CN103509906B - The smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic - Google Patents
The smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic Download PDFInfo
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- CN103509906B CN103509906B CN201210219963.1A CN201210219963A CN103509906B CN 103509906 B CN103509906 B CN 103509906B CN 201210219963 A CN201210219963 A CN 201210219963A CN 103509906 B CN103509906 B CN 103509906B
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Abstract
The invention discloses the smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic, it comprises the following steps: hot metal pretreatment → loading smelting → converter tapping → modifying process → dark carbonization treatment → deoxidation alloying process → Calcium treatment → refining is degassed → pour into base → hot rolling → pickling → cold rolling → annealing → coating, wherein modifying process controls the chemical composition of tapping top slag, and adds Calcium treatment operation in process.Adopt this smelting process can when without normalizing or bell furnace process annealing; by adding Calcium treatment agent and carry out Calcium treatment to molten steel and controlling its chemical composition, add the parameters such as quantity, mode, granularity; decrease operation on the one hand; avoid and occur secondary oxidation phenomenon because the Calcium treatment time is longer in RH refining process; the higher molten steel of purity can be obtained on the other hand; improve the magnetic strength of finished steel plate; improve the quality of finished steel plate; there is control convenient and simple for operation, the feature of cost reduction and administration measure.
Description
Technical field
The present invention relates to the smelting process of non-oriented electromagnetic steel sheet, particularly relate to the smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic.
Background technology
In recent years; along with all kinds of EI iron core, motor, compressor gradually to small-sized, accurate, efficient future development to reach energy-conservation, efficient; the demand of protection of the environment; in order to meet the needs of these electricity consumption products as its corresponding raw-material non-oriented electromagnetic steel sheet; excellent magnetic must be had again, the namely usually said performance possessing ultralow iron loss, superelevation magnetic strength while guaranteed price advantage.
Because Si, Al element can significantly improve the resistivity of material, effectively can reduce magnetocrystalline anisotropy, magnetization is made to become easier, thus significantly can reduce the iron loss of finished steel plate, therefore Xiang Gangzhong adds appropriate Si, Al element is improve non-oriented electromagnetic steel sheet magnetic one of effective means the most.But along with improving constantly of Si, Al element, the formation of a large amount of inclusion can be caused, so not only significantly inhibiting grain growth, impel lattice distortion, but also can domain motion be hindered, finally cause the magnetic hysteresis loss of steel to raise, magnetic induction performance reduction.Therefore, need to adopt the mode of normalizing or bell furnace process annealing effectively improve or improve the magnetic strength of finished steel plate.But this mode can cause production cost to rise, reduce product competitiveness in the market.
Because it is fast that Al element has deoxidation speed, the advantages such as deoxidation effect is good, and deoxidation expense is low, so Al is widely used in suitability for industrialized production as the reductor that cost performance is excellent.Shortcoming is: as the deoxidation products Al of inclusion
2o
3size is little, and quantity is many, is not easy to float to remove in follow-up refining, casting cycle, and when especially high containing Si, Al content, molten steel becomes comparatively thickness, and inclusion is also just difficult to remove more.In addition, in casting cycle, with the continuous reduction of molten steel temperature, grain boundaries particle solid solubility continuous decrease, also can separate out main component is further Al
2o
3secondary deoxidation products, because its size is less, and Dispersed precipitate, impact is further produced on the magnetic of finished product.
In order to do not adopt normalizing or bell furnace process annealing and do not change relatively-stationary chemical composition prerequisite under; the magnetic of effective removal or the inclusion improved in steel and raising finished steel plate, prior art is in molten steel, adopt calcium treating method to improve purity of steel.Because the oxygen in calcium constituent and molten steel, element sulphur have very strong avidity, to the removal of steel inclusion and sex change very effective, and can improve finished steel plate grain fineness number, control the form of inclusion and improve the toughness of finished steel plate; In addition, calcium constituent is insoluble to molten steel, and fusing point is low, boiling point is low, easily forms calcium steam, exists in the form of bubbles, form the inclusiones such as oarse-grained complex sulfide, calcium-aluminate with the oxygen in molten steel, sulphur effect in molten steel inside, easily floats, removes.
Publication number is that the Japanese Patent of JP 2009-57612 relates to and a kind ofly carries out Calcium treatment effectively to control the method for cluster inclusion form in molten steel to molten steel, it is mainly through selecting after RH refining (vacuum circulation degassing refining) terminates, the mode adding calcium or line feeding in ladle makes the impurity element in calcium constituent and molten steel combine, thus goes out the inclusion in molten steel.Because wire-feeding technique is relatively ripe, control simple to operate, by the wire-feeding velocity of control CaSi, is controlling the generation that can also suppress the inclusiones such as MnS, AlN in molten steel while Ca element recovery rate.This patent adopts line feeding mode at ambient pressure, RH refining (vacuum circulation degassing refining) time not only can be caused to increase and temperature loss, also cause molten steel secondary pollution feeding in silk process the situations such as suction nitrogen, secondary oxidation, slag occur, being unfavorable for the raising of Molten Steel Cleanliness.
Publication number is the Japanese patent application of JP 58-95811, discloses a kind of passing through in molten steel, adds the CaO powder being equivalent to 400 [S%] ~ 2000 [S%] kg reduces production cost with alternative calcium alloy method through abundant stirring.CaO powder can add or inject directly in ladle by vacuum mode.The refining treatment time of this patent needs to extend, and a large amount of CaO powder added can corrode resistance to material, cause Molten Steel Cleanliness to decline; Also can cause smelting process temperature loss, inclusion not easily floats.
Summary of the invention
The invention provides a kind of without normalizing or bell furnace process annealing, and can avoid producing in technological process inhaling nitrogen, the smelting process of the non-oriented electromagnetic steel sheet of secondary oxidation and slag phenomenon, it is by carrying out Calcium treatment to molten steel, and when RH refining, control the interpolation quantity of the Calcium treatment agent containing calcium constituent or calcium alloy, mode, the technical parameters such as granularity, reducing the molten steel obtaining high purity in production process situation, obtain the non-oriented electromagnetic steel sheet possessing excellent magnetic, have easy to operate, simple control, the feature of cost reduction and administration measure.
For achieving the above object, technical scheme of the present invention is optimized, and concrete steps are as follows:
1) raw material is through hot metal pretreatment, slagging-off.
2) collocation steel scrap, converter smelting.
3), after smelting, in molten steel, each multi-element chemical composition percent mass proportioning is: C≤0.05%, Si:0.2 ~ 1.6%, Mn:0.2 ~ 1.0%, P≤0.2%, S≤0.005%, Al:0.2 ~ 0.6%, N≤0.005%, O≤0.005%, surplus is Fe and inevitable inclusion.
4) converter tapping, carries out modifying process to ladle top slag, is controlled by the mass fraction of the ladle top slag chemical composition after process to be: CaO:15 ~ 35 part, SiO
2: 7 ~ 25 parts, Al
2o
3: 20 ~ 45 parts, T.Fe+MnO≤5 part, and CaO/SiO
2: 1 ~ 2.
5) refining of RH vacuum circulation degassing is carried out, and in this process:
A) dark decarburization is carried out, by carbon content control≤0.005% of molten steel;
B) deoxidation alloying process;
C) Calcium treatment is carried out, the Calcium treatment agent containing calcium constituent or calcium alloy is added in molten steel, its chemical composition percent mass proportioning is: Ca:5 ~ 45%, Si:10 ~ 35%, Mg:1 ~ 10%, Al:1 ~ 10%, P≤0.1%, S :≤0.1%, surplus is Fe and inevitable all the other elements, and its addition controls be greater than 0 kilogram/steel per ton and be less than 2.0 kilograms/steel per ton;
D) refining is degassed.
6) base is poured into.
7) hot rolling.
8) pickling.
9) cold rolling.
10) anneal.
11) coating.
The present invention adopts the Ultra-low carbon aluminium-silicon killed steel of the dark desulfurization of refining RH, raw material after hot metal pretreatment sulphur, slagging-off and the steel scrap of suitable proportion carry out collocation shove charge.In smelting process, guaranteeing slag is all right, and molten steel decarburization, temperature rise effect are stablized.
In order to ensure calcium treatment effect, need in converter tapping process, modifying process is carried out to ladle top slag.Need the oxidisability of the basicity of strict control slag, alumina content, slag, therefore by the control of the mass fraction of ladle top slag chemical composition be: CaO:15 ~ 35 part, SiO
2: 7 ~ 25 parts, Al
2o
3: 20 ~ 45 parts, T.Fe+MnO≤5 part, and CaO/SiO
2: 1 ~ 2.CaO/SiO
2ratio, referred to as " basicity ".Basicity is less than 1, and basicity is too low, slag slant acidity, is unfavorable for removing P, S element, and each type impurity in steel, and slag steel level of response can be caused to aggravate, and alloy consumption increases; Basicity is greater than 2, and basicity is too high, and slag alkalescence is strong, the poor fluidity of slag, is unfavorable for removing Ti element, and absorbs Al
2o
3inclusion, also can reduce Al simultaneously
2o
3activity.To the design of each composition, mainly consider that slag absorbs the ability of each type impurity, 1) T.Fe+MnO≤5 part are oxidisability in order to reduce slag, there is oxidative phenomena after avoiding deoxidation of molten steel alloying, produce SiO
2, Al
2o
3oxide inclusion.2) if CaO content is too low, SiO
2content is too high, and the basicity of slag will be very low, and CaO content is too high, SiO
2content is too low, then the basicity of slag will be very high.Both situations are all unfavorable for that ladle top slag absorbs the inclusion in steel like this.3) because steel liquid deoxidation alloying process can produce a large amount of Al
2o
3, Al
2o
3the reason of content range design is: Al
2o
3content is higher, and slag mobility can be deteriorated, and is unfavorable for absorb inclusion thing; Al
2o
3content is on the low side, and slag steel level of response is aggravated, and alloy consumption increases.4) oxidisability of slag is higher, and slag is more easily oxidized molten steel, causes Al recovery rate to reduce, Al in slag
2o
3content raises; Cause slag absorb inclusion thing ability to decline on the one hand, a large amount of dispersion oxidation aluminum inclusion can be generated in molten steel, the magnetic property of deteriorated finished strip on the other hand.
Molten steel after above-mentioned steps, first carries out dark decarburization, after decarburization terminates, by carbon content control≤0.005% of molten steel in RH refining (vacuum circulation degassing refining) process.Then, adopt in molten steel and add ferrosilicon, ferro-aluminum or ferromanganese and carry out deoxidation alloying process, selecting to add type can any one or any two kinds of combination in three kinds of iron, also three kinds of iron all can be added.Thereafter the Calcium treatment agent that some amount contains calcium constituent or calcium alloy is added, Calcium treatment is carried out to molten steel, with the inclusion reduced or improve in steel, the chemical composition percent mass proportioning of Calcium treatment agent is: Ca:5 ~ 45%, Si:10 ~ 35%, Mg:1 ~ 10%, Al:1 ~ 10%, P, below S:0.1%, and surplus is Fe and inevitable other elements.The size range of Calcium treatment agent is 10 ~ 60mm.The reason of this Composition Design is: if the calcium contents in Calcium treatment agent is too low, can not by due inclusion removal; If the calcium contents in Calcium treatment agent is too high, molten steel can be caused again to react violent, generate a large amount of calcium steam instantaneously and be pumped, due inclusion can not be removed equally.Consider calcium constituent can also and other oxide compound combine aluminate to be transformed into and be easy to be polymerized the calcium-aluminate of growing up.Therefore Mg, Al element containing certain content in calcium alloy.The reason that size range carries out controlling is: Calcium treatment agent is entered in the molten steel of certain depth and participates in reaction to guarantee that reaction process is lasting, steady.
The interpolation quantity of Calcium treatment agent is between 0 ~ 2.0kg Calcium treatment agent/t steel.Preferred value is 0.3 ~ 1.0kg Calcium treatment agent/t steel.Reason is: after carrying out deoxidation alloying process, the tufted Al of deoxidation products mainly reduced size
2o
3, this inclusion not easily floats and removes.Therefore, must guarantee a considerable amount of calcium alloy addition, after guaranteeing that calcium alloy adds, the abundant circulation of molten steel evenly can remove steel inclusion to greatest extent simultaneously.When Calcium treatment agent add quantity exceed 2.0kg/t steel time, molten steel can be caused to be clamminess, and Molten Steel Flow is deteriorated, and regenerates CaS and be mingled with, and is unfavorable for the removal of steel inclusion.After adding calcium alloy, RH refining degassing time at least controls at 3min or more.
In molten steel, each multi-element chemical composition principle of design is as follows:
1) C hinders finished product grain growth strongly, and easily cause the iron loss of steel increase and produce magnetic aging, and bring difficulty to follow-up decarburization, therefore, after the dark decarburization of RH vacuum circulation degassing refining, the content of C must be strict controlled in less than 0.005%.
2) Si can improve base resistivity, effectively reduces the iron loss of steel.Si content higher than 1.6% time, significantly can reduce the magnetic strength of steel; And lower than 0.2% time, do not have again the effect significantly reducing iron loss, therefore Si controlled: 0.2 ~ 1.6%.
3) Mn and S combines and generates MnS, effectively can reduce the harm to magnetic, improve electrical steel condition of surface simultaneously, reduce hot-short.Therefore, be necessary the Mn content of interpolation more than 0.2%, and higher than more than 1.0% Mn content, easily destroy recrystallization texture, significantly can increase again the manufacturing cost of steel.By the scope control of Mn 0.2 ~ 1.0%.
4) phosphorus can improve the processibility of steel plate, but during more than 0.2%, makes the cold-rolling workability deterioration of steel plate on the contrary, so P need control below 0.2%.
5) when S content is more than 0.005%, the precipitates such as MnS will be made greatly to increase, strongly hinder grain growth, worsen the magnetic of steel, so S need control below 0.005%.
6) Al increases resistive element, simultaneously for the deep deoxidation of electrical steel.When Al content higher than 0.6% time, can cause continuous casting difficulty, magnetic strength significantly reduces; And Al content lower than 0.2% time, significantly can reduce AlN solid solubility temperature, and cause the magnetic of steel to fluctuate.Therefore the scope of Al is decided to be 0.2 ~ 0.6%.
7) when N content is more than 0.005%, the precipitates such as AlN will be made greatly to increase, strongly hinder grain growth, and worsen the magnetic of steel, need N to control below 0.005%.
8) when O content is more than 0.005%, oxidation type impurity will be made greatly to increase, strongly hinder grain growth, and worsen the magnetic of steel, need O to control below 0.005%.
Compared to prior art, the present invention is from Composition Design aspect, because Si, Al element can significantly improve the resistivity of material, effectively can reduce magnetocrystalline anisotropy, make material more easy magnetization, be improve the most effective element of non-oriented electromagnetic steel sheet magnetic, in steel, therefore add suitable Si element, both improve the magnetic strength of steel, again reduce the iron loss of steel; Appropriate Al element also serves the effect of the deep deoxidation of steel grade while increasing resistance.
From Calcium treatment process aspect, in steel add the effect that Al element has strong deoxidation, but owing to forming deoxidation products Al
2o
3the size be mingled with is less, and quantity is more, is not easy to float to remove in subsequent technique process.Therefore under the prerequisite not adopting normalizing or bell furnace process annealing, when RH refining, utilize calcium constituent to be insoluble to molten steel, and fusing point is low, boiling point is low, easily forms the features such as calcium steam, by adding the Calcium treatment agent containing calcium constituent, making calcium constituent and comprising Al
2o
3combine at interior oxide compound, and act on the oxygen in molten steel, element sulphur inclusiones such as forming oarse-grained complex sulfide, calcium-aluminate mutually, easy floating is removed, and to improve purity of steel, improves the grain fineness number of finished steel plate, controls the form of inclusion and improve the toughness of finished steel plate.
From modifying process aspect, in order to ensure the effect of Calcium treatment in RH refining process, controlled by basicity, oxidisability and the alumina content parameter of pushing up slag for tapping, slag is made not only to be beneficial to absorb inclusion thing but also reduce alloy consumption, also avoid there is high oxidative top slag due to oxidizable molten steel, and cause Al recovery rate to reduce, the situation that alumina content raises.
The present invention is not when adopting normalizing or bell furnace process annealing; make full use of impurity element in calcium constituent and molten steel or inclusion has stronger bonding force; fusing point is low, boiling point is low; easy formation calcium steam and be insoluble to the feature of molten steel; by adding the Calcium treatment agent that calcic has element in RH refining vacuum chamber, before avoiding, line feeding adds the suction nitrogen, secondary oxidation and the slag that produce in calcium and causes molten steel secondary pollution problems.Present invention eliminates the step of normalizing or bell furnace process annealing; Calcium treatment step does not increase the treatment time of RH substantially; obviously can not cause the temperature loss in technique, obtain steel plate inclusion by Calcium treatment and significantly reduce, not only improve purity of steel; also help grain growth; improve the toughness of finished steel plate, there is reduction production cost, reduce the production time; improve the quality of products, improve the benefit of product performance.
Embodiment
Embodiment is carried out according to technical process of the present invention: molten iron, steel scrap are proportionally arranged in pairs or groups, and after 300 tons of converter smeltings, carries out ladle top slag upgrading; After RH refining decarburization terminates, adopt ferrosilicon to carry out deoxidation alloying process, then to add after calcium alloy through degassed in steel, after continuous casting, obtain the strand that 170mm ~ 250mm is thick, 800mm ~ 1400mm is wide.Through the strand of above-mentioned technique, successively through hot rolling, pickling, cold rolling and annealing after obtain product.Comparative example is the product without Calcium treatment.
By HITACHIS4200 scanning electron microscope, the inclusion of observation comparative example (without Calcium treatment) and the corresponding finished product sample of embodiment (through Calcium treatment).Each sample Continuous Observation 10 visual fields.The kind of both statistics inclusion, size and distributed number situation.The comparative example provided by table 1, table 2 and the product of embodiment just content of the present invention are described further for inclusion situation in molten steel.
Table 1
The inclusion kind of table 1 comparative example product sample, size and quantity (individual)
Table 2
The inclusion kind of table 2 embodiment product sample, size and quantity (individual)
The explanation of table 1 and table 2:
From the statistic data of inclusion, in the finished product sample of comparative example, there is AlN, MnS, Cu of a large amount of less than 0.5 μm size
2s type impurity, the inclusion of more than 0.5 μm size, with AlN, MnS duplex impurity or MnS, Cu
2s duplex impurity is main, and quantity is more and size is less, also contains a small amount of oxide inclusion in sample simultaneously.And in the finished product sample of embodiment, almost there is no the inclusion of less than 0.5 μm size, the inclusion of more than 0.5 μm size, based on AlN, CaS, and with a small amount of oxide inclusion and AlN, CaS duplex impurity, its size is relatively large.Its reason is: the molten steel of comparative example, in process of setting, first separates out larger-size oxide inclusion, and then MnS inclusion starts to separate out along with the continuous decline of molten steel temperature, final AlN, Cu
2s inclusion respectively with MnS inclusion for core is separated out.And through the molten steel of embodiment in process of setting, the oxide inclusion of larger particles fully floats, and the binding ability of Ca and S element is much larger than the binding ability between Mn and S element and Cu and S element, therefore the CaS inclusion of fusing point up to 2500 DEG C can preferentially be separated out, thus effectively inhibits MnS, Cu
2the precipitation of S inclusion.Then along with the continuous decline of molten steel temperature, AlN inclusion starts to separate out, because now most of molten steel solidifies, therefore only have a small amount of AlN inclusion can combine with CaS inclusion, form the easy duplex impurity removed that floats that AlN and CaS combines, size is relatively large.
Through above-mentioned technical process, by the electromagnetic performance of 10 comparative examples providing in table 3, table 4 and the chemical composition of embodiment, the control situation of processing parameter and three kinds of steel grade products, content of the present invention is described further.
Table 3
The chemical composition proportioning (mass percent, %) of table 310 comparative example and 10 embodiments
| Sequence number | C | Si | Mn | P | S | Al | O | N | Remarks |
| 1A | 0.002 | 1.40 | 0.28 | 0.013 | 0.0028 | 0.29 | 0.0014 | 0.0013 | Comparative example |
| 2A | 0.0013 | 1.37 | 0.23 | 0.012 | 0.0023 | 0.26 | 0.0014 | 0.0015 | Comparative example |
| 3B | 0.0036 | 0.81 | 0.26 | 0.024 | 0.0029 | 0.42 | 0.0017 | 0.0011 | Comparative example |
| 4B | 0.0016 | 0.95 | 0.23 | 0.014 | 0.0019 | 0.26 | 0.0014 | 0.0011 | Comparative example |
| 5C | 0.0015 | 0.21 | 0.33 | 0.080 | 0.0023 | 0.27 | 0.0019 | 0.0011 | Comparative example |
| 6A | 0.0011 | 1.26 | 0.24 | 0.013 | 0.0032 | 0.28 | 0.0012 | 0.0015 | Comparative example |
| 7A | 0.0013 | 1.30 | 0.26 | 0.013 | 0.0028 | 0.29 | 0.0014 | 0.001 | Comparative example |
| 8A | 0.0022 | 1.17 | 0.28 | 0.020 | 0.0032 | 0.27 | 0.0008 | 0.0012 | Comparative example |
| 9A | 0.0012 | 1.32 | 0.25 | 0.011 | 0.0034 | 0.29 | 0.0009 | 0.0012 | Comparative example |
| 10B | 0.0039 | 0.62 | 0.25 | 0.021 | 0.0024 | 0.42 | 0.0015 | 0.0012 | Embodiment |
| 11B | 0.0016 | 0.82 | 0.26 | 0.021 | 0.0025 | 0.56 | 0.0006 | 0.0008 | Embodiment |
| 12B | 0.0025 | 0.92 | 0.24 | 0.020 | 0.0038 | 0.46 | 0.0014 | 0.0012 | Embodiment |
| 13B | 0.0041 | 1.17 | 0.93 | 0.020 | 0.0028 | 0.27 | 0.0011 | 0.0027 | Embodiment |
| 14C | 0.0044 | 0.21 | 0.32 | 0.084 | 0.0036 | 0.33 | 0.0018 | 0.0024 | Embodiment |
| 15C | 0.0011 | 0.46 | 0.24 | 0.074 | 0.0024 | 0.26 | 0.0014 | 0.0009 | Embodiment |
| 16C | 0.0009 | 0.24 | 0.64 | 0.084 | 0.0030 | 0.29 | 0.0019 | 0.0019 | Embodiment |
| 17C | 0.0016 | 0.24 | 0.32 | 0.084 | 0.0024 | 0.26 | 0.0022 | 0.0019 | Embodiment |
| 18A | 0.0018 | 1.31 | 0.27 | 0.020 | 0.0033 | 0.29 | 0.0025 | 0.0013 | Embodiment |
| 19A | 0.0021 | 1.57 | 0.43 | 0.016 | 0.0028 | 0.52 | 0.0009 | 0.0014 | Embodiment |
| 20A | 0.0013 | 1.49 | 0.87 | 0.018 | 0.0032 | 0.28 | 0.0011 | 0.0012 | Embodiment |
Table 4
The processing parameter of table 410 comparative example and 10 embodiments and the electromagnetic performance of three kinds of steel grade products
The explanation of table 3 and table 4:
In table, data represent A, B, C tri-class steel grade respectively.A kind steel: iron loss≤4.0W/kg, magnetic strength >=1.705T; B kind steel: iron loss≤4.5W/kg, magnetic strength >=1.730T; C kind steel: iron loss≤5.5W/kg, magnetic strength >=1.745T.Show according to embodiment, in order to meet molten steel high purity, reduce operation, avoid the demand of secondary oxidation, by ladle top slag modifying process and the calcium added in RH refining process or calcium alloy carry out Calcium treatment, and the parameters such as the oxidisability of the basicity of the strict slag controlled in modifying process, alumina content, slag and in Calcium treatment calcium or calcium alloy chemical composition and add the parameters such as quantity and realize.
Claims (4)
1. a smelting process for the non-oriented electromagnetic steel sheet of excellent magnetic, it comprises the steps,
1) hot metal pretreatment, slagging-off;
2) loading smelting;
3), after smelting, in molten steel, each multi-element chemical composition percent mass proportioning is: C≤0.05%, Si:0.2 ~ 1.6%, Mn:0.2 ~ 1.0%, P≤0.2%, S≤0.005%, Al:0.2 ~ 0.6%, N≤0.005%, O≤0.005%, surplus is Fe and inevitable inclusion;
4) converter tapping, carries out modifying process to ladle top slag, is controlled by the mass fraction of the ladle top slag chemical composition after process to be: CaO:15 ~ 35 part, SiO
2: 7 ~ 25 parts, Al
2o
3: 20 ~ 45 parts, T.Fe+MnO≤5 part, and CaO/SiO
2: 1 ~ 2;
5) RH vacuum circulation degassing refining: first carry out dark carbonization treatment, by carbon content control≤0.005%; Then deoxidation alloying process is carried out; Again carry out Calcium treatment, Calcium treatment agent is added in molten steel, the percent mass proportioning of its chemical composition is: Ca:5 ~ 45%, Si:10 ~ 35%, Mg:1 ~ 10%, Al:1 ~ 10%, P≤0.1%, S≤0.1%, surplus is Fe and inevitable all the other elements, size range is 10 ~ 60mm, and addition controls be greater than 0 kilogram/steel per ton and be less than 2.0 kilograms/steel per ton; Final purification is degassed;
6) base is poured into;
7) hot rolling;
8) pickling;
9) cold rolling;
10) anneal;
11) coating.
2. the smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic as claimed in claim 1, it is characterized in that, the addition of described Calcium treatment agent is 0.3 ~ 1.0 kilogram/steel per ton.
3. the smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic as claimed in claim 1, is characterized in that, described refining degassing time controls to be >=3min.
4. the smelting process of the non-oriented electromagnetic steel sheet of excellent magnetic as claimed in claim 1, is characterized in that, described deoxidation alloying process at least add in ferrosilicon, ferro-aluminum or ferromanganese any one.
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