CN111155023A - Preparation method of high-toughness high-strength non-oriented high-silicon steel - Google Patents
Preparation method of high-toughness high-strength non-oriented high-silicon steel Download PDFInfo
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Abstract
The invention discloses a preparation method of high-toughness high-strength non-oriented high-silicon steel, which comprises the following process flows of: vacuum smelting, ten-roller hot rolling, normalizing, high-temperature heat treatment, cooling and water quenching, low-temperature annealing, acid washing and coating. According to the invention, the components are improved after the trace alloying element Cu and the rare earth element are added into the raw materials, ten-roller hot rolling is adopted to prepare the thin strip, and the high-silicon steel with obviously improved toughness and strength is prepared through a unique subsequent heat treatment process.
Description
Technical Field
The invention relates to a preparation method of silicon steel, in particular to a preparation method of high silicon steel, which is applied to the technical field of electrical steel manufacturing.
Background
The electrical steel plays a very important role in the power, electronic and military industries, and the silicon iron soft magnetic alloy with very low carbon content is added with silicon for the purpose of improving the resistivity of the electrical steel, reducing the iron loss and reducing the magnetocrystalline anisotropy. It is mainly used for manufacturing iron cores of various motors and transformers, and occupies the largest proportion in magnetic materials. Plays a role as a medium for mutual conversion between magnetic energy and electric energy in human daily life. It is the most important metal functional material for power, electronic, communication, aviation and military industries to save energy, and plays the role of a medium for electromagnetic conversion.
According to statistics, the energy loss caused by the heat of the silicon steel chips accounts for 2.5-6% of the total energy of the power each year in each country. In the aspect of manufacturing motors and transformers, the silicon steel sheet accounts for 90-95% of the soft magnetic material by weight and is the soft magnetic alloy with the largest use amount. Therefore, the method has important significance in saving energy and researching and developing the silicon steel with more excellent performance to replace the common silicon steel. When the silicon content is 6.5%, compared with common silicon steel, the magnetic performance is more excellent, and the magnetic hysteresis expansion coefficient is close to zero, the iron loss is low, the magnetic conductivity and the resistivity are high, and the like; particularly, under the condition of a high-frequency area, the high-silicon steel has remarkable advantages in the aspects of improving energy conversion, reducing noise pollution and the like. However, as the silicon content increases, the room temperature tissue has an ordered phase, the hardness and the brittleness of the room temperature tissue rapidly increase, and the high-silicon steel is difficult to process in a conventional rolling mode, so that the wide application of the high-silicon steel is limited.
The 6.5 wt% Si high silicon steel currently used in China mostly depends on import. Therefore, research and development of a high-silicon steel preparation and processing method with short flow and high efficiency are key points for expanding the application of the alloy and how to improve the mechanical property of the high-silicon steel, and become a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to overcome the defects in the prior art and provide the preparation method of the high-toughness high-strength non-oriented high-silicon steel.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
a preparation method of high-toughness high-strength non-oriented high-silicon steel comprises the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6-7%, Cu: 0.5-1%, rare earth element lanthanum (La) or cerium (Ce): 0.2-0.5%, and the balance of Fe and inevitable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1400-1600 ℃, and the time of the refining process is at least 30min to obtain high-silicon steel liquid;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 75-95% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.2-0.5 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 900-950 ℃, and controlling the normalizing heat treatment time to be 10-15 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is not higher than 10 ℃/min, the heat preservation temperature is not lower than 850 ℃, and the heat preservation time is 1-2 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 670-690 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 200-300 ℃ and the tempering time to be 0.5-1 h, and after the tempering heat treatment is finished, continuously cooling the high-silicon steel plate to room temperature along with the furnace in the inert atmosphere;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
As a preferable technical scheme of the invention, in the step a, when the vacuum smelting process is carried out, the refining time is controlled to be 0.5-1 h.
As a preferred technical scheme of the invention, in the step a, before the vacuum smelting process is carried out, vacuum is pumped to be not higher than 10-4Pa ensures the anaerobic environment, and the purity of the inert protective atmosphere is not less than 99.999 percent.
In the step a, the preferable technical scheme of the invention is that the raw materials comprise the following components in parts by weight: si: 6.4-6.6%, Cu: 0.5-0.9%, rare earth elements: 0.2-0.5%, and the balance of Fe and inevitable impurities.
In the step a, the rare earth element in the raw material is lanthanum (La) and cerium (Ce), or a mixed rare earth element of lanthanum (La) and cerium (Ce).
In the step b, the hot rolling process is performed, and the total reduction amount is controlled to be 80-90% to prepare the hot-rolled high-silicon steel sheet.
In the step c, the normalizing heat treatment is preferably performed at 900 to 940 ℃.
In the preferred technical scheme of the invention, in the step d, the heat preservation time is 1-1.8 h when the high-temperature heat treatment is carried out.
As a preferable technical scheme of the invention, in the step e, when water quenching heat treatment is performed, the high-silicon steel plate is firstly cooled to 670-680 ℃ along with the furnace, and then water quenching treatment is performed.
In the preferred embodiment of the present invention, in the step f, when the low-temperature tempering heat treatment is performed, the tempering temperature is controlled to be 200 to 280 ℃.
Compared with the prior art, the invention has the following obvious and prominent substantive characteristics and remarkable advantages:
1. according to the method, the components are improved after trace alloying elements Cu and rare earth elements are added into raw materials, ten-roller hot rolling is adopted to prepare a thin strip, and the high-silicon steel with obviously improved toughness and strength is prepared through a unique subsequent heat treatment process;
2. the method has the advantages of relatively simple and stable process, good finished plate shape, capability of meeting the use requirement and suitability for popularization and use.
Detailed Description
The above-described scheme is further illustrated below with reference to specific embodiments, which are detailed below:
the first embodiment is as follows:
in this embodiment, a method for preparing a high-toughness high-strength non-oriented high-silicon steel includes the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6.4%, Cu: 0.6%, rare earth element lanthanum (La): 0.2%, the balance being Fe and inevitable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1450 ℃, and the time of the refining process is 0.6h, so as to obtain high-silicon steel liquid;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 80% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.5 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 900 ℃, and controlling the normalizing heat treatment time to be 10 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is 10 ℃/min, the heat preservation temperature is 850 ℃, and the heat preservation time is 1 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 670 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 200 ℃ and the tempering time to be 0.5h, and after the tempering heat treatment is finished, continuously cooling the high-silicon steel plate to room temperature along with the furnace in an inert atmosphere;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
The non-oriented high silicon steel sheet prepared in this example was used as sample 1 for performance test analysis, and the test results are shown in table 1.
Example two:
this embodiment is substantially the same as the first embodiment, and is characterized in that:
in this embodiment, a method for preparing a high-toughness high-strength non-oriented high-silicon steel includes the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6.5%, Cu: 0.7%, rare earth element lanthanum (La): 0.3%, the balance being Fe and inevitable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1480 ℃, and the time of the refining process is 0.5h to obtain high-silicon steel molten steel;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction to be 85% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.4 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 920 ℃, and controlling the normalizing heat treatment time to be 13 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is 10 ℃/min, the heat preservation temperature is 850 ℃, and the heat preservation time is 1.2 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 680 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 250 ℃ and the tempering time to be 0.7h, and after the tempering heat treatment is finished, continuously cooling the high-silicon steel plate to room temperature along with the furnace in an inert atmosphere;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
The non-oriented high silicon steel sheet prepared in this example was used as sample 2 for performance test analysis, and the test results are shown in table 1.
Example three:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, a method for preparing a high-toughness high-strength non-oriented high-silicon steel includes the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6.6%, Cu: 0.8%, rare earth element cerium (Ce): 0.5%, the balance being Fe and unavoidable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1495 ℃, and the time of the refining process is 0.8h, so as to obtain high-silicon steel molten steel;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 90% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.3 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 930 ℃, and controlling the normalizing heat treatment time to be 12 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is 10 ℃/min, the heat preservation temperature is 850 ℃, and the heat preservation time is 1.5 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 675 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 280 ℃ and the tempering time to be 0.8h, and continuously cooling the high-silicon steel plate to room temperature along with the furnace in an inert atmosphere after the tempering heat treatment is finished;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
The non-oriented high silicon steel sheet prepared in this example was used as sample 3 for performance test analysis, and the test results are shown in table 1.
Example four:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, a method for preparing a high-toughness high-strength non-oriented high-silicon steel includes the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6.5%, Cu: 0.9%, rare earth element cerium (Ce): 0.4%, the balance being Fe and unavoidable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace at 1510 ℃, wherein the time of the refining process is 0.8h, and obtaining high-silicon steel liquid;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 90% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.25 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 940 ℃, and controlling the normalizing heat treatment time to be 15 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is 10 ℃/min, the heat preservation temperature is 850 ℃, and the heat preservation time is 1 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 680 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas for tempering heat treatment, controlling the tempering temperature to be 200 ℃ and the tempering time to be 1h, and continuously cooling the high-silicon steel plate to the room temperature along with the furnace in the inert atmosphere after the tempering heat treatment is finished;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
The non-oriented high silicon steel sheet prepared in this example was used as sample 4 for performance test analysis, and the test results are shown in table 1.
Example five:
this embodiment is substantially the same as the previous embodiment, and is characterized in that:
in this embodiment, a method for preparing a high-toughness high-strength non-oriented high-silicon steel includes the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6.5%, Cu: 0.5%, rare earth element cerium (Ce): 0.3%, the balance being Fe and inevitable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1505 ℃, and the time of the refining process is 0.8h, so as to obtain high-silicon steel molten steel;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 90% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.2 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 920 ℃, and controlling the normalizing heat treatment time to be 14 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is 10 ℃/min, the heat preservation temperature is 850 ℃, and the heat preservation time is 1.8 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 670 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 260 ℃ and the tempering time to be 0.8h, and after the tempering heat treatment is finished, continuously cooling the high-silicon steel plate to room temperature along with the furnace in an inert atmosphere;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
The non-oriented high silicon steel sheet prepared in this example was used as sample 5 for performance test analysis, and the test results are shown in table 1.
TABLE 1 Performance test results of non-oriented high silicon steel sheet samples prepared in the above examples of the present invention
| Sample (I) | Tensile strength (MPa) | Elongation (%) |
| Sample 1 | 562 | 0.52 |
| Sample 2 | 553 | 0.48 |
| Sample 3 | 570 | 0.54 |
| Sample No. 4 | 573 | 0.55 |
| Sample No. 5 | 564 | 0.52 |
As can be seen from Table 1, the room-temperature tensile strength of the 5 sample samples reaches more than 550MPa, the highest tensile strength reaches 573MPa, and the elongation is basically more than 0.5%, while the as-cast high-silicon steel obtained by ordinary smelting is very brittle, the tensile strength is only about 250MPa, and the elongation is about 0.1%, and the room-temperature tensile strength of the international finished high-silicon steel and the high-silicon steel in laboratories of other researchers is 450-480 MPa, and the elongation is 0.2-0.4%, and the tensile strength and the elongation represent the strength and the toughness of the material, so that the high-toughness high-strength high-silicon steel can be successfully prepared by the preparation method provided by the invention. The method of the embodiment of the invention comprises the following process flows: vacuum smelting, ten-roller hot rolling, normalizing, high-temperature heat treatment, cooling and water quenching, low-temperature annealing, acid washing and coating. According to the method, the components are improved after the trace alloying elements Cu and the rare earth elements are added into the raw materials, ten-roller hot rolling is adopted to prepare the thin strip, and the high-silicon steel with obviously improved toughness and strength is prepared through a unique subsequent heat treatment process.
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various changes may be made according to the purpose of the invention, and any changes, modifications, substitutions, combinations or simplifications made according to the spirit and principle of the technical solution of the present invention should be equivalent substitutions, so long as the purpose of the present invention is met, and the present invention is within the protection scope of the present invention as long as the technical principle and the inventive concept of the method for preparing the high-toughness high-strength non-oriented high silicon steel of the present invention are not deviated.
Claims (10)
1. A preparation method of high-toughness high-strength non-oriented high-silicon steel is characterized by comprising the following steps: the method comprises the following steps:
a. the vacuum smelting process comprises the following steps:
the raw materials with the purity of 99.99 percent and above are adopted, and the raw materials comprise the following components in percentage by weight: si: 6-7%, Cu: 0.5-1%, rare earth element lanthanum (La) or cerium (Ce): 0.2-0.5%, and the balance of Fe and inevitable impurities; smelting the mixed raw materials by using a medium-frequency vacuum induction furnace, wherein the smelting temperature is 1400-1600 ℃, and the time of the refining process is at least 30min to obtain high-silicon steel liquid;
b. ten-roller hot rolling:
casting the high-silicon steel obtained by smelting in the step a to obtain the high-silicon steel; then, carrying out multi-pass hot rolling on the high-silicon steel at 950-1050 ℃, and controlling the total reduction amount to be 75-95% to obtain a hot-rolled high-silicon steel plate with the thickness of 0.2-0.5 mm;
c. normalizing heat treatment:
b, performing normalizing heat treatment on the hot-rolled high-silicon steel plate prepared in the step b at 900-950 ℃, and controlling the normalizing heat treatment time to be 10-15 min;
d. high-temperature heat treatment:
c, performing high-temperature heat treatment on the high-silicon steel plate subjected to the normalizing heat treatment in the step c, wherein the heat treatment atmosphere is hydrogen, the heating rate is not higher than 10 ℃/min, the heat preservation temperature is not lower than 850 ℃, and the heat preservation time is 1-2 h;
e. cooling and water quenching heat treatment:
d, cooling the high-silicon steel plate subjected to heat preservation in the step d to 670-690 ℃ along with the furnace, then performing water quenching treatment, and cooling to room temperature;
f. low-temperature tempering heat treatment:
placing the high-silicon steel plate subjected to water quenching heat treatment in the step e under the protection of inert gas, carrying out tempering heat treatment, controlling the tempering temperature to be 200-300 ℃ and the tempering time to be 0.5-1 h, and after the tempering heat treatment is finished, continuously cooling the high-silicon steel plate to room temperature along with the furnace in the inert atmosphere;
g. acid pickling treatment and coating preparation:
and d, removing surface oxide scales of the high-silicon steel plate subjected to the low-temperature tempering heat treatment in the step d by acid washing, coating an MgO coating on the surface of the high-silicon steel plate, and then coiling to obtain a non-oriented high-silicon steel sheet coil product.
2. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step a, when the vacuum smelting process is carried out, the refining time is controlled to be 0.5-1 h.
3. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step a, before the vacuum smelting process is carried out, vacuumizing is carried out to be not higher than 10-4Pa ensures the anaerobic environment, and the purity of the inert protective atmosphere is not less than 99.999 percent.
4. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step a, the raw materials comprise the following components in parts by weight: si: 6.4-6.6%, Cu: 0.5-0.9%, rare earth elements: 0.2-0.5%, and the balance of Fe and inevitable impurities.
5. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step a, the rare earth elements in the raw materials are lanthanum (La) and cerium (Ce), or mixed rare earth elements of lanthanum (La) and cerium (Ce).
6. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: and b, performing hot rolling processing, controlling the total reduction amount to be 80-90%, and preparing the hot-rolled high-silicon steel plate.
7. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: and c, performing normalizing heat treatment on the hot-rolled high-silicon steel plate at 900-940 ℃ when performing normalizing heat treatment.
8. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step d, when high-temperature heat treatment is carried out, the heat preservation time is 1-1.8 h.
9. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step e, when water quenching heat treatment is carried out, the high-silicon steel plate is cooled to 670-680 ℃ along with the furnace, and then water quenching treatment is carried out.
10. The method for preparing the high-toughness high-strength non-oriented high-silicon steel as claimed in claim 1, wherein: in the step f, when low-temperature tempering heat treatment is carried out, the tempering temperature is controlled to be 200-280 ℃.
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