CN114381578A - Method for controlling inclusions in steel - Google Patents
Method for controlling inclusions in steel Download PDFInfo
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- CN114381578A CN114381578A CN202111514964.4A CN202111514964A CN114381578A CN 114381578 A CN114381578 A CN 114381578A CN 202111514964 A CN202111514964 A CN 202111514964A CN 114381578 A CN114381578 A CN 114381578A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- 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
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Abstract
The application relates to the technical field of steel making, in particular to a method for controlling inclusions in steel. The method comprises the following steps: smelting molten iron in a converter to obtain smelting molten steel; performing LF smelting on the smelting molten steel to obtain refined molten steel; and RH smelting the refined molten steel to obtain target molten steel, wherein the mass concentration of calcium in the target molten steel is controlled to be 8-12ppm and the mass concentration of oxygen in the target molten steel is controlled to be 10-12ppm, so that the molar ratio of calcium sulfide to aluminum oxide in the target molten steel is 0.1-0.9. The calcium sulfide and aluminum oxide composite inclusions can be formed in the solidification process of the target molten steel, the average size of the inclusions in the target molten steel is controlled, the average size of the inclusions is reduced, the anti-fatigue capability is provided, and the service life is prolonged; meanwhile, the content of brittle alumina inclusions with sharp corners is reduced, the content of spheroidal inclusions is increased, fatigue failure is not easily caused, the problem of fatigue cracking is solved, and the service life of the wheel steel is prolonged.
Description
Technical Field
The application relates to the technical field of steel making, in particular to a method for controlling inclusions in steel.
Background
The wheel is an important part of the automobile, and the structure and the performance of the wheel directly influence the safety and technical performance of the whole automobile. The failure mode of the wheel is mainly the forming failure and the fatigue failure, wherein more than 80 percent of the failure modes are caused by the fatigue failure, so the fatigue life of the wheel steel is the most important performance index of the wheel.
With the development of light weight, high performance and heavy-duty transportation of automobiles, higher requirements are put on the safety and reliability of wheels. The inclusions existing in the matrix of the steel material have great influence on the fatigue life of the wheel steel, particularly the large-size inclusions have fatal influence on the fatigue performance, and particularly in a high-cycle fatigue test, the fatigue failure of a long-life region mainly originates from the large-size non-metallic inclusions in the steel. The development of wheel steel with high strength and long service life is the trend of the current wheel steel production and application, and the improvement of the strength and the prolongation of the fatigue life of the wheel steel are urgently needed. Therefore, the study of the influence of inclusions on fatigue life is one of the main directions of current wheel steels. Through early analysis work, the fatigue cracking mainly originates from large-size nonmetallic inclusions in the steel. How to control the inclusions and avoid fatigue cracking of wheel steel becomes the key point of research.
Disclosure of Invention
The application provides a method for controlling inclusions in steel, which aims to solve the technical problem of fatigue cracking of wheel steel.
In a first aspect, the present application provides a method of controlling inclusions in steel, the method comprising the steps of:
smelting molten iron in a converter to obtain smelting molten steel;
performing LF smelting on the smelting molten steel to obtain refined molten steel;
and RH smelting the refined molten steel to obtain target molten steel, wherein the mass concentration of calcium in the target molten steel is controlled to be 8-12ppm and the mass concentration of oxygen in the target molten steel is controlled to be 10-12ppm, so that the molar ratio of calcium sulfide to aluminum oxide in the target molten steel is 0.1-0.9.
Optionally, in the RH smelting, a ratio of the mass concentration of the calcium to the mass concentration of the oxygen is 0.5 to 1.5.
Optionally, the end point temperature of the converter smelting is 1650-1660 ℃.
Optionally, the converter smelting comprises:
controlling the mass concentration of the converter end point oxygen to be 300-600ppm, controlling the end point carbon content of the converter to be 0.03-0.045% in terms of mass fraction, and controlling the mass concentration of the converter end point sulfur to be less than or equal to 50 ppm;
during tapping of the converter smelting, the contents of Si and Al are respectively adjusted according to the chemical components of the target molten steel so as to reduce the oxidability of the molten steel and the slag.
Optionally, the converter smelting further comprises: in the tapping process of the converter smelting, lime is added, the granularity of the lime is 10-30mm, and the addition amount is 400-600 kg.
Optionally, the smelting molten steel is subjected to LF smelting to obtain refined molten steel, and the refining molten steel comprises: and performing LF smelting on the smelting molten steel, and controlling the mass concentration of sulfur in the refining molten steel to be less than 20ppm to obtain refined molten steel.
Optionally, the LF smelting further comprises: adding synthetic slag according to the target alkalinity of the LF refining slag.
Optionally, the synthetic slag comprises the following components in percentage by mass: CaO: 60% -70%, MgO: 5% -15% of Al2O3：5％～10％，SiO2＜6％，CaF2: 8 to 15 percent of sulfur, less than 0.05 percent of sulfur and the balance of inevitable impurities.
Optionally, in the final slag of the LF smelting, the sum of the MnO content and the FeO content is less than 1% in mass fraction.
In a second aspect, the present application provides a wheel steel made by the method of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method provided by the embodiment of the application, the refining molten steel is subjected to RH smelting to obtain the target molten steel, the mass concentration of calcium in the target molten steel is 8-12ppm and the mass concentration of oxygen in the target molten steel is 10-12ppm, so that the molar ratio of calcium sulfide to aluminum oxide is 0.1-0.9, calcium sulfide and aluminum oxide composite inclusions can be formed in the solidification process of the target molten steel, the average size of inclusions in the target molten steel is controlled, the average size of the inclusions is reduced, the fatigue resistance is provided, and the service life is prolonged; the molar ratio of the calcium sulfide to the alumina is 0.1-0.9, the content of brittle alumina inclusions with sharp corners can be reduced, and the brittle alumina inclusions with the sharp corners are easy to cause fatigue failure; the content of the spheroidal inclusions is improved, fatigue failure is not easy to cause, the problem of fatigue cracking is solved, and the service life of the wheel steel is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic flow chart illustrating a method for controlling inclusions in steel according to an embodiment of the present invention;
fig. 2 is a graph comparing inclusions provided in example 1 and comparative example 1 of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
In a first aspect, the present application provides a method for controlling inclusions in steel, as shown in fig. 1, comprising the steps of:
s1, smelting molten iron in a converter to obtain smelting molten steel;
s2, performing LF smelting on the smelting molten steel to obtain refined molten steel;
and S3, carrying out RH smelting on the refined molten steel to obtain target molten steel, wherein the mass concentration of calcium in the target molten steel is controlled to be 8-12ppm and the mass concentration of oxygen in the target molten steel is controlled to be 10-12ppm, so that the molar ratio of calcium sulfide to aluminum oxide in the target molten steel is 0.1-0.9.
In the embodiment of the application, the mass concentration of calcium in the target molten steel can be determined by adding calcium; the calcium is added in an amount of 16-24 g/ton steel, and can be added by using calcium wires with the diameter of 9 +/-0.5 mm, and the speed of feeding the calcium wires is 1.5-3 m/min.
As an alternative embodiment, in the RH smelting, the ratio of the mass concentration of the calcium to the mass concentration of the oxygen is 0.5 to 1.5.
In the embodiment of the application, the ratio of the mass concentration of calcium to the mass concentration of oxygen is controlled to be 0.5-1.5, the ratio is less than 0.5, the impurity inclusion denaturation of aluminum oxide is insufficient, manganese sulfide inclusion can be formed in the solidification process, the performance of steel is influenced, the ratio is greater than 1.5, the content of added calcium is too much, and large-size calcium aluminate inclusion with high melting point can be formed, and the performance of steel is influenced.
As an alternative embodiment, the end temperature of the converter smelting is 1650-1660 ℃.
In the embodiment of the application, the end point temperature of the converter smelting is controlled to be 1650-1660 ℃, so that the temperature rise time of the LF furnace process can be reduced, secondary oxidation is avoided, and the quantity of inclusions is reduced.
As an alternative embodiment, the converter smelting comprises:
controlling the mass concentration of the converter end point oxygen to be 300-600ppm, controlling the end point carbon content of the converter to be 0.03-0.045% in terms of mass fraction, and controlling the mass concentration of the converter end point sulfur to be less than or equal to 50 ppm;
during tapping of the converter smelting, the contents of Si and Al are respectively adjusted according to the chemical components of the target molten steel so as to reduce the oxidability of the molten steel and the slag.
In the embodiment of the application, the reason for controlling the mass concentration of the converter end point oxygen to be 300-600ppm is that on one hand, the generation of impurities can be reduced, on the other hand, the consumption of aluminum is reduced, so that the cost is reduced, a large amount of impurities can be formed in a ladle due to too high concentration, meanwhile, the oxidability of top slag is increased, the difficulty of the LF furnace treatment process is increased, and the converter end point temperature of 1650-1660 ℃ cannot be ensured due to too low concentration.
In the embodiment of the application, the carbon content at the end point of the converter is controlled to be 0.03-0.045% in mass fraction, so that the product of the carbon concentration and the oxygen concentration at the end point of the converter is favorably kept in a fixed range, namely 0.0013-0.0018%, and the carbon content is controlled to control the concentrations of the carbon and the oxygen.
In the embodiment of the application, the reason for controlling the mass concentration of the sulfur at the end point of the converter to be less than or equal to 50ppm is to ensure that the sulfur content in the LF refining process is less than 20ppm, and the concentration is too high, so that the sulfur content in the next process is not favorably controlled.
In the embodiment of the application, tapping temperature and components are controlled during converter smelting, and preferably Si and Al are adjusted at one time during tapping, so that the oxidability of molten steel and slag is reduced, endogenous impurities are ensured to float upwards sufficiently, the washing desulfurization effect of tapping slag is enhanced, and the LF desulfurization pressure is reduced.
In the embodiment of the application, Si and Al can be adjusted at one time according to the component requirements of the target steel grade in the converter tapping process, and whatever the target steel grade, the required middle-upper line is judged according to the component of the target steel grade to adjust, so that the oxidability of molten steel and slag is reduced.
As an optional embodiment, the converter smelting further includes: in the tapping process of the converter smelting, lime is added, the granularity of the lime is 10-30mm, and the addition amount is 400-600 kg.
In the embodiment of the application, lime can be added for slag washing in the tapping process of the converter, and further desulfurization is carried out. If the addition amount of the ash is more than 500Kg, the ash can be added in 2-3 batches; and adding small-particle lime when tapping for 1-1.5min, adding lime when tapping is not allowed, and easily bonding the ladle bottom.
As an alternative embodiment, the performing LF smelting on the smelting molten steel to obtain refined molten steel includes: and performing LF smelting on the smelting molten steel, and controlling the mass concentration of sulfur in the refining molten steel to be less than 20ppm to obtain refined molten steel.
In the embodiment of the application, the mass concentration of sulfur in the refined molten steel is controlled to be less than 20ppm, the concentration of calcium sulfide can be controlled, the molar ratio of calcium sulfide to aluminum oxide can be controlled, calcium sulfide and aluminum oxide composite inclusions are formed in the solidification process of the target molten steel, the average size of the inclusions in the target molten steel is controlled, the average size of the inclusions is reduced, the anti-fatigue capability is provided, and the service life of steel is prolonged.
As an optional implementation manner, the LF smelting further includes: adding synthetic slag according to the target alkalinity of the LF refining slag.
In the embodiment of the application, the target alkalinity of the LF refining slag is ensured to be 8-12 by adjusting the amount of the added synthetic slag. The alkalinity of the LF refining slag is controlled to be 8-12, and the beneficial effect of controlling the quantity of the inclusions is achieved.
As an optional embodiment, the synthetic slag comprises the following components in percentage by mass: CaO: 60% -70%, MgO: 5% -15% of Al2O3：5％～10％，SiO2＜6％，CaF2: 8 to 15 percent of sulfur, less than 0.05 percent of sulfur and the balance of inevitable impurities.
As an alternative embodiment, the sum of the MnO and FeO contents in the final slag of the LF smelting is less than 1% by mass fraction.
In the embodiment of the application, the reason for controlling the sum of the MnO and FeO content to be less than 1% in mass fraction is to ensure the reducibility of the top slag, the adverse effect of increasing the inclusions caused by high oxidizability of the top slag due to too high mass fraction is ensured, and the lower the control is, the better the control is.
In a second aspect, the present application provides a wheel steel made by the method of the first aspect.
The process of the present invention will be described in detail below with reference to examples, comparative examples and experimental data.
Example 1
A method for controlling inclusions in steel, wherein the end point temperature of a converter is 1655 ℃, the end point oxygen of the converter is 500ppm, the end point carbon content of the converter is 0.35%, and the end point sulfur content of the converter is 46 ppm; adding 600kg of small-particle lime into the converter steel tapping process in 3 batches for slag washing, and further desulfurizing; the Si content of converter tapping is adjusted to 0.11%, the Al content is adjusted to 0.04%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 10; the content of refined final slag (MnO + FeO) is 0.05 percent, and the sulfur content of the molten steel is 18 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the feeding speed is 2m/min, the calcium content is 10ppm, the oxygen content is 10ppm, the ratio of the calcium content to the oxygen content is 1.0, and the components of the inclusion are compounds of calcium sulfide and aluminum oxide, wherein the ratio of the calcium sulfide to the aluminum oxide is 0.5. The inclusions in this example are shown in the left panel of FIG. 2.
Example 2
A method for controlling inclusions in steel, the end point temperature of a converter is 1650 ℃, the end point oxygen of the converter is 300ppm, the end point carbon content of the converter is 0.30%, and the end point sulfur content of the converter is 50 ppm; adding 600kg of small-particle lime into the converter steel tapping process in 3 batches for slag washing, and further desulfurizing; the content of Si in converter tapping is adjusted to 0.10%, the content of Al is adjusted to 0.045%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 12; the refining final slag (MnO + FeO) is 0.095%, and the sulfur content of the molten steel is 19.8 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the feeding speed is 2m/min, the calcium content is 12ppm, the oxygen content is 12ppm, the ratio of the calcium content to the oxygen content is 1.0, and the components of the inclusion are compounds of calcium sulfide and aluminum oxide, wherein the ratio of the calcium sulfide to the aluminum oxide is 0.9.
Example 3
A method for controlling inclusions in steel, the end point temperature of a converter is 1660 ℃, the end point oxygen of the converter is 600ppm, the end point carbon content of the converter is 0.45%, and the end point sulfur content of the converter is 42 ppm; adding 600kg of small-sized lime into the converter steel tapping process in 2 batches for slag washing, and further desulfurizing; the content of Si in converter tapping is adjusted to 0.12%, the content of Al is adjusted to 0.050%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 8; the content of refined final slag (MnO + FeO) is 0.08%, and the sulfur content of the molten steel is 15 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the feeding speed is 2m/min, the calcium content is 8ppm, the oxygen content is 12ppm, the ratio of the calcium content to the oxygen content is 1.5, and the components of the inclusion are compounds of calcium sulfide and aluminum oxide, wherein the ratio of the calcium sulfide to the aluminum oxide is 0.1.
Comparative example 1
A method for controlling inclusions in steel, wherein the end point temperature of a converter is 1655 ℃, the end point oxygen of the converter is 500ppm, the end point carbon content of the converter is 0.35%, and the end point sulfur content of the converter is 46 ppm; adding 600kg of small-particle lime into the converter steel tapping process in 3 batches for slag washing, and further desulfurizing; the Si content of converter tapping is adjusted to 0.11%, the Al content is adjusted to 0.04%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 10; the content of refined final slag (MnO + FeO) is 0.05 percent, and the sulfur content of the molten steel is 18 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the wire feeding speed is 2m/min, the calcium content is 15ppm, the oxygen content is 6ppm, the ratio of the calcium content to the oxygen content is 2.5, and the components of the inclusion are compounds of calcium sulfide and aluminum oxide, wherein the ratio of the calcium sulfide to the aluminum oxide is 1.2. The inclusions in this comparative example are shown in the right diagram of FIG. 2.
Comparative example 2
A method for controlling inclusions in steel, wherein the end point temperature of a converter is 1655 ℃, the end point oxygen of the converter is 500ppm, the end point carbon content of the converter is 0.35%, and the end point sulfur content of the converter is 46 ppm; adding 600kg of small-particle lime into the converter steel tapping process in 3 batches for slag washing, and further desulfurizing; the Si content of converter tapping is adjusted to 0.11%, the Al content is adjusted to 0.04%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 10; the content of refined final slag (MnO + FeO) is 0.05 percent, and the sulfur content of the molten steel is 15 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the feeding speed is 2m/min, the calcium content is 20ppm, the oxygen content is 10ppm, the ratio of the calcium content to the oxygen content is 1, the components of the inclusion are compounds of calcium sulfide and aluminum oxide, and the ratio of the calcium content to the oxygen content is 1.0.
Comparative example 3
A method for controlling inclusions in steel, wherein the end point temperature of a converter is 1655 ℃, the end point oxygen of the converter is 500ppm, the end point carbon content of the converter is 0.35%, and the end point sulfur content of the converter is 46 ppm; adding 600kg of small-particle lime into the converter steel tapping process in 3 batches for slag washing, and further desulfurizing; the Si content of converter tapping is adjusted to 0.11%, the Al content is adjusted to 0.04%, and the oxidability of molten steel and slag is reduced; adjusting the amount of the synthetic slag to ensure that the alkalinity of the LF refining slag is 10; the content of refined final slag (MnO + FeO) is 0.05 percent, and the sulfur content of the molten steel is 19 ppm; the calcium feeding linear quantity is controlled to be 20 g/ton steel, the feeding speed is 2m/min, the calcium content is 5ppm, the oxygen content is 11ppm, the ratio of the calcium content to the oxygen content is 0.45, the components of the inclusion are compounds of calcium oxide and aluminum oxide, and the ratio of the calcium content to the oxygen content is 0.05.
The test results of the target molten steels and wheel steels prepared according to the methods of examples and comparative examples are shown in table 1.
Table 1 test results of the target molten steel and the wheel steel prepared in the example and comparative example groups.
According to the national standard GB/T10561-2005, the inclusion rating in steel is evaluated, and the percent of pass of the inclusion rating in the examples and the comparative examples is less than or equal to 1.5.
As can be seen from Table 1, the average size of inclusions in the comparative example group is smaller than that in the comparative example group, the qualification rate of the inclusions is more than 95%, and the fatigue resistance is good; the content of the spheroidal inclusions in the embodiment group is lower than that in the comparison group, the content is lower than 85%, the inclusion rating qualified rate is lower than 90%, and the fatigue resistance is poor.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for controlling inclusions in steel, comprising the steps of:
smelting molten iron in a converter to obtain smelting molten steel;
performing LF smelting on the smelting molten steel to obtain refined molten steel;
and RH smelting the refined molten steel to obtain target molten steel, wherein the mass concentration of calcium in the target molten steel is controlled to be 8-12ppm and the mass concentration of oxygen in the target molten steel is controlled to be 10-12ppm, so that the molar ratio of calcium sulfide to aluminum oxide in the target molten steel is 0.1-0.9.
2. The method according to claim 1, wherein a ratio of the mass concentration of calcium to the mass concentration of oxygen in the RH smelting is 0.5 to 1.5.
3. The method of claim 1, wherein the end point temperature of the converter smelting is 1650-1660 ℃.
4. The method of claim 1, wherein the converter smelting comprises:
controlling the mass concentration of the converter end point oxygen to be 300-600ppm, controlling the end point carbon content of the converter to be 0.03-0.045% in terms of mass fraction, and controlling the mass concentration of the converter end point sulfur to be less than or equal to 50 ppm;
during tapping of the converter smelting, the contents of Si and Al are respectively adjusted according to the chemical components of the target molten steel so as to reduce the oxidability of the molten steel and the slag.
5. The method of claim 1, wherein the converter smelting further comprises: in the tapping process of the converter smelting, lime is added, the granularity of the lime is 10-30mm, and the addition amount is 400-600 kg.
6. The method according to claim 1, wherein the subjecting the molten steel to LF smelting to obtain refined molten steel comprises: and performing LF smelting on the smelting molten steel, and controlling the mass concentration of sulfur in the refining molten steel to be less than 20ppm to obtain refined molten steel.
7. The method of claim 1, wherein the LF smelting further comprises: adding synthetic slag according to the target alkalinity of the LF refining slag.
8. The method of claim 7, wherein the first and second light sources are selected from the group consisting of,the synthetic slag comprises the following components in percentage by mass: CaO: 60% -70%, MgO: 5% -15% of Al2O3：5％～10％，SiO2＜6％，CaF2: 8 to 15 percent of sulfur, less than 0.05 percent of sulfur and the balance of inevitable impurities.
9. The method according to claim 1, characterized in that the sum of MnO and FeO contents in the final slag of the LF smelting is < 1% by mass fraction.
10. A wheel steel produced by the method of any one of claims 1 to 9.
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