CN115572886B - Production method for high-aluminum high-manganese steel with aluminum content - Google Patents

Production method for high-aluminum high-manganese steel with aluminum content Download PDF

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CN115572886B
CN115572886B CN202211303990.7A CN202211303990A CN115572886B CN 115572886 B CN115572886 B CN 115572886B CN 202211303990 A CN202211303990 A CN 202211303990A CN 115572886 B CN115572886 B CN 115572886B
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aluminum
steel
content
manganese steel
refining
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CN115572886A (en
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唐建平
卜祥海
宋海
郝振宇
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Beijing Baotou Steel Langrun New Material Technology Co ltd
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Beijing Baotou Steel Langrun New Material Technology 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
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • 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
    • C21C7/0006—Adding metallic additives
    • 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
    • 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
    • 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
    • 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

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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 discloses a production method for adding aluminum into high-aluminum high-manganese steel, which comprises the following process routes: converter-LF refining-vacuum degassing-one-time aluminum content adding-casting machine casting. The method changes the timing point of adding aluminum, reduces the nitrogen content in steel, only a part of aluminum reacts with nitrogen to produce aluminum nitride, and improves the yield of aluminum.

Description

Production method for high-aluminum high-manganese steel with aluminum content
Technical Field
The invention relates to the field of refining control processes, in particular to a production method for adding aluminum into high-aluminum high-manganese steel.
Background
In order to reduce the weight of automobile bodies, a large amount of advanced high-strength steel and advanced production technology are used, high-aluminum high-manganese austenitic steel is used as third-generation steel in the automobile industry, large steel factories are developed all over the country, high-aluminum high-manganese steel is steel taking aluminum as a main alloy element, and because a large amount of manganese (Mn: more than 15 percent) and aluminum element (AL: more than 1.0) form austenitic steel, the austenitic steel has unique properties such as stronger toughness and the like, and is favored by steel enterprises under the conditions of no scenic spot and low market in the steel industry. However, due to the addition of a large amount of manganese and aluminum, the temperature is reduced, long-time heating compensation of the LF furnace is needed, nitrogen in the air is absorbed by the molten steel, generally, when the aluminum content and the temperature of the added alloy of the LF furnace meet the requirements, the nitrogen content of steel types is about 200-300ppm, the nitrogen and the aluminum have stronger binding capacity, aluminum nitride inclusion is precipitated in the liquid state, and the steel is influenced. The invention discloses a production method for adding aluminum into high-aluminum high-manganese steel, belonging to a refining control process.
Disclosure of Invention
The invention aims to provide a production method for adding aluminum into high-aluminum high-manganese steel, which changes the timing point of adding aluminum, reduces the nitrogen content in steel, only partially reacts with nitrogen to produce aluminum nitride, and improves the yield of aluminum.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a production method for adding aluminum into high-aluminum high-manganese steel, which comprises the following process routes: converter-LF refining-vacuum degassing (VD/RH) -one-time addition of aluminum content-casting in a casting machine.
Further, the steel is mainly applicable to the chemical components and the weight percentage content of the steel are as follows: c:0.4% or more, mn:15% or more, 1.0% or more, and other alloying elements, the balance being Fe and unavoidable impurities.
Furthermore, an aluminum-free deoxidizer is adopted in the tapping process of the converter, and the aluminum deoxidizer is added according to the active oxygen content of the tapping, so that an aluminum deoxidizing mode in the original process is not adopted any more.
Further, in the LF refining process, the temperature and other alloy elements except AL are ensured to meet the design requirement of steel types, the slag of the LF refining furnace is controlled to be white slag, and the oxygen content of the steel types is controlled to be below 10 ppm; the LF refining procedure does not carry out aluminum content addition, at the moment, the nitrogen content in the molten steel is higher, and aluminum inclusion is easy to form by adding aluminum content.
Further, in the vacuum degassing (VD/RH) step, the vacuum degree is required to be 20 to 60Pa, the holding time is required to be 15 to 20 minutes, and the denitrification rate is required to be 80 to 92%. Too low vacuum degree or too long vacuum time, and is easy to cause loss of manganese content; proper vacuum degree and deep vacuum holding time are beneficial to high-efficiency denitrification.
Further, after the vacuum degassing procedure, aluminum components are added at one time, the aluminum components are added according to the component requirements, and the addition ratio of aluminum particles to aluminum ingots is 1:0.5-0.7.
Further, the molten steel is ensured not to be exposed and blown for 5-10 minutes, and the molten steel is poured on a casting machine.
Further, the addition ratio of aluminum particles to aluminum ingots is 1:0.6.
compared with the prior art, the invention has the beneficial technical effects that:
the high-aluminum high-manganese steel produced by the method only needs to be added with aluminum content once, the yield of aluminum alloy is high, and the operation time is short;
the high-aluminum high-manganese steel aluminum alloy produced by the method has the advantages that the yield is obviously improved, and the operation time is obviously shortened.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a metallographic phase of a prior art high aluminum high manganese steel;
FIG. 2 shows the metallurgical structure of the improved high-aluminum high-manganese steel.
Detailed Description
The invention aims to provide a production method for adding aluminum into high-aluminum high-manganese steel, which is mainly applicable to steel types, and comprises the following chemical components in percentage by weight: : c:0.4% or more, mn:15% or more, 1.0% or more, and other alloying elements, the balance being Fe and unavoidable impurities.
The process route is as follows: the process route and the original process route mainly improve the timing and the type of the aluminum to be added.
The prior process of adding aluminum content in the LF refining process and supplementing aluminum after the VD furnace is adopted, the yield of the aluminum content is 40-60%, the existing main aluminum adding mode adopts the gradual aluminum adding process in the LF refining process, and the nitrogen content in the air and the nitrogen content brought by adding a large amount of alloy are continuously absorbed in the LF refining process, and the manganese content is added in the aluminum adding process, so that a large amount of aluminum nitride inclusion is generated in steel, a part of aluminum nitride floats upwards, and a part of aluminum is left in the steel, so that the yield of the aluminum is lower, and the quality of steel billets is affected.
The invention has the outstanding advantages that the method is characterized in that the method is used for carrying out one-time aluminum component preparation under vacuum degassing (the vacuum degree is 20-60Pa, the holding time is 15-20 minutes, the denitrification rate is required to be 80-92%), the nitrogen content in steel is controlled below 40ppm, the oxygen content is controlled below 10ppm, the aluminum component is prepared according to the component requirement, and the adding ratio of aluminum particles (specification 3-5 mm) to aluminum ingots is 1: about 0.6, the yield is 90% +/-5%, the molten steel is ensured to be free from being exposed and blown for 5-10 minutes, and the casting machine is arranged to perform casting smoothly, and meanwhile, the steel requirement is met.
The invention will be further described with reference to specific examples
Example 1
The production method of the high-aluminum high-manganese steel with the aluminum content comprises the following steps:
the invention relates to a production method for adding aluminum into high-aluminum high-manganese steel, which is mainly applicable to the chemical components and the contents (weight percent) of steel types: c:0.4% or more, mn:15% or more, 1.0% or more, and other alloying elements, the balance being Fe and unavoidable impurities.
The production process flow of the original technology is as follows: converter (aluminum deoxidation) -LF furnace (primary dosing aluminum content) -vacuum degassing (VD/RH) -secondary or multiple dosing aluminum content-casting by casting machine.
The technological route for smelting the steel grade comprises the following steps: converter-LF furnace-vacuum degassing (VD/RH) -adding aluminium content-casting machine casting.
The invention relates to a production method for adding aluminum content into high-aluminum high-manganese steel, which adopts an aluminum-free deoxidizer in the tapping process of a converter, adds according to the active oxygen content of tapping, and does not adopt an aluminum deoxidizing mode in the original process.
By adopting the production method of the high-aluminum high-manganese steel with the aluminum content, in the LF refining process, the temperature and other alloy elements except for AL are ensured to reach the design requirement of steel types, the slag of the LF refining furnace is controlled to be white slag, and the oxygen content of the steel types is controlled to be below 10 ppm. The LF refining procedure does not carry out aluminum content addition, at the moment, the nitrogen content in the molten steel is higher, and aluminum inclusion is easy to form by adding aluminum content.
The invention relates to a production method for adding aluminum into high-aluminum high-manganese steel, which is characterized in that vacuum degassing (VD/RH) working procedure is carried out, the vacuum degree is required to be 20-60Pa, the holding time is 15-20 minutes, and the denitrification rate is required to be 80-92%. Too low vacuum degree or too long vacuum time, and is easy to cause loss of manganese content; proper vacuum degree and deep vacuum holding time are beneficial to high-efficiency denitrification.
After the vacuum degassing (VD/RH) working procedure, the aluminum component is added at one time, the aluminum particles (with the specification of 3-5 mm) and the aluminum ingot are added according to the component requirement, and the adding ratio of the aluminum particles to the aluminum ingot is 1: about 0.6, the yield is more than or equal to 70%, and the aluminum content yield can be stably maintained at the level of 90+/-5% under the condition that the oxygen content and the nitrogen content meet the requirements.
Ensuring that no molten steel is exposed and blown for 5-10 minutes, and pouring the molten steel on a casting machine.
Comparative example 1
The aluminum nitride inclusion which is commonly aggregated in the high-aluminum high-manganese steel produced by the original production process is in an aggregated state of clusters or strips after rolling of the continuous casting billet, so that the mechanical properties of the high-aluminum high-manganese steel are greatly damaged, and the appearance of the high-aluminum high-manganese steel is shown in figure 1.
The aluminum nitride inclusions in the high-aluminum high-manganese steel produced by the method provided by the invention are not in a cluster or strip type aggregation state, so that a fine dispersion inclusion distribution state is formed, and the morphology of the aluminum nitride inclusions is shown in figure 2.
As can be seen from the comparison of FIG. 1 and FIG. 2, the distribution and the morphology of the inclusions in the high-aluminum high-manganese steel produced by adopting the production method of adding aluminum into the high-aluminum high-manganese steel are obviously changed.
Comparative example 2
The high-aluminum high-manganese steel produced by the original production process adopts aluminum deoxidization, the LF refining process carries out primary aluminum content addition, the vacuum degassing process carries out secondary or multiple aluminum content addition, the aluminum content yield is lower, and the operation time is prolonged.
The high-aluminum high-manganese steel produced by adopting the production method for adding aluminum content into the high-aluminum high-manganese steel only needs to be added once, and the aluminum alloy has high yield and short operation time.
As can be seen from Table 1, the yield of the aluminum alloy of the high-aluminum high-manganese steel produced by the production method of adding aluminum into the high-aluminum high-manganese steel provided by the invention is obviously improved, and the operation time is obviously shortened.
Table 1 comparison of main indexes of the original production process and the production process of the present invention
Figure BDA0003905037960000061
The key improvement of the invention is as follows: after manganese is added from the original LF refining furnace, gradually adding aluminum content in the reheating and heating process, and after all requirements are met, carrying out vacuum degassing; the existing method is changed into the method that the aluminum content is added at one time after degassing, and the technical guarantee is oxygen content and nitrogen content and the proportion of aluminum iron to aluminum particles. Since the high-aluminum high-manganese steel reaches Mn: more than 15 percent of AL and 1.0 percent of AL are austenitic steel, have high elongation of more than 20 percent, are the characteristics of the steel, are not the invention, and the invention aims at the problem of aluminum addition in the process of producing the steel. Because the timing point of adding aluminum is changed, the nitrogen content in steel is reduced, only a part of aluminum reacts with nitrogen to produce aluminum nitride, the yield of aluminum is improved, and secondly, aluminum particles and aluminum iron are added to remove oxygen in steel and slag respectively, so that the yield is stable. According to the given figures 1 and 2, the first original process has a large amount of aluminum nitride in the steel and is aggregated, the yield of aluminum is low, the steel is affected, and after the second process is improved, the aluminum nitride is basically absent, so that the yield of aluminum is improved.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (6)

1. A production method for adding aluminum into high-aluminum high-manganese steel is characterized by comprising the following steps: the process route is as follows: converter-LF refining-vacuum degassing-one-time aluminum content adding-casting machine casting; after the vacuum degassing procedure, the aluminum component is added at one time according to the component requirement, and the adding ratio of aluminum particles to aluminum ingots is 1:0.5-0.7;
the steel comprises the following chemical components in percentage by weight: c:0.4% or more, mn:15% or more, 1.0% or more of Al, other alloying elements, and the balance of Fe and unavoidable impurities.
2. The method for producing the high-aluminum high-manganese steel with aluminum content according to claim 1, which is characterized in that: the aluminum-free deoxidizer is adopted in the tapping process of the converter, and is added according to the active oxygen content of the tapping, so that the aluminum deoxidizing mode in the original process is not adopted any more.
3. The method for producing the high-aluminum high-manganese steel with aluminum content according to claim 1, which is characterized in that: in the LF refining process, the temperature and other alloy elements except Al are ensured to meet the design requirement of steel types, the slag of the LF refining furnace is controlled to be white slag, and the oxygen content of the steel types is controlled to be below 10 ppm; the LF refining procedure does not carry out aluminum content addition.
4. The method for producing the high-aluminum high-manganese steel with aluminum content according to claim 1, which is characterized in that: in the vacuum degassing step, the vacuum degree is required to be 20-60Pa, the holding time is 15-20 minutes, and the denitrification rate is required to be 80-92%.
5. The method for producing the high-aluminum high-manganese steel with aluminum content according to claim 1, which is characterized in that: ensuring that no molten steel is exposed and blown for 5-10 minutes, and pouring the molten steel on a casting machine.
6. The method for producing the high-aluminum high-manganese steel with aluminum content according to claim 1, which is characterized in that: the addition ratio of aluminum particles to aluminum ingots is 1:0.6.
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CN107058681B (en) * 2017-03-03 2020-01-14 河钢股份有限公司 Method for improving yield of aluminum element in VD refining process
CN109161785A (en) * 2018-08-30 2019-01-08 武汉钢铁有限公司 The method for reducing B type impurity in al-free deoxidation steel
WO2022099680A1 (en) * 2020-11-16 2022-05-19 何满潮 Converter and continuously-cast small billet-based production method for npr rock bolt or anchor cable novel material
CN115094190B (en) * 2022-06-01 2023-08-08 包头钢铁（集团）有限责任公司 Ultralow-carbon steel smelting continuous casting production process of 100-ton dry type VD furnace

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