CN108300837A - A kind of method for making steel - Google Patents
A kind of method for making steel Download PDFInfo
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- CN108300837A CN108300837A CN201810161893.6A CN201810161893A CN108300837A CN 108300837 A CN108300837 A CN 108300837A CN 201810161893 A CN201810161893 A CN 201810161893A CN 108300837 A CN108300837 A CN 108300837A
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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
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C21C2007/0093—Duplex process; Two stage processes
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of method for making steel, the method includes：Molten iron enters KR desulfurization, carries out taking off Slag treatment after desulfurizing agent stirring is added；The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, blows to the molten steel；When converter tapping, it is added granule lime and fluorite, steel sand aluminium deoxidation is added in when converter tapping, and Als requires >=0.030% after the converter tapping；CAS stoves enter the station 3 5min of pre- Argon；Ladle bottom blowing flow is adjusted, deslagging drop cover adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, Calcium treatment is carried out to molten steel using the calcium constituent in the alloy of class containing calcium line；Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.Solve that the LF refining time in the prior art is long, and slag charge consumption is big, power consumption is high, causes that the production cycle of low-sulfur hot rolling steel grade is long, technical problem of high cost, realizes that product quality is excellent, the easy to operate, technique effect that shortens smelting cycle, cost is greatly reduced.
Description
Technical field
The present invention relates to metallurgical technology field, more particularly to a kind of method for making steel.
Background technology
In recent years since excess capacity occur in part high-end product and low-end product, cause product market competition fierce,
Profit margin glides, and threatens the survival and development of iron and steel enterprise.Most steel mill production deck of boat, container etc. are excellent both at home and abroad at present
Matter Hi-Stren steel (HSLA) generally uses " BOF-LF- (RH or VD)-CC " process route, wherein LF refining mainly to carry on a shoulder pole
Negative molten steel desulfurizing, deoxidation and removal of inclusions task.
But present inventor has found the above-mentioned prior art extremely during technical solution in realizing the embodiment of the present application
It has the following technical problems less：
Since the LF refining time is long in the prior art, slag charge consumption is big, and power consumption is high, causes the production week of low-sulfur hot rolling steel grade
Phase length, technical problem of high cost.
Invention content
An embodiment of the present invention provides a kind of method for making steel, to solve the LF refining time in the prior art long, slag charge, electricity
Can consumption it is big, cause that the production cycle of low-sulfur hot rolling steel grade is long, technical problem of high cost, realize that product quality is excellent, behaviour
Make technique effect that is simple, shortening smelting cycle, cost is greatly reduced.
To solve the above-mentioned problems, an embodiment of the present invention provides a kind of method for making steel, the method includes：
After molten iron enters KR desulfurization station, desulfurizing agent is added according to 7-10kg/t in molten iron, stirs 10-15min, stirring knot
Processing of skimming is carried out after beam；When molten steel sulfur content reaches≤0.0001, desulfurization terminates；
The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, blows to the molten steel；
When converter tapping, it is added 7-9kg/t granules lime and 1-3kg/t fluorites, steel shot aluminum is added in when converter tapping
Deoxidation, Als requires >=0.030% after the converter tapping；
CAS stoves enter the station pre- Argon 3-5min；
Ladle bottom blowing flow is adjusted, deslagging drop cover adjusts molten steel composition and temperature；
Adjust ladle bottom blowing flow, feed the alloy of class containing calcium line, using the calcium constituent in the alloy of class containing calcium line to molten steel into
Row Calcium treatment；
Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.
Preferably, the mass percent of the desulfurizing agent main component is 77%≤CaO≤82%, 5%≤CaF2≤
10%, 5%≤MgO≤10%, SiO2≤ 5%, S≤0.07%.
Preferably, the granularity of the desulfurizing agent main component is≤3mm, wherein the particle of the desulfurizing agent main component
It is more than 70% to spend ＜ 1mm.
Preferably, sulfur content mass percent is≤0.003% in the low-sulfur steel scrap.
Preferably, sulfur content mass percent is≤0.02% in the low-sulfur slag charge.
Said one in the embodiment of the present invention or multiple technical solutions at least have following one or more technology effects
Fruit：
1, an embodiment of the present invention provides a kind of method for making steel, the method includes：After molten iron enters KR desulfurization station, it will take off
Sulphur agent is added according to 7-10kg/t in molten iron, stirs 10-15min, carries out taking off Slag treatment after stirring；When molten steel sulfur content reaches
When to≤0.0001, desulfurization terminates；The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, to the molten steel into
Row blowing；When converter tapping, it is added 7-9kg/t granules lime and 1-3kg/t fluorites, it is de- that steel shot aluminum is added in when converter tapping
Oxygen, Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre- Argon 3-5min；Adjust ladle bottom blowing flow, deslagging
Drop cover, adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, using in the alloy of class containing calcium line
Calcium constituent to molten steel carry out Calcium treatment；Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.Solve existing skill
In art due to LF refining time in the prior art it is long, slag charge consumption is big, and power consumption is high, causes the production cycle of low-sulfur hot rolling steel grade
Technical problem long, of high cost can substitute the smelting process of traditional hot rolling kind BOF-LF- (RH or VD)-CC, realize comprehensively
Shorten smelting cycle, reduce refining process temperature drop, product quality is excellent, the technique effect of cost is greatly lowered.
2, for the present invention by desulfurizing agent, the mass percent of the desulfurizing agent main component is 77%≤CaO≤82%,
5%≤CaF2≤ 10%, 5%≤MgO≤10%, SiO2≤ 5%, S≤0.07%.It solves in the prior art due to existing skill
The LF refining time is long in art, and slag charge consumption is big, and power consumption is high, causes production cycle length, the technology of high cost of low-sulfur hot rolling steel grade
Problem reaches desulfurization purpose using the stability of calcium sulfate chemically and physically, is not necessarily to double refining desulfurization, so as to shorten smelting
In the period, being furthermore achieved reduces cost, technique effect easy to operate.
3, the present invention is by desulfurizing agent, and the granularity of the desulfurizing agent main component is≤3mm, wherein the desulfurizing agent master
It is more than 70% to want the granularity ＜ 1mm of ingredient.Solve in the prior art since LF refining time in the prior art is long, slag charge
Consumption is big, and power consumption is high, causes that the production cycle of low-sulfur hot rolling steel grade is long, technical problem of high cost, by desulfurizing agent mainly at
The granularity proportioning divided, increases the interaction force between sorbent particle, increases surface-active, realize high-efficiency desulfurization,
Shorten the technique effect of smelting cycle.
4, the present invention is by low-sulfur steel scrap, and sulfur content mass percent is≤0.003% in the low-sulfur steel scrap.It solves existing
Have in technology since LF refining time in the prior art is long, slag charge consumption is big, and power consumption is high, causes the production of low-sulfur hot rolling steel grade
Period length, technical problem of high cost, reduce the amount of bringing into of sulphur, and then ensure that blowing dephosphorization, carbonization treatment effect, realize
The technique effect of the excellent low-sulfur hot rolling steel grade of the quality of production.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, below the special specific implementation mode for lifting the present invention.
Specific implementation mode
An embodiment of the present invention provides a kind of method for making steel, to solve the LF refining time in the prior art
Long, slag charge consumption is big, and power consumption is high, causes production cycle length, the technical problem of high cost of low-sulfur hot rolling steel grade, realizes product
Good quality, the easy to operate, technique effect that shortens smelting cycle, cost is greatly reduced.
Technical solution in the embodiment of the present invention, general thought are as follows：After molten iron enters KR desulfurization station, by desulfurizing agent according to
7-10kg/t is added in molten iron, stirs 10-15min, carries out taking off Slag treatment after stirring；When molten steel sulfur content reaches≤
When 0.0001, desulfurization terminates；The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, the molten steel is blown
Refining；When converter tapping, it being added 7-9kg/t granules lime and 1-3kg/t fluorites, steel sand aluminium deoxidation is added in when converter tapping,
Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre- Argon 3-5min；Adjust ladle bottom blowing flow, deslagging drop
Cover adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, using in the alloy of class containing calcium line
Calcium constituent carries out Calcium treatment to molten steel；Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.Solve the prior art
The middle LF refining time is long, and slag charge consumption is big, and power consumption is high, and production cycle length, the technology of high cost of low-sulfur hot rolling steel grade is caused to ask
Topic, realizes that product quality is excellent, the easy to operate, technique effect that shortens smelting cycle, cost is greatly reduced.
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
Embodiment one
An embodiment of the present invention provides a kind of method for making steel, the method includes：After molten iron enters KR desulfurization station, by desulfurization
Agent is added according to 7-10kg/t in molten iron, stirs 10-15min, carries out taking off Slag treatment after stirring；When molten steel sulfur content reaches
When≤0.0001, desulfurization terminates；The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, the molten steel is carried out
Blowing；When converter tapping, it is added 7-9kg/t granules lime and 1-3kg/t fluorites, it is de- that steel shot aluminum is added in when converter tapping
Oxygen, Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre- Argon 3-5min；Adjust ladle bottom blowing flow, deslagging
Drop cover, adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, using in the alloy of class containing calcium line
Calcium constituent to molten steel carry out Calcium treatment；Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.
Further, the mass percent of the desulfurizing agent main component is 77%≤CaO≤82%, 5%≤CaF2≤
10%, 5%≤MgO≤10%, SiO2≤ 5%, S≤0.07%.The granularity of the desulfurizing agent main component is≤3mm,
Described in the granularity ＜ 1mm of desulfurizing agent main component be more than 70%.Sulfur content mass percent is in the low-sulfur steel scrap
≤ 0.003%.Sulfur content mass percent is≤0.02% in the low-sulfur slag charge.
Specifically, after molten iron enters KR desulfurization station, desulfurizing agent is added according to 7-10kg/t in molten iron, 10- is stirred
15min carries out taking off Slag treatment after stirring；When molten steel sulfur content reaches≤0.0001, desulfurization terminates.The desulfurizing agent master
It is 77%≤CaO≤82%, 5%≤CaF to want the mass percent of ingredient2≤ 10%, 5%≤MgO≤10%, SiO2≤ 5%, S
≤ 0.07%.The granularity of the desulfurizing agent main component is≤3mm, wherein the granularity ＜ of the desulfurizing agent main component
1mm is more than 70%.S belongs to objectionable impurities elements, will increase material fragility, sulphur harm maximum to steel is the heat for causing steel
It is crisp.The desulfurizing agent for selecting mentioned component proportioning, can increase the activity of desulfurizing agent, significant desulfurization effect, the quantity of slag is few, will not change
Other chemical compositions of molten iron.The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, blowing dephosphorization is carried out, takes off
Carbon processing, obtain decarburization molten steel, blow to the molten steel, in the low-sulfur steel scrap sulfur content mass percent be≤
0.003%, sulfur content mass percent is≤0.02% in the low-sulfur slag charge.When converter tapping, it is white that 7-9kg/t granules are added
Ash and 1-3kg/t fluorites, fluorite is fluxing agent, and main component is CaF2, plays the role of the mobility for improving clinker, fluorite
Fluxing action is fast, the time is short, but excessive use fluorite can form serious foamed slag, leads to splash, while also aggravating to furnace lining
Erosion, and pollute environment, therefore, should strictly control a ton steel fluorite addition.Steel sand aluminium deoxidation is added when the converter tapping,
Als requires >=0.030% after the converter tapping, and steel shot aluminum absorptivity is high, and deoxidation effect is good, will not be introduced to molten steel other miscellaneous
Matter makes molten steel can further steady production.CAS stoves enter the station pre- Argon 3-5min, and Argon stirring power increases steel-slag interface and biography
Matter, heat transfer rate strengthen slag-metal reaction, improve rate of sulphur expulsion, reduce dissolved oxygen, and promotion is mingled with floating, plays and improves molten steel matter
The technique effect of amount.Ladle bottom blowing flow is adjusted, deslagging drop cover adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, is fed
Enter the alloy of class containing calcium line, Calcium treatment is carried out to molten steel using the calcium constituent in the alloy of class containing calcium line, class containing calcium line is added in molten steel
Deoxidation, desulphurization reaction occur for alloy, while reacting with the field trash in steel and being modified to field trash, improve the cleaning of molten steel
Degree, meanwhile, it can play the role of reducing harm of the high-melting-point field trash to subsequent product quality.Ladle bottom blowing flow is adjusted, into
Row soft blow operation terminates until processing, and soft blow operation, which mainly reaches, further promotes inclusion floating and the technology of purification of molten steel effect
Fruit.
Embodiment two
An embodiment of the present invention provides a kind of method for making steel, the method certain large-scale steel mill " KR desulfurization → 300t at home
Bessemerize (calmness tapping) → 300t CAS refinings → continuous cast " commercial introduction is had been realized in technological process, with 3 stoves
Typical heat is embodiment.
Test heat 1：After molten iron enters KR desulfurization station, 3.6t desulfurizing agents are added in molten iron, stir 15min, stirring knot
Processing of skimming is carried out after beam；When molten steel sulfur content reaches≤0.0001, desulfurization terminates；The molten iron is blended into converter, is added
The self-produced high calcium active lime of the self-produced sinters of 2.43t, 10.3t, 2.96t outsourcings light dolomite, 4.3t dolomites, 0.583t are special
Grade fluorite, the self-produced steel scraps of 40t, blow to the molten steel；When converter tapping, 2.3t granules lime and 233kg fluorites is added,
466kg steel sand aluminium deoxidations are added when the converter tapping, Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre-
Argon 3min；Ladle bottom blowing flow is adjusted to 300Nl/min, deslagging drop cover adjusts molten steel composition and temperature；Adjust ladle bottom blowing
Flow feeds pure calcium line 300m, and Calcium treatment is carried out to molten steel using the calcium constituent in pure calcium line；Adjust ladle bottom blowing flow extremely
100Nl/min carries out soft blow operation until processing terminates.The experiment heat processing terminates, sulfur content in low-sulfur hot rolling steel grade
It is 0.026%.
Embodiment three
Test heat 2：After molten iron enters KR desulfurization station, 4.3t desulfurizing agents are added in molten iron, stir 13min, stirring knot
Processing of skimming is carried out after beam；When molten steel sulfur content reaches≤0.0001, desulfurization terminates；The molten iron is blended into converter, is added
The self-produced high calcium active lime of the self-produced sinters of 2.8t, 9.35t, 2.9t outsourcings light dolomite, 4.42t dolomites, 0.536t are special
Grade fluorite, the self-produced steel scraps of 25t, blow to the molten steel；When converter tapping, 2.1t granules lime and 267kg fluorites is added,
556kg steel sand aluminium deoxidations are added when the converter tapping, Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre-
Argon 3min；Ladle bottom blowing flow is adjusted to 300Nl/min, deslagging drop cover adjusts molten steel composition and temperature；Adjust ladle bottom blowing
Flow feeds pure calcium line 290m, and Calcium treatment is carried out to molten steel using the calcium constituent in pure calcium line；Adjust ladle bottom blowing flow extremely
100Nl/min carries out soft blow operation until processing terminates.The experiment heat processing terminates, sulfur content in low-sulfur hot rolling steel grade
It is 0.033%.
Example IV
Test heat 3：After molten iron enters KR desulfurization station, 3.58t desulfurizing agents are added in molten iron, stir 14min, stirring knot
Processing of skimming is carried out after beam；When molten steel sulfur content reaches≤0.0001, desulfurization terminates；The molten iron is blended into converter, is added
The self-produced high calcium active lime of the self-produced sinters of 1.76t, 6.94t, 2.72t outsourcings light dolomite, 4.21t dolomites, 0.645t
The self-produced steel scrap of superfine fluorite, 25t, blows to the molten steel；When converter tapping, 2.33t granules lime and 277kg fireflies is added
526kg steel sand aluminium deoxidations are added when the converter tapping for stone, and Als requires >=0.030% after the converter tapping；CAS stoves enter the station
Pre- Argon 3min；Ladle bottom blowing flow is adjusted to 300Nl/min, deslagging drop cover adjusts molten steel composition and temperature；Adjust Ladle Bottom
Wind drift amount feeds pure calcium line 310m, and Calcium treatment is carried out to molten steel using the calcium constituent in pure calcium line；Adjust ladle bottom blowing flow extremely
100Nl/min carries out soft blow operation until processing terminates.The experiment heat processing terminates, sulfur content in low-sulfur hot rolling steel grade
It is 0.029%.
The technical solution provided in the embodiment of the present application, has at least the following technical effects or advantages：
1, an embodiment of the present invention provides a kind of method for making steel, the method includes：After molten iron enters KR desulfurization station, it will take off
Sulphur agent is added according to 7-10kg/t in molten iron, stirs 10-15min, carries out taking off Slag treatment after stirring；When molten steel sulfur content reaches
When to≤0.0001, desulfurization terminates；The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, to the molten steel into
Row blowing；When converter tapping, it is added 7-9kg/t granules lime and 1-3kg/t fluorites, it is de- that steel shot aluminum is added in when converter tapping
Oxygen, Als requires >=0.030% after the converter tapping；CAS stoves enter the station pre- Argon 3-5min；Adjust ladle bottom blowing flow, deslagging
Drop cover, adjusts molten steel composition and temperature；Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, using in the alloy of class containing calcium line
Calcium constituent to molten steel carry out Calcium treatment；Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.Solve existing skill
In art due to LF refining time in the prior art it is long, slag charge consumption is big, and power consumption is high, causes the production cycle of low-sulfur hot rolling steel grade
Technical problem long, of high cost can substitute the smelting process of traditional hot rolling kind BOF-LF- (RH or VD)-CC, realize comprehensively
Shorten smelting cycle, reduce refining process temperature drop, product quality is excellent, the technique effect of cost is greatly lowered.
2, for the present invention by desulfurizing agent, the mass percent of the desulfurizing agent main component is 77%≤CaO≤82%,
5%≤CaF2≤ 10%, 5%≤MgO≤10%, SiO2≤ 5%, S≤0.07%.It solves in the prior art due to existing skill
The LF refining time is long in art, and slag charge consumption is big, and power consumption is high, causes production cycle length, the technology of high cost of low-sulfur hot rolling steel grade
Problem reaches desulfurization purpose using the stability of calcium sulfate chemically and physically, is not necessarily to double refining desulfurization, so as to shorten smelting
In the period, being furthermore achieved reduces cost, technique effect easy to operate.
3, the present invention is by desulfurizing agent, and the granularity of the desulfurizing agent main component is≤3mm, wherein the desulfurizing agent master
It is more than 70% to want the granularity ＜ 1mm of ingredient.Solve in the prior art since LF refining time in the prior art is long, slag charge
Consumption is big, and power consumption is high, causes that the production cycle of low-sulfur hot rolling steel grade is long, technical problem of high cost, by desulfurizing agent mainly at
The granularity proportioning divided, increases the interaction force between sorbent particle, increases surface-active, realize high-efficiency desulfurization,
Shorten the technique effect of smelting cycle.
4, the present invention is by low-sulfur steel scrap, and sulfur content mass percent is≤0.003% in the low-sulfur steel scrap.It solves existing
Have in technology since LF refining time in the prior art is long, slag charge consumption is big, and power consumption is high, causes the production of low-sulfur hot rolling steel grade
Period length, technical problem of high cost, reduce the amount of bringing into of sulphur, and then ensure that blowing dephosphorization, carbonization treatment effect, realize
The technique effect of the excellent low-sulfur hot rolling steel grade of the quality of production.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications can be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out the embodiment of the present invention various modification and variations without departing from this hair
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (5)
1. a kind of method for making steel, which is characterized in that the method includes：
After molten iron enters KR desulfurization station, desulfurizing agent is added according to 7-10kg/t in molten iron, 10-15min is stirred, after stirring
It carries out taking off Slag treatment；When molten steel sulfur content reaches≤0.0001, desulfurization terminates；
The molten iron is blended into converter, low-sulfur steel scrap and low-sulfur slag charge is added, blows to the molten steel；
When converter tapping, it being added 7-9kg/t granules lime and 1-3kg/t fluorites, steel sand aluminium deoxidation is added in when converter tapping,
Als requires >=0.030% after the converter tapping；
CAS stoves enter the station pre- Argon 3-5min；
Ladle bottom blowing flow is adjusted, deslagging drop cover adjusts molten steel composition and temperature；
Ladle bottom blowing flow is adjusted, the alloy of class containing calcium line is fed, calcium is carried out to molten steel using the calcium constituent in the alloy of class containing calcium line
Processing；
Ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.
2. the method as described in claim 1, which is characterized in that the mass percent of the desulfurizing agent main component be 77%≤
CaO≤82%, 5%≤CaF2≤ 10%, 5%≤MgO≤10%, SiO2≤ 5%, S≤0.07%.
3. the method as described in claim 1, which is characterized in that the granularity of the desulfurizing agent main component is≤3mm, wherein
The granularity ＜ 1mm of the desulfurizing agent main component are more than 70%.
4. the method as described in claim 1, which is characterized in that in the low-sulfur steel scrap sulfur content mass percent be≤
0.003%.
5. the method as described in claim 1, which is characterized in that in the low-sulfur slag charge sulfur content mass percent be≤
0.02%.
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| CN109880972A (en) * | 2019-04-01 | 2019-06-14 | 山东钢铁集团日照有限公司 | A kind of SPHC low-carbon class steel grade production technology |
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| CN102212651A (en) * | 2011-06-02 | 2011-10-12 | 首钢总公司 | Steel ladle powder injection desulfuration refining process for low-sulfur steel production |
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
| CN105385811A (en) * | 2015-11-27 | 2016-03-09 | 山东钢铁股份有限公司 | Production method for steel containing aluminum |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212651A (en) * | 2011-06-02 | 2011-10-12 | 首钢总公司 | Steel ladle powder injection desulfuration refining process for low-sulfur steel production |
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
| CN105385811A (en) * | 2015-11-27 | 2016-03-09 | 山东钢铁股份有限公司 | Production method for steel containing aluminum |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109880972A (en) * | 2019-04-01 | 2019-06-14 | 山东钢铁集团日照有限公司 | A kind of SPHC low-carbon class steel grade production technology |
| CN109880972B (en) * | 2019-04-01 | 2021-04-13 | 山东钢铁集团日照有限公司 | Production process of SPHC low-carbon steel |
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