High-nitrogen vanadium steel and preparation method thereof

Abstract

The invention provides high-nitrogen vanadium steel and a preparation method thereof.The preparation method comprises the following steps that raw materials of the high-nitrogen vanadium steel are subjected to converter smelting and ladle refining, and refined molten steel is prepared; the components of the refined molten steel contain nitrogen and vanadium; the refined molten steel is sequentially subjected to casting treatment and rolling treatment, and the high-nitrogen vanadium steel is prepared; wherein steel coke powder is added to the bottom of a steel ladle before ladle refining is carried out on molten steel obtained after converter smelting, and in the tapping process of converter smelting, the following steps are carried out: when 1 / 4 of the weight of steel is tapped, a silicon-aluminum-calcium deoxidizing agent is added to the steel flow, and when 2 / 3 of the weight of the steel is tapped, a silicon-manganese alloy and a high-carbon manganese-iron alloy are added to the steel flow; the temperature of the rolling treatment is 810-850 DEG C; according to the preparation method, the combination amount of nitrogen and vanadium can be increased, so that the mechanical property of the high-nitrogen vanadium steel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of alloys, in particular to a high-nitrogen vanadium steel and a preparation method thereof. Background Art

[0002] A large number of research results show that vanadium-nitrogen microalloying technology mainly optimizes the precipitation state of vanadium by taking advantage of the influence of nitrogen addition in steel on the precipitation kinetics of vanadium, thereby increasing the precipitation strengthening effect of vanadium, and doubling the number of V(CN) precipitation phases, thereby achieving the effect of fine grain strengthening and other effects, thereby improving the performance of steel.

[0003] Generally, in low-nitrogen vanadium steel, nearly 60% of the vanadium is solid-dissolved in the matrix, and only 35% precipitates as V(CN). In high-nitrogen vanadium steel, 70% precipitates as V(CN), and only 20% precipitates in the matrix. This indicates that when vanadium steel is deficient in nitrogen, due to the difference in nitrogen content, vanadium does not fully exert its precipitation strengthening effect, but mainly acts as solid solution strengthening. In high-nitrogen vanadium steel, vanadium preferentially combines with nitrogen, and most of it precipitates as V(CN). Vanadium mainly acts as precipitation strengthening, and the strengthening mechanism changes. Therefore, increasing nitrogen to change the distribution of vanadium and fully utilizing the precipitation strengthening effect of vanadium to improve the strength of steel is an important way to improve the strength of vanadium-containing steel. However, in the prior art, during the smelting process of nitrogen-containing vanadium steel, the combined amount of nitrogen and vanadium in the steel is inevitably reduced due to the influence of process conditions, thereby reducing the mechanical properties of the steel.

[0004] Therefore, traditional technologies still need to be improved. Summary of the Invention

[0005] Based on this, the present application provides a high nitrogen vanadium steel and a preparation method thereof, which can increase the binding amount of nitrogen and vanadium, thereby improving the mechanical properties of the high nitrogen vanadium steel.

[0006] The technical solution of this application is as follows.

[0007] In a first aspect of the present application, a method for preparing high nitrogen vanadium steel is provided, comprising the following steps:

[0008] The raw materials of high nitrogen vanadium steel are subjected to converter smelting and ladle refining to produce refined molten steel; the components of the refined molten steel contain nitrogen and vanadium;

[0009] The refined molten steel is sequentially subjected to casting and rolling processes to prepare high nitrogen vanadium steel;

[0010] Before the molten steel after the converter smelting is subjected to the ladle refining step, steel coke powder is added to the bottom of the ladle, and during the steel tapping process of the converter smelting, the following steps are performed:

[0011] When 1 / 4 of the steel is tapped, silicon-aluminum-calcium deoxidizer is added to the steel stream. When 2 / 3 of the steel is tapped, silicon-manganese alloy and high-carbon manganese-iron alloy are added to the steel stream.

[0012] The temperature of the rolling process is 810°C-850°C.

[0013] In the above-mentioned preparation method of high-nitrogen vanadium steel, before steel is tapped from a converter, steel coke powder is added to the bottom of the ladle, and during the tapping process, the order and amount of addition of silicon-aluminum-calcium deoxidizers are controlled to perform pre-deoxidation and reduce the oxidation of the steel slag. Silicon-manganese alloy and high-carbon manganese-iron alloy are further added to reduce the oxidizability of the molten steel, and then ladle refining and alloying are performed to reduce the oxidation of the steel slag while increasing the content of vanadium and nitrogen, so that the composition of the outgoing molten steel meets the outgoing requirements. The temperature of the rolling treatment is then controlled to increase the binding amount of nitrogen and vanadium, promote the precipitation of V(CN), and thus improve the mechanical properties of the high-nitrogen vanadium steel.

[0014] In some embodiments, during the ladle refining process, nitrogen blowing treatment is performed through a nitrogen pipeline at the bottom of the ladle, and the pressure of the nitrogen blowing treatment is 0.1Mpa to 1.35Mpa; further, the pressure of the nitrogen blowing treatment is greater than 1.3Mpa.

[0015] In some embodiments, the nitrogen blowing treatment lasts for 0.1 min to 15 min, and the flow rate is 0.1 to 2000 L / min.

[0016] In some embodiments, based on the total mass of the molten steel before tapping, the amount of the steel coke powder added is 0.25kg / t to 0.35kg / t, the amount of the silicon-aluminum-calcium deoxidizer added is 0.5kg / t to 2kg / t, the amount of the silicon-manganese alloy added is 8kg / t to 15kg / t, and the amount of the high-carbon manganese-iron alloy added is 6kg / t to 10kg / t.

[0017] In some embodiments, the refined steel contains 0.025%-0.031% vanadium and 0.014%-0.02% nitrogen.

[0018] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0019] C: 0.22%-0.25%, Si: 0.3%-0.4%, Mn: 1.0%-1.1%, V: 0.025%-0.031%, N: 0.014%-0.02% and the balance Fe.

[0020] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0021] C: 0.2356%, Si: 0.3512%, Mn: 1.051%, V: 0.0251%, N: 0.0152% and the balance Fe.

[0022] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0023] C: 0.2421%, Si: 0.321%, Mn: 1.0612%, V: 0.0255%, N: 0.0161% and the balance Fe.

[0024] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0025] C: 0.2401%, Si: 0.319%, Mn: 1.0235%, V: 0.026%, N: 0.017% and the balance Fe.

[0026] In a second aspect of the present application, a high nitrogen vanadium steel is provided, which is prepared using the above-mentioned method for preparing the high nitrogen vanadium steel. DETAILED DESCRIPTION

[0027] To facilitate understanding of the present application, the present application will be described in more detail below, along with preferred embodiments thereof. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure herein.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly indicate the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] The "ranges" disclosed in this application can be defined in the form of lower limits and upper limits. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. Ranges defined in this way can be inclusive or exclusive of the end values, any end value can be included or excluded independently, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 to 120 and 80 to 110 are listed for a particular parameter, it is understood that ranges of 60 to 110 and 80 to 120 are also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4, and 5 are also listed, the following ranges are all expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise specified, the numerical range "a to b" is an abbreviation for any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to listing the parameter as, for example, the integers 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and so on. For example, when a parameter is expressed as an integer selected from "2-10," this is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0031] In this application, the terms "optionally," "optional," and "optional" are optional and refer to either option being present or absent. If a technical solution contains multiple "options," each option is considered independent unless otherwise specified and there are no conflicts or constraints.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] One embodiment of the present application provides a method for preparing high nitrogen vanadium steel, comprising the following steps S10 to S20.

[0034] S10: The raw materials of the high nitrogen vanadium steel are subjected to converter smelting and ladle refining to produce refined molten steel; the components of the refined molten steel contain nitrogen and vanadium.

[0035] Before ladle refining the molten steel after converter smelting, steel coke powder is added to the bottom of the ladle, and during the steel tapping process of converter smelting, the following steps are performed:

[0036] When 1 / 4 of the steel weight is tapped, silicon-aluminum-calcium deoxidizer is added to the steel flow. When 2 / 3 of the steel weight is tapped, silicon-manganese alloy and high-carbon manganese-iron alloy are added to the steel flow.

[0037] S20: Casting and rolling the refined molten steel in sequence to prepare high nitrogen vanadium steel.

[0038] The temperature of the rolling process is 810°C-850°C.

[0039] In the above-mentioned preparation method of high-nitrogen vanadium steel, before steel is tapped from a converter, steel coke powder is added to the bottom of the ladle, and during the tapping process, the order and amount of addition of silicon-aluminum-calcium deoxidizers are controlled to perform pre-deoxidation and reduce the oxidation of the steel slag. Silicon-manganese alloy and high-carbon manganese-iron alloy are further added to reduce the oxidizability of the molten steel, and then ladle refining and alloying are performed to reduce the oxidation of the steel slag while increasing the content of vanadium and nitrogen, so that the composition of the outgoing molten steel meets the outgoing requirements. The temperature of the rolling treatment is then controlled to increase the binding amount of nitrogen and vanadium, promote the precipitation of V(CN), and thus improve the mechanical properties of the high-nitrogen vanadium steel.

[0040] Specifically, during the rolling process, the temperature of the upper cooling bed is controlled to be 810°C-850°C.

[0041] In some embodiments, during the ladle refining process, nitrogen blowing is performed through a nitrogen pipeline at the bottom of the ladle, and the pressure of the nitrogen blowing is greater than 1.3 MPa.

[0042] In some embodiments, the nitrogen blowing treatment time is 0.1 min to 15 min, and the flow rate is 0.1 to 2000 L / min.

[0043] Specifically, the pressure of the nitrogen blowing treatment is 1.3 MPa to 1.5 MPa.

[0044] In some embodiments, based on the total mass of molten steel before tapping, the amount of steel coke powder added is 0.25kg / t to 0.35kg / t, the amount of silicon-aluminum-calcium deoxidizer added is 0.5kg / t to 2kg / t, the amount of silicon-manganese alloy added is 8kg / t to 15kg / t, and the amount of high-carbon manganese-iron alloy added is 6kg / t to 10kg / t.

[0045] Specifically, the addition amount of the steel coke powder is 0.3 kg / t, the addition amount of the silicon-aluminum-calcium deoxidizer is 1 kg / t, the addition amount of the silicon-manganese alloy is 10 kg / t, and the addition amount of the high-carbon manganese-iron alloy is 8 kg / t.

[0046] In some embodiments, the high carbon ferromanganese alloy comprises, by mass percentage, 6.5% carbon, 75% manganese, 1.32% silicon, 0.11% phosphorus, 0.01% sulfur, and the balance iron.

[0047] In some embodiments, the raw materials of the high nitrogen vanadium steel include molten iron and scrap steel; before the smelting step, the molten iron and scrap steel are added to the smelting furnace.

[0048] In some embodiments, during the refining process, vanadium-nitrogen alloy, silicon-manganese alloy and silicon-ferroalloy are added to the molten steel after smelting; further, nitrogen is blown from the refining high-pressure bottom.

[0049] In some embodiments, the silicon-manganese alloy comprises, by mass percentage, 1.64% carbon, 66% manganese, 17.54% silicon, 0.16% phosphorus, 0.03% sulfur, and the balance iron.

[0050] In some embodiments, the ferrosilicon alloy comprises, by mass percentage, 73.16% silicon, 0.08% carbon, 0.03% phosphorus, 0.01% sulfur, and the balance iron.

[0051] In some embodiments, the composition of the vanadium-nitrogen alloy includes, by mass percentage, 75% vanadium, 14% nitrogen, 4% carbon, and the remainder Fe.

[0052] In some specific embodiments, the mass ratio of molten iron to scrap steel is (80-85): (20-25); further, based on the total mass of molten steel after smelting treatment and before tapping, the addition amount of vanadium-nitrogen alloy is 0.3-0.4 kg / t, the addition amount of silicon-manganese alloy is 1.9-2.5 kg / t, and the addition amount of ferrosilicon alloy is 5.9-7 kg / t.

[0053] In some of these embodiments, the refined steel contains 0.025% to 0.031% vanadium and 0.014% to 0.02% nitrogen.

[0054] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0055] C: 0.22%-0.25%, Si: 0.3%-0.4%, Mn: 1.0%-1.1%, V: 0.025%-0.031%, N: 0.014%-0.02% and the balance Fe.

[0056] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0057] C: 0.2356%, Si: 0.3512%, Mn: 1.051%, V: 0.0251%, N: 0.0152% and the balance Fe.

[0058] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0059] C: 0.2421%, Si: 0.321%, Mn: 1.0612%, V: 0.0255%, N: 0.0161% and the balance Fe.

[0060] In some embodiments, the components of the refined molten steel include, by mass percentage:

[0061] C: 0.2401%, Si: 0.319%, Mn: 1.0235%, V: 0.026%, N: 0.017% and the balance Fe.

[0062] It can be understood that the composition of the refined molten steel represents the composition of the produced high nitrogen vanadium steel.

[0063] Another embodiment of the present application provides a high nitrogen vanadium steel, which is prepared using the above-mentioned preparation method of the high nitrogen vanadium steel.

[0064] This high nitrogen vanadium steel has high yield strength.

[0065] The present application will be described below in conjunction with specific embodiments, but the present application is not limited to the following embodiments. It should be understood that the attached claims summarize the scope of the present application. Under the guidance of the concept of the present application, those skilled in the art should realize that certain changes made to the various embodiments of the present application will be covered by the spirit and scope of the claims of the present application.

[0066] The following are specific examples.

[0067] Example 1

[0068] (1) 80 tons of molten iron is placed in a 100 tons converter, 25 tons of scrap steel is added, and top-blown oxygen dephosphorization is performed to obtain crude molten steel that meets the requirements. The converter tapping temperature is 1580°C.

[0069] (2) Before the molten steel is subjected to the step of ladle refining, steel coke powder is added to the bottom of the ladle, and during the converter tapping process: when 1 / 4 of the weight of the steel is tapped, a silicon-aluminum-calcium deoxidizer is added to the steel flow, and when 2 / 3 of the weight of the steel is tapped, a silicon-manganese alloy and a high-carbon manganese-ferroalloy are added to the steel flow. Based on the total mass of the molten steel before tapping, the amount of steel coke powder added is 0.3 kg / t, the amount of silicon-aluminum-calcium deoxidizer added is 1 kg / t, the amount of silicon-manganese alloy added is 10 kg / t, and the amount of carbon-manganese-ferroalloy added is 8 kg / t; the ladle refining temperature is 1540°C, and during the refining process, 0.38 kg / t of vanadium-nitrogen alloy, 2 kg / t of silicon-manganese alloy, and 6.5 kg / t of ferrosilicon alloy are added, and nitrogen is blown from the refining high-pressure bottom: pressure 1.31 MPa, time 6 minutes, to obtain refined molten steel, and the smelting end temperature is 1570°C.

[0070] (3) The refined molten steel is cast and then rolled on a cooling bed at a temperature of 846°C to obtain φ14 specification high nitrogen vanadium steel.

[0071] (4) Samples of refined molten steel were taken for testing and analysis of its components, as shown in Table 1. The yield strength of the obtained high nitrogen vanadium steel was tested with reference to the standard GB1499.2-2024, and the yield strength was 445 MPa.

[0072] Table 1

[0073] Element C Si Mn V N Te content / % 0.2356 0.3512 1.051 0.0251 0.0152 margin

[0074] Example 2

[0075] (1) 82 tons of molten iron was placed in a 100 tons converter, 23 tons of scrap steel was added, and top-blown oxygen dephosphorization was performed to obtain crude steel that met the requirements. The converter tapping temperature was 1591°C.

[0076] (2) Before the molten steel is subjected to the step of ladle refining, steel coke powder is added to the bottom of the ladle, and during the converter tapping process: when 1 / 4 of the weight of the steel is tapped, a silicon-aluminum-calcium deoxidizer is added to the steel flow, and when 2 / 3 of the weight of the steel is tapped, a silicon-manganese alloy and a high-carbon manganese-ferroalloy are added to the steel flow. Based on the total mass of the molten steel before tapping, the amount of steel coke powder added is 0.3 kg / t, the amount of silicon-aluminum-calcium deoxidizer added is 1 kg / t, the amount of silicon-manganese alloy added is 10 kg / t, and the amount of high-carbon manganese-ferroalloy added is 8 kg / t; the ladle refining temperature is 1535°C, and during the refining process, 0.35 kg / t of vanadium-nitrogen alloy, 2.2 kg / t of silicon-manganese alloy, and 6.7 kg / t of ferrosilicon alloy are added, and nitrogen is blown from the refining high-pressure bottom: pressure 1.3 MPa, time 4 min, to obtain refined molten steel, and the smelting end temperature is 1566°C.

[0077] (3) The refined molten steel is cast and then rolled on a cooling bed at a temperature of 821°C to obtain φ14 specification high nitrogen vanadium steel.

[0078] (4) Samples of refined molten steel were taken and their components were tested and analyzed, as shown in Table 2. The yield strength of the obtained high nitrogen vanadium steel was tested, and the yield strength was 440 MPa.

[0079] Table 2

[0080] Element C Si Mn V N Fe content / % 0.2421 0.321 1.0612 0.0255 0.0161 margin

[0081] Example 3

[0082] (1) 80 tons of molten iron is placed in a 100 tons converter, 25 tons of scrap steel is added, and top-blown oxygen dephosphorization is performed to obtain crude molten steel that meets the requirements. The converter tapping temperature is 1577°C.

[0083] (2) Before the molten steel is subjected to the step of ladle refining, steel coke powder is added to the bottom of the ladle, and during the process of tapping from the converter: when 1 / 4 of the weight of the steel is tapped, a silicon-aluminum-calcium deoxidizer is added to the steel flow, and when 2 / 3 of the weight of the steel is tapped, a silicon-manganese alloy and a high-carbon manganese-ferroalloy are added to the steel flow. Based on the total mass of the molten steel before tapping, the amount of steel coke powder added is 0.3 kg / t, the amount of silicon-aluminum-calcium deoxidizer added is 1 kg / t, the amount of silicon-manganese alloy added is 10 kg / t, and the amount of high-carbon manganese-ferroalloy added is 8 kg / t; the temperature of the ladle refining is 1542°C, and during the refining process, 0.35 kg / t of vanadium-nitrogen alloy, 1.9 kg / t of silicon-manganese alloy, and 6.7 kg / t of ferrosilicon alloy are added, and nitrogen is blown from the refining high-pressure bottom: pressure 1.33 MPa, time 7 minutes, to obtain refined molten steel, and the smelting end temperature is 1568°C.

[0084] (3) The refined molten steel is cast and then rolled on a cooling bed at a temperature of 830°C to obtain φ14 specification high nitrogen vanadium steel.

[0085] (4) Samples of refined molten steel were taken and their components were tested and analyzed, as shown in Table 3. The yield strength of the obtained high nitrogen vanadium steel was tested, and the yield strength was 450 MPa.

[0086] Table 3

[0087] Element C Si Mn V N Fe content / % 0.2401 0.319 1.0235 0.026 0.017 margin

[0088] Tables 1 to 3 above and the test results show that the high nitrogen vanadium steel prepared by the high nitrogen vanadium steel preparation method has a high yield strength.

[0089] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above embodiments merely illustrate several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of this patent shall be determined by the appended claims.

Claims

1. A method for preparing high nitrogen vanadium steel, characterized in that: The steps include: The raw materials of high nitrogen vanadium steel are subjected to converter smelting and ladle refining to produce refined molten steel; the components of the refined molten steel contain nitrogen and vanadium; The refined molten steel is sequentially subjected to casting and rolling processes to prepare high nitrogen vanadium steel; Before the molten steel after the converter smelting is subjected to the ladle refining step, steel coke powder is added to the bottom of the ladle, and during the steel tapping process of the converter smelting, the following steps are performed: When 1 / 4 of the steel is tapped, silicon-aluminum-calcium deoxidizer is added to the steel stream. When 2 / 3 of the steel is tapped, silicon-manganese alloy and high-carbon manganese-iron alloy are added to the steel stream. The temperature of the rolling process is 810°C-850°C.

2. The method for preparing high nitrogen vanadium steel according to claim 1, wherein: During the ladle refining process, nitrogen blowing treatment is performed through the nitrogen pipeline at the bottom of the ladle, and the pressure of the nitrogen blowing treatment is 0.1Mpa to 1.35Mpa.

3. The method for preparing high nitrogen vanadium steel according to claim 2, wherein: The nitrogen blowing treatment time is 0.1 min to 15 min, and the flow rate is 0.1 to 2000 L / min.

4. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: Based on the total mass of the molten steel before tapping, the addition amount of the steel coke powder is 0.25kg / t to 0.35kg / t, the addition amount of the silicon-aluminum-calcium deoxidizer is 0.5kg / t to 2kg / t, the addition amount of the silicon-manganese alloy is 8kg / t to 15kg / t, and the addition amount of the high-carbon manganese-iron alloy is 6kg / t to 10kg / t.

5. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: The refined molten steel contains 0.025%-0.031% vanadium and 0.014%-0.02% nitrogen.

6. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: The components of the refined molten steel include, by mass percentage: C: 0.22%-0.25%, Si: 0.3%-0.4%, Mn: 1.0%-1.1%, V: 0.025%-0.031%, N: 0.014%-0.02% and the balance Fe.

7. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: The components of the refined molten steel include, by mass percentage: C: 0.2356%, Si: 0.3512%, Mn: 1.051%, V: 0.0251%, N: 0.0152% and the balance Fe.

8. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: The components of the refined molten steel include, by mass percentage: C: 0.2421%, Si: 0.321%, Mn: 1.0612%, V: 0.0255%, N: 0.0161% and the balance Fe.

9. The method for preparing high nitrogen vanadium steel according to any one of claims 1 to 3, characterized in that: The components of the refined molten steel include, by mass percentage: C: 0.2401%, Si: 0.319%, Mn: 1.0235%, V: 0.026%, N: 0.017% and the balance Fe.

10. A high nitrogen vanadium steel, characterized in that: The high nitrogen vanadium steel is prepared by the preparation method of any one of claims 1 to 9.