CN115109904A - Method for producing soft magnetic primary products made of metal - Google Patents
Method for producing soft magnetic primary products made of metal Download PDFInfo
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- CN115109904A CN115109904A CN202110289836.8A CN202110289836A CN115109904A CN 115109904 A CN115109904 A CN 115109904A CN 202110289836 A CN202110289836 A CN 202110289836A CN 115109904 A CN115109904 A CN 115109904A
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- metal
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- 239000002184 metal Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 claims abstract description 93
- 238000000137 annealing Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000005415 magnetization Effects 0.000 claims abstract description 9
- 239000000047 product Substances 0.000 claims description 37
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 description 35
- 239000012467 final product Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The invention relates to a method for producing soft magnetic primary products made of metal. Method for producing a soft-magnetic primary product made of metal having particularly good magnetization properties, wherein the method comprises the following method steps: -producing or providing a rollable metal blank of a metal product, -pre-rolling the metal blank to an intermediate thickness with a certain degree of deformation, wherein the degree of deformation is adjusted according to the degree of critical or supercritical rolling followed at the subsequent rolling, -heat treating the pre-rolled blank, preferably annealing the pre-rolled blank, -rolling the blank to a final thickness with a critical or supercritical degree of rolling, and subsequently annealing to adjust to a certain grain size, and-finishing the primary product.
Description
Technical Field
The invention relates to a method for producing soft-magnetic primary products made of metal with particularly good magnetization properties.
Background
Soft magnetic primary products are known in the prior art as electrical steel strips (elektrobands).
Soft magnetic materials are understood to be materials which can be easily magnetized and demagnetized, in particular under the action of external electric fields, conductors through which currents flow and magnetic fields, so that electrical energy can be optimally utilized by using them in electrical systems.
The soft-magnetic primary product is further processed into a final product, which is used, for example, in the manufacture of electrical machines. Depending on the application purpose and requirements, primary products with correspondingly suitable soft magnetic properties are selected and used.
If, for example for application purposes, the magnetic flux is not specified in a specific direction, but needs to have good magnetic properties in all directions, a primary product with isotropic properties is used. This is also referred to as grain-oriented electrical steel strip and is used, for example, in generators, motors or relays.
Such non-grain oriented materials are considered below.
These and other properties, such as permeability, remanence, flux density and saturation, and coercive field strength, describe the quality of the soft magnetic properties with respect to the material. These properties can and must be adjusted according to the respective application purpose of the product.
In order to produce electrical steel strips with such desired properties, semifinished products made of steel, preferably hot-rolled strips, are used as starting products in the prior art. In the case of the so-called non grain-oriented final annealed (schlussgegluht) electrical steel strip type, after pickling the hot-rolled strip, it is cold-rolled in a plurality of rolling passes to the desired final thickness and then final annealed, in which the rolled microstructure is recrystallized, the carbon content is adjusted to a very low value and coarse grain formation is caused, so that the material can be easily magnetized. The preliminary product (cold-rolled strip) is subsequently processed into a final product, the final product being punched out of the cold-rolled strip or cut out by means of laser cutting, for example. Deformation of the material must be absolutely avoided during the further processing, since dislocations are produced in the microstructure due to the deformation, which can significantly deteriorate the magnetizability of the material and lead to inadequate final products.
Another possibility for producing electrical steel strips with the desired properties consists in cold rolling a hot-rolled strip made of steel after pickling, in recrystallization annealing and then in cold rolling with a small degree of deformation (critical deformation) in order to cause a targeted grain growth and thus to facilitate the magnetizability of the material. Then, from this elementary product, a final product can be made, such as a punched and bent part or a deep-drawn part, wherein the final product, after its completion, must be subjected to a particular annealing, for example to eliminate dislocations introduced into the material microstructure upon deformation and to provide a product with optimal soft magnetic properties.
Such electrical steel strip is referred to as non grain oriented non-final annealed electrical steel strip.
The subsequent special annealing of the end product is complicated and expensive, since each individual component has to be transported to the annealing process.
Disclosure of Invention
The object of the invention is to provide an economically viable method with which the soft magnetic and mechanical properties of the primary product can be specifically adjusted, wherein in particular the properties can be adjusted with regard to the further processing of the deformation of the primary product, so that no complex heat treatment of the final product produced by the deformation of the primary product is required and a final product with good soft magnetic properties is provided.
Furthermore, the versatility of the process should be enriched, i.e. to provide alternative solutions for manufacturing primary products with particularly good soft magnetic properties.
In order to achieve this object, the invention proposes a method according to claim 1.
As a starting product, a rollable metal blank is manufactured or provided. The blank may be constructed, for example, from ferritic steel or other metallic materials and has isotropic properties.
The metal blank is first pre-rolled, wherein the pre-rolling is performed to an intermediate thickness. The degree of deformation during the pre-rolling is adjusted according to the degree of critical or supercritical (nachkritisch) rolling set in the subsequent rolling, so that only a slight deformation of the material in the critical or supercritical deformation range is still required with a small degree of rolling during the subsequent rolling to the final thickness. The degree of deformation in the pre-rolling to intermediate thickness is therefore dependent on the degree of critical or supercritical rolling in the rolling to final thickness.
After the pre-rolling, the blank is subjected to a heat treatment, preferably a recrystallization anneal.
Rolling is then carried out, wherein the blank is rolled to its desired final thickness with a critical or supercritical degree of rolling and further annealing is carried out after said rolling. By rolling with a critical or supercritical rolling degree and subsequent annealing, grain growth is induced in the metal microstructure, enabling easier and faster magnetization and demagnetization of the material.
When deforming a material rolled by a rolling degree less than the critical rolling degree, no or at least no significant grain growth occurs first in the microstructure. Grain growth in the microstructure is only induced when a critical degree of rolling is reached, wherein the maximum grain size is reached when deformation takes place at the critical degree of rolling. If the degree of rolling is greater than the critical degree of rolling (supercritical degree of rolling), the grain size decreases as the degree of rolling increases. The degree of rolling is selected such that grain growth is induced in the microstructure, i.e. at least a critical or supercritical degree of rolling, wherein the grain size and thus the magnetic properties can be specifically adjusted by the degree of rolling. The smaller the degree of rolling selected, the larger the grains produced in the microstructure and the better the magnetization, i.e. the easier and faster the material can be magnetized. At the same time, however, the mechanical properties of the material deteriorate as the grain size increases.
The grain size and the magnetic and mechanical properties associated therewith can and therefore should be set in a targeted manner by the degree of critical or supercritical rolling and adapted to the respective subsequent use of the material, so that a suitable primary product can be provided in a targeted manner for the respective use.
The soft magnetic properties introduced into the material by carrying out the method described make it possible to further process the primary product by deformation, for example deep drawing or bending, into a final product with particularly good soft magnetic properties without the final product having to be subjected to subsequent special annealing. This eliminates complex and expensive post-treatments of the individual products.
By means of the method, various primary products with particularly good soft magnetic properties can be produced and provided, for example strips, wires or similar semi-finished products made of metal, which are subsequently deformed into final products.
Preferably, the blank is a hot-rolled strip made of ferritic (or non-alloyed) steel.
Preferably, the blank is pre-rolled with a degree of deformation of 30 to 80% during the pre-rolling.
For example, in the case of hot strip processing, which is made of steel, a deformation degree of this order of magnitude is necessary in order to ensure that the material is deformed in the critical or supercritical range when subsequently rolled with a critical or supercritical rolling degree.
The thickness of the hot-rolled strip made of steel which is to be processed according to the method can be up to 50 mm.
If another blank or material is used, the degree of deformation is matched to the respective material-specific degree of critical or supercritical rolling.
Preferably, it is provided here that the annealing of the pre-rolled blank is carried out at a temperature of 550 ℃ to 700 ℃, wherein preferably the annealing is carried out for a period of up to 50 hours.
This results in a recrystallization of the microstructure after the pre-rolling.
It is furthermore preferably provided that the critical or supercritical rolling degree is 8 to 25%, preferably 9 to 15%, wherein it is preferably provided that the annealing after rolling with the critical or supercritical rolling degree is carried out at a temperature of at most 710 ℃ and that the annealing is carried out for a period of at most 80 hours.
By pre-rolling and subsequent annealing with a rolling degree within the indicated limits, the grain size of the non-alloyed steel can be adjusted variably and in accordance with the purpose of subsequent use of the primary product. Depending on the choice of material, the degree of rolling which is critical and therefore supercritical lies within the indicated range and can be adjusted to various grain sizes depending on the degree of rolling. For steel (alloy or non-alloy) it is possible to adjust to grain sizes of ASTM 1 to 6, where grain size decreases with increasing degree of deformation.
If another material is used, the degree of rolling is determined and used in the rolling, which is critical or supercritical specific to the material.
It is preferably provided that upstream heat treatment, preferably annealing, is carried out before the pre-rolling of the blank, wherein it is preferably provided that upstream annealing is carried out at a temperature of 650 to 800 ℃ and preferably for a period of time of at most 60 hours.
The upstream heat treatment, preferably annealing, serves to prepare the metal material of the blank for its processing and to bring the microstructure of the blank to an improved initial state.
In the case of blanks made of ferritic steel, the upstream heat treatment causes, for example, a change in the carbon content. Carbon randomly distributed in the microstructure before the heat treatment is deposited on the grain boundaries due to the heat treatment.
By the upstream heat treatment, the soft magnetic properties of the primary product can be additionally improved and a primary product with still better quality can be provided.
Preferably, it is provided that the blank is subjected to a final rolling before completion and after the final heat treatment, wherein preferably the final rolling is performed with a degree of deformation of 0.1 to 2%.
The exact thickness of the material and the flatness (Planlage) and quality of the surface can thus be adjusted.
Drawings
Embodiments of the method of the present invention are illustrated in the accompanying drawings and described in detail below.
Wherein:
fig. 1 shows a schematic flow of the method;
fig. 2 shows a tabular depiction of the magnetic and mechanical properties of a non-alloyed steel after the process was performed at various rolling levels.
Detailed Description
Fig. 1 schematically shows a flow of a method for producing a metallic soft magnetic primary product with particularly good magnetization characteristics.
The method is used to produce a primary product in the form of a cold-rolled strip from steel.
For this purpose, a rollable metal blank made of steel, i.e. a semi-finished product made of a non-alloyed steel, preferably a hot-rolled strip, is produced or provided as a starting product, wherein the material of the hot-rolled strip has isotropic properties.
The hot strip is first of all subjected to a pre-rolling, wherein the pre-rolling is carried out to an intermediate thickness. The degree of deformation during the pre-rolling is 30% to 80% and is adjusted depending on the critical or supercritical degree of rolling set later during the rolling to the final thickness, so that only a slight deformation of the material in the critical or supercritical deformation range is required even with a small degree of rolling during the rolling to the final thickness. The degree of deformation at rolling to intermediate thickness is therefore dependent on the degree of critical or supercritical rolling at rolling to final thickness.
The pre-rolled blank is subsequently heat treated, wherein the annealing is preferably carried out at a temperature of 550 ℃ to 700 ℃ for a period of time of at most 50 hours.
Annealing is followed by rolling, wherein the blank is rolled to its desired final thickness with a degree of rolling that is critical or supercritical, and further annealing after rolling is carried out at a temperature of at most 710 ℃ for a period of at most 80 hours. By rolling with a critical or supercritical rolling degree and subsequent annealing, grain growth is induced in the metal microstructure, whereby an easier and faster magnetization and demagnetization of the material can be achieved.
The deformation must be carried out at least at the critical rolling degree, since no or at least no significant grain growth occurs in the microstructure when deforming the material rolled by a rolling degree less than the critical rolling degree. Only when the deformation reaches the critical rolling degree, the maximum grain size is set when the deformation is reached, a significant grain growth is induced in the microstructure. If the rolling degree is greater than the critical rolling degree (supercritical rolling degree), the grain size decreases again, wherein the grain size becomes smaller as the supercritical rolling degree increases. Thereby adjusting to at least a critical or supercritical rolling degree, wherein the grain size and thus the magnetic properties can be specifically adjusted by the rolling degree. In the example shown, the degree of rolling is 11 to 25%. The results obtained in terms of magnetic and mechanical properties, achieved by deforming the material with such a degree of rolling, are shown in the table of figure 2. The smaller the selected degree of rolling, the larger the grains produced in the microstructure and the better the magnetization, i.e. the easier and faster the material can be magnetized. At the same time, however, the mechanical properties of the material deteriorate as the grain size increases.
The grain size and the magnetic and mechanical properties associated therewith are thus specifically adjusted by the degree of critical or supercritical rolling and are adapted to the respective subsequent use of the material, so that suitable primary products can be specifically provided for the respective use.
The soft magnetic properties introduced into the material in this way make it possible to further process the primary product by deformation, for example deep drawing or bending, into a final product with particularly good soft magnetic properties without the final product having to be subjected to subsequent special annealing. This eliminates complex and expensive post-treatments of the individual products.
After rolling and subsequent annealing, the blank is finally rolled with a degree of deformation of, for example, 0.7%. Thereby adjusting to the exact thickness of the material and the flatness and quality of the surface.
Furthermore, the blank can first be conveyed to annealing before the pre-rolling, in order to prepare the material for the subsequent method steps and to bring the microstructure to an improved initial state. The annealing is preferably carried out at a temperature of 650 ℃ to 800 ℃.
The carbon content of the microstructure is changed by annealing. Before the heat treatment, carbon is randomly distributed in the microstructure and deposited on the grain boundaries by annealing. Thereby, the carbon does not adversely interfere with the magnetization of the material later on, and the soft magnetic properties of the primary product can be additionally improved. It is possible to provide a primary product having particularly good quality.
After the upstream heat treatment, further method steps are then carried out.
By means of the method, it is possible to provide a primary product with particularly good soft magnetic properties, which can be conditioned in such a way that the material can subsequently be deformed, for example, into a deep-drawn or punched bent part with particularly good soft magnetic properties, without the final product having to be subjected to a subsequent particular annealing or comparable heat treatment.
The invention is not limited to this embodiment but may be varied within the scope of the disclosure.
All individual and combined features disclosed in the description and/or the drawings are considered to be essential to the invention.
Claims (13)
1. Method for producing a soft-magnetic primary product made of metal, preferably a strip, wire or similar semi-finished product made of metal, having particularly good magnetization properties, wherein the method comprises the following method steps:
-manufacturing or providing a rollable metal blank of a metal product,
pre-rolling the metal blank to an intermediate thickness with a specific degree of deformation, wherein the degree of deformation is adjusted according to the degree of critical or supercritical rolling followed at the subsequent rolling,
-heat treating, preferably annealing, the pre-rolled blank,
rolling the billet to a final thickness with a degree of rolling that is critical or supercritical and subsequently annealing to adjust to a specific grain size, and
-finishing the primary product.
2. Method according to claim 1, characterized in that the blank is a hot-rolled strip made of ferritic steel or non-alloyed steel.
3. Method according to claim 1 or 2, characterized in that the blank is pre-rolled with a degree of deformation of 30-80% when pre-rolled.
4. A method according to any one of claims 1 to 3, wherein the annealing of the pre-rolled blank is performed at a temperature of 550-700 ℃.
5. The method of claim 4, wherein the annealing is performed for up to 50 hours.
6. Method according to any of claims 1 to 5, characterized in that the critical rolling degree is 8 to 25%, preferably 9 to 15%.
7. Method according to any of claims 1 to 6, characterized in that the annealing after rolling at the critical rolling degree is carried out at a temperature of at most 710 ℃.
8. The method of claim 7, wherein the annealing is performed for a period of time up to 80 hours.
9. A method according to any one of claims 1 to 6, characterized in that an upstream heat treatment, preferably annealing, is carried out before the pre-rolling of the blank.
10. The method according to claim 9, characterized in that the upstream annealing is carried out at a temperature of 650 to 800 ℃.
11. Method according to claim 9 or 10, characterized in that the upstream annealing is carried out for a period of time of at most 60 hours.
12. Method according to any of claims 1 to 11, characterized in that the blank is subjected to final rolling before completion and after the final heat treatment.
13. Method according to claim 12, characterized in that the final rolling is carried out with a degree of deformation of 0.1 to 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110289836.8A CN115109904A (en) | 2021-03-18 | 2021-03-18 | Method for producing soft magnetic primary products made of metal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110289836.8A CN115109904A (en) | 2021-03-18 | 2021-03-18 | Method for producing soft magnetic primary products made of metal |
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| CN115109904A true CN115109904A (en) | 2022-09-27 |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1114448A (en) * | 1965-07-20 | 1968-05-22 | Steel Co Of Wales Ltd | Improvements in or relating to the production of electrical sheet or strip |
| JPS5970722A (en) * | 1982-10-13 | 1984-04-21 | Kawasaki Steel Corp | Production of electrical sheet having small anisotropy |
| JPS613838A (en) * | 1984-06-16 | 1986-01-09 | Kawasaki Steel Corp | Manufacture of electromagnetic steel sheet having small anisotropy |
| JPS6389621A (en) * | 1986-10-01 | 1988-04-20 | Kobe Steel Ltd | Production of core material for flat plate-shaped linear pulse motor |
| JPH05247604A (en) * | 1992-03-05 | 1993-09-24 | Kawasaki Steel Corp | Soft magnetic iron sheet excellent in magnetic property and its manufacture |
| CN1974820A (en) * | 2006-12-18 | 2007-06-06 | 马鞍山钢铁股份有限公司 | Process of producing semi-technological electrical steel |
| CN1982483A (en) * | 2005-12-16 | 2007-06-20 | 上海申群物资有限公司 | Production of non-directional cold-rolling silicon steel disc |
| CN101306434A (en) * | 2008-06-23 | 2008-11-19 | 首钢总公司 | Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel |
| CN105986176A (en) * | 2015-03-03 | 2016-10-05 | 鞍钢股份有限公司 | Production method of semi-process cold-rolled non-oriented electrical steel |
| CN110205462A (en) * | 2019-06-28 | 2019-09-06 | 武汉钢铁有限公司 | Used in high-speed motor method for producing non-oriented silicon steel |
-
2021
- 2021-03-18 CN CN202110289836.8A patent/CN115109904A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1114448A (en) * | 1965-07-20 | 1968-05-22 | Steel Co Of Wales Ltd | Improvements in or relating to the production of electrical sheet or strip |
| JPS5970722A (en) * | 1982-10-13 | 1984-04-21 | Kawasaki Steel Corp | Production of electrical sheet having small anisotropy |
| JPS613838A (en) * | 1984-06-16 | 1986-01-09 | Kawasaki Steel Corp | Manufacture of electromagnetic steel sheet having small anisotropy |
| JPS6389621A (en) * | 1986-10-01 | 1988-04-20 | Kobe Steel Ltd | Production of core material for flat plate-shaped linear pulse motor |
| JPH05247604A (en) * | 1992-03-05 | 1993-09-24 | Kawasaki Steel Corp | Soft magnetic iron sheet excellent in magnetic property and its manufacture |
| CN1982483A (en) * | 2005-12-16 | 2007-06-20 | 上海申群物资有限公司 | Production of non-directional cold-rolling silicon steel disc |
| CN1974820A (en) * | 2006-12-18 | 2007-06-06 | 马鞍山钢铁股份有限公司 | Process of producing semi-technological electrical steel |
| CN101306434A (en) * | 2008-06-23 | 2008-11-19 | 首钢总公司 | Preparation method of low carbon low silicon no-aluminum half-technique non oriented electrical steel |
| CN105986176A (en) * | 2015-03-03 | 2016-10-05 | 鞍钢股份有限公司 | Production method of semi-process cold-rolled non-oriented electrical steel |
| CN110205462A (en) * | 2019-06-28 | 2019-09-06 | 武汉钢铁有限公司 | Used in high-speed motor method for producing non-oriented silicon steel |
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