CN110453032A - A method of utilizing the high ultralow manganese steel of manganese molten iron smelting - Google Patents
A method of utilizing the high ultralow manganese steel of manganese molten iron smelting Download PDFInfo
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- CN110453032A CN110453032A CN201910806190.9A CN201910806190A CN110453032A CN 110453032 A CN110453032 A CN 110453032A CN 201910806190 A CN201910806190 A CN 201910806190A CN 110453032 A CN110453032 A CN 110453032A
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- slag
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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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
- C21C7/072—Treatment with gases
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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
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- 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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Abstract
The invention discloses a kind of methods using the high ultralow manganese steel of manganese molten iron smelting, belong to field of steel metallurgy.Method provided by the invention using the high ultralow manganese steel of manganese molten iron smelting removes the elements such as the manganese in most of molten iron using the smelting process of double slags in kiln process, and using converter cold melt, the further demanganize of technique of LF refining furnace depth demanganize, it can be under conditions of entering furnace molten iron be the high manganese molten iron that manganese content is higher than 0.40%, by the manganese content stability contorting in molten steel 0.02% hereinafter, meeting the smelting needs of ultralow manganese steel.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to a method of using the high ultralow manganese steel of manganese molten iron smelting, especially
It is related to a kind of method of high ultralow manganese steel of manganese molten iron smelting using content greater than 0.40%.
Background technique
To meet the current market demand, requirement of the steel grade of the special steel material of high added value to Mn element in molten steel is very low,
And the demanganize ability of converter itself is limited, and most steel mills, due to the limitation of ore raw materials condition, the manganese content for entering furnace molten iron exists
0.40% or so, converter terminal reaches minimum manganese content and is when carrying out smelting ultralow manganese steel grade (Mn≤0.02%) with this molten iron
0.06% or so, it is unable to reach the requirement of such steel grade.In the above context, using high manganese molten iron smelting ultralow manganese steel grade this
Technical problem also just becomes to become increasingly conspicuous.Directly restrict using ingot iron as the exploitation and life of the ultralow manganese steel of representative
It produces.
Manganese can only be separated from molten iron or molten steel as a kind of metallic element by way of oxidative slagging；Its oxygen
Change-reduction reaction key is that the transmitting of oxygen and oxygen to reaction zone is provided to metallurgical system, realizes impurity element in molten iron
Direct or indirect oxidation.The selection of molten iron demanganize mode is generally limited by the raw materials used item of field device, environment, demanganize
Part etc..
Being limited to the factors such as the raw materials used condition of field device, environment, demanganize influences, from prior art angle,
Molten iron demanganize task is mainly completed in converter link, and summarizing the case where smelting ultralow manganese steel early period is: entering furnace molten iron manganese content collection
In at 0.39%-0.41% (average out to 0.40%), the residual manganese content of converter terminal is 0.050%-0.057% (average out to
0.054%), it is difficult to reach 0.05% even lower, the smelting of ultralow manganese steel can not be carried out.
In conclusion needing a kind of new method for being able to use the high ultralow manganese steel of manganese molten iron smelting, at present to guarantee in iron
It is smelted in the case that water bar part is relatively poor and controls manganese content stringenter high added value special steel.
Summary of the invention
In order to overcome existing smelting process not to be available the high manganese molten iron smelting ultralow manganese steel grade that manganese content is higher than 0.40%
Deficiency it is deeply de- originally to develop LF furnace the present invention provides a kind of method using the high ultralow manganese steel of manganese molten iron smelting
Preparation of manganese, the technique can smelt the molten steel that manganese content is lower than 0.02% by raw material of high manganese molten iron.
It, can only under conditions of entering furnace molten iron is the high manganese molten iron that manganese content is higher than 0.40% in conventional processing routes
By the manganese content stability contorting in molten steel below 0.06%.
The present invention carries out innovative optimization by the production technology to traditional LF refining furnace, so that manganese element is in LF furnace
Inside further removed.It is finally stable by 0.02% or less manganese content steady decrease in molten steel to.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A method of utilizing the high ultralow manganese steel of manganese molten iron smelting, comprising the following steps:
S1, converter use the smelting process of double slags
In converter treatment process using double slag process operate, the opportunity of falling slag selection in steel manganese, silicon oxidation terminate substantially, carbon
Oxidation since be suppressed be gradually transferred to will the fierce heat of oxidation when carry out down slag；Slag charge is added in slagging process
And iron sheet ball is effectively inhibited after bessemerizing by the control method of the big quantity of slag, outlet temperature and terminal oxygen in slagging process
" Hui Meng " phenomenon of phase；
S2, using converter cold melt, the technique of LF refining furnace depth demanganize
The wherein temperature of converter cold melt are as follows: 1560~1690 DEG C；
LF refining furnace depth demanganize includes slagging process twice: first time slag making and second of slag making.
Slag is carried out down when starting to blow 4min in above-mentioned steps S1；And/or
The additional amount of slag charge is 15-20t in slagging process and the additional amount of iron sheet ball is 5-20t.
In slagging process, outlet temperature control is controlled in 1560~1690 DEG C, terminal oxygen in 950ppm~1050ppm,
Effectively inhibit to bessemerize " Hui Meng " phenomenon in later period, manganese content is reduced to 0.06% or less in molten steel when converter tapping.
The temperature in place of the LF refining furnace of first time slag making described in above-mentioned steps S2 is 1520~1560 DEG C；Slag former
Additional amount is 8~12kg of ton steel, and refining heating temperature is 1590~1610 DEG C；Being heated to liquid steel temperature in refining temperature is 1590
At~1610 DEG C, the demanganize of steel ladle bottom argon blowing gas agitating is carried out；
The temperature in place of the LF refining furnace of second of slag making is 1520~1560 DEG C；The additional amount of slag former is ton steel
4~6kg, refining heating temperature are 1590~1610 DEG C；When it is 1590~1610 DEG C that refining temperature, which is heated to liquid steel temperature, into
Row steel ladle bottom argon blowing gas agitating demanganize.
The slag former of above-mentioned first time slag making and second of slag making is lime and the mixture for restructuring agent, wherein the lime
Proportionate relationship with restructuring agent is 9~12:0.8~1.5.
The argon gas intake of the steel ladle bottom argon blowing gas agitating demanganize of above-mentioned first time slag making and second of slag making is
1200L/min, argon gas are passed through the time as 6-10min.
It carries out taking off Slag treatment after the first time slag making of above-mentioned LF refining furnace.
Make conticaster molten steel manganese content steady decrease in place to 0.02% or less by above-mentioned LF refining furnace depth demanganize.
Based on above technical scheme, the method provided by the invention using the high ultralow manganese steel of manganese molten iron smelting is first in converter
Operated in treatment process using double slag process, the opportunity of falling slag selection in steel manganese, silicon oxidation terminates substantially, the oxidation of carbon is from being pressed down
System is gradually transferred to start to carry out down slag when the fierce heat of oxidation, to promote maximum manganese oxide to be removed, and guarantees to fall
Slag process is smooth.The consumption for increasing slag charge and iron sheet ball in slagging process, passes through the big quantity of slag, the terminal temperature in slagging process
The control method of degree and terminal oxygen, effectively inhibits " Hui Meng " phenomenon for bessemerizing the later period, can by the steel-making of double slag process technique
Manganese content in molten steel is reduced to 0.06% or less.Then on the basis of converter demanganize in the further demanganize of LF refining furnace,
Manganese content in molten steel is down to 0.05% hereinafter, to meet the needs of ultralow manganese steel, optimizes slag charge structure during LF refining
Proportion, simulate converter demanganize technique, LF furnace by converter not deoxidation tap, by slag-metal reaction make refinery cinder oxidation
Slag, by improving the quantity of slag, adjustment steel slag ingredient increases the capacity of the MnO of steel slag, to increase point of the manganese in steel slag and molten steel
Proportion, provides advantage for demanganize, LF refining furnace is made to have demanganize ability.During LF furnace electric arc heated, graphite
Carbon in electrode reacts to have obtained with the oxygen in slag makes good foamed slag, increases slag-steel interfacial area, enhancing demanganize reaction
Dynamic conditions, so that manganese be enable preferably to remove；And it is stirred using big argon gas, the dynamics item of enhancing demanganize reaction
Part accelerates slag-metal reaction, so that the manganese in molten steel be enable preferably to remove, final realize reduces steel during LF refining
The purpose of manganese content in water.
Compared with prior art, the invention has the following advantages:
The effect of converter demanganize can achieve 80%-85% in traditional handicraft, be higher than entering furnace molten iron for manganese content
Under conditions of 0.40% high manganese molten iron, can only by the manganese content stability contorting in molten steel 0.06% hereinafter, and the present invention is led to
Optimization LF refining charge composition is crossed, so that LF refining furnace has deep demanganize ability, the means such as intensified operation, so that manganese element is in LF
It is further removed in furnace, finally by 0.02% or less conticaster molten steel manganese content steady decrease in place to.
Specific embodiment
By following specific embodiments, the present invention will be described in detail.
In the specific embodiment of the present invention, a kind of method of high ultralow manganese steel of manganese molten iron smelting is provided, specifically
Include the following steps:
S1, the elements such as the manganese in most of molten iron are removed using double slag techniques
In converter treatment process using double slag process operate, the opportunity of falling slag selection in steel manganese, silicon oxidation terminate substantially, carbon
Oxidation since be suppressed be gradually transferred to will the fierce heat of oxidation when carry out down slag, to promote maximum manganese oxide quilt
It removes, and guarantees that the process of falling slag is smooth.The consumption for increasing slag charge and iron sheet ball in slagging process, by slagging process
The big quantity of slag, the control method of outlet temperature and terminal oxygen, effectively inhibit " Hui Meng " phenomenon for bessemerizing the later period, pass through double slags
Manganese content in molten steel can be reduced to 0.06% or less by the steel-making of method technique.
Wherein, slag is carried out down when starting to blow 4min；The additional amount of slag charge is 15-20t and iron sheet in slagging process
The additional amount of ball is 5-20t；In slagging process, outlet temperature control is in 1560~1690 DEG C, the control of terminal oxygen in 950ppm
~1050ppm.
S2, using converter cold melt, the technique of LF refining furnace depth demanganize
In the further demanganize of LF refining furnace on the basis of converter demanganize, by manganese content in molten steel be down to 0.05% hereinafter,
To meet the needs of ultralow manganese steel, optimize the proportion of slag charge structure during LF refining, simulate converter demanganize technique, LF furnace is logical
Converter not deoxidation tapping is crossed, refinery cinder oxidizing slag is made by slag-metal reaction, by improving the quantity of slag, adjustment steel slag ingredient increases
The capacity of the MnO of steel slag provides advantage for demanganize, makes LF refining to increase distribution ratio of the manganese in steel slag and molten steel
Stove is for demanganize ability.During LF furnace electric arc heated, the carbon in graphite electrode is reacted with the oxygen in slag to be made
Good foamed slag increases slag-steel interfacial area, the dynamic conditions of enhancing demanganize reaction, to keep manganese preferably de-
It removes；And be stirred using big argon gas, the dynamic conditions of enhancing demanganize reaction accelerates slag-metal reaction, to make in molten steel
Manganese preferably removed, it is final to realize the purpose that manganese content in molten steel is reduced during LF refining.
Wherein the temperature of converter cold melt is 1560~1690 DEG C in step S2；LF refining furnace includes slag making twice
Journey: first time slag making and second of slag making, wherein the temperature in place of the LF refining furnace of first time slag making is 1520~1560 DEG C；It makes
The additional amount of slag agent is 8~12kg of ton steel, and refining heating temperature is 1590~1610 DEG C；Liquid steel temperature is heated in refining temperature
When being 1590~1610 DEG C, the demanganize of steel ladle bottom argon blowing gas agitating is carried out；The temperature in place of the LF refining furnace of second of slag making is
1520~1560 DEG C；The additional amount of slag former is 4~6kg of ton steel, and refining heating temperature is 1590~1610 DEG C；In refining temperature
Be heated to liquid steel temperature be 1590~1610 DEG C when, carry out the demanganize of steel ladle bottom argon blowing gas agitating.
Wherein slag former is lime and the mixture for restructuring agent, and the weight ratio relationship of the two is 9~12:0.8~1.5.
The argon gas intake of the steel ladle bottom argon blowing gas agitating demanganize of first time slag making and second of slag making is 1200L/min, and argon gas is logical
The angle of incidence is 6-10min.
Embodiment 1
The molten iron for being 0.423% using manganese content carries out smelting demanganize, converter as raw material, using converter double slag process smelting process
Link cold melt is that preferable thermodynamic condition, 1529 DEG C of LF furnace temperature in place, LF furnace molten steel in place are created in further demanganize
Middle Mn content is 0.055%.4269kg lime is added during LF is smelted and refined, 329kg restructures agent, adds up 31 points of heating
Clock, manganese content is 0.0165% when offing normal, and design parameter is as shown in table 1 below.
Embodiment 2
The molten iron for being 0.416% using manganese content is smelted, converter link as raw material using converter double slag process smelting process
Cold melt creates preferable thermodynamic condition for further demanganize, 1527 DEG C of LF furnace temperature in place, Mn in LF furnace molten steel in place
Content is 0.049%.4442kg lime is added during LF is smelted and refined, 346kg restructures agent, heats 33 minutes, when offing normal
Manganese content is 0.0146%, and design parameter is as shown in table 1 below.
Embodiment 3
The molten iron for being 0.457% using manganese content is smelted, converter link as raw material using converter double slag process smelting process
Cold melt creates preferable thermodynamic condition for further demanganize, 1549 DEG C of LF furnace temperature in place, Mn in LF furnace molten steel in place
Content is 0.053%.3878kg lime is added during LF is smelted and refined, 286kg restructures agent, heats 26 minutes, when offing normal
Manganese content is 0.0136%, and design parameter is as shown in table 1 below.
In three above embodiment, enter furnace molten iron manganese content more than 0.40%, manganese content is still after converter demanganize
0.05% or less can not be down to.After the further demanganize of LF furnace, molten steel manganese content further declines, and is finally reached smelting mark
Standard is below 0.02%, and specific process parameter and technological effect are as shown in table 1 below.It can be seen that Gao Meng of the present invention by offer
The method of the ultralow manganese steel of molten iron smelting can be under conditions of entering furnace molten iron be the high manganese molten iron that manganese content is higher than 0.40%, will even
Casting machine molten steel manganese content steady decrease in place is to 0.02% or less.
Table 1
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of method using the high ultralow manganese steel of manganese molten iron smelting, which comprises the following steps:
S1, converter use the smelting process of double slags
In converter treatment process using double slag process operate, the opportunity of falling slag selection in steel manganese, silicon oxidation terminate substantially, the oxygen of carbon
Change since be suppressed be gradually transferred to will the fierce heat of oxidation when carry out down slag；Slag charge and iron are added in slagging process
Ball effectively inhibits to bessemerize the later period by the control method of the big quantity of slag, outlet temperature and terminal oxygen in slagging process
" Hui Meng " phenomenon；
S2, using converter cold melt, the technique of LF refining furnace depth demanganize
The wherein temperature of converter cold melt are as follows: 1560~1690 DEG C；
LF refining furnace depth demanganize includes slagging process twice: first time slag making and second of slag making.
2. the method according to claim 1, wherein carrying out down slag when starting to blow 4min in step S1.
3. the method according to claim 1, wherein the additional amount of slag charge is in slagging process in step S1
15-20t, the additional amount of iron sheet ball are 5-20t, outlet temperature control 1560~1690 DEG C, the control of terminal oxygen 950ppm~
1050ppm, effectively inhibits to bessemerize " Hui Meng " phenomenon in later period, when converter tapping in molten steel manganese content be reduced to 0.06% with
Under.
4. the method according to claim 1, wherein the LF refining furnace of first time slag making described in step S2 is just
Position temperature is 1520~1560 DEG C；The additional amount of slag former is 8~12kg of ton steel, and refining heating temperature is 1590~1610 DEG C；
When it is 1590~1610 DEG C that refining temperature, which is heated to liquid steel temperature, the demanganize of steel ladle bottom argon blowing gas agitating is carried out；
The temperature in place of the LF refining furnace of second of slag making is 1520~1560 DEG C；The additional amount of slag former be ton steel 4~
6kg, refining heating temperature are 1590~1610 DEG C；When it is 1590~1610 DEG C that refining temperature, which is heated to liquid steel temperature, carry out
Steel ladle bottom argon blowing gas agitating demanganize.
5. according to the method described in claim 4, it is characterized in that, the slag former of the first time slag making and second of slag making is
The mixture of lime and restructuring agent, wherein the lime and the proportionate relationship of restructuring agent are 9~12:0.8~1.5.
6. according to the method described in claim 4, it is characterized in that, the ladle bottom blowing of the first time slag making and second of slag making
The argon gas intake of argon gas stirring demanganize is 1200L/min, and argon gas is passed through the time as 6-10min.
7. according to the method described in claim 4, it is characterized in that, being taken off after the first time slag making of the LF refining furnace
Slag treatment.
8. the method according to any one of claim 4-7, which is characterized in that make continuous casting by LF refining furnace depth demanganize
Machine molten steel manganese content steady decrease in place is to 0.02% or less.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440916A (en) * | 2020-04-30 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Method for producing ultra-low manganese steel by using high-manganese molten iron converter |
| CN112342455A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Smelting method of industrial pure iron |
| CN114292981A (en) * | 2021-11-12 | 2022-04-08 | 安阳钢铁股份有限公司 | Method for smelting high-temperature low-manganese steel in later-stage converter campaign |
| CN114807507A (en) * | 2022-05-25 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Production method of ultralow-manganese steel |
| CN115247222A (en) * | 2021-04-28 | 2022-10-28 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron and ultralow manganese through pyrogenic process purification |
| CN115369205A (en) * | 2022-08-30 | 2022-11-22 | 鞍钢股份有限公司 | Low manganese steel converter blowing method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440916A (en) * | 2020-04-30 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Method for producing ultra-low manganese steel by using high-manganese molten iron converter |
| CN112342455A (en) * | 2020-10-28 | 2021-02-09 | 湖南华菱湘潭钢铁有限公司 | Smelting method of industrial pure iron |
| CN115247222A (en) * | 2021-04-28 | 2022-10-28 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron and ultralow manganese through pyrogenic process purification |
| CN115247222B (en) * | 2021-04-28 | 2023-11-24 | 河北龙凤山铸业有限公司 | Control method for preparing 4N-grade high-purity iron ultralow manganese through fire purification |
| CN114292981A (en) * | 2021-11-12 | 2022-04-08 | 安阳钢铁股份有限公司 | Method for smelting high-temperature low-manganese steel in later-stage converter campaign |
| CN114807507A (en) * | 2022-05-25 | 2022-07-29 | 湖南华菱湘潭钢铁有限公司 | Production method of ultralow-manganese steel |
| CN115369205A (en) * | 2022-08-30 | 2022-11-22 | 鞍钢股份有限公司 | Low manganese steel converter blowing method |
| CN115369205B (en) * | 2022-08-30 | 2023-08-18 | 鞍钢股份有限公司 | Converting method of low manganese steel converter |
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| CN110453032B (en) | 2021-06-22 |
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