CN104946967B - The excellent high-silicon electrical steel of high-gradient magnetism and its manufacture method - Google Patents
The excellent high-silicon electrical steel of high-gradient magnetism and its manufacture method Download PDFInfo
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Abstract
The invention discloses the high-silicon electrical steel that a kind of high-gradient magnetism is excellent, its chemical elements in percentage by mass is：Si：5.5 7.0%；Mn：0.015 0.10%；At least one of B, Zn, Co, V, Sn, Cr, Sb, Nb, Ni, Cu, Bi, its total addition level are 0.0010 0.50%；Balance of Fe and other inevitable impurity；The microstructure of the excellent high-silicon electrical steel of the high-gradient magnetism contains B2 ordered phases or B2 ordered phases+D03The average-size d of ordered phase, wherein B2 ordered phases meets：55≤d≤exp(125×Si‑0.87)+2×103×c‑1.5, the wherein unit of d is nm, and c represents the cooldown rate in 350 850 DEG C of temperature ranges, its unit for DEG C/s, the Si in formula represents the weight/mass percentage composition of Si elements.The invention also discloses the high silicon electrical steel sheet that a kind of high-gradient magnetism is excellent, it uses high-silicon electrical steel of the present invention to be obtained.The invention also discloses the manufacture method of the high silicon electrical steel sheet, wherein, in the cooling procedure of annealing steps, it is 1 300 DEG C/s to control the cooldown rate in 350 850 DEG C of temperature ranges.
Description
Technical field
The present invention relates to a kind of Steel material and its manufacture method, more particularly to a kind of electrical sheet and its manufacture method.
Background technology
Electrical sheet is mainly used to manufacture the iron core of motor and transformer, is important soft magnetic metal in electric power, Electronic Industry
Material.Silicone content has important influence to the magnetic property of electrical sheet, and with the increase of silicone content, electrical sheet shows excellent
Soft magnet performance, especially, when the high frequency iron loss of silicone content of the silicone content more than 5.0wt.% electrical sheet higher is low, its mangneto is stretched
Close to zero, noise reduction substantially, is especially suitable for manufacture medium, high frequency motor and as transformer, Voice ＆ Video to contracting coefficient
Magnetic shielding material under magnetic head material, choking-winding and high frequency.
However, when silicone content in Steel material is more than 5wt.%, Steel material will become not only hard but also crisp so that its it is cold plus
Work performance severe exacerbation.Fig. 1 is the part binary decision tree phasor of Fe-Si alloys.It will be seen from figure 1 that working as Si>5.0wt.%,
Fe-Si alloys from the unordered phase A2 of high temperature (body centred cubic crystal, correspondence space group be Im3m) state Slow cooling when, it may occur that two
Plant solid-state phase changes：1) when temperature reaches 790 DEG C or so, from the unordered opposite B2 ordered phases of A2 (β '-CuZn type crystal structures, it is right
Answer space group Pm3m) transformation；And 2) when temperature reaches 550 DEG C or so, B2 ordered phases are further to D03Ordered phase (BiF3Type
Crystal structure, correspondence space group Fm3m) transformation.B2 and D03Ordered phase can reduce slip system quantity in alloy, hinder sliding to become
Shape, this is the basic reason for causing high-silicon electrical steel fragility.
In order to improve the processing characteristics of electrical sheet, Publication No. JP6184708A, publication date is on July 5th, 1994, title
For the Japanese documentation of " having the high silicon sheet iron of excellent room temperature processability " discloses a kind of silicon steel material high.The silicon steel high
The percent mass proportioning of each chemical element of material is：Si：5.0-7.0%, C：0.001-0.01%, Mn：0.01-0.5%,
Sol.Al：0.001-0.01%, O：0.001-0.01%, remaining is Fe and inevitable impurity.
Additionally, Publication No. JP6220590A, publication date is August in 1994 9, entitled " to have excellent processing characteristics
High-silicon electrical steel " Japanese documentation also describe a kind of high-silicon electrical steel to improve the processing characteristics of electrical sheet, its change
Study and point be by weight percent：Si：4-10%, C≤0.01%, Mn≤0.5%, P≤0.01%, S≤0.01%, Al≤
0.2%, N≤0.01%, O≤0.02wt%, surplus Fe and inevitable impurity.
Technical scheme disclosed in above-mentioned two Japanese documentations is all so that cyrystal boundary segregation by hypertonic solutions
Oxygen element content is reduced to below 30at.% to realize the control of crystal boundary and crystallite dimension.
Notification number is JP 5170037B2, and publication date is on December 10th, 2009, entitled " silicon steel plate high and its manufacturer
The Japanese documentation of method " describes a kind of silicon steel plate high.Each chemical element (wt.%) of the silicon steel plate high is：C≤
0.02%, Si：4.5-7.5%, Mn≤2.0%, Al≤3.0%, P≤0.2%, N≤0.02% and O≤0.02%, with shape
Into the precipitation of the 0.005-1.0% under 1100-1300 DEG C in liquid phase of temperature range, the Fe of surplus is miscellaneous with inevitable
Matter.
Technical scheme disclosed in above-mentioned Japanese documentation is needed using the complex chemical vapour deposition technique of step
To prepare the high-silicon electrical steel that Si contents are 4.5-7.5%, and suppress using in the 1100-1300 DEG C of liquid precipitate for producing
Crystal grain is grown up, so that the average grain size of steel plate is no more than gauge of sheet.
The content of the invention
It is an object of the invention to provide the high-silicon electrical steel that a kind of high-gradient magnetism is excellent, the electrical sheet high-frequency soft magnetic performance
It is excellent, and with excellent processing characteristics.
To achieve these goals, the present invention proposes a kind of excellent high-silicon electrical steel of high-gradient magnetism, its chemical element
Percent mass proportioning is：
Si：5.5-7.0%；
Mn：0.015-0.10%；
At least one of Zn, Co, V, Sn, Cr, Sb, Nb, Ni, Cu, Bi, B, its total addition level are 0.0010-
0.50%；
Balance of Fe and other inevitable impurity；
The microstructure of the excellent high-silicon electrical steel of the high-gradient magnetism contains B2 ordered phases or B2 ordered phases+D03In order
The average-size d of phase, wherein B2 ordered phases meets：55≤d≤exp(125×Si-0.87)+2×103×c-1.5, the wherein list of d
Position is nm, and c represents the cooldown rate in 350-850 DEG C of temperature range, its unit for DEG C/s, the Si in formula represents the matter of Si elements
Amount percentage composition.
Si contents are 5.5-7.0% in high-silicon electrical steel of the present invention, therefore during high temperature Slow cooling, meeting
There are the solid-state phase changes of unordered phase-ordered phase, therefore, microstructure of the invention contains B2 ordered phases or B2 ordered phases+D03 to be had
Sequence phase, as it was noted above, the microstructure is unfavorable for the processing characteristics of electrical sheet.However, the technical program is by inciting somebody to action
The average-size d of B2 ordered phases is controlled in 55≤d≤exp (125 × Si-0.87)+2 × 103×c-1.5In the range of, can weaken
Unordered phase to the adverse effect of orderly phase in version even is eliminated, so that electrical sheet changes significantly while magnetic property is improved
The processing characteristics of kind high-silicon electrical steel.
The design principle of each chemical element in the excellent high-silicon electrical steel of high-gradient magnetism of the present invention is：
Si:Si is the effective element for increasing resistivity and reducing iron loss.The resistance of Steel material increases as silicone content increases
Greatly, so that maximum permeability is raised, iron loss is significantly reduced, and magnetostriction coefficient reduces.In the technical program, work as Si
When content is less than 5.5%, the high-gradient magnetism improvement of electrical sheet is not obvious, if when Si contents are more than 7.0%, electrician
The processing characteristics of steel will deteriorate.Thus, it is desirable to by the Si contents in the excellent high-silicon electrical steel of high-gradient magnetism of the present invention
It is set as 5.5-7.0%.
Mn：Mn can improve the resistivity of electrical sheet.Meanwhile, Mn can also generate MnS with S reactions, to prevent along crystal boundary
The FeS of low melting point is formed, so as to avoid causing the hot-short phenomenon of Steel material, therefore, the Mn elements of addition more than 0.015% are must
Want, but, once the content of Mn elements is more than 0.10%, the intensity and hardness of Steel material will be increased, so as to be unfavorable for height
The processing characteristics of silicon electric steel.
B/Zn/Co/V/Sn/Cr/Sb/Nb/Ni/Cu/Bi：From micro- conjunction such as B, Zn, Co, V, Sn, Cr, Sb, Nb, Ni, Cu, Bi
At least select a kind of added in high-silicon electrical steel in gold element, and by total amount of adding control 0.0010-0.50% scopes it
Between, on the one hand can improve the grain boundary structure of high-silicon electrical steel, the adhesion between enhancing crystal grain prevents grain boundary fracture, another
Aspect can also be by forming tiny precipitate come crystal grain thinning tissue, so as to improve the mechanical property of high-silicon electrical steel.
Further, in the excellent high-silicon electrical steel of high-gradient magnetism of the present invention, the C in inevitable impurity
≤ 0.0055%, S≤0.0045%, P≤0.010%, N≤0.008%, Al≤0.10%.
For the technical program, inevitable impurity is mainly C, S, P, N and Al.
In the technical program, C is detrimental to the harmful element of electrical sheet magnetic, and it can cause the iron loss of electrical sheet to increase
And magnetic aging, when C content is more than 0.0055%, the electrical steel decarburization annealing time can be increased, production efficiency is reduced, therefore
It should control its content more low better as the relict element in steel.S is detrimental to the magnetic of silicon steel and having for processing characteristics
Evil element, therefore its content should be low as much as possible.P can be along Grain Boundary Segregation, if its content will aggravate height more than 0.010%
The fragility of silicon electrical steel sheet.N can form nitride in steel, and be separated out in the form of nitride so that high-silicon electrical steel it is strong
Degree increases, and increases the fragility of high-silicon electrical steel.Al is the element for increasing electrical sheet resistivity, meanwhile, Al can promote crystal grain
Grow up.For high-silicon electrical steel of the invention, crystal grain crosses conference and deteriorates its processing characteristics, therefore Al for the technical program
For be also harmful element.
Further, the excellent high-silicon electrical steel of high-gradient magnetism of the present invention, its iron loss P10/400(i.e. frequency
400Hz, core loss value under the conditions of magnetic strength 1.0T)≤6.5W/kg, B25≥1.41T。
Another object of the present invention is to provide a kind of high-gradient magnetism excellent high silicon electrical steel sheet, it possesses excellent height
Frequency soft magnet performance and excellent processing characteristics.
In order to reach foregoing invention purpose, the excellent high silicon electrical steel sheet of high-gradient magnetism disclosed in this invention is by as above
Obtained in high-silicon electrical steel mentioned by text.
Present invention also offers a kind of manufacture method of the excellent high silicon electrical steel sheet of high-gradient magnetism, the core of the manufacture method
The heart is annealing steps, and in the cooling procedure of annealing steps, it is 1- to control the cooldown rate in 350-850 DEG C of temperature range
300℃/s。
Inventor has found, in 350-850 DEG C of temperature range, if cooldown rate is less than 1 DEG C/s, the magnetic property of electrical sheet
Can be improved, but mechanical property but deteriorates, conversely, when cooldown rate is more than 300 DEG C/s, the mechanical property of electrical sheet changes
It is kind, but magnetic is but deteriorated, so, it is necessary to cooling velocity is controlled to 1-300 DEG C/s.
Preferably, it is 5-200 DEG C/s to control the cooldown rate in 350-850 DEG C of temperature range.
It is further preferable that it is 8-90 DEG C/s to control the cooldown rate in 350-850 DEG C of temperature range.
Further, in the manufacture method of the excellent high silicon electrical steel sheet of high-gradient magnetism of the present invention, above-mentioned
In annealing steps, control annealing temperature for 950-1200 DEG C, soaking time is 10-60s.
Technical scheme reduces C, S, the Mn in high silicon electrical steel sheet by the precise control to alloying component
Deng the content of element, harmful precipitate such as MnS, carbide is reduced to that must be adversely affected produced by the processing characteristics of Steel material,
And by addition microalloy element (for example, at least one of B, Zn, Co, V, Sn, Cr, Sb, Nb, Ni, Cu, Bi) in steel
To improve the grain-boundary strength of high silicon electrical steel sheet, so as to improve the processing characteristics of high silicon electrical steel sheet.In addition, technology of the invention
Scheme also uses the solid-state phase changes of the unordered opposite ordered phase in microstructure, by controlling the cooling in annealing process procedure
Speed, realizes the control to ordered phase species and size, magnetic property and processing characteristics needed for obtaining high-silicon electrical steel.Thus,
By the optimization design to each chemical element, and using the comprehensive function of each microalloy element, can with reference to rational manufacturing process
To cause the good processability of high-silicon electrical steel of the present invention and the steel plate being made from it and magnetic property is excellent.
For the technical program, because harmful precipitate such as MnS, carbide is few, and grain-boundary strength rises, because
This, the processing characteristics of the excellent high-silicon electrical steel of high-gradient magnetism of the present invention is good.In addition, silicon electricity high of the present invention
The magnetic property of work steel is excellent, especially with excellent high-frequency soft magnetic performance, its iron loss P10/400≤ 6.5W/kg, magnetic strength B25≥
1.41T。
High silicon electrical steel sheet of the present invention possesses good processing characteristics, and what it passed through that three-point bend test obtains scratches
Degree (i.e. thin plate vertical direction maximum displacement in load action BENDING PROCESS) >=10mm；Additionally, silicon high of the present invention
Electric steel plate equally has excellent magnetic property.
Processing characteristics can be obtained by the manufacture method of the excellent high silicon electrical steel sheet of high-gradient magnetism of the present invention
The good and excellent high silicon electrical steel sheet of magnetic property.
Additionally, the processing step of the manufacture method of the excellent high silicon electrical steel sheet of high-gradient magnetism of the present invention it is simple and
Efficiency high.
Brief description of the drawings
Fig. 1 is the binary decision tree phasor of Fe-Si alloys.
Fig. 2 is the structural representation of the test device for carrying out three point bending test.
Fig. 3 is the heterogeneous microstructure figure of the high silicon electrical steel sheet of embodiment A6.
Specific embodiment
Below in conjunction with brief description of the drawings and the specific embodiment high silicon electrician excellent to high-gradient magnetism of the present invention
The excellent high silicon electrical steel sheet of steel, high-gradient magnetism and its manufacture method make further explanation, but the explanation and say
It is bright improper restriction not to be constituted to technical scheme.
Embodiment A1-A10
Table 1 lists the quality of each chemical element in the excellent high silicon electrical steel sheet of high-gradient magnetism of embodiment A1-A10
Per distribution ratio.
Table 1. (wt%, balance of Fe and in addition to major impurity Elements C, S, P, N, Al and O
Other impurities element)
* note：D is the average-size of the B2 ordered phases in the microstructure of the excellent high-silicon electrical steel of high-gradient magnetism.
The high silicon electrical steel sheet of embodiment A1-A10 is obtained using following step：
(1) vacuum induction melting；
(2) hot rolling：1150-850 DEG C of hot-rolled temperature, is rolled to 2.0mm；
(3) warm-rolling：In 700-350 DEG C of interval warm-rolling, final warm-rolling plate thickness is 0.50-0.90mm；
(4) normalizing and pickling；
(5) it is cold rolling：Through multi- pass rolling, final rolling Cold Rolled Plate Thickness 0.10mm；
(6) anneal：Annealing temperature is 950-1200 DEG C, and soaking time is 10-60s, wherein in the cooled of annealing steps
Cheng Zhong, it is 1-300 DEG C/s to control the cooldown rate in 350-850 DEG C of temperature range.
It should be noted that the core of the manufacture method of the high silicon electrical steel sheet is annealing steps, other steps are used
In prior art in the art, the technical program is not particularly limited to other steps, thus this case list it is upper
Other manufacturing steps in addition to annealing steps are stated only as the exemplary illustration for implementing the technical program, is not constituted to this
The restriction of technical scheme.
Table 2 lists the specific work in annealing steps of the excellent high silicon electrical steel sheet of high-gradient magnetism of embodiment A1-A10
Skill parameter.
Table 2.
After to the sampling of the high silicon electrical steel sheet of embodiment A1-A10, contextual analysis of organization, magnetic survey and are carried out to sample at 3 points
Bend test, wherein three point bending test are used to evaluate the processing characteristics of steel plate.Fig. 2 shows the survey for carrying out three point bending test
The structure that trial assembly is put.Sample 1 is positioned on two strong points 2 with certain distance (6mm), depression bar 3 is pressed downward generation one
Individual displacement D, a downward directed force F, 3 contacts of sample are applied with the direction sample on two midpoints of the strong point 2
There is three-point bending in point, sample 1 is subject to after directed force F to bottom offset, until sample occurs when forming two equal torque
Fracture, now corresponding depression bar maximum displacement is amount of deflection.
Table 3 lists the correlation performance parameters of the excellent high silicon electrical steel sheet of high-gradient magnetism of embodiment A1-A10.
Table 3.
| Sequence number | B25(T) | P10/400(W/kg) | Amount of deflection (mm) |
| A1 | 1.418 | 5.90 | 30 |
| A2 | 1.422 | 5.85 | 25 |
| A3 | 1.423 | 5.72 | 25 |
| A4 | 1.421 | 5.64 | 30 |
| A5 | 1.429 | 5.61 | 30 |
| A6 | 1.425 | 5.63 | 27 |
| A7 | 1.427 | 5.60 | 27 |
| A8 | 1.419 | 5.66 | 26 |
| A9 | 1.425 | 5.63 | 29 |
| A10 | 1.421 | 5.62 | 28 |
From table 3 it can be seen that the magnetic strength B of the excellent high silicon electrical steel sheet of the high-gradient magnetism of embodiment A1-A1025≥
1.418T, iron loss P10/400Deflection value >=the 25mm under 5.90W/kg, three-point bend test is below, the silicon electricity high is thus illustrated
Work steel plate possesses magnetic strength high, the fine magnetic property of low iron loss, and excellent processing characteristics.
Comparative example B1-B4
In order to further prove influence of the annealing process to this case implementation result, inventor also lists comparative example below
The chemical elements in percentage by mass of B1-B4, technological parameter and performance.
Table 4 lists the percent mass proportioning of each chemical element in the high-silicon electrical steel of comparative example B1-B4.
Table 4.
| Sequence number | Si | Mn | C | S | P | N | Al | O | Other elements |
| B1 | 6.0 | 0.053 | 0.0022 | 0.0019 | 0.0041 | 0.0032 | 0.085 | 0.0019 | Cr+V:0.35 |
| B2 | 6.0 | 0.052 | 0.0021 | 0.0017 | 0.0042 | 0.0036 | 0.083 | 0.0022 | Sn+Ni:0.38 |
| B3 | 6.0 | 0.051 | 0.0023 | 0.0022 | 0.0043 | 0.0042 | 0.084 | 0.0021 | Sb+Nb:0.24 |
| B4 | 6.0 | 0.055 | 0.0020 | 0.0018 | 0.0040 | 0.0040 | 0.083 | 0.0020 | B+Cu:0.072 |
From table 4, it can be seen that the chemical elements in percentage by mass of comparative example B1-B4 is in the range of this case restriction
's.
Using with embodiment A1-A10 identicals method manufacture comparative example in electrical sheet, simply control annealing steps it is cold
But during, the cooldown rate in 350-850 DEG C of temperature range is specific as shown in table 5 not in the range of 1-300 DEG C/s.
Table 5.
After to the high silicon electrical steel sheet sampling of comparative example B1-B4, contextual analysis of organization, magnetic survey and are carried out to sample at 3 points curved
Song experiment (test device of the same three point bending test using shown in Fig. 2).
Table 6 lists the correlation performance parameters of comparative example B1-B4.
Table 6.
| Sequence number | d*(nm) | B25(T) | P10/400(W/kg) | Amount of deflection (mm) |
| B1-1 | 2054 | 1.532 | 9.96 | 6 |
| B1-2 | 40 | 1.415 | 13.89 | 18 |
| B2-1 | 1950 | 1.550 | 9.85 | 7 |
| B2-2 | 45 | 1.431 | 13.21 | 19 |
| B3-1 | 1985 | 1.558 | 9.76 | 5 |
| B3-2 | 48 | 1.441 | 13.26 | 19 |
| B4-1 | 2100 | 1.562 | 9.74 | 8 |
| B4-2 | 50 | 1.435 | 13.33 | 21 |
* note：D is the average-size of the B2 ordered phases in the microstructure of the excellent high-silicon electrical steel of high-gradient magnetism.
From the contrast of table 6 and table 1 as can be seen that is listed in the average-size of the B2 ordered phases listed in table 6 and table 1 is inclined
Difference is larger, for table 1, the average-size of the B2 ordered phases in table 6 be not it is excessive be exactly too small.Additionally, may be used also from table 6
To find out, if the cooldown rate in 350-850 DEG C of temperature range is less than 1 DEG C/s, although magnetic property is still preferable, but three
Deflection value under point bend test is substantially relatively low, illustrates that the processing characteristics of electric steel plate deteriorates；And if 350-850 DEG C of humidity province
Interior cooldown rate is higher than 350 DEG C/s, although the deflection value under three point bending test is higher, but iron loss is significantly raised,
Magnetic strength is also reduced, and illustrates that magnetic property is deteriorated.
Fig. 3 shows the microstructure of the high silicon electrical steel sheet plate of embodiment A6.
As shown in figure 3, the figure is using typical (200) the superstructure dark field image of transmission electron microscope observing embodiment A6 samples,
It is observed that the APB (in figure shown in black lines) of B2 ordered phases, B2 ordered phases average-size is about under the visual field
185nm, it meets requirement of the technical program for B2 ordered phase average-sizes.
It follows that technical scheme is processed by rational composition design+specific annealing process
Functional and high-frequency soft magnetic excellent performance high-silicon electrical steel and the steel plate as obtained in the Steel material.
It should be noted that listed above is only specific embodiment of the invention, it is clear that real the invention is not restricted to more than
Example is applied, there is the similar change of many therewith.If those skilled in the art directly derived from present disclosure or
The all deformations associated, all should belong to protection scope of the present invention.
Claims (7)
1. a kind of excellent high-silicon electrical steel of high-gradient magnetism, the microstructure of the excellent high-silicon electrical steel of the high-gradient magnetism contains
B2 ordered phases or B2 ordered phases+D03Ordered phase, it is characterised in that its chemical elements in percentage by mass is：
Si:5.5-7.0%；
Mn:0.015-0.10%；
At least one of B, Zn, Co, V, Sn, Cr, Sb, Nb, Ni, Cu, Bi, its total addition level are 0.0010-0.50%；
Balance of Fe and other inevitable impurity；
Wherein the average-size d of B2 ordered phases meets：55≤d≤exp(125×Si-0.87)+2×103×c-1.5, wherein d's
Unit is nm, and c represents the cooldown rate in 350-850 DEG C of temperature range, its unit for DEG C/s, the scope of c is 1-300 DEG C/s,
Si in formula represents the weight/mass percentage composition of Si elements；
Annealing temperature of the excellent high-silicon electrical steel of the high-gradient magnetism in annealing steps is 950-1200 DEG C, during annealing insulation
Between be 10-60s.
2. the excellent high-silicon electrical steel of high-gradient magnetism as claimed in claim 1, it is characterised in that Si contents are 6.2-7%.
3. the excellent high-silicon electrical steel of high-gradient magnetism as claimed in claim 1, it is characterised in that the inevitable impurity
In C≤0.0055%, S≤0.0045%, P≤0.010%, N≤0.008%, Al≤0.10%.
4. the excellent high-silicon electrical steel of high-gradient magnetism as claimed in claim 1, it is characterised in that the iron loss of the high-silicon electrical steel
P10/400≤ 6.5W/kg, B25≥1.41T。
5. the excellent high silicon electrical steel sheet of a kind of high-gradient magnetism, it is characterised in that it is used such as any one in claim 1-4
Described high-silicon electrical steel is obtained.
6. a kind of manufacture method for manufacturing the excellent high silicon electrical steel sheet of high-gradient magnetism as claimed in claim 5, its feature exists
In it is 5-200 DEG C/s to control the cooldown rate in 350-850 DEG C of temperature range.
7. manufacture method as claimed in claim 6, it is characterised in that the cooldown rate in 350-850 DEG C of temperature range of control
It is 8-90 DEG C/s.
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| CN1037231A (en) * | 1988-03-23 | 1989-11-15 | 日立金属株式会社 | Low-frequency transformer |
| CN1692164A (en) * | 2002-11-11 | 2005-11-02 | Posco公司 | Method for manufacturing high silicon grain-oriented electrical steel sheet with superior core loss property |
| CN104073749A (en) * | 2014-06-18 | 2014-10-01 | 安泰科技股份有限公司 | Iron-based amorphous magnetically soft alloy with uniform element distribution and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1037231A (en) * | 1988-03-23 | 1989-11-15 | 日立金属株式会社 | Low-frequency transformer |
| CN1692164A (en) * | 2002-11-11 | 2005-11-02 | Posco公司 | Method for manufacturing high silicon grain-oriented electrical steel sheet with superior core loss property |
| CN104073749A (en) * | 2014-06-18 | 2014-10-01 | 安泰科技股份有限公司 | Iron-based amorphous magnetically soft alloy with uniform element distribution and preparation method thereof |
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| Effect of quench cooling rate on residual stress, microstructure and mechanical property of an Fe–6.5Si alloy;Zhihao Zhang at al.;《Materials Science and Engineering A》;20111014;第520页左栏、第521页左栏、第522页右栏 * |
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