CN108374130B - Non-oriented silicon steel and method for producing non-oriented silicon steel by thin slab continuous casting and rolling process - Google Patents
Non-oriented silicon steel and method for producing non-oriented silicon steel by thin slab continuous casting and rolling process Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
- C21D8/1211—Rapid solidification; Thin strip casting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Abstract
The invention discloses non-oriented silicon steel and a method for producing the non-oriented silicon steel by a thin slab continuous casting and rolling process, and relates to the non-oriented silicon steel and the production method thereof. The invention comprises the following steps: step A: smelting; and B: continuous casting; and C: heating; step D: hot continuous rolling; step E: acid washing; step F: cold rolling; step G: and (5) recrystallization annealing. The invention utilizes the thin slab continuous casting and rolling process to produce the qualified high-grade non-oriented silicon steel.
Description
Technical Field
The invention relates to non-oriented silicon steel and a production method thereof, in particular to a method for producing high-grade high-efficiency non-oriented silicon steel by using an unoriented silicon steel and a thin slab continuous casting and rolling process.
Background
The process for producing non-oriented silicon steel by the thin slab continuous casting and rolling process is disclosed at present, for example, in patent publication numbers: CN 102134675 a, patent publication No.: CN 101906577 a and patent publication No.: CN 103088253 a, and the like, which is basically a production method of low-grade or medium-grade non-oriented silicon steel.
The existing process for producing the low-grade non-oriented silicon steel by the thin slab continuous casting and rolling is basically mature, but for the high-grade non-oriented silicon steel, particularly when the silicon content is more than 2.5%, the traditional thick slab process is adopted for production, because the thin slab continuous casting and rolling process has the process characteristics of high continuous casting cooling speed, no electromagnetic stirring and the like, the continuous casting slab has less equiaxial crystals, and in addition, the hot rolling process does not have the process characteristics of crushing columnar crystals under high pressure of the traditional thick slab process rough rolling pass, the hot rolling banded structure is serious, corrugated defects are easy to occur, the magnetic performance and the surface quality of a finished product are influenced, and the process for producing the high-grade non-oriented silicon steel by the thin slab continuous casting and rolling process is not disclosed at present.
In conclusion, how to utilize the thin slab continuous casting and rolling process to produce high-grade non-oriented silicon steel so as to fully exert the advantages of the thin slab continuous casting and rolling process is a technical problem to be solved urgently in the prior art.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defect that the existing thin slab continuous casting and rolling process is difficult to produce qualified high-grade non-oriented silicon steel, and provides non-oriented silicon steel and a method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the non-oriented silicon steel comprises the following chemical components in percentage by mass:
si: 2.5-3.5%, Al: 0.10 to 1.5%, Mn: 0.10-1.5%, S + O + C + N + Ti is less than or equal to 80ppm, rare earth elements (La and/or Ce and/or Nd): 0.001-0.01%, and the balance of Fe and other impurity elements.
The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process comprises the following steps:
step A: smelting;
and B: continuous casting;
and C: heating;
step D: hot continuous rolling;
step E: acid washing;
step F: cold rolling;
step G: and (5) recrystallization annealing.
As a further improvement of the invention, in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the final chemical components of the treated molten steel in percentage by mass are as follows:
si: 2.5-3.5%, Al: 0.10 to 1.5%, Mn: 0.10-1.5%, S + O + C + N + Ti is less than or equal to 80ppm, rare earth elements (La and/or Ce and/or Nd): 0.001-0.01% of Fe and other impurity elements in balance;
and adding the rare earth elements within 1-2 minutes after the RH refining alloying is finished, and stirring for more than or equal to 3 minutes after the rare earth elements are added.
As a further improvement of the method, in the step B, in the continuous casting process, the drawing speed is controlled to be 2.8-4.6 m/min, and a casting blank with the thickness of 30-70 mm is obtained by continuous casting.
As a further improvement of the method, in the heating process in the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank is more than 800 ℃, the heating temperature is 950-1150 ℃, and the soaking time is less than 30 minutes.
As a further improvement of the invention, in the step D, the hot continuous rolling of 7 stands is carried out, the initial rolling temperature is controlled to be 950-1100 ℃, the final rolling temperature is controlled to be 900-920 ℃, the coiling temperature is controlled to be 600-700 ℃, and the target thickness of the hot rolled plate is controlled to be 0.8-1.0 mm.
As a further improvement of the invention, in the step F cold rolling process, the cold rolling is carried out until the thickness is 0.5 mm.
As a further improvement of the invention, in the recrystallization annealing process in the step G, the annealing temperature is controlled to be 1000-1200 ℃, and the heat preservation time is controlled to be 1-3 minutes.
As a further improvement of the invention, in the continuous casting process of the step B, the superheat degree of the tundish is controlled to be less than or equal to 0 ℃, and the isometric crystal rate is ensured to be more than or equal to 80 percent; step D, controlling the reduction rate of the last pass of the hot continuous rolling process to be more than 50 percent; and F, controlling the reduction rate to be less than or equal to 50% in the cold rolling process.
As a further improvement of the invention, the step F cold rolling process adopts a single-stand reversible cold rolling mill or a cold continuous rolling mill; and G, adopting a pure hydrogen atmosphere in the recrystallization annealing process.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the process of the existing thin slab continuous casting and rolling production of low-grade non-oriented silicon steel is basically mature, but for high-grade non-oriented silicon steel, especially when the silicon content is more than 2.5%, obvious product defects exist, and aiming at the problems, the method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process disclosed by the invention has the advantages that the process parameters from the step A to the step G are mutually matched, and the qualified high-grade non-oriented silicon steel is produced by the thin slab continuous casting and rolling process, so that the advantages of the thin slab continuous rolling process are fully exerted.
(2) The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process of the invention reasonably sets the components and the process on the thin slab continuous casting and rolling process, produces the high-grade high-efficiency non-oriented silicon steel with silicon content more than 2.5 percent under the conditions of no electromagnetic stirring and no normalizing process, has high magnetic induction and low iron loss of the final product, solves the problem of corrugated defects easily occurring in the high-grade non-oriented silicon steel produced by the existing thin slab continuous casting and rolling process, and has the main technical characteristics that: requiring that [ S + O + C + N + Ti ] in the molten steel is less than or equal to 80ppm and ultra-pure molten steel; rare earth elements are added, so that firstly, molten steel is deeply purified, inclusions are reduced, and magnetic performance is improved, and secondly, rare earth sulfide is used as nucleation particles to refine columnar crystals of casting blanks and eliminate corrugations; the casting process adopts negative superheat degree, so that the equiaxial crystal rate is more than 80 percent, and corrugation is eliminated; the reduction rate of the last pass in the hot continuous rolling process is controlled to be more than 50%, and the banded structure of the core part of the hot rolled plate is reduced, the hot rolled structure is improved and the corrugation is eliminated under low-temperature large reduction; the thickness of a hot rolled plate is optimized, the reduction rate in the cold rolling process is controlled to be less than or equal to 50%, the medium reduction rate is controlled, the (111) texture is reduced, the (100) texture is increased, and the magnetic performance is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of a method for producing non-oriented silicon steel through a thin slab continuous casting and rolling process according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the method for producing non-oriented silicon steel through the thin slab continuous casting and rolling process of the present invention comprises the following steps:
step A: smelting;
in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the treated molten steel comprises the following chemical components in percentage by mass:
si: 2.5-3.5%, Al: 0.10 to 1.5%, Mn: 0.10-1.5%, S + O + C + N + Ti is less than or equal to 80ppm, rare earth elements (La and/or Ce and/or Nd): 0.001-0.01% of Fe and other impurity elements in balance;
adding the rare earth element within 1-2 minutes after the RH refining alloying is finished, and stirring for more than or equal to 3 minutes after the rare earth element is added;
and B: continuous casting;
in the continuous casting process of the step B, the drawing speed is controlled to be 2.8-4.6 m/min, and a casting blank with the thickness of 30-70 mm is obtained through continuous casting; wherein, the superheat degree of the tundish is controlled to be less than or equal to 0 ℃, and the isometric crystal rate is ensured to be more than or equal to 80 percent;
and C: heating;
c, in the heating process of the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank in the furnace is more than 800 ℃, the heating temperature is 950-1150 ℃, and the soaking time is less than 30 minutes;
step D: hot continuous rolling;
step D, in the hot continuous rolling process, performing 7-frame hot continuous rolling, controlling the initial rolling temperature to 950-1100 ℃, controlling the final rolling temperature to 900-920 ℃, controlling the coiling temperature to 600-700 ℃, and controlling the target thickness of the hot rolled plate to be 0.8-1.0 mm; wherein, the rolling reduction of the last pass in the hot continuous rolling process in the step D is controlled to be more than 50 percent;
step E: acid washing;
step F: cold rolling;
step F, in the cold rolling process, cold rolling to the thickness of 0.5 mm; wherein, the rolling reduction rate is controlled to be less than or equal to 50% in the cold rolling process, and a single-stand reversible cold rolling mill or a cold continuous rolling mill is adopted;
step G: and (5) recrystallization annealing.
And G, in the recrystallization annealing process, controlling the annealing temperature to be 1000-1200 ℃, controlling the heat preservation time to be 1-3 minutes, and adopting a pure hydrogen atmosphere.
The process of the existing thin slab continuous casting and rolling production of low-grade non-oriented silicon steel is basically mature, but for high-grade non-oriented silicon steel, especially when the silicon content is more than 2.5%, obvious product defects exist, and aiming at the problems, the method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process disclosed by the invention has the advantages that the process parameters from the step A to the step G are mutually matched, and the qualified high-grade non-oriented silicon steel is produced by the thin slab continuous casting and rolling process, so that the advantages of the thin slab continuous rolling process are fully exerted.
The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process of the invention reasonably sets the components and the process on the thin slab continuous casting and rolling process, produces the high-grade high-efficiency non-oriented silicon steel with silicon content more than 2.5 percent under the conditions of no electromagnetic stirring and no normalizing process, has high magnetic induction and low iron loss of the final product, solves the problem of corrugated defects easily occurring in the high-grade non-oriented silicon steel produced by the existing thin slab continuous casting and rolling process, and has the main technical characteristics that: requiring that [ S + O + C + N + Ti ] in the molten steel is less than or equal to 80ppm and ultra-pure molten steel; rare earth elements are added, so that firstly, molten steel is deeply purified, inclusions are reduced, and magnetic performance is improved, and secondly, rare earth sulfide is used as nucleation particles to refine columnar crystals of casting blanks and eliminate corrugations; the casting process adopts negative superheat degree, so that the equiaxial crystal rate is more than 80 percent, and corrugation is eliminated; the reduction rate of the last pass in the hot continuous rolling process is controlled to be more than 50%, and the banded structure of the core part of the hot rolled plate is reduced, the hot rolled structure is improved and the corrugation is eliminated under low-temperature large reduction; the thickness of a hot rolled plate is optimized, the reduction rate in the cold rolling process is controlled to be less than or equal to 50%, the medium reduction rate is controlled, the (111) texture is reduced, the (100) texture is increased, and the magnetic performance is improved.
For a further understanding of the contents of the present invention, reference will now be made in detail to the following examples.
Example 1
The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process comprises the following steps:
step A: smelting;
in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the treated molten steel comprises the following chemical components in percentage by mass:
si: 2.5%, Al: 1.5%, Mn: 1.5%, [ S + O + C + N + Ti ]: 76ppm, La: 0.005% and the balance of Fe and other impurity elements;
adding the rare earth elements after finishing RH refining alloying for 1 minute, stirring for 3 minutes after adding the rare earth elements;
and B: continuous casting;
in the continuous casting process of the step B, the drawing speed is controlled to be 4.6 m/min, and a casting blank with the thickness of 70mm is obtained through continuous casting; wherein, the superheat degree of the tundish is controlled to be-5 ℃, and the isometric crystal rate is 90 percent;
and C: heating;
c, in the heating process of the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank entering the furnace is 820 ℃, the heating temperature is 1000 ℃, and the soaking time is 25 minutes;
step D: hot continuous rolling;
d, in the hot continuous rolling process, performing 7-frame hot continuous rolling, controlling the initial rolling temperature to be 1000 ℃, the final rolling temperature to be 900 ℃, the coiling temperature to be 600 ℃ and the target thickness of the hot rolled plate to be 1.0 mm; wherein, the rolling reduction of the last pass in the hot continuous rolling process in the step D is 55 percent;
step E: acid washing;
step F: cold rolling;
step F, in the cold rolling process, cold rolling to the thickness of 0.5 mm; wherein, the rolling reduction is controlled to be 50% in the cold rolling process, and a single-stand reversible cold rolling mill or a cold continuous rolling mill is adopted;
step G: and (5) recrystallization annealing.
And G, in the recrystallization annealing process, controlling the annealing temperature to be 1000 ℃, controlling the heat preservation time to be 1 minute and adopting a pure hydrogen atmosphere.
Example 2
The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process comprises the following steps:
step A: smelting;
in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the treated molten steel comprises the following chemical components in percentage by mass:
si: 3.0%, Al: 1.0%, Mn: 1.0%, [ S + O + C + N + Ti ]: 70ppm, (La + Ce): 0.008% and the balance of Fe and other impurity elements;
adding the rare earth element 2 minutes after the RH refining alloying is finished, and stirring for 4 minutes after the rare earth element is added;
and B: continuous casting;
in the continuous casting process of the step B, the drawing speed is controlled to be 3.5 m/min, and a casting blank with the thickness of 50mm is obtained through continuous casting; wherein, the superheat degree of the tundish is controlled to be-5 ℃, and the isometric crystal rate is 85 percent;
and C: heating;
c, in the heating process of the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank in the furnace is 850 ℃, the heating temperature is 1100 ℃, and the soaking time is 25 minutes;
step D: hot continuous rolling;
d, in the hot continuous rolling process, performing 7-frame hot continuous rolling, wherein the initial rolling temperature is controlled to 1080 ℃, the final rolling temperature is controlled to 920 ℃, the coiling temperature is controlled to 650 ℃, and the target thickness of the hot rolled plate is controlled to be 0.9 mm; wherein, the reduction rate of the last pass of the hot continuous rolling process in the step D is 60 percent;
step E: acid washing;
step F: cold rolling;
step F, in the cold rolling process, cold rolling to the thickness of 0.5 mm; wherein, the rolling reduction is controlled to be 44.44% in the cold rolling process, and a single-stand reversible cold rolling mill or a cold continuous rolling mill is adopted;
step G: and (5) recrystallization annealing.
And G, in the recrystallization annealing process, controlling the annealing temperature to be 1100 ℃, controlling the heat preservation time to be 2 minutes, and adopting a pure hydrogen atmosphere.
Example 3
The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process comprises the following steps:
step A: smelting;
in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the treated molten steel comprises the following chemical components in percentage by mass:
si: 3.5%, Al: 0.10%, Mn: 0.10%, [ S + O + C + N + Ti ]: 67ppm, rare earth element (La + Ce + Nd): 0.01 percent, and the balance of Fe and other impurity elements;
adding the rare earth element 2 minutes after the RH refining alloying is finished, and stirring for 4 minutes after the rare earth element is added;
and B: continuous casting;
in the continuous casting process of the step B, the drawing speed is controlled to be 2.8 m/min, and a casting blank with the thickness of 30mm is obtained through continuous casting; wherein, the superheat degree of the tundish is controlled to be-6 ℃, and the isometric crystal rate is 80 percent;
and C: heating;
c, in the heating process of the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank entering the furnace is 820 ℃, the heating temperature is 1150 ℃, and the soaking time is 25 minutes;
step D: hot continuous rolling;
d, in the hot continuous rolling process, performing 7-frame hot continuous rolling, controlling the initial rolling temperature to be 1100 ℃, controlling the final rolling temperature to be 920 ℃, controlling the coiling temperature to be 700 ℃, and controlling the target thickness of the hot rolled plate to be 0.8 mm; wherein, the reduction rate of the last pass of the hot continuous rolling process in the step D is controlled to be 65 percent;
step E: acid washing;
step F: cold rolling;
step F, in the cold rolling process, cold rolling to the thickness of 0.5 mm; wherein, the rolling reduction is controlled to be 37.5% in the cold rolling process, and a single-stand reversible cold rolling mill or a cold continuous rolling mill is adopted;
step G: and (5) recrystallization annealing.
And G, in the recrystallization annealing process, controlling the annealing temperature to be 1200 ℃, controlling the heat preservation time to be 3 minutes, and adopting a pure hydrogen atmosphere.
The magnetic properties of the non-oriented silicon steel produced in the specific examples 1 to 3 are shown in the following table 1, and the non-oriented electrical steel finished products produced in the examples 1 to 3 have no corrugated defects on the surface and good surface quality.
TABLE 1 magnetic Properties
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. The method for producing the non-oriented silicon steel by the thin slab continuous casting and rolling process is characterized by comprising the following steps of: the production method is an unoriented treatment process and specifically comprises the following steps:
step A: smelting;
in the smelting process of the step A, firstly, converter smelting is carried out, then RH refining treatment is carried out, and the treated molten steel comprises the following chemical components in percentage by mass:
si: 2.5-3.5%, Al: 0.10 to 1.5%, Mn: 0.10-1.5%, S + O + C + N + Ti is less than or equal to 80ppm, rare earth elements (La and/or Ce and/or Nd): 0.001-0.01% of Fe and other impurity elements in balance;
adding the rare earth element within 1-2 minutes after the RH refining alloying is finished, and stirring for more than or equal to 3 minutes after the rare earth element is added;
and B: continuous casting;
in the continuous casting process of the step B, the drawing speed is controlled to be 2.8-4.6 m/min, and a casting blank with the thickness of 30-70 mm is obtained through continuous casting;
in the continuous casting process of the step B, controlling the superheat degree of the tundish to be less than or equal to 0 ℃ and ensuring that the isometric crystal rate is more than or equal to 80 percent;
and C: heating;
c, in the heating process of the step C, the casting blank is sent into a tunnel furnace to be heated, the temperature of the casting blank in the furnace is more than 800 ℃, the heating temperature is 950-1150 ℃, and the soaking time is less than 30 minutes;
step D: hot continuous rolling;
step D, in the hot continuous rolling process, performing 7-frame hot continuous rolling, controlling the initial rolling temperature to 950-1100 ℃, controlling the final rolling temperature to 900-920 ℃, controlling the coiling temperature to 600-700 ℃, and controlling the target thickness of the hot rolled plate to be 0.8-1.0 mm;
step D, controlling the reduction rate of the last pass of the hot continuous rolling process to be more than 50 percent; step E: acid washing;
step F: cold rolling;
step F, in the cold rolling process, cold rolling to the thickness of 0.5 mm;
step F, controlling the reduction rate to be less than or equal to 50% in the cold rolling process;
step G: recrystallization annealing;
and G, in the recrystallization annealing process, controlling the annealing temperature to be 1000-1200 ℃ and controlling the heat preservation time to be 1-3 minutes.
2. The method for producing non-oriented silicon steel by the thin slab continuous casting and rolling process according to claim 1, wherein the method comprises the following steps: step F, adopting a single-stand reversible cold rolling mill or a cold continuous rolling mill in the cold rolling process; and G, adopting a pure hydrogen atmosphere in the recrystallization annealing process.
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|---|---|---|---|---|
| CN102418034A (en) * | 2011-12-14 | 2012-04-18 | 武汉钢铁(集团)公司 | Production method for high-grade non-oriented silicon steel |
| CN102851577A (en) * | 2012-08-28 | 2013-01-02 | 武汉钢铁(集团)公司 | High grade non-oriented silicon steel produced by continuous casting and rolling of sheet billet and production method thereof |
| KR20150074861A (en) * | 2013-12-24 | 2015-07-02 | 주식회사 포스코 | Non-oriented electrical steel steet and manufacturing method for the same |
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