CN109055649A - A kind of high manganese high-silicon high ferrophosphorus water of converter smelting proposes the preparation method of carbon guarantor's manganese - Google Patents
A kind of high manganese high-silicon high ferrophosphorus water of converter smelting proposes the preparation method of carbon guarantor's manganese Download PDFInfo
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- CN109055649A CN109055649A CN201811154699.1A CN201811154699A CN109055649A CN 109055649 A CN109055649 A CN 109055649A CN 201811154699 A CN201811154699 A CN 201811154699A CN 109055649 A CN109055649 A CN 109055649A
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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
- 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
- C21C7/068—Decarburising
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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 invention discloses a kind of high manganese high-silicon high ferrophosphorus water (Mn1.10-1.50wt% of converter smelting, Si 0.70-1.00 wt%, P 0.120-0.170wt%, S≤0.035wt%) propose the preparation method that carbon protects manganese, this method is by taking remaining slag operation, double slag slagging process, less-slag melting, smelting process constant pressure becomes rifle operation, the minimum rifle position of converter one presses rifle operation, techniques and the integrated innovation such as tapping process wash heat and whole BOTTOM ARGON BLOWING, it optimizes and smelts kinetics and thermodynamic condition, obtain good smelting dephosphorization, desulfurization effect, avoid smelting process molten steel and clinker splash, (MnO) distribution concentration is effectively increased in slag, promote the reduction for smelting (MnO) in mid-term slag, it reduces and smelts M in later period molten steel The re-oxidation of n significantly improves the residual Mn content (0.35-0.55wt%) of endpoint molten steel, reduces Mn series alloy additional amount during deoxidation alloying, significantly reduces steel-smelting alloy consumption and alloying cost, improves product competitiveness in the market.
Description
Technical field
The invention belongs to Ferrous Metallurgy process for making technical fields, and in particular to a kind of high manganese high-silicon high phosphorus for mentioning carbon and protecting manganese
Molten iron converter smelting method.
Background technique
Manganese (Mn) element is the beneficial element in steel, with the continuous progress of converting process, iron in converter steelmaking process
The exhausted major part of Mn in water is oxidized, and the residual Mn content of smelting endpoint molten steel is lower, cause deoxidation alloying Mn system's cost of alloy compared with
It is high.Mn of the Mn content of converter smelting endpoint molten steel in molten iron, in converting process, in metal bath, slag and oxygen
The oxidation and reduction reaction of manganese occur between gas, residual Mn content of the final residue in converter terminal molten steel is whole by the quantity of slag, converter
The influence of the point factors such as molten steel and slag beneficiation, converter terminal temperature.By Optimization of LD Smelting Technology, converter terminal is improved
The residual Mn content of molten steel, it is possible to reduce the consumption of deoxidation alloying Mn series alloy after furnace advantageously reduces STEELMAKING PRODUCTION cost, improves
The steel product market competitiveness.
Steel mill of country converter smelting mostly uses greatly Mn content≤0.50wt% molten iron smelting at present, due to molten iron Mn content
It is lower along in smelting process slag MnO reduction effect it is bad, cause the residual Mn of smelting endpoint molten steel it is lower (content≤
0.12wt%), Mn series alloy additional amount is more during deoxidation alloying, alloy consumption and alloying higher cost.In recent years,
Domestic minority steel mill has carried out the research of technique work for improving molten iron Mn content, by sintering process with addition of the high expensive sand of manganese at high proportion
The molten iron of following chemical components: Mn 1.10-1.50wt%, Si 0.70-1.00wt%, P 0.120- is provided in mine, production
0.170wt%, S≤0.035wt%, converter smelting use above-mentioned high manganese high-silicon high phosphorus molten iron smelting, how to reduce smelting process spray
It splashes, utmostly improves the residual Mn content of endpoint molten steel, and then reduce Mn series alloy additional amount during deoxidation alloying, reduce refining
Steel production cost is just particularly important and urgently.Steel mill of country converter smelting is substantially all using with following chemical components at present
Low Mn, the low P molten iron smelting of (Mn≤0.50wt%, Si 0.30-0.50wt%, P≤0.100wt%), to above-mentioned hot metal composition
Converter smelting process has certain research report, but does not have to carbon guarantor's manganese smelting process is mentioned using high manganese high-silicon high ferrophosphorus water converter
Correlative study report.In view of the above problems, proposing the system that carbon protects manganese it is necessary to invent a kind of high manganese high-silicon high ferrophosphorus water of converter smelting
Preparation Method.
Summary of the invention
The purpose of the present invention is to provide a kind of high manganese high-silicon high ferrophosphorus water of converter smelting to propose the preparation method that carbon protects manganese.
The object of the present invention is achieved like this, comprises the following steps that:
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 130-150kg/tSteelIt is useless
Steel is packed into proportion, and steel scrap is added in 50 tons of LD converters；By 920-940kg/tSteelMolten iron be packed into proportion, be added in 50 tons of LD converters
The high manganese high-silicon high ferrophosphorus water of following temperature and mass ratio: molten iron temperature >=1290 DEG C, hot metal composition C 4.5-5.2wt%, Si
0.70-1.00wt%, Mn 1.10-1.50wt%, P 0.120-0.170wt%, S≤0.035wt%, remaining is for Fe and unavoidably
Impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.80~0.90MPa, opens and is blown to 20 seconds, oxygen lance position is controlled by 1.4-1.5m
System, oxygen presses 0.85MPa control, by 7.2-9.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen
Rifle rifle position is down to 0.9m, and oxygen presses 0.85MPa control, presses 10.9-13.5kg/t respectivelySteel、9.2-12.5kg/tSteel、3.5kg/tSteel
Amount, regular activated lime, light dolomite, magnesite ball slag making is added, by 0.9-1.7kg/tSteelAmount, be added slagging agent promote
Slugging；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 0.5-1.0 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter；
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues the blowing of lower oxygen rifle and goes forward side by side
The secondary slag making of row, blew to 380-420 seconds, and control of lance position 1.1m, oxygen presses 0.85MPa control, pressed 9.0- respectively
12.0kg/tSteel、9.0-11.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, presses
0.8-1.5kg/tSteelAmount, be added slagging agent carry out slugging；To 420-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle rifle for blowing
Position control is 1.2m；To 750-850 seconds, oxygen pressed 0.85MPa control for blowing, and control of lance position 1.0m blew to 850 seconds
When pressure rifle position to oxygen lance position be that 0.8m blows deeply and carries out within 30 seconds fall furnace sampling, 1610~1630 DEG C of the liquid steel temperature of falling furnace of control；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 880 seconds-terminal after the sampling of falling furnace of step C molten steel
Tapping stage, oxygen press 0.85-0.90MPa control, and oxygen lance position is controlled by 0.8-0.9m, control terminal tapping liquid steel temperature
1640~1660 DEG C；
E, converter tapping technique: active lime wash heat, lime adding amount 3.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 20~25NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
Compared with prior art, beneficial effects of the present invention:
1, the high manganese high-silicon high ferrophosphorus water of converter smelting provided by the invention (Mn1.10-1.50wt%, Si 0.70-1.00 wt%, P
0.120-0.170wt%, S≤0.035wt%) mention carbon protect manganese preparation method, by take remaining slag operation, double slag slagging process,
Less-slag melting, smelting process constant pressure become rifle operation, the operation of the minimum rifle position of converter one pressure rifle, tapping process wash heat and whole bottom blowing
The techniques such as argon and integrated innovation optimize and smelt kinetics and thermodynamic condition, obtain good smelting dephosphorization,
Desulfurization effect avoids smelting process molten steel and clinker splash, effectively increases in slag (MnO) distribution concentration, promotes smelting
The reduction of (MnO) in mid-term slag reduces the re-oxidation for smelting Mn in later period molten steel, significantly improves the residual Mn of endpoint molten steel and contain
It measures (0.35-0.55wt%).
2, invention significantly improves the residual Mn contents of endpoint molten steel, and Mn series alloy is added during reducing deoxidation alloying
Amount significantly reduces steel-smelting alloy consumption and alloying cost, promotes the improvement of smelting technique economic indicator, improve product
The market competitiveness.
3, the present invention is by being packed into technique, oxygen supply technique, slagging process, temperature process, terminal point control work to converter smelting
Skill and tapping wash heat and whole BOTTOM ARGON BLOWING integrated innovation, obtain good smelting dephosphorization, desulfurization effect, are greatly reduced
Smelting process splash realizes the high manganese high-silicon high ferrophosphorus water of converter smelting and mentions carbon and protects manganese, endpoint molten steel C content >=0.10wt%, residual
Mn content 0.35-0.55wt%.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but the present invention is limited in any way,
Based on present invention teach that it is made it is any transform or replace, all belong to the scope of protection of the present invention.
The high manganese high-silicon high ferrophosphorus water of converter smelting of the present invention proposes the preparation method that carbon protects manganese, including following technique step
It is rapid:
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 130-150kg/tSteelIt is useless
Steel is packed into proportion, and steel scrap is added in 50 tons of LD converters；By 920-940kg/tSteelMolten iron be packed into proportion, be added in 50 tons of LD converters
The high manganese high-silicon high ferrophosphorus water of following temperature and mass ratio: molten iron temperature >=1290 DEG C, hot metal composition C 4.5-5.2wt%, Si
0.70-1.00wt%, Mn 1.10-1.50wt%, P 0.120-0.170wt%, S≤0.035wt%, remaining is for Fe and unavoidably
Impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.80~0.90MPa, opens and is blown to 20 seconds, oxygen lance position is controlled by 1.4-1.5m
System, oxygen presses 0.85MPa control, by 7.2-9.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen
Rifle rifle position is down to 0.9m, and oxygen presses 0.85MPa control, presses 10.9-13.5kg/t respectivelySteel、9.2-12.5kg/tSteel、3.5kg/tSteel
Amount, regular activated lime, light dolomite, magnesite ball slag making is added, by 0.9-1.7kg/tSteelAmount, be added slagging agent promote
Slugging；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 0.5-1.0 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter；
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues the blowing of lower oxygen rifle and goes forward side by side
The secondary slag making of row, blew to 380-420 seconds, and control of lance position 1.1m, oxygen presses 0.85MPa control, pressed 9.0- respectively
12.0kg/tSteel、9.0-11.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, presses
0.8-1.5kg/tSteelAmount, be added slagging agent carry out slugging；To 420-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle rifle for blowing
Position control is 1.2m；To 750-850 seconds, oxygen pressed 0.85MPa control for blowing, and control of lance position 1.0m blew to 850 seconds
When pressure rifle position to oxygen lance position be that 0.8m blows deeply and carries out within 30 seconds fall furnace sampling, 1610~1630 DEG C of the liquid steel temperature of falling furnace of control；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 880 seconds-terminal after the sampling of falling furnace of step C molten steel
Tapping stage, oxygen press 0.85-0.90MPa control, and oxygen lance position is controlled by 0.8-0.9m, control terminal tapping liquid steel temperature
1640~1660 DEG C；
E, converter tapping technique: active lime wash heat, lime adding amount 3.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 20~25NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
Steel scrap described in step A includes the ingredient of following mass ratio: C 0.17-0.22wt%, Si 0.40-0.60wt%,
Mn 1.25-1.46wt%, P 0.036-0.050wt%, S0.035-0.048wt%, remaining is Fe and inevitable impurity；
The slagging agent includes the ingredient of following mass ratio: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3
29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity.
It is specially the pre-slag for pouring out 1/3-2/3 that part pre-slag is poured out described in step B.
The component requirements of the molten steel of falling furnace described in step C be C 0.15-0.25wt%, Mn 0.40-0.65wt%, P≤
0.030wt%、S≤0.025wt%。
The component requirements of the tapping molten steel of terminal described in step D are C 0.10-0.18wt%, P≤0.025wt%, Mn
0.35-0.55wt%、S≤0.025wt%。
Mentioned described in step E carbon protect manganese smelting molten steel have following weight percents ingredient: C 0.10~
0.18wt%, P≤0.025wt%, Mn0.35-0.55wt%, S≤0.022wt%, remaining is Fe and inevitable impurity.
Embodiment 1
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 130kg/tSteelSteel scrap dress
Enter proportion, the steel scrap of following mass ratio: C 0.17wt%, Si 0.40wt%, Mn 1.25wt%, P is added in 50 tons of LD converters
0.036wt%, S0.035wt%, remaining is Fe and inevitable impurity；By 940kg/tSteelMolten iron be packed into proportion, at 50 tons
The high manganese high-silicon high ferrophosphorus water of LD converter addition following temperature and mass ratio: 1290 DEG C of molten iron temperature, hot metal composition C
4.5wt%, Si 0.70wt%, Mn 1.10wt%, P 0.120wt%, S 0.020wt%, remaining for Fe and inevitably it is impure
Object.
B, it smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.80~0.85MPa, opens and is blown to 20 seconds, and oxygen lance position is by 1.4m control
System, oxygen presses 0.85MPa control, by 7.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen rifle rifle
For potential drop to 0.9m, oxygen presses 0.85MPa control, presses 10.9kg/t respectivelySteel、9.2kg/tSteel、3.5kg/tSteelAmount, be added conventional living
Property lime, light dolomite, magnesite ball slag making, by 0.9kg/tSteelAmount, be added following mass ratio slagging agent promote slugging:
CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is for Fe and unavoidably
Impurity；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 0.5 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter.
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues lower oxygen rifle blowing
And secondary slag making is carried out, it blows to 380-420 seconds, control of lance position 1.1m, oxygen presses 0.85MPa control, presses respectively
9.0kg/tSteel、9.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, by 0.8kg/
tSteelAmount, be added following mass ratio slagging agent carry out slugging: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3
29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；To 420-750 seconds, oxygen was pressed for blowing
0.85MPa control, control of lance position 1.2m；To 750-850 seconds, control of lance position 1.0m, oxygen was pressed for blowing
0.85MPa control, pressure rifle position (oxygen lance position 0.8m) is blown deeply when blowing was to 850 seconds carries out fall furnace sampling for 30 seconds, control furnace
1610 DEG C of liquid steel temperature, C 0.15wt%, Mn 0.40wt%, P 0.020wt%, S 0.020wt%.
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 880 seconds-
Terminal is tapped the stage, and oxygen presses 0.85-0.90MPa control, and oxygen lance position is controlled by 0.8m, and terminal tapping molten steel control requires:
1640 DEG C of temperature, C 0.10wt%, P 0.017wt%, Mn 0.35wt%, S 0.018wt%.
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
3.0kg/tSteel；Tapping process is 20NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.10wt%, P 0.017wt%, Mn0.35wt%, S0.015wt%, remaining is for Fe and unavoidably
Impurity.
Embodiment 2
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 140kg/tSteelSteel scrap dress
Enter proportion, the steel scrap of following mass ratio: C 0.20wt%, Si 0.50wt%, Mn 1.38wt%, P is added in 50 tons of LD converters
0.042wt%, S 0.040wt%, remaining is Fe and inevitable impurity；By 930kg/tSteelMolten iron be packed into proportion, 50
The high manganese high-silicon high ferrophosphorus water of ton LD converter addition following temperature and mass ratio: 1300 DEG C of molten iron temperature, hot metal composition
C4.9wt%, Si 0.85wt%, Mn 1.30wt%, P 0.145wt%, S0.030wt%, remaining for Fe and inevitably it is impure
Object.
B, it smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.80~0.90MPa, opens and is blown to 20 seconds, and oxygen lance position is by 1.5m control
System, oxygen presses 0.85MPa control, by 8.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen rifle rifle
For potential drop to 0.9m, oxygen presses 0.85MPa control, presses 12.8kg/t respectivelySteel、10.8kg/tSteel、3.5kg/tSteelAmount, be added conventional
Active lime, light dolomite, magnesite ball slag making, by 1.3kg/tSteelAmount, be added following mass ratio slagging agent promote slugging:
CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is for Fe and unavoidably
Impurity；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 0.8 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter.
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues lower oxygen rifle blowing
And secondary slag making is carried out, it blows to 380-420 seconds, control of lance position 1.1m, oxygen presses 0.85MPa control, presses respectively
10.5kg/tSteel、10.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, presses
1.1kg/tSteelAmount, be added following mass ratio slagging agent carry out slugging: CaO 21.5%, Al2O3 7.6%, FeO 14.6%,
Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；To 420-750 seconds, oxygen was pressed for blowing
0.85MPa control, control of lance position 1.2m；To 750-850 seconds, control of lance position 1.0m, oxygen was pressed for blowing
0.85MPa control, pressure rifle position (oxygen lance position 0.8m) is blown 30 seconds deeply when blowing was to 850 seconds carries out the sampling of falling furnace, the molten steel of falling furnace
Control requires: 1620 DEG C of temperature, C 0.20wt%, Mn 0.52wt%, P0.025wt%, S0.022wt%.
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 880 seconds-
Terminal is tapped the stage, and oxygen presses 0.85-0.90MPa control, and oxygen lance position is controlled by 0.9m, and terminal tapping molten steel control requires:
1650 DEG C of temperature, C 0.15wt%, P 0.022wt%, Mn 0.45wt%, S 0.020wt%.
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
3.0kg/tSteel；Tapping process is 23NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.15wt%, P 0.020wt%, Mn0.45wt%, S 0.018wt%, remaining is for Fe and unavoidably
Impurity.
Embodiment 3
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 150kg/tSteelSteel scrap dress
Enter proportion, the steel scrap of following mass ratio: C 0.22wt%, Si 0.60wt%, Mn 1.46wt%, P is added in 50 tons of LD converters
0.050wt%, S 0.048wt%, remaining is Fe and inevitable impurity；By 920kg/tSteelMolten iron be packed into proportion, 50
The high manganese high-silicon high ferrophosphorus water of ton LD converter addition following temperature and mass ratio: 1320 DEG C of molten iron temperature, hot metal composition C
5.2wt%, Si 1.00wt%, Mn 1.50wt%, P 0.170wt%, S 0.035wt%, remaining for Fe and inevitably it is impure
Object.
B, it smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, rocks back and forth
Furnace is opened by the exposed rear lower oxygen rifle of molten iron to be blown, and igniting oxygen pressure is 0.80~0.90MPa, opens and is blown to 20 seconds, and oxygen lance position is by 1.5m control
System, oxygen presses 0.85MPa control, by 9.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen rifle rifle
For potential drop to 0.9m, oxygen presses 0.85MPa control, presses 13.5kg/t respectivelySteel、12.5kg/tSteel、3.5kg/tSteelAmount, be added conventional
Active lime, light dolomite, magnesite ball slag making, by 1.7kg/tSteelAmount, be added following mass ratio slagging agent promote slugging:
CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is for Fe and unavoidably
Impurity；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 1.0 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter.
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues lower oxygen rifle blowing
And secondary slag making is carried out, it blows to 380-420 seconds, control of lance position 1.1m, oxygen presses 0.85MPa control, presses respectively
12.0kg/tSteel、11.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, presses
1.5kg/tSteelAmount, be added following mass ratio slagging agent carry out slugging: CaO 21.5%, Al2O3 7.6%, FeO 14.6%,
Fe2O3 29.5%, MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity；To 420-750 seconds, oxygen was pressed for blowing
0.85MPa control, control of lance position 1.2m；To 750-850 seconds, control of lance position 1.0m, oxygen was pressed for blowing
0.85MPa control, pressure rifle position (oxygen lance position 0.8m) is blown 30 seconds deeply when blowing was to 850 seconds carries out the sampling of falling furnace, the molten steel of falling furnace
Control requires: 1630 DEG C of temperature, C 0.25wt%, Mn 0.65wt%, P 0.030wt%, S 0.025wt%.
D, converter smelting latter stage technique: grate continues the blowing of lower oxygen rifle after the sampling of falling furnace of step C molten steel, blowing to 880 seconds-
Terminal is tapped the stage, and oxygen presses 0.85-0.90MPa control, and oxygen lance position is controlled by 0.9m, and terminal tapping molten steel control requires:
1660 DEG C of temperature, C 0.18wt%, P 0.025wt%, Mn 0.55wt%, S 0.025wt%.
E, converter tapping technique: active lime wash heat is added in ladle bottom before D step molten steel is tapped, and lime adding amount is
3.0kg/tSteel；Tapping process is 25NL/min using whole bottom argon blowing technology, argon flow control；Finally obtain with following
The molten steel of weight percent: C 0.18wt%, P 0.025wt%, Mn 0.55wt%, S 0.022wt%, remaining is Fe and can not keep away
The impurity exempted from.
Claims (7)
1. a kind of high manganese high-silicon high ferrophosphorus water of converter smelting proposes the preparation method that carbon protects manganese, it is characterised in that walked including following technique
It is rapid:
A, smelt and be packed into technique: whole finishing slags in converter are poured out in upper furnace steel tapping after splashing slag, by 130-150kg/tSteelIt is useless
Steel is packed into proportion, and steel scrap is added in 50 tons of LD converters；By 920-940kg/tSteelMolten iron be packed into proportion, be added in 50 tons of LD converters
The high manganese high-silicon high ferrophosphorus water of following temperature and mass ratio: molten iron temperature >=1290 DEG C, hot metal composition C 4.5-5.2wt%, Si
0.70-1.00wt%, Mn 1.10-1.50wt%, P 0.120-0.170wt%, S≤0.035wt%, remaining is for Fe and unavoidably
Impurity；
B, smelting process early period: after the low silicon high phosphorus hot metal of the high manganese of step A and steel scrap cold burden 50 tons of LD converters of loading, front and back grate is allowed
Lower oxygen rifle, which is opened, after molten iron is exposed blows, and igniting oxygen pressure is 0.80~0.90MPa, opens and is blown to 20 seconds, oxygen lance position is controlled by 1.4-1.5m
System, oxygen presses 0.85MPa control, by 7.2-9.2kg/tSteelAmount, regular activated lime slag making is added；Blowing was to 20-70 seconds, oxygen
Rifle rifle position is down to 0.9m, and oxygen presses 0.85MPa control, presses 10.9-13.5kg/t respectivelySteel、9.2-12.5kg/tSteel、3.5kg/tSteel
Amount, regular activated lime, light dolomite, magnesite ball slag making is added, by 0.9-1.7kg/tSteelAmount, be added slagging agent promote
Slugging；Blowing was to 70-300 seconds, and oxygen lance position rises to 1.0m, and oxygen presses 0.85MPa control, by 0.5-1.0 kg/tSteelAmount add
Enter conventional iron ore coolant；Blowing lifted oxygen rifle when blowing to 350 seconds and shakes to 300-350 second, control of lance position 1.1m
Part pre-slag is poured out in lower converter；
C, mid-term smelting process: after step B molten steel grate pours out part pre-slag, converter is shaken and just continues the blowing of lower oxygen rifle and goes forward side by side
The secondary slag making of row, blew to 380-420 seconds, and control of lance position 1.1m, oxygen presses 0.85MPa control, pressed 9.0- respectively
12.0kg/tSteel、9.0-11.0kg/tSteelAmount, regular activated lime, light dolomite is added and carries out secondary smelting slag making again, presses
0.8-1.5kg/tSteelAmount, be added slagging agent carry out slugging；To 420-750 seconds, oxygen pressed 0.85MPa control, oxygen rifle rifle for blowing
Position control is 1.2m；To 750-850 seconds, oxygen pressed 0.85MPa control for blowing, and control of lance position 1.0m blew to 850 seconds
When pressure rifle position to oxygen lance position be that 0.8m blows deeply and carries out within 30 seconds fall furnace sampling, 1610~1630 DEG C of the liquid steel temperature of falling furnace of control；
D, converter smelting latter stage technique: grate continues lower oxygen rifle blowing, blowing to 880 seconds-terminal after the sampling of falling furnace of step C molten steel
Tapping stage, oxygen press 0.85-0.90MPa control, and oxygen lance position is controlled by 0.8-0.9m, control terminal tapping liquid steel temperature
1640~1660 DEG C；
E, converter tapping technique: active lime wash heat, lime adding amount 3.0kg/ is added in ladle bottom before D step molten steel is tapped
tSteel；Tapping process is 20~25NL/min using whole bottom argon blowing technology, argon flow control；It finally can be obtained and mention carbon guarantor's manganese
Smelting molten steel.
2. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
The steel scrap described in step A includes the ingredient of following mass ratio: C 0.17-0.22wt%, Si 0.40-0.60wt%, Mn
1.25-1.46wt%, P 0.036-0.050wt%, S0.035-0.048wt%, remaining is Fe and inevitable impurity.
3. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
In the ingredient that the slagging agent includes following mass ratio: CaO 21.5%, Al2O3 7.6%, FeO 14.6%, Fe2O3 29.5%,
MnO 5.4%, S 0.15%, remaining is Fe and inevitable impurity.
4. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
It is specially the pre-slag for pouring out 1/3-2/3 that part pre-slag is poured out described in the step B.
5. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
The component requirements of the molten steel of falling furnace described in step C be C 0.15-0.25wt%, Mn 0.40-0.65wt%, P≤
0.030wt%、S≤0.025wt%。
6. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
The component requirements of the tapping molten steel of the terminal described in step D are C 0.10-0.18wt%, P≤0.025wt%, Mn 0.35-
0.55wt%、S≤0.025wt%。
7. the high manganese high-silicon high ferrophosphorus water of converter smelting according to claim 1 proposes the preparation method that carbon protects manganese, feature exists
The smelting molten steel that carbon protects manganese is mentioned described in the step E has the ingredients of following weight percents: 0.10~0.18wt% of C, P≤
0.025wt%, Mn0.35-0.55wt%, S≤0.022wt%, remaining is Fe and inevitable impurity.
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| CN110117689A (en) * | 2019-06-11 | 2019-08-13 | 北京科技大学 | A method of based on high-silicon molten iron converter double slag process low phosphorus steel by smelting |
| CN110592461A (en) * | 2019-08-30 | 2019-12-20 | 石钢京诚装备技术有限公司 | Smelting method of alloy structural steel 45CrNi |
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| CN112708719A (en) * | 2020-12-15 | 2021-04-27 | 安徽长江钢铁股份有限公司 | Converter steelmaking method by replacing full amount of scrap steel with iron slag |
| CN114622054A (en) * | 2022-03-04 | 2022-06-14 | 山东钢铁集团永锋临港有限公司 | Method for improving converter end-point manganese ratio |
| CN116103462A (en) * | 2023-02-27 | 2023-05-12 | 天铁热轧板有限公司 | Method for controlling splashing of steelmaking converter by utilizing oxygen lance |
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| CN112708719A (en) * | 2020-12-15 | 2021-04-27 | 安徽长江钢铁股份有限公司 | Converter steelmaking method by replacing full amount of scrap steel with iron slag |
| CN112708719B (en) * | 2020-12-15 | 2022-03-15 | 安徽长江钢铁股份有限公司 | Converter steelmaking method by replacing full amount of scrap steel with iron slag |
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| CN116103462A (en) * | 2023-02-27 | 2023-05-12 | 天铁热轧板有限公司 | Method for controlling splashing of steelmaking converter by utilizing oxygen lance |
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