CN107201421B - A kind of production method of super-low sulfur molten steel - Google Patents
A kind of production method of super-low sulfur molten steel Download PDFInfo
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- CN107201421B CN107201421B CN201610154622.9A CN201610154622A CN107201421B CN 107201421 B CN107201421 B CN 107201421B CN 201610154622 A CN201610154622 A CN 201610154622A CN 107201421 B CN107201421 B CN 107201421B
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- converter
- mass percentage
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C5/36—Processes yielding slags of special composition
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of production method of super-low sulfur molten steel, the technical issues of mainly solving the molten steel high production cost of w [S]≤0.0040% in the converter tapping ladle chemistry of the production of converter smelting in the prior art, converter super-low sulfur smelting molten steel is realized.The technical solution of the present invention is as follows: a kind of production method of super-low sulfur molten steel, comprising the following steps: molten iron pre-desulfurization；Molten iron pre-desulfurization, hot metal charging；It bessemerizes；Converter tapping；Slag is fallen in converter.The present invention realizes the smelting of w [S]≤0.0040% in converter tapping ladle chemistry by the matching of the sulfur removal technology of molten iron pre-desulfurization device and the sulfur removal technology of converter.The process stabilizing of the method for the present invention, reduces production cost.
Description
Technical field
The present invention relates to a kind of production method of molten steel, in particular to a kind of production method of super-low sulfur molten steel belongs to and turns
Furnace steelmaking technical field.
Background technique
Steel splitting kind requires harshness to sulfur content in the middle part of high added value steel class at present, such as automobile steel, electrical sheet, generally requires steel
Middle sulphur mass percentage is less than or equal to 0.0060%, and traditional control mode is to arrange LF or carry out desulfurization into RH, this
On the one hand sample increases silicon in LF furnace desulfurization meeting nitrogen pick-up or molten steel, while will increase steel-making smelting cost；And desulfurization, meeting are carried out in RH
The dipping service life of RH is influenced, while field trash can be generated, the performance of silicon steel is had an impact, in addition will cause carburetting, to ultralow
The carbon control of carbon is unfavorable, therefore converter smelting ultralow-sulfur steel gradually draws attention.
Chinese application number CN201210050658.4 proposition be arranged in the case where converter control is unstable LF furnace into
Row steel spraying powder desulfurization；Chinese application number CN201110448292.1 realizes the production method of low-sulfur steel in duplex converter；In
State CN201110403476.6 discloses a kind of method that ultralow-sulfur steel is produced under high vacuum, in the prior art super-low sulfur molten steel
High production cost, the desulphurizing ability of molten iron pre-desulfurization device and the desulphurizing ability of converter fail to be effectively matched.
Summary of the invention
The object of the present invention is to provide a kind of production methods of super-low sulfur molten steel, mainly solve converter smelting in the prior art
In the converter tapping ladle chemistry of production the technical issues of the molten steel high production cost of w [S]≤0.0040%, converter is realized
Super-low sulfur smelting molten steel.
The technical solution adopted by the present invention is that: a kind of production method of super-low sulfur molten steel, comprising the following steps:
1) molten iron pre-desulfurization controls Sulfur Content in Hot Iron mass percentage≤0.002% after molten iron pre-desulfurization, is sprayed using mixing
Blow desulphurization mode, desulfurization powder use fluidization lime and deactivating magnesium powder, fluidization lime adding amount 1~5kg/t iron, passivated magnesium
Powder additional amount 0.2~0.9kg/t iron, mass percentage≤0.020% of sulphur, the quality percentage of CaO contain in fluidization lime
>=90% is measured, mass percentage >=90% of mass percentage≤0.020% of sulphur, Mg in deactivating magnesium powder；
2) top and bottom combined blown converter smelting molten steel is used, the weight percent of the raw material composition of investment metal major ingredient is molten iron
It is 89%~92%, steel scrap uses light-duty steel scrap, enters furnace molten iron temperature >=1320 DEG C, the quality percentage of sulphur in molten iron chemical component
Content≤0.002%, mass percentage≤0.020% of sulphur in light-duty steel scrap chemical component；
3) converter slag-making auxiliary material is added when converter oxygen gun leads to oxygen point fire and carries out slag making, converter slag-making auxiliary material is the raw stone of metallurgy
Ash, light dolomite, iron ore, wherein in metallurgical quick lime sulphur mass percentage≤0.030%, sulphur in light dolomite
Mass percentage≤0.035%, the mass percentage of mass percentage≤0.020%, FeO of sulphur in iron ore >=
58%；
4) converter steelmaking process controls, and control oxygen supply intensity is 2.5~3.5Nm3/ (mint), oxygen lance operation use oxygen
Atmospheric pressure is constant, and oxygen lance position alternates mode of operation in benchmark rifle position, low rifle position and high rifle position, bessemerizes control early period
System, control blowing oxygen quantity are the 20%~30% of total oxygen blast mass percent, and control of lance position provides suitable liter in high rifle position
Warm speed is used for slugging, and whole light dolomites is added, and the 80% of metallurgical quick lime total amount is added, iron ore total amount is added
50%~70%；Mid-term control is bessemerized, control of lance position is benchmark rifle position → low rifle position → high rifle position circulate operation, control
Blowing oxygen quantity processed is the 50%~70% of total oxygen blast mass percent, and remaining whole iron ores and metallurgical quick lime is added；Converter is blown
Later period control is refined, control blowing oxygen quantity is the 10%~20% of total oxygen blast mass percent, and control of lance position is first benchmark rifle position
Slugging is carried out, control blowing oxygen quantity is the 10% of total oxygen blast mass percent, and low rifle position carries out pressure slag, reinforces stirring later；Converter
Argon bottom-blowing flow control is in 0.05~0.08Nm3/(min·t)；The ton steel additional amount of metallurgical quick lime is 36~80kg；Gently
The ton steel additional amount of calcined dolomite is 8~18kg, and the ton steel additional amount of iron ore is 14~60kg；
5) converter smelting endpoint is handled, bessemerize in endpoint molten steel carbon mass percentage be 0.03%~0.06%,
End is bessemerized when bessemerizing endpoint molten steel temperature >=1650 DEG C, is tapped immediately after bessemerizing；
6) slag, dross are not splashed after converter tapping, clinker is all outwelled.
Step of the present invention is repeated, the smelting of next furnace molten steel is started.
Further, step 3) of the present invention and 4) in, mass percentage >=25% of MgO, iron ore in light dolomite
Mass percentage >=58% of middle FeO.
In step 4) of the present invention, light dolomite is added, controlling MgO mass percentage in converter smelting endpoint slag is
6%~8%, MgO mass percentage, which is higher than 8%, in converter smelting endpoint slag will affect the viscosity of converter slag to converter desulfurization
Unfavorable, MgO mass percentage is lower than 6% in converter smelting endpoint slag, and certain influence is generated to Converter condition, is unfavorable for turning
The direct motion of furnace production；Metallurgical quick lime is added, controls dual alkalinity (w (CaO)/w (SiO in converter smelting endpoint slag2)) it is 3.0
~5.0, dual alkalinity lower than 3.0 or can reduce desulfuration efficiency greater than 5.0 height in converter smelting endpoint slag.
In step 4) of the present invention, converter oxygen gun benchmark rifle position is H0+H0* (0.12~0.18), high rifle position are H0+H0*(0.2
~0.5), low rifle position is H0+H0* (0.05~0.10), H0For steel water surface elevation in converter.
The present invention controls molten steel sulfur content by limiting into furnace molten iron, steel scrap and slag making ratio of adjuvant and sulfur content
Source and converter enter furnace sulphur total amount；By the distribution of converter slag-making auxiliary material investment and the cooperation of amount of oxygen ratio, high temperature, high-alkali is formed
Degree, the preferable clinker of mobility, improve the desulphurizing ability of converter slag, realize in the tapping ladle chemistry of converter smelting
Sulphur mass percentage≤0.0040%.
The present invention has following good effect compared with prior art: 1, the present invention passes through the desulfurization work of molten iron pre-desulfurization device
The matching of skill and the sulfur removal technology of converter has broken the technical bottleneck of existing converter smelting super-low sulfur molten steel, has realized converter and go out
The molten steel production of mass percentage≤0.0040% of sulphur, the control for meeting sulphur in low-sulfur steel are wanted in steel ladle chemistry
It asks, high cost desulfurization process must be carried out in refining procedure when ultralow-sulfur steel being avoided to produce, reduce the production cost of low-sulfur steel.2,
The method of the present invention process stabilizing, ladle chemistry smelting shoot straight.
Specific embodiment
With reference to embodiment, the present invention is furture elucidated, it should be understood that following specific embodiments are only used for
It is bright the present invention rather than limit the scope of the invention.
Desulfurization station in the embodiment of the present invention uses mixed injection desulfurization method, and desulfurization powder is using fluidization lime and blunt
Change magnesium powder, converter is 150t top and bottom combined blown converter.The embodiment as shown in table 1 to table 6 is in SEDDQ automobile to smelt the trade mark
For slab, converter steelmaking process bottom blown gas is argon gas, and concrete operations are as follows:
1 molten iron pre-desulfurization parameter of the embodiment of the present invention of table
Sulfur content in the converter smelting metal charge of the present invention of table 2 proportion and supplementary material
3 present invention of table bessemerizes technological parameter early period
4 present invention of table bessemerizes mid-term technological parameter
5 present invention of table bessemerizes late stage process parameter
The converter smelting endpoint index of the present invention of table 6
The embodiment of the present invention 1~4, w [S] is respectively in converter tapping ladle chemistry in converter tapping ladle chemistry
It is 0.0028%, 0.0033%, 0.0037% and 0.0031%；It is 100% that converter molten steel, which is smelt rate, converter tapping molten steel chemistry
W [S]≤0.0040% in ingredient meets the requirement of low-sulfur steel Composition Control, meets the control requirement of sulphur in low-sulfur steel, avoid
Ultralow-sulfur steel must carry out high cost desulfurization process in refining procedure when producing, and reduce the production cost of low-sulfur steel.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (4)
1. a kind of production method of super-low sulfur molten steel, characterized in that the method the following steps are included:
1) molten iron pre-desulfurization controls Sulfur Content in Hot Iron mass percentage≤0.002% after molten iron pre-desulfurization, de- using mixed injection
Sulphur mode, desulfurization powder use fluidization lime and deactivating magnesium powder, fluidization lime adding amount 1~5kg/t iron, and deactivating magnesium powder adds
Enter amount 0.2~0.9kg/t iron, mass percentage≤0.020% of sulphur in fluidization lime, CaO mass percentage >=
90%, mass percentage >=90% of mass percentage≤0.020% of sulphur, Mg in deactivating magnesium powder；
2) top and bottom combined blown converter smelting molten steel is used, the weight percent of the raw material composition of investment metal major ingredient is that molten iron is
89%~92%, steel scrap uses light-duty steel scrap, enters furnace molten iron temperature >=1320 DEG C, the quality percentage of sulphur contains in molten iron chemical component
≤ 0.002% is measured, mass percentage≤0.020% of sulphur in light-duty steel scrap chemical component；
3) converter slag-making auxiliary material is added when converter oxygen gun leads to oxygen point fire and carries out slag making, converter slag-making auxiliary material be metallurgical quick lime,
Light dolomite, iron ore, wherein in metallurgical quick lime sulphur mass percentage≤0.030%, sulphur in light dolomite
Mass percentage≤0.035%, mass percentage≤0.020% of sulphur in iron ore；
4) converter steelmaking process controls, and control oxygen supply intensity is 2.5~3.5Nm3/ (mint), oxygen lance operation use oxygen pressure
Constant, oxygen lance position alternates mode of operation in benchmark rifle position, low rifle position and high rifle position, bessemerizes early period, controls oxygen blast
Amount is the 20%~30% of total oxygen blast mass percent, and control of lance position is added whole light dolomites, adds in high rifle position
Enter the 80% of metallurgical quick lime total amount, the 50%~70% of iron ore total amount is added；Mid-term is bessemerized, control of lance position is
Benchmark rifle position → low rifle position → high rifle position circulate operation, control blowing oxygen quantity are the 50%~70% of total oxygen blast mass percent, are added
Enter remaining whole iron ores and metallurgical quick lime；It bessemerizes the later period, control blowing oxygen quantity is the 10% of total oxygen blast mass percent
~20%, control of lance position is that first benchmark rifle position carries out slugging, and control blowing oxygen quantity is the 10% of total oxygen blast mass percent, it
Low rifle position carries out pressure slag, reinforces stirring afterwards；Bottom-blowing of converter argon flow is controlled in 0.05~0.08Nm3/ (mint), metallurgy are raw
The ton steel additional amount of lime is 36~80kg, and the ton steel additional amount of light dolomite is 8~18kg, the ton steel additional amount of iron ore
For 14~60kg；Converter oxygen gun benchmark rifle position is H0+H0* (0.12~0.18), high rifle position are H0+H0* (0.2~0.5), low rifle
Position is H0+H0* (0.05~0.10), H0For steel water surface elevation in converter；
5) converter smelting endpoint is handled, and bessemerizing carbon mass percentage in endpoint molten steel is 0.03%~0.06%, converter
End is bessemerized when blowing end point liquid steel temperature >=1650 DEG C, is tapped immediately after bessemerizing；
6) slag, dross are not splashed after converter tapping, clinker is all outwelled.
2. a kind of production method of super-low sulfur molten steel as described in claim 1, characterized in that in the light dolomite
Mass percentage >=25% of MgO, mass percentage >=58% of FeO in iron ore.
3. a kind of production method of super-low sulfur molten steel as described in claim 1, characterized in that the step 4) controls converter
MgO mass percentage is 6%~8% in smelting endpoint slag.
4. a kind of production method of super-low sulfur molten steel as described in claim 1, characterized in that the step 4) controls converter
Dual alkalinity is 3.0~5.0 in smelting endpoint slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610154622.9A CN107201421B (en) | 2016-03-17 | 2016-03-17 | A kind of production method of super-low sulfur molten steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610154622.9A CN107201421B (en) | 2016-03-17 | 2016-03-17 | A kind of production method of super-low sulfur molten steel |
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| CN107201421A CN107201421A (en) | 2017-09-26 |
| CN107201421B true CN107201421B (en) | 2019-04-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110042200A (en) * | 2019-04-09 | 2019-07-23 | 鞍钢股份有限公司 | A kind of smelting process of ultralow-sulfur steel |
| CN110205435B (en) * | 2019-06-04 | 2021-07-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for pretreating and desulfurizing molten iron in converter |
| CN110484687A (en) * | 2019-09-02 | 2019-11-22 | 安阳钢铁股份有限公司 | The production control method of ultralow limit sulphur in a kind of low-carbon low-phosphor clean steel |
| CN113025781B (en) * | 2021-02-08 | 2022-12-16 | 首钢集团有限公司 | Method for producing low-carbon low-silicon ultralow-sulfur steel by adopting LF (ladle furnace) single-link process |
| CN115652016A (en) * | 2022-09-30 | 2023-01-31 | 马鞍山钢铁股份有限公司 | Stable control method for smelting ultra-low sulfur steel by converter |
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| CN102134629B (en) * | 2010-12-30 | 2012-08-01 | 首钢总公司 | Smelting method for low-silicon ultralow-sulphur steel |
| JP2013133520A (en) * | 2011-12-27 | 2013-07-08 | Jfe Steel Corp | Method of dephosphorizing-refining molten iron |
| CN102443675B (en) * | 2011-12-28 | 2013-06-26 | 首钢总公司 | Production method of low-sulfur steel |
| CN104975138A (en) * | 2014-04-11 | 2015-10-14 | 上海梅山钢铁股份有限公司 | Method of preparing ultralow-sulfur molten iron through injection of molten iron pre-treatment composite desulfurizer |
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