CN114107844A - High-purity manganese 25 high-manganese steel - Google Patents
High-purity manganese 25 high-manganese steel Download PDFInfo
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Abstract
The invention discloses high-purity manganese 25 high-manganese steel which comprises the following components in percentage by mass: 1.04-1.19% of C, 0.65-0.96% of Si, 23.62-25.86% of Mn, 2.01-2.85% of Cr, 0.24-0.74% of Cu, 0.11-0.26% of Al, 0.06-0.18% of Mo, 0.03-0.1% of Ni, 0.08-0.19% of W, O element with the content less than or equal to 0.00078%, the content of H element with the content less than or equal to 0.00021%, the content of other trace elements with the content less than or equal to 0.82%, and the balance of Fe. The manganese 25 high manganese steel prepared by the process has the oxygen content of 7.8ppm, the hydrogen content of 2.1ppm and the yield strength of 486.2MPa, and the yield strength can meet the application requirements of mechanical equipment members in the industries of metallurgy, mines, building materials and the like.
Description
Technical Field
The invention belongs to the technical field of refining and purification, and particularly relates to high-purity manganese 25 high-manganese steel.
Background
High manganese steels are conventional wear resistant materials. Over a hundred years of development, three series of manganese 13, manganese 18 and manganese 25 have formed. The high manganese steel is widely used in mechanical equipment components in the industries of metallurgy, mines, building materials, cement, railways, electric power, petrochemical industry, military industry and the like. The purity degree of the high manganese molten steel directly influences the quality of castings, and the content of gases such as oxides, inclusions, hydrogen, oxygen and the like in the high manganese molten steel directly influences the performance of materials. Reducing harmful gases such as oxygen, hydrogen and the like, and greatly improving the material performance, but the effect of removing impurities (harmful gases such as oxygen, hydrogen and the like) in the prior art is poor.
Disclosure of Invention
The invention provides high-purity manganese 25 high-manganese steel, which aims to solve the problem of poor impurity removal effect (harmful gases such as oxygen and hydrogen) in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-purity manganese 25 high-manganese steel comprises the following components in percentage by mass: 1.04-1.19% of C, 0.65-0.96% of Si, 23.62-25.86% of Mn, 2.01-2.85% of Cr, 0.24-0.74% of Cu, 0.11-0.26% of Al, 0.06-0.18% of Mo, 0.03-0.1% of Ni, 0.08-0.19% of W, O element with the content less than or equal to 0.00078%, the content of H element with the content less than or equal to 0.00021%, the content of other trace elements with the content less than or equal to 0.82%, and the balance of Fe.
Further, the high-purity manganese 25 high-manganese steel comprises the following components in percentage by mass: the composite material comprises the following components in percentage by mass: 1.07% of C, 0.81% of Si, 24.56% of Mn, 2.53% of Cr, 0.62% of Cu, 0.21% of Al, 0.12% of Mo, 0.06% of Ni, 0.12% of W, O element content of 0.00078% of H element content of 0.00021% of other trace elements content of 0.82% of Fe, and the balance of Fe.
Further, the preparation method of the high-purity manganese 25 high-manganese steel comprises the following steps:
(1) and (3) knotting the crucible: installing air bricks at the bottom of a medium frequency furnace according to requirements, wherein the medium frequency furnace comprises a furnace cover, a furnace lining, a furnace wall layer, a gas diffuser, air bricks and a connector, the furnace cover is arranged at the top of the medium frequency furnace, the furnace wall layer is arranged on the outer surface of the furnace lining, the gas diffuser, the air bricks and the connector are arranged at the bottom of the medium frequency furnace, the air bricks wrap the gas diffuser, the connector is arranged below the gas diffuser, and then a crucible is knotted by using a furnace lining material and a mold, dried and sintered;
(2) designing and manufacturing a gas diffuser according to the volume of the intermediate frequency furnace;
(3) the method comprises the following steps of installing a gas diffuser in the center of the bottom of the intermediate frequency furnace, and connecting the gas diffuser with an argon blowing system, wherein the argon blowing system comprises a gas inlet pipe, an argon bottle, a pressure reducing valve and a flow regulator, the gas inlet pipe is connected with the gas diffuser, a joint is connected with the gas inlet pipe and fixed at the bottom of the intermediate frequency furnace, the gas inlet pipe is connected with the flow regulator, the flow regulator is connected with the pressure reducing valve, and the pressure reducing valve is connected with the argon bottle;
(4) preparing materials: weighing various materials for smelting the high-manganese molten steel according to the chemical component requirements of the high-manganese molten steel for later use;
(5) charging and smelting: the prepared raw materials are gradually put into an intermediate frequency furnace for smelting, when furnace charges are melted to form a molten pool, namely high manganese molten steel covers over 28.9cm of the furnace bottom, a flow regulator is started to blow and inject argon, the argon participates in the high manganese molten steel smelting process through air bricks, and the process is as follows: controlling argon flow to be 0.94-1.08Nm in the first 7-12min3H; controlling argon flow to be 1.15-1.31Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.27-1.53Nm in 19-28min3H; covering the surface of the high manganese molten steel with a furnace slag agent at the beginning of 29 min; controlling the flow rate of argon gas to be 1.32-1.44Nm in 29-50min3H; until furnace burden is melted down, sampling and analyzing components in the furnace;
(6) adjusting chemical components: calculating and adding the adjusting material according to the sampling analysis result until the adjusting material is completely melted;
(7) and (3) sedation in a furnace: after the high manganese molten steel in the intermediate frequency furnace reaches the required temperature, stopping power supply, continuously blowing argon to ensure that the high manganese molten steel is uniform in temperature and homogeneous, and impurities and gases are fully floated and combined with the slag agent of the liquid level furnace;
(8) controlling temperature and tapping: controlling the temperature, tapping and pouring to obtain the high-purity manganese 25 high-manganese steel.
Further, the furnace wall layer in the step (1) is a high-temperature-resistant synthetic material layer.
Further, the high-temperature resistant synthetic material layer is made of silicon carbide, alumina emery and a silicon iron material.
Further, the thickness of the high-temperature resistant synthetic material layer is 0.8-1.3 cm.
Further, in the step (3), the air inlet pipe is a pressure-resistant rubber pipe.
Further, the inner diameter of the pressure-resistant rubber tube is 0.4-0.6 cm.
Further, the addition amount of the furnace slag agent in the step (5) is 0.62-0.65 kg/ton steel.
The invention has the following beneficial effects:
the manganese 25 high manganese steel prepared by the process has the oxygen content of 7.8ppm, the hydrogen content of 2.1ppm and the yield strength of 486.2MPa, and the yield strength can meet the application requirements of mechanical equipment members in the industries of metallurgy, mines, building materials and the like.
Drawings
FIG. 1 is a schematic view of the structure of an intermediate frequency furnace and an argon blowing system according to the present invention.
Detailed Description
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
As shown in fig. 1, an intermediate frequency furnace includes a furnace cover 1, a furnace lining 2, a furnace wall layer (crucible) 3, a gas diffuser 6, gas permeable bricks 7 and a connector 8, wherein the furnace cover 1 is arranged at the top of the intermediate frequency furnace, the furnace wall layer 3 is arranged on the outer surface of the furnace lining 2, the gas diffuser 6, the gas permeable bricks 7 and the connector 8 are arranged at the bottom of the intermediate frequency furnace, the gas diffuser 6 is wrapped by the gas permeable bricks 7, and the connector 8 is arranged below the gas diffuser 6.
The argon blowing system comprises an air inlet pipe 9, an argon gas bottle 10, a pressure reducing valve 11 and a flow regulator 12, the air inlet pipe 9 is connected with a gas diffuser 6, a joint 8 is connected with the air inlet pipe 9 and fixed at the bottom of the intermediate frequency furnace, the air inlet pipe 9 is connected with the flow regulator 12, the pressure reducing valve 11 is connected with the flow regulator 12, and the pressure reducing valve 11 is connected with the argon gas bottle 10.
The crucible of the intermediate frequency furnace is filled with slag 4 and molten steel 5.
The furnace wall layer 3 is a high-temperature-resistant synthetic material layer.
The high-temperature resistant synthetic material layer is made of silicon carbide, alumina emery and a silicon iron material.
The thickness of the high-temperature resistant synthetic material layer is 0.8-1.3 cm.
The air inlet pipe 9 is a pressure-resistant rubber pipe.
The inner diameter of the pressure-resistant rubber tube is 0.4-0.6 cm.
The intermediate frequency furnace designed by the invention has the following beneficial effects:
(1) compared with the prior art, the gas permeable brick is arranged at the bottom of the intermediate frequency furnace, and the argon is injected, so that the impurities such as slag, oxides, hydrogen and the like in the high manganese molten steel can float upwards quickly, the purification is full, and the oxidation and loss of the components of the high manganese molten steel can be effectively avoided. (2) The air brick and the furnace lining are used integrally, argon is blown under the atmospheric condition, the investment of external refining equipment can be reduced, and the operation process of refining the high manganese steel by the intermediate frequency furnace is simplified.
The furnace slag agent comprises the following raw materials in parts by weight: 20-40 parts of lime powder, 12-23 parts of active white soil powder, 7-10 parts of montmorillonite powder, 15-26 parts of calcium aluminate powder, 8-13 parts of barium carbonate powder, 4-6 parts of yttrium oxide powder, 8-11 parts of fluorite powder, 9-12 parts of wollastonite powder and 13-16 parts of medical stone powder;
the granularity of the lime powder is 600-800 meshes;
the granularity of the active kaolin powder is 800-1000 meshes;
the granularity of the montmorillonite powder is 800-1000 meshes;
the particle size of the calcium aluminate powder is 700-900 meshes;
the granularity of the barium carbonate powder is 700-1000 meshes;
the granularity of the yttrium oxide powder is 900-1100 meshes;
the particle size of the fluorite powder is 800-1000 meshes;
the granularity of the wollastonite powder is 800-1000 meshes;
the granularity of the medical stone powder is 700-1000 meshes;
the preparation method of the furnace slag agent comprises the following steps:
s1: adding lime powder, active white earth powder, montmorillonite powder, calcium aluminate powder, barium carbonate powder, yttrium oxide powder, fluorite powder, wollastonite powder and medical stone powder into a stirrer according to the parts by weight, simultaneously adding 160 parts of 100-fold water, and stirring for 1-1.5h at the rotating speed of 300-fold water at 500r/min to prepare uniform slurry;
s2: adding the uniform slurry prepared in the step S1 into a mould, and preparing into particles with the particle size of 0.8-1.5cm after vacuum suction filtration molding;
s3: and (4) feeding the granules prepared in the step (S2) into an oven, and drying at 82-93 ℃ until the water content is less than or equal to 1.2% to prepare the furnace slag agent.
The technical principle and the effect of the furnace slag agent of the invention are as follows:
the CaO component of the lime powder can adjust the alkalinity of the furnace slag agent, is an important component for realizing the desulfurization of the high manganese molten steel and reducing the reoxidation pollution of the high manganese molten steel, and the alkalinity of the furnace slag agent can not be well controlled by the excessively high or excessively low CaO content. The active clay has the main chemical components of aluminum oxide, silicon dioxide, water, a small amount of iron, magnesium, calcium and the like, has high adsorbability and is beneficial to adsorbing impurities such as oxygen, hydrogen and the like in high-manganese molten steel, and in addition, the active clay begins to lose crystal water after being heated to more than 300 ℃ to change the structure, so the active clay has a low melting point. Montmorillonite is a 2:1 type silicate mineral containing crystal water, which is a good thermal expansion material and can increase volume after heating, and two layers of silicon-oxygen tetrahedral sheets connected together at the top sandwich a layer of aluminum (magnesium) oxygen (oxyhydrogen) octahedral sheets connected together at the edges,has strong adsorption capacity and cation exchange performance, and is favorable for adsorbing impurities such as oxygen, hydrogen and the like in the high manganese molten steel. The introduction of calcium aluminate is beneficial to removing impurities such as oxygen in the high manganese molten steel, reducing the content of harmful elements and impurities in the high manganese molten steel and achieving the slag absorption effect. CaO generated by thermal decomposition of barium carbonate powder belongs to alkaline oxides, can improve the alkalinity of the furnace slag agent, enhance the desulfurization and dephosphorization capability of the furnace slag agent, and generate CO2The content of H in the high manganese molten steel is reduced. The yttrium oxide can play a role in purifying impurities in high manganese molten steel, and particularly reducing the content of diffused hydrogen. The fluorite can reduce the viscosity, melting point and surface tension of the furnace slag agent, increase the fluidity of the furnace slag agent, and improve the hydrogen absorption amount of the furnace slag agent to high manganese molten steel by a proper amount of fluorite. Wollastonite containing SiO2And SiO2With CaF in fluorite2The reaction achieves the effect of dehydrogenation. The medical stone has stronger surface adsorption capacity, good rheological property and catalytic property, and ideal colloidal property and heat resistance, is a better adsorption material, and is beneficial to adsorbing impurities such as oxygen, hydrogen and the like in high manganese molten steel. The furnace slag agent disclosed by the invention reduces the contents of O and H in high-manganese molten steel under the synergistic effect of the mutual matching and the synergistic effect of the lime powder, the active white soil powder, the montmorillonite powder, the calcium aluminate powder, the barium carbonate powder, the yttrium oxide powder, the fluorite powder, the wollastonite powder and the medical stone powder, greatly improves the quality of the high-manganese molten steel and is beneficial to preparing high-purity high-manganese steel. Because the furnace slag agent prepared by the invention has the characteristics of low melting point and high activity, the addition amount of molten steel per ton is only 0.62-0.65kg, and the furnace slag agent has the advantages of less furnace slag addition amount and the like compared with the prior art, and the cost can be reduced.
The following is a more specific example.
Example 1
As shown in fig. 1, an intermediate frequency furnace includes a furnace cover 1, a furnace lining 2, a furnace wall layer (crucible) 3, a gas diffuser 6, gas permeable bricks 7 and a connector 8, wherein the furnace cover 1 is arranged at the top of the intermediate frequency furnace, the furnace wall layer 3 is arranged on the outer surface of the furnace lining 2, the gas diffuser 6, the gas permeable bricks 7 and the connector 8 are arranged at the bottom of the intermediate frequency furnace, the gas diffuser 6 is wrapped by the gas permeable bricks 7, and the connector 8 is arranged below the gas diffuser 6.
The argon blowing system comprises an air inlet pipe 9, an argon gas bottle 10, a pressure reducing valve 11 and a flow regulator 12, the air inlet pipe 9 is connected with a gas diffuser 6, a joint 8 is connected with the air inlet pipe 9 and fixed at the bottom of the intermediate frequency furnace, the air inlet pipe 9 is connected with the flow regulator 12, the pressure reducing valve 11 is connected with the flow regulator 12, and the pressure reducing valve 11 is connected with the argon gas bottle 10.
The crucible of the intermediate frequency furnace is filled with slag 4 and molten steel 5.
The furnace wall layer 3 is a high-temperature-resistant synthetic material layer.
The high-temperature resistant synthetic material layer is made of silicon carbide, alumina emery and a silicon iron material.
The thickness of the high-temperature resistant synthetic material layer is 1 cm.
The air inlet pipe 9 is a pressure-resistant rubber pipe.
The inner diameter of the pressure-resistant rubber tube is 0.5 cm.
The use method of the intermediate frequency furnace and the argon blowing system comprises the following steps:
(1) and (3) knotting the crucible: installing the air brick at the bottom of the intermediate frequency furnace according to requirements, knotting the crucible by using a furnace lining material and a mold, and drying and sintering;
(2) designing and manufacturing a gas diffuser according to the volume of the intermediate frequency furnace;
(3) installing a gas diffuser in the center of the bottom of the intermediate frequency furnace and connecting the gas diffuser with an argon blowing system;
(4) preparing materials: weighing various materials for smelting the high-manganese molten steel according to the chemical component requirements of the high-manganese molten steel for later use;
(5) charging and smelting: the prepared raw materials are gradually put into an intermediate frequency furnace for smelting, when furnace charges are melted to form a molten pool, namely high manganese molten steel covers the furnace bottom by 28.9cm, a flow regulator is started to blow and inject argon, the argon participates in the high manganese molten steel smelting process through air bricks, and the process is as follows: controlling argon flow to be 0.94-1.08Nm in the first 7-12min3H; controlling argon flow to be 1.15-1.31Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.27-1.53Nm in 19-28min3H; covering the furnace on the surface of the high manganese molten steel at the beginning of 29minSlag melting agent with the addition amount of 0.64kg per ton steel; controlling the flow rate of argon gas to be 1.32-1.44Nm in 29-50min3H; until furnace burden is melted down, sampling and analyzing components in the furnace;
(6) adjusting chemical components: calculating and adding the adjusting material according to the sampling analysis result until the adjusting material is completely melted;
(7) and (3) sedation in a furnace: after the high manganese molten steel in the intermediate frequency furnace reaches the required temperature, stopping power supply, continuously blowing argon to ensure that the high manganese molten steel is uniform in temperature and homogeneous, and impurities and gases are fully floated and combined with the slag agent of the liquid level furnace;
(8) controlling temperature and tapping: controlling the temperature, tapping and pouring to prepare the high-purity manganese 25 high-manganese steel, and adopting spectral analysis, wherein the high-purity manganese 25 high-manganese steel comprises the following components in percentage by mass: 1.07% of C, 0.81% of Si, 24.56% of Mn, 2.53% of Cr, 0.62% of Cu, 0.21% of Al, 0.12% of Mo, 0.06% of Ni, 0.12% of W, O element content of 7.8ppm, H element content of 2.1ppm, other trace elements content of 0.82%, and the balance of Fe.
The furnace slag agent in the step (5) comprises the following raw materials in parts by weight: 38 parts of lime powder, 20 parts of active white soil powder, 9 parts of montmorillonite powder, 25 parts of calcium aluminate powder, 12 parts of barium carbonate powder, 6 parts of yttrium oxide powder, 10 parts of fluorite powder, 12 parts of wollastonite powder and 15 parts of medical stone powder;
the granularity of the lime powder is 800 meshes;
the granularity of the active kaolin powder is 1000 meshes;
the granularity of the montmorillonite powder is 900 meshes;
the particle size of the calcium aluminate powder is 900 meshes;
the granularity of the barium carbonate powder is 1000 meshes;
the granularity of the yttrium oxide powder is 1000 meshes;
the particle size of the fluorite powder is 1000 meshes;
the particle size of the wollastonite powder is 1000 meshes;
the granularity of the medical stone powder is 900 meshes;
the preparation method of the furnace slag agent comprises the following steps:
s1: adding lime powder, active white earth powder, montmorillonite powder, calcium aluminate powder, barium carbonate powder, yttrium oxide powder, fluorite powder, wollastonite powder and medical stone powder into a stirrer according to parts by weight, adding 150 parts of water at the same time, and stirring at the rotating speed of 500r/min for 1h to prepare uniform slurry;
s2: adding the uniform slurry prepared in the step S1 into a mould, and preparing particles with the particle size of 1.4cm after vacuum suction filtration molding;
s3: and (4) feeding the granules prepared in the step S2 into an oven, and drying at 90 ℃ until the water content is 1.1% to prepare the furnace slag agent.
Comparative example 1
The method for preparing manganese 25 high manganese steel was substantially the same as that of example 1, except that no slag melting agent was added to remove impurities during the charging and melting in step (5).
Comparative example 2
The method for preparing manganese 25 high manganese steel is basically the same as that of example 1, except that the raw materials for preparing the furnace slag agent lack active white earth powder, calcium aluminate powder, fluorite powder, wollastonite powder and medical stone powder.
Comparative example 3
The process for making manganese 25 high manganese steel of example 1 was essentially the same except that the raw materials for making the furnace slag agent were devoid of activated clay fines.
Comparative example 4
The method for producing manganese 25 high manganese steel of example 1 was substantially the same except that calcium aluminate powder was absent from the raw material for the preparation of the furnace slag agent.
Comparative example 5
The process for producing manganese 25 high manganese steel of example 1 was substantially the same except that the raw material for producing the furnace slag agent was deficient in fluorite powder.
Comparative example 6
The process for producing manganese 25 high manganese steel of example 1 was essentially the same except that the raw material for the furnace slag agent was absent of wollastonite powder.
Comparative example 7
The method of producing manganese 25 high manganese steel of example 1 was substantially the same except that the raw material for producing the furnace slag agent was deficient in the medical stone powder.
Comparative example 8
The process for producing manganese 25 high manganese steel was substantially the same as that of example 1, except that the purging with argon was not performed in the charging and melting in the step (5).
The yield strength and the oxygen and hydrogen contents of the manganese 25 high manganese steel prepared in the example 1 and the comparative examples 1 to 8 are detected, wherein the yield strength is detected by using relevant regulations of GB/T5680-2010; the oxygen and hydrogen contents are detected by adopting spectral analysis, and the detection results are shown in the following table:
note: "-" indicates no inspection.
From the above table, it can be seen that: (1) the data of example 1 show that the manganese 25 high manganese steel prepared by the process of the invention has the oxygen content of 7.8ppm, the hydrogen content of 2.1ppm and the yield strength of 486.2MPa, and the yield strength can meet the application requirements of mechanical equipment members in the industries of metallurgy, mines, building materials and the like.
(2) As can be seen from the data of the embodiment 1 and the comparative example 1, the slag melting agent is adopted to remove impurities in the charging smelting process, so that the hydrogen and oxygen contents can be effectively reduced, the yield strength of the manganese 25 high manganese steel is improved, and the yield strength is improved by 64.8%.
(3) From the yield strength data of example 1 and comparative example 2, the effect value of yield strength produced when the active white earth powder, calcium aluminate powder, fluorite powder, wollastonite powder, and medical stone powder are used together is 486.2-338.2-148 (MPa); from the yield strength data of example 1 and comparative example 3, the effect values of yield strength produced by the activated clay powder alone, 486.2-456.3-29.9 (MPa), can be calculated; from the yield strength data of example 1 and comparative example 4, the effect value of yield strength produced by calcium aluminate powder alone, 486.2-467.4-18.8 (MPa), can be calculated; made of fruitThe yield strength data of example 1 and comparative example 5 can be calculated to yield strength values 486.2-453.2-33 (MPa) for fluorite powder alone; from the yield strength data of example 1 and comparative example 6, the effect value of yield strength produced by wollastonite powder alone, 486.2-462.1-24.1 (MPa), can be calculated; from the yield strength data of example 1 and comparative example 7, the effect value of yield strength produced when the medical stone powder was used alone, 486.2-459.7-26.5 (MPa), was calculated; by combining the data, the yield strength effect value generated by the superposition of the active white soil powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder when the active white soil powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder are respectively and independently used is calculated to be 29.9+18.8+33+24.1+ 26.5-132.3 (MPa), and in conclusion, the yield strength effect value generated by the combination of the active white soil powder, the calcium aluminate powder, the fluorite powder and the medical stone powder when the active white soil powder, the calcium aluminate powder, the fluorite powder and the medical stone powder are used together is calculated to be improved by the percentage (148-132.3) ÷ 132.3 × 100%: 11.9% > 10%, and the value is more than 10%, which indicates that the active white soil powder, the aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder play a synergistic effect in the preparation of the manganese 25 high manganese steel, and the yield strength is synergistically improved. This is because: the active clay mainly comprises aluminum oxide, silicon dioxide, water and a small amount of iron, magnesium, calcium and the like, has high adsorbability and is beneficial to adsorbing impurities such as oxygen, hydrogen and the like in the high manganese molten steel. The introduction of calcium aluminate is beneficial to removing impurities such as oxygen in the high manganese molten steel, reducing the content of harmful elements and impurities in the high manganese molten steel and achieving the slag absorption effect. The fluorite can reduce the viscosity, melting point and surface tension of the furnace slag agent, increase the fluidity of the furnace slag agent, and improve the hydrogen absorption capacity of the furnace slag agent to the manganese 25 high manganese steel. Wollastonite containing SiO2And SiO2With CaF in fluorite2The reaction achieves the effect of dehydrogenation. The medical stone has stronger surface adsorption capacity, good rheological property and catalytic property, and ideal colloidal property and heat resistance, is a better adsorption material, and is beneficial to adsorbing impurities such as oxygen, hydrogen and the like in molten steel. Therefore, it is originally sent outThe active white earth powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder are mutually matched, so that the hydrogen and oxygen contents are effectively reduced, and the yield strength of the manganese 25 high manganese steel is synergistically improved.
(4) As can be seen from the data of the embodiment 1 and the comparative example 8, the argon blowing impurity removal is carried out in the charging smelting process, so that the hydrogen and oxygen contents can be effectively reduced, the yield strength of the manganese 25 high manganese steel is improved, and the yield strength is improved by 14.9%.
While there has been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions may be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the invention.
Claims (9)
1. The high-purity manganese 25 high-manganese steel is characterized by comprising the following components in percentage by mass: 1.04-1.19% of C, 0.65-0.96% of Si, 23.62-25.86% of Mn, 2.01-2.85% of Cr, 0.24-0.74% of Cu, 0.11-0.26% of Al, 0.06-0.18% of Mo, 0.03-0.1% of Ni, 0.08-0.19% of W, O element with the content less than or equal to 0.00078%, the content of H element with the content less than or equal to 0.00021%, the content of other trace elements with the content less than or equal to 0.82%, and the balance of Fe.
2. The high purity pure manganese 25 high manganese steel of claim 1, comprising the following composition in weight percent: the composite material comprises the following components in percentage by mass: 1.07% of C, 0.81% of Si, 24.56% of Mn, 2.53% of Cr, 0.62% of Cu, 0.21% of Al, 0.12% of Mo, 0.06% of Ni, 0.12% of W, O element content of 0.00078% of H element content of 0.00021% of other trace elements content of 0.82% of Fe, and the balance of Fe.
3. The high purity pure manganese 25 high manganese steel of claim 1 or 2, characterized in that its preparation method comprises the following steps:
(1) and (3) knotting the crucible: installing air bricks at the bottom of a medium frequency furnace according to requirements, wherein the medium frequency furnace comprises a furnace cover, a furnace lining, a furnace wall layer, a gas diffuser, air bricks and a connector, the furnace cover is arranged at the top of the medium frequency furnace, the furnace wall layer is arranged on the outer surface of the furnace lining, the gas diffuser, the air bricks and the connector are arranged at the bottom of the medium frequency furnace, the air bricks wrap the gas diffuser, the connector is arranged below the gas diffuser, and then a crucible is knotted by using a furnace lining material and a mold, dried and sintered;
(2) designing and manufacturing a gas diffuser according to the volume of the intermediate frequency furnace;
(3) the method comprises the following steps of installing a gas diffuser in the center of the bottom of the intermediate frequency furnace, and connecting the gas diffuser with an argon blowing system, wherein the argon blowing system comprises a gas inlet pipe, an argon bottle, a pressure reducing valve and a flow regulator, the gas inlet pipe is connected with the gas diffuser, a joint is connected with the gas inlet pipe and fixed at the bottom of the intermediate frequency furnace, the gas inlet pipe is connected with the flow regulator, the flow regulator is connected with the pressure reducing valve, and the pressure reducing valve is connected with the argon bottle;
(4) preparing materials: weighing various materials for smelting the high-manganese molten steel according to the chemical component requirements of the high-manganese molten steel for later use;
(5) charging and smelting: the prepared raw materials are gradually put into an intermediate frequency furnace for smelting, when furnace charges are melted to form a molten pool, namely high manganese molten steel covers over 28.9cm of the furnace bottom, a flow regulator is started to blow and inject argon, the argon participates in the high manganese molten steel smelting process through air bricks, and the process is as follows: controlling argon flow to be 0.94-1.08Nm in the first 7-12min3H; controlling argon flow to be 1.15-1.31Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.27-1.53Nm in 19-28min3H; covering the surface of the high manganese molten steel with a furnace slag agent at the beginning of 29 min; controlling the flow rate of argon gas to be 1.32-1.44Nm in 29-50min3H; until furnace burden is melted down, sampling and analyzing components in the furnace;
(6) adjusting chemical components: calculating and adding the adjusting material according to the sampling analysis result until the adjusting material is completely melted;
(7) and (3) sedation in a furnace: after the high manganese molten steel in the intermediate frequency furnace reaches the required temperature, stopping power supply, continuously blowing argon to ensure that the high manganese molten steel is uniform in temperature and homogeneous, and impurities and gases are fully floated and combined with the slag agent of the liquid level furnace;
(8) controlling temperature and tapping: controlling the temperature, tapping and pouring to obtain the high-purity manganese 25 high-manganese steel.
4. The high purity manganese 25 high manganese steel of claim 3, wherein in step (1) said furnace wall layer is a high temperature resistant synthetic material layer.
5. The high purity manganese 25 high manganese steel of claim 4, wherein said layer of high temperature resistant synthetic material is made of silicon carbide, alumina corundum and ferrosilicon.
6. The high purity manganese 25 high manganese steel of claim 5, wherein the thickness of the high temperature resistant synthetic material layer is 0.8-1.3 cm.
7. The high purity manganese 25 high manganese steel of claim 3, wherein in step (3) the gas inlet pipe is a pressure resistant rubber pipe.
8. The high purity manganese 25 high manganese steel of claim 7, wherein the inner diameter of the pressure resistant rubber tube is 0.4-0.6 cm.
9. The high purity manganese 25 high manganese steel according to claim 3, wherein said slag agent is added in step (5) in an amount of 0.62-0.65 kg/ton steel.
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