20 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, and the Deformation velocity of at least 1 mill train is controlled at 150s
-1More than, the hot-rolled sheet annealing conditions is suitably controlled, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 19 is supplied with the examination material component
| ????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ??0.0019 | ???2.00 | ???0.19 | ???0.0017 | ????0.24 | ???0.0019 |
Table 20 magnetic measurement result
| Having or not of skin-pass | Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention of the present invention | Do not have | ????0.11 ????0.16 ????0.20 ????0.27 ????0.35 | ????1.740 ????1.739 ????1.739 ????1.715 ????1.714 | ????3.31 ????3.32 ????3.32 ????3.45 ????3.46 |
| Comparative example comparative example of the present invention of the present invention | Have | ????0.11 ????0.16 ????0.20 ????0.27 ????0.35 | ????1.722 ????1.721 ????1.720 ????1.700 ????1.699 | ????3.02 ????3.04 ????3.05 ????3.21 ????3.25 |
The 8th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 21 is heated, it is processed as the thick section bar that thickness is 40mm, after this, be processed into the material that thickness is 1.8mm by smart hot rolls by roughing mill.Under emulsion state, lubricating oil sneaked in the roll water coolant in the smart hot rolls,, frictional coefficient is adjusted by changing its mixed volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 315s
-1In addition, to slide in order preventing to produce between the steel plate and work roll when the smart hot rolling, thereby to form scar, thin slab after the roughing and last thin slab are welded, it is carried out smart hot rolling continuously at surface of steel plate.At this moment, smart hot-rolled temperature is 900 ℃, immediately to its cooling, at 500 ℃ it is reeled behind rolling the finishing.By continuous annealing furnace, at 950 ℃ the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal and reach 2 minutes.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, in early stage, it was kept 30 seconds at 1050 ℃, in the later stage, it was kept 30 seconds at 900 ℃.Then, cutting goes out the iron loss test portion, measures magnetic properties, and table 22 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
Shown in table 22, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, the hot-rolled sheet annealing conditions is suitably controlled, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 21 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0011 | ???3.01 | ???0.12 | ???0.0011 | ????0.50 | ???0.0014 |
Table 22 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention of the present invention | ????0.11 ????0.16 ????0.20 ????0.27 ????0.34 | ????1.691 ????1.690 ????1.690 ????1.671 ????1.670 | ????2.31 ????2.33 ????2.34 ????2.51 ????2.53 |
The 9th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 23 is heated, it is processed as the thick section bar that thickness is 40mm, after this, be processed into the material that thickness is 1.8mm by smart hot rolls by roughing mill.Under emulsion state lubricating oil sneaked in the roll water coolant in the smart hot rolls, by per-cent meter by volume, its mixed volume is adjusted into 4%, making frictional coefficient is 0.20.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 310s
-1Smart hot-rolled temperature is 900 ℃, immediately to its cooling, at 500 ℃ it is reeled behind rolling the finishing.By continuous annealing furnace, the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal by change anneal temperature, the mode of anneal time.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Then, cutting goes out the iron loss test portion, measures magnetic properties, and table 24 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
Shown in table 24, if make hot-rolled sheet anneal temperature in 850～1150 ℃ scope, can obtain the non-oriented electromagnetic steel sheet having of good characteristic.But, if hot-rolled sheet anneal temperature does not reach 850 ℃, then can not improve magnetic fully, bad if this temperature, can produce pickling more than 1150 ℃, thus the surface property of finished product can variation, and core loss value is bigger.
In addition, know that the hot-rolled sheet anneal time of adopting the continuous annealing processing mode then obtains good magnetic in 20 seconds～5 minutes scope.The hot-rolled sheet anneal time of adopting the continuous annealing processing mode in the occasion more than 5 minutes, it is bad to produce pickling, core loss value can increase on the contrary.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, the hot-rolled sheet annealing conditions is suitably controlled, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 23 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | ?????O |
| ??0.0009 | ???3.00 | ???0.11 | ??0.0008 | ????0.65 | ??0.0008 | ???0.0005 |
Table 24 magnetic measurement result
| Hot-rolled sheet anneal temperature (℃) | The hot-rolled sheet anneal time (second) | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | Remarks | |
| Comparative example is of the present invention | ????800 ????870 ????950 | ????120 ????120 ????120 | ????1.671 ????1.689 ????1.692 | ????2.58 ????2.37 ????2.31 |
| Comparative example of the present invention | ????1050 ????1200 | ???120 ???120 | ????1.690 ????1.688 | ????2.33 ????2.42 | The generation pickling is bad |
| Comparative example comparative example of the present invention of the present invention | ????900 ????900 ????900 ????900 ????900 | ???10 ???30 ???90 ???180 ???360 | ????1.645 ????1.682 ????1.689 ????1.690 ????1.688 | ????2.51 ????2.35 ????2.34 ????2.31 ????2.43 | The generation pickling is bad |
The 10th embodiment
With general method, the non-oriented electromagnetic steel sheet having that will have the composition shown in the table 25 is heated to 1200 ℃, by roughing mill it is processed as the thick section bar that thickness is 30mm, after this, is processed into the material that thickness is 1.8mm by smart hot rolls.Under emulsion state, lubricating oil sneaked in the roll water coolant in the smart hot rolls,, change average friction coefficient by adjusting its mixed volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The maximum distortion speed at last frame place is 175s
-1Smart hot-rolled temperature is 1000 ℃, immediately to its cooling, at 650 ℃ it is reeled behind rolling finishing.After this, making the plate temperature is 300 ℃, and this plate is rolled into the material that thickness is 0.85mm, in addition it is carried out 980 ℃, and 30 seconds process annealing is handled, and then, warm rolling by 200 ℃ is processed into the material that thickness is 0.25mm, and it is carried out pickling.By continuous annealing furnace, it was kept 30 seconds at 850 ℃, thereby carry out anneal, be 8% skin-pass by the calendering rate, be processed into the material that thickness is 0.23mm.Then, cutting goes out the iron loss test portion, 800 ℃ of anneal of carrying out 2 hours generation distortion, measures magnetic properties afterwards.Table 26 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
Shown in table 26, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, the hot-rolled sheet annealing conditions is suitably controlled, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 25 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ????P | ????N | ???sol-Al |
| ??0.0015 | ???6.51 | ???0.15 | ??0.0010 | ???0.007 | ??0.0015 | ????0.025 |
Table 26 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B8 (T) | Iron loss W10/50 (W/kg) | Iron loss W10/400 (W/kg) |
| Comparative example comparative example of the present invention | ????0.19 ????0.22 ????0.29 ????0.34 | ????1.422 ????1.420 ????1.400 ????1.399 | ????0.53 ????0.55 ????0.63 ????0.65 | ????6.95 ????7.05 ????8.21 ????8.30 |
The 11st embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 27 is heated, it is processed as the thick section bar that thickness is 40mm, after this, be processed into the material that thickness is 2.0mm by smart hot rolls by roughing mill.Under emulsion state, lubricating oil sneaked in the roll water coolant in the smart hot rolls,, its mixed volume is changed in 0.2～13% scope, frictional coefficient is adjusted by per-cent meter by volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.At this moment, smart hot rolling outlet temperature is 900 ℃.The Deformation velocity at last frame place is 315s
-1By the pack annealing stove, at 800 ℃ the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal and reach 5 hours.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, the channel-section steel material at 900 ℃, is carried out anneal and reaches 30 seconds, the joist steel material is carried out anneal at 980 ℃ reach 30 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties, and table 28 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 27 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | |
| Channel-section steel | ??0.0018 | ???2.02 | ???0.12 | ??0.0016 | ????0.25 | ??0.0018 |
| Joist steel | ??0.0017 | ???3.00 | ???0.13 | ??0.0018 | ????0.45 | ??0.0015 |
Table 28 magnetic measurement result
| Channel-section steel | Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) |
| Comparative example comparative example of the present invention of the present invention | ????0.15 ????0.19 ????0.22 ????0.29 ????0.35 | ????1.743 ????1.742 ????1.740 ????1.720 ????1.719 | ????3.28 ????3.29 ????3.30 ????3.41 ????3.42 |
| Joist steel | Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) |
| Comparative example comparative example of the present invention of the present invention | ?????0.16 ?????0.19 ?????0.23 ?????0.29 ?????0.34 | ?????1.698 ?????1.697 ?????1.697 ?????1.677 ?????1.676 | ?????2.60 ?????2.61 ?????2.62 ?????2.81 ?????2.88 |
The 12nd embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 29 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls,, its mixed volume is changed in 0.2～8% scope, frictional coefficient is adjusted by per-cent meter by volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 320s
-1At this moment, smart hot rolling outlet temperature is 1000 ℃, at 850 ℃, it is reeled, and coiled material is packed in the holding furnace, 850 ℃ of anneal of carrying out 1 hour own.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 45 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 30 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, apply suitable annealing conditions own, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 29 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0022 | ???2.10 | ???0.12 | ???0.0019 | ????0.22 | ???0.0021 |
Table 30 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example of the present invention | ????0.16 ????0.20 ????0.27 | ????1.722 ????1.720 ????1.700 | ?????3.38 ?????3.41 ?????3.52 |
| Comparative example | ????0.35 | ????1.699 | ????3.55 |
The 13rd embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 31 is heated, it is processed as the thick section bar that thickness is 55mm, after this, be processed into the material that thickness is 2.0mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls,, change frictional coefficient by its mixed volume is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 310s
-1In addition, to slide in order preventing to produce between the steel plate and work roll when the smart hot rolling, thereby to form scar, thin slab after the roughing and last thin slab are welded, carry out smart hot rolling continuously at surface of steel plate.Smart hot-rolled temperature is 990 ℃, at 880 ℃, it is reeled, and coiled material is packed in the holding furnace immediately, 850 ℃ of anneal of carrying out 1 hour own.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, kept 30 seconds at 1050 ℃, carry out anneal.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 32 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
Shown in figure 32, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, apply suitable annealing conditions own, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 31 is supplied with the examination material component
| ????C | ???Si | ???Mn | ????S | ?sol-Al | ?????N |
| ??0.0013 | ??3.05 | ??0.11 | ??0.0017 | ??0.40 | ???0.0018 |
Table 32 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.16 ????0.22 ????0.27 ????0.34 | ????1.678 ????1.677 ????1.663 ????1.662 | ????2.44 ????2.46 ????2.62 ????2.65 |
The 14th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 33 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls, by per-cent meter by volume its mixed volume is adjusted to 2.5%, making average friction coefficient is 0.21.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.Under condition shown in Figure 34, to carrying out anneal own through the coiled material after the hot rolling.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, at 980 ℃ it is carried out anneal and reach 45 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 34 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
As shown in figure 34, if anneal temperature own in 750～1000 ℃ scope, can obtain the non-oriented magnetic plate of good characteristic.In the manner described above, when anneal temperature own did not reach 750 ℃, the improvement of magnetic was inadequate, when the coiling temperature of coiled material is brought up to more than 1000 ℃, departed from owing to can take place to reel, and it is impossible itself annealing like this.
In addition, know, if the anneal time own in 5 minutes～5 hours scope, then can obtain good magnetic.Hot-rolled sheet anneal time of the anneal mode of employing own in the occasion more than 5 hours, it is bad to produce pickling, core loss value increases on the contrary.
In the manner described above, if the average friction coefficient during smart hot rolling is reduced to below 0.25, apply suitable annealing conditions own, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 33 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ????N | ?????O |
| ??0.0015 | ???3.01 | ???0.12 | ??0.0018 | ????0.61 | ??0.0019 | ???0.0005 |
Table 34 magnetic measurement result
| The coiling temperature (℃) | Anneal temperature own (℃) | The own anneal time (branch) | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | Remarks | |
| Comparative example the present invention of the present invention | ???730 ???830 ???870 ???920 | ????700 ????800 ????850 ????900 | ????60 ????60 ????60 ????60 | ????1.662 ????1.676 ????1.681 ????1.680 | ????2.69 ????2.49 ????2.43 ????2.41 |
| Comparative example comparative example of the present invention of the present invention | ???880 ???880 ???880 ???880 ???880 | ???850 ???850 ???850 ???850 ???850 | ???3 ???30 ???60 ???90 ???400 | ????1.644 ????1.679 ????1.681 ????1.682 ????1.678 | ???2.75 ???2.46 ???2.45 ???2.42 ???2.57 | The generation pickling is bad |
The 15th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 35 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls, by make its mixed volume by volume per-cent in 0.2～12% scope, change, frictional coefficient is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.At this moment, smart hot rolling outlet temperature is 950 ℃, and the Deformation velocity at last frame place is 310s
-1At 850 ℃, coiled material is reeled, coiled material is packed in the holding furnace immediately, 850 ℃ of anneal of carrying out 1 hour own.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 36 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, apply suitable annealing conditions own, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 35 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0019 | ???2.50 | ???0.20 | ???0.0014 | ????0.25 | ???0.0017 |
Table 36 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.16 ????0.22 ????0.27 ????0.35 | ????1.722 ????1.721 ????1.700 ????1.699 | ????3.04 ????3.05 ????3.21 ????3.22 |
The 16th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 37 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.With lubricating oil in emulsion state is sneaked into roll water coolant in the smart hot rolls, by make its mixed volume by volume per-cent in 0.2～4% scope, change, frictional coefficient is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 320s
-1At this moment, smart hot rolling outlet temperature is at 1020 ℃, and no water injection time is 3.5 seconds, at 650 ℃, it is reeled.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 38 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, set suitable no water injection time, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 37 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ????S | ???sol-Al | ?????N |
| ???0.0019 | ???2.05 | ???0.13 | ??0.0017 | ????0.23 | ???0.0018 |
Table 38 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.19 ????0.22 ????0.27 ????0.35 | ????1.721 ????1.719 ????1.703 ????1.702 | ????3.08 ????3.10 ????3.33 ????3.36 |
The 17th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 39 is heated, it is processed as the thick section bar that thickness is 55mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Under emulsion state, lubricating oil sneaked in the roll water coolant in the smart hot rolls,, change average friction coefficient by its mixed volume is adjusted.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.In addition, to slide in order preventing to produce between the steel plate and work roll when the smart hot rolling, thereby to form scar, thin slab after the roughing and last thin slab are welded, it is carried out smart hot rolling continuously at surface of steel plate.The Deformation velocity at last frame place is 305s
-1Hot rolling precision work temperature is 1050 ℃, and no water injection time is 3 seconds, carries out water filling afterwards, and it is cooled off, and at 680 ℃ it is reeled.
Then, it is carried out pickling, be processed into the material that thickness is 0.35mm by cold rolling mode.By continuous annealing furnace, in early stage, it was kept 10 seconds at 1050 ℃, in the later stage, it was kept 30 seconds at 900 ℃.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 40 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
As shown in figure 40, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, the Deformation velocity of at least 1 mill train is at 150s
-1More than, set suitable no water injection time, can obtain following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 39 is supplied with the examination material component
| ????C | ????Si | ????Mn | ????S | ???sol-Al | ?????N |
| ??0.0017 | ???3.04 | ???0.12 | ??0.0019 | ????0.25 | ???0.0017 |
Table 40 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention | ????0.19 ????0.21 ????0.26 ????0.32 | ????1.679 ????1.678 ????1.664 ????1.663 | ?????2.43 ?????2.45 ?????2.63 ?????2.66 |
The 18th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 41 is heated, it is processed as the thick section bar that thickness is 50mm, after this, be processed into the material that thickness is 2.5mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls, by the precentagewise meter its mixed volume is adjusted to 3%, making average friction coefficient is 0.22.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.The Deformation velocity at last frame place is 270s
-1Hot rolling precision work temperature remains on 1050 ℃, changes no water injection time, and the coiling temperature remains on 680 ℃.In this occasion, the no water injection time that satisfies the formula (2) among the present invention is in 1.2～7.2 seconds scope.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 42 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
As shown in figure 42, know,, then can obtain good magnetic if do not have water injection time more than 1.2 seconds.
In the manner described above, if the average friction coefficient when making smart hot rolling reduces, and Deformation velocity is suitably controlled, can be obtained following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 41 is supplied with the examination material component
| ????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ??0.0018 | ???2.10 | ???0.11 | ???0.0019 | ????0.26 | ???0.0018 |
Table 42 magnetic measurement result
| No water injection time (second) | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example the present invention of the present invention | ????0.5 ????2.0 ????4.0 ????6.0 | ????1.665 ????1.722 ????1.725 ????1.727 | ????3.86 ????3.40 ????3.39 ????3.37 |
The 19th embodiment
With general method the non-oriented electromagnetic steel sheet having with the composition shown in the table 43 is heated, it is processed as the thick section bar that thickness is 35mm, after this, be processed into the material that thickness is 2.0mm by smart hot rolls by roughing mill.Lubricating oil is sneaked in the roll water coolant in the smart hot rolls,, frictional coefficient is adjusted by changing its mixed volume.Average friction coefficient is by to calculating in the advancing slip value of each frame actual measurement, and obtain according to its mean value.At this moment, smart hot rolling outlet temperature is 900 ℃, immediately it is sharply cooled off, and at 600 ℃ it is reeled.By continuous annealing furnace, at 850 ℃ the hot-rolled sheet that is obtained is carried out the hot-rolled sheet anneal and reach 2 minutes.
Then, it is carried out pickling, be processed into the material that thickness is 0.50mm by cold rolling mode.By continuous annealing furnace, at 900 ℃ it is carried out anneal and reach 30 seconds.Afterwards, cutting goes out the iron loss test portion, measures magnetic properties.Table 44 has provided the magnetic measurement result of the present invention and comparative example simultaneously.
In the manner described above, if the average friction coefficient when making smart hot rolling is reduced to below 0.25, and Deformation velocity is suitably controlled, can be obtained following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Table 43 is supplied with the examination material component
| ?????C | ????Si | ????Mn | ?????S | ???sol-Al | ?????N |
| ???0.0019 | ???1.10 | ???1.30 | ???0.0017 | ????0.24 | ???0.0017 |
Table 44 magnetic measurement result
| Smart hot rolling average friction coefficient | Magneticflux-density B50 (T) | Iron loss W15/50 (W/kg) | |
| Comparative example comparative example of the present invention of the present invention | ????0.11 ????0.16 ????0.20 ????0.27 ????0.35 | ????1.755 ????1.754 ????1.752 ????1.732 ????1.730 | ????3.35 ????3.37 ????3.39 ????4.15 ????4.21 |
If implement the present invention in the manner described above, can make following non-oriented electromagnetic steel sheet having, it is higher that this steel plate has flux density value, the excellent magnetic that core loss value is lower.
Claims (10)
1. high magnetic flux density, the manufacture method of the non-oriented electromagnetic steel sheet having of low iron loss, this method comprises the steps:
Adopt and in steel, contain by weight percentage:
1.00％＜Si≤7.00％
0.10％≤Mn≤1.50％
C≤0.0050％
N≤0.0050％
S≤0.0050％
The blank that its remainder is made of Fe and unavoidable impurities carries out hot rolling to it, forms hot-rolled sheet, and it is carried out 1 time or accompany the cold rolling step more than 2 times of process annealing treatment step, then carries out smart anneal;
Hot-rolling roll when it is characterized in that smart hot rolling and the average friction coefficient between the steel plate are below 0.25.
2. a magneticflux-density is higher, the manufacture method of the non-oriented electromagnetic steel sheet having that iron loss is lower, and this method comprises the steps:
Adopt and in steel, contain by weight percentage:
1.00％＜Si≤7.00％
0.10％≤Mn≤1.50％
C≤0.0050％
N≤0.0050％
S≤0.0050％，
The blank that its remainder is made of Fe and unavoidable impurities carries out hot rolling to it, forms hot-rolled sheet, and it is carried out 1 time or accompany the cold rolling step more than 2 times of process annealing treatment step, then carries out smart anneal;
It is characterized in that:
Average friction coefficient during the essence hot rolling between hot-rolling roll and the steel plate is below 0.25;
With regard to smart hot rolling, the Deformation velocity of at least 1 mill train is at 150s
-1More than.
3. according to the manufacture method of the non-oriented electromagnetic steel sheet having of claim 1 or 2 described high flux density low iron loss, it is characterized in that in steel by weight percentage, also contain Al, its content is: 0.10%≤Al≤2.00%.
4. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～3, it is characterized in that after smart hot rolling finishes, before cold rolling, according in 850～1150 ℃ temperature range, continuous annealing processing mode in 20 seconds～5 minutes time range is carried out the hot-rolled sheet anneal.
5. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～3, it is characterized in that after smart hot rolling finishes, before cold rolling, according in 750～850 ℃ temperature range, pack annealing processing mode in 5 minutes～30 hours time range is carried out the hot-rolled sheet anneal.
6. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～3, it is characterized in that after smart hot rolling finishes, in 750～1000 ℃ temperature range, be wound into coiled material, in 5 minutes～5 hours time range, the heat that keeps by coiled material itself carries out anneal own.
7. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～3, it is characterized in that smart relatively hot rolling outlet temperature T (℃), during the time t (second) that meets the following formula after hot rolling finishes, do not carry out water filling, the coiling coiled material, this formula is:
950≤T (℃)≤1150 ... formula (1)
9.6-8 * 10
-3T≤t (second)≤15.6-8 * 10
-3T ... formula (2).
8. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～7, it is characterized in that after carrying out smart anneal, also carry out the step of 2～20% skin-pass.
9. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～8, it is characterized in that when smart hot rolling, as lubricant, the lubricating oil of per-cent in 0.5～20% scope is by volume sneaked in the hot-rolling roll water coolant.
10. according to the manufacture method of the non-oriented electromagnetic steel sheet having of the described high flux density low iron loss of claim 1～9, it is characterized in that, the thin slab after the roughing is engaged with last thin slab before the smart hot rolling, this thin slab is carried out smart hot rolling continuously.
Applications Claiming Priority (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP316870/95 | 1995-12-05 | ||
| JP31687095 | 1995-12-05 | ||
| JP34504495 | 1995-12-08 | ||
| JP345044/95 | 1995-12-08 | ||
| JP218096/96 | 1996-08-01 | ||
| JP21809696A JP4191806B2 (en) | 1995-12-08 | 1996-08-01 | Method for producing non-oriented electrical steel sheet |
| JP20606496 | 1996-08-05 | ||
| JP206064/96 | 1996-08-05 | ||
| JP321886/96 | 1996-12-02 | ||
| JP8321886A JPH10102147A (en) | 1995-12-05 | 1996-12-02 | Production of nonoriented silicon steel sheet with high magnetic flux density and low iron loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1203635A true CN1203635A (en) | 1998-12-30 |
Family
ID=27529394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96198854A Pending CN1203635A (en) | 1995-12-05 | 1996-12-05 | Process for producing non-oriented electromagnetic steel sheet having high magnetic flux density and low iron loss |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0875586A1 (en) |
| KR (1) | KR19990071916A (en) |
| CN (1) | CN1203635A (en) |
| AU (1) | AU700333B2 (en) |
| WO (1) | WO1997020956A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218362B (en) * | 2005-07-07 | 2010-05-12 | 住友金属工业株式会社 | Non-oriented electromagnetic steel sheet and its manufacturing method |
| CN103930584A (en) * | 2011-11-09 | 2014-07-16 | 杰富意钢铁株式会社 | Ultrathin electromagnetic steel sheet |
| CN105779879A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Production method for cold-rolled non-oriented electrical steel thin belt |
| CN105779728A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Hot rolling method for non-oriented electrical steel thin strip |
| CN109477186A (en) * | 2016-07-29 | 2019-03-15 | 杰富意钢铁株式会社 | The manufacturing method of orientation electromagnetic steel plate hot rolled steel plate and its manufacturing method and orientation electromagnetic steel plate |
| CN116555532A (en) * | 2023-03-31 | 2023-08-08 | 宝镁特(上海)智能工程有限公司 | High-precision annealing method for thin silicon steel material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2021012533A (en) * | 2019-04-22 | 2021-11-12 | Jfe Steel Corp | Method for producing non-oriented electrical steel sheet. |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5476422A (en) * | 1977-11-30 | 1979-06-19 | Nippon Steel Corp | Manufacture of non-oriented electrical sheet with superior magnetism by self annealing of hot rolled sheet |
| JPS6254023A (en) * | 1985-08-31 | 1987-03-09 | Nippon Steel Corp | Manufacture of high-grade nonoriented electrical steel sheet |
| JPH01306524A (en) * | 1988-06-04 | 1989-12-11 | Kobe Steel Ltd | Production of non-oriented electrical sheet having high magnetic flux density |
| JPH0723509B2 (en) * | 1988-10-13 | 1995-03-15 | 新日本製鐵株式会社 | Manufacturing method of non-oriented electrical steel sheet having excellent iron loss characteristics |
| JP2790730B2 (en) * | 1990-12-26 | 1998-08-27 | 川崎製鉄株式会社 | Manufacturing method of high carbon steel sheet with excellent material uniformity |
| JP3375998B2 (en) * | 1993-01-26 | 2003-02-10 | 川崎製鉄株式会社 | Manufacturing method of non-oriented electrical steel sheet |
-
1996
- 1996-12-05 AU AU14363/97A patent/AU700333B2/en not_active Ceased
- 1996-12-05 WO PCT/JP1996/003570 patent/WO1997020956A1/en not_active Application Discontinuation
- 1996-12-05 KR KR1019980704203A patent/KR19990071916A/en not_active Application Discontinuation
- 1996-12-05 CN CN96198854A patent/CN1203635A/en active Pending
- 1996-12-05 EP EP96941184A patent/EP0875586A1/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101218362B (en) * | 2005-07-07 | 2010-05-12 | 住友金属工业株式会社 | Non-oriented electromagnetic steel sheet and its manufacturing method |
| US7922834B2 (en) | 2005-07-07 | 2011-04-12 | Sumitomo Metal Industries, Ltd. | Non-oriented electrical steel sheet and production process thereof |
| CN103930584A (en) * | 2011-11-09 | 2014-07-16 | 杰富意钢铁株式会社 | Ultrathin electromagnetic steel sheet |
| CN103930584B (en) * | 2011-11-09 | 2016-08-31 | 杰富意钢铁株式会社 | Very thin electromagnetic steel plate |
| US9666350B2 (en) | 2011-11-09 | 2017-05-30 | Jfe Steel Corporation | Ultrathin electromagnetic steel sheet |
| CN105779879A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Production method for cold-rolled non-oriented electrical steel thin belt |
| CN105779728A (en) * | 2014-12-23 | 2016-07-20 | 鞍钢股份有限公司 | Hot rolling method for non-oriented electrical steel thin strip |
| CN109477186A (en) * | 2016-07-29 | 2019-03-15 | 杰富意钢铁株式会社 | The manufacturing method of orientation electromagnetic steel plate hot rolled steel plate and its manufacturing method and orientation electromagnetic steel plate |
| CN109477186B (en) * | 2016-07-29 | 2020-11-27 | 杰富意钢铁株式会社 | Hot-rolled steel sheet for grain-oriented electrical steel sheet, method for producing same, and method for producing grain-oriented electrical steel sheet |
| CN116555532A (en) * | 2023-03-31 | 2023-08-08 | 宝镁特(上海)智能工程有限公司 | High-precision annealing method for thin silicon steel material |
| CN116555532B (en) * | 2023-03-31 | 2024-04-09 | 宝镁特(上海)智能工程有限公司 | High-precision annealing method for thin silicon steel material |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0875586A4 (en) | 1998-11-04 |
| AU1436397A (en) | 1997-06-27 |
| WO1997020956A1 (en) | 1997-06-12 |
| EP0875586A1 (en) | 1998-11-04 |
| AU700333B2 (en) | 1998-12-24 |
| KR19990071916A (en) | 1999-09-27 |
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