CN110055375A - A kind of Ultra-low carbon ultralow-sulfur steel smelting process - Google Patents
A kind of Ultra-low carbon ultralow-sulfur steel smelting process Download PDFInfo
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- CN110055375A CN110055375A CN201910331339.2A CN201910331339A CN110055375A CN 110055375 A CN110055375 A CN 110055375A CN 201910331339 A CN201910331339 A CN 201910331339A CN 110055375 A CN110055375 A CN 110055375A
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/10—Handling in a vacuum
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of Ultra-low carbon ultralow-sulfur steel smelting processes, it is related to iron and steel smelting technology field, including molten iron ladle pouring → molten iron pretreatment → converter smelting → RH furnace vacuum → LF furnace refining → continuous casting, wherein the refining of LF furnace includes that LF furnace control carbon, LF furnace depth desulfurization and LF furnace go to be mingled with.The present invention reduces carburetting of the steel grade in LF furnace smelting process, and the sulfur content in steady decrease molten steel, meet the performance requirement of antiacid pipeline, successfully develop a kind of smelting process of Ultra-low carbon ultralow-sulfur steel, C, S Composition Control is stablized, and non-metallic inclusion effectively controls, and Inner Quality of Billet is good, the control of steel plate inspection qualification rate fully meets production needs 99.5% or more.
Description
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of Ultra-low carbon ultralow-sulfur steel smelting process.
Background technique
Pipeline is that petroleum, natural gas be most economical, reasonable long-distance transportation mode, have efficiently, economic, safety etc.
Feature.Conveyance conduit forward direction heavy caliber, high pressure direction are developed at present, and pipe line steel it is also desirable to have while requiring high intensity
High low temperature arrest toughness and good welds.Since the 1970s, various countries' petroleum, natural gas exploit condition have occurred
Significant change, although natural gas has carried out purified treatment, H before transporting at present2The presence of S and water causes corrosive pipeline still
Unavoidably, there are also the pipe line steels of some particular oils, gas conveying area, and corrosion phenomenon can also occur.Hydrogen sulfide is acid inside pipeline
Corrosion is one of the principal mode of gas transmission line corrosion, and this corrosion failure mainly causes stress corrosion to open by hydrogen induced cracking, sulphur
Split with caused by three kinds of modes of electrochemical corrosion.To guarantee oil-gas transportation safety, pipe line steel is special to resistance to corrosion in recent years
Be not anti-hydrogen induced cracking (HIC) and sulphide stress corrosion (SCC) requirement it is higher and higher.Antiacid corroded pipeline steel is petroleum pipeline
Line maximum one kind of steel production difficulty, requires the control of Cleanliness of Molten Steel and continuous casting billet center segregation high, is controlling
It is controlled in terms of molten steel carbon, sulfur content close to the limit, so antiacid corroded pipeline steel production technology, the especially research and development of process for making
There is extremely important meaning.
With the rapid development of steel industry, steel for pipe pipe is increasingly stringenter the performance requirement of steel, does not require nothing more than tool
There are high-intensitive, high low temperature arrest toughness and good weldability, having anti-H is also required to the pipe line steel of Special section2S is acid rotten
Erosion ability.In order to improve steel resistance against hydrogen cracking and resisting sulfide stress corrosion cracking ability, it is necessary to as far as possible in reduction steel
Carbon, phosphorus, sulphur, oxygen, nitrogen, hydrogen impurity element content and control non-metallic inclusion quantity, form and size, improve molten steel
Degree of purity.LF furnace refining procedure is largely used in steel mill, country steel making working procedure at present, since LF furnace uses three graphite electrodes
To the characteristic of molten steel heating, cause in LF furnace smelting process, the carbon component in molten steel can by molten steel to electrode be washed away consumption and
Increase, forms contradiction with desulfurization so as to form the control carbon in molten steel.
Since this steel grade is extremely stringent to the carbon in molten steel, sulfur content requirement, major steel mill, the country is for antiacid pipe at present
The lumber recovery of line is all universal relatively low, if it is possible to which carbon, the sulphur component content of stability contorting steel grade improve becoming a useful person for antiacid pipeline
Rate will all replace biggish economic benefit in the security performance of the waste and petroleum transportation pipeline of sentencing waste product.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of Ultra-low carbon ultralow-sulfur steel smelting process, including molten iron falls
Tank → molten iron pretreatment → converter smelting → RH furnace vacuum → LF furnace refining → continuous casting, wherein the refining of LF furnace includes the control of LF furnace
Carbon, LF furnace depth desulfurization and LF furnace go to be mingled with,
LF furnace control carbon: the stokehold the LF phase is heated using short arc, controls 150~200NL/min of bottom blowing flow；According to slag after slag melting
Slag charge is continuously replenished in condition, adjusts basicity of slag, mobility and thickness of slag layer in time, it is ensured that 7~10, clinker flows basicity of slag
Property 50~80NL/min flow when the top of the slag wriggle, be not crusted, thickness of slag layer is between 10~15cm；Submerged arc uses big grade after stablizing
Number be rapidly heated, according to the outbound aluminium content of RH furnace to molten steel aluminium component carry out feed aluminum steel adjustment, when temperature rise to target temperature ±
At 10 DEG C, start plus aluminium wire carries out slag deoxidation to clinker, and is chosen according to rhythm of production and to continue warming temperature or to mention electrode big
Bottom blowing stirring desulfurization operations；
LF furnace depth desulfurization: the deep desulfurization operations of LF furnace are postponed when rising to target temperature ± 10 DEG C to temperature, are taken and are mentioned electrode, outsole
It blows and adds bypass operations, using CaO-Al2O3-SiO2Ternary basic slag system depth desulfurization, the control of process basicity is 6.0~8.0, ton steel
FeO and MnO content of the quantity of slag control in 12.5~15.5kg (slag charge containing converter tapping), slag less than 0.8%, protect by refining process
Hold micro-positive pressure, it is ensured that good reducing atmosphere in furnace；
LF furnace goes to be mingled with: carry out Calcium treatment after ingredient, temperature are qualified, Calcium treatment uses seamless pure calcium core-spun yarn, head furnace 250 ±
220 ± 10m of the road 10m, Lian Jiao, with the feeding of 200m/min speed；It is quiet after Calcium treatment to stir time requirement >=15min, soft stirring
Bottom blowing precise control of flew is in 30~50NL/min.
Technical effect: the present invention relates to converters, and oxygen to be stayed to tap, and using RH vacuum process nature decarburization, LF refining process is pushed away
On slow slag deoxidation opportunity, the carbon content of consumption of electrode is taken off using the residual oxygen in slag, reduce molten steel recarburization, using small bottom blowing, greatly
Electrode power is rapidly heated, and reduces wash away carburetting of the molten steel to electrode, and endpoint carbon content is effectively controlled within 0.003%；It is logical
It crosses molten iron to pre-process deep desulfurization and take off Slag treatment, be blown using the high-quality supplementary material such as the self-produced steel scrap of low-sulfur, converter tapping sulfur content
Within 0.009%, RH vacuum terminates to carry out pre-deoxidation to molten steel for control, controls within outbound Oxygen Content in Liquid Steel 20ppm；LF furnace
It is rapidly heated, refining process Bottom Argon Stirring technology controlling and process, white slag constantly adjust the modes such as holding, molten steel terminal sulphur control after being formed
System is within 0.0010%, to reach the requirement to steel grade carbon, sulphur ingredient.Reduce increasing of the steel grade in LF furnace smelting process
Carbon, and the sulfur content in steady decrease molten steel, meet the performance requirement of antiacid pipeline, successfully develop a kind of Ultra-low carbon super-low sulfur
The smelting process of steel, C, S Composition Control are stablized, and non-metallic inclusion effectively controls, and Inner Quality of Billet is good, steel plate inspection
Qualification rate control fully meets production needs 99.5% or more.
The technical solution that the present invention further limits is:
A kind of preceding Ultra-low carbon ultralow-sulfur steel smelting process, molten iron pretreatment: ladle blowing process is selected in molten iron pretreatment
Desulfurization auxiliary springs up the poly- slag device for removing slag of formula, guarantees into furnace Sulfur Content in Hot Iron content less than 0.0030%, and sulfur content is returned after bessemerizing
Less than 0.0020%.
Converter smelting: a kind of preceding Ultra-low carbon ultralow-sulfur steel smelting process the molten iron after desulfurization is answered using top bottom
Blow converter is smelted, and initial smelting period rationally controls rifle position, is accomplished early slugging, has been changed slag, as early as possible formed high alkalinity, high FeO and
The initial stage slag of good fluidity reinforces bottom blowing stirring, strengthens dephosphorization early period；Middle and later periods strict control decarbonization rate, avoids clinker from returning
It is dry and heat up and too fast, excessively high lead to rephosphorization；Bessemerize 50~65kg/t of process slag material lime, light dolomite 15~
25kg/t, basicity of slag are controlled 3.5~4.0；Endpoint molten steel carbon content is controlled 0.03%~0.05%, and oxygen content is 600
~900ppm, tapping temperature are controlled at >=1660 DEG C, it is ensured that are not less than 1580 DEG C to RH furnace temperature；It is grasped when tapping using pushing off the slag
Make, the control tapping time is no less than 3.5min, and slag thickness is no more than 50mm, to prevent rephosphorization；According to aim carbon and oxygen content, tapping is adopted
With weak deoxidation, oxygen is stayed to tap, controls 500~600ppm of oxygen content in ladle molten steel.
A kind of preceding Ultra-low carbon ultralow-sulfur steel smelting process, RH furnace vacuum: using being reserved in molten steel after converter tapping
Oxygen content reduces the CO partial pressure of [C]+[O]=[CO] reaction by vacuumizing, and keeps in 80~100mbar of vacuum pressure
2min；Gently rear vacuum degree control is within 5mbar for reaction between carbon and oxygen, using big 1200~1400L/min of recycle stream flow
Vacuum cycle is carried out, 3~5min of decarburization time, molten steel endpoint carbon content requires control≤0.010% after natural decarburization；Decarburization
After to molten steel carry out deoxidation alloying, control steel in Alt:0.030%~0.060%, steel water oxygen is in 20ppm after deoxidation
Within, vacuum retention time >=15min after alloying.
A kind of preceding Ultra-low carbon ultralow-sulfur steel smelting process, continuous casting: ladle nozzle is cleaned out, and reinforces drainage
The filling sand of sand operates；Big packet, which is opened, pours packet beginning blowing argon gas in preceding 5min, until covering agent addition terminates in the first round；From big
It wraps middle packet to connect using long nozzle, is passed through argon gas positive pressure protection molten steel；Middle packet plus carbon-free covering agent, middle packet submersed nozzle,
Crystallizer adds pipe line steel mould flux means, accomplishes that whole process protection is poured；Continuous casting working procedure nitrogen pick-up controls within 5ppm.
A kind of preceding Ultra-low carbon ultralow-sulfur steel smelting process, the control of the degree of superheat and pulling rate: degree of superheat control 10~
25 DEG C, 10~20 DEG C of target, the casting of low overheat perseverance pulling rate；Control the insertion depth at the mouth of a river, stringent mold gap centering.
The beneficial effects of the present invention are:
(1) present invention completes the determination of oxygen content optimum value when 150T converter stays oxygen to tap, and avoids too high oxygen level, LF furnace
When desulfurization pressure is big and oxygen content is too low, the residual oxygen in clinker cannot be made full use of to react with the carbon of consumption of electrode, caused
The direct carburetting serious situation of molten steel occurs, and stabilizes the Composition Control of molten steel；
(2) when the present invention completes aluminum deoxidation after RH furnace decarburization, the determination of aluminium block additional amount optimum value avoids aluminium block addition
Excessively, the aluminium component in molten steel is excessively high, directly reacts with the oxygen in clinker, reduces the residual oxygen in clinker, does not have LF furnace benefit
The purpose of electrode carburetting being consumed with residual oxygen and aluminium block being added very few, deoxidation of molten steel is incomplete, and LF furnace desulfurization pressure is big
Situation stabilizes the Composition Control of molten steel；
(3) slag deoxidation opportunity is postponed to liquid steel temperature by postponing slag deoxidation opportunity and reaches target temperature by LF furnace in the present invention
It is carried out at ± 10 DEG C, consumes carbon consumed by graphite electrode in temperature-rise period using the residual oxygen in clinker well, make this
A little carbon do not enter back into molten steel, but react with the residual oxygen in clinker and generate the discharge of CO bubble, are also beneficial to the formation of foamed slag,
Improve heating efficiency；
(4) LF furnace reduces desulfuration efficiency by the dynamic conditions of sacrifice early period to guarantee the carburetting of reduction molten steel in the present invention
Amount, using the high temperature in later period, big bottom blowing stirring and good slag fluidity etc. because usually making up, completes deep desulfurization well
With the balance of control carbon, make the two no longer contradiction.
Specific embodiment
Embodiment 1
A kind of Ultra-low carbon ultralow-sulfur steel smelting process provided in this embodiment, including molten iron ladle pouring → molten iron pretreatment → converter smelting
Refining → RH furnace vacuum → LF furnace refining → continuous casting, specifically:
1, molten iron pre-processes
For control converter terminal sulfur content, the excessively high influence field trash absorption of LF basicity of slag is avoided, it is blast-melted first through molten iron
Pretreatment carries out desulfurization.Molten iron pretreatment selects ladle Desulfurization by injecting method auxiliary to spring up the poly- slag device for removing slag of formula, desulfurizing iron
Temperature drop is small, skims clean, desulfurization degree guarantees to bessemerize into furnace Sulfur Content in Hot Iron content less than 0.0030% up to 85% or more
After return sulfur content less than 0.0020%.
2, converter smelting
Molten iron after desulfurization is smelted using top and bottom combined blown converter, initial smelting period rationally controls rifle position, accomplishes early slugging, change
Good slag forms the initial stage slag of high alkalinity, high FeO and good fluidity as early as possible, reinforces bottom blowing stirring, strengthens dephosphorization early period；Middle and later periods
Strict control decarbonization rate avoids slag getting dry and heats up too fast, excessively high to lead to rephosphorization；Bessemerize process slag material lime 50
~65kg/t, 15~25kg/t of light dolomite, basicity of slag are controlled 3.5~4.0；The control of endpoint molten steel carbon content exists
0.03%~0.05%, oxygen content is controlled in 600~900ppm, tapping temperature at >=1660 DEG C, it is ensured that not low to RH furnace temperature
In 1580 DEG C；It is operated when tapping using pushing off the slag, the control tapping time is no less than 3.5min, and slag thickness is no more than 50mm, to prevent rephosphorization；
According to aim carbon and oxygen content, tapping uses weak deoxidation, oxygen is stayed to tap, and controls 500~600ppm of oxygen content in ladle molten steel.
3, RH furnace vacuum
Using oxygen content is reserved in molten steel after converter tapping, the CO gas point of [C]+[O]=[CO] reaction is reduced by vacuumizing
Pressure keeps 2min in 80~100mbar of vacuum pressure；Gently rear vacuum degree control is within 5mbar for reaction between carbon and oxygen, using big
1200~1400L/min of recycle stream flow carries out vacuum cycle, 3~5min of decarburization time, molten steel aim carbon after natural decarburization
Content requirement is controlled≤0.010%；After decarburization to molten steel carry out deoxidation alloying, control steel in Alt:0.030%~
0.060%, steel water oxygen is within 20ppm after deoxidation, vacuum retention time >=15min after alloying, it is ensured that alloy at
Divide uniform degasifying effect.
4, LF furnace refines
LF furnace smelting process needs to control molten steel recarburization and deep desulfurization, it is qualified to guarantee molten steel composition, while needed again to molten steel liter
Temperature guarantees that liquid steel temperature has castability, and due to the characteristic that LF furnace uses three graphite electrodes to heat up, temperature-rise period must be had
Graphite electrode, which is washed off by steel, causes molten steel recarburization phenomenon, how to reduce what the carburetting of smelting process graphite electrode was smelted at LF furnace
It is crucial.
4.1, LF furnace control carbon
Since molten steel arrives at a station, initial temperature is lower, and slag fluidity is poor, thickness of slag layer is inadequate, and the stokehold the LF phase is added using short arc
Heat controls 150~200NL/min of bottom blowing flow, and submerged arc early period is avoided bad to lead to molten steel recarburization, nitrogen pick-up；Root after slag melting
Slag charge is continuously replenished according to slag condition, adjusts clinker in time and adjusts basicity of slag, mobility and thickness of slag layer in time, it is ensured that basicity of slag
At 7~10, slag fluidity 50~80NL/min flow, the top of the slag is wriggled, is not crusted, and thickness of slag layer is between 10~15cm, really
It is good to protect submerged arc effect, prevents molten steel from washing away electrode；Submerged arc is rapidly heated after stablizing using big series, at this time (feeds original technique
On aluminum steel and the top of the slag plus the mode of aluminium wire carries out precipitating and diffusive deoxidation to molten steel) it is changed to according to the outbound aluminium content of RH furnace to molten steel
Aluminium component carries out feeding aluminum steel adjustment, postpone slag deoxidation opportunity (due to aluminium block being added after RH furnace vacuum process decarburization to deoxidation of molten steel,
Outbound aluminium component are as follows: 0.030%~0.060%, show that the oxygen content in molten steel is very low, postpone slag deoxidation opportunity be in order to
It is reacted using the residual oxygen in clinker with carbon caused by consumption of electrode, production CO gas discharge can't pollute steel
Water, to reduce molten steel recarburization), when temperature rises to target temperature ± 10 DEG C, starts plus aluminium wire carries out slag deoxidation to clinker, and
It is chosen according to rhythm of production and continues warming temperature or propose the big bottom blowing stirring desulphurization of electrode to operate.
4.2, LF furnace depth desulfurization
Since molten steel arrives at a station, initial temperature is lower, and slag fluidity is poor, thickness of slag layer is inadequate, and the higher (RH of FeO content in slag
Furnace is not to clinker deoxidation), desulfuration efficiency is lower at this time, and big bottom blowing and the heating desulfurization of lower electrode is blindly taken easily molten steel to be caused to rush
Brush electrode, carburetting is serious, and the deep desulfurization operations of LF furnace are postponed when rising to target temperature ± 10 DEG C to temperature, takes and mentions electrode, greatly
Bottom blowing adds bypass operations, using CaO-Al2O3-SiO2Ternary basic slag system depth desulfurization, the control of process basicity is 6.0~8.0, ton
FeO and MnO content of the steel slag amount control in 12.5~15.5kg (slag charge containing converter tapping), slag is less than 0.8%, refining process
Keep micro-positive pressure, it is ensured that good reducing atmosphere in furnace.
4.3, LF furnace goes to be mingled with
Calcium treatment is carried out after ingredient, temperature are qualified, Calcium treatment uses seamless pure calcium core-spun yarn, the road head furnace 250 ± 10m, Lian Jiao
220 ± 10m, with the feeding of 200m/min speed, it is ensured that calcium line is uniform in the reaction of ladle middle and lower part, becomes inclusion content in melting steel sufficiently
Property, while reducing calcium line secondary oxidation of steel caused by molten steel surface vigorous reaction, it is ensured that sulphide inculsion is all denaturalized；Calcium
After treatment is quiet to stir time requirement >=15min, and soft stirring bottom blowing precise control of flew fills field trash in 30~50NL/min
Point aggregation, float.
5, continuous casting
Ladle nozzle is cleaned out, and reinforces the filling sand operation of stuffing sand, it is ensured that steel ladle self-flow avoids continuous casting from opening and pours burning oxygen, pollution
Molten steel；Big packet, which is opened, pours packet beginning blowing argon gas in preceding 5min, until covering agent addition terminates in the first round；From big packet to middle packet
It is connected using long nozzle, is passed through argon gas positive pressure protection molten steel；Middle packet plus carbon-free covering agent, middle packet submersed nozzle, crystallizer add
Pipe line steel mould flux means accomplish that whole process protection is poured；Continuous casting working procedure nitrogen pick-up controls within 5ppm.
The control of the degree of superheat and pulling rate: the degree of superheat controls 10~25 DEG C, and 10~20 DEG C of target, low overheat perseverance pulling rate pours
Note；The insertion depth at the mouth of a river is controlled, stringent mold gap centering avoids causing steel because crystallizer liquid level fluctuation of molten steel is big
Water slag.
The present invention pre-processes deep desulphurization and slag skimming by molten iron, and converter treatment process deep dephosphorization stays oxygen (600~900ppm) to go out
Steel, the modification of composite refining slag top slag, RH vacuum process nature decarburization, LF refining process postpones slag deoxidation opportunity, using in slag
Residual oxygen takes off the carbon content of consumption of electrode, reduces molten steel recarburization, is rapidly heated using small bottom blowing, large electrode power, reduces steel
Wash away carburetting of the water to electrode, endpoint carbon content are effectively controlled within 0.003%；Temperature properly utilizes high temperature, big bottom blowing afterwards
Deep desulfurization is stirred, the inclusion modification in molten steel is made by Calcium treatment, by soft blow by the inclusion floating of denaturation and by clinker
Absorption while guaranteeing that carbon, sulphur ingredient meet performance, reduces harmful element in molten steel, improves the purpose of Molten Steel Cleanliness.
Embodiment 2-3
X65MS-2 steel grade is selected, is smelted in 150 tons of converters, 150 tons of ladle furnaces, X65MS-2 steel grade main chemical compositions are shown in Table
1:
1 X65MS-2 main chemical (%) of table
Specific smelting process is as follows:
(1) it bessemerizes, blowing end point ingredient and temperature control are shown in Table 2:
2 converter terminal ingredient (%) of table
(2) RH vacuum drying oven, vacuum decarburization → deoxidation → alloying, outbound Composition Control are shown in Table 3:
The outbound ingredient of table 3RH
(3) LF refining furnace, the high-power heating of the slugging → slag making submerged arc → small bottom blowing → big bottom blowing depth desulfurization of slag deoxidation → high temperature →
Calcium treatment → soft blow, outbound Composition Control are shown in Table 4:
4 refining furnace endpoint molten steel main ingredient (%) of table
(4) continuous casting billet quality, continuous casting billet control of deleterious element are lower: [P]≤90ppm, [S]≤10ppm, T [O]≤9ppm, [N]
≤ 40ppm, [H]≤1.5ppm, low multiple quality are preferable.
The present invention passes through desulfurizing iron pretreatment → converter smelting → RH vacuum decarburization processing → LF refining → sheet billet continuous casting
Production procedure, each process are fitted close, and realize Ultra-low carbon low-sulfur steel batch, stable production.It can be by molten steel using the technique
Composition Control exists: [C]≤0.03%；[P]≤0.013%；[S]≤0.0010%；[N]≤0.0050% reaches reduction molten steel
Middle harmful element improves the purpose of Molten Steel Cleanliness, is able to satisfy the requirement of scene large-scale production.
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 (6)
1. a kind of Ultra-low carbon ultralow-sulfur steel smelting process, including molten iron ladle pouring → molten iron pretreatment → converter smelting → RH furnace vacuum
→ LF furnace refining → continuous casting, it is characterised in that: wherein the refining of LF furnace includes that LF furnace control carbon, LF furnace depth desulfurization and LF furnace go to press from both sides
It is miscellaneous,
LF furnace control carbon: the stokehold the LF phase is heated using short arc, controls 150~200NL/min of bottom blowing flow；According to slag after slag melting
Slag charge is continuously replenished in condition, adjusts basicity of slag, mobility and thickness of slag layer in time, it is ensured that 7~10, clinker flows basicity of slag
Property 50~80NL/min flow when the top of the slag wriggle, be not crusted, thickness of slag layer is between 10~15cm；Submerged arc uses big grade after stablizing
Number be rapidly heated, according to the outbound aluminium content of RH furnace to molten steel aluminium component carry out feed aluminum steel adjustment, when temperature rise to target temperature ±
At 10 DEG C, start plus aluminium wire carries out slag deoxidation to clinker, and is chosen according to rhythm of production and to continue warming temperature or to mention electrode big
Bottom blowing stirring desulfurization operations；
LF furnace depth desulfurization: the deep desulfurization operations of LF furnace are postponed when rising to target temperature ± 10 DEG C to temperature, are taken and are mentioned electrode, outsole
It blows and adds bypass operations, using CaO-Al2O3-SiO2Ternary basic slag system depth desulfurization, the control of process basicity is 6.0~8.0, ton steel
The quantity of slag is controlled in 12.5~15.5kg(slag charge containing converter tapping), FeO the and MnO content in slag is less than 0.8%, refining process guarantor
Hold micro-positive pressure, it is ensured that good reducing atmosphere in furnace；
LF furnace goes to be mingled with: carry out Calcium treatment after ingredient, temperature are qualified, Calcium treatment uses seamless pure calcium core-spun yarn, head furnace 250 ±
220 ± 10m of the road 10m, Lian Jiao, with the feeding of 200m/min speed；It is quiet after Calcium treatment to stir time requirement >=15min, soft stirring
Bottom blowing precise control of flew is in 30~50NL/min.
2. a kind of Ultra-low carbon ultralow-sulfur steel smelting process according to claim 1, it is characterised in that: the molten iron is located in advance
Reason: molten iron pretreatment selects ladle Desulfurization by injecting method auxiliary to spring up the poly- slag device for removing slag of formula, guarantees into furnace Sulfur Content in Hot Iron content
Sulfur content is returned less than 0.0030%, after bessemerizing less than 0.0020%.
3. a kind of Ultra-low carbon ultralow-sulfur steel smelting process according to claim 2, it is characterised in that: the converter smelting:
Molten iron after desulfurization is smelted using top and bottom combined blown converter, initial smelting period rationally controls rifle position, accomplishes early slugging, changes
Slag forms the initial stage slag of high alkalinity, high FeO and good fluidity as early as possible, reinforces bottom blowing stirring, strengthens dephosphorization early period；Middle and later periods is tight
Lattice control decarbonization rate, avoid slag getting dry and heat up too fast, excessively high to lead to rephosphorization；Bessemerize process slag material lime 50~
65kg/t, 15~25kg/t of light dolomite, basicity of slag are controlled 3.5~4.0；Endpoint molten steel carbon content is controlled 0.03%
~0.05%, oxygen content is controlled in 600~900ppm, tapping temperature at >=1660 DEG C, it is ensured that is not less than 1580 to RH furnace temperature
℃；It is operated when tapping using pushing off the slag, the control tapping time is no less than 3.5min, and slag thickness is no more than 50mm, to prevent rephosphorization；According to end
Point carbon and oxygen content, tapping use weak deoxidation, oxygen are stayed to tap, and control 500~600ppm of oxygen content in ladle molten steel.
4. a kind of Ultra-low carbon ultralow-sulfur steel smelting process according to claim 3, it is characterised in that: the RH furnace vacuum:
Using oxygen content is reserved in molten steel after converter tapping, the CO partial pressure of [C]+[O]=[CO] reaction is reduced by vacuumizing,
80~100mbar of vacuum pressure keeps 2min；Gently rear vacuum degree control is within 5mbar for reaction between carbon and oxygen, using big circulation
1200~1400L/min of gas flow carries out vacuum cycle, 3~5min of decarburization time, molten steel endpoint carbon content after natural decarburization
It is required that control is ≤0.010%；Deoxidation alloying is carried out to molten steel after decarburization, controls Alt:0.030%~0.060% in steel,
Steel water oxygen is within 20ppm after deoxidation, vacuum retention time >=15min after alloying.
5. a kind of Ultra-low carbon ultralow-sulfur steel smelting process according to claim 4, it is characterised in that: the continuous casting:
Ladle nozzle is cleaned out, and the filling sand operation of stuffing sand is reinforced；Big packet, which is opened, pours packet beginning blowing argon gas in preceding 5min, until first
Covering agent addition terminates in wheel；It is connected from big packet to middle packet using long nozzle, is passed through argon gas positive pressure protection molten steel；Middle Bao Jiawu
Carbon coverture, middle packet submersed nozzle, crystallizer add pipe line steel mould flux means, accomplish that whole process protection is poured；Continuous casting work
Sequence nitrogen pick-up controls within 5ppm.
6. a kind of Ultra-low carbon ultralow-sulfur steel smelting process according to claim 5, it is characterised in that: the degree of superheat and pulling rate
Control: the degree of superheat controls 10~25 DEG C, and 10~20 DEG C of target, low overheat perseverance pulling rate is poured；The insertion depth at the mouth of a river is controlled,
Stringent mold gap centering.
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| PCT/CN2019/117757 WO2020215688A1 (en) | 2019-04-23 | 2019-11-13 | Process for smelting ultra-low-carbon and ultra-low-sulfur steel |
| KR1020217036064A KR20210143319A (en) | 2019-04-23 | 2019-11-13 | Ultra-low carbon ultra-low flow steel smelting process |
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|---|---|
| WO2020215688A1 (en) | 2020-10-29 |
| KR20210143319A (en) | 2021-11-26 |
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Application publication date: 20190726 |