CN103540846A - Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof - Google Patents
Thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet and production method thereof Download PDFInfo
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Abstract
The invention discloses a production technology of a thin-gauge, ultra-low iron loss, low-noise and high-magnetic induction oriented silicon steel sheet. The oriented silicon steel sheet comprises the following components in percentage by weight: 0.003-0.05 percent of C, 4.1-9 percent of Si, 0.05-0.5 percent of Mn, 0.02-0.06 percent of Al, 0.01-1 percent of Sn, 0.05-0.1 percent of Mo, 0.2-1 percent of Cu, 0.003-0.02 percent of N, 0.002-0.06 percent of P, 0.001-0.008 percent of S and the balance of iron and other inevitable impurities. The high-magnetic induction oriented silicon steel sheet which is produced through hot rolling, cold rolling and annealing processes and the like has the superior performances such as ultra-low iron loss, high flux density, low magnetostriction coefficient and small thickness, has the advantages of simple process, stable texture and capabilities of greatly saving the materials and saving the resources while guaranteeing that the capacity of a transformer is unchanged, and is the best candidate material for manufacturing high-grade power transmission and distribution transformer cores at present.
Description
[technical field]
The invention belongs to power industry power transmission and distribution transformer core Material Field, specifically relate to a kind of thin specification, ultralow iron loss, lower noise high magnetic effect orientating-sensitive sheet and preparation method thereof.
[background technology]
Cold rolling Electrical Steel Sheet is mainly used in electrician trade, is the serious rolling shapes in short supply of China always, and its consumption is substantially proportional with generated energy.The cold-rolled orientation electrical steel of silicone content～3% is the important soft magnetic materials of a class, main in order to manufacture the iron core of transformer, in power telecommunication cause, has a wide range of applications.And the loss of electrical steel is made caused electric quantity loss and is accounted for 2.5%～4.5% of the annual generated energy in various countries, thus various countries produce electrical steel always worry out reduce iron loss.China in Eleventh Five-Year Plan outline clear and definite proposition " energy-saving and emission-reduction " target and classified as an important task.As can be seen here, the development of high-quality silicon steel product innovation has important impact to the Sustainable development of China and even international economy.
At present, main orientation silicon steel production technology has four kinds in the world, is respectively heat CGO, heat Hi-B, low-temperature heat CGO, low-temperature heat Hi-B.Wherein, low-temperature heat Hi-B oriented silicon steel manufacturing technology is state-of-the-art technology, and its core technology is nitriding, and because cost is minimum, performance is good, and the competitiveness of product in market is the strongest.
Since eighties of last century, Japan is at the aspects such as production capacity, quality product, technique and variety development of high magnetic induction grain-oriented silicon steel, in rank first.The a large amount of thick oriented silicon steels of 0.23mm of producing of Japan, adopt the modern techniquies such as laser scored, rapid heating to carry out refinement magnetic domain, make the minimum iron loss P17/50 of Hi-B product made from steel drop to 0.6W/kg, more than the highest magnetic strength reaches 1.94T.
Domestic only have Wuhan Iron and Steel Plant, Baosteel stably manufactured high magnetic induction grain-oriented silicon steel in batches at present.Wuhan Iron and Steel Plant research situation is as follows: a silicon steel Introduced from Japan Nippon Steel technology, adopt twice cold-rolling practice of heat to produce CGO product, heat once cold rolling method production Hi-B product, but Hi-B output is few, two silicon steel adopt twice cold-rolling practice of low-temperature heat to produce CGO product, and three silicon steel mainly adopt heat once cold rolling method to produce Hi-B product.At present, Wuhan Iron and Steel Plant can adopt the thick high magnetic induction grain-oriented silicon steel of low-temperature heat once cold rolling method stable batch production 0.27mm.Baosteel can be stablized the thick low-temperature heat Hi-B of batch production 0.23mm oriented silicon steel, but there is no the thick high magnetic induction oriented silicon steel of 0.18mm for transformer.
Based on above research and application background, China needs the thin specification of research and development, ultra-low loss high magnetic induction grain-oriented silicon steel badly, to adapt to China's power industry development need, for revitalizing China's steel industry, equipment manufacture, realize Chinese national economy Sustainable development, set up friendly environment society and be significant.
[summary of the invention]
The object of the invention is to develop the core material-thin specification that is applied to power transmission and distribution transformer in power industry, high magnetic strength, ultralow iron loss oriented silicon steel material, realize when reducing siliconized plate thickness, improve magnetic strength B8, reduce iron loss and noise level, develop and have higher than the thin specification of the GB highest ranking trade mark, ultralow iron loss, high magnetic induction grain-oriented silicon steel material.
The present invention adopts technical scheme for achieving the above object:
A sheet, the thickness of siliconized plate is 0.18mm, core loss P1.7≤0.80W/Kg, magnetostriction coefficient λ≤6 * 10
-6, magneticflux-density B8>=1.88T.
Oriented silicon steel disc provided by the invention, moiety is:
C：0.003～0.05wt% Si：4.1～9wt% Mn：0.05～0.5wt%
Al：0.02～0.06wt% Sn：0.01～1wt% Mo：0.05～0.1wt%
Cu：0.2～1wt% N：0.003～0.02wt% P：0.002～0.06wt%
S:0.001～0.008wt%, surplus is by iron and other inevitable impurity.
A manufacturing technology of manufacturing oriented silicon steel disc of the present invention, comprises the steps:
Preparation is by C, Si, Mn, Al, Sn, Mo, Cu, N, P, S, and surplus forms silicon steel ingot by iron and other inevitable impurity;
Through hot rolling: temperature is controlled to 1150～1300 ℃, is incubated first roughing 2 passages after 2～3h, then finish rolling 3 passages, final draught is 80～90%, sheet metal thickness≤3mm can form MnS inhibitor in course of hot rolling;
Curling: to be heated to 500～600 ℃;
Normalizing: annealing rapidly at 900～1100 ℃, the time is 1～5min, controls separating out of particle, size, distribution, and then the homogeneity of control tissue, and make sheet material generation primary recrystallization;
Cold rolling: draught is 80～90%, thickness≤0.18mm;
Decarburization-nitriding: pass into water vapour during decarburization, control final C content at 30～500ppm, pass into NH during nitriding
3, at 800 ℃, carry out, and coated glass film;
High temperature annealing, purification:
1) described high temperature annealing, under pure nitrogen gas protection, is raised to 400～500 ℃ of insulation 2～4h, removes water vapour air-isolation;
2) at nitrogen: hydrogen is under the condition of 1:1～3, temperature rise rate is under 31 ℃/h～43 ℃/h, furnace temperature to be risen to after 1120～1200 ℃, and environment is changed to pure hydrogen, is incubated 8～10h;
3) purify particle, remove inhibitor and impurity.
Cooling, coating insulating coating, make.
The thickness of the oriented silicon steel disc that the present invention makes is 0.18mm, core loss P1.7≤0.80W/Kg, magnetostriction coefficient λ≤6 * 10-6, magneticflux-density B8 >=1.88T, other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires.
The function and mechanism of each alloying element adopting in the present invention is as follows:
When C:C content is excessive, steel strength hardness improves, processing and decarburization difficulty, when too low, when Si content is higher, be difficult for undergoing phase transition, coarse grains during hot rolling, and because <110> texture is strong, cold rolling rear remaining tangible metacrystal grain, after high temperature annealing, secondary recrystallization is incomplete;
Si:Si element can play the effect that increases resistivity decreased core loss and reduce magnetostriction coefficient in oriented silicon steel, if when general Si content is lower, resistivity of material rising is less even reduces, and core loss is increased; But when Si content is higher, the fragility of steel will increase significantly, cold rolling processing difficulties;
Mn:Mn element can improve the resistivity of material on the one hand, reduce iron loss, in steel, can form on the other hand inhibitor and contribute to refinement magnetic domain and secondary recrystallization development, main and the Mn of S in steel is in conjunction with generation MnS, form and disperse tiny precipitate, can significantly refinement magnetic domain, contribute to the development of Gauss's crystal grain; When Mn too high levels, can increase austenitic transformation interval, promote austenite phase transformation, refinement primary recrystallization crystal grain, makes secondary recrystallization unstable; When too low, do not have restraining effect;
Als:Al element is the one of the chief elements of inhibitor, can in nitriding process, be combined hard particles such as forming AlN with N element, forms inhibitor with MnS, improves inhibition ability, easily produces thick phase when too high, and when too low, inhibition is not enough;
Sn: Grain Boundary Segregation element, suitable Sn element can play the effect of anchoring secondary recrystallization crystal grain, plays stabilizing tissue, improves the effect of texture, DeGrain when too low, too high meeting makes glass coating tack variation, and steel fragility increases;
Mo: can play pinning crystal boundary Grain refinement, and can to a certain degree improve magnitude of magnetostriction under silicon steel magnetic strength state of saturation, can to a certain degree reduce noise;
Cu: when Cu content is less, can form meticulous CuS with S, can suppress on the one hand the hypertrophy of primary recrystallization crystal grain, make homogeneous microstructure, also can promote growing up of Gauss's crystal grain in secondary recrystallization process, optimize the magnetic property of the finished product; In addition, Cu effectively improves the resistivity of silicon steel, reduces iron loss, improves magnetic;
N: after decarburization, nitriding is made to form in silicon steel inhibitor AlN, when inhibitor Mass distributes, can make after cold rolling to there is suitable delicate tissues, contribute to guarantee primary recrystallization grain-size; When too high, easily at casting billet surface, produce air blister defect on the one hand, can make primary recrystallization crystal grain become too tiny on the one hand, the growth of Gauss's crystal grain is affected, ratio content is wayward, and when too low, restraint is not enough;
P: can improve secondary recrystallization temperature, promote Gauss's crystal grain agglomeration, the quantity that can be orientated by increasing Gauss on the one hand crystal grain reduces iron loss, improves magnetic strength, also can effectively improve the resistivity of silicon steel, reduces iron loss; When content is high, make steel fragility significantly increase, cold rolling easy cracking, poor in processability;
When S:S constituent content is too high, can reduce the beginning temperature of secondary recrystallization, the magnetic property of steel is worsened; When lower, can make the quantity that is orientated crystal grain increase, reduce secondary recrystallization crystal particle dimension, improve silicon steel magnetic property, and can form MnS inhibitor with Mn, affect to a certain extent primary recrystallization grain-size;
In the present invention, provide its process characteristic of manufacture method be: first smelt and make alloying element C, Si, Mn, Al, Sn, Mo, Cu, N, P, S, the ingot casting that surplus is comprised of iron and other inevitable impurity, hot-rolled temperature is 1150～1300 ℃, is beneficial to the formation of MnS and CuS inhibitor.Carry out subsequently curlingly, the temperature of normalizing process is controlled at 900～1100 ℃, guarantees that recrystallize is abundant, and particle is separated out evenly.When cold rolling, sheet metal thickness is controlled at below 0.18mm, decarburization, nitriding, guarantee that C content is controlled at 30ppm～500ppm, promotes the formation of AlN and SiN inhibitor, then coated glass film.Carry out subsequently high temperature annealing generation secondary recrystallization, first use pure nitrogen gas, the water vapour bringing while removing coated glass film, and isolate oxygen, choose the N of suitable proportion
2: H
2, because under nitrogen partial pressure effect, can guarantee that inhibitor AlN does not decompose, and the time be controlled in 16～20h, to be conducive to fully occur secondary recrystallization.Final temp rises to 1200 ℃, removes inhibitor, cooling and apply insulating coating subsequently, makes finished product.Make whole technique simple, tissue is stable; The siliconized plate thickness making is 0.18mm, core loss P1.7≤0.80W/Kg, magnetostriction coefficient λ≤6 * 10
-6, magneticflux-density B8>=1.88T, other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires; When guaranteeing that transformer capacity is constant, greatly economize on material, saving resource, for manufacturing at present the optimal candidate material of high-grade power transmission and distribution transformer core.
[accompanying drawing explanation]
Fig. 1 is manufacture method schema of the present invention
[embodiment]
Embodiment 1
In the vacuum melting furnace of 500Kg, carry out the smelting of silicon steel strand, casting composition is as shown in table 1.
The chemical composition of table 1 steel billet (wt%), surplus is Fe
| C | Si | Mn | Al | Sn | Mo | Cu | N | P | S |
| 0.004 | 4.3 | 0.08 | 0.03 | 0.08 | 0.05 | 0.3 | 0.005 | 0.008 | 0.005 |
Strand is heated to 1150～1170 ℃; insulation 2.5h; be hot-rolled down to 3mm; final draught be 85% carry out curling; then carry out normalizing processing, at 900～1100 ℃, be incubated 1～5min and anneal, cold rolling in the final molding of the enterprising andante material of cold-rolling mill; draught is 90%, and gauge control is at 0.18mm.Carry out subsequently decarburization, nitriding, during decarburization, pass into water vapour, control final C content at 450ppm, during nitriding, pass into NH
3at 800 ℃, carry out and coated glass film, last high temperature annealing at 1110～1120 ℃, under pure nitrogen gas protection, be raised to 450 ℃ of insulation 3h, remove after water vapour air-isolation at nitrogen: hydrogen is under 1:2.5 condition, and temperature rise rate is furnace temperature to be risen to after 1120～1200 ℃ under 40 ℃/h, environment is changed to pure hydrogen, insulation 8.5h; By secondary recrystallization, form the oriented silicon steel sheet material of goss texture, and remove inhibitor and impurity, slow cooling cooling, applies insulating coating, and stress relief annealing, makes finished product.
As shown in table 2 by single sheet measurement equipment Inspection magnetic property result.
The thin specification of table 2, ultralow iron loss and high magnetic induction oriented silicon steel monolithic finished product magnetic property
| Test piece number (Test pc No.) | Hot-rolled temperature | Normalizing temperature/time | High temperature anneal temperature | P1.7（W/Kg） | B8(T) | Magnetostriction coefficient λ |
| A-1 | 1150 | 900，2.5min | 1110 | 0.800 | 1.884 | 5×10 -6 |
| A-2 | 1150 | 1000，3min | 1120 | 0.791 | 1.887 | 6×10 -6 |
| A-3 | 1170 | 900，2min | 1130 | 0.789 | 1.889 | 6×10 -6 |
| A-4 | 1170 | 1100，2min | 1120 | 0.794 | 1.901 | 5×10 -6 |
Other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires.
Embodiment 2
In the vacuum melting furnace of 500Kg, carry out the smelting of silicon steel strand, casting composition is as shown in table 3.
The chemical composition of table 3 steel billet (wt%), surplus is Fe
| C | Si | Mn | Al | Sn | Mo | Cu | N | P | S |
| 0.005 | 5.5 | 0.12 | 0.02 | 0.1 | 0.06 | 0.4 | 0.01 | 0.02 | 0.003 |
Strand is heated to 1160～1180 ℃; first roughing 2 passages after insulation 3h; finish rolling 3 passages again; final draught is 80%, is hot-rolled down to 3mm, carries out curling; then carry out normalizing processing; at 900～1000 ℃, be incubated 1～5min and anneal, cold rolling in the final molding of the enterprising andante material of cold-rolling mill, gauge control is at 0.18mm.Carry out subsequently the final C content of Decarburization Control and when 300ppm, nitriding, pass into NH
3, at 800 ℃, carry out, and coated glass film; Last described high temperature annealing, under pure nitrogen gas protection, is raised to 500 ℃ of insulation 3.5h, removes water vapour air-isolation; At nitrogen: hydrogen is under the condition of 1:1～3, and temperature rise rate is under 35 ℃/h, furnace temperature to be risen to after 1120～1200 ℃, and environment is changed to pure hydrogen, insulation 9h; By secondary recrystallization, form the oriented silicon steel sheet material of goss texture, and remove inhibitor and impurity, slow cooling cooling, applies insulating coating, and stress relief annealing, makes finished product.
As shown in table 4 by single sheet measurement equipment Inspection magnetic property result.
The thin specification of table 4, ultralow iron loss and high magnetic induction oriented silicon steel monolithic finished product magnetic property
| Test piece number (Test pc No.) | Hot-rolled temperature | Normalizing temperature/time | High temperature anneal temperature | P1.7（W/Kg） | B8(T) | Magnetostriction coefficient λ |
| B-1 | 1160 | 900，3min | 1150 | 0.788 | 1.904 | 6×10 -6 |
| B-2 | 1160 | 1000，2min | 1170 | 0.793 | 1.892 | 4×10 -6 |
| B-3 | 1180 | 900，2.5min | 1120 | 0.792 | 1.905 | 5×10 -6 |
| B-4 | 1180 | 1000，4min | 1190 | 0.783 | 1.901 | 5×10 -6 |
Other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires.
Embodiment 3
In the vacuum melting furnace of 500Kg, carry out the smelting of silicon steel strand, casting composition is as shown in table 5.
The chemical composition of table 5 steel billet (wt%), surplus is Fe
| C | Si | Mn | Al | Sn | Mo | Cu | N | P | S |
| 0.008 | 6.5 | 0.32 | 0.04 | 0.5 | 0.05 | 0.7 | 0.015 | 0.03 | 0.007 |
Strand is heated to 1200～1240 ℃, and insulation 2.3h, is hot-rolled down to 3mm, carries out curlingly, then carries out normalizing processing, is incubated 1～5min and anneals at 950～1050 ℃, and cold rolling in the final molding of the enterprising andante material of cold-rolling mill, gauge control is at 0.18mm.During decarburization subsequently, pass into water vapour, control final C content at 300ppm, during nitriding, pass into NH
3, at 800 ℃, carry out, and coated glass film, finally, under pure nitrogen gas protection, be raised to 400 ℃ of insulation 2h, remove water vapour air-isolation; At nitrogen: hydrogen is under 1:3 condition, and temperature rise rate is under 40 ℃/h, furnace temperature to be risen to 1120～1150 ℃ of environment to be changed to pure hydrogen, lower insulation 8h; By secondary recrystallization, form the oriented silicon steel sheet material of goss texture, and remove inhibitor and impurity, slow cooling cooling, applies insulating coating, and stress relief annealing, makes finished product.
As shown in table 6 by single sheet measurement equipment Inspection magnetic property result.
Table 6 preparation properties of sample
| Test piece number (Test pc No.) | Hot-rolled temperature | Normalizing temperature/time | High temperature anneal temperature | P17（W/Kg） | B8(T) | Magnetostriction coefficient λ |
| C-1 | 1200 | 950，3min | 1120 | 0.783 | 1.914 | 4×10 -6 |
| C-2 | 1200 | 1050，2.5min | 1150 | 0.782 | 1.912 | 5×10 -6 |
| C-3 | 1240 | 950，3min | 1120 | 0.781 | 1.902 | 4×10 -6 |
| C-4 | 1240 | 1050，4min | 1150 | 0.791 | 1.911 | 4×10 -6 |
Other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires.
Embodiment 4
In the vacuum melting furnace of 500Kg, carry out the smelting of silicon steel strand, casting composition is as shown in table 7.
The chemical composition of table 7 steel billet (wt%), surplus is Fe
| C | Si | Mn | Al | Sn | Mo | Cu | N | P | S |
| 0.05 | 8.5 | 0.45 | 0.06 | 0.8 | 0.07 | 0.9 | 0.018 | 0.05 | 0.002 |
Strand is heated to 1250～1300 ℃, insulation 3h, first roughing 2 passages of hot rolling; finish rolling 3 passages are to 3mm again, carry out curlingly, then carry out normalizing processing; at 1000～1100 ℃, be incubated 1～5min and anneal, cold rolling in the final molding of the enterprising andante material of cold-rolling mill, gauge control is at 0.18mm.While carrying out decarburization subsequently, pass into water vapour, control final C content at 250ppm, during nitriding, pass into NH
3, at 800 ℃, carry out, and the decarburization of coated glass film, nitriding, and coated glass film, finally at high temperature annealing under pure nitrogen gas protection, be raised to 400～500 ℃ of insulation 2～4h, remove water vapour air-isolation; At nitrogen: hydrogen is under 1:3 condition, and temperature rise rate is under 40 ℃/h, furnace temperature to be risen to after 1120～1200 ℃, and environment is changed to pure hydrogen, insulation 10h; By secondary recrystallization, form the oriented silicon steel sheet material of goss texture, and remove inhibitor and impurity, slow cooling cooling, applies insulating coating, and stress relief annealing, makes finished product.
As shown in table 8 by single sheet measurement equipment Inspection magnetic property result.
The thin specification of table 8, ultralow iron loss and high magnetic induction oriented silicon steel monolithic finished product magnetic property
| Test piece number (Test pc No.) | Hot-rolled temperature | Normalizing temperature/time | High temperature anneal temperature | P1.7（W/Kg） | B8(T) | Magnetostriction coefficient λ |
| D-1 | 1250 | 1000，4min | 1120 | 0.785 | 1.911 | 6×10 -6 |
| D-2 | 1250 | 1100，3min | 1150 | 0.787 | 1.913 | 5×10 -6 |
| D-3 | 1300 | 1000，2min | 1120 | 0.792 | 1.912 | 4×10 -6 |
| D-4 | 1300 | 1100，2.5min | 1150 | 0.793 | 1.904 | 4×10 -6 |
Other performances meet the material that can be used for manufacturing power transmission and distribution transformer core that GB2521 requires.
Claims (10)
1. a cold-rolled orientation silicon steel sheet, the thickness that it is characterized in that described siliconized plate is 0.18mm, core loss P1.7≤0.80W/Kg, magnetostriction coefficient λ≤6 * 10
-6, magneticflux-density B8>=1.88T.
2. oriented silicon steel as claimed in claim 1, is characterized in that the moiety of described siliconized plate is:
C：0.003～0.05wt% Si：4.1～9wt% Mn：0.05～0.5wt%
Al：0.02～0.06wt% Sn：0.01～1wt% Mo：0.05～0.1wt%
Cu：0.2～1wt% N：0.003～0.02wt% P：0.002～0.06wt%
S:0.001～0.008wt%, surplus is by iron and other inevitable impurity.
3. a manufacturing technology for oriented silicon steel disc as claimed in claim 2, the method comprises the steps:
Preparation is by C, Si, Mn, Al, Sn, Mo, Cu, N, P, S, and surplus forms silicon steel ingot by iron and other inevitable impurity;
Through hot rolling, curling, normalizing, cold rolling, decarburization-nitriding, high temperature annealing, purification, cooling, apply insulating coating, make.
4. manufacturing technology as claimed in claim 3, is characterized in that, described course of hot rolling should be controlled at temperature 1150～1300 ℃, is incubated 2～3h.
5. manufacturing technology as claimed in claim 3, is characterized in that, the final draught of described hot rolling is 80～90%, sheet metal thickness≤3mm.
6. manufacturing technology as claimed in claim 3, is characterized in that, described normalizing temperature, at 900～1100 ℃, is incubated 1～5min.
7. manufacturing technology as claimed in claim 3, is characterized in that, described cold roling reduction is 80～90%, thickness≤0.18mm.
8. manufacturing technology as claimed in claim 3, is characterized in that, in described decarburization-nitriding, final C content is 30～500ppm.
9. manufacturing technology as claimed in claim 3, is characterized in that,
1) described high temperature annealing, under pure nitrogen gas protection, is raised to 400～500 ℃ of insulation 2～4h, removes water vapour air-isolation;
2) at nitrogen: hydrogen is under the condition of 1:1～3, and furnace temperature is risen to after 1120～1200 ℃, and environment is changed to pure hydrogen, is incubated 8～10h.
10. manufacturing technology as claimed in claim 3, is characterized in that, described high-temperature annealing step 2) in the temperature rise rate that adopts be 31 ℃/h～43 ℃/h.
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| CN104299745A (en) * | 2014-09-17 | 2015-01-21 | 明光市锐创电气有限公司 | Silicon steel sheet used for transformer |
| CN105405633A (en) * | 2014-09-15 | 2016-03-16 | 泰州市天力铁芯制造有限公司 | Manufacturing process of transformer iron core |
| CN106435134A (en) * | 2016-11-02 | 2017-02-22 | 浙江华赢特钢科技有限公司 | Production technique of silicon steel sheet |
| EP3118336A4 (en) * | 2014-09-28 | 2017-07-12 | Northeastern University | Preparation method for oriented high-silicon steel |
| CN107630133A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | Production method of high-grade electrical steel product with excellent frequency conversion characteristic |
| CN111020131A (en) * | 2019-12-24 | 2020-04-17 | 东莞市大忠电子有限公司 | Annealing process of silicon steel iron core |
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| CN104217844A (en) * | 2014-09-03 | 2014-12-17 | 南阳市力矩软磁材料科技有限公司 | Silicon steel sheet with low iron loss, low noise, high magnetic flux and high laminating speed and preparation method thereof |
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| CN104299745A (en) * | 2014-09-17 | 2015-01-21 | 明光市锐创电气有限公司 | Silicon steel sheet used for transformer |
| EP3118336A4 (en) * | 2014-09-28 | 2017-07-12 | Northeastern University | Preparation method for oriented high-silicon steel |
| CN107630133A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | Production method of high-grade electrical steel product with excellent frequency conversion characteristic |
| CN107630133B (en) * | 2016-07-18 | 2019-06-28 | 鞍钢股份有限公司 | Production method of high-grade electrical steel product with excellent frequency conversion characteristic |
| CN106435134A (en) * | 2016-11-02 | 2017-02-22 | 浙江华赢特钢科技有限公司 | Production technique of silicon steel sheet |
| CN106435134B (en) * | 2016-11-02 | 2018-07-06 | 浙江华赢特钢科技有限公司 | A kind of production technology of silicon steel sheet |
| CN111020131A (en) * | 2019-12-24 | 2020-04-17 | 东莞市大忠电子有限公司 | Annealing process of silicon steel iron core |
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