CN112593053A - Oriented silicon steel high-temperature annealing process with low gas consumption optimization cost - Google Patents
Oriented silicon steel high-temperature annealing process with low gas consumption optimization cost Download PDFInfo
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- CN112593053A CN112593053A CN202011472336.XA CN202011472336A CN112593053A CN 112593053 A CN112593053 A CN 112593053A CN 202011472336 A CN202011472336 A CN 202011472336A CN 112593053 A CN112593053 A CN 112593053A
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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
- 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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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/08—Extraction of nitrogen
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The invention relates to the technical field of oriented silicon steel, and discloses an oriented silicon steel high-temperature annealing process with low gas consumption optimization cost, which comprises the following steps: s1, cleaning a furnace platform by using high-pressure air before charging the casting blank into a furnace and charging the casting blank into the furnace, blowing dust or other impurities in a vent pipe clean, selecting a material tray and a material basket matched with the steel coil according to the coil diameter of the steel coil, and putting the casting blank into the furnace; and S2, completely sealing the furnace platform filled with the casting blank by furnace platform sealing. According to the oriented silicon steel high-temperature annealing process with low gas consumption optimization cost, ammonia decomposition gas is used in a high-temperature insulation stage, the ammonia decomposition gas is relatively stable relative to hydrogen, the production cost is lower than that of the hydrogen, the cost is greatly reduced, the energy consumption is saved, primary recrystallization grains are formed in a low-temperature insulation stage in order to eliminate stress, decarburization is carried out, secondary recrystallization is carried out in the high-temperature insulation stage, steel quality is purified, a sintered magnesium silicate bottom layer is formed, and finally, after the annealing is completed, the sintering of an insulating coating and the hot stretching leveling are completed.
Description
Technical Field
The invention relates to the technical field of oriented silicon steel, in particular to an oriented silicon steel high-temperature annealing process with low gas consumption optimization cost.
Background
The oriented silicon steel is mainly used for manufacturing transformer cores and stator cores of large generators, is an indispensable important soft magnetic alloy in the power and military industries, and needs to be annealed at high temperature to be recrystallized for the second time when being manufactured, and when being annealed at high temperature, the steel sheet is heated to about 950 ℃ to start recrystallization, so that the steel sheet can obtain proper grain size, the orientation degree is improved, the purpose of improving magnetism is achieved, the silicon steel forms a magnesium silicate bottom layer, a silicon-rich film of silicon dioxide is formed on the surface of the steel sheet after final decarburization and annealing, the silicon-rich film reacts with magnesium oxide when being heated to about 1050 ℃, a glassy magnesium silicate bottom layer is formed on the surface of strip steel to improve the insulating property and the adhesive force of an insulating coating of the oriented silicon steel, impurities can be eliminated, the steel core is purified, crystal grains grow up, the oriented degree is improved and then decomposed along with the further rise of the temperature, in the high-temperature soaking process, the impurities are removed, so that the steel quality is purified, and the magnetism is improved. . Manganese sulfide (MnS), aluminum nitride (AIN) and the like in the oriented silicon steel are favorably mixed, and secondary recrystallization is promoted to form crystals.
Because carbon exists in the silicon steel as interstitial atoms or carbides, decarburization is needed when the oriented silicon steel is added, in the existing high-temperature annealing process of the oriented silicon steel, a hot rolled plate structure is refined to form small recrystallized grains, but before the high-temperature annealing process, if the content of residual carbon in steel is too high, austenite formed in the high-temperature annealing process of a steel plate can hinder the growth of ferrite grains in secondary recrystallization, so that the size of secondary grains is reduced, the magnetic performance of a finished product is influenced, the existing high-temperature annealing process of the oriented silicon steel cannot effectively shorten the preparation time, and the preparation cost is still high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the oriented silicon steel high-temperature annealing process with lower gas consumption optimization cost, which has the advantages of enhancing the magnetic property of a finished product, saving energy consumption and reducing cost, and solves the problems in the background technology.
The invention provides the following technical scheme: a high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost comprises the following steps:
s1, charging the casting blank into a furnace
Cleaning a furnace platform by using high-pressure air before charging, sweeping dust or other impurities in a vent pipe, selecting a material tray and a material basket matched with the steel coil according to the coil diameter of the steel coil, and putting a casting blank into the furnace;
s2, sealing the furnace platform
Completely sealing the furnace platform filled with the casting blank, heating the interior of the furnace platform by using a natural gas heating or electric heating mode, and electrically heating the furnace platform;
s3, heating and raising the temperature
Introducing nitrogen into the furnace before heating, evacuating air in the furnace and then heating by using natural gas;
s4, low-temperature-keeping stage
Heating the furnace body to 550 +/-20 ℃ under the nitrogen protection atmosphere, protecting the furnace body by using ammonia decomposition gas after the temperature is raised to 550 +/-20 ℃, and then heating to 600 ℃ under the same atmosphere and preserving the temperature;
s5, high heat preservation stage
After the low-temperature insulation is finished, the temperature is raised to 1150 ℃, ammonia decomposition gas is used for protection, secondary recrystallization is carried out in the process, and the silicon steel in the furnace is purified, namely, the nitrogen and the sulfur in the silicon steel are removed.
S6, cooling stage
After the high heat preservation is finished, cooling by using ammonia decomposition gas protection, cooling to below 1000 ℃, replacing nitrogen gas, cooling to 500 ℃, and discharging.
Preferably, the ratio of the nitrogen to the ammonia decomposition gas in the step S4 is 1: 1.
Preferably, in the step S4, the water of hydration in the magnesium oxide should be removed, and the dew point of the atmosphere is controlled below 0 ℃.
Preferably, the ratio of ammonia decomposition gas to nitrogen gas in the step of S5 is 3: 2.
Preferably, the ammonia decomposition gas at the temperature of S5 is less than-15 ℃ when the temperature reaches 1000 ℃ to form a bottom layer, and the ammonia decomposition gas at the temperature of less than-60 ℃ is replaced when the temperature is increased to 1200 ℃.
Preferably, the high temperature annealing is followed by a leveling stretch annealing and an insulating film coating.
Compared with the prior art, the invention has the following beneficial effects:
the high-temperature annealing process for the oriented silicon steel with optimized gas consumption and low cost uses ammonia decomposition gas which is relatively stable compared with hydrogen in a high heat preservation stage and is also relatively low in production cost, greatly reduces the cost and saves the energy consumption, forms primary recrystallized grains for stress relief in the low heat preservation stage, decarburizes, performs secondary recrystallization in the high heat preservation stage, purifies steel and forms a sintered magnesium silicate bottom layer, finishes sintering an insulating coating and thermal stretching and flattening after the annealing is finished, ensures that the insulating coating has certain functions of stress relief and iron loss reduction, and aims to obtain better crystal phase texture by fast heating from the low heat preservation stage to the high heat preservation stage, namely to fully utilize Gauss oriented grains to grow preferentially to form more coarse Gauss crystal nuclei or reduce primary crystal grains caused by growth of defects of inhibitor distribution and the like, the process effectively enhances the magnetic property of the finished product, saves energy consumption and reduces cost.
Drawings
FIG. 1 is a diagram illustrating the high temperature annealing process of oriented silicon steel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a high temperature annealing process for oriented silicon steel with low gas consumption optimization cost includes the following steps:
s1, charging the casting blank into a furnace
Cleaning a furnace platform by using high-pressure air before charging, sweeping dust or other impurities in a vent pipe, selecting a material tray and a material basket matched with the steel coil according to the coil diameter of the steel coil, and putting a casting blank into the furnace;
s2, sealing the furnace platform
The furnace platform filled with the casting blank is completely sealed, the interior of the furnace platform is heated by using a natural gas heating or electric heating mode, the furnace platform uses electric heating, in order to form stable furnace gas flow in a furnace, the position (high-pressure area) of a supply point of protective gas (including an emergency gas source) is reasonable, the structure of a hearth can be partitioned into 'pressure-holding' regions, the size of a protective gas discharge port can be flexibly adjusted, the supply point of the protective gas is uniformly distributed, the protective gas can be ensured to flow into the upper hearth side and the lower hearth side of a strip steel, the dry region and the wet region in the furnace are thoroughly isolated, the isolation is realized by adjusting an isolation device and furnace pressures on the two sides of the isolation device, the isolation device is formed into a relative negative pressure region, and the atmosphere;
s3, heating and raising the temperature
Introducing nitrogen into the furnace before heating, evacuating air in the furnace, heating by using natural gas, and performing pressure control through the introduction amount of the nitrogen to ensure that protective gas in a low-temperature region flows towards a high-temperature region and avoid potential safety hazard of hydrogen;
s4, low-temperature-keeping stage
Heating the furnace body to 550 +/-20 ℃ under the nitrogen protection atmosphere, protecting the furnace body by using ammonia decomposition gas after the temperature is raised to 550 +/-20 ℃, then heating to 600 ℃ under the same atmosphere and preserving the temperature, wherein the ratio of nitrogen to ammonia decomposition gas in the step S4 is 1:1, removing the water of combination in magnesium oxide, and controlling the atmosphere dew point to be below 0 ℃, so that the increase of the contents of ferrous oxide and ferrous silicate in a surface oxidation film can be effectively avoided, and the quality of a later formed bottom layer is poor;
s5, high heat preservation stage
After the low heat preservation is finished, raising the temperature to 1150 ℃, then protecting with ammonia decomposition gas, carrying out secondary recrystallization in the process, and purifying the silicon steel in the furnace, namely removing nitrogen and sulfur in the silicon steel, wherein the ratio of the ammonia decomposition gas to nitrogen is 3:2, the ammonia decomposition gas with the temperature of less than-15 ℃ is used when the temperature reaches 1000 ℃ to form a bottom layer, and the ammonia decomposition gas with the temperature of less than-60 ℃ is replaced when the temperature is raised to 1200 ℃;
s6, cooling stage
After the high temperature preservation is finished, cooling by using ammonia decomposition gas protection, cooling to below 1000 ℃, changing into nitrogen, cooling to 500 ℃, discharging, and performing leveling stretching annealing and insulating film coating after high temperature annealing.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A high-temperature annealing process for oriented silicon steel with low gas consumption optimization cost is characterized in that: the method comprises the following steps:
s1, charging the casting blank into a furnace
Cleaning a furnace platform by using high-pressure air before charging, sweeping dust or other impurities in a vent pipe, selecting a material tray and a material basket matched with the steel coil according to the coil diameter of the steel coil, and putting a casting blank into the furnace;
s2, sealing the furnace platform
Completely sealing the furnace platform filled with the casting blank, heating the interior of the furnace platform by using a natural gas heating or electric heating mode, and electrically heating the furnace platform;
s3, heating and raising the temperature
Introducing nitrogen into the furnace before heating, evacuating air in the furnace and then heating by using natural gas;
s4, low-temperature-keeping stage
Heating the furnace body to 550 +/-20 ℃ under the nitrogen protection atmosphere, protecting the furnace body by using ammonia decomposition gas after the temperature is raised to 550 +/-20 ℃, and then heating to 600 ℃ under the same atmosphere and preserving the temperature;
s5, high heat preservation stage
After the low-temperature insulation is finished, raising the temperature to 1150 ℃, then protecting the silicon steel by using ammonia decomposition gas, carrying out secondary recrystallization in the process, and purifying the silicon steel in the furnace, namely removing nitrogen and sulfur in the silicon steel;
s6, cooling stage
After the high heat preservation is finished, cooling by using ammonia decomposition gas protection, cooling to below 1000 ℃, replacing nitrogen gas, cooling to 500 ℃, and discharging.
2. The high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost as claimed in claim 1, which is characterized in that: the ratio of nitrogen to ammonia decomposition gas in step S4 was 1: 1.
3. The high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost as claimed in claim 1, which is characterized in that: in the step S4, the water of combination in the magnesium oxide is removed, and the dew point of the atmosphere is controlled below 0 ℃.
4. The high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost as claimed in claim 1, which is characterized in that: the ratio of ammonia decomposition gas to nitrogen gas in the step of S5 is 3: 2.
5. The high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost as claimed in claim 1, which is characterized in that: and in the S5, ammonia decomposition gas with the temperature of less than-15 ℃ is used when the temperature reaches 1000 ℃ to form a bottom layer, and the ammonia decomposition gas with the temperature of less than-60 ℃ is replaced when the temperature is increased to 1200 ℃.
6. The high-temperature annealing process for oriented silicon steel with low gas consumption and optimized cost as claimed in claim 1, which is characterized in that: and carrying out flattening, stretching and annealing and coating an insulating film after carrying out high-temperature annealing.
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| CN202011472336.XA CN112593053A (en) | 2020-12-14 | 2020-12-14 | Oriented silicon steel high-temperature annealing process with low gas consumption optimization cost |
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| CN202011472336.XA CN112593053A (en) | 2020-12-14 | 2020-12-14 | Oriented silicon steel high-temperature annealing process with low gas consumption optimization cost |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807583A (en) * | 2022-03-21 | 2022-07-29 | 光丰(肇庆)钢业有限公司 | Production process of steel belt |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110139313A1 (en) * | 2008-03-25 | 2011-06-16 | Baoshan Iron & Steel Co., Ltd. | Manufacturing method of oriented si steel with high electric-magnetic property |
| US20120000262A1 (en) * | 2008-12-31 | 2012-01-05 | Baoshan Iron & Steel Co., Ltd. | Method for manufacturing grain-oriented silicon steel with single cold rolling |
| CN102534363A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Energy-saving and high-production-efficiency method for preparing common grain-oriented silicon steel |
| CN105112617A (en) * | 2015-09-25 | 2015-12-02 | 包头市威丰电磁材料有限责任公司 | Novel high-temperature annealing process of cold-rolled oriented silicone steel |
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2020
- 2020-12-14 CN CN202011472336.XA patent/CN112593053A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110139313A1 (en) * | 2008-03-25 | 2011-06-16 | Baoshan Iron & Steel Co., Ltd. | Manufacturing method of oriented si steel with high electric-magnetic property |
| US20120000262A1 (en) * | 2008-12-31 | 2012-01-05 | Baoshan Iron & Steel Co., Ltd. | Method for manufacturing grain-oriented silicon steel with single cold rolling |
| CN102534363A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Energy-saving and high-production-efficiency method for preparing common grain-oriented silicon steel |
| CN105112617A (en) * | 2015-09-25 | 2015-12-02 | 包头市威丰电磁材料有限责任公司 | Novel high-temperature annealing process of cold-rolled oriented silicone steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807583A (en) * | 2022-03-21 | 2022-07-29 | 光丰(肇庆)钢业有限公司 | Production process of steel belt |
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Application publication date: 20210402 |