CN113265565B - Iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction and preparation method thereof - Google Patents
Iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction and a preparation method thereof. The alloy comprises the following components in percentage by mass: 70.00 to 75.00 percent of nickel; 0.20 to 1.00 percent of manganese; 0.15 to 0.50 percent of silicon; 0.50 to 2.50 percent of molybdenum; 0.10 to 0.40 percent of chromium; 0-2.00% of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities. The method comprises the steps of smelting, forging, hot rolling and cold rolling to finally prepare the iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction. The high-permeability high-magnetic-induction iron-nickel soft magnetic alloy cold-rolled strip prepared by the invention has higher mu0、μmAnd Bs, and low Hc,. mu.0＞180mH/m，μmMore than 600mH/m, Bs is more than 1.20T, Br is less than 0.3T, Hc is less than 0.8A/m, and the electromagnetic device manufactured by the method can meet the use requirements under certain specific conditions, thereby being beneficial to improving the response speed of the electromagnetic device and realizing the miniaturization of the electromagnetic device. The iron-nickel soft magnetic alloy cold-rolled strip with high magnetic conductivity and high magnetic induction prepared by the invention has good processing performance, simple processing technology and heat treatment technology and low cost, and is suitable for industrial production.
Description
Technical Field
The invention relates to the field of alloys, in particular to an iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction and a preparation method thereof.
Background
With the rapid development of the current electronics and informatization fields, the soft magnetic alloy used for manufacturing the traditional electrical equipment can not meet the performance requirement which is increasing day by day, and a novel soft magnetic alloy needs to be developed to meet the new use requirement. Iron-nickel soft magnetic alloy is highInitial permeability mu0High maximum magnetic permeability mumAnd low coercivity Hc, as well as good processability, have been widely used in many electromagnetic device applications. The Fe-Ni soft magnetic alloy generally refers to an alloy series with 35-90% of nickel content, and is classified by medium-nickel soft magnetic alloy and high-nickel soft magnetic alloy, wherein the medium-nickel soft magnetic alloy generally has 40-60% of nickel content, common alloys such as national standard 1J46 and 1J50 alloy, foreign 45H and PB series alloys and the like, and the alloys have high magnetic induction Bs (Bs is more than or equal to 1.50T) but mu although the alloys have high magnetic induction Bs (Bs is more than or equal to 1.50T)0And mumIs generally low (mu)0≤20mH/m，μmLess than or equal to 200mH/m), and Hc is higher (Hc is more than or equal to 3A/m), which easily causes overlarge loss, leads to the reduction of the reaction sensitivity of the electromagnetic device and the performance reduction. The high nickel soft magnetic alloy usually has 70-90% of nickel content, common alloys such as national standard 1J79 and 1J85 alloy, and foreign 78H and PC series alloy, etc., although having lower Hc (Hc < 2.0A/m) and higher mu0And mum(μ0≥30mH/m，μm200mH/m) but has low Bs (Bs < 1.10T), and the alloy is easy to reach saturation under a specific use environment, so that the application of the alloy is limited.
The prior scholars have filed for relevant patents related to high-permeability high-nickel soft magnetic alloys, such as publications CN 102723158B and EP 1283275A1, and the two patents further improve the mu by optimizing the gold composition on the basis of the performance of the existing high-nickel soft magnetic alloy0And mumAnd Hc is reduced, but Bs is generally between 0.6T and 0.9T, compared with the existing high-nickel soft magnetic alloy, the alloy is not obviously improved, the alloy is easy to reach a saturation state during application, the miniaturization design requirement of an electromagnetic device is not facilitated, and the application limit of the current high-nickel soft magnetic alloy in a specific field cannot be broken through. The publication No. CN 112176222A comprises the following components in percentage by mass: 13-50% of iron, 0-6% of molybdenum, 0.1-0.6% of silicon, 0.2-0.8% of manganese, 2.0-8.2% of copper, 0.001-0.1% of cerium, and the balance of nickel and inevitable impurities, wherein the magnetic performance of the soft magnetic alloy is optimized on the basis of the performance of the existing soft magnetic alloy by optimizing alloy components and adding a proper amount of rare earth Ce element, but the Hc is higher, so that the loss is high easily caused during application,and the addition of expensive rare earth elements is not beneficial to reducing the production cost.
As described above, the conventional high nickel-based soft magnetic alloy cannot simultaneously have high magnetic permeability and high magnetic induction. Therefore, in order to solve the existing problems, a mu needs to be developed0＞180mH/m，μmMore than 600mH/m, Bs more than 1.20T, Br less than 0.3T and Hc less than 0.8A/m, can meet the use requirements of high-performance iron-nickel soft magnetic alloys under specific conditions, and simultaneously enriches the series of the existing high-nickel soft magnetic alloys.
Disclosure of Invention
Therefore, the invention provides the iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction and the preparation method thereof, and aims to solve the problem that the existing high-nickel soft magnetic alloy cannot have the characteristics of high magnetic conductivity and high magnetic induction at the same time.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the first aspect of the invention, the iron-nickel soft magnetic alloy with high magnetic permeability and high magnetic induction provided by the invention comprises the following components in percentage by mass: 70.00 to 75.00 percent of nickel; 0.20 to 1.00 percent of manganese; 0.15 to 0.50 percent of silicon; 0.50 to 2.50 percent of molybdenum; 0.10 to 0.40 percent of chromium; 0 to 2.00 percent of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities.
Further, the inevitable impurities are impurities carried in the raw materials of nickel, manganese, silicon, molybdenum, chromium, copper, carbon and iron; the total amount of the unavoidable impurities is less than 0.10%.
Further, the magnetic property of the alloy is as follows: mu.s0＞180mH/m，μm＞600mH/m，Bs＞1.20T，Br＜0.3T，Hc＜0.8A/m。
According to a second aspect of the present invention, there is provided a method for preparing the above-mentioned iron-nickel soft magnetic alloy with high permeability and high magnetic induction, the method comprising:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, copper, iron and carbon are mixed and smelted according to chemical composition proportion, silicon and manganese are added 10min to 1.5h before tapping, tapping can be carried out after complete melting, and steel ingots are cast; cooling the steel ingot to room temperature by air cooling, and removing oxide skin on the surface of the steel ingot to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
After heating and heat preservation, the descaled steel ingot is forged and pressed into a flat blank at the heat preservation temperature; cooling the flat blank to room temperature, and removing oxide skin on the surface of the flat blank to obtain a descaled flat blank; heating and insulating the descaling flat blank, and then hot-rolling the descaling flat blank into a hot-rolled strip; after the hot rolled strip is cooled to room temperature, removing oxide skin on the surface of the hot rolled strip to obtain a descaled hot rolled strip;
step three, cold rolling
Performing cold rolling processing on the hot rolled strip with the scale removed at room temperature; if intermediate continuous furnace annealing is needed, annealing the cold strip blank semi-finished product by adopting an intermediate continuous annealing furnace; cooling the annealed semi-finished cold strip blank to room temperature, and then continuously cold rolling to obtain a finished cold strip; the finished product of the cold zone passes through H at 1100-1200 DEG C2And annealing in a furnace to obtain the iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction.
Further, in the first step, the smelting temperature is 1400-1600 ℃, and the tapping temperature is 1400-1600 ℃.
Further, in the second step, the heat preservation temperature is 900-.
Further, in the third step, the intermediate continuous furnace annealing adopts H at 900-1150 DEG C2The atmosphere is carried out at a speed of 0.5-2.0 m/min.
Further, in the third step, the cooling speed of the semi-finished product when the semi-finished product is cooled to the room temperature is more than 500 ℃/h.
Further, in the third step, the rolling deformation of the cold-processed finished product of the cold-rolled finished product of the cold strip is 80% -95%.
Further, in the third step, the thickness of the finished product of the cold belt is 0.05-1.00 mm.
The influence of the chemical components of the raw materials adopted by the invention on the alloy of the invention is as follows:
nickel: increase the mu of the alloy0And mumReduction of Hc, too low a nickel content tends to increase Hc and decrease μ0And mumToo high nickel content tends to result in a decrease in Bs. To make the alloy have a high mu0、μmAnd Bs, and Hc is reduced, so the nickel content is preferably (in mass%) 70.00-75.00%;
manganese: adjusting the magnetocrystalline anisotropy constant and the magnetostriction coefficient of the alloy to enable the magnetocrystalline anisotropy constant and the hysteresis expansion coefficient of the alloy to approach zero, thereby being beneficial to reducing the Hc of the alloy;
silicon: the resistivity of the alloy is improved, and the eddy current loss of the alloy is reduced;
molybdenum: the magnetocrystalline anisotropy constant and the magnetostriction coefficient of the alloy are adjusted to lead the magnetocrystalline anisotropy constant and the hysteresis expansion coefficient of the alloy to approach zero, inhibit the generation of long-range order in the heat treatment process of the alloy, contribute to reducing the Hc of the alloy and improve the mu0And mumMeanwhile, the requirement of the alloy on the cooling speed in the heat treatment process of the finished product is reduced, and the method is suitable for industrial production;
copper: adjusting the magnetocrystalline anisotropy constant and the magnetostriction coefficient of the alloy, and improving the cold processing performance of the alloy;
chromium: the resistivity is improved, the eddy current loss is reduced, and the corrosion resistance of the alloy is improved;
carbon: the content is controlled below 0.01% (mass percent). Carbon is an element that forms interstitial solid solutions, and interstitial atoms will cause domain wall displacement resistance, adversely affecting the magnetic properties of the alloy.
The invention has the following advantages:
the iron-nickel soft magnetic alloy cold-rolled strip with high magnetic conductivity and high magnetic induction prepared by the invention has higher mu0、μmAnd Bs, and low Hc, μ0＞180mH/m，μmMore than 600mH/m, Bs is more than 1.20T, Br is less than 0.3T, and Hc is less than 0.8A/m, so that the prepared iron-nickel soft magnetic alloy has higher magnetic conductivity and magnetic induction; the electromagnetic device manufactured by the material can meet the use requirements under certain specific conditions and is beneficial to improving the electromagnetismThe device response speed is high, and the miniaturization of the electromagnetic device is realized.
The iron-nickel soft magnetic alloy cold-rolled strip with high magnetic conductivity and high magnetic induction prepared by the invention has good processing performance, simple processing technology and heat treatment technology and low cost, and is suitable for industrial production.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
The invention aims to provide a novel iron-nickel soft magnetic alloy aiming at the defects of the existing alloy, and the alloy has higher mu compared with the traditional high-nickel soft magnetic alloy0、μmAnd Bs, and simultaneously has low Hc, electromagnetic devices manufactured by the alloy meet the use requirements under certain specific conditions, and the alloy improves the existing high-nickel soft magnetic alloy series.
The design guiding thought of the invention is as follows: taking iron and nickel as basic chemical components, obtaining higher Bs of the alloy by optimizing the proportion of the iron and nickel, properly adding molybdenum, copper, chromium and manganese elements, adjusting the magnetostriction coefficient and magnetocrystalline anisotropy constant of the alloy, and obtaining higher mu of the alloy after heat treatment0And mumAnd low Hc, and simultaneously improves the resistivity of the alloy, reduces the eddy current loss and improves the corrosion resistance of the alloy.
Embodiment 1 iron-nickel soft magnetic alloy with high magnetic permeability and high magnetic induction and preparation method thereof
The iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction comprises the following components in percentage by mass: 70.50 percent of nickel; 0.20 percent of manganese; 0.20% of silicon; 0.60 percent of molybdenum; 0.15 percent of chromium; carbon is less than 0.01 percent; the balance of iron and inevitable impurities (the inevitable impurities are impurities carried by the raw materials of nickel, manganese, silicon, molybdenum, chromium, carbon and iron per se, and the total amount of the inevitable impurities is less than 0.1%).
The preparation method of the alloy comprises the following steps:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, iron and carbon are mixed according to the chemical composition ratio, are mixed and loaded at 1400-1600 ℃ for smelting, silicon and manganese are added 10min-1.5h before tapping, tapping can be carried out after complete melting, the tapping temperature is 1400-1600 ℃, and steel ingots are cast; removing oxide skin on the surface of the steel ingot after the steel ingot is cooled to room temperature to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
The heating and heat preservation temperature of the forging and the hot rolling is 900-1150 ℃, the heat preservation time of the forging and the hot rolling is 1-5h, the cooling rate of the forging and the hot rolling is not higher than 200 ℃/h, and the cooling rate of the forging and the hot rolling after being cooled to the room temperature is not lower than 500 ℃/h. And after forging and hot rolling, surface oxide skin needs to be polished, and the thickness of a hot rolled strip is 4.0 mm.
Step three, cold rolling
And (3) carrying out 95% of cold-processing on the hot-rolled strip with the scale removed at room temperature to obtain a finished cold strip with the thickness of 0.2 mm.
H of finished product strip passing through 1100-1200 DEG C2After heat treatment, the magnetic property of the obtained alloy is as follows: mu.s0＝180mH/m，μm＝625mH/m，Bs＝1.30T，Br＝0.28T，Hc＝0.7A/m。
Embodiment 2 iron-nickel soft magnetic alloy with high magnetic permeability and high magnetic induction and preparation method thereof
The iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction comprises the following components in percentage by mass: 72.00 percent of nickel; 0.40 percent of manganese; 0.30% of silicon; 1.50% of molybdenum; 0.15 percent of chromium; 0.50% of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities (the inevitable impurities are impurities carried by the raw materials of nickel, manganese, silicon, molybdenum, chromium, copper, carbon and iron per se, and the total amount of the inevitable impurities is less than 0.1%).
The preparation method of the alloy comprises the following steps:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, iron and carbon are mixed according to the chemical composition ratio, are mixed and loaded at 1400-1600 ℃ for smelting, silicon and manganese are added 10min-1.5h before tapping, tapping can be carried out after complete melting, the tapping temperature is 1400-1600 ℃, and steel ingots are cast; removing oxide skin on the surface of the steel ingot after the steel ingot is cooled to room temperature to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
The heating and heat preservation temperature of the forging and the hot rolling is 900-1150 ℃, the heat preservation time of the forging and the hot rolling is 1-5h, the cooling rate of the forging and the hot rolling is not higher than 200 ℃/h, and the cooling rate of the forging and the hot rolling after being cooled to the room temperature is not lower than 500 ℃/h. After forging and hot rolling, surface oxide skin needs to be polished, and the thickness of a hot rolled strip is 6.0 mm.
Step three, cold rolling
Cold rolling the hot rolled strip with the scale removed to a cold strip semi-finished product with the thickness of 5.0mm at room temperature; then the semi-finished product cold belt adopts H within the temperature range of 900-1150 DEG C2Annealing in a continuous annealing furnace at a speed of 0.5-2 m/min, and cooling to room temperature at a cooling rate of more than 500 ℃/h; and rolling and deforming by 93% of the cold-processed finished product to obtain a cold strip finished product with the thickness of 0.35 mm.
H of 1100-1200 ℃ for finished strip2After heat treatment, the magnetic property of the obtained alloy is as follows: mu.s0＝250mH/m，μm＝670mH/m，Bs＝1.28T，Br＝0.27T，Hc＝0.6A/m。
Embodiment 3 iron-nickel soft magnetic alloy with high magnetic permeability and high magnetic induction and preparation method thereof
The iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction comprises the following components in percentage by mass: 73.50 percent of nickel; 0.60 percent of manganese; 0.30% of silicon; 1.80 percent of molybdenum; 0.20 percent of chromium; 0.80% of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities (the inevitable impurities are impurities carried by the raw materials of nickel, manganese, silicon, molybdenum, chromium, copper, carbon and iron per se, and the total amount of the inevitable impurities is less than 0.1%).
The preparation method of the alloy comprises the following steps:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, iron and carbon are mixed according to chemical composition proportion, are mixed and loaded at 1400-1600 ℃ for smelting, silicon and manganese are added 10min-1.5h before tapping, tapping can be carried out after complete melting, the tapping temperature is 1400-1600 ℃, and steel ingots are cast; removing oxide skin on the surface of the steel ingot after the steel ingot is cooled to room temperature to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
The heating and heat preservation temperature of the forging and the hot rolling is 900-1150 ℃, the heat preservation time of the forging and the hot rolling is 1-5h, the cooling rate of the forging and the hot rolling is not higher than 200 ℃/h, and the cooling rate of the forging and the hot rolling after being cooled to the room temperature is not lower than 500 ℃/h. And after forging and hot rolling, surface oxide skin needs to be polished, and the thickness of a hot rolled strip is 4.0 mm.
Step three, cold rolling
Cold rolling the hot rolled strip with the scale removed to obtain a cold strip semi-finished product with the thickness of 1.3mm at room temperature; then the semi-finished product cold belt adopts H within the temperature range of 900-1150 DEG C2Annealing in a continuous annealing furnace at a speed of 0.5-2 m/min, and cooling to room temperature at a cooling rate of more than 500 ℃/h; after rolling deformation of the cold-processed finished product of 85 percent, a cold strip finished product with the thickness of 0.2mm is prepared.
H of 1100-1200 ℃ for finished strip2After heat treatment, the magnetic property of the obtained alloy is as follows: mu.s0＝270mH/m，μm＝685mH/m，Bs＝1.25T，Br＝0.25T，Hc＝0.55A/m。
Embodiment 4 iron-nickel soft magnetic alloy with high magnetic permeability and high magnetic induction and preparation method thereof
The iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction comprises the following components in percentage by mass: 74.50% of nickel; 0.50 percent of manganese; 0.40% of silicon; 2.00 percent of molybdenum; 0.20 percent of chromium; 1.20 percent of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities (the inevitable impurities are impurities carried by the raw materials of nickel, manganese, silicon, molybdenum, chromium, copper, carbon and iron per se, and the total amount of the inevitable impurities is less than 0.1%).
The preparation method of the alloy comprises the following steps:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, iron and carbon are mixed according to chemical composition proportion, are mixed and loaded at 1400-1600 ℃ for smelting, silicon and manganese are added 10min-1.5h before tapping, tapping can be carried out after complete melting, the tapping temperature is 1400-1600 ℃, and steel ingots are cast; removing oxide skin on the surface of the steel ingot after the steel ingot is cooled to room temperature to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
The heating and heat preservation temperature of the forging and the hot rolling is 900-1150 ℃, the heat preservation time of the forging and the hot rolling is 1-5h, the cooling rate of the forging and the hot rolling is not higher than 200 ℃/h, and the cooling rate of the forging and the hot rolling after being cooled to the room temperature is not lower than 500 ℃/h. After forging and hot rolling, surface oxide skin needs to be polished, and the thickness of a hot rolled strip is 4.5 mm.
Step three, cold rolling
Cold rolling the hot rolled strip with the scale removed to obtain a cold strip semi-finished product with the thickness of 4.0mm at room temperature; then the semi-finished product cold belt adopts H within the temperature range of 900-1150 DEG C2Annealing in a continuous annealing furnace at a speed of 0.5-2 m/min, and cooling to room temperature at a cooling rate of more than 500 ℃/h; after the rolling deformation of the cold-processed finished product of 95 percent, a cold strip finished product with the thickness of 0.2mm is prepared.
H of finished product strip passing through 1100-1200 DEG C2After heat treatment, the magnetic property of the obtained alloy is as follows: mu.s0＝285mH/m，μm＝700mH/m，Bs＝1.23T，Br＝0.23T，Hc＝0.4A/m。
As can be seen from examples 1 to 4, the iron-nickel soft magnetic alloy cold-rolled strip with high magnetic permeability and high magnetic induction prepared by the invention has higher mu0、μmAnd Bs, and low Hc, μ0＞180mH/m，μmMore than 600mH/m, Bs more than 1.20T, Br less than 0.3T and Hc less than 0.8A/m, and the electromagnetic device manufactured by the material can meet the use requirements under certain specific conditions, thereby being beneficial to improving the response speed of the electromagnetic device and realizing the miniaturization of the electromagnetic device.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (2)
1. The iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction is characterized by comprising the following components in percentage by mass: 70.00 to 75.00 percent of nickel; 0.20 to 1.00 percent of manganese; 0.15 to 0.50 percent of silicon; 0.50 to 2.50 percent of molybdenum; 0.10 to 0.40 percent of chromium; 0 to 2.00 percent of copper; carbon is less than 0.01 percent; the balance of iron and inevitable impurities;
the inevitable impurities are impurities carried by raw materials of nickel, manganese, silicon, molybdenum, chromium, copper, carbon and iron; the total amount of the inevitable impurities is less than 0.10 percent;
the magnetic properties of the alloy are as follows: mu.s0＞180mH/m，μm＞600mH/m，Bs＞1.20T，Br＜0.3T，Hc＜0.8A/m；
The thickness of the iron-nickel soft magnetic alloy is 0.05-1.00 mm.
2. A method for preparing the high permeability, high magnetic induction iron-nickel soft magnetic alloy of claim 1, comprising:
step one, smelting
Under the vacuum condition, raw materials of nickel, molybdenum, chromium, copper, iron and carbon are mixed and smelted according to chemical composition proportion, silicon and manganese are added 10min to 1.5h before tapping, tapping can be carried out after complete melting, and steel ingots are cast; after the steel ingot is cooled to room temperature by air cooling, removing oxide skin on the surface of the steel ingot to obtain an oxide skin-removed steel ingot;
step two, forging and hot rolling
After heating and heat preservation, the descaled steel ingot is forged and pressed into a flat blank at the heat preservation temperature; cooling the flat blank to room temperature, and removing oxide skin on the surface of the flat blank to obtain a descaled flat blank; heating and insulating the descaling flat blank, and then hot-rolling the descaling flat blank into a hot-rolled strip; after the hot rolled strip is cooled to room temperature, removing oxide skin on the surface of the hot rolled strip to obtain a descaled hot rolled strip;
step three, cold rolling
Carrying out cold rolling processing on the descaled hot rolled strip at room temperature; if intermediate continuous furnace annealing is needed, annealing the cold strip blank semi-finished product by adopting an intermediate continuous annealing furnace; cooling the annealed semi-finished cold strip blank to room temperature, and then continuously cold rolling to obtain a finished cold strip; the finished product of the cold zone passes through H at 1100-1200 DEG C2Annealing in a furnace to obtain the iron-nickel soft magnetic alloy with high magnetic conductivity and high magnetic induction;
in the first step, the smelting temperature is 1400-1600 ℃, and the tapping temperature is 1400-1600 ℃;
in the second step, the heat preservation temperature is 900-1150 ℃, the heat preservation time is 1-5h, the cooling speed in the forging and hot rolling processing processes is not higher than 200 ℃/h, the cooling speed of the steel strip cooled to room temperature after the forging and hot rolling processing processes is more than 500 ℃/h, and the thickness of the hot rolled strip is 4.0-6.0 mm;
in the third step, the intermediate continuous furnace adopts H at the temperature of 900-1150 DEG C2The reaction is carried out at the speed of 0.5-2.0m/min in the atmosphere;
in the third step, the cooling speed of the semi-finished product to room temperature is more than 500 ℃/h;
in the third step, the rolling deformation of a cold-processed finished product of the cold-rolled finished product of the cold strip is 80-95%;
in the third step, the thickness of the finished product of the cold belt is 0.05-1.00 mm.
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Inventor after: Yang Fan Inventor after: Li Zhongyang Inventor after: Xu Mingzhou Inventor after: An Yang Inventor after: Zhang Rong Inventor before: Yang Fan Inventor before: Xu Mingzhou Inventor before: Li Zhongyang Inventor before: An Yang Inventor before: Zhang Rong |