CN115679204A - Production process of copper-containing oriented silicon steel - Google Patents
Production process of copper-containing oriented silicon steel Download PDFInfo
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- CN115679204A CN115679204A CN202211133487.1A CN202211133487A CN115679204A CN 115679204 A CN115679204 A CN 115679204A CN 202211133487 A CN202211133487 A CN 202211133487A CN 115679204 A CN115679204 A CN 115679204A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 70
- 239000010949 copper Substances 0.000 title claims abstract description 36
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000000137 annealing Methods 0.000 claims abstract description 78
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 66
- 239000010959 steel Substances 0.000 claims abstract description 66
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 30
- 238000002955 isolation Methods 0.000 claims abstract description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 18
- 238000005097 cold rolling Methods 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000005261 decarburization Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 238000005554 pickling Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 abstract description 13
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005406 washing Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 46
- 229910052742 iron Inorganic materials 0.000 description 20
- 230000010287 polarization Effects 0.000 description 20
- 238000001953 recrystallisation Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 15
- 239000003112 inhibitor Substances 0.000 description 13
- 239000013078 crystal Substances 0.000 description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 238000009826 distribution Methods 0.000 description 7
- 229910010413 TiO 2 Inorganic materials 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 6
- 230000002401 inhibitory effect Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000036961 partial effect Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Manufacturing Of Steel Electrode Plates (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention provides a production process of copper-containing oriented silicon steel, which comprises the following steps: s1: preparing a steel plate blank, wherein the steel plate blank comprises the chemical components of C, si, mn, als, cu, N, P and S in percentage by weight; the balance of Fe and inevitable impurities; s2: the steel materialHeating, hot rolling, acid washing and first cold rolling a plate blank; s3: performing decarburization treatment on the first cold-rolled sheet; s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3; s5: coating an annealing isolation coating on the surface of the second cold-rolled plate and coiling to obtain a steel coil; s6: and (4) carrying out high-temperature annealing treatment on the steel coil obtained in the step (S5), so that the dew point in a high-temperature annealing furnace is controlled at-20-15 ℃, and the beneficial effects are as follows: the atmosphere humidification is carried out at the temperature rise stage of high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, part of Alr is oxidized and converted into ineffective Al 2 O 3 Thereby playing a role in adjusting the actual content of Alr and stabilizing and improving the magnetic level of the oriented silicon steel.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a production process of copper-containing oriented silicon steel.
Background
The oriented silicon steel is a soft magnetic ferrosilicon alloy material which has a {110} <001> texture (namely a Goss texture) and contains about 3% of silicon, and the oriented silicon steel is subjected to secondary recrystallization in the high-temperature annealing process to obtain a perfect single {110} <001> texture. The crystal plane of the Goss texture is parallel to the rolling plane, and the crystal direction is parallel to the rolling direction, so that the Goss texture has an easy magnetization direction along the rolling direction of the steel plate and has an excellent magnetic level.
Oriented silicon steel is divided into two main categories according to the difference of magnetic properties: common oriented silicon steel (CGO steel for short) and high magnetic induction oriented silicon steel (HGO steel for short). At present, CGO steel produced in China is mainly slab medium-temperature heating copper-containing oriented silicon steel, alN is used as a main inhibitor, and a Cu intermetallic compound is used as an auxiliary inhibitor. In the high-temperature annealing process, the inhibitor AlN is mainly used to inhibit the normal growth of primary crystal grains, so that primary crystal grains (secondary recrystallization nuclei) having {110} <001> texture can engulf other surrounding primary recrystallization crystal grains to undergo abnormal growth, i.e., secondary recrystallization.
The main production characteristics of the Cu-containing oriented silicon steel heated at the medium temperature in the plate blank are as follows: (1) heating the plate blank at a medium temperature; cu is added into the component (2); (3) no normalizing treatment is required; and (4) adopting a secondary cold rolling method. The magnetic level of the product is closely related to the initial Als (acid-soluble aluminum) and N content of the raw steel plate.
Als means that Al is not contained in the steel 2 O 3 The content of Al present in the state includes the Al content in AlN and the solid-solution aluminum (Alr) content. The fine AlN in the steel in dispersion can play a role in inhibiting the growth of crystal grains in the high-temperature annealing process, and the control on the appearance, quantity, size and distribution of the AlN is the key for producing the plate blank for heating the Cu-containing oriented silicon steel at medium temperature. The content of solid solution aluminum (Alr) can influence the appearance, size, distribution and quantity of AlN in the Cu-containing oriented silicon steel heated at the medium temperature in a plate blank, and the change of the content can obviously influence the final magnetic level of a product.
As Als is easy to oxidize, als is lost and the yield is unstable in the smelting and continuous casting processes, so that the content of Als in a product is difficult to stably reach the target value requirement, and a means for effectively adjusting the content of Als in the subsequent production process is lacked. Therefore, the fluctuation of the content of Als existing in the state of solid-solution aluminum (Alr) is one of the main causes of the fluctuation of the magnetic level of the Cu-containing oriented silicon steel heated in a slab at a medium temperature.
In view of the above, it is necessary to develop a process for producing oriented silicon steel containing copper, which can precisely control the content of Alr, so as to solve the above problems.
Disclosure of Invention
The invention aims to disclose a production process of copper-containing oriented silicon steel, which is characterized in that a mixed gas of hydrogen and nitrogen introduced into a specified temperature range (750-950 ℃) in the temperature rise process of a high-temperature annealing process is humidified so as to accurately control the dew point in a high-temperature annealing furnace and further adjust the actual content of Alr.
In order to realize the aim, the invention provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight of 0.02-0.055% of C, si: 2.81-3.60 percent of Mn, 0.10-0.30 percent of Mn, 0.008-0.026 percent of Als, 0.4-0.6 percent of Cu, 0.006-0.012 percent of N, P: less than or equal to 0.050 percent and less than or equal to 0.015 percent of S; the balance of Fe and inevitable impurities;
s2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate;
s3: performing decarburization treatment on the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at 750 ℃ of high-temperature annealing
And a temperature rise stage of-950 ℃, humidifying the introduced mixed gas of hydrogen and nitrogen, and controlling the dew point in the high-temperature annealing furnace at-20-15 ℃.
Preferably, the calculation formula of the content of Alr in the steel slab is as follows: alr = Als- (27/14) × N.
Preferably, the first cold-rolled sheet has a thickness of 0.5mm to 0.7mm.
Preferably, the second cold-rolled sheet has a thickness of 0.22mm to 0.36mm.
Preferably, the annealing separator coating comprises MgO and TiO 2 。
Preferably, the moisture content of the annealing isolation coating is 2% -3.5%.
Preferably, when the Alr content is less than or equal to 0.00 percent, the dew point in the high-temperature annealing furnace is controlled between minus 20 ℃ and minus 5 ℃.
Preferably, when the Alr content is more than 0.00 percent and less than or equal to 0.0014 percent, the dew point in the high-temperature annealing furnace is controlled to be between 10 ℃ below zero and 5 ℃.
Preferably, when the Alr content is more than or equal to 0.0015% and less than or equal to 0.0029%, the dew point in the high-temperature annealing furnace is controlled to be between-5 ℃ and 10 ℃.
Preferably, when the Alr content is more than or equal to 0.0030 percent, the dew point in the high-temperature annealing furnace is controlled at 0-15 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) The atmosphere humidification (humidification treatment by introducing hydrogen and nitrogen mixture) is carried out in the temperature rise stage (750-950 ℃) of high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, partial Alr is oxidized and converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual content of Alr, so that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and the effects of stabilizing and improving the magnetic level of the oriented silicon steel are achieved.
(2) The dew point (water vapor content) of the gas in the furnace at the temperature rise stage of 750-950 ℃ in the high-temperature annealing is adjusted to oxidize Alr in different degrees, so that the actual Alr content before the secondary recrystallization of the steel reaches a reasonable range, and the aims of stabilizing and improving the magnetic level of the product are fulfilled.
Detailed Description
The present invention is described in detail with reference to the embodiments, but it should be understood that these embodiments are not intended to limit the present invention, and that the functional equivalents and the structural equivalents thereof, which are equivalent to those of ordinary skill in the art, may be modified or substituted by those of ordinary skill in the art.
In the description of the present invention, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated to facilitate description of the invention and to simplify description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The following describes the implementation of the present invention by using several embodiments.
The first embodiment is as follows:
the embodiment I provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight, 0.054% of C, si:3.47%, mn 0.29%, als 0.0236%, cu 0.58%, N0.0096%, P:0.048 percent of S, 0.0135 percent of S and the balance of Fe and inevitable impurities. Specifically, converter steelmaking, vacuum furnace refining and continuous casting are carried out to obtain a steel plate blank, and the Alr content calculation formula in the steel plate blank is as follows: alr = Als- (27/14) × N =0.0236% - (27/14) × 0.0096% =0.0051%.
S2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate, wherein the thickness of the first cold-rolled plate is 0.65mm;
s3: decarbonizing the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet, wherein the thickness of the second cold-rolled sheet is 0.3mm;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil, wherein the annealing isolation coating comprises MgO and TiO 2 The moisture content of the annealing isolation coating is 3.3%;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at the temperature of 750 DEG C
And a temperature rising stage of 950 ℃, humidifying the introduced mixed gas of hydrogen and nitrogen, and controlling the dew point in the high-temperature annealing furnace to be 3-15 ℃.
AlN is a main inhibitor of the Cu-containing medium-temperature heating type oriented silicon steel, and plays a role in inhibiting the growth of crystal grains before the secondary recrystallization temperature of high-temperature annealing; and (3) after the specific temperature is reached, decomposing AlN, starting abnormal growth of Gaussian grains, starting secondary recrystallization, and finally forming the single-orientation oriented silicon steel. Alr is the portion of Als (acid-soluble aluminum) where AlN is not formed; alr influences the precipitation distribution of the AlN inhibitor, and the content of the Alr has great influence on the magnetic level of the product.
Through the steps S1-S6, especially in the step S6, the atmosphere is humidified (the humidification treatment is carried out by the introduced hydrogen and nitrogen mixed gas) in the temperature rise stage (750-950 ℃) of the high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, part of Alr is oxidized and converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual Alr content, ensures that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and has the functions of stabilizing and improving the magnetic level of the oriented silicon steel.
And adjusting the dew point of gas in the furnace in the temperature rise stage of 750-950 ℃ in high-temperature annealing to oxidize Alr to different degrees, so that the actual Alr content before secondary recrystallization of the steel reaches a reasonable range, and the aims of stabilizing and improving the magnetic level of the product are fulfilled.
By detecting the average iron loss and the average magnetic polarization strength of the oriented silicon steel in the first example and comparing the average iron loss and the average magnetic polarization strength with the oriented silicon steel produced in the first comparative example by the conventional high-temperature annealing process (other process conditions are the same as those in the first example), the comparison result is shown in table 1, and the average magnetic polarization strength of the oriented silicon steel in the first example is improved, and the average iron loss is reduced.
Table 1 properties of example one and comparative example one
| Evaluation index | Example one | Comparative example 1 |
| Average iron loss (P) 1.7/50 ,W/kg) | 1.06 | 1.44 |
| Average magnetic polarization intensity (J) 800 ,T) | 1.88 | 1.78 |
Example two:
the second embodiment provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight of 0.0483% of C, si:3.27%, mn 0.24%, als 0.0208%, cu 0.51%, N0.
0117%, P:0.036 percent of S, 0.0101 percent of S and the balance of Fe and inevitable impurities. Specifically, converter steelmaking, vacuum furnace refining and continuous casting are carried out to obtain a steel plate blank, and the Alr content calculation formula in the steel plate blank is as follows: alr = Als- (27/14) × N =0.0208% - (27/14) × 0.0117% = -0.00176%, and when the Alr content is less than or equal to 0.00%, it means that the N content is excessive.
S2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate, wherein the thickness of the first cold-rolled plate is 0.63mm;
s3: performing decarburization treatment on the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet, wherein the thickness of the second cold-rolled sheet is 0.27mm;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil, wherein the annealing isolation coating comprises MgO and TiO 2 The moisture content of the annealing isolation coating is 2.9%;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at 750 ℃ of high-temperature annealing
And in the temperature rising stage of-950 ℃, humidifying the introduced mixed gas of hydrogen and nitrogen to control the dew point in the high-temperature annealing furnace to be-18 ℃ to-6 ℃.
AlN is a main inhibitor of the Cu-containing medium-temperature heating type oriented silicon steel, and plays a role in inhibiting the growth of crystal grains before the secondary recrystallization temperature of high-temperature annealing; and (3) after the specific temperature is reached, decomposing AlN, starting abnormal growth of Gaussian grains, starting secondary recrystallization, and finally forming the single-orientation oriented silicon steel. Alr is the portion of Als (acid-soluble aluminum) where AlN is not formed; alr influences the precipitation distribution of the AlN inhibitor, and the content of the Alr has great influence on the magnetic level of the product.
Through the steps S1 to S6, particularly in the step S6, the atmosphere humidification (humidification treatment is carried out by introducing the mixed gas of hydrogen and nitrogen) is carried out in the temperature rise stage (750 ℃ to 900 ℃) of the high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, partial Alr is oxidized, and the Al is converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual Alr content, ensures that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and has the functions of stabilizing and improving the magnetic level of the oriented silicon steel.
Adjusting the dew point of the gas in the furnace in the temperature rise stage of 750-900 ℃ in high-temperature annealing to oxidize Alr to different degrees, so that the actual Alr content before secondary recrystallization of the steel reaches a reasonable range, and the purposes of stabilizing and improving the magnetic level of the product are achieved.
By detecting the average iron loss and the average magnetic polarization strength of the oriented silicon steel of the second example and comparing the average iron loss and the average magnetic polarization strength with the oriented silicon steel produced by the conventional high-temperature annealing process of the second comparative example (other process conditions are the same as those of the second example), the comparison result is shown in table 2, the average magnetic polarization strength of the second example is improved, and the average iron loss is reduced.
TABLE 2 Properties of example two and comparative example two
| Evaluation index | Practice ofExample two | Comparative example No. two |
| Average iron loss (P) 1.7/50 ,W/kg) | 1.03 | 1.08 |
| Average magnetic polarization intensity (J) 800 ,T) | 1.89 | 1.87 |
Example three:
the third embodiment provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight of 0.0355% of C, si:3.08%, mn 0.21%, als 0.0167%, cu 0.47%, N0.0081%, P:0.023 percent, 0.0084 percent of S and the balance of Fe and inevitable impurities. Specifically, converter steelmaking, vacuum furnace refining and continuous casting are carried out to obtain a steel plate blank, and the Alr content calculation formula in the steel plate blank is as follows: alr = Als- (27/14) × N =0.0167% - (27/14) × 0.0081% =0.0011%.
S2: heating, hot rolling, acid washing and first cold rolling the steel plate blank to obtain a first cold-rolled plate, wherein the thickness of the first cold-rolled plate is 0.63mm;
s3: performing decarburization treatment on the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet, wherein the thickness of the second cold-rolled sheet is 0.23mm;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil, wherein the annealing isolation coating comprises MgO and TiO 2 The moisture content of the annealing isolation coating is 2.4%;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at the temperature of 750 DEG C
And in the temperature rising stage of about 930 ℃, humidifying the introduced mixed gas of hydrogen and nitrogen to control the dew point in the high-temperature annealing furnace to be between 7 ℃ below zero and 3 ℃.
AlN is a main inhibitor of the Cu-containing medium-temperature heating type oriented silicon steel, and plays a role in inhibiting the growth of crystal grains before the secondary recrystallization temperature of high-temperature annealing; and (3) after the specific temperature is reached, decomposing AlN, starting abnormal growth of Gaussian grains, starting secondary recrystallization, and finally forming the single-orientation oriented silicon steel. Alr is the portion of Als (acid-soluble aluminum) where AlN is not formed; alr influences the precipitation distribution of the AlN inhibitor, and the content of the Alr has great influence on the magnetic level of the product.
Through the steps S1-S6, especially in the step S6, the atmosphere is humidified (the humidification treatment is carried out by the introduced hydrogen and nitrogen mixed gas) in the temperature rise stage (750-930 ℃) of the high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, partial Alr is oxidized, and the Al is converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual content of Alr, so that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and the effects of stabilizing and improving the magnetic level of the oriented silicon steel are achieved.
And adjusting the dew point of gas in the furnace in the temperature rise stage of 750-930 ℃ during high-temperature annealing to oxidize Alr to different degrees, so that the actual Alr content before secondary recrystallization of the steel reaches a reasonable range, and the aims of stabilizing and improving the magnetic level of the product are fulfilled.
By detecting the average iron loss and the average magnetic polarization strength of the three-dimensional oriented silicon steel in the example and comparing the average iron loss and the average magnetic polarization strength with those of the three-dimensional oriented silicon steel in the comparative example (other process conditions are the same as those of the example), the comparison result is shown in table 3, and the average magnetic polarization strength of the three-dimensional oriented silicon steel in the example is improved, and the average iron loss is reduced.
TABLE 3 Performance of example three versus comparative example three
| Evaluation index | EXAMPLE III | Comparative example No. three |
| Average iron loss (P) 1.7/50 ,W/kg) | 0.99 | 1.06 |
| Average magnetic polarization intensity (J) 800 ,T) | 1.88 | 1.86 |
Example four:
the fourth embodiment provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight 0.0226% of C, si:2.82 percent, 0.12 percent of Mn, 0.0093 percent of Als, 0.42 percent of Cu and 0 percent of N.
0093%, P:0.012%, 0.0063% S, the balance Fe and inevitable impurities. Specifically, converter steelmaking, vacuum furnace refining and continuous casting are carried out to obtain a steel plate blank, and the Alr content calculation formula in the steel plate blank is as follows: alr = Als- (27/14). Times.N =0.0093% - (27/14). Times.0.0093% = -0.0096%, and when the Alr content is less than or equal to 0.00%, it is said that the N content is in excess.
S2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate, wherein the thickness of the first cold-rolled plate is 0.68mm;
s3: performing decarburization treatment on the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet, wherein the thickness of the second cold-rolled sheet is 0.35mm;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil, wherein the annealing isolation coating comprises MgO and TiO 2 The moisture content of the annealing isolation coating is 2.1%;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at 750 ℃ of high-temperature annealing
And (3) a temperature rising stage of 850 ℃, humidifying the introduced mixed gas of hydrogen and nitrogen, and controlling the dew point in the high-temperature annealing furnace to be between-20 ℃ and-10 ℃.
AlN is a main inhibitor of the Cu-containing medium-temperature heating type oriented silicon steel, and plays a role in inhibiting the growth of crystal grains before the secondary recrystallization temperature of high-temperature annealing; and (3) after the specific temperature is reached, decomposing AlN, starting abnormal growth of Gaussian grains, starting secondary recrystallization, and finally forming the single-orientation oriented silicon steel. Alr is the portion of Als (acid-soluble aluminum) where AlN is not formed; alr influences the precipitation distribution of the AlN inhibitor, and the content of the Alr has great influence on the magnetic level of the product.
Through the steps S1-S6, especially in the step S6, the atmosphere is humidified (the humidification treatment is carried out by the introduced hydrogen and nitrogen mixed gas) in the temperature rise stage (750-850 ℃) of the high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, part of Alr is oxidized, and the Alr is converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual Alr content, ensures that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and has the functions of stabilizing and improving the magnetic level of the oriented silicon steel.
Adjusting the dew point of gas in the furnace in the temperature rise stage of 750-850 ℃ in high-temperature annealing to oxidize Alr to different degrees, so that the actual Alr content before secondary recrystallization of the steel reaches a reasonable range, and the aims of stabilizing and improving the magnetic level of the product are fulfilled.
By detecting the average iron loss and the average magnetic polarization strength of the four-oriented silicon steel in the example and comparing the average iron loss and the average magnetic polarization strength with the four-oriented silicon steel produced by the four conventional high-temperature annealing process in the comparative example (other process conditions are the same as those in the example), the comparison result is shown in table 4, the average magnetic polarization strength of the four-oriented silicon steel in the example is improved, and the average iron loss is reduced.
TABLE 4 Performance of example four versus comparative example four
| Evaluation index | Example four | Comparative example No. four |
| Average iron loss (P) 1.7/50 ,W/kg) | 1.33 | 1.46 |
| Average magnetic polarization intensity (J) 800 ,T) | 1.88 | 1.82 |
Example five:
the fifth embodiment provides a production process of copper-containing oriented silicon steel, which comprises the following steps:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight of 0.0318% of C, si:2.94%, mn 0.17%, als 0.0145%, cu 0.45%, N0.
0064%, P:0.008 percent of S, 0.0030 percent of S and the balance of Fe and inevitable impurities. Specifically, converter steelmaking, vacuum furnace refining and continuous casting are carried out to obtain a steel plate blank, and the Alr content calculation formula in the steel plate blank is as follows: alr = Als- (27/14) × N =0.0145% - (27/14) × 0.0064% =0.0022%.
S2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate, wherein the thickness of the first cold-rolled plate is 0.60mm;
s3: decarbonizing the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet, wherein the thickness of the second cold-rolled sheet is 0.23mm;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil, wherein the annealing isolation coating comprises MgO and TiO 2 The moisture content of the annealing isolation coating is 2.6%;
s6: carrying out high-temperature annealing treatment on the steel coil obtained in the step S5 at 750 ℃ of high-temperature annealing
And in the temperature rising stage of 950 ℃, the introduced mixed gas of hydrogen and nitrogen is humidified, so that the dew point in the high-temperature annealing furnace is controlled at-4 ℃ to 8 ℃.
AlN is a main inhibitor of the Cu-containing medium-temperature heating type oriented silicon steel, and plays a role in inhibiting the growth of crystal grains before the secondary recrystallization temperature of high-temperature annealing; and (3) after the specific temperature is reached, decomposing AlN, starting abnormal growth of Gaussian grains, starting secondary recrystallization, and finally forming the single-orientation oriented silicon steel. Alr is the portion of Als (acid-soluble aluminum) where AlN is not formed; alr influences the precipitation distribution of the AlN inhibitor, and the content of the Alr has great influence on the magnetic level of the product.
Through the steps S1-S6, especially in the step S6, the atmosphere is humidified (the humidification treatment is carried out by the introduced hydrogen and nitrogen mixed gas) in the temperature rise stage (750-950 ℃) of the high-temperature annealing, so that the mixed gas in the furnace has certain oxidizability, part of Alr is oxidized and converted into ineffective Al 2 O 3 Therefore, the method has the function of adjusting the actual content of Alr, so that the Alr content reaches the reasonable range required by the production of the oriented silicon steel, and the effects of stabilizing and improving the magnetic level of the oriented silicon steel are achieved.
Adjusting the dew point of the gas in the furnace in the temperature rise stage of 750-950 ℃ in high-temperature annealing to oxidize Alr to different degrees, so that the actual Alr content before secondary recrystallization of the steel reaches a reasonable range, and the purposes of stabilizing and improving the magnetic level of the product are achieved.
By detecting the average iron loss and the average magnetic polarization strength of the five-oriented silicon steel in the example and comparing the average iron loss and the average magnetic polarization strength with the five-oriented silicon steel produced by the five-oriented silicon steel in the comparative example in the conventional high-temperature annealing process (the other process conditions are the same as those in the example), the comparison results are shown in table 5, and the average magnetic polarization strength of the five-oriented silicon steel in the example is improved, and the average iron loss is reduced.
TABLE 5 Performance of example five vs. comparative example five
| Evaluation index | EXAMPLE five | Comparative example five |
| Average iron loss (P) 1.7/50 ,W/kg) | 1.01 | 1.30 |
| Average magnetic polarization intensity (J) 800 ,T) | 1.87 | 1.84 |
Claims (10)
1. The production process of the oriented silicon steel containing copper is characterized by comprising the following steps of:
s1: preparing a steel plate blank, wherein the steel plate blank comprises the following chemical components in percentage by weight, 0.02% -0.055% of C, si: 2.81-3.60% of Mn, 0.10-0.30% of Mn, 0.008-0.026% of Als, 0.4-0.6% of Cu, 0.006-0.012% of N, P: less than or equal to 0.050 percent and less than or equal to 0.015 percent of S; the balance of Fe and inevitable impurities;
s2: heating, hot rolling, pickling and first cold rolling the steel plate blank to obtain a first cold-rolled plate;
s3: performing decarburization treatment on the first cold-rolled sheet obtained in the step S2;
s4: carrying out secondary cold rolling on the cold-rolled sheet obtained in the step S3 to obtain a second cold-rolled sheet;
s5: coating an annealing isolation coating on the surface of the second cold-rolled plate obtained in the step S4 and coiling to obtain a steel coil;
s6: and (4) carrying out high-temperature annealing treatment on the steel coil obtained in the step (S5), and humidifying the introduced hydrogen and nitrogen mixed gas in the temperature rise stage of 750-950 ℃ of high-temperature annealing so as to control the dew point in the high-temperature annealing furnace to be-20-15 ℃.
2. The process for producing oriented silicon steel containing copper according to claim 1, wherein the Alr content in the steel slab is calculated by the formula: alr = Als- (27/14) × N.
3. The process for producing oriented silicon steel containing copper according to claim 1, wherein the first cold-rolled sheet has a thickness of 0.5mm to 0.7mm.
4. The process for producing oriented silicon steel containing copper of claim 1, wherein the second cold rolled sheet has a thickness of 0.22mm to 0.36mm.
5. The process for producing oriented silicon steel containing copper of claim 1, wherein the annealing separator coating comprises MgO, tiO 2 。
6. The process for producing oriented silicon steel containing copper of claim 5, wherein the moisture content of the annealing separator coating is 2% to 3.5%.
7. The process for producing oriented silicon steel containing copper according to claim 2, wherein when the Alr content is less than or equal to 0.00%, the dew point in the high-temperature annealing furnace is controlled to be-20 ℃ to-5 ℃.
8. The process for producing oriented silicon steel containing copper according to claim 2, wherein when the content of Alr is more than 0.00% and less than or equal to 0.0014%, the dew point in the high-temperature annealing furnace is controlled to be-10 ℃ to 5 ℃.
9. The process for producing oriented silicon steel containing copper as claimed in claim 2, wherein when the Alr content is 0.0015% to 0.0029%, the dew point in the high temperature annealing furnace is controlled to-5 ℃ to 10 ℃.
10. The process for producing oriented silicon steel containing copper according to claim 2, wherein the dew point in the high temperature annealing furnace is controlled to be 0 ℃ to 15 ℃ when the Alr content is not less than 0.0030%.
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| CN107849656A (en) * | 2015-07-08 | 2018-03-27 | 杰富意钢铁株式会社 | Orientation electromagnetic steel plate and its manufacture method |
| CN114150126A (en) * | 2021-12-02 | 2022-03-08 | 湖南华菱涟源钢铁有限公司 | Copper-containing general oriented silicon steel and preparation method thereof |
| CN115066508A (en) * | 2020-06-24 | 2022-09-16 | 日本制铁株式会社 | Method for producing grain-oriented electromagnetic steel sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107849656A (en) * | 2015-07-08 | 2018-03-27 | 杰富意钢铁株式会社 | Orientation electromagnetic steel plate and its manufacture method |
| CN115066508A (en) * | 2020-06-24 | 2022-09-16 | 日本制铁株式会社 | Method for producing grain-oriented electromagnetic steel sheet |
| CN114150126A (en) * | 2021-12-02 | 2022-03-08 | 湖南华菱涟源钢铁有限公司 | Copper-containing general oriented silicon steel and preparation method thereof |
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