CN110229944A - A kind of method of low phosphorus steel by smelting semisteel - Google Patents
A kind of method of low phosphorus steel by smelting semisteel Download PDFInfo
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- CN110229944A CN110229944A CN201910469454.6A CN201910469454A CN110229944A CN 110229944 A CN110229944 A CN 110229944A CN 201910469454 A CN201910469454 A CN 201910469454A CN 110229944 A CN110229944 A CN 110229944A
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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
- C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a kind of methods of low phosphorus steel by smelting semisteel, method particularly includes: lime is added into half ladle of vanadium extraction, fritting is carried out to lime, after steelmaking converter is blended into half steel, it is blended into steel scrap again, cinder inclusion slugging is added in Primary period, lime is added, dolomite adjusts basicity of slag, basicity of slag is 1.5~2.0, and liquid steel temperature control is at 1450~1500 DEG C within the 6min that blows early period；It blows after 6min, lime, concurrent heating agent is added；Terminal basicity of slag be 2.5~3.0,1630~1670 DEG C of endpoint molten steel temperature, endpoint molten steel C:0.06~0.10%, S:0.01~0.08%, P:0.001~0.010%.The present invention controls molten steel terminal phosphorus 0.010% hereinafter, realize high scrap ratio, low iron loss, low slag charge, fast pace production.
Description
Technical field
The invention belongs to metallurgical steelmaking technical fields, and in particular to a kind of method of low phosphorus steel by smelting semisteel.
Background technique
In vanadium-bearing hot metal production process, progress vanadium extraction operation first, the molten iron after vanadium extraction is bessemerized half steel using half
Steel adds steel scrap as raw material.For phosphorus as harmful element in steel, content is lower lower on reinforcement property influence.Vanadium-bearing hot metal vanadium extraction
The more common molten iron of half steel temperature is high afterwards, and the constituent contents trace such as Si, Mn.Semisteel smelting initial stage slugging is difficult and temperature is higher than general
Logical molten iron, impacts low phosphorus steel by smelting.
In the prior art one is Dephosphorising agent etc. is added to improve dephosphorization effect, such Dephosphorising agent certainly will increase steel-making at
This；Another kind is using double slag dephosphorization methods, although the consumption of such method slag charge is less, the process of falling slag will cause the stream of ferro element
It becomes estranged the extension of smelting cycle.
In conclusion how to solve the problems, such as that vanadium-bearing hot metal low phosphorus steel by smelting exists, while realizing that inexpensive fast pace is raw
It produces, is the major issue for being badly in need of studying and solving.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of methods of low phosphorus steel by smelting semisteel.The invention, which can be improved, to be turned
Stokehold phase slagging speed, control blowing temperature early period, improve dephosphorization effect, by molten steel terminal phosphorus control 0.010% hereinafter, and
Realize high scrap ratio, low iron loss, low cost, fast pace production.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of method of low phosphorus steel by smelting semisteel,
It the described method comprises the following steps:
(1) vanadium-bearing hot metal is blended into converter extracting vanadium and carries out vanadium extraction operation, after vanadium extraction has gone out half steel, lime 2 is added into half ladle
~5 ㎏/t steel are added on half ladle liquid level by high hopper, carry out fritting to lime, and half steel temperature is 1360~1420 DEG C,
Half steel carbon 3.6~4.2%, S:0.01~0.08%, half steel phosphorus≤0.18%；
(2) after steelmaking converter is blended into half steel, then it is blended into steel scrap, 0~10 ㎏ of cinder inclusion/t tempering slag, slugging is added in Primary period
Afterwards, 5~10 ㎏ of lime/t steel, 8~13 ㎏ of dolomite/t steel is added and adjusts basicity of slag, basicity of slag is 1.5~2.0, early period
Liquid steel temperature control is at 1450~1500 DEG C within blowing 6min；
(3) blow mid-term, and after the 6min that blows, 5~10 ㎏ of lime/t steel, 5~15 ㎏ of concurrent heating agent/t steel is added；
(4) it blowing the later period, pressure rifle operates 1~1.5min, and terminal basicity of slag is 2.5~3.0, endpoint molten steel temperature 1630~
1670 DEG C, endpoint molten steel C:0.06~0.10%, S:0.01~0.08%, P:0.001~0.010%.
After step (1) vanadium extraction of the present invention has gone out half steel, clinker all reservations in a heat furnace on steelmaking converter are led to
Cross and 2~5 ㎏/t steel dolomite is added carries out slag splashing, rifle position control in 0.7~1.5m, for the control of nitrogen pressure 0.9~
1.5MPa。
Steel scrap is slag iron and pure steel scrap mixture in step (2) of the present invention, and the adding amount of scrap steel is 100~160
㎏/t steel, wherein 30~50kg/t of slag iron steel, pure steel scrap are 70~110kg/t steel, are added in converter by overhead traveling crane handling；Slag iron
For converter original slag, pure steel scrap is continuous casting billet head, steel rolling tailing, outsourcing scrap iron and steel.
Primary period operation is constant flow in step (2) of the present invention, becomes rifle position and operates, oxygen blast flow 23000~
24000m3/ h, 1.3~1.7m of rifle position, slugging are completed within the 4min that blows.
Cinder inclusion in step (2) of the present invention: FeO >=17% is to obtain more than Con casting ladle pours by broken, screening, granularity
For 15~35mm；Dolomite: MgO >=30%, CaO >=40%, granularity are 15~35mm.
Concurrent heating agent is silicon carbide, nut coke in step (3) of the present invention.
Step (1) of the present invention, (2), lime in (3): MgO >=5%, CaO >=80%, granularity are 15~35mm.
Concurrent heating agent control is added within blowing 8min and finishes in step (3) of the present invention, when adding amount of scrap steel W is
100 ㎏/t steel≤W≤120 ㎏/t steel, concurrent heating agent Silicon carbide addition R are 3 ㎏/t steel≤R≤5 ㎏/t steel or nut coke additional amount R
For 4 ㎏/t steel≤R≤8 ㎏/t steel；When adding amount of scrap steel W is 120 ㎏/t steel < W≤140 ㎏/t steel, concurrent heating agent silicon carbide is added
Amount R is 5 ㎏/t steel < R≤7 ㎏/t steel or nut coke additional amount R is 8 ㎏/t steel < R≤12 ㎏/t steel；When adding amount of scrap steel W is
140 ㎏/t steel < W≤160 ㎏/t steel, concurrent heating agent Silicon carbide addition R are 7 ㎏/t steel < R≤9 ㎏/t steel or nut coke additional amount R
For 12 ㎏/t steel < R≤16 ㎏/t steel.
It blows the later period in blowing mid-term and the step (4) in step (3) of the present invention, oxygen blast operation is variable-flow,
Become rifle position operation, 23000~26000m of flow3/ h, 1.1~1.2m of rifle position.
Endpoint molten steel phosphorus≤0.010% after the method for the invention processing.
After vanadium extraction of the present invention has gone out half steel, lime is added into half ladle, plays the effect of pre-melted slag.Steelmaking converter is blended into
After half steel, then a large amount of steel scraps are blended into, control converting process mid-early stage temperature, while improving molten steel amount, reduces molten steel consumption.It is blowing
It refines and lime, dolomite, cinder inclusion is added early period, high rifle position, big stirring improve dephosphorization effect.Lime, concurrent heating is added in the mid-term that blows
Agent, lime remove steel grade harmful element for adjusting slag condition in furnace, and liquid steel temperature is augmented in concurrent heating agent, guarantees that aim carbon meets tapping
It is required that.
The beneficial effects of adopting the technical scheme are that 1, cinder inclusion of the present invention is slag iron more than Con casting ladle pours
For converter original slag, to transport to steel-making by broken, screening and eat, such material belongs to self-production material, processing charges is only paid,
Cost is relatively low, improves slugging speed, controls heating rate in furnace, improves clinker dephosphorization effect.2, the present invention will be a large amount of
Steel scrap is added in converter, is effectively controlled and turns in-furnace temperature, extends the dephosphorisation reaction time, improves dephosphorization rate, increase simultaneously
Tap, reduces steel-making cost.3, the present invention is by temperature control and residue adjustment, using low temperature, high alkalinity, big quantity of slag condition by steel
The control of water terminal phosphorus is 0.010% hereinafter, Primary period is without falling slag operation, avoiding the loss of iron and making the slag charge of double slags
Loss.4, the reasonable application of concurrent heating agent of the present invention, improves temperature end point hit rate, improves under big scrap ratio, and temperature is insufficient
Phenomenon.5, molten steel terminal phosphorus≤0.010% after the method for the present invention processing, outlet temperature, carbon meet the demand of steel grade, realize high
Scrap ratio, low iron loss, low slag charge, fast pace production.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 4.3 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.3m early period, the later period splashes slag rifle position 0.8m, controls for nitrogen pressure in 1.2MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1385 DEG C, half steel: C:4.01%, S:0.045%, P:
0.135%；5 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, fritting is carried out to lime；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 136 ㎏/t steel, wherein 40 ㎏ of slag iron/t steel,
Pure 96 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；6.2 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23506m3/ h, rifle position 1.7m, slugging time are 2min41s, and flow is constant after slugging, rifle position 1.4m, be added 8 ㎏ of lime/t steel,
12 ㎏ of dolomite/t steel, basicity of slag 1.6, early period blow 1488 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 23506m39.3 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
6.2 ㎏ of silicon carbide/t steel is added when 7min, silicon carbide is finished in blowing 7min40s addition；
(4) it blows the later period, after the 9min that blows, rifle position is constantly reduced according to operation, flow is adjusted, before blowing end point
Motionless 1min10s rifle position is 1.1m, flow 25800m3/ h, terminal basicity of slag be 2.7,1660 DEG C of endpoint molten steel temperature, terminal
Molten steel C:0.08%, S:0.032%, P:0.008%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 2
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 3.8 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.4m early period, the later period splashes slag rifle position 0.9m, controls for nitrogen pressure in 1.4MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1395 DEG C, half steel: C:3.95%, S:0.035%, P:
0.155%；3.5 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, lime is carried out pre-
It is molten；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 130 ㎏/t steel, wherein 40 ㎏ of slag iron/t steel,
Pure 90 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；7.5 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23600m3/ h, rifle position 1.4m, slugging time are 2min39s, and flow is constant after slugging, rifle position 1.4m, be added 9 ㎏ of lime/t steel,
10 ㎏ of dolomite/t steel, basicity of slag 1.7, early period blow 1475 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 23600m310 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
11 ㎏ of nut coke/t steel is added when 6min30s, nut coke is finished in blowing 7min20s addition；
(4) it blows the later period, after the 9min that blows, rifle position is constantly reduced according to operation, flow is adjusted, before blowing end point
Motionless 1min13s rifle position is 1.1m, flow 25500m3/ h, terminal basicity of slag be 2.9,1657 DEG C of endpoint molten steel temperature, terminal
Molten steel C:0.07%, S:0.030%, P:0.009%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 3
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 4.1 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.3m early period, the later period splashes slag rifle position 0.7m, controls for nitrogen pressure in 1.0MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1420 DEG C, half steel: C:3.75%, S:0.050%, P:
0.138%；2.5 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, lime is carried out pre-
It is molten；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 140 ㎏/t steel, wherein 45 ㎏ of slag iron/t steel,
Pure 95 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；6 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23700m3/ h, rifle position 1.7m, slugging time are 3min15s, and flow is constant after slugging, rifle position 1.4m, and 10 ㎏ of lime/t is added
Steel, 8 ㎏ of dolomite/t steel, basicity of slag 1.8, early period blow 1491 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 23700m35 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
11.5 ㎏ of nut coke/t steel is added when 6min30s, nut coke is finished in blowing 7min50s addition；
(4) it blows the later period, after the 9min that blows, rifle position is constantly reduced according to operation, flow is adjusted, before blowing end point
Motionless 1min5s rifle position is 1.1m, flow 25600m3/ h, terminal basicity of slag be 2.6,1649 DEG C of endpoint molten steel temperature, terminal
Molten steel C:0.06%, S:0.033%, P:0.0076%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 4
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 2.5 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.2m early period, the later period splashes slag rifle position 1.0m, controls for nitrogen pressure in 1.3MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1375 DEG C, half steel: C:3.82%, S:0.06%, P:
0.129%；4.5 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, lime is carried out pre-
It is molten；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 100 ㎏/t steel, wherein 30 ㎏ of slag iron/t steel,
Pure 70 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；5.3 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23200m3/ h, rifle position 1.5m, slugging time are 3min22s, and flow is constant after slugging, rifle position 1.3m, be added 7 ㎏ of lime/t steel,
9 ㎏ of dolomite/t steel, basicity of slag 1.9, early period blow 1463 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 23300m38.2 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.1m
3.0 ㎏ of silicon carbide/t steel is added when 6min55s, silicon carbide is finished in blowing 7min32s addition；
(4) it blows the later period, after the 9min that blows, rifle position is constantly reduced according to operation, flow is adjusted, before blowing end point
Motionless 1min25s rifle position is 1.2m, flow 25300m3/ h, terminal basicity of slag be 2.8,1670 DEG C of endpoint molten steel temperature, terminal
Molten steel C:0.06%, S:0.035%, P:0.0010%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 5
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 3.3 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.1m early period, the later period splashes slag rifle position 0.7m, controls for nitrogen pressure in 1.1MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1405 DEG C, half steel: C:3.64%, S:0.08%, P:
0.156%；3 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, fritting is carried out to lime；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 140 ㎏/t steel, wherein 45 ㎏ of slag iron/t steel,
Pure 95 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；3.6 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23850m3/ h, rifle position 1.6m, slugging time are 3min51s, and flow is constant after slugging, rifle position 1.4m, and 6.5 ㎏ of lime/t is added
Steel, 11 ㎏ of dolomite/t steel, basicity of slag 1.7, early period blow 1452 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 24700m36.5 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
6.8 ㎏ of silicon carbide/t steel is added when 7min15s, silicon carbide is finished in blowing 7min58s addition；
(4) it blows the later period, pressure rifle operates 1min15s, flow 23500m3/ h, rifle position 1.1m, terminal basicity of slag are 2.6, terminal
1630 DEG C of liquid steel temperature, endpoint molten steel C:0.1%, S:0.025%, P:0.008%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 6
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 2.2 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.3m early period, the later period splashes slag rifle position 0.8m, controls for nitrogen pressure in 1.2MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1415 DEG C, half steel: C:4.12%, S:0.034%, P:
0.132%；2 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, fritting is carried out to lime；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 120 ㎏/t steel, wherein 35 ㎏ of slag iron/t steel,
Pure 85 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；8.8 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23450m3/ h, rifle position 1.3m, slugging time are 2min52s, and flow is constant after slugging, rifle position 1.6m, and 5.5 ㎏ of lime/t is added
Steel, 10.5 ㎏ of dolomite/t steel, basicity of slag 1.6, early period blow 1483 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 25400m37.3 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
4.8 ㎏ of silicon carbide/t steel is added when 6min32s, silicon carbide is finished in blowing 7min34s addition；
(4) it blows the later period, pressure rifle operates 1min27s, flow 24800m3/ h, rifle position 1.2m, terminal basicity of slag are 2.9, terminal
1635 DEG C of liquid steel temperature, endpoint molten steel C:0.08%, S:0.025%, P:0.007%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 7
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 2.0 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 1.5m early period, the later period splashes slag rifle position 0.9m, controls for nitrogen pressure in 1.5MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1360 DEG C, half steel: C:4.20%, S:0.08%, P:
0.180%；5 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, fritting is carried out to lime；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 160 ㎏/t steel, wherein 50 ㎏ of slag iron/t steel,
Pure 110 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；0 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
24000m3/ h, rifle position 1.7m, slugging time are 3min42s, and flow is constant after slugging, rifle position 1.3m, and 10 ㎏ of lime/t is added
Steel, 8 ㎏ of dolomite/t steel, basicity of slag 1.5, early period blow 1450 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 26000m35 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.2m
8.8 ㎏ of silicon carbide/t steel is added when 6min45s, silicon carbide is finished in blowing 7min38s addition；
(4) it blows the later period, pressure rifle operates 1min, flow 23000m3/ h, rifle position 1.1m, terminal basicity of slag are 2.5, terminal steel
1670 DEG C of coolant-temperature gage, endpoint molten steel C:0.065%, S:0.08%, P:0.010%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
Embodiment 8
A kind of method of low phosphorus steel by smelting semisteel of the present embodiment the following steps are included:
(1) it by clinker all reservations in a heat furnace on steelmaking converter, carries out splashing slag shield by the way that 5 ㎏/t steel dolomite is added
Furnace, splashes slag rifle position 0.7m early period, the later period splashes slag rifle position 0.8m, controls for nitrogen pressure in 0.9MPa；Vanadium-bearing hot metal is blended into vanadium extraction
Converter carries out vanadium extraction operation, and after vanadium extraction has gone out half steel, half steel temperature is 1420 DEG C, half steel: C:3.60%, S:0.01%, P:
0.132%；4 ㎏ of lime/t steel is added into half ladle, is added on half ladle liquid level by high hopper, fritting is carried out to lime；
(2) after steelmaking converter is blended into half steel, then be blended into steel scrap, adding amount of scrap steel be 150 ㎏/t steel, wherein 50 ㎏ of slag iron/t steel,
Pure 100 ㎏ of steel scrap/t steel are added in converter by overhead traveling crane handling；10 ㎏ of cinder inclusion/t tempering slag, flow is added in Primary period
23000m3/ h, rifle position 1.3m, slugging time are 4min, and flow is constant after slugging, rifle position 1.5m, and 5 ㎏ of lime/t steel, white is added
13 ㎏ of marble/t steel, basicity of slag 2.0, early period blow 1500 DEG C of 6min in-furnace temperature；
(3) blow mid-term, after the 6min that blows, flow 23000m310 ㎏ of lime/t steel, blowing is added in/h, rifle position 1.1m
16 ㎏ of nut coke/t steel is added when 6min39s, nut coke is finished in blowing 8min addition；
(4) it blows the later period, pressure rifle operates 1.5min, flow 26000m3/ h, rifle position 1.2m, terminal basicity of slag are 3.0, terminal
1640 DEG C of liquid steel temperature, endpoint molten steel C:0.07%, S:0.01%, P:0.009%.
Molten steel terminal phosphorus after the processing of the present embodiment method, outlet temperature, carbon meet the demand of steel grade, realize high steel scrap
Than, low iron loss, low slag charge, fast pace production.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of method of low phosphorus steel by smelting semisteel, which is characterized in that the described method comprises the following steps:
(1) vanadium-bearing hot metal is blended into converter extracting vanadium and carries out vanadium extraction operation, after vanadium extraction has gone out half steel, lime 2 is added into half ladle
~5 ㎏/t steel are added on half ladle liquid level by high hopper, carry out fritting to lime, and half steel temperature is 1360~1420 DEG C,
Half steel carbon 3.6~4.2%, S:0.01~0.08%, half steel phosphorus≤0.18%；
(2) after steelmaking converter is blended into half steel, then it is blended into steel scrap, 0~10 ㎏ of cinder inclusion/t tempering slag, slugging is added in Primary period
Afterwards, 5~10 ㎏ of lime/t steel, 8~13 ㎏ of dolomite/t steel is added and adjusts basicity of slag, basicity of slag is 1.5~2.0, early period
Liquid steel temperature control is at 1450~1500 DEG C within blowing 6min；
(3) blow mid-term, and after the 6min that blows, 5~10 ㎏ of lime/t steel, 3~16 ㎏ of concurrent heating agent/t steel is added；
(4) it blowing the later period, pressure rifle operates 1~1.5min, and terminal basicity of slag is 2.5~3.0, endpoint molten steel temperature 1630~
1670 DEG C, endpoint molten steel C:0.06~0.10%, S:0.01~0.08%, P:0.001~0.010%.
2. a kind of method of low phosphorus steel by smelting semisteel according to claim 1, which is characterized in that give up in the step (2)
Steel is slag iron and pure steel scrap mixture, and the adding amount of scrap steel is 100~160 ㎏/t steel, wherein 30~50kg/t of slag iron steel,
Pure steel scrap is 70~110kg/t steel, is added in converter by overhead traveling crane handling；Slag iron is converter original slag, and pure steel scrap is continuous casting billet head, rolls
Steel tailing, outsourcing scrap iron and steel.
3. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly Primary period operation is constant flow in (2), becomes rifle position operation, 23000~24000m of flow3/ h, 1.3~1.7m of rifle position change
Slag is completed within the 4min that blows.
4. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly cinder inclusion in (2): FeO >=17%, for Con casting ladle pour it is remaining obtained by broken, screening, granularity is 15~35mm；Dolomite:
MgO >=30%, CaO >=40%, granularity are 15~35mm.
5. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly concurrent heating agent is silicon carbide, nut coke in (3).
6. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly (1), (2), lime in (3): MgO >=5%, CaO >=80%, granularity are 15~35mm.
7. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly concurrent heating agent control is added and finishes within blowing 8min in (3), when adding amount of scrap steel W is 100 ㎏/t steel≤W≤120 ㎏/t
Steel, concurrent heating agent Silicon carbide addition R is 3 ㎏/t steel≤R≤5 ㎏/t steel or nut coke additional amount R is 4 ㎏/t steel≤R≤8 ㎏/t
Steel；When adding amount of scrap steel W is 120 ㎏/t steel < W≤140 ㎏/t steel, concurrent heating agent Silicon carbide addition R is 5 ㎏/R≤7 t steel <
㎏/t steel or nut coke additional amount R are 8 ㎏/t steel < R≤12 ㎏/t steel；When adding amount of scrap steel W be 140 ㎏/t steel < W≤160 ㎏/
T steel, concurrent heating agent Silicon carbide addition R be 7 ㎏/t steel < R≤9 ㎏/t steel or nut coke additional amount R be 12 ㎏/t steel < R≤16 ㎏/
T steel.
8. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the step
Suddenly it blows the later period in blowing mid-term and the step (4) in (3), oxygen blast operation is variable-flow, becomes rifle position operation, flow 23000
~26000m3/ h, 1.1~1.2m of rifle position.
9. a kind of method of low phosphorus steel by smelting semisteel according to claim 1 to 3, which is characterized in that the side
Endpoint molten steel phosphorus≤0.010% after method processing.
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