Preparation method for wheel steel and wheel steel

Abstract

A preparation method for wheel steel and wheel steel. The preparation method comprises: when refining in an LF furnace is finished, performing first-stage magnesium treatment on refined molten steel in the LF furnace, so that the mass percent of MgO of inclusions in the refined molten steel reaches 30%-60%, wherein the magnesium adding amount of the first-stage magnesium treatment is 0.1-0.2 kg / ton of steel; and performing RH vacuum treatment on the refined molten steel to obtain RH-refined molten steel, and performing second-stage magnesium treatment when the RH vacuum treatment is finished, so that the mass percent of MgO of the inclusions in the molten steel reaches 61%-100%, wherein the magnesium adding amount of the second-stage magnesium treatment is 0.35-0.5 kg / ton of steel, and the RH vacuum treatment comprises performing soft stirring at a flow rate of 100-300 L / min for 5-10 min after the second-stage magnesium treatment. Wheel steel having fewer inclusions and good mechanical property and fatigue property is prepared from the preparation method of the present application.

Description

Preparation methods of wheel steel and wheel steel Technical Field

[0001] This application belongs to the field of steel smelting technology, specifically relating to a method for preparing wheel steel and wheel steel and steel products. Background Technology

[0002] Due to its critical application in automobile manufacturing, wheel steel has extremely high requirements for material strength, toughness, and cleanliness. The presence of inclusions can seriously affect the performance of wheel steel, especially its fatigue life. Controlling the type, size, and distribution of inclusions is key to improving the performance of wheel steel.

[0003] Therefore, there is an urgent need for a new process to improve it. Summary of the Invention

[0004] In view of this, this application provides a method for preparing wheel steel, as well as wheel steel and steel products, with the aim of providing wheel steel with good cleanliness and good mechanical and fatigue properties.

[0005] In a first aspect, embodiments of this application provide a method for preparing wheel steel, comprising:

[0006] When the LF furnace refining is completed, the refined steel in the LF furnace is subjected to a first-stage magnesium treatment to make the MgO mass percentage of the inclusions in the refined steel reach 30% to 60%. The amount of magnesium added in the first-stage magnesium treatment is 0.1-0.2 kg / ton of steel.

[0007] The refined steel is subjected to RH vacuum treatment to obtain RH refined steel liquid; wherein, at the end of the RH vacuum treatment, a second-stage magnesium treatment is performed to make the MgO mass percentage of inclusions in the RH steel liquid reach 61% to 100%, wherein the amount of magnesium added in the second-stage magnesium treatment is 0.35-0.5 kg / ton of steel.

[0008] The RH vacuum treatment includes soft stirring at a flow rate of 100-300 L / min after the second magnesium treatment, and the soft stirring time is 5-10 min.

[0009] According to one embodiment of this application, before performing a first-stage magnesium treatment on the refined steel in the LF furnace at the end of the LF furnace refining process, the method further includes:

[0010] Molten steel is subjected to LF refining to obtain refined molten steel; wherein, the LF refining includes: adjusting the slag composition so that the mass percentage of Fe in the ladle refining slag at the end of LF refining is <0.5%, the C / A ratio of the refining slag is 1.4~1.8, and the S in the molten steel is ≤0.0015%, wherein the C / A ratio represents the mass ratio of calcium oxide / alumina.

[0011] According to an embodiment of one aspect of this application, the adjustment of slag composition includes: adding lime, top slag modifier, and low-silicon pre-melted refining slag, wherein the composition of the top slag modifier by mass percentage is: Al: 32-47%, CaO: 18-25%, Al2O3: 17-28%, SiO2: 3-8%, and the composition of the low-silicon pre-melted refining slag by mass percentage is: CaO: 40-55%, Al2O3: 35-45%, SiO2: 2-7%, MgO: 3-7%, thereby transforming the initial composition of the slag into the final composition of the slag.

[0012] According to an embodiment of one aspect of this application, the composition of the refining slag at the end of the LF refining process, by mass percentage, includes: CaO: 48%–54%, SiO2: 4.4%–6%, P2O5: 0.02%–0.03%, Al2O3: 31%–35%, MgO: 6.0%–6.9%, MnO: 0–0.15%, FeTOT: 0.15%–0.5%, and unavoidable impurities, with a CaO / SiO2 mass ratio of 8.5–12.

[0013] According to one embodiment of this application, before the first stage magnesium treatment of the refined steel in the LF furnace, the method further includes: performing soft stirring at a flow rate of 200-400 L / min for a time of 8-12 min.

[0014] According to one embodiment of this application, the RH vacuum treatment includes: a vacuum degree of 5-7 kPa in the RH furnace, a vacuum treatment time of 15-20 min, and a flow rate of 80-100 Nm³ for the boosting gas. 3 / h.

[0015] According to an embodiment of one aspect of this application, the chemical composition of the RH molten steel, by mass percentage, includes 0.2wt%≤C≤0.4wt%, 0.1wt%≤Si≤0.4wt%, 0.4wt%≤Mn≤2.0wt%, S≤0.0015wt%, 0.01wt%≤Ti≤0.04wt%, 0.001wt%≤B≤0.005wt%, N≤0.005wt%, with the remainder being iron and other unavoidable impurities.

[0016] Secondly, embodiments of this application provide a wheel steel, which is prepared by the method described in the first aspect.

[0017] According to one embodiment of this application, the inclusions in the wheel steel are classified according to GB / T 10561-2023, with Class B inclusions ≤ 1.0 grade and Class Ds inclusions ≤ 0.5 grade; the mechanical properties of the wheel steel meet the following requirements: yield strength ≥ 1000 MPa, tensile strength ≥ 1400 MPa, elongation ≥ 7%; the fatigue resistance of the wheel steel meets the following requirements: bending fatigue life ≥ 500,000 cycles, radial fatigue life ≥ 900,000 cycles.

[0018] This application has at least the following beneficial effects:

[0019] The method provided in this application involves a first-stage magnesium treatment and a second-stage magnesium treatment at the end of LF furnace refining and at the end of RH vacuum cycling, respectively, to transform liquid spherical calcium aluminate inclusions in the molten steel into solid inclusions, thereby improving the flotation and removal efficiency of inclusions, especially large-sized inclusions, and further refining the inclusions in the molten steel, so that the B-type inclusions in wheel steel or its rolled products are ≤1.0 grade and the Ds-type inclusions are ≤0.5 grade, thereby improving the mechanical properties and fatigue resistance of wheel steel. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the implementation regulations of this application, the drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 shows a micrograph of the morphology of non-metallic inclusions for wheels according to an embodiment of this application.

[0022] Figure 2 shows a micrograph of the morphology of non-metallic inclusions for wheels, which is a comparative example of this application.

[0023] Figure 3 shows a schematic diagram of the morphology of the Mg-Al inclusions and Mn / CaS composite inclusions in Example 1 of this application.

[0024] Figure 4 shows the energy dispersive spectroscopy (EDS) analysis of the peripheral Mn / CaS sulfide in Example 1 of this application.

[0025] Figure 5 shows the energy dispersive spectroscopy (EDS) analysis of the core Mg-Al inclusion in Example 1 of this application.

[0026] Figure 6 shows a schematic diagram of the morphology of pure MgO inclusions in Example 1 of this application.

[0027] Figure 7 shows the energy dispersive spectroscopy (EDS) analysis of pure MgO inclusions in Example 1 of this application. Detailed Implementation

[0028] To make the purpose, technical solution, and beneficial technical effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the implementation details described in this specification are merely for illustrative purposes and are not intended to limit the scope of this application.

[0029] For simplicity, this application only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form a range not explicitly stated; and any lower limit can be combined with other lower limits to form a range not explicitly stated, just as any upper limit can be combined with any other upper limit to form a range not explicitly stated. Furthermore, although not explicitly stated, every point or individual value between the endpoints of the range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit and combined with any other point or individual value or with other lower or upper limits to form a range not explicitly stated.

[0030] In the description of this application, it should be noted that, unless otherwise stated, "above" and "below" include the stated number, and "multiple" in "one or more" means two or more.

[0031] The foregoing description of this application is not intended to describe every disclosed implementation or method. Instead, the following description provides more specific examples of exemplary embodiments. Throughout the application, guidance is provided through a series of embodiments, which can be used in various combinations. The examples listed are representative only and should not be construed as exhaustive. Preparation method of steel for wheels

[0032] In a first aspect, embodiments of this application provide a method for preparing wheel steel, comprising:

[0033] When the LF furnace refining is completed, the refined steel in the LF furnace is subjected to a first-stage magnesium treatment to make the MgO mass percentage of the inclusions in the refined steel reach 30% to 60%. The amount of magnesium added in the first-stage magnesium treatment is 0.1-0.2 kg / ton of steel.

[0034] The refined steel is subjected to RH vacuum treatment to obtain RH refined steel liquid; wherein, at the end of the RH vacuum treatment, a second-stage magnesium treatment is performed to make the MgO mass percentage of inclusions in the RH steel liquid reach 61% to 100%, wherein the amount of magnesium added in the second-stage magnesium treatment is 0.35-0.5 kg / ton of steel.

[0035] The RH vacuum treatment includes soft stirring at a flow rate of 100-300 L / min after the second magnesium treatment, and the soft stirring time is 5-10 min.

[0036] According to the embodiments of this application, a first-stage magnesium treatment is performed to transform liquid calcium-aluminum-magnesium inclusions in the molten steel into solid inclusions, which is beneficial for the floating and removal of solid inclusions in the subsequent refining process. The molten steel is then subjected to RH vacuum treatment to promote the collision growth and floating removal of solid inclusions. Since magnesium is an active alkaline earth metal element, it is easy to volatilize during RH furnace treatment. The second-stage magnesium treatment transforms all inclusions in the molten steel into composite inclusions with a MgO content of 60-70% or pure MgO inclusions. These inclusions are relatively fine and can provide nucleation sites for easily deformable inclusions such as MnS and TiN that precipitate during solidification, forming composite inclusions of Mg oxides. This reduces the formation of strip-shaped MnS or chain-shaped TiN inclusions in the rolled product, thereby improving the fatigue resistance of wheel steel while taking into account its mechanical properties.

[0037] In some optional embodiments, before the first stage of magnesium treatment is performed on the refined steel in the LF furnace at the end of the LF furnace refining process, the method further includes:

[0038] Molten steel is subjected to LF refining to obtain refined molten steel. The LF refining process includes: adjusting the slag composition so that the Fe content in the ladle refining slag at the end of LF refining is <0.5% by mass, the C / A ratio of the refining slag is 1.4~1.8, and the S content in the molten steel is ≤0.0015%. The C / A ratio represents the mass ratio of calcium oxide to alumina. The C / A ratio of the refining slag can be selected from 1.5 to 1.7, etc.

[0039] According to the embodiments of this application, the Fe content in the refining slag is less than 0.5%, which means that the oxidizing power of the refining slag is low. This helps to reduce the secondary formation of oxide inclusions (such as alumina and silicon oxide), improve the purity of the molten steel, and thus reduce the adverse effects of inclusions on the steel properties. The C / A ratio is controlled within the range of 1.4 to 1.8, so that the ladle refining slag has good fluidity and stability at the steelmaking temperature, providing good kinetic conditions for the absorption of inclusions. In order to reduce the S content in the molten steel to the above range, the slag basicity is high, that is, the CaO content in the slag is increased. As the CaO content increases, the slag reacts with the molten steel through agitation, generating calcium aluminate inclusions. These inclusions are liquid and have a small wetting angle in the molten steel, making them difficult to remove. Adding a small amount of magnesium for light magnesium treatment can transform them into solid MgO-Al2O3-CaO inclusions, which then collide and polymerize to grow in the vacuum circulation treatment of the RH furnace, achieving effective removal.

[0040] During the solidification process of molten steel, sulfur precipitates sulfide inclusions (such as MnS inclusions). After rolling, these inclusions easily elongate along the rolling direction, forming long strips of MnS, which are extremely detrimental to the transverse ductility and impact toughness of the product, and reduce the fatigue resistance of the steel. Therefore, the sulfur content should be controlled within the aforementioned range.

[0041] In some alternative embodiments, the LF refining includes setting the temperature of the refined molten steel to 1520 to 1620°C.

[0042] In some optional embodiments, adjusting the slag composition includes adding lime, top slag modifier, and low-silicon pre-melted refining slag to transform the initial composition of the slag into the final composition of the slag.

[0043] In some optional embodiments, the composition of the refining residue at the end of the LF refining process, by mass percentage, includes: CaO: 48%–54%, SiO2: 4.4%–6%, P2O5: 0.02%–0.03%, Al2O3: 31%–35%, MgO: 6.0%–6.9%, MnO: 0–0.15%, R2O: 5%–12%, FeTOT: 0.15%–0.5%, and unavoidable impurities, with a CaO / SiO2 mass ratio of 8.5–12.

[0044] According to the embodiments of this application, a first-stage magnesium treatment is performed to transform liquid calcium-aluminum-magnesium inclusions in the molten steel into solid inclusions, which is beneficial for the floating and removal of solid inclusions in the subsequent refining process.

[0045] In some optional embodiments, before the first stage magnesium treatment of the refined steel in the LF furnace, the method further includes: soft stirring at a flow rate of 200-400 L / min for 8-12 min, so as to allow large inclusions in the molten steel to aggregate and float to the surface for removal.

[0046] In some optional embodiments, the LF refining process in the LF furnace includes: soft stirring with a protective gas, which can be nitrogen, an inert gas, etc. The inert gas can be argon.

[0047] In some optional embodiments, the RH vacuum treatment includes: a vacuum degree of 5-7 kPa in the RH furnace, a vacuum treatment time of 15-20 min, and a flow rate of 80-100 Nm³ for the boosting gas. 3 / h.

[0048] According to the embodiments of this application, the vacuum degree is 5-7 kPa, and the ultimate vacuum is not used to reduce the turbulence intensity of the molten steel in the RH furnace, so as to reduce the entrainment of inclusions by the molten steel and facilitate the removal of inclusions after they float to the steel slag interface.

[0049] In some optional embodiments, the chemical composition of the RH molten steel, by mass percentage, includes 0.2wt%≤C≤0.4wt%, 0.1wt%≤Si≤0.4wt%, 0.4wt%≤Mn≤2.0wt%, S≤0.0015wt%, 0.01wt%≤Ti≤0.04wt%, 0.001wt%≤B≤0.005wt%, N≤0.005wt%, with the remainder being iron and other unavoidable impurities.

[0050] According to the embodiments of this application, the wheel steel with this chemical composition has extremely high requirements for the material's strength, toughness, and cleanliness. Therefore, controlling the chemical composition of RH molten steel is beneficial for using appropriate processes to control inclusions and prepare wheel steel that balances mechanical properties and has good fatigue resistance.

[0051] Secondly, embodiments of this application provide a wheel steel, which is prepared by the method described in the first aspect.

[0052] In some optional embodiments, the inclusions in the wheel steel are classified according to GB / T 10561-2023, with Class B inclusions ≤ 1.0 grade and Class Ds inclusions ≤ 0.5 grade; the mechanical properties of the wheel steel meet the following requirements: yield strength ≥ 1000 MPa, tensile strength ≥ 1400 MPa, elongation ≥ 7%; the fatigue resistance of the wheel steel meets the following requirements: bending fatigue life ≥ 500,000 cycles, radial fatigue life ≥ 900,000 cycles. Example

[0053] The following embodiments describe the disclosure of this application in more detail. These embodiments are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on weight, and all reagents used in the embodiments are commercially available or synthesized by conventional methods and can be used directly without further processing, and the instruments used in the embodiments are commercially available. Example 1

[0054] This embodiment provides a method for preparing steel for wheels, including the following steps:

[0055] During the LF furnace refining process, lime, top slag modifier and low silicon pre-melted refining slag are added to adjust the slag composition. At the end of the LF refining, the composition of the refining slag in the ladle is shown in Appendix 1, Furnace 1. The slag is glassy and has good fluidity. The refining slag has a high binary basicity. After strong stirring desulfurization, the S content in the steel is 0.0005wt%.

[0056] Before feeding magnesium wire, perform soft blowing for 8-12 minutes to carry out the first stage of magnesium treatment on the molten steel. The amount of magnesium fed is 0.12 kg / ton of steel, so that the mass percentage of MgO in the refined molten steel is 30% to 60%.

[0057] The RH furnace was vacuum-treated for 18 minutes, with a vacuum level of 5.8 kPa and a booster gas flow rate of 85 Nm³. 3 / h. After vacuum treatment, the molten steel undergoes a second magnesium treatment, with a magnesium feed rate of 0.45 kg / ton of steel, to ensure that the MgO mass percentage of inclusions in the RH molten steel is 75% to 100%. The RH vacuum treatment includes soft stirring at a flow rate of 200 L / min for 8 min after the second magnesium treatment. The chemical composition of the RH molten steel, by mass percentage, includes 0.2 wt% ≤ C ≤ 0.4 wt%, 0.1 wt% ≤ Si ≤ 0.4 wt%, 0.4 wt% ≤ Mn ≤ 2.0 wt%, S ≤ 0.0015 wt%, 0.01 wt% ≤ Ti ≤ 0.04 wt%, 0.001 wt% ≤ B ≤ 0.005 wt%, N ≤ 0.005 wt%, with the remainder being iron and other unavoidable impurities.

[0058] Sampling, sample preparation, and metallographic analysis are performed on the rolled material, as shown in Figure 1, which is a morphological diagram of non-metallic inclusions in the production of wheel steel rolled material provided in an embodiment of the present invention. Example 2

[0059] The difference between this embodiment and Embodiment 1 is that the sulfur content in the steel is 0.0007 wt%. The composition of the refining slag in the ladle at the end of refining is shown in Appendix Table 1, Heat 2. Example 3

[0060] The difference between this embodiment and Embodiment 1 is that the sulfur content in the steel is 0.0010 wt%. The composition of the refining slag in the ladle at the end of refining is shown in Appendix Table 1, Heat 3.

[0061] Table 1. Composition of refining slag in ladle at the end of LF refining (%)

[0062] Example 4

[0063] The difference between this embodiment and Embodiment 1 is that the amount of magnesium added in the first magnesium treatment is 0.1 kg / ton of steel; and the amount of magnesium added in the second magnesium treatment is 0.5 kg / ton of steel. Example 5

[0064] The difference between this embodiment and Embodiment 1 is that the amount of magnesium added in the first magnesium treatment is 0.2 kg / ton of steel; and the amount of magnesium added in the second magnesium treatment is 0.35 kg / ton of steel. Example 6

[0065] The difference between this embodiment and Embodiment 1 is that the RH vacuum treatment includes soft stirring at a flow rate of 300 L / min after the second magnesium treatment, and the soft stirring time is 5 min. Example 7

[0066] The difference between this embodiment and Embodiment 1 is that the RH vacuum treatment includes soft stirring at a flow rate of 100 L / min after the second magnesium treatment, and the soft stirring time is 10 min. Comparative Example 1

[0067] The difference between this comparative example and Example 1 is that the RH vacuum treatment includes soft stirring at a flow rate of 120 L / min after the second magnesium treatment, and the soft stirring time is 1 min. Comparative Example 2

[0068] The difference between this comparative example and Example 1 is that the first stage of magnesium treatment is not performed during the LF furnace refining process. Comparative Example 3

[0069] The difference between this comparative example and Example 1 is that the second magnesium treatment is not performed in the RH vacuum treatment. Test section

[0070] The mechanical properties and fatigue resistance of the wheel steels prepared in the examples and comparative examples were tested, and inclusions were detected using optical microscopes and scanning electron microscopes.

[0071] The fatigue resistance performance was tested using a fatigue testing machine;

[0072] Tensile strength and yield strength: Tested in accordance with GB / T 228.1 "Metallic materials, tensile testing - Part 1: Test method at room temperature".

[0073] Elongation: Tested in accordance with GB / T 228.1 "Metallic materials, tensile testing - Part 1: Test method at room temperature".

[0074] The measured results are shown in Table 2.

[0075] Table 2. Test results of wheel steel in the examples and comparative examples.

[0076]

[0077] The performance parameters measured above are taken as average values.

[0078] Figure 1 shows a micrograph of wheel steel according to an embodiment of this application. Figure 1 shows a grade 0.5 B inclusion in the rolled material of the embodiment. Figure 2 shows a micrograph of wheel steel according to a comparative example of this application. Figure 2 shows a grade 2.0 B inclusion in the rolled material of Comparative Example 1. As can be seen from Figures 1 and 2, the inclusions in Figure 1 are fewer and smaller in volume than those in Figure 2, corresponding to the fatigue resistance properties in Embodiment 1 and Comparative Example 1.

[0079] Figure 3 is a schematic diagram of the morphology of Mg-Al inclusions and Mn / CaS composite inclusions using Example 1 of the present invention; Figure 4 is an energy dispersive spectroscopy (EDS) diagram of the peripheral Mn / CaS sulfide in Figure 3; Figure 5 is an EDS diagram of the core Mg-Al inclusion in Figure 3; Figure 6 is a schematic diagram of the morphology of pure MgO inclusions using Example 1 of the present invention; Figure 7 is an EDS diagram of the pure MgO inclusions in Figure 6.

[0080] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any skillful means or substitutions should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing steel for wheels, characterized in that, include: At the end of the LF furnace refining process, the refined steel in the LF furnace is subjected to a first-stage magnesium treatment to make the MgO mass percentage of inclusions in the refined steel reach 30% to 60%. The amount of magnesium added in the first-stage magnesium treatment is 0.1-0.2 kg / ton of steel. The refined steel is subjected to RH vacuum treatment to obtain RH refined steel liquid; wherein, at the end of the RH vacuum treatment, a second-stage magnesium treatment is performed to make the MgO mass percentage of inclusions in the RH refined steel liquid reach 61% to 100%, wherein the amount of magnesium added in the second-stage magnesium treatment is 0.35-0.5 kg / ton of steel. The RH vacuum treatment includes soft stirring at a flow rate of 100-300 L / min after the second magnesium treatment, and the soft stirring time is 5-10 min.

2. The preparation method according to claim 1, characterized in that, Before performing the first stage magnesium treatment on the refined steel in the LF furnace at the end of the LF furnace refining process, the method further includes: Molten steel is subjected to LF refining to obtain refined molten steel; wherein, the LF refining includes: adjusting the slag composition so that the mass percentage of Fe in the ladle refining slag at the end of LF furnace refining is <0.5%, the C / A ratio of the refining slag is 1.4~1.8, and the S in the molten steel is ≤0.0015%, wherein the C / A ratio represents the mass ratio of calcium oxide / alumina.

3. The preparation method according to claim 2, characterized in that, The adjustment of slag composition includes: adding lime, top slag modifier, and low-silicon pre-melted refining slag, wherein the composition of the top slag modifier by mass percentage is: Al: 32-47%, CaO: 18-25%, Al2O3: 17-28%, SiO2: 3-8%; The composition of the low-silicon pre-melted refining slag by mass percentage is as follows: CaO: 40-55%, Al2O3: 35-45%, SiO2: 2-7%, MgO: 3-7%.

4. The preparation method according to claim 3, characterized in that, The composition of the refining residue at the end of LF refining, expressed as a percentage by mass, includes: CaO: 48%–54%, SiO2: 4.4%–6%, P2O5: 0.02%–0.03%, Al2O3: 31%–35%, MgO: 6.0%–6.9%, MnO: 0–0.15%, FeTOT: 0.15%–0.5%, and unavoidable impurities; the mass ratio of CaO / SiO2 is 8.5–12.

5. The preparation method according to claim 1, characterized in that, Before performing the first stage magnesium treatment on the refined steel in the LF furnace, the method further includes: performing soft stirring at a flow rate of 200-400 L / min for 8-12 min.

6. The preparation method according to claim 1, characterized in that, The RH vacuum treatment includes: a vacuum degree of 5-7 kPa in the RH furnace, a vacuum treatment time of 15-20 min, and a flow rate of 80-100 Nm³ for the boosting gas. 3 / h.

7. The preparation method according to claim 1, characterized in that, The chemical composition of the RH molten steel, by mass percentage, includes 0.2wt%≤C≤0.4wt%, 0.1wt%≤Si≤0.4wt%, 0.4wt%≤Mn≤2.0wt%, S≤0.0015wt%, 0.01wt%≤Ti≤0.04wt%, 0.001wt%≤B≤0.005wt%, N≤0.005wt%, with the remainder being iron and other unavoidable impurities.

8. The manufacturing method according to any one of claims 1-7, characterized in that, The RH-refined molten steel is sequentially subjected to continuous casting, heating in a heating furnace, rough rolling, finish rolling, and heat treatment to obtain heat-treated steel plates.

9. A type of steel for wheels, characterized in that, It is prepared by the preparation method according to any one of claims 1 to 8.

10. The wheel steel according to claim 9, characterized in that, The inclusions in the steel used for wheels are classified according to GB / T 10561-2023, with Class B inclusions ≤ 1.0 grade and Class Ds inclusions ≤ 0.5 grade; the mechanical properties of the steel used for wheels meet the following requirements: yield strength ≥ 1000 MPa, tensile strength ≥ 1400 MPa, elongation ≥ 7%; the fatigue resistance of the steel used for wheels meets the following requirements: bending fatigue life ≥ 500,000 cycles, radial fatigue life ≥ 900,000 cycles.

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