CN103540846B - A kind of Thin Specs, ultralow iron loss, lower noise high magnetic effect orientating-sensitive sheet and preparation method thereof - Google Patents
A kind of Thin Specs, ultralow iron loss, lower noise high magnetic effect orientating-sensitive sheet and preparation method thereof Download PDFInfo
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Abstract
The invention discloses the technology of preparing of a kind of Thin Specs, ultralow iron loss, lower noise, high magnetic effect orientating-sensitive sheet, it consists of 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, by the high magnetic effect orientating-sensitive sheet that the techniques such as hot rolling, cold rolling, annealing process are obtained, have ultralow iron loss, high magnetic flux density, low magnetostriction coefficient, thickness is thin waits excellent properties, and technique of the present invention is simple, tissue stabilization, while guarantee transformer capacity is constant, economizes on material greatly, saving resource, for manufacturing the optimal candidate material of high-grade power transmission and distribution transformer core 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 Specs, 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, and be China's rolling shapes seriously in short supply, its consumption is substantially proportional with generated energy always.The cold-rolled orientation electrical steel of silicone content ~ 3% is the important soft magnetic materials of a class, mainly in order to manufacture the iron core of transformer, has a wide range of applications in power telecommunication cause.And the loss of electrical steel makes that caused electric quantity loss accounts for the annual generated energy in various countries 2.5% ~ 4.5%, therefore various countries produce electrical steel always worry out reduce iron loss.The target proposing " energy-saving and emission-reduction " that China is clear and definite in Eleventh Five-Year Plan outline is also classified as an important task.As can be seen here, the Sustainable development of development on China and even international economy of high-quality silicon steel product innovation has important impact.
At present, orientation silicon steel production technology main in the world has four kinds, is heat CGO, heat Hi-B, low-temperature heat CGO, low-temperature heat Hi-B respectively.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, in the Japanese production capacity at high magnetic induction grain-oriented silicon steel, quality product, technique and variety development etc., be in rank first.Japan is a large amount of produces the thick oriented silicon steel of 0.23mm, and 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, the highest magnetic strength reaches more than 1.94T.
Domestic only have Wuhan Iron and Steel Plant, Baosteel can batch stably manufactured high magnetic induction grain-oriented silicon steel at present.Wuhan Iron and Steel Plant research conditions is as follows: a silicon steel Introduced from Japan Nippon Steel technology, heat twice cold-rolling practice is adopted to produce CGO product, heat once cold rolling method production Hi-B product, but Hi-B output is few, two silicon steel adopt low-temperature heat twice cold-rolling practice 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 stablize batch production 0.23mm thick low-temperature heat Hi-B oriented silicon steel, but there is no the thick high magnetic induction oriented silicon steel of transformer 0.18mm.
Based on above Study and appliance background, China needs research and development Thin Specs, ultra-low loss high magnetic induction grain-oriented silicon steel badly, to adapt to China's power industry development need, for development China 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 be applied to the core material-Thin Specs of power transmission and distribution transformer, high magnetic strength, ultralow iron loss oriented silicon steel material in exploitation power industry, while realizing reducing siliconized plate thickness, improve magnetic strength B8, reduce iron loss and noise level, develop and have higher than the Thin Specs 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 kind of cold-rolled orientation silicon steel 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.
Grain-oriented Si steel sheet 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.
Manufacture a manufacturing technology for grain-oriented Si steel sheet of the present invention, comprise 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 at 1150 ~ 1300 DEG C, first roughing 2 passage after insulation 2 ~ 3h, then finish rolling 3 passage, final draught is 80 ~ 90%, and sheet metal thickness≤3mm can form MnS inhibitor in the hot rolling;
Curling: to be heated to 500 ~ 600 DEG C;
Normalizing: anneal rapidly at 900 ~ 1100 DEG C, the time is 1 ~ 5min, controls the precipitation of particle, size, distribution, and then controls the homogeneity of tissue, and makes sheet material generation primary recrystallization;
Cold rolling: draught is 80 ~ 90%, thickness≤0.18mm;
Decarburization-nitriding: pass into water vapour during decarburization, controls final C content at 30 ~ 500ppm, passes into NH during nitriding
3, carry out at 800 DEG C, and coated glass film;
High temperature annealing, purification:
1) described high temperature annealing is under pure nitrogen gas protection, is raised to 400 ~ 500 DEG C of insulation 2 ~ 4h, removes water vapour and air-isolation;
2) at nitrogen: hydrogen is under the condition of 1:1 ~ 3, temperature rise rate is 31 DEG C/h ~ 43 DEG C/h under furnace temperature is risen to 1120 ~ 1200 DEG C after, environment is changed to pure hydrogen, insulation 8 ~ 10h;
3) purify particle, remove inhibitor and impurity.
Cooling, coating insulating coating, obtained.
The thickness of the grain-oriented Si steel sheet that the present invention obtains 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 each alloys producing adopted in the present invention and mechanism as follows:
When C:C content is excessive, steel strength hardness improves, processing and decarburization difficulty, time too low, then not easily undergo phase transition when Si content is higher, coarse grains during hot rolling, and due to <110> texture strong, cold rolling rear remaining tangible metacrystal grain, after high temperature annealing, secondary recrystallization is incomplete;
Si:Si element can play the effect that increase resistivity reduces core loss and reduces magnetostriction coefficient in oriented silicon steel, if when general Si content is lower, then 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, inhibitor can be formed on the other hand contribute to refinement magnetic domain and secondary recrystallization development in steel, main and the Mn of S in steel combines generation MnS, form the precipitate that dispersion is tiny, can significantly refinement magnetic domain, contribute to the development of Gauss's crystal grain; When Mn too high levels, austenitic transformation interval can be increased, promote austenite phase transformation, refinement primary recrystallization crystal grain, make secondary recrystallization unstable; Restraining effect is not had time too low;
Als:Al element is the one of the chief elements of inhibitor, can be combined hard particles such as forming AlN, form inhibitor with MnS in nitriding process with N element, improves rejection ability, easily produces thick phase time too high, and time 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 time too low, and too high meeting makes glass coating tack be deteriorated, and steel fragility increases;
Mo: can play pinning crystal boundary Grain refinement, and magnitude of magnetostriction under to a certain degree can improving silicon steel magnetic strength state of saturation, to a certain degree can reduce noise;
Cu: when Cu content is less, can form meticulous CuS with S, can suppress the hypertrophy of primary recrystallization crystal grain on the one hand, make homogeneous microstructure, also can promote growing up of Gauss's crystal grain in secondary recrystallization process, optimizes 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, makes nitriding to form inhibitor AlN in silicon steel, inhibitor Mass distribution time, can make cold rolling after there is suitable delicate tissues, contribute to guaranteeing primary recrystallization grain-size; Easy at casting billet surface generation air blister defect on the one hand time too high, primary recrystallization crystal grain can be made to become too tiny on the one hand, the growth of Gauss's crystal grain is affected, and proportional amount is wayward, and time too low, restraint is not enough;
P: can improve secondary recrystallization temperature, promotes Gauss's crystal grain agglomeration, and the quantity on the one hand by increasing Gauss's orientation crystal grain reduces iron loss, improves magnetic strength, also effectively can improve the resistivity of silicon steel, reduces iron loss; Make steel fragility significantly increase during content height, cold rollingly easily to ftracture, poor in processability;
The beginning temperature of secondary recrystallization can be reduced when S:S constituent content is too high, the magnetic property of steel is worsened; The quantity of orientation crystal grain can be made time lower to increase, reduce secondary recrystallization crystal particle dimension, improve silicon-steel magnetic energy, and MnS inhibitor can be formed with Mn, affect primary recrystallization grain-size to a certain extent;
There is provided in the present invention its process characteristic of manufacture method be: first carry out smelting and make alloying element C, Si, Mn, Al, Sn, Mo, Cu, N, P, S, the ingot casting that surplus is made up of iron and other inevitable impurity, hot-rolled temperature is 1150 ~ 1300 DEG C, is beneficial to the formation of MnS and CuS inhibitor.Carry out curling subsequently, the temperature of normalizing process controls at 900 ~ 1100 DEG C, and ensure that recrystallize is abundant, particle is separated out evenly.Time cold rolling, sheet metal thickness is controlled at below 0.18mm, decarburization, nitriding, guarantee that C content controls at 30ppm ~ 500ppm, promote the formation of AlN and SiN inhibitor, then coated glass film.Carry out high temperature annealing generation secondary recrystallization subsequently, first use pure nitrogen gas, the water vapour brought when 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 time controling is in 16 ~ 20h, to be conducive to fully secondary recrystallization occurring.Final temp rises to 1200 DEG C, removes inhibitor, cools subsequently and apply insulating coating, making finished product.Make whole technique simple, tissue stabilization; Obtained siliconized plate thickness 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; While guarantee transformer capacity is constant, greatly economize on material, saving resource, for manufacturing the optimal candidate material of high-grade power transmission and distribution transformer core at present.
[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 (wt%) of table 1 steel billet, 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 DEG C; insulation 2.5h; be hot-rolled down to 3mm; final draught be 85% carry out curling; then carry out normalizing process, at 900 ~ 1100 DEG C, be incubated 1 ~ 5min anneal, cold rolling in the final molding of cold-rolling mill enterprising andante material; draught is 90%, and gauge control is at 0.18mm.Carry out decarburization, nitriding subsequently, during decarburization, pass into water vapour, control final C content at 450ppm, during nitriding, pass into NH
3carry out at 800 DEG C and coated glass film, finally high temperature annealing at 1110 ~ 1120 DEG C, under pure nitrogen gas protection, be raised to 450 DEG C of insulation 3h, remove water vapour at nitrogen after air-isolation: hydrogen is under 1:2.5 condition, and temperature rise rate is after furnace temperature being risen to 1120 ~ 1200 DEG C under 40 DEG C/h, environment is changed to pure hydrogen, insulation 8.5h; Formed the oriented silicon steel sheet material of goss texture by secondary recrystallization, and remove inhibitor and impurity, slow cooling is lowered the temperature, and coating insulating coating, stress relief annealing, makes finished product.
As shown in table 2 by single sheet measurement equipment Inspection magnetic property result.
Table 2 Thin Specs, 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 (wt%) of table 3 steel billet, 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 DEG C; first roughing 2 passage after insulation 3h; finish rolling 3 passage again; final draught is 80%, is hot-rolled down to 3mm, carries out curling; then normalizing process is carried out; at 900 ~ 1000 DEG C, be incubated 1 ~ 5min anneal, cold rolling in the final molding of cold-rolling mill enterprising andante material, gauge control is at 0.18mm.Carry out the final C content of Decarburization Control subsequently and pass into NH when 300ppm, nitriding
3, carry out at 800 DEG C, and coated glass film; Last described high temperature annealing, under pure nitrogen gas protection, is raised to 500 DEG C of insulation 3.5h, removes water vapour and air-isolation; At nitrogen: hydrogen is under the condition of 1:1 ~ 3, temperature rise rate is that after furnace temperature being risen to 1120 ~ 1200 DEG C under 35 DEG C/h, environment is changed to pure hydrogen, insulation 9h; Formed the oriented silicon steel sheet material of goss texture by secondary recrystallization, and remove inhibitor and impurity, slow cooling is lowered the temperature, and coating insulating coating, stress relief annealing, makes finished product.
As shown in table 4 by single sheet measurement equipment Inspection magnetic property result.
Table 4 Thin Specs, 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 (wt%) of table 5 steel billet, 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 DEG C, insulation 2.3h, is hot-rolled down to 3mm, carries out curling, then carry out normalizing process, and at 950 ~ 1050 DEG C, be incubated 1 ~ 5min anneal, cold rolling in the final molding of cold-rolling mill enterprising andante material, gauge control is at 0.18mm.Pass into water vapour during decarburization subsequently, control final C content at 300ppm, during nitriding, pass into NH
3, carry out at 800 DEG C, and coated glass film, finally under pure nitrogen gas protection, be raised to 400 DEG C of insulation 2h, remove water vapour and air-isolation; At nitrogen: hydrogen is under 1:3 condition, temperature rise rate is under 40 DEG C/h, furnace temperature is risen to 1120 ~ 1150 DEG C of environment to be changed to pure hydrogen, lower insulation 8h; Formed the oriented silicon steel sheet material of goss texture by secondary recrystallization, and remove inhibitor and impurity, slow cooling is lowered the temperature, and coating insulating coating, stress relief annealing, makes finished product.
As shown in table 6 by single sheet measurement equipment Inspection magnetic property result.
Properties of sample prepared by table 6
| 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 (wt%) of table 7 steel billet, 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 DEG C, insulation 3h, first roughing 2 passage of hot rolling; finish rolling 3 passage is to 3mm again, carries out curling, then carries out normalizing process; at 1000 ~ 1100 DEG C, be incubated 1 ~ 5min anneal, cold rolling in the final molding of cold-rolling mill enterprising andante material, gauge control is at 0.18mm.Pass into water vapour when carrying out decarburization subsequently, control final C content at 250ppm, during nitriding, pass into NH
3, carry out at 800 DEG C, 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 DEG C of insulation 2 ~ 4h, remove water vapour and air-isolation; At nitrogen: hydrogen is under 1:3 condition, temperature rise rate is that after furnace temperature being risen to 1120 ~ 1200 DEG C under 40 DEG C/h, environment is changed to pure hydrogen, insulation 10h; Formed the oriented silicon steel sheet material of goss texture by secondary recrystallization, and remove inhibitor and impurity, slow cooling is lowered the temperature, and coating insulating coating, stress relief annealing, makes finished product.
As shown in table 8 by single sheet measurement equipment Inspection magnetic property result.
Table 8 Thin Specs, 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 (8)
1. a cold-rolled orientation silicon steel sheet, is characterized in that the moiety of described siliconized plate is:
The thickness of described cold-rolled orientation silicon steel sheet is 0.18mm, core loss P1.7≤0.80W/Kg, magnetostriction coefficient λ≤6 × 10
-6, magneticflux-density B
8>=1.88T.
2. a manufacture method for cold-rolled orientation silicon steel sheet as claimed in claim 1, 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, coating insulating coating, obtained;
Described high temperature annealing comprises the following steps:
1) under pure nitrogen gas protection, be raised to 400 ~ 500 DEG C of insulation 2 ~ 4h, remove water vapour and air-isolation;
2) at nitrogen: hydrogen is under the condition of 1:1 ~ 3, and after furnace temperature being risen to 1120 ~ 1200 DEG C, environment is changed to pure hydrogen, insulation 8 ~ 10h.
3. manufacture method as claimed in claim 2, it is characterized in that, temperature should control at 1150 ~ 1300 DEG C by described course of hot rolling, insulation 2 ~ 3h.
4. manufacture method as claimed in claim 2, it is characterized in that, the final draught of described hot rolling is 80 ~ 90%, sheet metal thickness≤3mm.
5. manufacture method as claimed in claim 2, is characterized in that, described normalizing temperature, at 900 ~ 1100 DEG C, is incubated 1 ~ 5min.
6. manufacture method as claimed in claim 2, it is characterized in that, described cold roling reduction is 80 ~ 90%, thickness≤0.18mm.
7. manufacture method as claimed in claim 2, it is characterized in that, in described decarburization-nitriding, final C content is 30 ~ 500ppm.
8. manufacture method as claimed in claim 2, is characterized in that, described high-temperature annealing step 2) in the temperature rise rate that adopts be 31 DEG C/h ~ 43 DEG C/h.
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| CN105405633B (en) * | 2014-09-15 | 2017-05-24 | 泰州市天力铁芯制造有限公司 | Manufacturing process of transformer iron core |
| CN104299745B (en) * | 2014-09-17 | 2017-01-11 | 明光市锐创电气有限公司 | Silicon steel sheet used for transformer |
| CN104372238B (en) * | 2014-09-28 | 2016-05-11 | 东北大学 | A kind of preparation method who is orientated high silicon steel |
| 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 |
| 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 |
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