CN114134287A - Furnace slag agent and application method thereof in refining high-purity ultrahigh manganese steel - Google Patents

Furnace slag agent and application method thereof in refining high-purity ultrahigh manganese steel Download PDF

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CN114134287A
CN114134287A CN202111186207.9A CN202111186207A CN114134287A CN 114134287 A CN114134287 A CN 114134287A CN 202111186207 A CN202111186207 A CN 202111186207A CN 114134287 A CN114134287 A CN 114134287A
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powder
furnace
parts
furnace slag
percent
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周正
赵四勇
田辉
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Guangxi Fuchuan Zhenghui Machinery Co ltd
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Guangxi Fuchuan Zhenghui Machinery Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention discloses a furnace slag agent, which 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 active white earth powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder in the raw materials of the furnace slag agent play a synergistic role in preparing the ultrahigh manganese steel, and the yield strength is synergistically improved.

Description

Furnace slag agent and application method thereof in refining high-purity ultrahigh manganese steel
Technical Field
The invention belongs to the technical field of refining and purification, and particularly relates to a furnace slag agent and an application method thereof in refining high-purity ultrahigh manganese steel.
Background
High manganese steels are conventional wear resistant materials. Over a hundred years of development, a number of lines have been developed, one of which is ultra high manganese steel. 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 wear resistance and the service life of the high manganese steel casting have very important relationship with the metallurgical quality. The wear resistance of the high manganese steel casting is improved, the service life is prolonged, and the method has great significance for continuous production, reduction of economic loss, increase of economic benefit, creation of wear-resistant casting competitive products and brands and participation in international market competition.
In the prior art, in the process of preparing high manganese steel, furnace slag agents are covered on the surface of high manganese molten steel in the smelting process to remove impurities, but the effect of reducing harmful gases such as oxygen, hydrogen and the like is slightly poor, so that a novel furnace slag agent needs to be further explored so as to improve the removal effect of the harmful gases such as oxygen, hydrogen and the like and prepare high-purity high manganese steel.
Disclosure of Invention
The invention provides a furnace slag agent and an application method thereof in refining high-purity ultrahigh manganese steel, which aim to solve the problem that in the process of preparing high manganese steel in the prior art, the furnace slag agent covers the surface of high manganese molten steel in the smelting process to remove impurities, but the effect of reducing harmful gases such as oxygen, hydrogen and the like is slightly poor.
In order to solve the technical problems, the invention adopts the following technical scheme:
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.
Preferably, the particle size of the lime powder is 600-800 meshes.
Preferably, the particle size of the active kaolin powder is 800-1000 meshes.
Preferably, the particle size of the montmorillonite powder is 800-1000 meshes.
Preferably, the particle size of the calcium aluminate powder is 700-900 meshes.
Preferably, the particle size of the barium carbonate powder is 700-1000 meshes.
Preferably, the particle size of the yttrium oxide powder is 900-1100 meshes.
Preferably, the particle size of the fluorite powder is 800-1000 meshes.
Preferably, the particle size of the wollastonite powder is 800-1000 meshes.
The invention also provides an application method of the furnace slag agent in refining high-purity ultrahigh manganese steel, which 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: gradually putting the prepared raw materials into an intermediate frequency furnace for smelting, starting to open a flow regulator to blow and inject argon when furnace burden is molten to form a molten pool, namely high manganese molten steel covers over 28.6cm of the furnace bottom, wherein the argon is mixed with the molten steel through air bricksThe process of smelting the high manganese steel with water comprises the following steps: controlling the flow rate of argon gas to be 0.99-1.04Nm in the first 7-12min3H; controlling argon flow to be 1.13-1.25Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.28-1.47Nm in 19-28min3H; covering the surface of the high manganese molten steel with a furnace slag agent at the beginning of 29min, wherein the addition amount is 0.62-0.65 kg/ton steel; controlling the flow rate of argon gas to be 1.32-1.41Nm 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 ultrahigh manganese steel, and adopting spectral analysis, wherein the high-purity ultrahigh manganese steel comprises the following components in percentage by mass: 1.12 to 1.31 percent of C, 0.48 to 0.65 percent of Si, 30.25 to 35.01 percent of Mn, 1.24 to 2.46 percent of Cr, 0.32 to 0.81 percent of Cu, 0.09 to 0.17 percent of Al, 0.15 to 0.63 percent of Mo, 0.08 to 0.13 percent of Ni, 0.02 to 0.06 percent of W, O with the element content less than or equal to 0.00094 percent, the H element content less than or equal to 0.00038 percent, the other trace elements less than or equal to 0.91 percent, and the balance of Fe.
The invention has the following beneficial effects:
the active white earth powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder in the raw materials of the furnace slag agent play a synergistic role in preparing the ultrahigh 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 be proper in amountCan improve the hydrogen absorption capacity of the furnace slag melting agent department on the ultrahigh 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, the invention effectively reduces the hydrogen and oxygen contents and synergistically improves the yield strength of the ultrahigh manganese steel under the mutual cooperation of the active white earth powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder.
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.
Example 1
The furnace slag agent comprises the following raw materials in parts by weight: 22 parts of lime powder, 13 parts of active white soil powder, 7 parts of montmorillonite powder, 16 parts of calcium aluminate powder, 9 parts of barium carbonate powder, 4 parts of yttrium oxide powder, 8 parts of fluorite powder, 10 parts of wollastonite powder and 13 parts of medical stone powder;
the granularity of the lime powder is 600 meshes;
the granularity of the active kaolin powder is 900 meshes;
the granularity of the montmorillonite powder is 800 meshes;
the particle size of the calcium aluminate powder is 800 meshes;
the granularity of the barium carbonate powder is 700 meshes;
the granularity of the yttrium oxide powder is 900 meshes;
the granularity of the fluorite powder is 800 meshes;
the particle size of the wollastonite powder is 900 meshes;
the granularity of the medical stone powder is 800 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 120 parts of water at the same time, and stirring at the rotating speed of 300r/min for 1.5h 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 1cm after vacuum suction filtration molding;
s3: and (4) feeding the granules prepared in the step S2 into an oven, and drying at 85 ℃ until the water content is 1.2% to prepare the furnace slag agent.
The product is detected physically: the melting point was 1352 ℃.
The furnace slag agent prepared in example 2 is used for smelting ultra-high manganese steel for practical use. The dosage is 0.65 kg/ton steel. According to the observation: the product has good auxiliary extensibility, can be directly reacted with the residues to reduce the melting point and viscosity of the residues, and a temperature measuring gun can easily and quickly measure the temperature of the high manganese steel water through a residue layer; meanwhile, after the furnace slag agent is used, the average temperature drop of steel in each furnace is reduced by 5.1 ℃ compared with the situation that the original steel furnace is simply covered with a heat preservation agent; improves the slag fluidity, reduces the links of slag skimming and removes the slag adhered on the furnace wall. It can be seen that the furnace slag agent prepared in example 2 has a low melting point and high activity.
Example 2
The furnace slag agent comprises the following raw materials in parts by weight: 28 parts of lime powder, 16 parts of active white soil powder, 8 parts of montmorillonite powder, 18 parts of calcium aluminate powder, 9 parts of barium carbonate powder, 5 parts of yttrium oxide powder, 9 parts of fluorite powder, 10 parts of wollastonite powder and 14 parts of medical stone powder;
the granularity of the lime powder is 800 meshes;
the granularity of the active kaolin powder is 800 meshes;
the granularity of the montmorillonite powder is 800 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 900 meshes;
the particle size of the wollastonite powder is 900 meshes;
the granularity of the medical stone powder is 800 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 120 parts of water at the same time, and stirring at the rotating speed of 400r/min for 1.3h 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 1cm after vacuum suction filtration molding;
s3: and (4) feeding the granules prepared in the step S2 into an oven, and drying at 88 ℃ until the water content is 1.1% to prepare the furnace slag agent.
The product is detected physically: the melting point was 1324 ℃.
The furnace slag agent prepared in example 1 was used for practical use in the smelting of ultra-high manganese steel. The amount used was 0.63kg per ton of steel. According to the observation: the product has good auxiliary extensibility, can be directly reacted with the residues to reduce the melting point and viscosity of the residues, and a temperature measuring gun can easily and quickly measure the temperature of the high manganese steel water through a residue layer; meanwhile, after the furnace slag agent is used, the average temperature drop of steel in each furnace is reduced by 4.7 ℃ compared with the situation that the original steel furnace is simply covered with a heat preservation agent; improves the slag fluidity, reduces the links of slag skimming and removes the slag adhered on the furnace wall. It can be seen that the furnace slag agent prepared in example 4 has a low melting point and a high activity.
Example 3
The furnace slag agent comprises the following raw materials in parts by weight: 32 parts of lime powder, 18 parts of active white earth powder, 9 parts of montmorillonite powder, 20 parts of calcium aluminate powder, 12 parts of barium carbonate powder, 5 parts of yttrium oxide powder, 10 parts of fluorite powder, 11 parts of wollastonite powder and 15 parts of medical stone powder;
the granularity of the lime powder is 700 meshes;
the granularity of the active kaolin powder is 900 meshes;
the granularity of the montmorillonite powder is 900 meshes;
the particle size of the calcium aluminate powder is 800 meshes;
the granularity of the barium carbonate powder is 800 meshes;
the granularity of the yttrium oxide powder is 1000 meshes;
the particle size of the fluorite powder is 900 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 140 parts of water at the same time, and stirring at the rotating speed of 400r/min for 1.3h 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 1.2cm 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% to prepare the furnace slag agent.
The product is detected physically: the melting point was 1316 ℃.
The furnace slag agent prepared in example 1 was used for practical use in the smelting of ultra-high manganese steel. The amount used was 0.62 kg/ton steel. According to the observation: the product has good auxiliary extensibility, can be directly reacted with the residues to reduce the melting point and viscosity of the residues, and a temperature measuring gun can easily and quickly measure the temperature of the high manganese steel water through a residue layer; meanwhile, after the furnace slag agent is used, the average temperature drop of steel in each furnace is reduced by 4.6 ℃ compared with the situation that the original steel furnace is simply covered with a heat preservation agent; improves the slag fluidity, reduces the links of slag skimming and removes the slag adhered on the furnace wall. It can be seen that the furnace slag agent prepared in example 1 has a low melting point and high activity.
Example 4
The furnace slag agent 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.
The product is detected physically: the melting point is 1335 ℃.
The furnace slag agent prepared in example 3 was used for practical use in the smelting of ultra-high manganese steel. The amount used was 0.64kg per ton of steel. According to the observation: the product has good auxiliary extensibility, can be directly reacted with the residues to reduce the melting point and viscosity of the residues, and a temperature measuring gun can easily and quickly measure the temperature of the high manganese steel water through a residue layer; meanwhile, after the furnace slag agent is used, the average temperature drop of steel in each furnace is reduced by 4.8 ℃ compared with the situation that the original steel furnace is simply covered with a heat preservation agent; improves the slag fluidity, reduces the links of slag skimming and removes the slag adhered on the furnace wall. It can be seen that the furnace slag agent prepared in example 3 has a low melting point and a high activity.
Example 5
An application method of a furnace slag agent in refining high-purity ultrahigh 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 the furnace bottom by 28.6cm, 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 the flow rate of argon gas to be 0.99-1.04Nm in the first 7-12min3H; controlling argon flow to be 1.13-1.25Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.28-1.47Nm in 19-28min3H; covering the surface of the high manganese molten steel with a furnace slag agent at the beginning of 29min, wherein the addition amount is 0.65 kg/ton of steel; controlling the flow rate of argon gas to be 1.32-1.41Nm 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 ultrahigh manganese steel, and adopting spectral analysis, wherein the high-purity ultrahigh manganese steel comprises the following components in percentage by mass: 1.24% of C, 0.57% of Si, 33.12% of Mn, 1.75% of Cr, 0.64% of Cu, 0.12% of Al, 0.41% of Mo, 0.09% of Ni, 0.05% of W, O element content of 0.00094% of H element content of 0.00038% of H element content of 0.91% of other trace elements and the balance of Fe.
The furnace slag agent prepared in the step (5) is the furnace slag agent prepared in the embodiment 1, and comprises the following raw materials in parts by weight: 22 parts of lime powder, 13 parts of active white soil powder, 7 parts of montmorillonite powder, 16 parts of calcium aluminate powder, 9 parts of barium carbonate powder, 4 parts of yttrium oxide powder, 8 parts of fluorite powder, 10 parts of wollastonite powder and 13 parts of medical stone powder;
the granularity of the lime powder is 600 meshes;
the granularity of the active kaolin powder is 900 meshes;
the granularity of the montmorillonite powder is 800 meshes;
the particle size of the calcium aluminate powder is 800 meshes;
the granularity of the barium carbonate powder is 700 meshes;
the granularity of the yttrium oxide powder is 900 meshes;
the granularity of the fluorite powder is 800 meshes;
the particle size of the wollastonite powder is 900 meshes;
the granularity of the medical stone powder is 800 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 120 parts of water at the same time, and stirring at the rotating speed of 300r/min for 1.5h 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 1cm after vacuum suction filtration molding;
s3: and (4) feeding the granules prepared in the step S2 into an oven, and drying at 85 ℃ until the water content is 1.2% to prepare the furnace slag agent.
Comparative example 1
The method for preparing the ultra-high manganese steel is basically the same as that of the method for preparing the ultra-high manganese steel in the example 5, 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 2
The method for manufacturing ultra-high manganese steel of example 5 was substantially the same except that the raw material for manufacturing the furnace slag agent was deficient in the active clay powder.
Comparative example 3
The method for preparing the ultra-high manganese steel was substantially the same as that of example 5, except that calcium aluminate powder was absent from the raw material for preparing the furnace slag agent.
Comparative example 4
The method for manufacturing the ultra-high manganese steel was substantially the same as that of example 5, except that fluorite powder was absent from the raw material for manufacturing the furnace slag agent.
Comparative example 5
The process for producing ultra-high manganese steel was substantially the same as that of example 5 except that wollastonite powder was absent from the raw material for producing the slag melting agent.
Comparative example 6
The method for manufacturing the ultra-high manganese steel was substantially the same as that of example 5, except that the raw material for manufacturing the furnace slag agent was deficient in the medical stone powder.
Comparative example 7
The method for preparing the ultra-high manganese steel is basically the same as the method for preparing the ultra-high manganese steel in the example 5, except that the furnace slag agent is not added for impurity removal in the charging smelting in the step (5).
The yield strength and the oxygen and hydrogen contents of the ultrahigh manganese steels prepared in the example 5 and the comparative examples 1 to 7 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:
Figure BDA0003299326090000131
Figure BDA0003299326090000141
note: "-" indicates no inspection.
From the above table, it can be seen that: (1) as can be seen from the data of the example 5 and the comparative example 7, the content of hydrogen and oxygen can be effectively reduced and the yield strength of the ultrahigh manganese steel is improved by removing impurities by using the furnace slag agent in the charging and smelting process, wherein the oxygen content of the ultrahigh manganese steel prepared by the process of the example 5 is 9.4ppm, the hydrogen content is 3.8ppm and the yield strength is 498.7MPa, so that the yield strength of the ultrahigh manganese steel prepared by the process of the invention is higher.
(2) From the yield strength data of example 5 and comparative example 1, the effect value of yield strength generated when the active white earth powder, calcium aluminate powder, fluorite powder, wollastonite powder and medical stone powder are used together is 498.7-342.5-156.2 (MPa); from the yield strength data of example 5 and comparative example 2, the effect values of yield strength produced by the activated clay powder alone, 498.7-467.9-30.8 (MPa), can be calculated; from the yield strength data of example 5 and comparative example 3, the effect value of yield strength produced by calcium aluminate powder alone, 498.7-480.4-18.3 MPa), can be calculated; from the yield strength data of example 5 and comparative example 4, the effect value of yield strength produced by fluorite powder alone, 498.7-463.1-35.6 (MPa), can be calculated; from the yield strength data of example 5 and comparative example 5, the effect value of yield strength produced by wollastonite powder alone, 498.7-475.6-23.1 (MPa), can be calculated; from the yield strength data of example 5 and comparative example 6, the effect value of yield strength produced when the medical stone powder was used alone was 498.7-471.2-27.5 (MPa); by combining the data, the yield strength effect value generated by adding 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 30.8+18.3+35.6+23.1+ 27.5-135.3 (MPa), and in conclusion, the yield strength effect value generated by adding 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 yield strength effect value generated by adding 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, the yield strength is improved synergistically. 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 of the furnace slag agent to the ultrahigh manganese 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 molten steel. Therefore, the invention effectively reduces the hydrogen and oxygen contents and synergistically improves the yield strength of the ultrahigh manganese steel under the mutual cooperation of the active white earth powder, the calcium aluminate powder, the fluorite powder, the wollastonite powder and the medical stone powder.

Claims (10)

1. The furnace slag agent is characterized by comprising 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.
2. The furnace slag melting agent as defined in claim 1, wherein the lime powder has a particle size of 600-800 mesh.
3. The furnace slag melting agent as recited in claim 1, wherein the active clay powder has a particle size of 800-1000 mesh.
4. The furnace slag melting agent as recited in claim 1, wherein the montmorillonite powder has a particle size of 800-1000 mesh.
5. The furnace slag melting agent as defined in claim 1, wherein the calcium aluminate powder has a particle size of 700-900 mesh.
6. The furnace slag agent according to claim 1, wherein the barium carbonate powder has a particle size of 700-1000 mesh.
7. The furnace slag agent as claimed in claim 1, wherein the yttrium oxide powder has a particle size of 900-1100 mesh.
8. The furnace slag melting agent according to claim 1, wherein the fluorite powder has a particle size of 800-1000 mesh.
9. The furnace slag melting agent as recited in claim 1, wherein the wollastonite powder has a particle size of 800-1000 mesh.
10. Use of the furnace slag agent according to any one of claims 1 to 9 in the refining of high purity ultra high manganese steel, characterized by 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 28.6cm 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 the flow rate of argon gas to be 0.99-1.04Nm in the first 7-12min3H; controlling argon flow to be 1.13-1.25Nm in 13-18min3H; controlling the flow rate of argon gas to be 1.28-1.47Nm in 19-28min3H; covering the surface of the high manganese molten steel with a furnace slag agent at the beginning of 29min, wherein the addition amount is 0.62-0.65 kg/ton steel; controlling the flow rate of argon gas to be 1.32-1.41Nm 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 ultrahigh manganese steel, and adopting spectral analysis, wherein the high-purity ultrahigh manganese steel comprises the following components in percentage by mass: 1.12 to 1.31 percent of C, 0.48 to 0.65 percent of Si, 30.25 to 35.01 percent of Mn, 1.24 to 2.46 percent of Cr, 0.32 to 0.81 percent of Cu, 0.09 to 0.17 percent of Al, 0.15 to 0.63 percent of Mo, 0.08 to 0.13 percent of Ni, 0.02 to 0.06 percent of W, O with the element content less than or equal to 0.00094 percent, the H element content less than or equal to 0.00038 percent, the other trace elements less than or equal to 0.91 percent, and the balance of Fe.
CN202111186207.9A 2021-10-12 2021-10-12 Furnace slag agent and application method thereof in refining high-purity ultrahigh manganese steel Pending CN114134287A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152368A (en) * 2004-11-29 2006-06-15 Jfe Steel Kk Method for melting low carbon high manganese steel
CN102093114A (en) * 2011-01-28 2011-06-15 张震红 Medical stone multielement silicon fertilizer and preparation method thereof
CN105734197A (en) * 2016-02-25 2016-07-06 济南济钢铁合金厂 Novel environment-friendly synthetic slag forming material
CN109487178A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 High-purity ultra-high manganese steel and its preparation process
CN109487038A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 Slag making materials are used in the processing of potassium steel sublimate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152368A (en) * 2004-11-29 2006-06-15 Jfe Steel Kk Method for melting low carbon high manganese steel
CN102093114A (en) * 2011-01-28 2011-06-15 张震红 Medical stone multielement silicon fertilizer and preparation method thereof
CN105734197A (en) * 2016-02-25 2016-07-06 济南济钢铁合金厂 Novel environment-friendly synthetic slag forming material
CN109487178A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 High-purity ultra-high manganese steel and its preparation process
CN109487038A (en) * 2018-12-29 2019-03-19 广西长城机械股份有限公司 Slag making materials are used in the processing of potassium steel sublimate

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Application publication date: 20220304