CN102634742B - Preparation method of oriented electrical steel free of Al - Google Patents
Preparation method of oriented electrical steel free of Al Download PDFInfo
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- CN102634742B CN102634742B CN 201210096580 CN201210096580A CN102634742B CN 102634742 B CN102634742 B CN 102634742B CN 201210096580 CN201210096580 CN 201210096580 CN 201210096580 A CN201210096580 A CN 201210096580A CN 102634742 B CN102634742 B CN 102634742B
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Abstract
The invention discloses oriented electrical steel free of Al for improving magnetic induction and reducing iron loss and a preparation method thereof, and belongs to the technical field of the electrical steel of a metal material. The preparation method comprises the steps of: feeding a continuously cast blank into a heating furnace to heat, carrying out hot rolling and coiling to obtain a hot rolled plate, and then preserving heat, so a layer of recrystallized grains of regular cubic structure is formed on the surface of the hot rolled plate; and scouring iron scale on the surface of the hotrolled plate and carrying out cold rolling and annealing to obtain the electrical steel by. On one hand, the non-oriented electrical steel disclosed by the invention is equivalent to iron loss of a non-normalizing process, and the magnetic induction is much better than that in a traditional technology; if a normalizing process is carried out, the iron loss is reduced and lower than that in the traditional technology, and the magnetic induction is further increased; and on the other hand, the magnetic inducing property is improved while the alloy cost is reduced.
Description
Technical field
The invention belongs to metallic substance electrical steel technical field, relate to a kind of preparation method of non-oriented electrical steel.
Background technology
Electrical steel is the very low silicon-iron soft magnetic alloy of carbon containing, is indispensable important materials in electric power, electronics and the war industry.According to statistics, the ultimate production of whole world electrical steel in 2000 is 671.4 ten thousand tons, has surpassed 8,000,000 tons by 2005.The consumption of domestic market is far above 3,000,000 tons at present.Wherein, non orientating silicon steel is the electric motor of working in rotatingfield and the core material of generator amature, requires good magnetic performance and processing performance.In recent years, along with the development of motor high speed and miniaturization, the performance requriements of non orientating silicon steel is had higher requirement, under at high frequency, have low iron loss and high magnetic induction etc.
The method of traditional raising Si≤1% non-oriented electrical steel magnetic magnetic property has: the content of impurity elements such as a, reduction C, N, S, O, Ti, reduce fine foreign matter quantity, thereby reduce iron loss, increase magnetic strength, but perfect with the pure technology of steel-making, it is quite limited that this method improves performance; B, interpolation alloying element Sn, Sd by gathering partially of element, improves recrystallization texture, increases magnetic strength, but increases cost of alloy simultaneously, and gather partially and also have certain unstable, and the poly-partially coating shedding that makes easily of uneven surfaces; C, hot-rolled sheet is carried out normalizing handle, improve hot-rolled sheet tissue and texture, the while has also increased the technology cost; D, with aluminium for silicon, the reduction magnetic strength of when reducing iron loss, trying one's best few.But aluminium has dual function to the non orientating silicon steel magnetic property, and on the one hand, aluminium can increase resistance, dwindles the austenite phase region, promote grain growth, thereby certain advantageous effect is arranged.But the effect of aluminium will be subjected to the influence of nitrogen content in the silicon steel, and aluminium easily forms the AlN precipitated phase with nitrogen, and the magnetic property of siliconized plate is descended.When the AlN particle size of separating out during less than 0.5 μ m, their pinning crystal boundaries hinder grain growth, thereby increase iron loss.But when the AlN particle size of separating out during greater than 1 μ m, they are very light to the pinning effect of crystal boundary, and are therefore very little to the magnetic property influence.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of non-oriented electrical steel and preparation method thereof that magnetic strength reduces the no Al of iron loss that improves.
Concrete technical scheme is as follows:
A kind of non-oriented electrical steel that does not have Al comprises, its continuously cast bloom is by mass percentage:
C≤0.005％ Si 0.1～1.0％ Mn 0.30～1.2％ Al≤0.01％
P 0.02～0.1％ S≤0.01％ N≤0.008％ O≤0.015％ B≤
0.002％ Sn≤0.003％ Sb≤0.003％ Nb≤0.003％ Ti≤0.003％，
All the other are Fe.
A kind of preparation method who does not have the non-oriented electrical steel of Al comprises the steps:
To be C≤0.005% by mass percentage, Si 0.1～1.0%, Mn 0.30～1.2%, Al≤0.01%, P 0.02～0.1%, S≤0.01%, N≤0.008%, O≤0.015%, B≤0.002%, Sn≤0.003%, Sb≤0.003%, Nb≤0.003%, Ti≤0.003%, all the other send into the process furnace heating for the continuously cast bloom of Fe, through hot rolling, obtain hot-rolled sheet after batching, insulation then, make described hot-rolled sheet surface form the cubic texture recrystal grain of one deck rule, the scale on surface of described hot-rolled sheet is cleaned in pickling, again through cold rolling, both got after the annealing.
Further, the Heating temperature of described continuously cast bloom is 1000～1150 ℃.
Further, the finish rolling start rolling temperature of described hot rolling is 1000～1020 ℃, and the finish rolling finishing temperature is 870 ℃～920 ℃.
Further, described temperature of batching is 680 ℃～730 ℃.
Further, the time of described insulation is greater than 2h.
Further, before described acid pickling step, described hot-rolled sheet is carried out normalizing.
Further, described normalizing temperature is 880～950 ℃, and the normalizing time is 120～300s, and atmosphere is pure dried N
2Gas.
Further, in described acid pickling step, Acidwash solution is that concentration is 4% sulphuric acid soln, and the temperature of pickle solution is 70～90 ℃, and the pickling time is 120～600s.
Further, the temperature of described annealing is 810～860 ℃, and annealing time is 120～300s, and the atmosphere of annealing is H
2And N
2Mixed gas, wherein, H
2Ratio be 10～40%.
Non-oriented electrical steel provided by the invention contains the Al non-oriented electrical steel with equal Si content through traditional prepared and compares, and on the one hand, the iron loss of normalizing process is unsuitable with it in this invention, and magnetic strength is much better than traditional technology; After making a practice of technology, can iron loss reduce, be lower than the traditional technology iron loss, magnetic strength is further increased.On the other hand, when reducing cost of alloy, improved magnetic property, especially magnetic induction performance.
Description of drawings
The recrystallize column crystal granulosa figure of a kind of surperficial cubic texture that behind hot rolling reeling, forms that Fig. 1 provides for the embodiment of the invention.
Embodiment
Embodiment 1:
The non-oriented electrical steel of a kind of Al of nothing that the embodiment of the invention provides, the chemical ingredients of its continuously cast bloom (%) is shown in the experimental group in the table 1, chooses control group in addition, the chemical ingredients of its continuously cast bloom (%) is shown in the control group in the table 1.
The main chemical compositions of table 1 continuously cast bloom (%)
| Experimental group | Control group | |
| C | 0.0026 | 0.0025 |
| Si | 0.4 | 0.42 |
| Mn | 0.61 | 0.54 |
| Al | <0.005 | 0.33 |
| P | 0.036 | 0.04 |
| S | 0.0045 | 0.0025 |
| N | 0.0036 | 0.003 |
| O | ＜0.005 | ＜0.005 |
| B | 0.0006 | 0.0008 |
| Sn | ＜0.003 | ＜0.003 |
| Sb | ＜0.003 | ＜0.003 |
| Nb | ＜0.003 | ＜0.003 |
| Ti | 0.0015 | 0.0011 |
| All the other | Fe and impurity | Fe and impurity |
The preparation method of experimental group is:
(1) gets experimental group composition continuously cast bloom, the continuously cast bloom of experimental group is sent into process furnace heating, 1150 ℃ of Heating temperatures;
(2) hot rolling, the finish rolling start rolling temperature of hot rolling is 1020 ℃, finishing temperature is 870 ℃;
(3) batch, the temperature of batching is 710 ℃, obtains hot-rolled sheet then, and wherein, the thickness of hot-rolled sheet is 2.3mm;
(4) insulation, the time 2h of insulation makes the hot-rolled sheet surface form the cubic texture recrystal grain of one deck rule.
(5) normalizing is pure dried N in atmosphere
2Gas carries out normalizing, and the normalizing temperature is 900 ℃, and annealing time is 300s;
(6) pickling is that 4% sulphuric acid soln carries out pickling with concentration, and the temperature of pickle solution is 70 ℃, and the pickling time is 600s.Clean the scale on surface of described hot-rolled sheet;
(7) cold rolling, the hot-rolled sheet after pickling is carried out cold rolling, steel plate is rolled to thickness 0.50mm;
(8) annealing, wherein, 820 ℃ of annealing temperatures, annealing time is 120s, annealing atmosphere is H
2And N
2Mixed gas, wherein, H
2Ratio be 25%, require to be cooled to 500 ℃ with 50 ℃/h of speed of cooling, both cool to the furnace then after the room temperature.
Technology obtains sample A-1 through above-mentioned (1)～(8); Through (1)～(4) and (6)～(8) technology, do not carry out (5) normalizing process, obtain sample A-2.In addition, A-1 is than the pickling time lengthening 80s of the hot-rolled sheet of A-2.
The preparation method of experimental group is:
Get control group composition continuously cast bloom, same, through experimental group preparation method's (1)～(4) and (6)～(8) technology, do not carry out (5) normalizing process, obtain sample B-2.Form the product sample with three and carry out Magnetic Measurement, typical magnetic property sees Table 2.
Table 2 experimental technique and magnetic property
As can be seen from Table 2, under same process, just do not make a practice of step, the A-2 of no Al compares with the B-2 that contains Al, and Si+Al content reduces 0.3%, though iron loss is suitable, but magnetic strength improves 0.04T, and behind the hot rolling reeling of A-2, the hot-rolled sheet surface forms the cubic texture recrystal grain of one deck rule, concrete shape has effectively improved magnetic property referring to Fig. 1 when reducing cost of alloy;
Compare with A-2 from the A-1 of the identical component strand of experimental group, make a practice of the A-1 iron loss of handling and reduce 0.5W/Kg, magnetic strength improves 0.01T, reaches 1.793T, and the potentiality that magnetic property improves are given full play to.No Al composition design of the present invention and special process combination can obtain the product than high magnetic characteristics when reducing cost of alloy.
Embodiment 2:
The non-oriented electrical steel of another no Al that the embodiment of the invention provides, (%) is as follows for the chemical ingredients of its continuously cast bloom:
C 0.005 Si 0.1 Mn 1.2 Al 0.01
P 0.1 S 0.01 N 0.008 O 0.015 B 0.002
Sn≤0.003 Sb≤0.003 Nb≤0.003 Ti≤0.003
All the other are Fe and impurity.
The preparation method is:
(1) gets experimental group composition continuously cast bloom, the continuously cast bloom of experimental group is sent into process furnace heating, 1000 ℃ of Heating temperatures;
(2) hot rolling, the finish rolling start rolling temperature of hot rolling is 1000 ℃, finishing temperature is 920 ℃;
(3) batch, the temperature of batching is 680 ℃, obtains hot-rolled sheet then, and wherein, the thickness of hot-rolled sheet is 2.3mm;
(4) insulation, the time 2h of insulation makes the hot-rolled sheet surface form the cubic texture recrystal grain of one deck rule.
(5) normalizing is pure dried N in atmosphere
2Gas carries out normalizing, and the normalizing temperature is 950 ℃, and soaking time is 120s;
(6) pickling is that 4% sulphuric acid soln carries out pickling with concentration, and the temperature of pickle solution is 90 ℃, and the pickling time is 120s, cleans the scale on surface of described hot-rolled sheet;
(7) cold rolling, the hot-rolled sheet after pickling is carried out cold rolling, steel plate is rolled to thickness 0.50mm;
(8) annealing, wherein, annealing temperature is 810 ℃, and annealing time is 120s, and annealing atmosphere is H
2And N
2Mixed gas, wherein, H
2Ratio be 10%, require to be cooled to 500 ℃ with 50 ℃/h of speed of cooling, both cool to the furnace then after the room temperature.
Embodiment 3:
The non-oriented electrical steel of a kind of Al of nothing that the embodiment of the invention also provides, (%) is as follows for the chemical ingredients of its continuously cast bloom:
C 0.001 Si 1 Mn 0.3 Al 0.005
P 0.02 S 0.005 N 0.004 O 0.008 B 0.001
Sn≤0.003 Sb≤0.003 Nb≤0.003 Ti≤0.003
All the other are Fe and impurity.
The preparation method is:
(1) gets experimental group composition continuously cast bloom, the continuously cast bloom of experimental group is sent into process furnace heating, 1150 ℃ of Heating temperatures;
(2) hot rolling, the finish rolling start rolling temperature of hot rolling is 1020 ℃, finishing temperature is 870 ℃;
(3) batch, the temperature of batching is 730 ℃, obtains hot-rolled sheet then, and wherein, the thickness of hot-rolled sheet is 2.3mm;
(4) insulation, the time 3h of insulation makes the hot-rolled sheet surface form the cubic texture recrystal grain of one deck rule.
(5) pickling is that 4% sulphuric acid soln carries out pickling with concentration, and the temperature of pickle solution is 70 ℃, and the pickling time is 600s, cleans the scale on surface of described hot-rolled sheet;
(6) cold rolling, the hot-rolled sheet after pickling is carried out cold rolling, steel plate is rolled to thickness 0.50mm;
(7) annealing, wherein, annealing temperature is 860 ℃, and annealing time is 300s, and annealing atmosphere is H
2And N
2Mixed gas, wherein, H
2Ratio be 40%, require to be cooled to 500 ℃ with 50 ℃/h of speed of cooling, both cool to the furnace then after the room temperature.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. a preparation method who does not have the non-oriented electrical steel of Al is characterized in that, comprises the steps:
To be C≤0.005% by mass percentage, Si0.1～1.0%, Mn0.30～1.2%, Al≤0.01%, P0.02～0.1%, S≤0.01%, N≤0.008%, O≤0.015%, B≤0.002%, Sn≤0.003%, Sb≤0.003%, Nb≤0.003%, Ti≤0.003%, all the other send into the process furnace heating for the continuously cast bloom of Fe, through hot rolling, obtain hot-rolled sheet after batching, insulation then, make described hot-rolled sheet surface form the cubic texture recrystal grain of one deck rule, the scale on surface of described hot-rolled sheet is cleaned in pickling, again through cold rolling, both got after the annealing;
Wherein, 1000～1150 ℃ of the Heating temperatures of described continuously cast bloom, the finish rolling start rolling temperature of described hot rolling is 1000～1020 ℃, and the finish rolling finishing temperature is 870 ℃～920 ℃, and described temperature of batching is 680 ℃～730 ℃, and the time of described insulation is greater than 2h.
2. method according to claim 1 is characterized in that, before described acid pickling step described hot-rolled sheet is carried out normalizing.
3. method according to claim 2 is characterized in that, described normalizing temperature is 880～950 ℃, and the normalizing time is 120～300s, and atmosphere is pure dried N
2Gas.
4. method according to claim 1 is characterized in that, in described acid pickling step, Acidwash solution is that concentration is 4% sulphuric acid soln, and the temperature of pickle solution is 70～90 ℃, and the pickling time is 120～600s.
5. method according to claim 1 is characterized in that, the temperature of described annealing is 810～860 ℃, and annealing time is 120～300s, and the atmosphere of annealing is H
2And N
2Mixed gas, wherein, H
2Ratio be 10～40%.
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| JP2014177684A (en) * | 2013-03-15 | 2014-09-25 | Jfe Steel Corp | Nonoriented electromagnetic steel sheet excellent in high frequency iron loss property |
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| CN113403537B (en) * | 2021-06-17 | 2023-01-31 | 江苏省沙钢钢铁研究院有限公司 | Non-oriented silicon steel and production method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: No. 68, Shijingshan District Road, Beijing, Beijing Patentee before: Capital Iron & Steel General Company |