CN103748240A - Method for producing a grain-oriented electrical steel flat product intended for electrotechnical applications - Google Patents
Method for producing a grain-oriented electrical steel flat product intended for electrotechnical applications Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- 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
- C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
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- 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
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- 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
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- 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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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Abstract
The invention relates to a method for producing a grain-oriented flat steel product for electrotechnical applications, in which a melt is cast into a strand, a thin slab is divided from the cast strand, the thin slab is heated and hot-rolled into a warm strip, the warm strip is cooled, coiled and cold-rolled into a cold strip, the cold strip undergoes decarburizing and nitriding annealing, an annealing separator is applied to the surface of the cold strip and the cold strip undergoes final annealing to obtain a distinctive cast texture. The working step of "decarburizing and nitriding annealing" is carried out in two stages, wherein the first annealing stage, which comprises heating the cold strip from a starting temperature to a first desired annealing temperature and keeping it at this desired annealing temperature, extends over a first time interval and the second annealing stage, in which the cold strip is heated to a second desired annealing temperature and is subsequently kept at this desired annealing temperature, extends over a second time interval. The first desired annealing temperature is 10 - 50 DEG C lower than the second desired annealing temperature and the duration of the first time interval is 30 - 70% of the overall duration of the annealing treatment comprising the first and second time intervals.
Description
Technical field
The present invention relates to a kind of manufacture grain-oriented, for the method for electrician's flat product of electrician's purposes.At actual central this class electrician flat product, have another name called for grain-oriented " electrical sheet " or grain-oriented " electrician's belt steel ".
Background technology
Grain-oriented electrician's flat product has special magnetic and must make by expensive production process.The basic material of electrician's flat product is silicon steel sheet.Wherein the deformation extent of the metallurgical performance of this material, the operation of rolling and the parameter of heat treatment step are coordinated mutually, thereby complete the recrystallization process of expectation.This recrystallization process causes this material uniqueness " goss texture ", and in this texture, the rolling direction of the easiest magnetized direction and finished strip is consistent.
Electrician's flat product is different with the grain-oriented electrical sheet of mentioning here or electrician's belt steel, and in electrician's flat product, crystal grain is not significantly orientated.In the electrician's belt steel being orientated at this non grain or electrical sheet, magnetic flux is not fixed on specific direction, therefore forms in all directions identical magnetic (isotropy magnetization).
In contrast, grain-oriented electrician's belt steel or the electrical sheet mentioned here have highly anisotropic magnetic.This is owing to the consistent orientation of particle in structure (crystal grain).By grain growing that carry out according to correlation method in process of production, effective, select to obtain this crystallography texture.The object of doing is like this, obtains electrician's flat product in production process after the final annealing finally carrying out, and in this electrician's flat product, crystal grain has few dislocation and therefore has the texture of near ideal.
Grain-oriented electrician's belt steel is specially adapted to magnetic to require extra high application, for example, when structure transformer, just have this situation.
Known more method is used for manufacturing highly grain-oriented electrical sheet.
According to the what is called " low-temperature heat method " of describing in EP 0 910 676 B1 can produce have optimum performance distribute, hypertonicity, grain-oriented electrical sheet.The feature of this method is that slab heating temperature is lower than 1250 ℃.By this relatively low temperature, in the high-temperature annealing step of carrying out when production process finishes, melt completely to the aluminium nitride of fused solution and can only partly melt and can again separate.Therefore the electrician's belt steel generating after low thermal process is than have weak interior the inhibition by the material making through the traditional technology of high temperature heating of plate blank.
The object of particle inhibitor is to suppress the grain growing in cold rolled strip original structure after decarburizing annealing He during decarburizing annealing.In the temperature range of 950-1100 ℃, in check exaggerated grain growth is only carried out in final high-temperature annealing process, in this annealing process, cold rolled strip is annealed at the temperature of the highest 1200 ℃, thereby realize, there is the sharp degree of Gauss's orientation [001] texture (110), high.
In order to there is exaggerated grain growth highly-textured sharp degree, best, must after decarburizing annealing, between motivating force and restorer, adjust desirable equilibrium state.Impelling the motivating force of grain growing in high-temperature annealing process is the crystal boundary energy being stored in structure.This crystal boundary energy is determined by the grain-size after primary recrystallization substantially.
Because inherence weak in low-temperature heat method process suppresses, make initial grain mean sizes after decarburizing annealing than large in traditional method and be subject to larger fluctuation by process of cooling.Therefore impel the motivating force of exaggerated grain growth conventionally smaller.On the other hand, the restorer of opposing exaggerated grain growth is determined by the non magnetic precipitate (inhibitor) of separating out in cold rolled strip.Produce thus the particle of many fine distribution.But in low-temperature heat method, main particle is not to generate in hot rolled strip, but before decarburizing annealing, generate in diversified nitriding process process afterwards or in process or in the heating phase of final annealing.
According to regulating in this wise inhibition strength Iz through course of hot rolling by nitride and sulfide in EP 0 950 119 B1 and the described method of EP 0 950 120 B1, that is, even if a grain growing in process of cooling is also suppressed under comparatively high temps.Therefore before hot rolling by the temperature of heating of plate blank to 1100 ℃-1320 ℃.At the temperature of 850 ℃-1050 ℃, containing in the atmosphere of ammonia and the nitriding treatment that simultaneously carries out of decarburizing annealing can directly form aluminium nitride.With respect to traditional manufacture method for the production of grain-oriented electrical band steel, do not need the high temperature annealing after adjusting.
On the contrary, in the described method of EP 0 219 611 B1 after primary recrystallization, but starting before exaggerated grain growth to carry out nitrogenize.Here can be by having the atmosphere of nitrogenize ability or completing nitrogenize by the protection additive that adheres to that nitrogen is provided.
Particularly nitriding temperature lower than 850 ℃, by containing in the method for ammonia atmosphere, after nitrogenize, nitrogenize silicomanganese is near surface (the Materials Science Forum Materials science 204-206(1996 of forum), 143-154 page).Because nitrogenize silicomanganese has weak thermodynamic stability, so they can fusing in the heating phase of high temperature annealing.Then, nitrogen is diffused in steel matrix and with free aluminium wherein and reassembles into aluminium nitride (the Materials Science Forum Materials science 204-206(1996 of forum), 593-598 page).Therefore it is effective inhibitor that the aluminium nitride generating is like this grown for subgrain.Although with manufacture inhibition in the conventional procedure of grain-oriented electrical steel sheet compare this rejection ratio a little less than, this inhibition makes under comparatively high temps fully secondary recrystallization and in finished strip, has larger subgrain size (TMS Proceedings TMS minutes 3(2008), 49-54 page).
But the defect of this technique is, need to improve the Time-temperature cycle of high temperature annealing.At the temperature of 700-800 ℃, by nitrogen, spread and carry out the fusing of silicon nitride manganese and newly form AlN.In order fully to realize this crucial processing step, in the operating process of preceding method, must in the heating phase of high temperature annealing, carry out the maintenance isothermal stage of at least four hours.This has not only caused the overall process time length obviously to extend, and has also caused the cost up in production process.
Except aforesaid prior art, known a kind of for the manufacture of method highly grain-oriented, electrician's belt steel based on bar strip continuous casting by EP 1 752 549 A1, mutually coordinate in the method operation, to there is the electrical sheet of optimum magnetic by using traditional equipment to obtain.Wherein make every effort to avoid as much as possible forming the precipitate of nitrogenize before hot rolling He in course of hot rolling, thereby in the cooling hot-rolled process with steel, can control largely the generation of this precipitate.Specifically, first steel is melted, wherein except containing iron, also contain Si:2.5-4.0% with inevitable impurity (% illustrates with quality), C:0.02-0.10%, Al:0.01-0.065%, N:0.003-0.015%, also optionally contain the Mn that is no more than 0.30%, be no more than 0.05% Ti, be no more than 0.3% P, at S, one or more elements in Se, its total content is up to 0.04%, at As, Sn, Sb, Te, one or more elements in Bi, its content is no more than respectively 0.2%, at Cu, Ni, Cr, Co, one or more elements in Mo, its content is no more than respectively 0.5% and at B, V, one or more elements in Nb, its content is no more than respectively 0.012%.Then the fused solution mixing like this carried out in vacuum unit or ladle furnace to secondary metallurgy processing and be cast into continuously subsequently steel bar.From the steel bar obtaining like this, be partitioned into thin slab, then in the smelting furnace on a production line, this thin slab be heated to 1050 ℃-1300 ℃.Wherein the residence time in smelting furnace is up to 60 minutes.After adding hot thin slab, this thin slab is rolled into the hot rolled strip with 0.5-4.0mm thickness in hot rolling line on a line, branched.In this course of hot rolling, at the temperature of 900-1200 ℃, carry out the first moulding passage that degree of deformation is greater than 40%.In this external course of hot rolling, rolling at least two moulding passages after rolling at 900-1200 ℃ of temperature in two-phase mixing region (α-γ).Finally, in final hot-roll forming passage process, draught is up to 30%.After hot rolling by cooling the hot rolled strip generating like this and be wound in coiled material.Can or optionally carry out subsequently the annealing of hot rolled strip after being wound around before cold rolling.Then cold rolling this hot rolled strip one-tenth is there is to the cold rolled strip of 0.15mm-0.50mm final thickness.Then the cold rolled strip of generation is carried out to recrystallize and decarburizing annealing.Except decarburizing annealing, also can also be at the temperature higher than 850 ℃, containing the nitrogenize with steel in the atmosphere of NH3.After next applying annealing separating agent on the Cold-strip Steel Surface of anneal, to carry out the final annealing of recrystallize through the cold rolled strip of such coating, thereby form goss texture.Next also can also optionally make there is electrical insulating property and finally carry out without tension Annealing through the cold rolled strip of final annealing.
The importance of average grain size and variation thereof has been proposed in EP 0 378 131 B1.Except best average grain size, make the little also particularly important of deviation of the average grain size in steel plate.This owing to, so because weak inhibition Growing Process of Crystal Particles completes (the Materials Science Forum Materials science 204-206(1996 of forum), 623-628 page more uncontrollably).Therefore under unfavorable processing condition, crystal grain can not have Gauss orientation and grows, but at high temperature can not grow and be conducive to form fine grain.
Finally, in EP 0 392 534 B1, describe suitable decarburizing annealing atmosphere in detail.In the document, propose, when starting decarburizing annealing and nitrogenize annealing, must reduce pressure component p
h2O/ p
h2thereby, adjust suitable zone of oxidation.The result of the method is in high-temperature annealing process, to form satisfactorily glassy membrane.
Summary of the invention
Take aforesaid prior art as background, the object of the invention is to, a kind of method is proposed, by the method, can produce and there is equally distributed, the grain-oriented electrician's flat product of grain-size the best in simple mode.
According to the present invention by comprising that the method for step described in claim 1 and feature realizes this object.
Embody in the dependent claims favourable design of the present invention and next elaborated these favourable designs and common theory of the present invention.
According to aforesaid prior art, according to of the present invention, for the manufacture of comprising following operation for the method for the specific grain-oriented electrical flat product of electrician's purposes:
A) generate molten liquid steel, this molten steel also contains Si:2.5-4.0% except containing iron with inevitable impurity (illustrating with % by weight), C:0.02-0.1%, Al:0.01-0.065%, N:0.003-0.015%, also optionally contain respectively the Mn that is no more than 0.30%, be no more than 0.05% Ti, be no more than 0.3% P, at S, one or more elements in Se, its total content is up to 0.04%, at As, Sn, Sb, Te, one or more elements in Bi, its content is no more than respectively 0.2%, at Cu, Ni, Cr, Co, one or more elements in Mo, its content is no more than respectively 0.5% and at B, V, one or more elements in Nb, its content is no more than respectively 0.012%,
B) in continuous caster, fused solution is cast into steel bar,
C) from the steel bar being cast into, be partitioned at least one block of thin slab,
D) thin slab is heated to the temperature of 1050 ℃-1300 ℃,
E) thin slab is rolled into the hot rolled strip with 0.5-4.0mm thickness in hot rolling line,
F) cooling this hot rolled strip,
G) hot rolled strip is wound in to coiled material,
H) cold rolling hot rolled strip one-tenth is there is to the cold rolled strip of 0.15-0.50mm final thickness,
I) cold rolled strip generating is carried out to decarburizing annealing and nitrogenize annealing,
J) on the Cold-strip Steel Surface through annealing, apply annealing separating agent,
And
Thereby the cold rolled strip final annealing that k) has made to apply annealing separating agent forms goss texture.
Certainly in the process that generates electrician's flat product, can carry out extra, in tradition, prepare in grain-oriented electrician's belt steel or electrical sheet process the operation of needs conventionally.This is comprised to that for example in operation g) and the heat smoothing of the hot rolled strip annealing with a stage or multiple stages of carrying out h), cold rolled strip and apply sealing coat these can be by application with according to being undertaken by the known parameter of prior art within the scope of the method according to this invention.
Of the present invention focusing on carried out cold rolled strip decarburizing annealing and nitrogenize annealing in the process of i) " cold rolled strip generating being carried out to decarburizing annealing and nitrogenize annealing " in operation at least two stages.
Wherein according to the present invention, continue to carry out in very first time section the first annealing stage, this time period comprises that cold rolled strip is started to be heated to first object annealing temperature from starting temperature also remains on this target annealing temperature subsequently,
According to the present invention, correspondingly in the second time period, continue to carry out the second annealing stage, first cold rolled strip be heated to the second target annealing temperature in this time period and remain on subsequently this target annealing temperature.
Wherein according to the present invention first object annealing temperature than the low 10-50 ℃ of the second target annealing temperature.According to the present invention, the time length of very first time section is the 30-70% that comprises the anneal total duration of the first and second time periods simultaneously.
The present invention is based on a discovery,, by i) at least dividing " the classification annealing " that two stages carry out can generate cold rolled strip in process in operation, in this cold rolled strip on the one hand crystal grain have best average grain size and on the other hand the grain-size of single crystal grain and the deviation of average grain size little.
In the middle of actual, can realize the above results by following operation,, thereby the cold rolled strip generating after cold rolling is carried out to decarburizing annealing and nitrogenize annealing by being divided at least continuous annealing furnace in Liang Ge district continuously, in the district above passing through at first with mode Offered target annealing temperature according to the present invention, the low 10-50 ℃ of target annealing temperature in the annealing furnace Second Region that next this target annealing temperature is passed through than cold rolled strip, the time length that wherein completes the time period of the first annealing stage is the 30-70% of decarburizing annealing and nitrogenize annealing total duration.By the temperature contrast regulation according to the present invention, between the decarburizing annealing of the first and second stages and nitrogenize annealing and according to the present invention, two annealing stage specific times are suppressed to grain growing excessive, that be unfavorable for the orientation that forms goss texture.By this way, in the case of the average grain size that obtains with the annealing adjustment of carrying out in annealing furnace region by under higher anneal temperature, is below identical, the cold rolled strip structure obtaining after annealing has in the final annealing process that therefore obviously less fluctuation also can carry out under last, high temperature carries out uniform subgrain growth.
According to the method according to this invention, can make the fluctuation that occurs in the grain-size in cold-rolled process minimize.Therefore generally speaking make the fluctuation of the relative grain size distribution of result of cold-rolled process above become stable.By this way, the electrician's flat product making according to the present invention and then cold rolling, there is crystallography texture at least divide the anneal that two stages carry out according to the present invention after, by this texture, in final high-temperature annealing process, in best mode, guaranteed uniform subgrain growth.
The present invention makes the operation known according to low-temperature heat method and modern thin slab manufacture combine by this way, according to casting and rolling process known, that have continuous manufacturing feature, carries out this thin slab manufacture.Result is to provide a kind of electrician's flat product with the optimum magnetic relevant with the special purpose of grain-oriented electrical steel sheet and electrician's belt steel by operations according to the instant invention.
When mention nitrogenize annealing and the decarburizing annealing (operation i)) carried out according to the present invention here at least two stages, be not illustrated in two annealing stages and all must all the time nitrogenize and decarburization combination be carried out.But the first annealing stage carrying out according to the present invention also can be used as that the simple heating phase carries out and carry out decarburization and nitrogenize in subordinate phase.Be contemplated that equally, by two annealing stages, carry out decarburization and in further annealing steps, carry out remaining decarburization and nitrogenize subsequently.Or, can separately carry out successively decarburization and nitrogenize by least two annealing stages according to the present invention.Finally also be contemplated that, at least one annealing stage completing according to the present invention can not carry out just completing decarburization and nitrogenize in decarburization and nitrogenize and the annealing steps after two annealing stages according to the present invention.
Therefore within the scope of the present invention, in operation, can complete continuously the first and second annealing stages and carry out subsequently further annealing steps in i) in the middle of actual, in this step, making cold rolled strip carry out decarburizing annealing and nitrogenize annealing.Wherein can according to according to the present invention for annealing stage, about carry out first and second annealing stages of operation in i) in the situation of temperature grade and the first annealing stage shared time quantum and the parameter used within annealing stage total time.Then carry out further annealing steps, decarburization in a conventional manner and nitrogenize in this step.Therefore the annealing steps that completes continuously generally at least three parts under this change of the present invention in operation in i), wherein regulation parameter according to the present invention effectively and in a conventional manner completes the 3rd step that comprises nitrogenize for the first two annealing steps.
Actual test shows, when the target annealing temperature of the first annealing stage is during than the low 10-30 of target annealing temperature of the second annealing stage ℃, and the optimum performance of the electrician's flat product that obtains making according to the present invention.
When the time length of very first time section, be limited in the 30-60% of anneal total duration, favourable to the result of the annealing steps at least carrying out with two stages according to the present invention equally.
Should as quickly as possible cold rolled strip be heated to the target temperature of the first annealing stage.The first lax band steel through cold-forming in the heating phase of decarburizing annealing and nitrogenize annealing.Then start primary recrystallization.The in the situation that of comparatively high temps and longer annealing time, carry out Growing Process of Crystal Particles.For the storage power for recrystallize as much as possible is provided, should pass through fast the temperature range of relaxation.A favourable design of the present invention is provided with the heating rate of 25-500 ℃/s for this reason, with this heating rate, in the first annealing stage, cold rolled strip is heated to first object annealing temperature from starting temperature.In addition, in traditional heat-processed, heating rate is generally 30-70 ℃/s.But the optimal process result of considering particularly preferred primary recrystallization and following, arranges especially fast, the heating rate of 200-500 ℃/s can be also favourable thereupon.In the middle of reality, can in the production of carrying out continuously, realize so especially this heating rate fast,, the rapid heating of responding at the entrance of each continuous furnace, in this heat-processed by the effect heating cold rolled strip of the electromagnetic field responded in steel.
Accompanying drawing explanation
Next according to embodiment, further illustrate the present invention.Wherein:
Fig. 1 show for the electrician's belt steel (A line) of tradition annealing and according to electrician's belt steel of the present invention (B line), with the schematic diagram of the temperature progress T of annealing time t;
Fig. 2 is corresponding in annealing process according to the present invention being the time length time period t that the first annealing stage arranges
1with annealing total duration t
2ratio t
1/ t
2, show in 800A/m situation, take tesla as unit, two there is the electrical sheet S1 of different compositions, the polarizability of S2.
Embodiment
The secondary metallurgy carrying out in ladle furnace and vacuum unit in traditional continuous caster is cast into by four kinds of molten liquid steel S1-S4 with given composition in table 1 steel bar that 63mm is thick after processing continuously.
From steel bar, be partitioned into equally in a conventional manner thin slab.Carry out homogenizing annealing in the soaking pit of 1165 ℃ after, by this thin slab descaling and be rolled into the final thickness of 2.34mm and be wound in coiled material in finished product production line.
Embodiment 1:
The hot rolled strip generating in preceding method is carried out to two hot rolled strip annealing stages.Annealing temperature in the first stage of hot rolled strip annealing is 1090 ℃, and annealing temperature in subordinate phase is 850 ℃.Also can there is hot rolled strip annealing identical annealing temperature, that there is a stage, be used for replacing the hot rolled strip annealing with two stages.
After hot rolled strip annealing by the hot rolled strip through annealing with 87% degree of deformation in a stage cold rolling become the final thickness of 0.285mm.From the cold rolled strip obtaining like this, be partitioned into steel plate sample.
Make the steel plate sample of comparative group A in continuous annealing furnace, carry out continuous annealing.Wherein first in the first annealing furnace section passing through at first, at the temperature of 860 ℃, by hydrogen/nitrogen mixture (p
h2O/ p
h2=0.50) under the humid atmosphere forming, continue the annealing steps of 150 seconds.Then after the first annealing furnace section, in continuous the second annealing furnace section, under the humid atmosphere of ammonia/hydrogen/nitrogen compositions of mixtures, continue second annealing steps of 30 seconds, thereby cause residue decarburization and nitrogenize.910 ℃ of annealing temperature maintenances are constant.According to important design for practice above-mentioned, of the present invention, making according to the operation of the inventive method the annealing in i) be divided into two annealing steps carries out, the first annealing steps of wherein dividing according to the present invention carries out again in two annealing stages, after this step, as the second annealing steps, completes traditional decarburizing annealing and nitrogenize annealing.Therefore generally speaking at three, in sequential portion, complete operation i) successively.
Make the steel plate sample of second group of B first in the first annealing steps, in mode according to the present invention, in two continuous annealing stages, anneal and in two annealing steps, remain decarburization and nitrogenize subsequently with corresponding working order.Wherein to five change programme B.a with two annealing stages according to the present invention)-B.e) be studied.Wherein at process very first time section t
1in the first annealing stage completing, be provided with separately target annealing temperature T
1and in the second annealing stage, be provided with separately target annealing temperature T
2.The total duration t of two annealing stages that complete continuously in this case,
2also be 150s.In addition, the first stage of the first annealing steps comprises with the heating rate of 40 ℃/s and quickly heats up to target annealing temperature T separately
1.
In Fig. 1, for being used for electrical sheet sample sets A and one of them change programme B.a of contrast)-B.e) respectively with solid line be shown in dotted line the temperature progress with annealing time t in the annealing process of the first annealing steps.
Therefore, the first two annealing stage of the change programme of illustrational, the method according to this invention mainly plays the effect of decarburization and has optimized the gas composition relevant with decarburization and temperature here.According to temperature control, with two stages, carry out decarburizing annealing like this,, first in the front section of passing through at first, carry out lenitively decarburization, thereby avoid as much as possible crystal grain to increase, and in continuous subsequently section, continue decarburization and finish decarburization at temperature best for the efficiency of carbon rejection process.
Different, for nitrogenize, optimized the 3rd annealing stage of the method according to this invention.Marginally carried out with it residue decarburization simultaneously.Substantially by selecting best gas composition to carry out the optimization for the 3rd annealing stage of nitrogenize, but also can be by regulating temperature be optimized.Exemplarily, in Fig. 1, on a little temperature is jumped, can find out the corresponding temperature control of carrying out, this temperature is jumped and is occurred in annealing time t
2after end.
Specifically, in order to carry out according to anneal change programme B.a of the present invention)-B.e) the first annealing furnace section of continuous annealing furnace is divided into two same long temperature provinces, therefore each steel plate sample to be annealed needs respectively 75s to come by these two temperature provinces.Corresponding with it, the time length t of the first annealing stage in this test
1account for the total duration t of 150s
250%.
The first temperature province that pass through at first at each sample, the first annealing furnace section, carrying out according to changing target annealing temperature with change programme in process of the test of the present invention, and be provided with respectively constant in the second temperature province, in carrying out the process of the second annealing stage, be the target annealing temperature of 860 ℃.Two annealing stages that carry out in the first annealing furnace section of continuous annealing furnace according to the present invention respectively as the course of processing of A group steel plate sample by hydrogen/nitrogen mixture (p
h2O/ p
h2=0.50) under the humid atmosphere forming, carry out.
Then as the processing of A group comparative sample, in the second annealing furnace section the first annealing furnace section after, decarburizing annealing and the nitrogenize carried out in the humid atmosphere of ammonia/hydrogen/nitrogen compositions of mixtures 30 seconds anneal.In this process of the second annealing steps, target annealing temperature is also 910 ℃.
After annealing, use magnesium oxide coated sample and the H at 50 volume %
2n with 50 volume %
2in the annealing atmosphere of composition, carry out final annealing.
In table 2, to heat treated each change programme according to the present invention a)-e) provided in the first annealing stage the target annealing temperature T arranging respectively
1, the temperature head Δ T between first object annealing temperature and the target annealing temperature of the second annealing stage, and the polarizability J in 800A/m situation, take tesla as unit
800, and the magnetic hysteresis loss P under the polarizability of 1.7T and the frequency of 50Hz, take W/Kg as unit
1.7.Show, the electrical sheet making according to the present invention has better properties than through the sample of traditional way anneal, and and makes irrelevant according to a)-which change programme in e).
Embodiment 2:
In the foregoing manner, the hot rolled strip that fused solution 1 is made has two stage hot rolled strip annealing at 1130 ℃/900 ℃, and the hot rolled strip that fused solution 2 is made has a stage hot rolled strip annealing at 980 ℃.Then by hot rolled strip with degree of deformation thick cold rolled strip of cold rolling one-tenth 0.285mm in a stage of 87%.From the cold rolled strip obtaining, be partitioned into steel plate sample.
In this case, with compare by the A group electrical sheet sample being partitioned in cold rolled strip equally at the temperature of 840 ℃, at moist hydrogen/nitrogen mixed atmosphere (p
h2O/ p
h2=0.45) in, continue annealing 150 seconds.Then in 860 ℃, moist ammonia/hydrogen/nitrogen mixed atmosphere, carry out residue decarburizing annealing and the nitrogenize annealing of 30 seconds.Then as embodiment 1, at 910 ℃, carry out nitrogenize and residue decarburization.
According to the present invention by the sample of second group of B in same atmosphere, in the first process of continuous annealing furnace, point two stages anneal.Wherein the temperature in the first annealing furnace region is made as 810 ℃ (Δ T=30 ℃).Also show in this case five change programme B.a)-B.e).At annealing time t
1the middle target annealing temperature by the second annealing portion is brought up to 840 ℃, and this annealing time is at change programme B.a) in compare t for 120s(annealing time
1/ t
2=80%), at change programme B.b) in be 90s(t
1/ t
2=60%), at change programme B.c) in be 75s(t
1/ t
2=50%), at change programme B.d) in be 45s(t
1/ t
2=30%), and at change programme B.e) in be 30s(t
1/ t
2=20%).Then as embodiment 1, also at 910 ℃, carry out nitrogenize and residue decarburization.
Then with magnesium oxide coating electrical steel plate sample and the H at 50 volume % respectively
2n with 50 volume %
2under the annealing atmosphere of composition, carry out final annealing.
For the sample being made by fused solution 1 and 2 in mode according to the present invention, figure 2 illustrates it with according to the annealing time t of the annealing stage of the present invention
1the polarizability J changing
800.
Embodiment 3:
The hot rolled strip of fused solution 1 and 2 is annealed at 950 ℃ of hot rolled strips with a stage.Then there is the cold rolling of a stage, generate the cold rolled strip with 0.165mm final thickness.From the cold rolled strip obtaining, be partitioned into steel plate sample.
By the steel plate sample of the first group of A being partitioned in cold rolled strip at the temperature of 880 ℃, (p in moist hydrogen/nitrogen mixed atmosphere
h2O/ p
h2=0.44) annealing that continues 130 seconds.Then in 900 ℃, moist ammonia/hydrogen/nitrogen mixed atmosphere, carry out the annealing of 30 seconds.In this second annealing steps process, remain decarburization and carry out on the other hand nitrogenize on the one hand.
Under identical atmosphere, divide two stages to anneal in the steel plate sample of second group of B for the first procedure division of the continuous annealing furnace of afore-mentioned test, wherein will continue to the 70th second (t
1/ t
2～55%) the target annealing temperature in the first annealing stage process is set to 850 ℃ and the target annealing temperature from the second annealing stage that continues to the 130th second on the 70th second subsequently and is set to 880 ℃.Then as embodiment 1, also at 900 ℃, carry out respectively nitrogenize and residue decarburization.
After the anneal of electrical sheet sample, use respectively magnesium oxide coated steel plates sample and the H at 50 volume %
2n with 50 volume %
2under the annealing atmosphere of composition, carry out final annealing.
The magnetic property J of the sample of having summed up in table 3 according to the present invention and make with comparing
800and P
1.7.Here also show the superiority of the product making according to the present invention.
Embodiment 4:
By the hot rolled strip being made by fused solution 3 in the foregoing manner at 1070 ℃/950 ℃ hot rolled strip annealing with two stages and the cold rolled strips with a cold rolling one-tenth of stage with 0.215mm final thickness.From the cold rolled strip obtaining, be partitioned into steel plate sample.
At the temperature of 870 ℃, by (p in the atmosphere of moist hydrogen/nitrogen compositions of mixtures
h2O/ p
h2=0.51) annealing that the steel plate sample of first group of A is continued to 120 seconds.Then in 910 ℃, atmosphere by moist ammonia/hydrogen/nitrogen compositions of mixtures, carry out the annealing of 30 seconds, in this annealing process, remain decarburization and carry out on the other hand nitrogenize on the one hand.
According to the present invention in the first annealing steps that is divided into two stages in mode according to the present invention, in the first annealing furnace section of continuous annealing furnace used by the steel plate sample of second group of B at moist hydrogen/nitrogen mixture (p
h2O/ p
h2=0.51) in, anneal.The target annealing temperature that wherein continues to first annealing stage of the 65th second is set to 850 ℃, and the target annealing temperature that continued to second annealing stage of the 120th second from the 70th second is set to 870 ℃.In the first annealing furnace section, divide by this way after the first annealing steps that two stages complete finishes, steel plate sample is carried out to nitrogenize and residue decarburization in 910 ℃, moist ammonia/hydrogen/nitrogen mixture.
Then all steel plates are applied with magnesium oxide and at the H of 50 volume %
2n with 50 volume %
2in the annealing atmosphere of composition, carry out final annealing.
In described embodiment, the first annealing stage of the first annealing steps comprises the target annealing temperature that steel plate sample is quickly heated up to the first annealing stage as previous embodiment.In order to embody the impact of heating rate " AHR ", in described embodiment 4, in four different tests, in the situation that other is all constant, make heating rate AHR change.
(4.1:AHR=70 ℃/s of test; 4.2:AHR=150 ℃/s of test; 4.3:AHR=300 ℃/s of test; Test 4.4:AHR=500 ℃/s).
In table 4, summed up the magnetic characteristic value of the electrical sheet of such acquisition.
With % by weight or ppm by weight, illustrate;
Remaining iron and inevitably impurity
Table 1
Table 2
Table 3
Table 4
Claims (8)
1. be used for manufacturing grain-oriented, for a method for electrician's flat product of electrician's purposes, described method comprises following operation:
A) generate molten liquid steel, described molten steel except iron and inevitably impurity also contain (with % by weight, illustrating)
Si：2.5-4.0%、
C：0.02-0.1%、
Al：0.01-0.065%、
N：0.003-0.015%，
Also optionally contain
-be no more than 0.30% Mn,
-be no more than 0.05% Ti,
-be no more than 0.3% P,
-one or more elements in S, Se, its total content is up to 0.04%,
-one or more elements in As, Sn, Sb, Te, Bi, its content is no more than respectively 0.2%,
-one or more elements in Cu, Ni, Cr, Co, Mo, its content is no more than respectively 0.5%,
-one or more elements in B, V, Nb, its content is no more than respectively 0.012%,
B) in continuous caster, fused solution is cast into steel bar,
C) from the steel bar being cast into, be partitioned at least one block of thin slab,
D) thin slab is heated to 1050 ℃-1300 ℃,
E) thin slab is rolled into the hot rolled strip with 0.5-4.0mm thickness in hot rolling line,
F) cooling hot-rolled band steel,
G) hot rolled strip is wound in to coiled material,
H) cold rolling hot rolled strip one-tenth is there is to the cold rolled strip of 0.15-0.50mm final thickness,
I) cold rolled strip generating is carried out to decarburizing annealing and nitrogenize annealing,
J) on the Cold-strip Steel Surface through annealing, apply annealing separating agent,
Thereby the cold rolled strip final annealing that k) has made to apply annealing separating agent forms goss texture,
It is characterized in that,
-in operation, i) in process, cold rolled strip is annealed at least two stages,
The-the first annealing stage continues to carry out and comprises that cold rolled strip is started to be heated to first object annealing temperature from starting temperature also will remain on described target annealing temperature through the cold rolled strip of heating subsequently in very first time section,
The-the second annealing stage continues to carry out in the second time period, and wherein first cold rolled strip be heated to the second target annealing temperature and remain on subsequently described target annealing temperature,
-first object annealing temperature is than the low 10-50 ℃ of the second target annealing temperature,
And
The time length of-very first time section is the 30-70% that comprises the anneal total duration of the first and second time periods.
2. method according to claim 1, is characterized in that, first object annealing temperature is than the low 10-30 ℃ of the second target annealing temperature.
3. according to the method described in aforementioned claim any one, it is characterized in that, the time length of very first time section is the 30-60% of anneal total duration.
4. according to the method described in aforementioned claim any one, it is characterized in that, in the first annealing stage, cold rolled strip is heated to first object annealing temperature with the heating rate of 25-500 ℃/s from starting temperature.
5. method according to claim 4, is characterized in that, described heating rate is at least 200 ℃.
6. method according to claim 5, is characterized in that, inductively carries out the heating of cold rolled strip.
7. according to the method described in aforementioned claim any one, it is characterized in that, in operation, can complete continuously the first and second annealing stages and carry out subsequently further annealing steps in i), in described further annealing steps, make cold rolled strip carry out decarburizing annealing and nitrogenize annealing.
8. method according to claim 7, is characterized in that, the first and second annealing stages carry out as simple decarburizing annealing in i) in operation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011107304.7 | 2011-07-06 | ||
| DE102011107304A DE102011107304A1 (en) | 2011-07-06 | 2011-07-06 | Method for producing a grain-oriented electrical steel flat product intended for electrotechnical applications |
| PCT/EP2012/063039 WO2013004747A1 (en) | 2011-07-06 | 2012-07-04 | Method for producing a grain-oriented electrical steel flat product intended for electrotechnical applications |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103748240A true CN103748240A (en) | 2014-04-23 |
Family
ID=46508021
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280033436.XA Pending CN103748240A (en) | 2011-07-06 | 2012-07-04 | Method for producing a grain-oriented electrical steel flat product intended for electrotechnical applications |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20140261895A1 (en) |
| EP (1) | EP2729588B1 (en) |
| JP (1) | JP2014524978A (en) |
| KR (1) | KR20140044892A (en) |
| CN (1) | CN103748240A (en) |
| BR (1) | BR112014000185A2 (en) |
| DE (1) | DE102011107304A1 (en) |
| RU (1) | RU2014104074A (en) |
| WO (1) | WO2013004747A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107922987A (en) * | 2015-08-28 | 2018-04-17 | 蒂森克虏伯电工钢有限公司 | For producing the method and grain oriented electrical steel strip starting of grain oriented electrical steel strip starting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102011054004A1 (en) * | 2011-09-28 | 2013-03-28 | Thyssenkrupp Electrical Steel Gmbh | Method for producing a grain-oriented electrical tape or sheet intended for electrical applications |
| US10134514B2 (en) | 2013-02-28 | 2018-11-20 | Jfe Steel Corporation | Method for producing grain-oriented electrical steel sheet |
| DE102014104106A1 (en) * | 2014-03-25 | 2015-10-01 | Thyssenkrupp Electrical Steel Gmbh | Process for producing high-permeability grain-oriented electrical steel |
| JP6191564B2 (en) * | 2014-09-04 | 2017-09-06 | Ｊｆｅスチール株式会社 | Method for producing grain-oriented electrical steel sheet and nitriding equipment |
| US11239012B2 (en) * | 2014-10-15 | 2022-02-01 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip |
| KR101751526B1 (en) * | 2015-12-21 | 2017-06-27 | 주식회사 포스코 | Method for manufacturing grain oriented electrical steel sheet |
| KR102012319B1 (en) | 2017-12-26 | 2019-08-20 | 주식회사 포스코 | Oriented electrical steel sheet and manufacturing method of the same |
| JP7106910B2 (en) * | 2018-03-20 | 2022-07-27 | 日本製鉄株式会社 | Manufacturing method of grain-oriented electrical steel sheet |
| CN116254472B (en) * | 2022-12-08 | 2024-06-11 | 中达连铸技术国家工程研究中心有限责任公司 | Improved low-temperature high-magnetic induction oriented silicon steel and preparation method thereof |
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- 2012-07-04 EP EP20120734890 patent/EP2729588B1/en not_active Not-in-force
- 2012-07-04 US US14/130,806 patent/US20140261895A1/en not_active Abandoned
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Also Published As
| Publication number | Publication date |
|---|---|
| BR112014000185A2 (en) | 2017-02-07 |
| RU2014104074A (en) | 2015-08-20 |
| WO2013004747A1 (en) | 2013-01-10 |
| JP2014524978A (en) | 2014-09-25 |
| EP2729588A1 (en) | 2014-05-14 |
| DE102011107304A1 (en) | 2013-01-10 |
| US20140261895A1 (en) | 2014-09-18 |
| KR20140044892A (en) | 2014-04-15 |
| EP2729588B1 (en) | 2015-05-06 |
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