CN112813351B - High manganese steel and smelting method thereof - Google Patents

High manganese steel and smelting method thereof Download PDF

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CN112813351B
CN112813351B CN202110013551.1A CN202110013551A CN112813351B CN 112813351 B CN112813351 B CN 112813351B CN 202110013551 A CN202110013551 A CN 202110013551A CN 112813351 B CN112813351 B CN 112813351B
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steel
manganese
molten steel
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CN112813351A (en
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李广帮
廖相巍
尚德礼
常桂华
吕春风
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Angang Steel Co Ltd
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    • 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
    • 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
    • C21C7/072—Treatment with gases
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention relates to high manganese steel and a smelting method thereof, wherein the high manganese steel comprises the following chemical components: 0.32 to 0.38 percent of C, 0.18 to 0.28 percent of Si, 26 to 30 percent of Mn, less than or equal to 0.0030 percent of P, less than or equal to 0.0050 percent of S, 0.015 to 0.030 percent of Als, and the balance of iron and inevitable impurities; the smelting method of the high manganese steel comprises the processes of smelting, LF furnace refining, RH vacuum treatment and continuous casting; before the LF furnace refining treatment, adding the metal manganese with the manganese content of more than 95 percent of the manganese content of the high manganese steel finished product into the molten steel. On the premise of not increasing smelting equipment, the phosphorus content in the high manganese steel with the manganese content of 26-30% can be controlled at an ultralow level, continuous production can be realized, and the method has the advantages of simple process, stable and reliable production, low cost and high efficiency.

Description

High manganese steel and smelting method thereof
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to high manganese steel and a smelting method thereof.
Background
With the rapid development of science and technology, the industry has higher and higher requirements on the service performance and economic performance of metal materials. As is known, the alloy element plays an important role in improving the comprehensive performance of steel materials, for example, the alloy element Mn can obviously improve the strength and the wear resistance of steel, weaken the hot brittleness of the steel caused by overhigh S content so as to improve the hot workability of the steel, and also can improve the hardness and the strength of ferrite and austenite in the steel and increase the hardenability of the steel. In order to further improve the properties of steel, certain special alloy elements are purposefully added into carbon steel during smelting so as to form alloy steel with various special properties.
At present, alloy steel becomes an essential basic material in national defense construction and modernized infrastructure in China, and alloying of steel is one of the most important processes in steel production. Alloy steel is classified into structural alloy steel, tool alloy steel, special performance steel, special alloy steel, etc. according to its use. The main process for smelting alloy steel is to add alloy into molten steel in the form of ferroalloy or metal simple substance.
Mn has a function of enlarging a gamma phase region in steel to obtain a stable austenite structure. When the carbon content in the steel is constant, the structure of the steel gradually changes from a pearlite type to a martensite type and further to an austenite type as the manganese content increases. The low-temperature LNG marine steel mainly comprises nickel steel and stainless steel, a large amount of precious nickel resources are consumed in the manufacturing process, and the production cost is greatly increased. Manganese and nickel have similar properties in some respects, such as both being readily soluble in ferrite and austenite, thereby enlarging the austenite region; both reduced the critical temperature point a3, and the (α + γ) region was shifted downward. The manganese in China is abundant in resource and low in price, the steel plate can show the austenite structure characteristic at room temperature under the combined action of the manganese and other alloys, the face-centered cubic lattice is taken as a main part, the phenomenon that the steel plate is brittle at low temperature is avoided or reduced, and the steel plate can be used in an extremely low temperature range. Therefore, the research on the smelting method of the high manganese steel for the LNG ship has great economic benefit and social benefit. For high manganese steel, manganese further aggravates the segregation of phosphorus in the steel as the content of manganese increases, so that for high manganese steel with the manganese content of 26-30%, the phosphorus content in the steel needs to be strictly controlled below 0.0030%.
The Chinese patent application with the application number of 201910389922.9 discloses a method for smelting high manganese steel for LNG ships, which comprises the following steps: (1) primary smelting in a primary smelting furnace: the adding amount of pig iron and molten iron is more than or equal to 50t, the proportion of pig iron and molten iron in the primary smelting furnace capacity is more than or equal to 50 percent, and the P content of tapping molten steel is less than or equal to 0.004 percent; (2) refining in an LF furnace: adding metal manganese for alloying in multiple batches, and adjusting the adding times of the metal manganese according to the internal control components; (3) VD vacuum treatment: after VD seat packing, each alloy is adjusted according to a target value, and the adding times of the manganese metal are adjusted according to internal control components; (4) and (3) continuous casting process: controlling the superheat degree of the molten steel at 45-50 ℃, carrying out ladle casting, and carrying out subsequent processing on the steel billet to obtain the LNG marine high manganese steel. The invention controls the manganese content in the steel to be 22.5-25.5%, the purity of the molten steel is high, and the mechanical property is as follows: rp0.2 is more than or equal to 400MPa, Rm: 800-970MPa, A50 is more than or equal to 22 percent, and the low-temperature impact toughness AKV at minus 196 ℃ is more than or equal to 41J. According to the technical scheme, metal manganese is added into the LF for alloying in multiple batches, the adding times reach 9-18 times, the LF is heated by an electrode, the alloy and the steel slag are required to be melted and reduced, the heating rate of the electrode is low, only the alloy is melted, several hours are required, and the production cost is greatly increased; in addition, the production rhythm of the LF is slow, so that continuous casting is difficult to realize in production, and the limitation is very large.
The invention patent of China with the publication number of CN106086314B discloses a refining method for producing high manganese steel at low cost, manganese synthetic slag is added before tapping of a converter and in the process of refining molten steel, a reducing agent is added in the process of refining molten steel for desulfurization treatment, and an additive is added. The phosphorus impurity content of the prepared high manganese steel is obviously reduced, the cost of the process for producing the high manganese steel is obviously reduced, the use of ferromanganese is reduced, and the pollution or excessive labor consumption caused during the production of the ferromanganese is avoided. The high manganese steel produced by the technical scheme has the manganese content of 13%, the phosphorus content can only reach the level of 0.01%, and if the manganese content is higher, the phosphorus content is greatly increased and is difficult to be lower. In addition, in the refining process of the molten steel, the molten steel is heated to 1600 ℃, and then the manganese synthetic slag and the lime are added for dephosphorization treatment; adding aluminum powder and silicon carbide as reducing agents into the molten steel refining slag, stirring simultaneously until the refining slag becomes grey white, and how to treat the refining slag after removing phosphorus is not mentioned, and then adopting reduction operation, so that phosphorus in the slag can be returned to the molten steel again.
In a word, how to ensure the rapid melting of manganese alloy in the process of preparing high manganese steel and simultaneously control the extremely low phosphorus content cannot be realized in the prior art, so that the high manganese steel cannot be efficiently and high-quality produced.
Disclosure of Invention
The invention provides high manganese steel and a smelting method thereof, which can control the phosphorus content in the high manganese steel with the manganese content of 26-30% at an ultra-low level on the premise of not increasing smelting equipment, can realize continuous production, and has the advantages of simple process, stable and reliable production, low cost and high efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high manganese steel comprises the following chemical components: 0.32 to 0.38 percent of C, 0.18 to 0.28 percent of Si, 26 to 30 percent of Mn, less than or equal to 0.0030 percent of P, less than or equal to 0.0050 percent of S, 0.015 to 0.030 percent of Als, and the balance of iron and inevitable impurities; the mechanical property indexes of the high manganese steel are as follows: rp0.2：450～500MPa，Rm：980～1100MPa，A50:26 to 30 percent and low-temperature impact toughness A at minus 196 DEG CKV：47～52J。
A smelting method of high manganese steel comprises the processes of smelting, LF furnace refining, RH vacuum treatment and continuous casting; the method is characterized in that metal manganese with the manganese content of more than 95 percent of the manganese content of a high manganese steel finished product is added into the molten steel before the LF furnace refining treatment.
A smelting method of high manganese steel comprises the following specific steps:
1) preparing a heating agent;
mixing metal aluminum powder and iron oxide red according to the mass ratio of 1: 2.5-3.5 to prepare a heating agent for later use;
2) tapping steel from a steel ladle and adding manganese metal;
adding metal manganese into a ladle to be tapped, and adding 1/4-1/3 of the total amount of the metal manganese; then adding a heating agent, wherein the ratio of the addition amount of the heating agent to the amount of molten steel is 1: 45-55; filling a heating agent into 4-6 iron buckets with top openings, and uniformly distributing the iron buckets in steel ladles; adding 1/4-1/3 of the total amount of the metal manganese, and adding the rest metal manganese in the tapping process;
3) tapping at high temperature;
tapping when the temperature of the molten steel is increased to 1700-1730 ℃, wherein the phosphorus content of the tapped molten steel is controlled to be 0.0015-0.0026%; adding manganese metal before the molten steel is discharged to 3/4 total molten steel amount; melting metal manganese by using high-temperature molten steel and a heating agent, and fully alloying the molten steel; the slag discharging amount is controlled in the tapping process, so that the slag discharging amount does not exceed 3kg/t steel;
4) refining and alloying in an LF furnace;
when the LF furnace is refined, firstly, argon is communicated for bottom blowing, so that steel slag on the liquid level of the steel is activated; then heating the molten steel by adopting an electrode, raising the temperature, adding lime and bauxite for slagging, adding an aluminum wire section for reducing the molten steel, adjusting the temperature of the molten steel to 1550-1575 ℃, and taking out the molten steel from an LF furnace;
5) RH vacuum treatment;
the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are respectively ensured to be less than or equal to 0.0050%, less than or equal to 0.0020% and less than or equal to 0.0002%;
6) continuous casting of molten steel: and casting the molten steel by adopting a low superheat degree, wherein the superheat degree is controlled at 20-25 ℃.
The Al content of the metal aluminum powder is more than or equal to 98%, and the granularity is 80-150 meshes.
Fe in the iron oxide red2O3The content is more than or equal to 98 percent, and the granularity is 100-200 meshes.
The iron drums filled with the heating agent are distributed along the same circumference, the radius of the distributed circle is 0.4-0.6 r, and r is the radius of a steel ladle.
The manganese content of the metal manganese is more than or equal to 98 percent, and the phosphorus content is less than or equal to 0.0030 percent.
Compared with the prior art, the invention has the beneficial effects that:
1) the rapid melting of the manganese metal is realized before LF refining, so that the treatment time of the LF refining process is greatly reduced, the processes are coordinated and ordered, the continuous production is facilitated, and the process method is simple and stable and reliable in production;
2) on the premise of ensuring that the alloy is fully melted, no new smelting equipment is required to be added.
3) The phosphorus content is controlled to be extremely low while the high manganese content in the steel is realized, so that the comprehensive performance of the high manganese steel product is more excellent.
Detailed Description
The invention relates to high manganese steel, which comprises the following chemical components: 0.32 to 0.38 percent of C, 0.18 to 0.28 percent of Si, 26 to 30 percent of Mn, less than or equal to 0.0030 percent of P, less than or equal to 0.0050 percent of S, 0.015 to 0.030 percent of Als, and the balance of iron and inevitable impurities; the mechanical property indexes of the high manganese steel are as follows: rp0.2：450～500MPa，Rm：980～1100MPa，A50:26 to 30 percent and low-temperature impact toughness A at minus 196 DEG CKV：47～52J。
A smelting method of high manganese steel comprises the processes of smelting, LF furnace refining, RH vacuum treatment and continuous casting; the method is characterized in that metal manganese with the manganese content of more than 95 percent of the manganese content of a high manganese steel finished product is added into the molten steel before the LF furnace refining treatment.
A smelting method of high manganese steel comprises the following specific steps:
1) preparing a heating agent;
mixing metal aluminum powder and iron oxide red according to the mass ratio of 1: 2.5-3.5 to prepare a heating agent for later use;
2) tapping steel from a steel ladle and adding manganese metal;
adding metal manganese into a ladle to be tapped, and adding 1/4-1/3 of the total amount of the metal manganese; then adding a heating agent, wherein the ratio of the addition amount of the heating agent to the amount of molten steel is 1: 45-55; filling a heating agent into 4-6 iron buckets with top openings, and uniformly distributing the iron buckets in steel ladles; adding 1/4-1/3 of the total amount of the metal manganese, and adding the rest metal manganese in the tapping process;
3) tapping at high temperature;
tapping when the temperature of the molten steel is increased to 1700-1730 ℃, wherein the phosphorus content of the tapped molten steel is controlled to be 0.0015-0.0026%; adding manganese metal before the molten steel is discharged to 3/4 total molten steel amount; melting manganese metal by using high-temperature molten steel and a heating agent, and fully alloying the molten steel; the slag discharging amount is controlled in the tapping process, so that the slag discharging amount does not exceed 3kg/t steel;
4) refining and alloying in an LF furnace;
when the LF furnace is refined, firstly, argon is communicated for bottom blowing, so that steel slag on the liquid level of the steel is activated; then heating the molten steel by adopting an electrode, raising the temperature, adding lime and bauxite for slagging, adding an aluminum wire section for reducing the molten steel, adjusting the temperature of the molten steel to 1550-1575 ℃, and taking out the molten steel from an LF furnace;
5) RH vacuum treatment;
the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are respectively ensured to be less than or equal to 0.0050%, less than or equal to 0.0020% and less than or equal to 0.0002%;
6) continuous casting of molten steel: and casting the molten steel by adopting a low superheat degree, wherein the superheat degree is controlled at 20-25 ℃.
The Al content of the metal aluminum powder is more than or equal to 98%, and the granularity is 80-150 meshes.
Fe in the iron oxide red2O3The content is more than or equal to 98 percent, and the granularity is 100-200 meshes.
The iron barrels filled with the heating agent are distributed along the same circumference, the radius of the distribution circle is 0.4-0.6 r, and r is the radius of the steel ladle.
The manganese content of the metal manganese is more than or equal to 98 percent, and the phosphorus content is less than or equal to 0.0030 percent.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ example 1 ]
In the embodiment, before the LF furnace refining treatment, the manganese metal accounting for 98 percent of the manganese content of the high manganese steel finished product is added into the molten steel, so that the subsequent processes are convenient and orderly to operate, continuous production is realized, and the phosphorus content in the steel is controlled at the ultra-low phosphorus level; the smelting process of the high manganese steel is as follows:
1. preparing a heating agent: the heating agent is prepared from metal aluminum powder and iron oxide red, wherein the Al content in the metal aluminum powder is 98 percent, and the granularity is 80 meshes; fe in iron oxide red2O3The content is 98 percent, and the granularity is 150 meshes; according to the aluminum powder: preparing a heating agent according to the mass ratio of 1:2.5, and filling the prepared heating agent into 4 iron drums with openings at the tops for later use.
In this example, the ratio of the amount of the temperature increasing agent to the total amount of molten steel was 1: 50.
2. Tapping steel from a ladle and adding metal manganese: in a ladle for preparing tapping, firstly adding 1/3 parts of manganese metal in total addition, and then uniformly distributing 4 iron buckets filled with a heating agent on the same circumference in the ladle, wherein the circumference radius is 0.5r, and r is the ladle radius; then adding 1/4% manganese metal, adding the rest manganese metal into the steel ladle in the tapping process;
the manganese content in the added manganese metal is 99 percent, and the phosphorus content is 0.0020 percent.
3. High-temperature tapping: tapping when the temperature of the molten steel is raised to 1720 ℃, controlling the phosphorus content of the tapped molten steel to be 0.0020%, discharging the molten steel into a steel ladle filled with a heating agent, and adding metal manganese before discharging the molten steel to 3/4 of the total molten steel amount; the high-temperature molten steel and the heating agent are utilized to melt manganese metal, the molten steel is fully alloyed, and the slag discharge amount (in the embodiment, the slag discharge amount is 3kg/t steel) is controlled in the tapping process so as to control the rephosphorization amount in the refining process.
4. Refining and alloying in an LF (ladle furnace): during refining in the LF furnace, firstly, argon is communicated for bottom blowing to enable steel slag on the liquid level of the steel to be active, then, the temperature of the steel liquid is raised by adopting electrodes, lime and bauxite are added for slagging, an aluminum wire segment is added for reduction operation of the steel liquid, the components of the steel liquid are finely adjusted, after the steel slag is completely whitened, the temperature of the steel liquid is adjusted, and the steel liquid is moved out by the LF furnace when the temperature of the steel liquid is 1560 ℃.
5. RH vacuum treatment: the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are controlled to be 0.0045%, less than or equal to 0.0018% and 0.0002%, respectively.
6. Continuous casting of molten steel: and casting the molten steel at a low superheat degree, wherein the superheat degree is controlled at 25 ℃, and finally obtaining the ultra-low phosphorus high manganese steel.
The high manganese steel produced in this example had the main chemical components of C0.38%, Mn 29%, and P0.0030%. Excellent mechanical properties, wherein Rp0.2：487MPa，Rm：990MPa，A50: 30%, -196 ℃ low temperature impact toughness AKV：49J。
[ example 2 ] A method for producing a polycarbonate
In the embodiment, before the LF furnace refining treatment, metal manganese accounting for 96% of the manganese content of the high manganese steel finished product is added into the molten steel, so that the subsequent processes are convenient and orderly to operate, continuous production is realized, and the phosphorus content in the steel is controlled at an ultra-low phosphorus level; the smelting process of the high manganese steel is as follows:
1. preparing a heating agent: the heating agent is prepared from metal aluminum powder and iron oxide red, wherein the content of Al in the metal aluminum powder is 99%, and the granularity is 150 meshes; fe in iron oxide red2O3The content is 98 percent, and the granularity is 100 meshes; according to the aluminum powder: preparing a heating agent according to the mass ratio of 1:3.5, and filling the prepared heating agent into 6 iron drums with openings at the tops for later use.
In this example, the ratio of the amount of the temperature increasing agent to the total amount of molten steel was 1: 45.
2. Tapping steel into a ladle and adding metal manganese: firstly, adding 1/3 parts of manganese metal in total addition amount into a ladle for steel tapping, and then uniformly distributing 6 iron buckets filled with a heating agent on the same circumference in the ladle, wherein the circumference radius is 0.5r, and r is the ladle radius; then adding 1/3% manganese metal, adding the rest manganese metal into the steel ladle in the tapping process;
the manganese content in the added manganese metal is 98 percent, and the phosphorus content is 0.0030 percent.
3. High-temperature tapping: tapping when the temperature of the molten steel is raised to 1710 ℃, controlling the phosphorus content of the tapped molten steel to be 0.0025%, discharging the molten steel into a steel ladle filled with a heating agent, and finishing the addition of the manganese metal before discharging the molten steel to 3/4 of the total molten steel amount; the high-temperature molten steel and the heating agent are utilized to melt manganese metal, the molten steel is fully alloyed, and the slag discharge amount (in the embodiment, the slag discharge amount is 2kg/t steel) is controlled in the tapping process so as to control the rephosphorization amount in the refining process.
4. Refining and alloying in an LF (ladle furnace): when the LF furnace is refined, firstly, argon is communicated to conduct bottom blowing to enable steel slag on the liquid level to be active, then, the temperature of the molten steel is raised through electrodes, lime and bauxite are added to conduct slagging, an aluminum wire section is added to conduct reduction operation on the molten steel, the components of the molten steel are finely adjusted, after the steel slag is completely whitened, the temperature of the molten steel is adjusted, and the molten steel is moved out of the LF furnace when the temperature of the molten steel is 1550 ℃.
5. RH vacuum treatment: the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are controlled to be 0.0043%, less than or equal to 0.0017% and less than or equal to 0.0002%, respectively.
6. Continuous casting of molten steel: and casting the molten steel by adopting low superheat degree, wherein the superheat degree is controlled at 25 ℃, and the high manganese steel with ultralow phosphorus is obtained.
The high manganese steel produced by the embodiment has the main chemical components of 0.35 percent of C, 26 percent of Mn and less than or equal to 0.0030 percent of P. Excellent mechanical properties, wherein Rp0.2：495MPa，Rm：1080MPa，A50:29 percent and low-temperature impact toughness A at minus 196 DEG CKV：48J。
[ example 3 ]
In the embodiment, before the LF furnace refining treatment, metal manganese accounting for 97% of the manganese content of the high manganese steel finished product is added into the molten steel, so that the subsequent processes are convenient and orderly to operate, continuous production is realized, and the phosphorus content in the steel is controlled at an ultra-low phosphorus level; the smelting process of the high manganese steel is as follows:
1. preparing a heating agent: the heating agent is prepared by metal aluminum powder and iron oxide red, wherein the Al content in the metal aluminum powder is 98 percent, and the granularity is 100 meshes; fe in iron oxide red2O3The content is 99 percent, and the granularity is 200 meshes; according to the aluminum powder: preparing a heating agent according to the mass ratio of 1:3.0, and filling the prepared heating agent into 5 iron drums with openings at the tops for later use. In this example, the ratio of the amount of the temperature increasing agent to the total amount of molten steel was 1: 55.
2. Tapping steel into a ladle and adding metal manganese: in a ladle ready for tapping, firstly adding 1/4 parts of manganese metal in total addition, and then uniformly distributing 5 iron buckets filled with a heating agent on the same circumference in the ladle, wherein the circumference radius is 0.5r, and r is the ladle radius; adding 1/3 parts of manganese metal, and adding the rest manganese metal into a steel ladle in the tapping process;
the manganese content in the added manganese metal is 99 percent, and the phosphorus content is 0.0030 percent.
3. High-temperature tapping: tapping when the temperature of the molten steel is increased to 1730 ℃, controlling the phosphorus content of the tapped molten steel to be 0.0018%, discharging the molten steel into a steel ladle filled with a heating agent, and finishing the addition of the manganese metal before the molten steel is discharged to 3/4 of the total molten steel amount; the high-temperature molten steel and the heating agent are utilized to melt manganese metal, the molten steel is fully alloyed, and the slag discharge amount (in the embodiment, the slag discharge amount is 3kg/t steel) is controlled in the tapping process so as to control the rephosphorization amount in the refining process.
4. Refining and alloying in an LF (ladle furnace): during refining in the LF furnace, firstly, argon is communicated for bottom blowing to enable steel slag on the liquid level to be active, then, the temperature of the molten steel is raised by adopting an electrode, lime and bauxite are added for slagging, an aluminum wire section is added for reducing the molten steel, the components of the molten steel are finely adjusted, after the steel slag is completely whitened, the temperature of the molten steel is adjusted, and the molten steel is moved out of the LF furnace when the temperature of the molten steel is 1572 ℃.
5. RH vacuum treatment: and the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are controlled to be 0.0040 percent, less than or equal to 0.0019 percent and 0.0001 percent respectively.
6. Continuous casting of molten steel: and casting the molten steel by adopting low superheat degree, wherein the superheat degree is controlled at 20 ℃, and finally obtaining the ultra-low phosphorus high manganese steel.
The high manganese steel produced by the embodiment has the main chemical components of 0.33 percent of C, 28 percent of Mn and 0.0026 percent of P. Excellent mechanical properties, wherein Rp0.2：460MPa，Rm：1050MPa，A50: 27%, -196 ℃ C low-temperature impact toughness AKV：52J。
The above examples prove that, by adopting the method of the invention, the phosphorus content in the steel is further reduced while the high manganese content in the steel is ensured, so that the comprehensive performance of the high manganese steel is more excellent, and meanwhile, the manganese alloy is ensured to be smoothly added through chemical temperature rise, so that the refining time is greatly reduced, and the production rhythm is more reasonable and effective.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims (3)

1. The high manganese steel is characterized by comprising the following chemical components: 0.32 to 0.38 percent of C, 0.18 to 0.28 percent of Si, 26 to 28 percent of Mn, less than or equal to 0.0030 percent of P, less than or equal to 0.0050 percent of S, 0.015 to 0.030 percent of Als, and the balance of iron and inevitable impurities; the mechanical property indexes of the high manganese steel are as follows: rp 0.2: 450-500 MPa, Rm: 980-1100 MPa, A50: 26-30%, and low-temperature impact toughness AKV at-196 ℃: 47-52J;
the smelting method of the high manganese steel comprises the processes of smelting, LF furnace refining, RH vacuum treatment and continuous casting; the specific process is as follows:
1) preparing a heating agent;
mixing metal aluminum powder and iron oxide red according to the mass ratio of 1: 2.5-3.5 to prepare a heating agent for later use; the Al content of the metal aluminum powder is more than or equal to 98%, and the granularity is 80-150 meshes; fe in the iron oxide red2O3The content is more than or equal to 98 percent, and the granularity is 100-200 meshes;
2) tapping steel from a steel ladle, adding manganese metal, and adding the manganese metal with the manganese content of more than 95% of the manganese content of a high manganese steel finished product into molten steel before refining treatment in an LF (ladle furnace);
adding metal manganese into a ladle to be tapped, and adding 1/4-1/3 of the total amount of the metal manganese; then adding a heating agent, wherein the ratio of the addition amount of the heating agent to the amount of molten steel is 1: 45-55; filling a heating agent into 4-6 iron buckets with top openings, and uniformly distributing the iron buckets in steel ladles; adding 1/4-1/3 of the total amount of the metal manganese, and adding the rest metal manganese in the tapping process;
3) tapping at high temperature;
tapping when the temperature of the molten steel is increased to 1700-1730 ℃, wherein the phosphorus content of the tapped molten steel is controlled to be 0.0015-0.0026%; adding manganese metal before the molten steel is discharged to 3/4 total molten steel amount; melting metal manganese by using high-temperature molten steel and a heating agent, and fully alloying the molten steel; the slag discharging amount is controlled in the tapping process, so that the slag discharging amount does not exceed 3kg/t steel;
4) refining and alloying in an LF furnace;
when an LF furnace is refined, firstly, argon is communicated for bottom blowing to enable steel slag on the steel liquid level to be active; then heating the molten steel by adopting an electrode, raising the temperature, adding lime and bauxite for slagging, adding an aluminum wire section for reducing the molten steel, adjusting the temperature of the molten steel to 1550-1575 ℃, and taking out the molten steel from an LF furnace;
5) RH vacuum treatment;
the molten steel refined by the LF furnace enters an RH refining furnace for degassing treatment, so that gas and impurities in the molten steel are removed, the cleanliness of the molten steel is improved, and the nitrogen content, the oxygen content and the hydrogen content in the molten steel are respectively ensured to be less than or equal to 0.0050%, less than or equal to 0.0020% and less than or equal to 0.0002%;
6) continuous casting of molten steel: and casting the molten steel by adopting a low superheat degree, wherein the superheat degree is controlled at 20-25 ℃.
2. The high manganese steel of claim 1, wherein the iron buckets filled with the temperature raising agent are distributed along the same circumference, the radius of the distribution circle is 0.4-0.6 r, and r is the radius of the steel ladle.
3. The high manganese steel of claim 1, wherein the manganese metal has a manganese content of not less than 98% and a phosphorus content of not more than 0.0030%.
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CN1044959A (en) * 1990-02-23 1990-08-29 河南省巩县金江石厂 Low-aluminium silicon-titanium-iron alloy and manufacture method thereof
CN101429590A (en) * 2008-12-19 2009-05-13 北京科技大学 Process for producing twin crystal inducement plastic steel material with high carbon content
CN105908080A (en) * 2016-06-30 2016-08-31 东北大学 Preparation method for high-manganese steel for ocean platform and continuous casting slab of high-manganese steel
CN108504936A (en) * 2018-05-14 2018-09-07 东北大学 A kind of excellent high manganese cut deal and preparation method thereof of ultralow-temperature flexibility
JP2018204110A (en) * 2017-06-08 2018-12-27 新日鐵住金株式会社 Abrasion resistant thick steel plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1044959A (en) * 1990-02-23 1990-08-29 河南省巩县金江石厂 Low-aluminium silicon-titanium-iron alloy and manufacture method thereof
CN101429590A (en) * 2008-12-19 2009-05-13 北京科技大学 Process for producing twin crystal inducement plastic steel material with high carbon content
CN105908080A (en) * 2016-06-30 2016-08-31 东北大学 Preparation method for high-manganese steel for ocean platform and continuous casting slab of high-manganese steel
JP2018204110A (en) * 2017-06-08 2018-12-27 新日鐵住金株式会社 Abrasion resistant thick steel plate
CN108504936A (en) * 2018-05-14 2018-09-07 东北大学 A kind of excellent high manganese cut deal and preparation method thereof of ultralow-temperature flexibility

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