CN110551886A - Oriented silicon steel annealing process - Google Patents
Oriented silicon steel annealing process Download PDFInfo
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- CN110551886A CN110551886A CN201910725189.3A CN201910725189A CN110551886A CN 110551886 A CN110551886 A CN 110551886A CN 201910725189 A CN201910725189 A CN 201910725189A CN 110551886 A CN110551886 A CN 110551886A
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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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
-
- 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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1266—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest between cold rolling steps
Abstract
The invention relates to an oriented silicon steel annealing process, which belongs to the technical field of oriented silicon steel production and manufacture; providing an oriented silicon steel annealing process for reducing iron loss and improving magnetic induction; the technical scheme is as follows: an oriented silicon steel annealing process, comprising the steps of: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the invention is specially used in the field of oriented silicon steel smelting and manufacturing production.
Description
Technical Field
The invention discloses an oriented silicon steel annealing process, and belongs to the technical field of oriented silicon steel production and manufacturing.
Background
oriented silicon steel is a ferrosilicon alloy with preferred grain orientation produced by deformation and recrystallization annealing, and has a silicon content of about 3% and a very low carbon content. The product was a cold rolled sheet or strip with nominal thicknesses of 0.18, 0.23, 0.28, 0.30 and 0.35 mm. The soft magnetic material is mainly used for manufacturing various transformers, fluorescent lamp ballasts and stator cores of steam turbine generators. When the oriented silicon steel is magnetized as a magnetic medium in an alternating current working environment, a part of energy is converted into heat in an electromagnetic conversion process and is lost, and the lost energy is called iron loss. The iron loss comprises hysteresis loss and eddy current loss, and the hysteresis loss refers to inherent loss generated by a ferromagnetic material serving as a magnetic medium under a certain excitation magnetic field; the eddy current loss refers to the loss generated by the core resistance due to the induced current generated by the core when the magnetic flux alternates.
The oriented silicon steel has the difficult problems of reducing iron loss and improving magnetic induction, and the existing oriented silicon steel production process is basically as follows:
demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; how to stably reduce the iron loss on the basis of the prior art is not available for visual literature and data. The market puts forward higher requirements on the performance of the oriented silicon steel, and the inevitable trend of producing and manufacturing the transformer is energy conservation, consumption reduction and cost reduction.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides the annealing process of the oriented silicon steel, which reduces the iron loss and improves the magnetic induction.
in order to solve the technical problems, the invention adopts the technical scheme that: an oriented silicon steel annealing process, comprising the steps of: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the method specifically comprises the following steps:
1) demanganizing the molten iron, detecting the manganese content in the molten iron of the blast furnace, adding iron scale into the torpedo tank according to the manganese content to carry out a preheating process, wherein the time of the preheating process is controlled to be 2-3 hours, and when demanganizing the molten iron, introducing the high-temperature molten iron discharged from the blast furnace into the torpedo tank; fully mixing the high-temperature molten iron with the preheated iron scale and carrying out an oxidation reduction reaction;
2) smelting, namely filling the demanganized molten iron into an electric furnace, mixing smelting raw materials into furnace burden, continuously filling the furnace burden into the electric furnace from a high-level stock bin along a material pipe, and starting smelting after the furnace burden is full;
3) Performing vacuum treatment, namely, converting the molten iron obtained in the second step into a vacuum container, and discharging gas dissolved in the molten iron as much as possible to improve the quality of steel;
4) Die casting, namely casting the molten iron obtained in the third step into a blooming plate blank through a tundish, and using the blooming plate blank after cooling;
5) hot continuous rolling, wherein the fourth primary rolled plate blank is subjected to rough rolling, end cutting, finish rolling and finishing in sequence to form a strip steel coiled material;
6) acid washing, wherein the strip steel coiled material is subjected to acid washing to remove an oxide layer on the surface of the strip steel;
7) carrying out primary cold rolling, namely rolling the steel strip to the thickness of a finished product of 0.50-0.80 mm;
8) decarburization annealing, wherein the decarburization annealing is carried out on the steel strip after the primary cold rolling in the seventh step;
9) Performing aging annealing at 300-500 ℃, and performing failure annealing on the decarburized and annealed steel strip in the eighth step at 300-500 ℃ in a nitrogen protective atmosphere;
10) Secondary cold rolling, and secondary cold rolling the steel strip to the final thickness of the product after aging annealing at 300-500 ℃;
11) coating MgO, coating MgO isolating agent on a secondary cold-rolled hard coil, and drying;
12) performing high-temperature annealing, namely performing high-temperature annealing on the steel coil obtained in the eleventh step through a CB (coil bonding) line;
13) and carrying out flattening, stretching and annealing and coating an insulating film, wherein the steel coil is subjected to flattening, stretching and annealing and coating the insulating film after high-temperature annealing.
And (3) preserving the heat of the aging annealing at the temperature of 300-500 ℃ for 2-4 h.
the furnace burden comprises: apatite, coke, silica, iron filings, and the apatite, coke, silica, iron filings are in accordance with 100: 16: 26: 42, respectively.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, aging annealing at 300-500 ℃ is adopted, so that fine carbides can be effectively precipitated, and the precipitation of inhibitors in steel is enhanced. The tracking of finished products of the oriented silicon steel subjected to the aging annealing treatment and the non-aging treated oriented silicon steel shows that the iron loss of the finished product of the aging annealing oriented silicon steel coil at 300-500 ℃ is reduced by 0.03W/Kg.
Detailed Description
example 1
An oriented silicon steel annealing process, comprising the steps of: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the method specifically comprises the following steps:
1) demanganizing the molten iron, detecting the manganese content in the molten iron of the blast furnace, adding iron scale into the torpedo tank according to the manganese content to carry out a preheating process, wherein the time of the preheating process is controlled to be 2-3 hours, and when demanganizing the molten iron, introducing the high-temperature molten iron discharged from the blast furnace into the torpedo tank; fully mixing the high-temperature molten iron with the preheated iron scale and carrying out an oxidation reduction reaction;
2) smelting, namely filling the demanganized molten iron into an electric furnace, mixing smelting raw materials into furnace burden, continuously filling the furnace burden into the electric furnace from a high-level stock bin along a material pipe, and starting smelting after the furnace burden is full;
3) performing vacuum treatment, namely, converting the molten iron obtained in the second step into a vacuum container, and discharging gas dissolved in the molten iron as much as possible to improve the quality of steel;
4) Die casting, namely casting the molten iron obtained in the third step into a blooming plate blank through a tundish, and using the blooming plate blank after cooling;
5) hot continuous rolling, wherein the fourth primary rolled plate blank is subjected to rough rolling, end cutting, finish rolling and finishing in sequence to form a strip steel coiled material;
6) Acid washing, wherein the strip steel coiled material is subjected to acid washing to remove an oxide layer on the surface of the strip steel;
7) Carrying out primary cold rolling, namely rolling the steel strip to the thickness of a finished product of 0.50-0.80 mm;
8) decarburization annealing, wherein the decarburization annealing is carried out on the steel strip after the primary cold rolling in the seventh step;
9) performing aging annealing at 300-500 ℃, and performing failure annealing on the decarburized and annealed steel strip in the eighth step at 300 ℃ in a nitrogen protective atmosphere;
10) Secondary cold rolling, and secondary cold rolling the steel strip to the final thickness of the product after aging annealing at 300-500 ℃;
11) Coating MgO, coating MgO isolating agent on a secondary cold-rolled hard coil, and drying;
12) performing high-temperature annealing, namely performing high-temperature annealing on the steel coil obtained in the eleventh step through a CB (coil bonding) line;
13) And carrying out flattening, stretching and annealing and coating an insulating film, wherein the steel coil is subjected to flattening, stretching and annealing and coating the insulating film after high-temperature annealing.
And (3) preserving the heat of the aging annealing at the temperature of 300-500 ℃ for 2-4 h.
the furnace burden comprises: apatite, coke, silica, iron filings, and the apatite, coke, silica, iron filings are in accordance with 100: 16: 26: 42, respectively.
Example 2
An oriented silicon steel annealing process, comprising the steps of: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the method specifically comprises the following steps:
1) Demanganizing the molten iron, detecting the manganese content in the molten iron of the blast furnace, adding iron scale into the torpedo tank according to the manganese content to carry out a preheating process, wherein the time of the preheating process is controlled to be 2-3 hours, and when demanganizing the molten iron, introducing the high-temperature molten iron discharged from the blast furnace into the torpedo tank; fully mixing the high-temperature molten iron with the preheated iron scale and carrying out an oxidation reduction reaction;
2) smelting, namely filling the demanganized molten iron into an electric furnace, mixing smelting raw materials into furnace burden, continuously filling the furnace burden into the electric furnace from a high-level stock bin along a material pipe, and starting smelting after the furnace burden is full;
3) performing vacuum treatment, namely, converting the molten iron obtained in the second step into a vacuum container, and discharging gas dissolved in the molten iron as much as possible to improve the quality of steel;
4) die casting, namely casting the molten iron obtained in the third step into a blooming plate blank through a tundish, and using the blooming plate blank after cooling;
5) Hot continuous rolling, wherein the fourth primary rolled plate blank is subjected to rough rolling, end cutting, finish rolling and finishing in sequence to form a strip steel coiled material;
6) acid washing, wherein the strip steel coiled material is subjected to acid washing to remove an oxide layer on the surface of the strip steel;
7) carrying out primary cold rolling, namely rolling the steel strip to the thickness of a finished product of 0.50-0.80 mm;
8) Decarburization annealing, wherein the decarburization annealing is carried out on the steel strip after the primary cold rolling in the seventh step;
9) Performing aging annealing at 300-500 ℃, and performing failure annealing on the decarburized and annealed steel strip in the eighth step at 400 ℃ in a nitrogen protective atmosphere;
10) secondary cold rolling, and secondary cold rolling the steel strip to the final thickness of the product after aging annealing at 300-500 ℃;
11) coating MgO, coating MgO isolating agent on a secondary cold-rolled hard coil, and drying;
12) Performing high-temperature annealing, namely performing high-temperature annealing on the steel coil obtained in the eleventh step through a CB (coil bonding) line;
13) and carrying out flattening, stretching and annealing and coating an insulating film, wherein the steel coil is subjected to flattening, stretching and annealing and coating the insulating film after high-temperature annealing.
and (3) preserving the heat of the aging annealing at the temperature of 300-500 ℃ for 2-4 h.
The furnace burden comprises: apatite, coke, silica, iron filings, and the apatite, coke, silica, iron filings are in accordance with 100: 16: 26: 42, respectively.
example 3
An oriented silicon steel annealing process, comprising the steps of: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the method specifically comprises the following steps:
1) demanganizing the molten iron, detecting the manganese content in the molten iron of the blast furnace, adding iron scale into the torpedo tank according to the manganese content to carry out a preheating process, wherein the time of the preheating process is controlled to be 2-3 hours, and when demanganizing the molten iron, introducing the high-temperature molten iron discharged from the blast furnace into the torpedo tank; fully mixing the high-temperature molten iron with the preheated iron scale and carrying out an oxidation reduction reaction;
2) Smelting, namely filling the demanganized molten iron into an electric furnace, mixing smelting raw materials into furnace burden, continuously filling the furnace burden into the electric furnace from a high-level stock bin along a material pipe, and starting smelting after the furnace burden is full;
3) Performing vacuum treatment, namely, converting the molten iron obtained in the second step into a vacuum container, and discharging gas dissolved in the molten iron as much as possible to improve the quality of steel;
4) die casting, namely casting the molten iron obtained in the third step into a blooming plate blank through a tundish, and using the blooming plate blank after cooling;
5) hot continuous rolling, wherein the fourth primary rolled plate blank is subjected to rough rolling, end cutting, finish rolling and finishing in sequence to form a strip steel coiled material;
6) acid washing, wherein the strip steel coiled material is subjected to acid washing to remove an oxide layer on the surface of the strip steel;
7) carrying out primary cold rolling, namely rolling the steel strip to the thickness of a finished product of 0.50-0.80 mm;
8) decarburization annealing, wherein the decarburization annealing is carried out on the steel strip after the primary cold rolling in the seventh step;
9) performing aging annealing at 300-500 ℃, and performing failure annealing on the decarburized and annealed steel strip in the eighth step at 500 ℃ in a nitrogen protective atmosphere;
10) secondary cold rolling, and secondary cold rolling the steel strip to the final thickness of the product after aging annealing at 300-500 ℃;
11) coating MgO, coating MgO isolating agent on a secondary cold-rolled hard coil, and drying;
12) Performing high-temperature annealing, namely performing high-temperature annealing on the steel coil obtained in the eleventh step through a CB (coil bonding) line;
13) and carrying out flattening, stretching and annealing and coating an insulating film, wherein the steel coil is subjected to flattening, stretching and annealing and coating the insulating film after high-temperature annealing.
And (3) preserving the heat of the aging annealing at the temperature of 300-500 ℃ for 2-4 h.
the furnace burden comprises: apatite, coke, silica, iron filings, and the apatite, coke, silica, iron filings are in accordance with 100: 16: 26: 42, respectively.
The present invention is described in detail with reference to the above embodiments, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.
Claims (3)
1. an oriented silicon steel annealing process is characterized in that: the method comprises the following steps: demanganizing molten iron → smelting → vacuum processing → die casting → cogging → hot continuous rolling → acid washing → primary cold rolling → decarburization annealing → aging annealing at 300 ℃ -500 ℃, secondary cold rolling → coating of MgO → high temperature annealing → leveling stretching annealing and coating of insulating film; the method specifically comprises the following steps:
1) demanganizing the molten iron, detecting the manganese content in the molten iron of the blast furnace, adding iron scale into the torpedo tank according to the manganese content to carry out a preheating process, wherein the time of the preheating process is controlled to be 2-3 hours, and when demanganizing the molten iron, introducing the high-temperature molten iron discharged from the blast furnace into the torpedo tank; fully mixing the high-temperature molten iron with the preheated iron scale and carrying out an oxidation reduction reaction;
2) smelting, namely filling the demanganized molten iron into an electric furnace, mixing smelting raw materials into furnace burden, continuously filling the furnace burden into the electric furnace from a high-level stock bin along a material pipe, and starting smelting after the furnace burden is full;
3) Performing vacuum treatment, namely, converting the molten iron obtained in the second step into a vacuum container, and discharging gas dissolved in the molten iron as much as possible to improve the quality of steel;
4) Die casting, namely casting the molten iron obtained in the third step into a blooming plate blank through a tundish, and using the blooming plate blank after cooling;
5) hot continuous rolling, wherein the fourth primary rolled plate blank is subjected to rough rolling, end cutting, finish rolling and finishing in sequence to form a strip steel coiled material;
6) acid washing, wherein the strip steel coiled material is subjected to acid washing to remove an oxide layer on the surface of the strip steel;
7) Carrying out primary cold rolling, namely rolling the steel strip to the thickness of a finished product of 0.50-0.80 mm;
8) decarburization annealing, wherein the decarburization annealing is carried out on the steel strip after the primary cold rolling in the seventh step;
9) performing aging annealing at 300-500 ℃, and performing failure annealing on the decarburized and annealed steel strip in the eighth step at 300-500 ℃ in a nitrogen protective atmosphere;
10) secondary cold rolling, and secondary cold rolling the steel strip to the final thickness of the product after aging annealing at 300-500 ℃;
11) coating MgO, coating MgO isolating agent on a secondary cold-rolled hard coil, and drying;
12) Performing high-temperature annealing, namely performing high-temperature annealing on the steel coil obtained in the eleventh step through a CB (coil bonding) line;
13) and carrying out flattening, stretching and annealing and coating an insulating film, wherein the steel coil is subjected to flattening, stretching and annealing and coating the insulating film after high-temperature annealing.
2. the oriented silicon steel annealing process of claim 1, wherein: and (3) preserving the heat of the aging annealing at the temperature of 300-500 ℃ for 2-4 h.
3. the oriented silicon steel annealing process of claim 1, wherein: the furnace burden comprises: apatite, coke, silica, iron filings, and the apatite, coke, silica, iron filings are in accordance with 100: 16: 26: 42, respectively.
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| CN201910725189.3A CN110551886A (en) | 2019-08-07 | 2019-08-07 | Oriented silicon steel annealing process |
| PCT/CN2020/107539 WO2021023279A1 (en) | 2019-08-07 | 2020-08-06 | Oriented silicon steel annealing process |
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| WO2021023279A1 (en) * | 2019-08-07 | 2021-02-11 | 包头威丰新材料有限公司 | Oriented silicon steel annealing process |
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| CN114107619A (en) * | 2021-10-09 | 2022-03-01 | 山东那美新材料科技有限公司 | Production method of silicon steel ultra-thin strip with high magnetic induction and low iron loss |
| CN114292996B (en) * | 2021-11-26 | 2023-12-08 | 铃木加普腾钢丝（苏州）有限公司 | Process for heat treating steel wire oxide layer |
| CN114883578B (en) * | 2022-05-09 | 2023-02-10 | 浙江天能汽车电池有限公司 | Preparation method of storage battery pole plate |
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Application publication date: 20191210 |
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