CN109778054A - A kind of process using high phosphorus hot metal production ultra-low phosphoretic steel - Google Patents

A kind of process using high phosphorus hot metal production ultra-low phosphoretic steel Download PDF

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CN109778054A
CN109778054A CN201910032100.5A CN201910032100A CN109778054A CN 109778054 A CN109778054 A CN 109778054A CN 201910032100 A CN201910032100 A CN 201910032100A CN 109778054 A CN109778054 A CN 109778054A
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steel
slag
molten
temperature
deoxidation
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CN109778054B (en
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杨峰
罗海明
张嘉华
刘少峰
陈�胜
魏晓东
段云波
董磊
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Baotou Iron and Steel Group Co Ltd
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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
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Abstract

The present invention relates to field of iron and steel smelting, and in particular to a kind of process using high phosphorus hot metal production ultra-low phosphoretic steel comprising: the pretreatment of KR molten iron；Converter smelting: for control finishing slag alkalinity ranges 3.0~4.5, terminal blowing temperature is 1600~1620 DEG C of ranges；Slag-stopping tapping: molten-steel deoxidation agent and slag deoxidizer are not added in tapping process；LF refining: making high alkalinity clinker, steel ladle bottom argon blowing gas agitating in refining process, liquid steel temperature is 1520~1560 DEG C；It skims, again slag making；Deoxidation treatment.The molten steel of molten iron production of the phosphorus content higher than 0.160% can be used in the technique, processes composition P element content can stably reach within 0.005%, it is minimum to can achieve 0.002%, it can satisfy requirement of each steel grade to molten steel composition P content, also the purpose of production ultra-low phosphoretic steel may be implemented, process control procedure is reliable and stable.

Description

A kind of process using high phosphorus hot metal production ultra-low phosphoretic steel
Technical field
The present invention relates to field of iron and steel smelting, in particular to a kind of technique side using high phosphorus hot metal production ultra-low phosphoretic steel Method.
Background technique
Phosphorus is the harmful element in steel, and phosphorus will lead to the raising of steel ductile-brittle transition temperature, deteriorate the impact flexibility of steel, cause cold It is crisp.Strong segregation element in phosphorus or steel, easily leads to center segregation of casting blank during molten steel solidification, causes slab middle crack. Phosphorus derives from ore used in iron-smelting raw material, and dephosphorization is one of the main task of steel-making.At present high-quality variety steel such as automobile steel, The products such as low temperature oil-gas pipeline steel, ingot iron require molten steel phosphorus content all very low.Steel plant are continuous in terms of cost control Reinforce, molten iron phosphorus content caused by the use of the high rock phosphate in powder of low cost is excessively high, proposes new challenge to process for making control.Cause This exploitation Ferrous Metallurgy new process further increases dephosphorization efficiency, and meeting requirement of the variety steel to molten steel composition phosphorus content becomes this The common objective of field technical staff.
Summary of the invention
In view of this, the present invention provides a kind of process with high phosphorus hot metal production ultra-low phosphoretic steel.
The present invention provides a kind of process using high phosphorus hot metal production ultra-low phosphoretic steel comprising following steps:
The pretreatment of KR molten iron: the content of the P in high phosphorus hot metal is greater than 0.160%；
Converter smelting: for control finishing slag alkalinity ranges 3.0~4.5, terminal blowing temperature is 1600~1620 DEG C of ranges；
Slag-stopping tapping: steel ladle bottom argon blowing gas agitating in tapping process, and molten-steel deoxidation agent and slag deoxidizer is not added；
LF refining: in refining process and high alkalinity clinker, steel ladle bottom argon blowing gas agitating are made, liquid steel temperature is 1520~1560 ℃；
It skims, again slag making；
Deoxidation treatment.
Further, in converter steelmaking process, control finishing slag basicity is 3.8, and terminal blowing temperature is 1612 DEG C.
Further, 1~2min of ladle bottom Argon gas agitating before tapping.
Further, it is 1530~1550 DEG C that liquid steel temperature is controlled during LF refining.
Further, deoxidation treatment specifically: aluminum shot is added into molten steel and carries out deoxidation.
Further, deoxidation treatment is carried out in LF station or RH station.
Compared with the existing technology, the process provided by the invention with high phosphorus hot metal production ultra-low phosphoretic steel has following excellent Point:
1, the condition needed for the thermodynamics and kinetics that liquid steel dephosphorization reacts devises completely new process for making stream Journey gives full play to the dephosphorisation reaction ability of smelting iron and steel each process, reduces molten steel phosphorus content to greatest extent.
2, initiative to devise the i.e. above-mentioned LF refining technique of the outer liquid steel dephosphorization of Converter, the comprehensive dephosphorization efficiency of molten steel can be with Reach 97% or more, can steady production P content be lower than 0.005% molten steel, minimum P content can achieve within 0.002%, It can satisfy requirement of each steel grade to molten steel P content.
3, by steel-making Task-decomposing to different processes, such as desulfurization task design is completed, in molten iron pre-desulfurization link in LF Furnace carries out dephosphorization treatment, can efficiently, collaboration, stable realization process for making control target, and it is raw that smelting iron and steel is effectively reduced Produce cost.
4, high phosphorus hot metal can be directly utilized using the process, produces Low-phosphorus Steel, it is pre- without carrying out dephosphorization of molten iron Processing is smelted using converter double slag process, to avoid that increased steel making working procedure and cost may be needed.
In conclusion the present invention according to metallurgical thermodynamics and principle of dynamics, sufficiently excavates, plays each process metallurgy unit Function, redesign, optimize process for making process, realize efficiently, collaboration, stable phosphor-removing effect.
Specific embodiment
The invention discloses a kind of processes using high phosphorus hot metal production ultra-low phosphoretic steel, and those skilled in the art can be with Present disclosure is used for reference, realization of process parameters is suitably modified.In particular, it should be pointed out that all similar substitutions and modifications are to ability It is it will be apparent that they are considered as being included in the present invention for field technique personnel.Method and application of the invention has been led to Preferred embodiment is crossed to be described, related personnel obviously can not depart from the content of present invention, in spirit and scope to this paper institute The methods and applications stated are modified or appropriate changes and combinations, carry out implementation and application the technology of the present invention.
The present invention provides a kind of process using high phosphorus hot metal production ultra-low phosphoretic steel, and height can be used using the technique The molten steel of phosphorus molten iron production, ingredient P element content can stably reach within 0.005%, minimum to can achieve 0.002%, can To meet requirement of each steel grade to molten steel composition P content.
Include the following steps:
The pretreatment of KR molten iron: the content of the P in molten iron used in the process can be that is, herein described greater than 0.160% High phosphorus hot metal；Specifically, the pretreatment can be the addition lime CaO and fluorite CaF into high phosphorus hot metal2Slag making desulfurization is simultaneously It is stirred.
Converter smelting: for control finishing slag alkalinity ranges 3.0~4.5, terminal blowing temperature is 1600~1620 DEG C of ranges；Control The effect for making above-mentioned process conditions is: building high-alkali low temperature environment, utilizes the low thermodynamic condition of initial smelting period liquid steel temperature On the one hand dephosphorization can reduce phosphorus content in molten steel, on the other hand with this condition, calcium phosphate only decomposites on a small quantity in slag P2O5, rephosphorization of molten steel measures control.As a preferred solution of the present invention, finishing slag basicity processed is 3.8, and terminal blowing temperature is 1612℃。
Slag-stopping tapping: steel ladle bottom argon blowing gas agitating in tapping process, and molten-steel deoxidation agent and slag deoxidizer is not added；Out Pushing off the slag technology is used when steel, it is preferable that tapping process is added lime and improves basicity of slag, avoids rephosphorization of molten steel after tapping；It tapped Be not added molten-steel deoxidation agent and slag deoxidizer in journey, keep molten steel and clinker high oxidative, by steel ladle bottom argon blowing gas agitating and Steel stream mixes up use to rushing for clinker in tapping process, promotes steel slag further to mix, continues dephosphorisation reaction.Into one Step ground, ladle bottom Argon 1~2min of gas agitating before tapping promote that while reaction between carbon and oxygen steel slag dephosphorisation reaction can continue It carries out.
LF refining: steel ladle bottom argon blowing gas agitating and making high alkalinity clinker in refining process, and liquid steel temperature is 1520~1560 ℃；In this process, it can be added etc. and to make high alkalinity clinker shoddye agent can further be added, to improve slag fluidity.It makes High alkalinity clinker, steel slag keeps high oxidative at this time, and for liquid steel temperature range in 1520~1560 DEG C of ranges, thermodynamic condition is advantageous It is carried out in dephosphorisation reaction, in addition in the entire treatment process of LF, steel ladle bottom argon blowing gas agitating provides good kinetics Condition, LF treatment process dephosphorization rate can achieve 80% or more, and phosphorus content can achieve 0.003% or less.As of the invention Preferred embodiment, liquid steel temperature are 1530~1550 DEG C, more preferably 1540 DEG C.
Skim, again slag making: its role is to avoid later period rephosphorization of molten steel, it is ensured that molten steel phosphorus content keeps stablizing.
Deoxidation treatment, which is specifically as follows, and aluminum shot progress deoxidation is added into molten steel.Deoxidation treatment can be in LF work It carries out, can also be carried out in RH station, can be designed according to steel grades in RH station and use light tupe, and utilize steel Middle carbon carrys out deoxidation, or using deep decarburization mode of manufacture ultra-low-carbon steel.
The present invention provide it is a kind of with high phosphorus hot metal production ultra-low phosphoretic steel process have the advantages that
1, the condition needed for the thermodynamics and kinetics that liquid steel dephosphorization reacts devises completely new process for making stream Journey gives full play to the dephosphorisation reaction ability of smelting iron and steel each process, reduces molten steel phosphorus content to greatest extent.
2, initiative to devise the i.e. above-mentioned LF refining technique of the outer liquid steel dephosphorization of Converter, the comprehensive dephosphorization efficiency of molten steel can be with Reach 97% or more, can steady production P content be lower than 0.005% molten steel, minimum P content can achieve within 0.002%, It can satisfy requirement of each steel grade to molten steel P content.
3, by steel-making Task-decomposing to different processes, such as desulfurization task design is completed, in molten iron pre-desulfurization link in LF Furnace carries out dephosphorization treatment, can efficiently, collaboration, stable realization process for making control target, and it is raw that smelting iron and steel is effectively reduced Produce cost.
4, high phosphorus hot metal can be directly utilized using the process, produces Low-phosphorus Steel, it is pre- without carrying out dephosphorization of molten iron Processing is smelted using converter double slag process, to avoid that increased steel making working procedure and cost may be needed.
In conclusion the present invention according to metallurgical thermodynamics and principle of dynamics, sufficiently excavates, plays each process metallurgy unit Function, redesign, optimize process for making process, realize efficiently, collaboration, stable phosphor-removing effect.
Below with reference to embodiment, the present invention is further explained:
Embodiment 1
The pretreatment of 1, KR molten iron: 7 furnace steel water labels of melting continuously production are followed successively by 1~7, after KR desulfurization pretreatment Enter furnace molten iron situation such as table 1, S content is 0.001%, and P content range is 0.155~0.167%.
1 KR desulfurization process fed to boiler molten iron situation (%) of table
2, converter smelting: control finishing slag basicity, terminal blowing temperature；Slag-stopping tapping, ladle bottom Argon gas mixing before tapping 1~2min is mixed, steel ladle bottom argon blowing gas agitating in tapping process, and molten-steel deoxidation agent and slag deoxidizer is not added；Converter smelting Outlet temperature, finishing slag basicity and tapping molten steel composition are listed in table 2.As shown in Table 2, tapping P content be 0.0065~ 0.0123%, average dephosphorization rate is 94.1%.It further, can be further at 1600~1620 DEG C by control outlet temperature P content is reduced to 0.01% hereinafter, the excessively high progress for being unfavorable for dephosphorisation reaction of temperature.
2 converter terminal of table goes out composition of steel (%), blowing end point temperature (DEG C) and finishing slag basicity
Label C P S Outlet temperature Finishing slag basicity
1 0.034 0.0092 0.0042 1617 3.0
2 0.038 0.0065 0.0036 1625 4.1
3 0.053 0.0063 0.0041 1612 3.8
4 0.037 0.0123 0.0034 1637 3.9
5 0.033 0.008 0.0034 1602 3.7
6 0.029 0.0118 0.0045 1616 3.2
7 0.044 0.0115 0.0026 1621 4.5
3, LF refining: steel ladle bottom argon blowing gas agitating and making high alkalinity clinker in refining process, liquid steel temperature and LF processing Molten steel composition is listed in table 3 afterwards.Such as table 3, after LF is handled, molten steel P content range is 0.0015~0.0045%, is existed 0.005% hereinafter, minimum can control 0.002% hereinafter, it is 70.8% that LF, which handles average dephosphorization rate,.Each process molten steel is comprehensive Dephosphorization rate reaches 98.2%, dephosphorization ultrahigh in efficiency.
3 LF of table takes off molten steel composition (%) after P processing
Label C P S Liquid steel temperature (DEG C)
1 0.034 0.0027 0.0048 1520
2 0.027 0.0017 0.0036 1530
3 0.037 0.0015 0.0039 1540
4 0.033 0.0045 0.0033 1530
5 0.031 0.0027 0.0043 1540
6 0.030 0.0028 0.0048 1550
7 0.033 0.0038 0.0024 1560
4, it skims, synthetic slag slag making again is added；
5, RH decarburization deoxidations: vacuum degree 90Pa, handle 20min, according to after decarburization oxygen content calculate be added aluminum shot into It is recycled in row deoxidation and equipment, handles 10min, molten steel composition is listed in table 4 after RH vacuum depth decarburization deoxidation.
4 RH of table offs normal molten steel composition (%)
Label C Si P S Alt
1 0.0005 0.002 0.0028 0.0047 0.022
2 0.0003 0.002 0.0021 0.0040 0.011
3 0.0004 0.001 0.0018 0.0041 0.014
4 0.0001 0.002 0.0048 0.0039 0.005
5 0.0001 0.002 0.0026 0.0040 0.015
6 0.0002 0.001 0.0029 0.0046 0.010
7 0.0007 0.002 0.0039 0.0033 0.019
Embodiment 2
The pretreatment of 1, KR molten iron: 4 furnace steel water labels of melting continuously production are followed successively by 8~11, through KR desulfurization pretreatment Fed to boiler molten iron situation such as table 5, S content is 0.001%, and P content range is 0.137~0.142%.
5 KR desulfurization process fed to boiler molten iron situation of table
Label Si (%) Mn (%) P (%) S (%) Temperature (DEG C)
8 0.37 0.57 0.141 0.001 1247
9 0.52 0.65 0.142 0.001 1280
10 0.50 0.60 0.137 0.001 1271
11 0.40 0.61 0.137 0.001 1276
2, converter smelting: control finishing slag basicity, terminal blowing temperature；Slag-stopping tapping, ladle bottom Argon gas mixing before tapping 1~2min is mixed, steel ladle bottom argon blowing gas agitating in tapping process, and molten-steel deoxidation agent and slag deoxidizer is not added；Converter smelting Outlet temperature, finishing slag basicity and tapping molten steel composition are listed in table 6.As shown in Table 2, tapping P content is 0.010~0.012%.
6 converter terminal of table goes out composition of steel (%) and blowing end point temperature (DEG C)
Label C Mn P S Outlet temperature
8 0.035 0.10 0.011 0.004 1601
9 0.033 0.09 0.010 0.004 1618
10 0.034 0.06 0.012 0.003 1615
11 0.033 0.06 0.011 0.003 1615
3, LF refining: steel ladle bottom argon blowing gas agitating and high alkalinity clinker is made in refining process, liquid steel temperature is followed successively by 1520 DEG C, 1530 DEG C, 1540 DEG C, 1550 DEG C.LF treatment process molten steel composition is listed in table 7.
7 LF treatment process molten steel composition (%) of table
4, RH decarburization deoxidations: vacuum degree 90Pa, handle 20min, according to after decarburization oxygen content calculate be added aluminum shot into It is recycled in row deoxidation and equipment, handles 10min, molten steel composition is listed in table 8 after RH vacuum depth decarburization deoxidation.Due to not doing Take off Slag treatment, RH treatment process is with the reduction of oxidisability in clinker, and phosphorus is restored in molten steel in clinker, and molten steel P is caused to contain Amount is increased.
8 RH of table offs normal molten steel composition (%)
Label C Si Mn P S Alt
8 0.0007 0.003 0.06 0.0030 0.0046 0.022
9 0.0005 0.001 0.05 0.0031 0.0048 0.013
10 0.0008 0.002 0.05 0.0044 0.0041 0.019
11 0.0005 0.001 0.05 0.0032 0.0043 0.014
As shown in the above, using dephosphorization technology new method provided by the invention, which can be used phosphorus content height In the molten steel of 0.160% molten iron production, processes composition P element content can be stably reached within 0.005%, minimum to reach To 0.002%, requirement of each steel grade to molten steel composition P content can satisfy, the purpose of production ultra-low phosphoretic steel, work also may be implemented Skill control process is reliable and stable.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (6)

1. a kind of process using high phosphorus hot metal production ultra-low phosphoretic steel, which comprises the steps of:
The pretreatment of KR molten iron: the content of the P in high phosphorus hot metal is greater than 0.160%；
Converter smelting: for control finishing slag alkalinity ranges 3.0~4.5, terminal blowing temperature is 1600~1620 DEG C of ranges；
Slag-stopping tapping: steel ladle bottom argon blowing gas agitating in tapping process, and molten-steel deoxidation agent and slag deoxidizer is not added；
LF refining: making high alkalinity clinker, steel ladle bottom argon blowing gas agitating in refining process, liquid steel temperature is 1520~1560 DEG C；
It skims, again slag making；
Deoxidation treatment.
2. process according to claim 1, which is characterized in that in converter steelmaking process, control finishing slag basicity is 3.8, terminal blowing temperature is 1612 DEG C.
3. process according to claim 1, which is characterized in that 1~2min of ladle bottom Argon gas agitating before tapping.
4. process according to claim 1, which is characterized in that control during LF refining liquid steel temperature be 1530~ 1550℃。
5. process according to claim 1, which is characterized in that deoxidation treatment specifically: aluminum shot is added into molten steel Carry out deoxidation.
6. requiring 5 process according to claim, which is characterized in that deoxidation treatment is carried out in LF station or RH station.
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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN112662839A (en) * 2020-12-11 2021-04-16 北京首钢股份有限公司 Method for producing ultra-low phosphorus steel by molten steel dephosphorization outside furnace
CN114318108A (en) * 2021-12-02 2022-04-12 包头钢铁（集团）有限责任公司 Production method of ultra-low-aluminum high-purity industrial pure iron
CN115247221A (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 by pyrogenic process purification and ultralow phosphorus
WO2022236900A1 (en) * 2021-05-20 2022-11-17 莱芜钢铁集团银山型钢有限公司 Low-cost smelting method for polar-use steel using ultra-high phosphorus molten iron

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Publication number Priority date Publication date Assignee Title
CN112662839A (en) * 2020-12-11 2021-04-16 北京首钢股份有限公司 Method for producing ultra-low phosphorus steel by molten steel dephosphorization outside furnace
CN115247221A (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 by pyrogenic process purification and ultralow phosphorus
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CN114318108A (en) * 2021-12-02 2022-04-12 包头钢铁（集团）有限责任公司 Production method of ultra-low-aluminum high-purity industrial pure iron

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