A high-molybdenum super-high-manganese steel material and a production process thereof

Abstract

The application discloses a production process of high-molybdenum super-high-manganese steel material, which comprises the following steps: (1) knotting the crucible of basic material (fused magnesite) of medium-frequency furnace; (2) preparing material; (3) charging and smelting slagging material; (4) adjusting chemical composition; (5) purifying in the furnace; (6) making new slag; (7) controlling temperature and tapping; (8) inoculation treatment; (9) second purification treatment in the ladle; and (10) temperature measurement and pouring. Through optimization of components and process, the mechanical properties of the high-molybdenum super-high-manganese steel material produced by the application can reach: tensile strength σb≥740.6 MPa; yield strength σs≥481.2 MPa; elongation δ≥25.6%; impact toughness αk≥120.3 J (U-shaped notch), initial hardness ≥222.5 HB, and oxygen content <20 ppm. The high-molybdenum super-high-manganese steel material produced by the application has excellent mechanical properties and can meet the production requirements of thick-section super-high-manganese steel castings.

Description

Technical Field

[0001] This invention belongs to the field of new material production technology, specifically relating to a high-molybdenum ultra-high-manganese steel material and its production process. Background Technology

[0002] The main characteristics of high-manganese steel are its good toughness and plasticity after water quenching, as well as its work hardening properties, making it an irreplaceable material in wear-resistant applications. However, its biggest drawbacks are low strength, susceptibility to rheology, low initial hardness, and poor performance in large-section castings.

[0003] Currently, the main smelting equipment for producing high-manganese steel is still the medium-frequency induction furnace. Since it lacks smelting capabilities, researching its purification process is an important direction for high-manganese steel research and development. Regarding improving the strength of high-manganese steel, conventional research involves alloying, adding certain amounts of carbide-forming elements or solid solution strengthening elements such as chromium, molybdenum, nickel, vanadium, and titanium, which has yielded some results. However, for castings with thick cross-sections (thickness exceeding 150 mm) and castings requiring both high strength and high toughness (such as large hammer crusher hammers and crusher wall panels used for crushing scrap cars, and large Rp cement mill rollers), a suitable solution has not yet been found.

[0004] Current problems in the production of high-molybdenum and ultra-high-manganese steel

[0005] 1. Oxidation problem during the smelting of ultra-high manganese steel:

[0006] Manganese is a reactive metal that is easily oxidized during smelting to form oxides. Some of these oxides enter high-manganese steel, forming oxide inclusions that severely affect its performance. This is especially true during the smelting of ultra-high-manganese steel, where manganese oxidation is even more severe. Ensuring that manganese is not excessively oxidized, or that it can be promptly reduced after oxidation, is a key technology in the production of ultra-high-manganese steel.

[0007] 2. Guarantee of the mechanical properties of ultra-high manganese steel:

[0008] Manganese promotes austenite formation, combining with carbon to obtain a single-phase austenitic structure. Too low a manganese content fails to meet the requirements for austenite formation, while too high a content not only offers no significant benefit to mechanical properties but also easily leads to coarse columnar crystals and crack formation. Therefore, the manganese content range used in conventional high-manganese steel is 10-14%. Since ultra-high-manganese steel contains over 25% manganese, ensuring its mechanical properties under ultra-high manganese content conditions is a key technology in its production.

[0009] 3. How to solve the performance stability problem of thick cross-section castings:

[0010] Ultra-high manganese steel solidifies in a paste-like manner, exhibiting a strong tendency for austenite dendrite growth during solidification. The slow cooling rate of thick, large-section castings further exacerbates this tendency, resulting in coarse grains and castings that fail to meet technical specifications. Therefore, effectively refining the grain size and inhibiting dendrite growth are key technologies for producing thick, large ultra-high manganese steel castings. Summary of the Invention

[0011] This invention provides a production process for high-molybdenum and ultra-high-manganese steel materials to solve the problems currently existing in the production of high-molybdenum and ultra-high-manganese steel.

[0012] The present invention adopts the following technical solution:

[0013] A production process for high-molybdenum and ultra-high-manganese steel includes the following steps:

[0014] (1) Knotting the crucible for alkaline materials (fused magnesia) in medium frequency furnace: After preparing the materials according to the requirements of the medium frequency furnace lining material and furnace collar material, use a mold to knot the crucible, and then dry and sinter it;

[0015] (2) Prepare materials: Weigh the raw materials according to the chemical composition requirements of ultra-high manganese steel and set them aside;

[0016] (3) Charging and slag-forming material smelting: The prepared raw materials are gradually fed into the medium frequency furnace for smelting. During the smelting process, the surface of the ultra-high manganese steel is covered with slag-forming material until the furnace charge is melted and the furnace composition is sampled and analyzed.

[0017] (4) Adjust the chemical composition: Based on the sampling analysis results, adjust the added material until it is completely melted;

[0018] (5) Furnace purification: After the ultra-high manganese steel in the furnace reaches the required temperature, the power is cut off and the furnace is calmed. At this time, a purification device is used to blow argon gas for purification, so that the high molybdenum and high manganese steel is uniform in temperature and quality, and impurities and gases are fully floated to the surface and fully fused with the slag-forming material.

[0019] (6) Making new slag: After the furnace purification is completed, the furnace is powered on and heated to the specified temperature and kept at that temperature. At this time, the slag on the surface of the molten steel is removed and new slag is made according to the requirements of the slag making material.

[0020] (7) Temperature-controlled tapping: After the new slag has completely formed a molten state, measure the temperature of the molten steel and tap the high-manganese molten steel;

[0021] (8) Pregnancy treatment;

[0022] (9) Second purification treatment inside the ladle: Place the ladle in a designated location and purify it with argon gas;

[0023] (10) Temperature measurement and casting: Measure the temperature of the molten steel, select the casting temperature according to the size of the casting, and then cast the casting. After quenching, the casting is made into high molybdenum and ultra-high manganese steel material.

[0024] Furthermore, the furnace lining material mentioned in step (1) is made by mixing 0-4 mm fused magnesia, 4-6 mm fused magnesia, fused magnesia powder, boric acid, and water.

[0025] Furthermore, the furnace collar material mentioned in step (1) is made by mixing 0-3 mm fused magnesia, 4-6 mm fused magnesia, fused magnesia powder, water glass and refractory clay.

[0026] Furthermore, in step (5), the argon gas blowing pressure is 0.1-0.3 MPa, and the purification time is 3-5 min.

[0027] Furthermore, the temperature specified in step (6) is 1580-1600℃.

[0028] Furthermore, the incubation process in step (8) includes the following steps:

[0029] 1) Preheating treatment of the inoculant: Weigh the inoculant and then dry it to ensure that the inoculant is fully dried;

[0030] 2) Place the preheated inoculant at the bottom of the ladle and compact it;

[0031] 3) Inoculation treatment of molten steel: molten steel is discharged according to the total amount of molten steel discharged from the furnace.

[0032] Furthermore, the inoculant accounts for 2.7-3.2% of the total amount of molten steel produced.

[0033] Furthermore, the drying process involves placing the inoculant near the furnace opening for preheating for more than 10 minutes or placing it in a heating furnace at 280-350℃ for 1-3 hours.

[0034] Furthermore, in step (9), argon gas is introduced for purification. The argon gas pressure is 0.1-0.3 MPa and the purification time is 3-5 min.

[0035] The present invention also provides a high-molybdenum ultra-high-manganese steel material, which, by mass percentage, comprises the following components: 1.30-1.50% carbon, 0.40-1.00% silicon, 25.00-28.00% manganese, 1.50-2.500% molybdenum, not more than 0.06% phosphorus, not more than 0.03% sulfur, and the total amount of nickel, vanadium, titanium and copper is less than 1.0%, with the balance being Fe.

[0036] The present invention has the following beneficial effects:

[0037] (1) The present invention uses two argon gas purification treatments to molten steel, which significantly reduces the oxygen content of the obtained high molybdenum and ultra-high manganese steel material and significantly improves the mechanical properties of the obtained high molybdenum and ultra-high manganese steel material.

[0038] (2) The mechanical properties of the high molybdenum and ultra-high manganese steel produced by this invention can reach: tensile strength σb≥740.6MPa; yield strength σs≥481.2MPa; elongation δ≥25.6%; impact toughness αk≥120.3J (U-notch); initial hardness≥222.5HB; oxygen content<20ppm. The high molybdenum and ultra-high manganese steel produced by this invention has excellent mechanical properties and can meet the production requirements of thick and large cross-section ultra-high manganese steel castings. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a simplified purification device according to the present invention. Detailed Implementation

[0040] To facilitate a better understanding of the present invention, the following embodiments are provided. These embodiments are within the scope of protection of the present invention, but do not limit the scope of protection of the present invention.

[0041] I. Solution of the Invention

[0042] Under the conditions of a conventional medium-frequency induction furnace, by selecting furnace lining materials, optimizing the alloy composition, designing ultra-high manganese steel slag, inoculation treatment, and purifying molten steel, the wear resistance and uniformity of the performance of thick and large cross sections of ultra-high manganese steel can be improved while ensuring the mechanical properties of ultra-high manganese steel.

[0043] 1. By using high molybdenum content, the morphology and distribution of carbides in high-manganese steel are addressed, thereby improving the uniformity of material properties in thick and large cross-section castings;

[0044] 2. Increase the manganese content to produce ultra-high manganese materials with a manganese content of up to 25% or more, which mainly solves the problems of insufficient strength, low initial hardness, and low work hardening rate of ordinary high manganese steel.

[0045] 3. A simple purification device for smelting ultra-high manganese steel, which purifies the molten steel by passing inert gas through the smelting process and in the ladle;

[0046] 4. Prepare suitable slag to protect the molten steel surface and reduce the oxide slag caused by excessive oxidation due to ultra-high manganese during the smelting process of ultra-high manganese steel;

[0047] 5. Prepare inoculation treatment materials to inoculate ultra-high manganese steel, thereby improving its comprehensive performance.

[0048] II. Selection of Main Chemical Components and Processes

[0049] 1. Chemical composition range (%):

[0050]

[0051] 2. Incubation treatment:

[0052] It is mainly composed of heavy rare earth silicon, heavy rare earth magnesium, barium-calcium alloy, vanadium-titanium alloy, etc.

[0053] 3. Two-stage argon purification process (inside the furnace and inside the package):

[0054] The medium-frequency furnace melting and argon gas blowing protection device for molten steel ladle of the present invention are adopted.

[0055] III. Principles and Basis

[0056] 1. Selection of molybdenum:

[0057] (1) Solid solubility of molybdenum in steel materials:

[0058] Molybdenum metal has a melting point of 2620℃. In the iron-molybdenum phase diagram, molybdenum and iron are mutually soluble. In steel materials, molybdenum is soluble in both α-iron and γ-iron. At room temperature, the solubility of molybdenum in α-iron is 8-9%, and the solubility increases with increasing temperature. Molybdenum raises the A3 point of iron and lowers the A4 point. When the molybdenum content is 2.5-3.0%, the γ-iron region is closed. In high-manganese steel materials, molybdenum can dissolve in austenite and cementite.

[0059] (2) Forms of molybdenum in high-manganese steel:

[0060] When molybdenum solidifies in austenitic manganese steel, part of it dissolves in austenite, while some is distributed in carbides. Due to the strong bonding ability of molybdenum and carbon, high molybdenum content can form special carbides such as molybdenum carbide, dimolybdenum carbide, and molybdenum compounds (MoC, Mo2C, Mo23C6). Molybdenum can also form complex cementite with iron and carbon. Molybdenum's ability to form carbides is greater than that of manganese and chromium, but less than that of tungsten, vanadium, and titanium.

[0061] (3) The effect of molybdenum on the solidification process of high-manganese steel:

[0062] During the high-temperature solidification of high-manganese steel, molybdenum partially dissolves in austenite, partially distributes in carbides, and forms molybdenum carbides. When dissolved in austenite, molybdenum inhibits austenite decomposition and improves the tendency of austenite to grow along dendrites, thus enhancing the stability of austenite. Molybdenum also inhibits carbide precipitation and promotes pearlite formation. Because molybdenum diffuses much slower in steel than carbon, the dissolution rate of carbides in steel is slowed down; this rate becomes very slow when the molybdenum content exceeds 0.5%. Molybdenum also alters the morphology of carbides. Needle-like carbides are rarely found in molybdenum-containing steels; they are often found in blocky or granular forms.

[0063] (4) The role of molybdenum in high manganese steel:

[0064] Molybdenum (Mo) plays a crucial role in steel alloying primarily in two aspects: First, it influences the microstructure by shrinking the γ-phase region. As a carbide-forming element, some Mo forms a solid solution with iron, while others form carbides with carbon. The solubility of Mo in α-iron is 37.5% (1450°C) and 4% (1150°C), respectively. Second, it affects material properties. Molybdenum strongly inhibits the transformation of austenite to pearlite, thereby improving the hardenability of steel. Steels containing around 0.5% Mo can reduce or resist temper brittleness caused by other alloying elements. At higher tempering temperatures, it forms dispersed special carbides, which have a secondary hardening effect, improving the steel's hot strength and creep strength. When the Molybdenum content in steel is 2%-3%, it increases the steel's corrosion resistance.

[0065] 1) Improve the mechanical properties of high-manganese steel

[0066] Molybdenum dissolved in the matrix of high-manganese steel can strengthen it, increasing its hardness and strength. Adding an appropriate amount of molybdenum can significantly improve the yield strength, tensile strength, and elongation of the steel, achieving a relative balance between strength and toughness. While significantly increasing the yield strength, molybdenum does not reduce toughness, and may even improve it. The molybdenum content in steel is generally below 2%. In the as-cast state, molybdenum reduces grain boundary carbides, thus decreasing brittleness. After heat treatment, when the molybdenum content in the steel is below 2%, the yield strength increases, while the tensile strength and ductility do not decrease.

[0067] 2) Improve the thermal stability of high-manganese steel:

[0068] The molybdenum content in high-manganese steel is generally less than 2%. During the solidification of austenitic manganese steel, molybdenum partially dissolves in austenite and partially distributes in carbides. It can improve the tendency of austenite to grow along dendrites and enhance the stability of austenite. It can also inhibit carbide precipitation and pearlite formation. Therefore, the addition of molybdenum has a good effect on improving the crack resistance and water quenching quality of large-section castings. It also has a good effect on preventing embrittlement during welding, cutting, or at temperatures above 275℃.

[0069] 3) Effect on the wear resistance of high manganese steel:

[0070] When molybdenum is added, it dissolves in austenite during water quenching, acting as an alloying agent. Precipitation strengthening treatment can also be used to precipitate dispersed carbides from austenite, strengthening the austenite and improving wear resistance. Simultaneously, the large amount of molybdenum dissolved in austenite and the compounds formed by it increase the strength and initial hardness of the matrix, thus improving the wear resistance of high-manganese steel.

[0071] Molybdenum alters the morphology of carbides, resulting in fewer needle-like carbides and more blocky or granular carbides in molybdenum-containing high-manganese steel. Because the cast carbides are fewer in number and have a more favorable distribution and morphology, the carbon content in the steel can be increased without causing excessive carbide formation. Increased carbon content effectively improves the wear resistance of high-manganese steel. Molybdenum can also refine the microstructure of water-quenched steel, enabling molybdenum-containing high-manganese steel to maintain good wear resistance even under harsh abrasive wear conditions.

[0072] 4) Improve the corrosion resistance of high-manganese steel

[0073] Molybdenum plays a vital role in corrosion resistance in metals. Adding molybdenum can improve the acid and alkali resistance of metals, reduce corrosion rates and losses in acidic and alkaline environments, and better protect the performance and lifespan of metallic materials.

[0074] 5) Molybdenum can improve the thermal stability and high-temperature resistance of high-manganese steel.

[0075] Molybdenum possesses excellent thermal stability and high-temperature resistance, which can improve the thermal deformation and high-temperature creep behavior of metals, preventing deformation, cracking, and failure of metallic materials at high temperatures. Adding an appropriate amount of molybdenum can improve the thermal stability and high-temperature resistance of steel, allowing it to maintain a certain level of strength and toughness even at high temperatures.

[0076] Therefore, the addition of molybdenum to high-manganese steel has a good effect on improving the crack resistance and water quenching quality of large-section castings, and also has a good effect on preventing embrittlement during welding, cutting, or at temperatures above 275℃. After adding an appropriate amount of molybdenum to high-manganese steel, water quenching can be used to dissolve the molybdenum in austenite, thereby achieving an alloying effect. Precipitation strengthening treatment can also be used to precipitate dispersed carbides in austenite, thus strengthening the steel and improving its wear resistance.

[0077] IV. Solutions to problems encountered in the production of high-molybdenum and ultra-high-manganese steel:

[0078] 1. Optimized ingredient design:

[0079] (1) Selection of manganese carbon content and manganese carbon ratio:

[0080] In ordinary high-manganese steel, the carbon content is generally selected between 0.9% and 1.5%, and the manganese content is generally selected between 10% and 14%. The ratio of manganese to carbon in high-manganese steel is called the manganese-carbon ratio, and the common manganese-carbon ratio of high-manganese steel is 10-12. The manganese-carbon ratio of high-manganese steel affects its comprehensive properties such as plasticity, toughness, and strength. In applications with high wear and impact stress, a lower manganese-carbon ratio can improve the plasticity and toughness of high-manganese steel; in applications with low wear and impact stress, a higher manganese-carbon ratio can improve hardness and strength, and increase wear resistance.

[0081] According to the design of the present invention, the carbon content of the ultra-high manganese steel is selected as 1.30-1.50%, the manganese content is selected as 25-28%, and the manganese-carbon ratio is selected as 19-21.

[0082] (2) Selection of molybdenum content:

[0083] Based on the role of molybdenum, its state of existence in high-manganese steel, its solid solubility and its impact on high-manganese steel, and economic factors, the molybdenum content selected in this invention is 1.5-2.5%.

[0084] (3) Selection of other elements:

[0085] Other elements are selected according to the composition requirements of ordinary high-manganese steel, with appropriate amounts of trace elements such as nickel, vanadium, titanium, and copper added, the total amount controlled within 1.0%. Specific composition selections are shown in the table below:

[0086]

[0087] 2. Selection and preparation of lining materials for medium-frequency furnaces:

[0088] Because high-molybdenum and ultra-high-manganese steel has a high manganese content and suffers from severe oxidation of alloying elements, deoxidation and slag removal are necessary. Since manganese and its oxides are alkaline materials, the smelting of high-molybdenum and ultra-high-manganese steel requires the use of alkaline furnace lining materials (fused magnesia). This invention selects a suitable fused magnesia furnace lining material with a suitable formulation. The particle size distribution of the fused magnesia (which can be adjusted according to the capacity of the medium-frequency furnace) is as follows:

[0089] Furnace lining material: 45% 0-4 mm fused magnesia, 23% 4-6 mm fused magnesia, 30% fused magnesia powder, 2% boric acid. Add an appropriate amount of water to the above components during preparation.

[0090] Furnace material: 60% 0-3 mm fused magnesia, 10% 4-6 mm fused magnesia, 30% fused magnesia powder. During preparation, add appropriate amounts of water glass and refractory clay to the above components.

[0091] 3. Selection and preparation of probiotics;

[0092] (1) Optimization of progesterone composition and ratio:

[0093] Rare earth magnesium alloy (74% magnesium, 26% rare earth) 21%, rare earth ferrosilicon alloy (26% rare earth, 38% Si) 32%, niobium iron (75% niobium) powder 7%, silicon calcium (55% silicon, 26% calcium) powder 4%, silicon calcium barium (52% Si, 10% Ca, 10% Ba) powder 10%, silicon calcium barium aluminum (46% Si, 10% Ca, 10% Ba, 13% Al) powder 10%, vanadium iron (45% vanadium) powder 3%, titanium iron (55% titanium) powder 3%, molybdenum iron (60% molybdenum) powder 4%, chromium nitride iron powder 5%, tungsten iron (55% tungsten) powder 1%.

[0094] (2) Preparation of progestin:

[0095] 1) Ingredients: Weigh all the raw materials in the formula according to the weight ratio, and mix all the powders evenly to obtain the mixture.

[0096] 2) Melting and granulation: The mixture is put into a vacuum induction furnace for melting. After reaching the specified temperature, it is discharged from the furnace through an intermediate ladle. When the liquid mixture flows out of the intermediate ladle, an air pressure of 82 m / s is applied to it. The liquid raw material is broken and cooled by strong wind. Under the action of liquid surface tension, inoculant particles with a spherical or near-spherical shape are obtained. After sieving, inoculant with standard particle size is obtained.

[0097] This invention primarily addresses the challenges of poor performance caused by coarse grains and numerous microscopic voids during the paste-like solidification process of thick-section ultra-high manganese steel. It addresses these issues by increasing the number of high-melting-point alloy compound nuclei formed during the solidification process and purifying grain boundaries. The optimized inoculant used in this invention readily forms high-melting-point compounds, promoting the nucleation of primary compounds in the ultra-high manganese steel and increasing their number. Furthermore, rare earth elements, barium, calcium, aluminum, and other alloying elements accumulate on the surface of the primary compounds, further purifying grain boundaries, refining the grains, and hindering the growth of dendritic crystals. In the production of ultra-high manganese steel, treatment with this inoculant significantly increases the number of primary high-melting-point compounds, thereby refining the grains and purifying grain boundaries. This improves the overall performance and stability of thick-section ultra-high manganese steel castings, ultimately enhancing their wear resistance.

[0098] 3. Selection and preparation of slag-forming materials:

[0099] (1) Selection of slag-forming materials:

[0100] The main functions of slag include preventing secondary oxidation of molten steel and reducing some oxidized metal oxides back to metal. When reducing synthetic slag comes into contact with molten steel that has not been deoxidized or is incompletely deoxidized, emulsification in the molten steel causes a rapid increase in the steel-slag interface, allowing dissolved oxygen in the steel to diffuse into the slag, thereby deoxidizing the molten steel and preventing secondary oxidation. The main function of CaO is to increase the basicity of the slag, thereby accelerating the combination with sulfur in the steel and thus removing sulfur. The main function of CaF2 is to lower the melting temperature of the refining slag, increase its fluidity, and create favorable kinetic conditions for the desulfurization reaction. Barium aluminate and calcium silicate can desulfurize. In addition, due to the strong carrying capacity of Al2O3, a large amount of lime and foaming agents can be added to form a refining slag with strong desulfurization ability. The slag system formed by CaO and Al2O3 has the characteristics of high basicity, low oxygen potential, and strong desulfurization ability. The slag with SiO2 has a strong desulfurization ability, but in the production of high molybdenum and ultra-high manganese steel, the silicon content must be controlled. To avoid severe silicon reversion, the W (SiO2) in the slag must be controlled. Because ultra-high manganese steel has a high manganese content, manganese is easily oxidized and lost, making the selection of components for high-performance slag-forming materials extremely important. CaO, produced by the thermal decomposition of calcium carbonate powder, is an alkaline oxide that can increase the alkalinity of the slag-forming material, enhancing its desulfurization and dephosphorization capabilities. Palaequefoil possesses strong adsorption capacity and a relatively large specific surface area, making it a heat-insulating material, a low-melting-point material, and exhibiting excellent rheological and catalytic properties. It is also a good adsorbent material, beneficial for adsorbing impurities such as oxygen from molten iron. Water glass has good viscosity and is used as a binder in this invention. After the high-performance slag-forming material melts, the synergistic effect of CaO, CaF2, Al2O3, and SiO2 can significantly reduce the sulfur content of ultra-high manganese steel and improve the product's mechanical properties.

[0101] Based on its compositional characteristics, the slag-forming materials of this invention are optimized and selected as follows:

[0102] The following raw materials are included in parts by weight: 67 parts calcium oxide powder, 19 parts calcium fluoride powder, 38 parts alumina powder, 23 parts silicate powder, 27 parts calcium silicate powder, 18 parts calcium carbonate powder, 5 parts barium aluminate powder, 14 parts palygorskite powder, 8 parts montmorillonite powder, and 5 parts water glass.

[0103] The quality indicators of the calcium oxide powder are: CaO: 95.3%; S: 0.02%;

[0104] The quality indicators of the calcium fluoride powder are: CaF2: 80.65%, particle size: 1000 mesh;

[0105] The alumina powder has a particle size of 1000 mesh;

[0106] The silica powder has a particle size of 900 mesh;

[0107] The calcium silicate powder has a particle size of 1100 mesh;

[0108] The calcium carbonate powder has a particle size of 1000 mesh;

[0109] The barium aluminate powder has a particle size of 1000 mesh;

[0110] The quality indicators of the palygorskite powder are: SiO2: 65.02%, particle size: 1200 mesh;

[0111] The quality indicators of the montmorillonite powder are: SiO2: 71.54%, and particle size: 1100 mesh.

[0112] Preparation of slag-forming materials:

[0113] 1) Weigh the calcium oxide powder, calcium fluoride powder, alumina powder, silicon oxide powder, calcium silicate powder, calcium carbonate powder, barium aluminate powder, palygorskite powder, montmorillonite powder, and water glass according to the mass fractions, place them in a mixer, add 95 parts of water, and stir and mix evenly at a temperature of 45℃, microwave power of 160W, and speed of 200r / min to obtain a mixture.

[0114] 2) The mixture obtained in step 1) is placed in a rotary kiln for calcination, and after cooling, the calcined material is obtained.

[0115] 3) The calcined material obtained in step 2) is crushed and screened to obtain a high-performance slag-forming material with a particle size of 1.2 mm.

[0116] The slag-forming material was tested, and the results are as follows:

[0117] The slag-forming material has a melting point of 1321℃, a viscosity of 0.59 Pa·S, and a bulk density of 1.62 g / cm³. 3 The melting rate is 27 seconds.

[0118] Observations show that the slag-forming material has good spreadability on the surface of molten steel, can directly react with the residue to reduce the melting point and viscosity of the residue, improves slag fluidity, reduces the slag removal process, and removes slag adhering to the ladle wall. It can be seen that the slag-forming material has a low melting point and low bulk density, which is conducive to floating on the surface of molten steel. At the same time, the melting rate is fast, indicating that the slag-forming material has high performance.

[0119] 4. Equipment manufacturing for purification processes:

[0120] To obtain high-quality high-molybdenum and ultra-high-manganese steel castings, in addition to optimizing the chemical composition and strengthening the slag-forming materials during melting, argon blowing is also necessary for purification during the smelting process. The stirring effect caused by argon blowing accelerates the diffusion of dissolved oxygen in the steel into the slag, thereby deoxidizing the molten steel and preventing secondary oxidation.

[0121] This invention designs a simple argon-blowing purification device, used in two stages: the later stage of smelting and the later stage after tapping molten steel, for purification inside the ladle. A schematic diagram of the simplified purification device is shown below. Figure 1 As shown:

[0122] Heat-resistant ceramic tube: 15 mm outer diameter, 7 mm inner diameter, made of high-purity alumina;

[0123] Connection hose: Standard oxygen tubing, 6 mm inner diameter;

[0124] Argon control valve: controls the opening and flow of argon gas;

[0125] For connecting the heat-resistant ceramic tube and the connecting hose, simply insert the connecting hose directly into the inner diameter of the heat-resistant ceramic tube, and then secure the connection with sealing rubber.

[0126] To make the present invention more fully disclosed, more specific embodiments are described below.

[0127] Example 1

[0128] A production process for high-molybdenum and ultra-high-manganese steel includes the following steps:

[0129] (1) Knotting the crucible for alkaline materials (fused magnesia) in medium frequency furnace: After preparing the materials according to the requirements of the medium frequency furnace lining material and furnace collar material, use a mold to knot the crucible, and then dry and sinter it;

[0130] The furnace lining material in step (1) is made by mixing 45 parts of 0-4 mm fused magnesia, 23 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 2 parts of boric acid, and 25 parts of water.

[0131] The furnace collar material is made by mixing 60 parts of 0-3 mm fused magnesia, 10 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 12 parts of water glass, and 5 parts of refractory clay.

[0132] (2) Prepare materials: Weigh the raw materials according to the chemical composition requirements of ultra-high manganese steel and set them aside;

[0133] (3) Charging and slag-forming material smelting: The prepared raw materials are gradually fed into the medium frequency furnace for smelting. During the smelting process, the surface of the ultra-high manganese steel is covered with slag-forming material until the furnace charge is melted and the furnace composition is sampled and analyzed.

[0134] The slag-forming materials in step (3) include the following raw materials in parts by weight: 67 parts of calcium oxide powder, 19 parts of calcium fluoride powder, 38 parts of alumina powder, 23 parts of silica powder, 27 parts of calcium silicate powder, 18 parts of calcium carbonate powder, 5 parts of barium aluminate powder, 14 parts of palygorskite powder, 8 parts of montmorillonite powder, and 5 parts of water glass.

[0135] The quality indicators of the calcium oxide powder are: CaO: 95.3%; S: 0.02%;

[0136] The quality indicators of the calcium fluoride powder are: CaF2: 80.65%, particle size: 1000 mesh;

[0137] The alumina powder has a particle size of 1000 mesh;

[0138] The silica powder has a particle size of 900 mesh;

[0139] The calcium silicate powder has a particle size of 1100 mesh;

[0140] The calcium carbonate powder has a particle size of 1000 mesh;

[0141] The barium aluminate powder has a particle size of 1000 mesh;

[0142] The quality indicators of the palygorskite powder are: SiO2: 65.02%, particle size: 1200 mesh;

[0143] The quality indicators of the montmorillonite powder are: SiO2: 71.54%, particle size: 1100 mesh;

[0144] The preparation method of slag-forming materials includes the following steps:

[0145] 1) Weigh the calcium oxide powder, calcium fluoride powder, alumina powder, silicon oxide powder, calcium silicate powder, calcium carbonate powder, barium aluminate powder, palygorskite powder, montmorillonite powder, and water glass according to the mass fractions, place them in a mixer, add 95 parts of water, and stir and mix evenly at a temperature of 45℃, microwave power of 160W, and speed of 200r / min to obtain a mixture.

[0146] 2) The mixture obtained in step 1) is placed in a rotary kiln for calcination, and after cooling, the calcined material is obtained.

[0147] 3) The calcined material obtained in step 2) is crushed and screened to obtain a high-performance slag-forming material with a particle size of 1.2 mm.

[0148] (4) Adjust the chemical composition: Based on the sampling analysis results, adjust the added material until it is completely melted;

[0149] (5) Furnace purification: After the ultra-high manganese steel in the furnace reaches the required temperature, the power is turned off and the furnace is calcined. At this time, a simple purification device is used (see Figure 1 Argon gas is blown to purify the high-molybdenum and high-manganese molten steel, making the temperature and quality uniform, allowing impurities and gases to float to the surface and fully fuse with the slag-forming material. The argon gas pressure is 0.1 MPa and the purification time is 5 minutes.

[0150] (6) Making new slag: After the furnace purification is completed, the furnace is powered on and heated to the specified temperature of 1590℃ and kept at that temperature. At this time, the slag on the surface of the molten steel is removed and new slag is made according to the requirements of the slag making material.

[0151] (7) Temperature-controlled tapping: After the new slag has completely formed a molten state, measure the temperature of the molten steel and tap the high-manganese molten steel;

[0152] (8) Pregnancy treatment:

[0153] 1) Preheating treatment of inoculant: Weigh the inoculant at 3.1% of the total amount of molten steel and place it at the edge of the furnace mouth for 10 minutes to dry it, ensuring that the inoculant is fully dried;

[0154] The inoculant in step 1) comprises the following raw materials by mass fraction: 21% rare earth magnesium alloy (74% magnesium, 26% rare earth), 32% rare earth ferrosilicon alloy (26% rare earth, 38% Si), 7% ferroniobium (75% niobium) powder, 4% silicon-calcium (55% silicon, 26% calcium) powder, 10% silicon-calcium-barium (52% Si, 10% Ca, 10% Ba) powder, 10% silicon-calcium-barium-aluminum (46% Si, 10% Ca, 10% Ba, 13% Al) powder, 3% ferrovanadium (45% vanadium) powder, 3% ferrotitanium (55% titanium) powder, 4% ferromolybdenum (60% molybdenum) powder, 5% ferrochromium nitride powder, and 1% ferrotungsten (55% tungsten) powder.

[0155] The preparation method of the progesterone includes the following steps:

[0156] a. Ingredients: Weigh all the raw materials in the formula according to the weight ratio, and mix all the powders evenly to obtain the mixture.

[0157] b. Melting and granulation: The mixture is put into a vacuum induction furnace for melting. After reaching the specified temperature, it is discharged from the furnace through an intermediate ladle. When the liquid mixture flows out of the intermediate ladle, an air pressure of 82 m / s is applied to it. The liquid raw material is broken and cooled by strong wind. Under the action of liquid surface tension, inoculant particles with spherical or near-spherical shape are obtained. After sieving, inoculant with standard particle size is obtained.

[0158] 2) Place the preheated inoculant at the bottom of the ladle and compact it;

[0159] 3) Inoculation treatment of molten steel: molten steel is tapped according to the total amount of molten steel tapped from the furnace;

[0160] (9) Second purification treatment inside the ladle: Place the ladle in the designated location and purify it with argon gas at a pressure of 0.3 MPa for 3 minutes;

[0161] (10) Temperature measurement and casting: Measure the temperature of the molten steel, select the casting temperature according to the size of the casting, and then cast the casting. After quenching, the casting is made into high molybdenum and ultra-high manganese steel material.

[0162] Example 2

[0163] A production process for high-molybdenum and ultra-high-manganese steel includes the following steps:

[0164] (1) Knotting the crucible for alkaline materials (fused magnesia) in medium frequency furnace: After preparing the materials according to the requirements of the medium frequency furnace lining material and furnace collar material, use a mold to knot the crucible, and then dry and sinter it;

[0165] The furnace lining material in step (1) is made by mixing 45 parts of 0-4 mm fused magnesia, 23 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 2 parts of boric acid, and 25 parts of water.

[0166] The furnace collar material is made by mixing 60 parts of 0-3 mm fused magnesia, 10 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 12 parts of water glass, and 5 parts of refractory clay.

[0167] (2) Prepare materials: Weigh the raw materials according to the chemical composition requirements of ultra-high manganese steel and set them aside;

[0168] (3) Charging and slag-forming material smelting: The prepared raw materials are gradually fed into the medium frequency furnace for smelting. During the smelting process, the surface of the ultra-high manganese steel is covered with slag-forming material until the furnace charge is melted and the furnace composition is sampled and analyzed.

[0169] The slag-forming materials in step (3) include the following raw materials in parts by weight: 67 parts of calcium oxide powder, 19 parts of calcium fluoride powder, 38 parts of alumina powder, 23 parts of silica powder, 27 parts of calcium silicate powder, 18 parts of calcium carbonate powder, 5 parts of barium aluminate powder, 14 parts of palygorskite powder, 8 parts of montmorillonite powder, and 5 parts of water glass.

[0170] The quality indicators of the calcium oxide powder are: CaO: 95.3%; S: 0.02%;

[0171] The quality indicators of the calcium fluoride powder are: CaF2: 80.65%, particle size: 1000 mesh;

[0172] The alumina powder has a particle size of 1000 mesh;

[0173] The silica powder has a particle size of 900 mesh;

[0174] The calcium silicate powder has a particle size of 1100 mesh;

[0175] The calcium carbonate powder has a particle size of 1000 mesh;

[0176] The barium aluminate powder has a particle size of 1000 mesh;

[0177] The quality indicators of the palygorskite powder are: SiO2: 65.02%, particle size: 1200 mesh;

[0178] The quality indicators of the montmorillonite powder are: SiO2: 71.54%, particle size: 1100 mesh;

[0179] The preparation method of slag-forming materials includes the following steps:

[0180] 1) Weigh the calcium oxide powder, calcium fluoride powder, alumina powder, silicon oxide powder, calcium silicate powder, calcium carbonate powder, barium aluminate powder, palygorskite powder, montmorillonite powder, and water glass according to the mass fractions, place them in a mixer, add 95 parts of water, and stir and mix evenly at a temperature of 45℃, microwave power of 160W, and speed of 200r / min to obtain a mixture.

[0181] 2) The mixture obtained in step 1) is placed in a rotary kiln for calcination, and after cooling, the calcined material is obtained.

[0182] 3) The calcined material obtained in step 2) is crushed and screened to obtain a high-performance slag-forming material with a particle size of 1.2 mm.

[0183] (4) Adjust the chemical composition: Based on the sampling analysis results, adjust the added material until it is completely melted;

[0184] (5) Furnace purification: After the ultra-high manganese steel in the furnace reaches the required temperature, the power is turned off and the furnace is calcined. At this time, a simple purification device is used (see Figure 1 Argon gas is blown to purify the high-molybdenum and high-manganese molten steel, making the temperature and quality uniform, allowing impurities and gases to float to the surface and fully fuse with the slag-forming material. The argon gas pressure is 0.3 MPa and the purification time is 3 minutes.

[0185] (6) Making new slag: After the furnace purification is completed, the furnace is powered on and heated to the specified temperature of 1580℃ and kept at that temperature. At this time, the slag on the surface of the molten steel is removed and new slag is made according to the requirements of the slag making material.

[0186] (7) Temperature-controlled tapping: After the new slag has completely formed a molten state, measure the temperature of the molten steel and tap the high-manganese molten steel;

[0187] (8) Pregnancy treatment:

[0188] 1) Preheating treatment of inoculant: Weigh the inoculant at 3% of the total amount of molten steel and place it at the edge of the furnace mouth for 12 minutes to dry it, ensuring that the inoculant is fully dried;

[0189] The inoculant in step 1), by mass fraction, comprises the following raw materials: 21% rare earth magnesium alloy (74% magnesium, 26% rare earth), 32% rare earth ferrosilicon alloy (26% rare earth, 38% Si), 7% ferroniobium (75% niobium) powder, 4% calcium silicon (55% silicon, 26% calcium) powder, 10% barium silicon (52% Si, 10% Ca, 10% Ba) powder, 10% aluminum silicon (46% Si, 10% Ca, 10% Ba, 13% Al) powder, 3% ferrovanadium (45% vanadium) powder, 3% ferrotitanium (55% titanium) powder, 4% ferromolybdenum (60% molybdenum) powder, 5% ferrochromium nitride powder, and 1% ferrotungsten (55% tungsten) powder. The preparation method of the inoculant includes the following steps:

[0190] a. Ingredients: Weigh all the raw materials in the formula according to the weight ratio, and mix all the powders evenly to obtain the mixture.

[0191] b. Melting and granulation: The mixture is put into a vacuum induction furnace for melting. After reaching the specified temperature, it is discharged from the furnace through an intermediate ladle. When the liquid mixture flows out of the intermediate ladle, an air pressure of 82 m / s is applied to it. The liquid raw material is broken and cooled by strong wind. Under the action of liquid surface tension, inoculant particles with spherical or near-spherical shape are obtained. After sieving, inoculant with standard particle size is obtained.

[0192] 2) Place the preheated inoculant at the bottom of the ladle and compact it;

[0193] 3) Inoculation treatment of molten steel: molten steel is tapped according to the total amount of molten steel tapped from the furnace;

[0194] (9) Second purification treatment inside the ladle: Place the ladle in the designated location and purify it with argon gas at a pressure of 0.1 MPa for 5 minutes;

[0195] (10) Temperature measurement and casting: Measure the temperature of the molten steel, select the casting temperature according to the size of the casting, and then cast the casting. After quenching, the casting is made into high molybdenum and ultra-high manganese steel material.

[0196] Example 3

[0197] A production process for high-molybdenum and ultra-high-manganese steel includes the following steps:

[0198] (1) Knotting the crucible for alkaline materials (fused magnesia) in medium frequency furnace: After preparing the materials according to the requirements of the medium frequency furnace lining material and furnace collar material, use a mold to knot the crucible, and then dry and sinter it;

[0199] The furnace lining material in step (1) is made by mixing 45 parts of 0-4 mm fused magnesia, 23 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 2 parts of boric acid, and 25 parts of water.

[0200] The furnace collar material is made by mixing 60 parts of 0-3 mm fused magnesia, 10 parts of 4-6 mm fused magnesia, 30 parts of fused magnesia powder, 12 parts of water glass, and 5 parts of refractory clay.

[0201] (2) Prepare materials: Weigh the raw materials according to the chemical composition requirements of ultra-high manganese steel and set them aside;

[0202] (3) Charging and slag-forming material smelting: The prepared raw materials are gradually fed into the medium frequency furnace for smelting. During the smelting process, the surface of the ultra-high manganese steel is covered with slag-forming material until the furnace charge is melted and the furnace composition is sampled and analyzed.

[0203] The slag-forming materials in step (3) include the following raw materials in parts by weight: 67 parts of calcium oxide powder, 19 parts of calcium fluoride powder, 38 parts of alumina powder, 23 parts of silica powder, 27 parts of calcium silicate powder, 18 parts of calcium carbonate powder, 5 parts of barium aluminate powder, 14 parts of palygorskite powder, 8 parts of montmorillonite powder, and 5 parts of water glass.

[0204] The quality indicators of the calcium oxide powder are: CaO: 95.3%; S: 0.02%;

[0205] The quality indicators of the calcium fluoride powder are: CaF2: 80.65%, particle size: 1000 mesh;

[0206] The alumina powder has a particle size of 1000 mesh;

[0207] The silica powder has a particle size of 900 mesh;

[0208] The calcium silicate powder has a particle size of 1100 mesh;

[0209] The calcium carbonate powder has a particle size of 1000 mesh;

[0210] The barium aluminate powder has a particle size of 1000 mesh;

[0211] The quality indicators of the palygorskite powder are: SiO2: 65.02%, particle size: 1200 mesh;

[0212] The quality indicators of the montmorillonite powder are: SiO2: 71.54%, particle size: 1100 mesh;

[0213] The preparation method of slag-forming materials includes the following steps:

[0214] 1) Weigh the calcium oxide powder, calcium fluoride powder, alumina powder, silicon oxide powder, calcium silicate powder, calcium carbonate powder, barium aluminate powder, palygorskite powder, montmorillonite powder, and water glass according to the mass fractions, place them in a mixer, add 95 parts of water, and stir and mix evenly at a temperature of 45℃, microwave power of 160W, and speed of 200r / min to obtain a mixture.

[0215] 2) The mixture obtained in step 1) is placed in a rotary kiln for calcination, and after cooling, the calcined material is obtained.

[0216] 3) The calcined material obtained in step 2) is crushed and screened to obtain a high-performance slag-forming material with a particle size of 1.2 mm.

[0217] (4) Adjust the chemical composition: Based on the sampling analysis results, adjust the added material until it is completely melted;

[0218] (5) Furnace purification: After the ultra-high manganese steel in the furnace reaches the required temperature, the power is turned off and the furnace is calcined. At this time, a simple purification device is used (see Figure 1 Argon gas is blown to purify the high-molybdenum and high-manganese molten steel, making the temperature and quality uniform, allowing impurities and gases to float to the surface and fully fuse with the slag-forming material. The argon gas pressure is 0.2 MPa and the purification time is 4 min.

[0219] (6) Making new slag: After the furnace purification is completed, the furnace is powered on and heated to the specified temperature of 1600℃ and kept at that temperature. At this time, the slag on the surface of the molten steel is removed and new slag is made according to the requirements of the slag making material.

[0220] (7) Temperature-controlled tapping: After the new slag has completely formed a molten state, measure the temperature of the molten steel and tap the high-manganese molten steel;

[0221] (8) Pregnancy treatment:

[0222] 1) Preheating treatment of inoculant: Weigh the inoculant at 2.8% of the total amount of molten steel and place it in a 320℃ heating furnace for 2 hours to dry it, ensuring that the inoculant is fully dried;

[0223] The inoculant in step 1), by mass fraction, comprises the following raw materials: 21% rare earth magnesium alloy (74% magnesium, 26% rare earth), 32% rare earth ferrosilicon alloy (26% rare earth, 38% Si), 7% ferroniobium (75% niobium) powder, 4% calcium silicon (55% silicon, 26% calcium) powder, 10% barium silicon (52% Si, 10% Ca, 10% Ba) powder, 10% aluminum silicon (46% Si, 10% Ca, 10% Ba, 13% Al) powder, 3% ferrovanadium (45% vanadium) powder, 3% ferrotitanium (55% titanium) powder, 4% ferromolybdenum (60% molybdenum) powder, 5% ferrochromium nitride powder, and 1% ferrotungsten (55% tungsten) powder. The preparation method of the inoculant includes the following steps:

[0224] a. Ingredients: Weigh all the raw materials in the formula according to the weight ratio, and mix all the powders evenly to obtain the mixture.

[0225] b. Melting and granulation: The mixture is put into a vacuum induction furnace for melting. After reaching the specified temperature, it is discharged from the furnace through an intermediate ladle. When the liquid mixture flows out of the intermediate ladle, an air pressure of 82 m / s is applied to it. The liquid raw material is broken and cooled by strong wind. Under the action of liquid surface tension, inoculant particles with spherical or near-spherical shape are obtained. After sieving, inoculant with standard particle size is obtained.

[0226] 2) Place the preheated inoculant at the bottom of the ladle and compact it;

[0227] 3) Inoculation treatment of molten steel: molten steel is tapped according to the total amount of molten steel tapped from the furnace;

[0228] (9) Second purification treatment inside the ladle: Place the ladle in the designated location and purify it with argon gas at a pressure of 0.2 MPa for 4 minutes;

[0229] (10) Temperature measurement and casting: Measure the temperature of the molten steel, select the casting temperature according to the size of the casting, and then cast the casting. After quenching, the casting is made into high molybdenum and ultra-high manganese steel material.

[0230] Comparative Example 1

[0231] The process for producing high-molybdenum and ultra-high-manganese steel is basically the same as that in Example 3, except that argon purification is not performed in steps (5) and (9).

[0232] The high-molybdenum ultra-high-manganese steel materials obtained in Examples 1-3 were subjected to spectral analysis, and their chemical compositions are shown in the table below:

[0233] Chemical composition (%):

[0234]

[0235]

[0236] The tensile strength σb, yield strength σs, elongation δ, impact toughness αk (U-notch), initial hardness, and oxygen content of the high-molybdenum ultra-high-manganese steel materials produced in Examples 1-3 and Comparative Example 1 were tested. Each indicator was measured three times, and the average value was calculated. The results are as follows:

[0237]

[0238] Note: The tensile strength σb, yield strength σs, elongation δ, impact toughness αk (U-notch), and initial hardness in the table are in accordance with the national standard GBT 5680-2023; oxygen content is detected by spectral analysis, "-" indicates that it is not checked.

[0239] As shown in the table above: (1) The mechanical properties of the high molybdenum ultra-high manganese steel produced by this invention can reach: tensile strength σb≥740.6MPa; yield strength σs≥481.2MPa; elongation δ≥25.6%; impact toughness αk≥120.3J (U-notch), initial hardness≥222.5HB, oxygen content<20ppm. The high molybdenum ultra-high manganese steel produced by this invention has excellent mechanical properties and can meet the production requirements of thick and large cross-section ultra-high manganese steel castings.

[0240] (2) Comparison of the data from Example 3 and Comparative Example 1 shows that the oxygen content of the high-molybdenum and ultra-high-manganese steel material obtained by purifying molten steel with argon gas is significantly reduced, and the mechanical properties of the obtained high-molybdenum and ultra-high-manganese steel material are also significantly improved.

[0241] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A production process for high-molybdenum and ultra-high-manganese steel materials, characterized in that, Includes the following steps: (1) Knotting the crucible of basic material for medium frequency furnace: After preparing the materials according to the requirements of the medium frequency furnace lining material and furnace collar material, use a mold to knot the crucible, and then dry and sinter it; (2) Prepare materials: Weigh the raw materials according to the chemical composition requirements of ultra-high manganese steel and set them aside; (3) Charging and slag-forming material smelting: The prepared raw materials are gradually fed into the medium frequency furnace for smelting. During the smelting process, the surface of the ultra-high manganese steel is covered with slag-forming material until the furnace charge is melted and the furnace composition is sampled and analyzed. (4) Adjust the chemical composition: Based on the sampling analysis results, adjust the added materials until they are completely melted; (5) Furnace purification: After the ultra-high manganese steel in the furnace reaches the required temperature, the power is turned off and the furnace is sedated. At this time, a purification device is used to blow argon gas to purify the high molybdenum and high manganese steel so that the temperature and quality of the high molybdenum and high manganese steel are uniform, and impurities and gases are fully floated to the surface and fully fused with the slag-forming material. (6) Making new slag: After the furnace purification is completed, the furnace is powered on and heated to the specified temperature and kept at that temperature. At this time, the slag on the surface of the molten steel is removed and new slag is made according to the requirements of the slag making material. (7) Temperature control for tapping: After the new slag has completely formed a molten state, measure the temperature of the molten steel and tap the high-manganese molten steel; (8) Incubation treatment; (9) Second purification treatment inside the ladle: Place the ladle in a designated location and purify it with argon gas; (10) Temperature measurement and casting: Measure the temperature of the molten steel, select the casting temperature according to the size of the casting, and then cast the casting. After quenching, the casting is made into high molybdenum and ultra-high manganese steel material. The method of incubation treatment in step (8) includes the following steps: 1) Preheating treatment of inoculant: Weigh the inoculant and dry it to ensure that it is fully dried. The drying method is to place the inoculant near the furnace opening for preheating for more than 10 minutes or place it in a heating furnace at 280-350℃ for 1-3 hours. 2) Place the preheated inoculant at the bottom of the ladle and compact it; 3) Inoculation treatment of molten steel: molten steel is tapped according to the total amount of molten steel tapped from the furnace; The inoculant, by weight percentage, comprises the following raw materials: 21% rare earth magnesium alloy, 32% rare earth ferrosilicon alloy, 7% niobium iron powder, 4% silicon calcium powder, 10% silicon calcium barium powder, 10% silicon calcium barium aluminum powder, 3% vanadium iron powder, 3% titanium iron powder, 4% molybdenum iron powder, 5% chromium nitride iron powder, and 1% tungsten iron powder; The preparation method of the progesterone includes the following steps: 1) Ingredients: Weigh all the raw materials in the formula according to the weight ratio, and mix all the powders evenly to obtain the mixture. 2) Melting and granulation: The mixture is put into a vacuum induction furnace for melting. After reaching the specified temperature, it is taken out of the furnace through an intermediate ladle. When the liquid mixture flows out of the intermediate ladle, air pressure is applied to it. The liquid raw material is broken and cooled by strong wind. Under the action of liquid surface tension, inoculant particles with spherical or near-spherical shape are obtained. After sieving, the inoculant is obtained. The inoculant accounts for 2.7-3.2% of the total amount of molten steel produced.

2. The production process of high-molybdenum ultra-high-manganese steel material according to claim 1, characterized in that, The furnace lining material mentioned in step (1) is made by mixing 0-4 mm fused magnesia, 4-6 mm fused magnesia, fused magnesia powder, boric acid, and water.

3. The production process of high-molybdenum ultra-high-manganese steel material according to claim 1, characterized in that, The furnace collar material mentioned in step (1) is made by mixing 0-3 mm fused magnesia, 4-6 mm fused magnesia, fused magnesia powder, water glass and refractory clay.

4. The production process of high-molybdenum ultra-high-manganese steel material according to claim 1, characterized in that, In step (5), the argon gas pressure is 0.1-0.3 MPa and the purification time is 3-5 min.

5. The production process of high-molybdenum ultra-high-manganese steel material according to claim 1, characterized in that, The temperature specified in step (6) is 1580-1600℃.

6. The production process of high-molybdenum ultra-high-manganese steel material according to claim 1, characterized in that, In step (9), argon gas is introduced for purification. The argon gas pressure is 0.1-0.3 MPa and the purification time is 3-5 min.

7. A high-molybdenum ultra-high-manganese steel material produced by the production process according to any one of claims 1-6, characterized in that, The high-molybdenum and ultra-high-manganese steel material, by mass percentage, comprises the following components: 1.30-1.50% carbon, 0.40-1.00% silicon, 25.00-28.00% manganese, 1.50-2.500% molybdenum, no more than 0.06% phosphorus, no more than 0.03% sulfur, and the total amount of nickel, vanadium, titanium, and copper is less than 1.0%, with the balance being Fe.

Images