CN116219135A - Preparation method of ultrathin high-magnetic-induction oriented silicon steel - Google Patents
Preparation method of ultrathin high-magnetic-induction oriented silicon steel Download PDFInfo
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- CN116219135A CN116219135A CN202310061150.2A CN202310061150A CN116219135A CN 116219135 A CN116219135 A CN 116219135A CN 202310061150 A CN202310061150 A CN 202310061150A CN 116219135 A CN116219135 A CN 116219135A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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Abstract
A preparation method of ultra-thin high magnetic induction oriented silicon steel relates to the technical field of oriented electrical steel production. The specific process comprises the technological processes of primary cold rolling, decarburization nitriding, secondary cold rolling, coating a release agent, high-temperature annealing, laser scoring and the like, and the obtained ultrathin high-magnetic induction oriented silicon steel comprises the following chemical components: c:0.020% -0.085%, si:2.80% -3.60%, als:0.010 to 0.020 percent, N:0.0080% -0.0100%, mn:0.030% -0.150%, S:0.0050% -0.0150% of trace auxiliary inhibitorThe sum of P+Cu+Sn+Bi+Sb+Cr is less than or equal to 1.70%, the balance is Fe and impurities, the thickness of the prepared product is less than or equal to 0.10mm, and the magnetic induction intensity B 8 More than or equal to 1.935T, iron loss P 17/50 ≤1.02W/kg。
Description
Technical Field
The invention relates to the technical field of oriented electrical steel production, in particular to a preparation method of ultrathin high-magnetic-induction oriented silicon steel.
Background
Cold rolled oriented silicon steel strip is an important raw material in the military industry and electronics industry, and is required to have good magnetic properties, including lower core loss and higher magnetic induction. Improvement of magnetic properties has been a problem that those skilled in the art have pursued in the study of oriented silicon steel. With the massive use of medium-high frequency transformers, pulse generators, choke coils for communication, inductance coils, storage and memory elements and the like, the demand for ultra-thin high magnetic induction oriented silicon steel with the thickness less than or equal to 0.10mm is increasing.
At present, the technology for preparing the oriented silicon steel is common, and the thickness of the product is about 0.23 mm. The technology for preparing the ultrathin high-magnetic induction oriented silicon steel with the thickness less than or equal to 0.10mm is limited. The application number is CN202010758881.9, the invention discloses a technical scheme for preparing high magnetic induction oriented silicon steel with the thickness of a finished product below 0.1mm in the 'preparation method of a high magnetic induction oriented silicon steel ultrathin strip'; specifically, 0.15-0.35 thick finished product oriented silicon steel is used as a raw material, and the production is carried out by adopting the technological process of first cold rolling, first high-temperature annealing, second cold rolling, second high-temperature annealing and domain refining.
The scheme adopts finished oriented silicon steel as a raw material for production and processing, the raw material cost is relatively high, and in addition, the cover annealing is adopted in the processing process, so that continuous production is not facilitated, and the production time period is relatively long.
The invention uses the common hot rolled coil as the raw material to manufacture and produce the ultrathin high magnetic induction oriented silicon steel, thereby remarkably reducing the production cost and slightly improving the magnetic induction intensity of the finished oriented silicon steel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adopts a hot rolled coil with low price as a raw material, limits the raw material components, selects the types and the quantity of inhibitors, adopts a specific continuous heating annealing furnace to carry out primary annealing, decarburization and nitridation, and carries out secondary rolling, secondary annealing and laser scoring, thereby obtaining the ideal ultrathin high-magnetic induction oriented silicon steel and effectively realizing the self aim.
The method of the invention is specifically described as follows:
the method takes a hot rolled coil plate with the thickness of 2.00mm as a raw material, and the prepared ultrathin high-magnetic-induction oriented silicon steel comprises the following chemical components in percentage by weight: c:0.020% -0.085%, si:2.80% -3.60%, als:0.010 to 0.020 percent, N:0.0080% -0.0100%, mn:0.030% -0.150%, S:0.0050% -0.0150%, the sum of trace auxiliary inhibitor P+Cu+Sn+Bi+Sb+Cr is less than or equal to 1.70%, and the balance is Fe and unavoidable impurities, so as to prepare the ultra-thin high magnetic induction oriented silicon steel with the thickness less than or equal to 0.10 mm.
According to the invention, P, cu, sn, bi, sb, cr and the like are taken as auxiliary inhibitors, because P, cu, sn, bi and the like belong to interface enrichment elements, enrichment is easy in phase boundaries and grain boundaries, thereby preventing growth of second phase and matrix grains and facilitating recrystallization of the Goos grains. However, when the content of elements such as P, cu, sn, bi is too high, edge cracking is likely to occur, so that the use amount of the trace auxiliary inhibitor is as follows: the sum of P+Cu+Sn+Bi+Sb+Cr is less than or equal to 1.70 percent.
In production, the ultrathin high-magnetic induction oriented silicon steel is prepared by primary cold rolling, annealing decarburization nitriding, secondary cold rolling, coating a release agent, high-temperature annealing, laser scoring and stretching flattening annealing, wherein:
1) Primary cold rolling: performing primary cold rolling on a hot rolled coil with the thickness of 2.0mm, wherein the total rolling reduction of the primary cold rolling is more than or equal to 90%; preparing primary cold-rolled strip steel with the thickness less than or equal to 0.20 mm;
2) Annealing decarburization nitriding: the primary cold-rolled strip steel is put into a continuous heating annealing furnace to carry out annealing decarburization and nitriding treatment, the annealing temperature is 750-850 ℃, the heat preservation time is 2-8 min, and the protective gas is N 2 And wet H 2 Mixed gas, N 2 And H is 2 The ratio of the N to the N is 1:2.5-3.5, and when the temperature is reduced to 500 ℃, N is introduced 2 Rapidly cooling to 45 ℃; decarburization nitriding is carried out, the final C is less than or equal to 30ppm, and the content of permeated nitrogen is 50-350 ppm;
3) Secondary cold rolling: performing secondary cold rolling on the primary cold-rolled strip steel subjected to annealing, decarburization and nitriding treatment, wherein the single-pass secondary reduction rate is 10-25%, and the final thickness of a finished product is controlled to be less than or equal to 0.1mm, so as to prepare secondary cold-rolled strip steel;
4) And (3) coating a release agent: coating MgO release agent on the surface of the secondary cold-rolled strip steel; the temperature of MgO solution is 4-10℃: single unit of isolating agent MgOThe coating weight of the surface is controlled to be 4-8 g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Drying and coiling;
5) High-temperature annealing: high-temperature annealing is carried out by adopting a secondary heat preservation mode, namely, the annealing temperature is between 800 and 1150 ℃ and the heat preservation is carried out for 5 to 10 hours and the annealing temperature is full H 2 Or N 2 And H is 2 Is carried out under the mixed gas of (2); n (N) 2 And H is 2 50-100% N by volume percentage in the mixed gas 2 And 50 to 0 percent of H 2 The method comprises the steps of carrying out a first treatment on the surface of the When the annealing temperature is increased to 1150-1230 ℃, the temperature is kept for 5-20 hours and the annealing is performed in full H 2 The process is carried out under atmosphere; wherein, when the annealing temperature is raised from 800 ℃ to 1230 ℃, the heating speed is controlled to be 20-60 ℃/h;
6) Laser scoring: by CO 2 The gas laser has laser power of 5-30 kw, groove depth of 0.6-2.5 mu m, groove width of 20-30 mu m, scanning speed of 450-750mm/s and strip steel linear speed of 40-50 m/min.
7) Stretching, leveling and annealing: and (5) finishing stretching and leveling annealing and coating an insulating coating, so as to obtain the ultrathin high-magnetic induction oriented silicon steel.
Further, decarburization nitriding is completed in a heating annealing furnace in the preparation process of the ultrathin high-magnetic induction oriented silicon steel.
Further, the thickness of the ultrathin high-magnetic induction oriented silicon steel is below 0.10mm, and the magnetic induction intensity B of the ultrathin high-magnetic induction oriented silicon steel 8 More than or equal to 1.935T, iron loss P 17/50 ≤1.02W/kg。
The beneficial effects of the invention are as follows:
1) According to the invention, the hot rolled coiled plate is used as a raw material, so that the production cost is greatly reduced, and meanwhile, the continuous heating annealing furnace is used for replacing the hood-type annealing furnace, so that the annealing decarburization and the nitriding are sequentially carried out in the same heating annealing furnace, and the actual production process flow is greatly reduced.
2) The laser scoring depth adopted by the invention is 0.6-2.5 mu m, the bottom layer of the oriented silicon steel magnesium silicate is not damaged, and the damage to the insulating coating is very small;
3) The thickness of the produced ultrathin oriented silicon steel product is less than 0.10mm, the thinness of the oriented silicon steel product is further improved, and meanwhile, the magnetic induction strength and the iron loss rate of the oriented silicon steel product are guaranteed, so that the ultrathin oriented silicon steel product has a wide market application prospect.
Detailed Description
The invention will now be further illustrated by means of specific examples.
Example 1
Taking a hot rolled coiled plate with the thickness of 2.00mm as a raw material to prepare the ultrathin high-magnetic-induction oriented silicon steel with the thickness of 0.10mm, wherein the chemical components of the ultrathin high-magnetic-induction oriented silicon steel are as follows in percentage by weight: c:0.055%, si:3.00%, als:0.016%, N:0.0089%, mn:0.110%, S:0.008, a trace auxiliary inhibitor P+Cu+Sn+Bi+Sb+Cr, the sum of which is 1.70%, and the balance of Fe and unavoidable impurities,
in production, the ultrathin high-magnetic induction oriented silicon steel is prepared by primary cold rolling, annealing decarburization nitriding, secondary cold rolling, coating a release agent, high-temperature annealing, laser scoring and stretching flattening annealing, wherein:
1) Secondary cold rolling: performing primary cold rolling on a hot rolled coil with the thickness of 2.0mm, wherein the total rolling reduction of the primary cold rolling reaches 90%; preparing primary cold-rolled strip steel with the thickness of 0.20 mm;
2) Annealing decarburization nitriding: annealing, decarburizing and nitriding the primary cold-rolled strip steel with the thickness of 0.20mm in the same continuous heating annealing furnace, wherein the annealing temperature is 835 ℃, the heat preservation time is 5min, and the protective gas is N 2 And wet H 2 Mixed gas, N 2 And H is 2 The ratio of the N to the N is 1:2.9, and when the temperature is reduced to 500 ℃, N is introduced 2 Rapidly cooling to 45 ℃; after decarburization nitriding is completed, the final C content is 20ppm, and the infiltration nitrogen content is 250ppm;
3) Secondary cold rolling: performing secondary cold rolling on the primary cold-rolled strip steel subjected to annealing, decarburization and nitriding treatment, and controlling the final thickness of a finished product to be 0.1mm to prepare secondary cold-rolled strip steel;
4) And (3) coating a release agent: coating MgO release agent on the surface of the secondary cold-rolled strip steel; mgO solution temperature is 5℃: the single-side coating amount of the parting agent MgO is controlled to be 6g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Drying and coiling;
5) High-temperature annealing: high-temperature annealing is carried out by adopting a secondary heat preservation mode, namely the annealing temperature is 900 ℃, the heat preservation is carried out for 7 hours, and the annealing is carried out in all H 2 Under the gas; when the annealing temperature is raised to 1180 ℃, the temperature is kept for 15 hours at the temperature, and the annealing temperature is kept at full H 2 The process is carried out under atmosphere; wherein, when the annealing temperature is raised from 800 ℃ to 1180 ℃, the heating speed is controlled at 40 ℃/h;
6) Laser scoring: by CO 2 The gas laser has the laser power of 25kw, the groove depth of 2.0 mu m, the groove width of 30 mu m, the scanning speed of 500mm/s and the strip steel linear speed of 40m/min;
7) Stretching, leveling and annealing: and (5) finishing stretching and leveling annealing and coating an insulating coating, so as to obtain the ultrathin high-magnetic induction oriented silicon steel.
The thickness of the prepared ultrathin high-magnetic-induction oriented silicon steel is 0.10mm, and the magnetic induction intensity B thereof 8＝ 1.95T, iron loss P 17/50 ＝1.00W/kg。
Example 2
Taking a hot rolled coiled plate with the thickness of 2.00mm as a raw material to prepare the ultrathin high-magnetic-induction oriented silicon steel with the thickness of 0.09mm, wherein the ultrathin high-magnetic-induction oriented silicon steel comprises the following chemical components in percentage by weight: c:0.065%, si:
3.20%, als:0.015%, N:0.0079%, mn:0.09%, S:0.012, a trace auxiliary inhibitor P+Cu+Sn+Bi+Sb+Cr, the sum of which is 1.69%, and the balance of Fe and unavoidable impurities,
in production, the ultrathin high-magnetic induction oriented silicon steel is prepared by primary cold rolling, annealing decarburization nitriding, secondary cold rolling, coating a release agent, high-temperature annealing, laser scoring and stretching flattening annealing, wherein:
1) Primary cold rolling: performing primary cold rolling on a hot rolled coil with the thickness of 2.0mm, wherein the total rolling reduction of the primary cold rolling reaches 90%; preparing primary cold-rolled strip steel with the thickness of 0.20 mm;
2) Annealing decarburization nitriding: annealing, decarburizing and nitriding the primary cold-rolled strip steel with the thickness of 0.20mm in the same continuous heating furnace annealing furnace, wherein the annealing temperature is 830 ℃, the heat preservation time is 7min, and the protective gas is N 2 And wet H 2 Mixed gas, N 2 And H is 2 The ratio of the N to the N is 1:2.5, and when the temperature is reduced to 500 ℃, N is introduced 2 Rapidly cooling to 45 ℃; the final C content after decarburization nitriding was 250ppm,the content of permeated nitrogen is 200ppm;
3) Secondary cold rolling: performing secondary cold rolling on the primary cold-rolled strip steel subjected to annealing, decarburization and nitriding treatment, and controlling the final thickness of a finished product to be 0.09mm to prepare secondary cold-rolled strip steel;
4) And (3) coating a release agent: coating MgO release agent on the surface of the secondary cold-rolled strip steel; mgO solution temperature is 6℃: the single-sided coating amount of the parting agent MgO is controlled to be 5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Drying and coiling;
5) High-temperature annealing: high-temperature annealing is carried out by adopting a secondary heat preservation mode, namely, the annealing temperature is 890 ℃, the heat preservation is carried out for 10 hours, and N is 2 And H is 2 Is carried out under the mixed gas of (2); n (N) 2 And H is 2 The mixed gas contains 75% N by volume 2 With 25% H 2 The method comprises the steps of carrying out a first treatment on the surface of the When the annealing temperature is raised to 1200 ℃, the annealing is carried out for 15 hours at the temperature, and the annealing is carried out at the full H 2 The process is carried out under atmosphere; wherein, when the annealing temperature is increased from 800 ℃ to 1200 ℃, the heating speed is controlled to be 60 ℃/h;
6) Laser scoring: by CO 2 The gas laser has the laser power of 20kw, the groove depth of 1.5 mu m, the groove width of 20 mu m, the scanning speed of 550mm/s and the strip steel linear speed of 40m/min;
7) Stretching, leveling and annealing: and (5) finishing stretching and leveling annealing and coating an insulating coating, so as to obtain the ultrathin high-magnetic induction oriented silicon steel.
The thickness of the finally obtained ultrathin high-magnetic-induction oriented silicon steel is 0.09mm, and the magnetic induction intensity B thereof 8＝ 1.96T, core loss P 17/50 ≤0.98W/kg。
Claims (2)
1. The preparation method of the ultrathin high-magnetic-induction oriented silicon steel is characterized in that a hot rolled coiled plate with the thickness of 2.00mm is used as a raw material, and the prepared ultrathin high-magnetic-induction oriented silicon steel comprises the following chemical components in percentage by weight: c:0.020% -0.085%, si:2.80% -3.60%, als:0.010 to 0.020 percent, N:0.0080% -0.0100%, mn:0.030% -0.150%, S:0.0050% -0.0150%, the sum of trace auxiliary inhibitor P+Cu+Sn+Bi+Sb+Cr is less than or equal to 1.70%, and the balance is Fe and unavoidable impurities, so as to prepare the ultra-thin high-magnetic induction oriented silicon steel with the thickness less than or equal to 0.10 mm;
in production, the ultrathin high-magnetic induction oriented silicon steel is prepared by primary cold rolling, annealing decarburization nitriding, secondary cold rolling, coating a release agent, high-temperature annealing, laser scoring and stretching flattening annealing, wherein:
1) Primary cold rolling: performing primary cold rolling on a hot rolled coil with the thickness of 2.0mm, wherein the total rolling reduction of the primary cold rolling is more than or equal to 90%; preparing primary cold-rolled strip steel with the thickness less than or equal to 0.20 mm;
2) Annealing decarburization nitriding: the primary cold-rolled strip steel is put into a continuous heating annealing furnace to carry out annealing decarburization and nitriding treatment, the annealing temperature is 750-850 ℃, the heat preservation time is 2-8 min, and the protective gas is N 2 And wet H 2 Mixed gas, N 2 And H is 2 The ratio of the N to the N is 1:2.5-3.5, and when the temperature is reduced to 500 ℃, N is introduced 2 Rapidly cooling to 45 ℃; decarburization nitriding is carried out, the final C is less than or equal to 30ppm, and the content of permeated nitrogen is 50-350 ppm;
3) Secondary cold rolling: performing secondary cold rolling on the primary cold-rolled strip steel subjected to annealing, decarburization and nitriding treatment, wherein the single-pass secondary reduction rate is 10-25%, and the final thickness of a finished product is controlled to be less than or equal to 0.1mm, so as to prepare secondary cold-rolled strip steel;
4) And (3) coating a release agent: coating MgO release agent on the surface of the secondary cold-rolled strip steel; the temperature of MgO solution is 4-10℃: the single-side coating amount of the parting agent MgO is controlled to be 4-8 g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Drying and coiling;
5) High-temperature annealing: high-temperature annealing is carried out by adopting a secondary heat preservation mode, namely, the annealing temperature is between 800 and 1150 ℃ and the heat preservation is carried out for 5 to 10 hours and the annealing temperature is full H 2 Or N 2 And H is 2 Is carried out under the mixed gas of (2); n (N) 2 And H is 2 50-100% N by volume percentage in the mixed gas 2 With 0 to 50 percent of H 2 The method comprises the steps of carrying out a first treatment on the surface of the When the annealing temperature is increased to 1150-1230 ℃, the temperature is kept for 5-20 hours and the annealing is performed in full H 2 The process is carried out under atmosphere; wherein, when the annealing temperature is raised from 800 ℃ to 1230 ℃, the heating speed is controlled to be 20-60 ℃/h;
6) Laser scoring: by CO 2 The gas laser has laser power of 5-30 kw, groove depth of 0.6-2.5 mu m, groove width of 20-30 mu m and scanning speed of 450-7The linear speed of the strip steel is 50mm/s and 40-50 m/min.
7) Stretching, leveling and annealing: and (5) finishing stretching and leveling annealing and coating an insulating coating, so as to obtain the ultrathin high-magnetic induction oriented silicon steel.
2. The ultra-thin high magnetic induction oriented silicon steel according to claim 1, wherein the magnetic induction intensity B of the ultra-thin high magnetic induction oriented silicon steel 8 More than or equal to 1.935T, iron loss P 17/50 ≤1.02W/kg。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116752041A (en) * | 2023-06-20 | 2023-09-15 | 武汉钢铁有限公司 | Preparation method of high-magnetic-induction oriented silicon steel ultrathin strip |
| CN116804255A (en) * | 2023-06-20 | 2023-09-26 | 武汉钢铁有限公司 | Preparation method of high-magnetic-induction oriented silicon steel ultrathin strip with excellent adhesion |
| CN117737375A (en) * | 2024-02-08 | 2024-03-22 | 内蒙古矽能电磁科技有限公司 | Thin-specification oriented silicon steel and preparation method and application thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116752041A (en) * | 2023-06-20 | 2023-09-15 | 武汉钢铁有限公司 | Preparation method of high-magnetic-induction oriented silicon steel ultrathin strip |
| CN116804255A (en) * | 2023-06-20 | 2023-09-26 | 武汉钢铁有限公司 | Preparation method of high-magnetic-induction oriented silicon steel ultrathin strip with excellent adhesion |
| CN117737375A (en) * | 2024-02-08 | 2024-03-22 | 内蒙古矽能电磁科技有限公司 | Thin-specification oriented silicon steel and preparation method and application thereof |
| CN117737375B (en) * | 2024-02-08 | 2024-05-03 | 内蒙古矽能电磁科技有限公司 | Thin-specification oriented silicon steel and preparation method and application thereof |
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