CN115704073B - Non-oriented electrical steel plate with good surface state and manufacturing method thereof - Google Patents
Non-oriented electrical steel plate with good surface state and manufacturing method thereof Download PDFInfo
- Publication number
- CN115704073B CN115704073B CN202110908763.6A CN202110908763A CN115704073B CN 115704073 B CN115704073 B CN 115704073B CN 202110908763 A CN202110908763 A CN 202110908763A CN 115704073 B CN115704073 B CN 115704073B
- Authority
- CN
- China
- Prior art keywords
- oriented electrical
- percent
- rolling
- electrical steel
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000005098 hot rolling Methods 0.000 claims abstract description 32
- 238000000137 annealing Methods 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- 230000006698 induction Effects 0.000 claims abstract description 23
- 238000005266 casting Methods 0.000 claims abstract description 17
- 238000005097 cold rolling Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 8
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 87
- 239000010959 steel Substances 0.000 claims description 87
- 238000009749 continuous casting Methods 0.000 claims description 56
- 238000005096 rolling process Methods 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 31
- 230000009467 reduction Effects 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 37
- 230000000052 comparative effect Effects 0.000 description 42
- 238000010438 heat treatment Methods 0.000 description 23
- 239000013078 crystal Substances 0.000 description 20
- 239000011575 calcium Substances 0.000 description 17
- 238000013461 design Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 239000000126 substance Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000001953 recrystallisation Methods 0.000 description 8
- 238000011282 treatment Methods 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 5
- 238000007670 refining Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000005389 magnetism Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a non-oriented electrical steel plate with good surface state, which contains Fe and unavoidable impurities, and also contains the following chemical elements in percentage by mass: c is more than 0 and less than or equal to 0.005 percent, si:1.0 to 2.0 percent, mn:0.2 to 1.0 percent, al:0.2 to 1.0 percent, ca:0.0003 to 0.010 percent, sb: 0.005-0.2%, wherein Si+Al:1.4 to 2.6 percent. In addition, the invention also discloses a manufacturing method of the non-oriented electrical steel plate, which comprises the following steps: (1) smelting; (2) casting; (3) hot rolling; (4) cold rolling; (5) continuous annealing. The non-oriented electrical steel sheet with good surface state has no corrugated defect, has lower iron loss and excellent magnetic induction, and has very good popularization prospect and application value.
Description
Technical Field
The present invention relates to a steel sheet and a method for manufacturing the same, and more particularly, to a non-oriented electrical steel sheet and a method for manufacturing the same.
Background
It is known that non-oriented electrical steel sheets having a high silicon content exhibit, on the surface of the finished strip, in the rolling direction, uneven corrugations, which are similar to corrugations, commonly known as "corrugated defects". The corrugated defect can obviously reduce the lamination coefficient of the finished strip steel, so that the finished strip steel is magnetic deteriorated and the interlayer resistance of an insulating film is reduced, and further the service performance and the service life of electric equipment or products are reduced. Therefore, in the practical application process, most users clearly require that the finished strip steel is not allowed to have corrugated defects.
The generation mechanism of the corrugated defect can be explained by that the equiaxed crystal rate in the continuous casting blank is lower, and the columnar crystal is thick and developed. Wherein the growth direction <001> of the columnar crystal corresponds to the (001) normal direction and is the direction of the maximum heat flow gradient. In the hot rolling process, coarse columnar crystals cannot be thoroughly broken due to dynamic recovery and slow recrystallization; the columnar crystals in the continuous casting blank are easy to grow along the heat flow direction, so that coarse columnar crystals with a certain orientation relationship are formed, and uneven deformation in the rolling process is caused; after hot rolling is finished, the center of the plate thickness is mainly a fibrous structure, austenite and ferrite phase transformation is avoided in the subsequent working procedures, recrystallization is difficult to achieve in the subsequent cold rolling and annealing processes, the uniformity of the structure cannot be eliminated, the structure is inherited to a finished product, and the corrugated defect with uneven surface is finally formed.
In order to meet the market demand, there is a need to obtain a non-oriented electrical steel sheet with good surface condition, which has no corrugated defects, and in order to obtain a non-oriented electrical steel sheet without corrugated defects, some researchers have combined different steel component designs and production line characteristics, and different solutions are provided.
For example: chinese patent publication No. CN1548569a, publication No. 11/24/2004, entitled "non-oriented electrical steel sheet free of corrugated defects and method for producing the same", discloses a non-oriented electrical steel sheet free of corrugated defects and method for producing the same, comprising the following components (weight percentage): c:0.006 to 0.01 percent, si is more than or equal to 0 and less than or equal to 2.0 percent, al is more than or equal to 0 and less than or equal to 0.4 percent, mn is less than or equal to 1.0 percent, and the balance is Fe and unavoidable impurities; the Si/C ratio is 180 to 260. The manufacturing method comprises the following steps: a. continuously casting a plate blank; b. heating a casting blank, rough rolling, wherein the rough rolling passes are less than or equal to 4 passes, the cumulative rolling reduction of rough rolling is more than or equal to 80%, the rolling reduction of at least one pass is more than or equal to 40%, and the rough rolling finishing temperature is more than or equal to 980 ℃; c. finish rolling, wherein at least one of the frames in front of the finish rolling continuous rolling unit adopts a roller with a rough roller surface, and the roller surface roughness is at least more than or equal to 5 mu m; d. coiling, and coiling the hot rolled plate at a high temperature of not less than 710 ℃. The invention can obtain the finished steel plate which completely eliminates corrugated defects through chemical component and process optimization; in addition, the invention omits the hot rolled plate normalizing procedure, which can reduce the production cost and improve the physical properties of the steel.
Also for example: chinese patent publication No. CN110218945a, publication No. 2019, 9, 10, entitled "non-oriented electrical steel free of corrugated defects and method for producing same", discloses a non-oriented electrical steel free of corrugated defects and method for producing same. The non-oriented electrical steel without corrugated defects comprises the following chemical components in percentage by weight: c is less than or equal to 0.003 percent, si is 1.0 percent to 2.2 percent, mn is 0.6 percent to 1.5 percent, als:0.1 to 0.4 percent, S is less than or equal to 0.0030 percent, P is less than or equal to 0.02 percent, cu is less than or equal to 0.1 percent, N is less than or equal to 0.0040 percent, ti is less than or equal to 0.0040 percent, and the balance is Fe and unavoidable impurities, wherein, 1.5 percent of Mn is less than or equal to Si percent+2 percent of Al is less than or equal to 2.5 percent of Mn; the preparation method comprises the following steps: molten iron pretreatment, converter smelting, RH treatment, continuous casting and rolling, pickling and cold rolling, continuous annealing and insulating coating application. The invention can be smoothly implemented on the existing sheet billet continuous casting and rolling production line through reasonable design of an alloy system without adding production equipment. The hot rolling structure obtained by ferrite rolling is recrystallized grains, so that the existence of fibrous structures extending along the rolling direction is avoided, and a hot rolling structure foundation is provided for the production of corrugated defect-free products.
For another example: the Chinese patent literature with publication number of CN102443734B and publication date of 2013, 6 and 19, named as corrugated defect-free non-oriented electrical steel plate and manufacturing method thereof discloses corrugated defect-free non-oriented electrical steel plate and manufacturing method thereof, wherein the corrugated defect-free non-oriented electrical steel plate comprises the following chemical components in percentage by weight: c: less than 0.005 percent, 1.2 to 2.2 percent of Si, 0.2 to 0.4 percent of Mn and P: less than 0.2%, S: less than 0.005%, al:0.2 to 0.6 percent, N: less than 0.005%, O: less than 0.005% and the balance of Fe; the blank is obtained after molten iron pretreatment, converter smelting, RH refining and continuous casting; wherein, the secondary cooling water quantity of continuous casting is controlled, the specific water quantity of the cooling water is required to be 100-190 l/min, and the average superheat degree of the continuous casting molten steel is 10-45 ℃; heating a plate blank, and hot rolling; the tapping temperature of the slab is 1050-1150 ℃, and the temperature difference between any two points along the length direction is less than 25 ℃ when the slab is heated; the hot rolling comprises rough rolling and finish rolling, and the inlet temperature of the finish rolling is more than or equal to 970 ℃; and (5) pickling, cold rolling, annealing and coating to obtain the finished non-oriented electrical steel plate. The invention can ensure that the outer surface of the manufactured steel plate has no corrugated defect by controlling the cooling speed of the plate blank during continuous casting, controlling the temperature difference of the plate blank in the heating furnace along the length direction and controlling the temperature drop before the plate blank finish rolling.
Based on this, the present invention is expected to obtain a new non-oriented electrical steel sheet having a good surface state and a method for manufacturing the same, which is mainly achieved by optimizing a manufacturing process to obtain a non-oriented electrical steel sheet having a good surface state without corrugated defects, unlike what is disclosed in the prior art, in view of market demands. The manufacturing method is simple to operate, low in cost, environment-friendly in cold connection and excellent in magnetism, and can realize the production of the non-oriented electrical steel plate without corrugated defects by strictly controlling the cooling temperature of the plate blank in the heating furnace and controlling the temperature difference of the plate blank in the length direction.
Disclosure of Invention
One of the purposes of the invention is to provide a non-oriented electrical steel sheet with good surface state, which can ensure that the steel has no corrugated defects while controlling lower production cost through reasonable chemical composition design and matching with an optimized manufacturing process.
The non-oriented electrical steel sheet with good surface state has no corrugated defect, low iron loss and excellent magnetic induction, and has high steel cleanliness, thus having very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a non-oriented electrical steel sheet with good surface condition, which contains Fe and unavoidable impurities, and further contains the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.005 percent, si:1.0 to 2.0 percent, mn:0.2 to 1.0 percent, al:0.2 to 1.0 percent, ca:0.0003 to 0.010 percent, sb: 0.005-0.2%; wherein Si+Al:1.4 to 2.6 percent.
Further, in the non-oriented electrical steel sheet, the mass percentage ratio of each chemical element is as follows:
c is more than 0 and less than or equal to 0.005 percent, si:1.0 to 2.0 percent, mn:0.2 to 1.0 percent, al:0.2 to 1.0 percent, ca:0.0003 to 0.010 percent, sb: 0.005-0.2%, and the balance of Fe and other unavoidable impurities; wherein Si+Al:1.4 to 2.6 percent; .
In the non-oriented electrical steel sheet without corrugated defects according to the present invention, the design principle of each chemical element is as follows:
in the invention, si and Al can be used for composite deoxidation, and the sum of Si and Al contents is important only because:
when the sum of Si and Al is lower than 1.4%, in the casting process of the step (2), the continuous casting billet has gamma-alpha phase transformation in the temperature range of 900-1300 ℃ (hot rolling temperature range), and under the condition of no electromagnetic stirring or electromagnetic braking in any forms such as a crystallizer, a secondary cooling area and the like, the phase transformation can eliminate the structure non-uniformity caused by coarse columnar crystals, and the corresponding corrugated defect can not appear on the surface of the finished steel plate, so the technical scheme does not need to solve the technical problem of the corrugated defect.
As the sum of si+al content in steel increases, the phase transformation gradually decreases, coarse columnar crystals are difficult to be effectively broken, and after the si+al content is higher than 2.6%, γ→α phase transformation disappears, and the uneven structure caused by the coarse columnar crystals in a casting blank cannot be eliminated by hot rolling. In this case, it is necessary to increase the equiaxed grain ratio in the cast slab and to reduce the coarse columnar grains by electromagnetic stirring, and it is also necessary to further eliminate the non-uniformity of the hot rolled structure by normalizing or annealing in the bell type furnace.
When the si+al content is 1.4 to 2.6%, as described above, it is difficult to completely eliminate the structural non-uniformity caused by the coarse columnar crystals in the cast slab by means of the phase transformation of the hot rolling itself without any form of electromagnetic stirring or electromagnetic braking in a crystallizer, a secondary cooling zone or the like and with the adoption of the normalizing or bell-type furnace intermediate annealing, and corrugated defects may occur on the surface of the finished steel sheet. Therefore, the technical proposal aims at solving the problem of corrugated defect of the steel type without phase change when the content of Si+Al is in the range of 1.4 to 2.6 percent.
At this time, 0.0003 to 0.010% of Ca element is added to the steel, which can effectively inhibit the growth of coarse columnar crystals in the continuous casting billet; ca in this range can improve the fluidity of the molten steel and improve the castability of the molten steel in the continuous casting process. Meanwhile, in the casting process based on the step (2) of the manufacturing method, when the superheat degree of molten steel is controlled to be 10-45 ℃, the casting speed is controlled to be 0.6-1.8 m/min. In the microstructure of the cast slab sample, columnar crystals are in the shape of a spindle of an elongated strip in the thickness direction of the continuous casting slab, and the ratio of the grain size of the continuous casting slab in the thickness direction to the grain size in the width direction is 2.5 to 6.0.
C: in the non-oriented electrical steel sheet of the present invention, when the content of the C element is more than 0.005%, it is easily combined with harmful elements such as Nb, V, ti, etc., to form a fine-sized and numerous harmful precipitates, thereby causing deterioration of iron loss of the finished steel sheet. Based on the above, in order to ensure the performance of the non-oriented electrical steel sheet, the non-oriented electrical steel sheet according to the present invention has a mass percentage ratio of C element of 0 < c.ltoreq.0.005%.
Si: in the non-oriented electrical steel sheet according to the present invention, the content of Si element needs to be strictly controlled. When the mass percentage of Si element in steel is lower than 1.0%, the continuous casting blank has phase change in the hot rolling process, so that fine equiaxed crystals with uniform size are easy to form, and corrugated defects are avoided; and when the mass percentage ratio of Si element in the steel is higher than 2.0%, the magnetic induction of the steel is remarkably deteriorated without normalizing or intermediate annealing in a bell type furnace. Based on the above, in the non-oriented electrical steel sheet according to the present invention, the mass percentage ratio of Si element is controlled to be 1.0 to 2.0%.
Mn: in the non-oriented electrical steel sheet, mn element can be combined with S element to generate MnS, so that the morphology and the quantity of inclusions are controlled, and the harm to the magnetic performance of the material is effectively reduced. Therefore, it is necessary to add Mn content of 0.2% or more to ensure that the Mn element can exert the above-described advantageous effects. However, it should be noted that the mass percentage ratio of Mn element in the steel is not too high, and when the mass percentage ratio of Mn is higher than 1.0%, not only the recrystallization favorable texture of the finished steel sheet is easily damaged, but also the manufacturing cost of the steel is greatly increased. Based on the above, in the non-oriented electrical steel sheet of the present invention, the mass percentage ratio of Mn element is controlled to be 0.2 to 1.0%.
Al: in the non-oriented electrical steel sheet, the Al element can obviously improve the resistivity of the material and improve the iron loss performance of the finished steel sheet. When the content of Al element in the steel is lower than 0.2%, the iron loss is not well reduced; and when the Al content is more than 1.0%, the castability of the continuous casting molten steel is significantly deteriorated. Based on the above, the influence of the content of the Al element on the performance of the steel is comprehensively considered, and the mass percentage ratio of the Al element in the non-oriented electrical steel plate is controlled to be between 0.2 and 1.0 percent.
Ca: in the non-oriented electrical steel sheet, ca element has the effect of inhibiting columnar crystal formation, can effectively refine the grain size, and is beneficial to reducing the ratio of the grain length to the short axis size, namely promoting the formation of equiaxed crystals with uniform size. Therefore, in order for the Ca element to effectively exert the above-described advantageous effects, it is necessary to add Ca in an amount of 0.0003% or more; when the mass percentage ratio of Ca element in the steel is higher than 0.010%, the hot rolling recrystallization effect is inhibited, and the magnetic induction of the finished strip steel is deteriorated. Based on the above, in the non-oriented electrical steel sheet, the mass percentage ratio of Ca element is controlled to be between 0.0003 and 0.010 percent, and in the range, the fluidity of molten steel can be improved, and the castability of the molten steel in the continuous casting process can be improved.
Of course, in some preferred embodiments, in order to obtain a better implementation effect, the mass percentage of the Ca element may be preferably controlled to be between 0.0005 and 0.004%.
Sb: in the non-oriented electrical steel sheet according to the present invention, sb is a grain boundary segregation element capable of promoting the formation of {100} (001) advantageous texture, i.e., the formation of equiaxed grains having a uniform ratio of long and short axis dimensions. Therefore, in order to ensure that the above-described advantageous effects can be achieved by the Sb element, it is necessary to add Sb in an amount of 0.005% by mass or more. However, it should be noted that the content of Sb element in the steel should not be too high, and when the mass percentage ratio of Sb element is higher than 0.20%, the grain size of the finished steel sheet is severely refined, and the electromagnetic performance of the finished steel sheet is deteriorated. Based on the above, in the non-oriented electrical steel sheet, the mass percentage of the Sb element is controlled to be between 0.005 and 0.2 percent.
Of course, in some preferred embodiments, in order to obtain a better implementation effect, the mass percentage of the Sb element may be preferably controlled between 0.02 and 0.12.
Further, in the non-oriented electrical steel sheet according to the present invention, the core loss P thereof 15/50 Magnetic induction B is less than or equal to 3.4W/kg 50 ≥1.72T。
Accordingly, another object of the present invention is to provide a method for manufacturing the non-oriented electrical steel sheet, which is simple to operate, low in cost, environmentally friendly in cold joint and excellent in magnetism, and can realize the production of the non-oriented electrical steel sheet without corrugated defects by strictly controlling the cooling temperature of the slab during continuous casting and controlling the temperature difference of the slab in the heating furnace along the length direction. The non-oriented electrical steel plate prepared by the manufacturing method has lower iron loss and better magnetic induction, and the iron loss P thereof 15/50 Magnetic induction B is less than or equal to 3.4W/kg 50 Is more than or equal to 1.72T, and has good popularization prospect and application value.
In order to achieve the above object, the present invention provides a method for manufacturing the non-oriented electrical steel sheet, comprising the steps of:
(1) Smelting;
(2) Casting: controlling the surface temperature of the continuous casting blank at the outlet position of the continuous casting machine to be more than or equal to 780 ℃ so that the grain size ratio of the continuous casting blank in the thickness direction and the width direction is 2.5-6.0;
(3) And (3) hot rolling: after the hot rolling rough rolling is finished, controlling the difference between the head temperature and the tail temperature of the intermediate billet to be less than or equal to 25 ℃;
(4) Cold rolling;
(5) And (5) continuous annealing.
On the premise of the chemical composition design system, the manufacturing method can obtain the non-oriented electrical steel plate with good surface state and no corrugated defects through the following production flow and technical requirements. The production process flow of the non-oriented electrical steel plate can specifically comprise the following steps: a) The steelmaking process comprises the following steps: blast furnace molten iron, molten iron pretreatment, converter smelting, RH refining and continuous casting; b) The hot rolling process comprises the following steps: continuously casting blank, reheating, rough rolling, finish rolling and coiling; c) The cold rolling process comprises the following steps: hot rolling, pickling, cold rolling and coiling; d) Continuous annealing: cold rolling, pre-cleaning, continuous annealing, post-cleaning, insulating coating and finishing and leaving factory.
In the production process, the molten iron of the blast furnace is first pretreated to remove the harmful elements P, S, N, ti and the like properly, and then the molten iron of the blast furnace is introduced into a converter to be smelted, heated, decarburized, si, mn and the like are removed. After the converter smelting is finished, the carbon content of molten steel is generally between 0.02 and 0.09 percent, so that deep decarburization is needed to be carried out in RH refining according to the design requirement of the chemical composition of the invention, si and Al are adopted for composite deoxidation, and alloying is carried out according to the composition design of the steel, so that the main components Si, mn and Al, the trace elements Sb, ca and the like required by the design of the invention are achieved, and the impurity element C, S content is limited.
In the casting process of the step (2) of the manufacturing method of the present invention, the surface temperature of the continuous casting billet at the outlet position of the continuous casting machine is limited to 780 ℃ or more, and mainly when the temperature is considered to be too low, the continuous casting cooling rate is high, and the recovery effect of the microstructure in the hot rolling process is poor. In contrast, at higher surface temperature, the temperature rising rate of the continuous casting blank in the heating furnace is low, and the growth rate of coarse columnar crystals in the heat flow direction is low, so that the ratio of the grain size of the continuous casting blank in the thickness direction to the grain size in the width direction can be controlled.
Further, in the manufacturing method according to the present invention, in the step (2), the molten steel is not subjected to any form of electromagnetic stirring or electromagnetic braking during the continuous casting.
Further, in the manufacturing method of the present invention, in the step (2), the degree of superheat of the molten steel is 10 to 45 ℃ and the casting speed is 0.6 to 1.8m/min in the continuous casting process of the molten steel.
Further, in the manufacturing method of the present invention, in the step (3), rolling is performed in 4 to 6 passes in the rough rolling stage, and the first pass reduction is not less than 35% and the final pass reduction is not more than 10%.
Further, in the production method of the present invention, in the step (3), the initial rolling temperature of the rough rolling is controlled to be 1050 to 1150 ℃ and the final rolling temperature is controlled to be 650 to 950 ℃.
In the technical scheme of the invention, when the hot rolling operation of the subsequent step (3) is carried out, the furnace heating time of the continuous casting blank can be controlled to be 120-360 min, the initial rolling temperature of the continuous casting blank is 1050-1150 ℃, the hot rolling rough rolling is finished in 4-6 passes, the final rolling temperature and the coiling temperature are 650-950 ℃ and 500-850 ℃, and the thickness of the hot rolled steel plate is 1.2-2.8 mm.
At this time, in the rough rolling stage, the first pass reduction rate may be further limited to be not less than 35%, so as to effectively crush columnar crystals with a grain size ratio of 2.5-6.0 in the thickness direction to the width direction of the continuous casting billet, and when the rough rolling equipment capacity is high, the first pass reduction rate should be improved as much as possible, but generally controlled within 50%. Meanwhile, the reduction rate of the final pass is limited to be less than or equal to 10 percent so as to reduce the tissue energy storage of the intermediate billet and promote the full recrystallization of the microstructure in the finish rolling stage of hot rolling.
In order to improve the uniformity of the microstructure of the hot rolled strip steel, the difference between the head temperature and the tail temperature of the intermediate billet after the hot rolling rough rolling of the continuous casting billet is finished is less than or equal to 25 ℃. After the hot rolling is finished, hot rolled strip microstructure with sufficient recrystallization and uniform equiaxed crystal size can be obtained without any heat preservation treatment, heat treatment, or normalizing intermediate annealing treatment, or bell-type furnace intermediate annealing treatment.
Further, in the production method of the present invention, in the step (3), the winding temperature is controlled to 500 to 850 ℃.
Further, in the manufacturing method of the present invention, in the step (5), the temperature rise rate of the continuous annealing is controlled to be 50 to 800 ℃/s.
Further, in the manufacturing method of the present invention, in the step (5), the temperature rise rate of the continuous annealing is controlled to be 80 to 200 ℃/s.
In the above technical solution of the present invention, in the continuous annealing process, compared with the conventional continuous annealing of a slow heating steel plate (generally, the heating rate is lower than 30 ℃/s) using gas and/or electricity, the present invention can preferably use an electromagnetic induction heating device with a fast heating function, so as to achieve fast heating of the steel plate to a set temperature in a shorter time, and the fast heating can generally be performed from room temperature.
In the present invention, the temperature rise rate of the continuous annealing may be controlled to 50 to 800 ℃/s, but the temperature rise rate of the continuous annealing may be preferably controlled to 80 to 200 ℃/s, limited to the equipment investment cost and the energy medium consumption. By adopting the higher heating rate to heat, the energy storage size of the finished steel plate after continuous annealing can be adjusted, and sufficient driving force is provided for overcoming grain boundary resistance when the finished steel plate is recrystallized by equiaxed crystals, so that the grain size of the finished steel plate can be rapidly and uniformly grown. After the continuous annealing is finished, the surface state of the finished steel plate is good, and no corrugated defect exists on the surface of the finished steel plate.
Compared with the prior art, the non-oriented electrical steel plate with good surface state and the manufacturing method thereof have the following advantages and beneficial effects:
when the manufacturing method is adopted to produce the non-oriented electrical steel plate, the hot rolled steel plate is not subjected to any heat preservation treatment, heating treatment, or normalizing intermediate annealing treatment or bell-type furnace intermediate annealing treatment after hot rolling, and the hot rolled steel strip microstructure with full recrystallization and uniform equiaxial crystal size can be obtained.
The manufacturing method of the non-oriented electrical steel plate with good surface state is simple to operate, low in cost, environment-friendly in cold connection and excellent in magnetism, and can realize the production of the non-oriented electrical steel plate without corrugated defects by strictly controlling the cooling temperature of the plate blank during continuous casting and controlling the temperature difference of the plate blank in the heating furnace along the length direction.
The non-oriented electrical steel plate manufactured by the manufacturing method has no corrugated defect on the surface, has lower iron loss and better magnetic induction, and has iron loss P 15/50 Magnetic induction B is less than or equal to 3.4W/kg 50 Is more than or equal to 1.72T, and has very good popularization prospect and application value.
Drawings
FIG. 1 schematically shows the ratio of the Ca content to the grain size of a continuous casting slab in the thickness direction to the width direction and the magnetic induction B of a finished steel sheet 50 Is a function of (a) and (b).
Fig. 2 is a photograph of a microstructure of the non-oriented electrical steel sheet of example 3.
Fig. 3 is a microstructure photograph of the comparative steel plate of comparative example 2.
Detailed Description
The non-oriented electrical steel sheet having a good surface state and the method of manufacturing the same according to the present invention will be further explained and illustrated with reference to the accompanying drawings and specific examples, which, however, do not constitute an undue limitation on the technical solution of the present invention.
Examples 1 to 6 and comparative examples 1 to 3
The non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3 were prepared by the following steps:
(1) Smelting: after molten iron of a blast furnace is subjected to three-stripping of molten iron pretreatment, the molten iron and a proper amount of scrap steel are matched according to proportion, and are fed into a furnace, and are smelted by a top-bottom combined blown converter, deep decarburization, al and Si composite deoxidation and alloying are sequentially carried out in the RH refining process to adjust the chemical components of molten steel, and proper amounts of trace elements Sb and Ca are added to obtain the chemical element component proportions shown in table 1.
(2) Casting: and (3) arranging the molten steel to be lifted to a continuous casting machine for continuous casting after RH refining, wherein in the continuous casting process, no electromagnetic stirring or electromagnetic braking in any form is adopted, the superheat degree of the molten steel is 10-45 ℃, the casting speed is 0.6-1.8 m/min, and the surface temperature of the continuous casting blank at the outlet position of the continuous casting machine is controlled to be more than or equal to 780 ℃, so that the ratio of the grain size of the continuous casting blank in the thickness direction to the grain size in the width direction is 2.5-6.0, and the casting blank with the thickness of 170-250 mm and the width of 800-1400 mm is obtained.
(3) And (3) hot rolling: the hot rolling can comprise rough rolling and finish rolling, in the rough rolling stage, 4-6 times of rolling can be adopted, the first pass reduction rate is more than or equal to 35%, the last pass reduction rate is less than or equal to 10%, the initial rolling temperature of rough rolling is controlled to be 1050-1150 ℃, and the final rolling temperature is controlled to be 650-950 ℃; after the hot rolling rough rolling is finished, controlling the difference between the head temperature and the tail temperature of the intermediate billet to be less than or equal to 25 ℃; after the hot rolling rough rolling is finished, further finish rolling can be performed, and then the steel plate is coiled, and the coiling temperature is controlled to be 500-850 ℃.
(4) Cold rolling: and (3) pickling the hot rolled steel coil, cold rolling, coiling and cleaning.
(5) Continuous annealing: and (3) adopting continuous annealing equipment with an electromagnetic induction rapid heating device, controlling the heating rate of continuous annealing to be 50-800 ℃/s, preferably controlling the heating rate of continuous annealing to be 80-200 ℃/s, and rapidly heating the cold-rolled steel sheet.
In the present invention, the chemical composition design and the related manufacturing process of the non-oriented electrical steel sheet of examples 1-6 meet the design specification requirements of the present invention. In contrast, the comparative steel plates of comparative examples 1 to 3 all have parameters which do not meet the design specification requirements of the present invention in the chemical composition design and the related manufacturing processes.
Table 1 shows the mass percentage ratios of the respective chemical elements of the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3.
Table 1 (wt.%), balance Fe and other unavoidable impurities
| Numbering device | C | Si | Mn | Al | Ca | Sb | Si+Al |
| Example 1 | 0.0021 | 1.1 | 0.3 | 1.0 | 0.0003 | 0.08 | 2.1 |
| Example 2 | 0.0009 | 1.5 | 0.8 | 0.4 | 0.0027 | 0.005 | 1.9 |
| Example 3 | 0.0038 | 1.7 | 0.4 | 0.8 | 0.0032 | 0.06 | 2.5 |
| Example 4 | 0.0016 | 1.8 | 0.5 | 0.5 | 0.0100 | 0.20 | 2.3 |
| Example 5 | 0.0047 | 1.3 | 0.2 | 0.6 | 0.0005 | 0.020 | 1.9 |
| Example 6 | 0.0027 | 2.0 | 1.0 | 0.2 | 0.0065 | 0.016 | 2.2 |
| Comparative example 1 | 0.0039 | 2.2 | 0.6 | 0.2 | 0.0005 | 0.02 | 2.4 |
| Comparative example 2 | 0.0022 | 1.6 | 0.2 | 1.2 | 0.0120 | - | 2.8 |
| Comparative example 3 | 0.0013 | 1.2 | 0.4 | 0.5 | - | - | 1.7 |
Table 2 shows specific process parameters of the process steps in the above-described manufacturing methods for the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3.
Table 2-1.
Table 2-2.
Sampling the obtained non-oriented electrical steel plates of examples 1-6 and the comparative steel plates of comparative examples 1-3 respectively, and observing and analyzing the finished steel plates of each example and comparative example to obtain the non-oriented electrical steel plates of examples 1-6, wherein no corrugated defect exists on the surfaces of the non-oriented electrical steel plates; the surfaces of the comparative steel sheets of comparative examples 1 to 3 all had defects in the corrugated container, and specific observations are shown in Table 3 below.
Accordingly, after the observation and analysis of the example and comparative example steels, the properties of the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3 were examined to obtain the thickness, core loss and magnetic induction of each of the example and comparative example steel sheets, and the examination results of each of the example and comparative example finished steel sheets are shown in table 3, respectively.
The relevant performance test means are as follows:
iron loss detection: at 20 ℃, the magnetic measurement is carried out by adopting an Ebostein method. The size of the magnetic measurement sample is 30 multiplied by 320mm, and the weight of the sample is 0.5kg; the iron loss index was measured as an iron loss value at 1.5T and 50 Hz. Based on this, the core losses of the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3 can be obtained, respectively.
Magnetic induction detection: at 20 ℃, the magnetic measurement is carried out by adopting an Ebostein method. The size of the magnetic measurement sample is 30 multiplied by 320mm, and the weight of the sample is 0.5kg; the magnetic induction index is measured as a magnetic induction value under the conditions of 5000A/m and 50 Hz. Based on this, the magnetic inductances of the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3 can be obtained, respectively.
Table 3 shows the results of the observation analysis and the results of the performance test of the non-oriented electrical steel sheets of examples 1 to 6 and the comparative steel sheets of comparative examples 1 to 3.
Table 3.
As shown in Table 3 above, in the present invention, the non-oriented electrical steel sheets of examples 1 to 6 have more excellent properties than the comparative steels of comparative examples 1 to 3, which not only do not have corrugated defects, but also have lower core loss and excellent electromagnetic properties, and the core loss P of the non-oriented electrical steel sheets of examples 1 to 6 15/50 Are all less than or equal to 3.40W/kg and are between 3.05 and 3.40W/kg; magnetic induction B 50 Are all more than or equal to 1.724T and are between 1.724 and 1.738T.
In the comparative example 1 according to the present invention, the content of Si element in the comparative steel of comparative example 1 is 2.2% exceeding the upper limit of the design of the present invention by 2.0%; the outlet temperature of the continuous casting billet in the continuous casting machine is only 680 ℃ which is lower than the lower limit 780 ℃ designed by the invention; the reduction rate of the hot rolling rough rolling final pass is 50 percent and exceeds the upper limit of the design requirement of the invention by 10 percent; and the cold-rolled steel sheet is annealed at a conventional heating rate of 15 ℃/s during continuous annealing. Accordingly, the finished steel plate of comparative example 1 obtained by this technical scheme has poor electromagnetic properties and iron loss P 15/50 Reaching 3.89W/kg and magnetic induction B 50 Reaching 1.685T, the surface of the finished steel plate has serious corrugated defects.
Accordingly, in comparative examples 2 and 3 according to the present invention, one or more of the components and the production process thereof do not satisfy the design requirements of the present invention. Likewise, the finished steel plates of comparative example 2 and comparative example 3 were inferior in electromagnetic properties, and the surfaces of the finished steel plates produced by the two were subject to severe corrugated defects.
FIG. 1 schematically shows the ratio of the Ca content to the grain size of a continuous casting slab in the thickness direction to the width direction and the magnetic induction B of a finished steel sheet 50 Is a function of (a) and (b).
As shown in fig. 1, a curve a shows a relationship between the Ca content and the magnetic induction B50 of the finished steel sheet, and a curve B shows a relationship between the Ca element content and the ratio of the grain size of the continuous casting slab in the thickness direction and the grain size in the width direction. For curve a, it can be seen that at calcium levels below 0.003%, the magnetic induction would be below 1.72T. Whereas after the calcium content is higher than 0.01%, the magnetic induction is rapidly deteriorated and is again lower than 1.72T. For curve B, when the calcium content is less than 0.003%, the ratio of the grain size of the continuous casting slab in the thickness direction to that in the width direction thereof will be less than 2.5; as the calcium content increases, the ratio of the grain size of the continuous casting billet in the thickness direction to the grain size in the width direction tends to increase by oscillation; and at a calcium content higher than 0.010%, the ratio of the grain size of a part of the sample continuous casting slab in the thickness direction to that in the width direction thereof may be higher than 6.0.
The technical scheme is that an Olymbus optical microscope is adopted to measure the grain size, and metallographic microstructures along the rolling direction and perpendicular to the rolling direction are respectively observed in a summarizing way in the measuring process. The analysis and statistics of the grain size adopt an area method, and the statistics are the average size and the distribution thereof.
Fig. 2 is a photograph of a microstructure of the non-oriented electrical steel sheet of example 3.
As shown in fig. 2, in the present embodiment, the microstructure of the non-oriented electrical steel sheet of example 3 was completely recrystallized, and relatively uniform equiaxed grains were formed, and the grain size was coarse and developed.
FIG. 3 is a photograph of microstructure of a comparative steel plate of comparative example 3.
As shown in fig. 3, in the non-oriented electrical steel sheet of comparative example 2, the microstructure was not completely recrystallized, and a large proportion of the ribbon-like fibrous structure was present between the recrystallized grains, resulting in a lower recrystallization occurrence rate and a low degree of symmetry between the grain sizes.
In summary, the method for manufacturing the non-oriented electrical steel sheet with good surface state has the advantages of simple operation, low cost, environment-friendly cold receiving and excellent magnetism, and can realize the production of the non-oriented electrical steel sheet without corrugated defects by strictly controlling the cooling temperature of the slab during continuous casting and controlling the temperature difference of the slab in the heating furnace along the length direction.
The non-oriented electrical steel sheet prepared by the method of the invention has no corrugated defect, has lower iron loss and better magnetic induction, and has iron loss P 15/50 Magnetic induction B is less than or equal to 3.4W/kg 50 Is more than or equal to 1.72T, and has very good popularization prospect and application value.
It should be noted that the prior art part in the protection scope of the present invention is not limited to the embodiments set forth in the present application, and all prior art that does not contradict the scheme of the present invention, including but not limited to the prior patent document, the prior publication, the prior disclosure, the use, etc., can be included in the protection scope of the present invention.
In addition, the combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
It should also be noted that the above-recited embodiments are merely specific examples of the present invention. It is apparent that the present invention is not limited to the above embodiments, and similar changes or modifications will be apparent to those skilled in the art from the present disclosure, and it is intended to be within the scope of the present invention.
Claims (11)
1. The non-oriented electrical steel plate with good surface state is characterized by comprising the following chemical elements in percentage by mass:
c is more than 0 and less than or equal to 0.005 percent, si:1.0 to 2.0 percent, mn:0.2 to 1.0 percent, al:0.2 to 1.0 percent, ca:0.0003 to 0.010 percent, sb: 0.005-0.2%; the balance of Fe and other unavoidable impurities; wherein Si+Al:1.4 to 2.6 percent;
the non-oriented electrical steel sheet is in a casting step: controlling the surface temperature of the continuous casting blank at the outlet position of the continuous casting machine to be more than or equal to 780 ℃ so that the grain size ratio of the continuous casting blank in the thickness direction and the width direction is 2.5-6.0;
in the hot rolling step: after the hot rolling rough rolling is finished, controlling the difference between the head temperature and the tail temperature of the intermediate billet to be less than or equal to 25 ℃.
2. The non-oriented electrical steel sheet according to claim 1, wherein the mass percentage of each chemical element further satisfies at least one of the following:
Ca：0.0005～0.004％；
Sb：0.02～0.12％。
3. the non-oriented electrical steel sheet according to claim 1, wherein the steel sheet has an iron loss P 15/50 Magnetic induction B is less than or equal to 3.4W/kg 50 ≥1.72T。
4. The method for manufacturing non-oriented electrical steel sheet according to any one of claims 1 to 3, comprising the steps of:
(1) Smelting;
(2) Casting: controlling the surface temperature of the continuous casting blank at the outlet position of the continuous casting machine to be more than or equal to 780 ℃ so that the grain size ratio of the continuous casting blank in the thickness direction and the width direction is 2.5-6.0;
(3) And (3) hot rolling: after the hot rolling rough rolling is finished, controlling the difference between the head temperature and the tail temperature of the intermediate billet to be less than or equal to 25 ℃;
(4) Cold rolling;
(5) And (5) continuous annealing.
5. The method of manufacturing according to claim 4, wherein in step (2), the molten steel is not subjected to any form of electromagnetic stirring or electromagnetic braking during continuous casting.
6. The method according to claim 4, wherein in the step (2), the degree of superheat of the molten steel is 10 to 45 ℃ and the casting speed is 0.6 to 1.8m/min during the continuous casting of the molten steel.
7. The method according to claim 4, wherein in the step (3), the rolling is performed in 4 to 6 passes in the rough rolling stage, and the initial rolling reduction is not less than 35% and the final rolling reduction is not more than 10%.
8. The method according to claim 4, wherein in the step (3), the initial rolling temperature of the rough rolling is controlled to be 1050 to 1150 ℃ and the final rolling temperature is controlled to be 650 to 950 ℃.
9. The method according to claim 5, wherein in the step (3), the winding temperature is controlled to 500 to 850 ℃.
10. The method according to claim 4, wherein in the step (5), the temperature rise rate of the continuous annealing is controlled to be 50 to 800 ℃/s.
11. The method according to claim 10, wherein in the step (5), the temperature rise rate of the continuous annealing is controlled to be 80 to 200 ℃/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110908763.6A CN115704073B (en) | 2021-08-09 | 2021-08-09 | Non-oriented electrical steel plate with good surface state and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110908763.6A CN115704073B (en) | 2021-08-09 | 2021-08-09 | Non-oriented electrical steel plate with good surface state and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115704073A CN115704073A (en) | 2023-02-17 |
| CN115704073B true CN115704073B (en) | 2024-01-09 |
Family
ID=85179257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110908763.6A Active CN115704073B (en) | 2021-08-09 | 2021-08-09 | Non-oriented electrical steel plate with good surface state and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115704073B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102443734A (en) * | 2010-09-30 | 2012-05-09 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate without corrugated defect and its manufacturing method |
| CN104073714A (en) * | 2013-03-28 | 2014-10-01 | 宝山钢铁股份有限公司 | Good-surface high magnetic strength low iron loss orientation-free electrical steel plate and preparation method thereof |
| CN104789862A (en) * | 2015-03-20 | 2015-07-22 | 宝山钢铁股份有限公司 | High-magnetic-induction low-iron-loss non-oriented electrical steel plate with good surface state and manufacturing method thereof |
| CN112143964A (en) * | 2019-06-28 | 2020-12-29 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with extremely low iron loss and continuous annealing process thereof |
| CN112143963A (en) * | 2019-06-28 | 2020-12-29 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with excellent magnetic property and continuous annealing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305748A (en) * | 2012-03-15 | 2013-09-18 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate and manufacturing method thereof |
-
2021
- 2021-08-09 CN CN202110908763.6A patent/CN115704073B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102443734A (en) * | 2010-09-30 | 2012-05-09 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate without corrugated defect and its manufacturing method |
| CN104073714A (en) * | 2013-03-28 | 2014-10-01 | 宝山钢铁股份有限公司 | Good-surface high magnetic strength low iron loss orientation-free electrical steel plate and preparation method thereof |
| CN104789862A (en) * | 2015-03-20 | 2015-07-22 | 宝山钢铁股份有限公司 | High-magnetic-induction low-iron-loss non-oriented electrical steel plate with good surface state and manufacturing method thereof |
| CN112143964A (en) * | 2019-06-28 | 2020-12-29 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with extremely low iron loss and continuous annealing process thereof |
| CN112143963A (en) * | 2019-06-28 | 2020-12-29 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate with excellent magnetic property and continuous annealing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115704073A (en) | 2023-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022127104A1 (en) | High-grade non-oriented silicon steel and production method therefor | |
| CN103695619B (en) | A kind of manufacture method of high magnetic strength common orientation silicon steel | |
| CN103266266B (en) | Low-grade non-oriented silicon steel produced in continuous casting and rolling processes of sheet billet and preparation method thereof | |
| CN103074546B (en) | Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof | |
| EP3719160B1 (en) | Non-oriented electrical steel sheet with excellent magnetism and manufacturing method therefor | |
| CN101139681A (en) | High grade cold rolling non-oriented silicon steel and method for manufacturing same | |
| WO2021037061A1 (en) | 600mpa grade non-oriented electrical steel sheet and manufacturing method thereof | |
| CN103305748A (en) | Non-oriented electrical steel plate and manufacturing method thereof | |
| CN108611563A (en) | A kind of CSP flows excellent formability energy mild steel steel plate and its manufacturing method | |
| CN110317995A (en) | A method of with carbon hot rolled steel plate in the CSP production good thin gauge of surface quality | |
| CN111748740A (en) | Non-oriented silicon steel free of corrugated defects and excellent in magnetism and production method thereof | |
| CN103484764B (en) | Ti precipitation strength type superhigh-strength hot rolls thin plate and production method thereof | |
| CN108277429B (en) | Production method of high-silicon electrical steel | |
| CN107164693B (en) | A kind of preparation method based on the high silicon steel cold-strip steel of thin strap continuous casting | |
| WO2021037064A1 (en) | Cu-containing non-oriented electrical steel sheet and manufacturing method therefor | |
| CN107541663B (en) | A kind of beverage can ferrostan and its production method | |
| CN110079733B (en) | Ultra-thin ultra-high strength medium carbon bainite steel and manufacturing method thereof | |
| CN102676913B (en) | Cold-rolled steel strip for flux-cored wire and production method of cold-rolled steel strip | |
| CN110640104B (en) | Non-oriented electrical steel plate with excellent magnetic property and manufacturing method thereof | |
| CN113981307A (en) | Non-oriented electrical steel plate with high magnetic induction and low iron loss and manufacturing method thereof | |
| CN109182907B (en) | Method for producing semi-process non-oriented electrical steel by endless rolling | |
| CN115704073B (en) | Non-oriented electrical steel plate with good surface state and manufacturing method thereof | |
| CN109457099B (en) | Process method for improving electromagnetic performance of common oriented silicon steel | |
| CN107326282B (en) | 600MPa grades of high-yield-ratio hot rolling high-strength light steel and its manufacturing method | |
| CN115198203B (en) | Non-oriented electrical steel plate free of normalizing intermediate annealing and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |