CN109280732A - A kind of high cleanliness acid-resistant pipeline steel smelting process - Google Patents

A kind of high cleanliness acid-resistant pipeline steel smelting process Download PDF

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Publication number
CN109280732A
CN109280732A CN201811329461.8A CN201811329461A CN109280732A CN 109280732 A CN109280732 A CN 109280732A CN 201811329461 A CN201811329461 A CN 201811329461A CN 109280732 A CN109280732 A CN 109280732A
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China
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steel
furnace
tapping
slag
cleanliness
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CN201811329461.8A
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曹余良
周贺贺
吴国平
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南京钢铁股份有限公司
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Publication of CN109280732A publication Critical patent/CN109280732A/en

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/064Dephosphorising; Desulfurising
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/076Use of slags or fluxes as treating agents
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C2007/0093Duplex process; Two stage processes
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a kind of high cleanliness acid-resistant pipeline steel smelting processes, it is related to metallurgical technology field, oxygen operation → RH furnace vacuum decarburization → RH furnace alloying and the anti-carburetting desulfurization rapidly technique → CCM process of vacuum outgas → LF refining furnace are stayed including molten iron ladle pouring → molten iron pretreatment → converter high-carbon hypoxemia, it is skimmed by desulfurizing iron, converter tapping stays the optimization of oxygen system and slagging regime, RH furnace vacuum decarburization and alloying technology, LF furnace diffusive deoxidation slag making and precipitation desoxydation, the whole reasonable ladle argon gas bottom blowing control of smelting process, give full play to the metallurgical thermodynamics and dynamic conditions of carbon content control and desulfurization, anti- carburetting desulfurization rapidly technique, LF furnace slag making desulfurization effect is obvious, and Molten Steel Cleanliness is high, slab quality is good, inclusion content control is 99% or more within 1.5 grades of steel plate.

Description

A kind of high cleanliness acid-resistant pipeline steel smelting process

Technical field

The present invention relates to metallurgical technology fields, more particularly to a kind of high cleanliness acid-resistant pipeline steel smelting process.

Background technique

Sulphur will cause adverse effect to the performance of steel, and sulfur content is high in steel, and the hot-working character of steel can be made to degenerate, that is, caused " hot-short " property of steel.With the development of science and technology, requirement of the society to steel material is also higher and higher, especially hic resistance and anti-H2S Corrode the exploitation for using steel, sulfur content requires within 0.0015% in steel, harsh sulfur content requirement, conventional smelting desulfurization work Skill cannot fully meet large-scale production needs.Especially part steel require low-sulfur while, in order to guarantee yield behavior and Welding performance, carbon content need to be controlled in lower range, and since converter carbon oxygen product is constant, converter depth carbon will lead to steel water oxygen Height is affected to converter lining, subsequent deep desulfurization and Molten Steel Cleanliness.Therefore, a kind of acid-resistant pipeline steel smelter is developed Skill becomes the development bottleneck of research and development high added value variety steel and benefit growth point.

Summary of the invention

In order to solve the above technical problems, the present invention provides a kind of high cleanliness acid-resistant pipeline steel smelting process, including

1. converter smelting process

Molten iron pretreatment operation: enter furnace molten iron through desulfurization pretreatment and skim clean, it is desirable that S≤0.002%;

Pushing off the slag operation: the lower quantity of slag≤2kg/t is controlled in tapping process;

Temperature and carbon content control: blowing end point temperature is greater than 1680 DEG C, terminal C >=0.040%;

Tapping slag making: lime is added in tapping process and pro-molten refining slag carries out ladle top slag, and pro-molten refining slag additional amount is 3kg/ Ton steel, lime adding amount are 5kg/ tons of steel;

Oxygen is stayed in tapping: metal manganese alloy is only added in tapping, and process uses the weak deoxidation of aluminium, i.e. secondary according to terminal oxygen content is bessemerized Aluminium block is added in rifle TSO value, and after aluminium block is added, Control for Oxygen Content is in 450ppm~550ppm in molten steel;Steel ladle bottom argon blowing gas control system: Tapping process ladle bottom blowing gas flow is 800NL/min, and the control of tapping time is in 5min~8min;

2. LF refining furnace smelting process

The processing of RH vacuum decarburization: after molten steel reaches RH furnace processing station, oxygen is determined in thermometric sampling, and temperature is greater than 1580 DEG C of progress vacuum Decarburization is added aluminum shot 1.5kg/ tons of molten steel at the end of reaction between carbon and oxygen and carries out deep deoxidation, continues vacuum and keeps 3min, according to steel grade Component requirements, are added ferrosilicon and metal manganese alloy carries out alloying;

RH Fruit storage: carrying out Fruit storage, vacuum degree≤85Pa after RH alloying, the retention time is greater than 20min, In RH whole process, ladle bottom blowing argon flow is controlled in 5NL/min~10NL/min, and vacuum terminates molten steel and is hung to the continuation of LF furnace Refining treatment;

The operation of the stokehold LF phase: after molten steel reaches processing station, ladle bottom blowing flow 300NL/min~400NL/min, power supply are adjusted 0.2kg/ tons of lime 2kg/ tons of steel, aluminium wire steel, sampling analysis, lower electrode heating are added after slugging 2min~3min;

LF furnace mid-term process control: according to first steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 3kg/ tons of steel, 0.2kg/ tons of steel of aluminium wire, sweetening process argon flow 200NL/min~300NL/ Min, feeding aluminum steel adjust molten steel aluminium content, feed aluminum steel and control argon flow 30NL/min~50NL/min, according to target steel grade Ingredient carry out alloying, heat up 6min~8min sampling analysis, lower electrode continue heat up desulfurization;

The control of LF furnace late stage: according to second steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 1kg/ tons of steel, 0.3kg/ tons of steel of aluminium wire, white i.e. FeO+MnO≤1.0% of slag discoloration, liquid steel temperature 1600 DEG C~1610 DEG C are increased to, electrode is promoted, covers refining furnace bell, steel ladle bottom argon blowing controlled atmosphere is whole to 800NL/min, carries out Argon gas stirs deep desulfurization 4min~5min, sampling analysis, based on the analysis results abundantization LF furnace mid-term process control flow;

Calcium treatment, that is, soft stirring: after molten steel composition temperature qualification, pure calcium line 1.6m/ tons of steel are fed in molten steel, Calcium treatment terminates Soft stirring is greater than 8min, soft stirring Bottom Blowing Flow Rate Control 20NL/min~30NL/min afterwards.

Technical effect: the present invention relates to smelt acid-resistant pipeline steel converter carbon, oxygen content, RH refining carbon content and LF refining furnace The technique of sulfur content control, is pre-processed by DESULPHURIZATION OF HOT METAL BY POWDER INJECTION, the optimization of converter tapping deoxidation system, RH depth decarburized alloy, Degassing, the optimization of LF refining furnace deoxidation system and slagging regime, sufficiently depth desulfurization reduce heating time, guarantee electrode carburetting.

The technical solution that the present invention further limits is:

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, slag making of tapping, pro-molten refining slag includes: CaO:45.0% ~55.0%, Al203: 27.0%~35.0%, SiO2≤ 6.0%, MgO≤8.0%, Fe2O3≤ 1.5%, H2O≤0.5%.

Oxygen, metal manganese alloy: 0.04%≤Mn are stayed in a kind of preceding high cleanliness acid-resistant pipeline steel smelting process, tapping ≤ 0.60%.

Oxygen is stayed in a kind of preceding high cleanliness acid-resistant pipeline steel smelting process, tapping, as TSO oxygen content < 550ppm, Aluminium block is not added;As 550ppm≤TSO oxygen content < 650ppm, aluminium block additional amount 30kg;As 650ppm≤TSO oxygen content < 750ppm, aluminium block additional amount 60kg;As 750ppm≤TSO oxygen content < 850ppm, aluminium block additional amount 90kg;When TSO oxygen content > 850ppm, aluminium block additional amount 120kg.

Oxygen is stayed in a kind of preceding high cleanliness acid-resistant pipeline steel smelting process, tapping, and the time is added in aluminium block are as follows: tapping is opened Slag material → tapping to 1/3 plus aluminium block → Mn series alloy → tapping is added within beginning → tapping 30 seconds to terminate.

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, RH vacuum decarburization processing, when temperature≤1580 DEG C When, it needs LF furnace to be warming up to 1620 DEG C or more and returns RH processing again.

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, the processing of RH vacuum decarburization, with RH vacuum degree by Normal atmosphere (An) starts to reduce, and molten steel decarburization starts, and when vacuum degree is reduced within 500Pa, reaction between carbon and oxygen terminates, time 6min ~9min.

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, the processing of RH vacuum decarburization, ferrosilicon and manganese metal Additional amount by steel grades lower limit with addition of.

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, LF furnace mid-term process control, at first steel sample Manage time 10min;The control of LF furnace late stage, second steel sample handle time 25min.

A kind of preceding high cleanliness acid-resistant pipeline steel smelting process, LF furnace mid-term process control, aluminum steel feed quantity with Aluminium content is maintained at 0.035%~0.045% to control in smelting process.

The beneficial effects of the present invention are:

(1) converter tapping of the present invention stays oxidation stability, and RH is reduced within 0.020% by reaction between carbon and oxygen carbon drop;

(2) LF furnace slag making desulfurization effect of the present invention is obvious, and slab quality is good, and steel plate Control and Inclusion Removal is preferable, guarantees high additional The production of the acid-resistant pipeline steel of value;

(3) present invention successfully solves acid-resistant pipeline steel (0.025%≤C≤0.050%, S≤0.0015%) steel-making and smelted The contradiction of the tapping of hyperoxia caused by journey converter depth decarburization is skimmed using molten iron pretreatment powder injection desulphurization, converter treatment process high-carbon Tapping, weak deoxidation carry out that oxygen is stayed to operate, and RH depth decarburized alloy, degassing, LF quickly makes white slag desulfurization, in conjunction with LF furnace smelting process Whole reasonable argon gas bottom blowing control and arc-covering slag operation, give full play to the metallurgical thermodynamics and dynamic conditions of desulfurization, simultaneously Prevent electrode carburetting;

(4) production process molten steel carbon of the present invention, sulfur content control are stablized, and are alleviated converter deep deoxidation high oxidative and are invaded furnace lining Erosion, reduces foreign substance in molten steel, and slab quality is good, and the amount of inclusions control is completely full 99% or more within 1.5 grades of product The super acid-resistant pipeline steel production requirement of foot guarantees to smelt rhythm of production and continuous casting furnace number.

Detailed description of the invention

Fig. 1 is process flow chart of the invention.

Specific embodiment

A kind of high cleanliness acid-resistant pipeline steel smelting process provided in this embodiment, including

1. converter smelting process

Molten iron pretreatment operation: enter furnace molten iron through desulfurization pretreatment and skim clean, it is desirable that S≤0.002%;

Pushing off the slag operation: the lower quantity of slag≤2kg/t is controlled in tapping process;

Temperature and carbon content control: blowing end point temperature is greater than 1680 DEG C, terminal C >=0.040%;

Tapping slag making: lime is added in tapping process and pro-molten refining slag carries out ladle top slag, and pro-molten refining slag additional amount is 3kg/ Ton steel, lime adding amount are 5kg/ tons of steel;

Oxygen is stayed in tapping: metal manganese alloy is only added in tapping, and process uses the weak deoxidation of aluminium, i.e. secondary according to terminal oxygen content is bessemerized Aluminium block is added in rifle TSO value, and after aluminium block is added, Control for Oxygen Content is in 450ppm~550ppm in molten steel;Steel ladle bottom argon blowing gas control system: Tapping process ladle bottom blowing gas flow is 800NL/min, and the control of tapping time is in 5min~8min;

2. LF refining furnace smelting process

The processing of RH vacuum decarburization: after molten steel reaches RH furnace processing station, oxygen is determined in thermometric sampling, and temperature is greater than 1580 DEG C of progress vacuum Decarburization is added aluminum shot 1.5kg/ tons of molten steel at the end of reaction between carbon and oxygen and carries out deep deoxidation, continues vacuum and keeps 3min, according to steel grade Component requirements, are added ferrosilicon and metal manganese alloy carries out alloying;

RH Fruit storage: carrying out Fruit storage, vacuum degree≤85Pa after RH alloying, the retention time is greater than 20min, In RH whole process, ladle bottom blowing argon flow is controlled in 5NL/min~10NL/min, and vacuum terminates molten steel and is hung to the continuation of LF furnace Refining treatment;

The operation of the stokehold LF phase: after molten steel reaches processing station, ladle bottom blowing flow 300NL/min~400NL/min, power supply are adjusted 0.2kg/ tons of lime 2kg/ tons of steel, aluminium wire steel, sampling analysis, lower electrode heating are added after slugging 2min~3min;

LF furnace mid-term process control: according to first steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 3kg/ tons of steel, 0.2kg/ tons of steel of aluminium wire, sweetening process argon flow 200NL/min~300NL/ Min, feeding aluminum steel adjust molten steel aluminium content, feed aluminum steel and control argon flow 30NL/min~50NL/min, according to target steel grade Ingredient carry out alloying, heat up 6min~8min sampling analysis, lower electrode continue heat up desulfurization;

The control of LF furnace late stage: according to second steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 1kg/ tons of steel, 0.3kg/ tons of steel of aluminium wire, white i.e. FeO+MnO≤1.0% of slag discoloration, liquid steel temperature 1600 DEG C~1610 DEG C are increased to, electrode is promoted, covers refining furnace bell, steel ladle bottom argon blowing controlled atmosphere is whole to 800NL/min, carries out Argon gas stirs deep desulfurization 4min~5min, sampling analysis, based on the analysis results abundantization LF furnace mid-term process control flow;

Calcium treatment, that is, soft stirring: after molten steel composition temperature qualification, pure calcium line 1.6m/ tons of steel are fed in molten steel, Calcium treatment terminates Soft stirring is greater than 8min, soft stirring Bottom Blowing Flow Rate Control 20NL/min~30NL/min afterwards.

By taking X70MS acid-resistant pipeline steel kind as an example, smelted in 150 tons of converters, 150 tons of ladle furnaces, X70MS pipe line steel chemistry at Divide and be shown in Table 1, entire smelting process control is as follows:

1 X70MS main chemical (%) of table

2 converter terminal ingredient (%) of table

Ingredient after 3 furnace of table

4 RH of table arrives at a station temperature and alloying situation

5 RH closure component (%) of table

6 refining furnace endpoint molten steel main ingredient (%) of table

7 refining furnace of table terminates slag composition (%)

21.5mm steel plate is rolled, referring to " measuring method of GBT 10516-2005 nonmetallic inclusionsin steel content ", to being mingled with Object grades 1.5 grades with inclusion accounting 100%, it is specific the ratings are as follows:

To sum up, present invention process uses: molten iron ladle pouring → molten iron pretreatment → converter high-carbon hypoxemia stays oxygen operation → RH furnace vacuum Decarburization → RH furnace alloying and the anti-carburetting desulfurization rapidly technique → CCM process of vacuum outgas → LF refining furnace, pass through desulfurizing iron It skims, converter tapping stays the optimization of oxygen system and slagging regime, RH furnace vacuum decarburization and alloying technology, and LF furnace diffusive deoxidation is made Slag and precipitation desoxydation, the whole reasonable ladle argon gas bottom blowing control of smelting process, give full play to the smelting of carbon content control and desulfurization Golden thermodynamics and kinetics condition, anti-carburetting desulfurization rapidly technique, LF furnace slag making desulfurization effect is obvious, realizes in molten steel The technology of 0.020%≤C≤0.050% and S≤0.0015%, and Molten Steel Cleanliness is high, slab quality is good, steel plate Inclusion content control is 99% or more within 1.5 grades.

In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (10)

1. a kind of high cleanliness acid-resistant pipeline steel smelting process, it is characterised in that: including
1. converter smelting process
Molten iron pretreatment operation: enter furnace molten iron through desulfurization pretreatment and skim clean, it is desirable that S≤0.002%;
Pushing off the slag operation: the lower quantity of slag≤2kg/t is controlled in tapping process;
Temperature and carbon content control: blowing end point temperature is greater than 1680 DEG C, terminal C >=0.040%;
Tapping slag making: lime is added in tapping process and pro-molten refining slag carries out ladle top slag, and pro-molten refining slag additional amount is 3kg/ Ton steel, lime adding amount are 5kg/ tons of steel;
Oxygen is stayed in tapping: metal manganese alloy is only added in tapping, and process uses the weak deoxidation of aluminium, i.e. secondary according to terminal oxygen content is bessemerized Aluminium block is added in rifle TSO value, and after aluminium block is added, Control for Oxygen Content is in 450ppm~550ppm in molten steel;
Steel ladle bottom argon blowing gas control system: tapping process ladle bottom blowing gas flow be 800NL/min, tapping the time control 5min~ 8min;
2. LF refining furnace smelting process
The processing of RH vacuum decarburization: after molten steel reaches RH furnace processing station, oxygen is determined in thermometric sampling, and temperature is greater than 1580 DEG C of progress vacuum Decarburization is added aluminum shot 1.5kg/ tons of molten steel at the end of reaction between carbon and oxygen and carries out deep deoxidation, continues vacuum and keeps 3min, according to steel grade Component requirements, are added ferrosilicon and metal manganese alloy carries out alloying;
RH Fruit storage: carrying out Fruit storage, vacuum degree≤85Pa after RH alloying, the retention time is greater than 20min, In RH whole process, ladle bottom blowing argon flow is controlled in 5NL/min~10NL/min, and vacuum terminates molten steel and is hung to the continuation of LF furnace Refining treatment;
The operation of the stokehold LF phase: after molten steel reaches processing station, ladle bottom blowing flow 300NL/min~400NL/min, power supply are adjusted 0.2kg/ tons of lime 2kg/ tons of steel, aluminium wire steel, sampling analysis, lower electrode heating are added after slugging 2min~3min;
LF furnace mid-term process control: according to first steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 3kg/ tons of steel, 0.2kg/ tons of steel of aluminium wire, sweetening process argon flow 200NL/min~300NL/ Min, feeding aluminum steel adjust molten steel aluminium content, feed aluminum steel and control argon flow 30NL/min~50NL/min, according to target steel grade Ingredient carry out alloying, heat up 6min~8min sampling analysis, lower electrode continue heat up desulfurization;
The control of LF furnace late stage: according to second steel sample ingredient of LF furnace and the sticky situation of slag condition, lime and aluminium wire slag making is added Desulfurization, lime adding amount are less than 1kg/ tons of steel, 0.3kg/ tons of steel of aluminium wire, white i.e. FeO+MnO≤1.0% of slag discoloration, liquid steel temperature liter Up to 1600 DEG C~1610 DEG C, electrode is promoted, covers refining furnace bell, steel ladle bottom argon blowing controlled atmosphere is whole to 800NL/min, carries out argon Gas agitating depth desulfurization 4min~5min, sampling analysis, based on the analysis results abundantization LF furnace mid-term process control flow;
Calcium treatment, that is, soft stirring: after molten steel composition temperature qualification, pure calcium line 1.6m/ tons of steel are fed in molten steel, Calcium treatment terminates Soft stirring is greater than 8min, soft stirring Bottom Blowing Flow Rate Control 20NL/min~30NL/min afterwards.
2. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the tapping is made Slag, pro-molten refining slag include: CaO:45.0%~55.0%, Al203: 27.0%~35.0%, SiO2≤6.0%、MgO≤8.0%、 Fe2O3≤1.5%、H2O≤0.5%。
3. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the tapping is stayed Oxygen, metal manganese alloy: 0.04%≤Mn≤0.60%.
4. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the tapping is stayed Aluminium block is not added as TSO oxygen content < 550ppm in oxygen;As 550ppm≤TSO oxygen content < 650ppm, aluminium block additional amount 30kg;When 650ppm≤TSO oxygen content < 750ppm, aluminium block additional amount 60kg;As 750ppm≤TSO oxygen content < 850ppm, aluminium block is added Measure 90kg;As TSO oxygen content > 850ppm, aluminium block additional amount 120kg.
5. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the tapping is stayed The time is added in oxygen, aluminium block are as follows: tapping starts → tap 30 seconds plus slag material → tapping to 1/3 plus aluminium block → Mn series alloy → tapping Terminate.
6. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the RH vacuum Carbonization treatment needs LF furnace to be warming up to 1620 DEG C or more and returns RH processing again when temperature≤1580 DEG C.
7. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the RH vacuum Carbonization treatment, as RH vacuum degree is reduced by normal atmosphere (An), molten steel decarburization starts, when vacuum degree be reduced to 500Pa with Interior, reaction between carbon and oxygen terminates, time 6min~9min.
8. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the RH vacuum The additional amount of carbonization treatment, ferrosilicon and manganese metal by steel grades lower limit with addition of.
9. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: in the LF furnace Phase process control, first steel sample handle time 10min;The LF furnace late stage control, second steel sample handle the time 25min。
10. a kind of high cleanliness acid-resistant pipeline steel smelting process according to claim 1, it is characterised in that: the LF furnace Mid-term process control, aluminum steel feed quantity are maintained at 0.035%~0.045% with aluminium content in smelting process to control.
CN201811329461.8A 2018-11-08 2018-11-08 A kind of high cleanliness acid-resistant pipeline steel smelting process CN109280732A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109880974A (en) * 2019-03-20 2019-06-14 首钢集团有限公司 A kind of RH method of refining reducing ultra-low-carbon steel tundish total oxygen content
CN110423947A (en) * 2019-09-02 2019-11-08 湖南华菱湘潭钢铁有限公司 A kind of smelting process of the low boron steel of low-sulfur
WO2020093710A1 (en) * 2018-11-08 2020-05-14 南京钢铁股份有限公司 High-purity acid-resistant pipeline steel smelting process

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