CN110551885A - Novel high-magnetic-induction oriented silicon steel normalized cooling production method and product - Google Patents
Novel high-magnetic-induction oriented silicon steel normalized cooling production method and product Download PDFInfo
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- CN110551885A CN110551885A CN201810614677.2A CN201810614677A CN110551885A CN 110551885 A CN110551885 A CN 110551885A CN 201810614677 A CN201810614677 A CN 201810614677A CN 110551885 A CN110551885 A CN 110551885A
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D8/1261—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 following hot rolling
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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
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Abstract
The invention aims to provide a novel production method for normalizing and cooling high-magnetic-induction oriented silicon steel, which is used for improving the magnetic performance of the high-magnetic-induction oriented silicon steel and simultaneously improving the plate shape and the rolling property of an oriented silicon steel normalizing plate. The production method of the normalized cooling comprises the following steps: and (3) normalizing at 1050-1150 ℃, keeping the temperature for less than or equal to 20s, reducing the temperature to 900-950 ℃ at a cooling speed of 5-8 ℃/s, carrying out secondary heat preservation for 100-150 s, controlling the cooling speed to 10-15 ℃/s to 700-800 ℃, discharging, and carrying out water spray quenching.
Description
Technical Field
The invention belongs to the field of metal material manufacturing and processing, and particularly relates to a novel normalized cooling production method and a product of high-magnetic-induction oriented silicon steel.
Background
From the development trend of the transformer industry, the transformer is developed towards the directions of high capacity, high parameter, energy saving and intellectualization, the implementation strategy of pushing the energy-saving transformer is proposed in 2015 by the national power industry, the S9 type transformer is definitely eliminated step by step, the S13 type transformer is used in large quantity, particularly the requirement for high magnetic induction oriented silicon steel is obviously increased, and the development direction becomes the future.
The iron loss and the magnetic induction of the high magnetic induction grain-oriented silicon steel finished product are closely related to the whole process production process, and the normalizing process of the hot rolled plate is particularly critical. The invention discloses a method for producing high-magnetic-induction oriented silicon steel strips through three-section normalization (application number 2012105199065, publication number CN103074476, publication date: 2013.05.01), and aims to overcome the defects that materials are more and more brittle when being cooled and the magnetic induction value is lower along with the increase of heating temperature in the normalization process, so that the method for producing the high-magnetic-induction oriented silicon steel strips through three-section normalization with high magnetic induction, low iron loss and excellent cold rolling performance is provided. The method comprises the following specific steps: 1) after smelting and casting, heating the casting blank to 1100-1250 ℃; 2) carrying out hot rolling: rolling to be 6-15.3 times as thick as the finished product; 3) coiling, wherein the coiling temperature is controlled to be 500-700 ℃; 4) normalizing annealing is carried out in three sections: the temperature of the first stage is controlled to be 950-1150 ℃, the temperature of the second stage is controlled to be 1050-950 ℃, and the temperature of the third stage is controlled to be 950-800 ℃; 5) performing one-time cold rolling to the thickness of a finished product, and performing aging rolling at 130-250 ℃ during cold rolling; 6) Performing decarburization annealing in a wet N2+ H2 atmosphere, controlling the decarburization annealing temperature at 800-900 ℃ and the decarburization annealing time at 60-240 seconds; 7) nitriding and annealing are carried out, the nitriding and annealing temperature is controlled to be 750-980 ℃, the nitriding and annealing atmosphere is N2+ H2+ NH3, and the content of NH3 accounts for 1-30% of the total gas volume percentage; 8) carrying out high-temperature annealing at 700-1200 ℃ for at least 2 hours; and the annealing temperature is 750-1100 ℃, so that the volume percentage content of N2 in the atmosphere is not lower than 15%.
Chinese patent application 2009100482893 (publication No. CN101845582A published japanese 2010.09.29) discloses a production method of a high magnetic induction oriented silicon steel product, which comprises smelting, continuous casting, hot rolling, normalizing, cold rolling, decarburization annealing, MgO coating, high-temperature annealing and insulating coating, and is characterized in that normalizing comprises normalizing a hot rolled plate and synchronously completing nitriding, wherein the normalizing nitriding temperature is 1050-1150 ℃, the time is 50-100 s, the dew point is 15-75 ℃, the atmosphere is 5-35% NH3 (volume percentage), and the rest gas is N2; the N content permeated in the hot rolled plate after the normalizing nitriding is 60-250 ppm; the content of infiltrated [ N ] and nitriding parameters such as the thickness of the hot rolled plate, nitriding temperature, nitriding time, ammonia gas proportion and the like accord with the following relations: the permeated [ N ] content is-3.08 a2+0.04b +0.96C +4.12d + C wherein, a: hot rolled sheet thickness (mm); b: nitriding temperature (. degree. C.); c: nitriding time(s); d: ammonia gas proportion (%); c: a constant; after normalizing nitriding, controlling a cooling process to realize that the volume fraction of AlN particles with the size less than or equal to 300nm accounts for more than 60 percent of the total volume of AlN; and (3) normalizing and cooling, wherein the initial temperature of rapid cooling is 700-950 ℃, and the rapid cooling speed of cooling to 550 ℃ is 15-40 ℃/sec. In the production process of the high magnetic induction grain-oriented silicon steel, the hot rolled plate is normalized at high temperature under nitrogen, so that a large amount of fine AlN is precipitated, and the structure of the hot rolled plate is more uniform and the number of recrystallized grains is more. The general normalizing process is as follows: the normalizing temperature is 1050-1150 ℃, and the total normalizing time is 4-5 min. The initial cooling temperature and cooling rate are strictly controlled after normalization, because 10-50 nm AlN precipitates through the gamma → alpha phase transition during cooling. Generally, the temperature is maintained at 900-950 ℃ and then water is sprayed for rapid cooling, and FIG. 1 is a temperature process curve of the normalizing technology. This method has the following disadvantages in practical production: the temperature control is high and the energy consumption is large; spraying water directly at high temperature of 900-950 ℃ for quenching, but the AlN is not beneficial to precipitation of proper size; the internal stress is large in the quenching process, the shape is not good, and the cold rolling in the post process is not facilitated.
Disclosure of Invention
the invention aims to provide a novel production method for normalizing and cooling high-magnetic-induction oriented silicon steel, which is used for improving the magnetic performance of the high-magnetic-induction oriented silicon steel and simultaneously improving the plate shape and the rolling property of a high-magnetic-induction oriented silicon steel normalizing plate.
The production method comprises the following specific steps:
And (3) normalizing at 1050-1150 ℃, keeping the temperature for less than or equal to 20s, reducing the temperature to 900-950 ℃ at a cooling speed of 5-8 ℃/s, carrying out secondary heat preservation for 100-150 s, controlling the cooling speed to 10-15 ℃/s to 700-800 ℃, discharging, and carrying out water spray quenching.
And performing air cooling control after secondary heat preservation and normalization at 900-950 ℃, discharging at the cooling speed of 10-15 ℃/s-700-800 ℃, and aiming at completing gamma → alpha phase change in a normalizing furnace, reducing the precipitation of invalid AlN below 20nm caused by phase change in subsequent rapid cooling in a common cooling process, and realizing proper AlN precipitation and matrix structure uniformity improvement. Meanwhile, the tapping temperature is reduced, so that the brittleness and the plate shape of the hot rolled plate after normalized annealing are greatly improved, and the yield is improved.
Compared with the common normalizing cooling technology, the invention has the following beneficial effects:
by adopting a normalizing cooling process of the novel high-magnetic-induction oriented silicon steel, the precipitation of ineffective AlN (with the size of less than 20 nm) is reduced, and more Als are precipitated after nitriding; realizes the precipitation of AlN with proper size and the improvement of the uniformity of the structure, thereby improving the magnetic property of the product. Meanwhile, the tapping temperature is reduced, so that the brittleness and the plate shape of the hot rolled plate after normalized annealing are greatly improved, and the yield is improved. The high magnetic induction oriented silicon steel plate has excellent magnetic performance.
brief description of the drawings
Figure 1 is a temperature process curve of a prior art normalizing technique,
FIG. 2 is a temperature profile of a normalized cooling technique of the present invention
FIG. 3 distribution diagram of inhibitor AlN after normalization in example 3 of the present invention
FIG. 4 distribution diagram of inhibitor AlN after normalization of comparative example 3
Detailed Description
FIG. 2 is a temperature profile of a normalized cooling technique of the present invention. As shown in fig. 2, the high magnetic induction grain-oriented silicon steel plate to be normalized is normalized at 1050-; then, reducing the temperature to 900-950 ℃ at a cooling speed of 5-8 ℃/s, wherein the cooling time is about 25s, and carrying out secondary heat preservation for 100-150 s; then, controlling the cooling speed to be 10-15 ℃/s to 700-800 ℃ and discharging; then, water is sprayed to cool to normal temperature.
Wherein, after the secondary heat preservation and normalization at 900-950 ℃, air cooling control is carried out, and the cooling speed is 10-15 ℃/s to 700-800 ℃ for discharging. The second stage of the normalizing and cooling process is used for normalizing and heat preserving at 900-950 ℃ for 100-150 s, and then the second stage is discharged from the furnace at the cooling speed of 10-15 ℃/s-700-800 ℃. The method is different from the prior art of directly discharging the furnace after normalizing and heat preserving at 700-950 ℃.
The high magnetic induction grain-oriented silicon steel is produced according to the cooling process, the process parameters of the production processes of the invention example and the comparative example are shown in table 1, and the production effects are shown in table 2.
TABLE 1 List of the main process parameters of the examples according to the invention and of the comparative examples
TABLE 2 final magnetic properties measured for inventive and comparative examples
in tables 1 and 2, P1.7/50(W/kg) -the value of the core loss, i.e., the specific total loss in watts/kg measured at 1.7T for the magnetic polarization strength and at 50Hz for the alternating magnetic field; b800(T) -magnetic induction value. I.e. the value of the magnetic induction at a magnetic field strength H of 800A/m (expressed by the peak value).
As can be seen from the comparison between table 1 and table 2, the iron loss value and the magnetic induction intensity of the finished product in the embodiment of the normalizing process of the present invention are better than those in the prior art. In the normalizing process of the present invention listed in table 1, example 3 had the best process parameters, which corresponded to an iron loss value of 0.921 and a magnetic induction of 1.923.
Comparing the best distribution diagram of the normalized inhibitor AlN of the example 3 with that of the comparative example 3, and 3, the distribution diagram of the normalized inhibitor AlN of the example 3 of the invention; fig. 4 is a distribution diagram of the inhibitor AlN after normalization in comparative example 3.
From the plots of the inhibitor AlN of example 3 of fig. 3 and the AlN of comparative example 3 of fig. 4: in example 3, the amount of AlN, which is an effective inhibitor having a size of 20 to 30nm, precipitated more, the amount of AlN, which is an ineffective inhibitor having a size of 20nm or less, precipitated less, and precipitated less in a small amount in a size of 50nm, much less than the amount of AlN, which is an ineffective inhibitor having a size of 50nm, in comparative example 3. The condition of the effective inhibitor AlN after normalization is in agreement with the conclusion that the magnetic performance of example 3 is superior to that of comparative example 3.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A novel production method for normalizing and cooling high-magnetic-induction oriented silicon steel comprises the following steps:
Step 1): normalizing at 1050-1150 deg.c for less than 20s, cooling at 5-8 deg.c/s,
Step 2): in the normalizing process, when the temperature is reduced to 900-950 ℃, carrying out secondary heat preservation for 100-150 s, and controlling the cooling speed to be 10-15 ℃/s;
Step 3): discharging the product when the temperature is reduced to 700-800 ℃.
2. The production method according to claim 1, characterized in that:
Step 4): after step 3), water quench cooling is performed.
3. the production method according to claim 1, characterized in that: wherein the air cooling control is carried out after the secondary heat preservation and normalization at the temperature of 900-950 ℃, the cooling speed is 10-15 ℃/s to 700-800 ℃, the product is taken out of the furnace,
4. High magnetic induction grain-oriented silicon steel produced by the production method according to claims 1 and 3.
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| CN2018105625426 | 2018-06-04 | ||
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188756A (en) * | 1986-02-13 | 1987-08-18 | Kawasaki Steel Corp | Grain-oriented foil of high saturation magnetic flux density and its production |
| CN103074476A (en) * | 2012-12-07 | 2013-05-01 | 武汉钢铁(集团)公司 | Method for producing high-magnetic-induction oriented silicon strips through three-stage normalizing |
| CN107779727A (en) * | 2017-09-25 | 2018-03-09 | 北京首钢股份有限公司 | A kind of production method of orientation silicon steel |
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- 2018-06-14 CN CN201810614677.2A patent/CN110551885A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62188756A (en) * | 1986-02-13 | 1987-08-18 | Kawasaki Steel Corp | Grain-oriented foil of high saturation magnetic flux density and its production |
| CN103074476A (en) * | 2012-12-07 | 2013-05-01 | 武汉钢铁(集团)公司 | Method for producing high-magnetic-induction oriented silicon strips through three-stage normalizing |
| CN107779727A (en) * | 2017-09-25 | 2018-03-09 | 北京首钢股份有限公司 | A kind of production method of orientation silicon steel |
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Application publication date: 20191210 |