CN105969932B - A kind of method for making steel control hydrogen - Google Patents
A kind of method for making steel control hydrogen Download PDFInfo
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- CN105969932B CN105969932B CN201610506127.XA CN201610506127A CN105969932B CN 105969932 B CN105969932 B CN 105969932B CN 201610506127 A CN201610506127 A CN 201610506127A CN 105969932 B CN105969932 B CN 105969932B
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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
-
- 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
-
- 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)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a kind of method for making steel control hydrogen; pass through lot of experiments and data analysis; the hydrogen content that molten steel is produced to each operation is tested analysis; the factor of the various possible hydrogenations of steelmaking process has been summed up, quality and the measure such as proportioning, raising endpoint carbon content of converter, the strictly use of reduction water-containing materials, control flue and oxygen rifle leak, progress alloy, covering slag baking, extension strand temperature retention time of furnace charge are entered by optimizing converter；So that average hydrogen content reduces 2.04ppm in steel, so that average hydrogen content is 4ppm~6ppm in steel, slab quality significantly improves, and crackle and detection defects without application of vacuum steel grade is greatly decreased, and steel plate inspection qualification rate brings up to 99.3% by original 98.5%.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly, to a kind of method made steel and control hydrogen.
Background technology
In iron and steel metallurgical industry, because Some Enterprises use twin furnace two-shipper production organization mode, but an only RH
Vacuum treatment device, necessarily cause part heat of molten steel can not carry out application of vacuum, cause steel grade air inclusions content higher,
Wherein the quality of molten steel is influenceed with hydrogen content the most obvious.Under normal process, without the molten steel hydrogen content energy of application of vacuum
Enough reach 7ppm~8ppm, and the molten steel hydrogen content Jing Guo application of vacuum is only 1ppm~2ppm.Without the steel of application of vacuum
Water easily causes steel plate the defects of white point, hydrogen embrittlement, steam bubble and crackle occur because hydrogen content is higher, and steel may be caused when serious
Such as there are being layered at the serious quality problems in plate, has had a strong impact on the flaw detection qualification rate of steel plate.
Therefore, how in the case where that can not carry out RH application of vacuum, it is current to efficiently reduce the hydrogen content in molten steel
The technical problem of those skilled in the art's urgent need to resolve.
The content of the invention
In view of this, it is an object of the invention to provide a kind of method for making steel control hydrogen, this method can not carry out RH
In the case of application of vacuum, the hydrogen content in molten steel is efficiently reduced, improves the up-to-standard rate of steel plate.
To solve above-mentioned technical problem, technical scheme provided by the invention is：
A kind of method for making steel control hydrogen, comprises the following steps：
1) steel scrap is dried, controls the water content of steel scrap to be less than 5%；Dry the auxiliary additive needed for steel-making, control auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to which sublance TSC measurement temperatures are at 1590 DEG C~1610 DEG C, to avoid
Cheng Wendu is too high, and TSC measurements do not add ore cooling after terminating, and are promoted by the CO bubbles caused by later stage C-O reactions that blow
Enter the discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%~0.11%, to avoid because terminal peroxidating causes hydrogen content in molten steel
Rise, while the addition of carburant in tapping process can be reduced, avoid because carburant causes molten steel hydrogenation；
3) addition and addition sequence of alloy and top slag during optimization tapping：Fluorite dosage is reduced to 0.45kg/
Ton steel~0.55kg/ ton steel, and with addition of the slagging agent of 0.8kg/ tons steel~1.2kg/ ton steel, tap to when 1/4 first into ladle
The top slag for preparing in advance is added, alloy is added when tapping to 1/3, controls thickness of slag layer in ladle in 28mm~32mm, with
Adsorbed gas field trash, accelerate the removal of protium in steel；
4) after middle position feed bin alloy has been weighed by stove, baking bucket is put into, is toasted using self-produced coal gas of converter, 200
20min~25min is toasted at a temperature of DEG C, to add ladle after removing the moisture in alloy；
Coverture and covering slag are toasted, is thermal source using self-produced steam, is toasted using heating-installation type, and require to toast
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening by 24 hours~26 hours, the baking time of tundish extends to 4 hours~5
Hour, it is completely exhausted out with the moisture ensured in cylinder-packing, while avoid being rapidly heated and cause the damage of lining brick；
5) arc-covering slag operation in refining process is controlled, submerged arc slag dosage is brought up into 1.3kg/ tons steel~1.8kg/ tons
Steel, to reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, to increase the suction of air inclusions
The attached time, reduce hydrogen content in steel；
6) strand temperature retention time is extended 24 hours~26 hours, to promote the diffusion of protium in steel to escape.
The invention provides a kind of method for making steel control hydrogen, by lot of experiments and data analysis, steel is produced to each operation
The hydrogen content of water is tested analysis, has been summed up the factor of the various possible hydrogenations of steelmaking process, has been entered furnace charge by optimizing converter
Quality and proportioning, the use for improving endpoint carbon content of converter, reducing water-containing materials, strict control flue and oxygen rifle leak, enter
Row alloy, covering slag baking, extend the measures such as strand temperature retention time；Wherein kiln process control and aim carbon control be control hydrogen into
The key condition of work(, reduce converter terminal hydrogen content；Alloy, covering slag, coverture, ladle and baking of tundish are to avoid
Refining and the key means of casting cycle hydrogenation；Strand slow cooling is to reduce the important benefit that strand hydrogen content influences on plate quality
Fill, be favorably improved steel plate inspection qualification rate；So that average hydrogen content reduces 2.04ppm in steel so that average hydrogen content in steel
For 4ppm~6ppm, slab quality significantly improves, and crackle and detection defects without application of vacuum steel grade, steel plate is greatly decreased
Flaw detection qualification rate brings up to 99.3% by original 98.5%；And molten steel control hydrogen effect stability, hydrogen content fluctuate smaller, strand matter
Amount is relatively stable；Method is workable, and later process can eliminate the influence of last process to greatest extent, and field control can
Strong operability；Implementation cost is low, using waste heat baking is made steel, is played actively for the high efficiency, low cost steady production of steel making working procedure
Effect.
Embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, still
It should be appreciated that these descriptions simply further illustrate the feature and advantage of the present invention, rather than the limit to the claims in the present invention
System.
The invention provides a kind of method for making steel control hydrogen, comprise the following steps：
1) steel scrap is dried, controls the water content of steel scrap to be less than 5%；Dry the auxiliary additive needed for steel-making, control auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to which sublance TSC measurement temperatures are at 1590 DEG C~1610 DEG C, to avoid
Cheng Wendu is too high, and TSC measurements do not add ore cooling after terminating, and are promoted by the CO bubbles caused by later stage C-O reactions that blow
Enter the discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%~0.11%, to avoid because terminal peroxidating causes hydrogen content in molten steel
Rise, while the addition of carburant in tapping process can be reduced, avoid because carburant causes molten steel hydrogenation；
3) addition and addition sequence of alloy and top slag during optimization tapping：Fluorite dosage is reduced to 0.45kg/
Ton steel~0.55kg/ ton steel, and with addition of the slagging agent of 0.8kg/ tons steel~1.2kg/ ton steel, tap to when 1/4 first into ladle
The top slag for preparing in advance is added, alloy is added when tapping to 1/3, controls thickness of slag layer in ladle in 28mm~32mm, with
Adsorbed gas field trash, accelerate the removal of protium in steel；
4) after middle position feed bin alloy has been weighed by stove, baking bucket is put into, is toasted using self-produced coal gas of converter, 200
20min~25min is toasted at a temperature of DEG C, to add ladle after removing the moisture in alloy；
Coverture and covering slag are toasted, is thermal source using self-produced steam, is toasted using heating-installation type, and require to toast
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening by 24 hours~26 hours, the baking time of tundish extends to 4 hours~5
Hour, it is completely exhausted out with the moisture ensured in cylinder-packing, while avoid being rapidly heated and cause the damage of lining brick；
5) arc-covering slag operation in refining process is controlled, submerged arc slag dosage is brought up into 1.3kg/ tons steel~1.8kg/ tons
Steel, to reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, to increase the suction of air inclusions
The attached time, reduce hydrogen content in steel；
6) strand temperature retention time is extended 24 hours~26 hours, to promote the diffusion of protium in steel to escape.
Raw material that the present invention does not elaborate, method and device etc. are prior art.
For a further understanding of the present invention, a kind of method for making steel control hydrogen provided by the invention is entered with reference to embodiment
Row is described in detail, and protection scope of the present invention is not limited by the following examples.
Embodiment 1
A kind of method for making steel control hydrogen, comprises the following steps：
1) steel scrap is dried, controls the water content of steel scrap to be less than 5%；Dry the auxiliary additive needed for steel-making, control auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to which sublance TSC measurement temperatures are at 1590 DEG C, to avoid process temperature mistake
Height, TSC measurements do not add ore cooling after terminating, and are promoted by the CO bubbles caused by later stage C-O reactions that blow in molten steel
The discharge of protium；
Converter terminal carbon is brought up to 0.11%, to avoid because terminal peroxidating causes hydrogen content in molten steel to raise, together
When can reduce the addition of carburant in tapping process, avoid because carburant causes molten steel hydrogenation；
3) addition and addition sequence of alloy and top slag during optimization tapping：Fluorite dosage is reduced to 0.45kg/
Ton steel, and with addition of the slagging agent of 1.2kg/ ton steel, the top slag for first adding into ladle during to 1/4 and preparing in advance of tapping, tapping is extremely
Add alloy when 1/3, control thickness of slag layer in ladle with adsorbed gas field trash, to accelerate protium in steel in 28mm
Remove；
4) after middle position feed bin alloy has been weighed by stove, baking bucket is put into, is toasted using self-produced coal gas of converter, 200
25min is toasted at a temperature of DEG C, to add ladle after removing the moisture in alloy；
Coverture and covering slag are toasted, is thermal source using self-produced steam, is toasted using heating-installation type, and require to toast
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening by 24 hours, the baking time of tundish extends to 5 hours, to ensure cylinder-packing
In moisture be completely exhausted out, while avoid being rapidly heated and cause the damage of lining brick；
5) arc-covering slag operation in refining process is controlled, submerged arc slag dosage is brought up into 1.3kg/ ton steel, is closed with reducing
The addition of gold and slag material, by weak time lengthening of stirring to 13min, to increase the adsorption time of air inclusions, reduce in steel
Hydrogen content；
6) strand temperature retention time is extended 26 hours, to promote the diffusion of protium in steel to escape.
Average hydrogen content is 4.05ppm in molten steel obtained by the present embodiment.
Embodiment 2
1) steel scrap is dried, controls the water content of steel scrap to be less than 5%；Dry the auxiliary additive needed for steel-making, control auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to which sublance TSC measurement temperatures are at 1610 DEG C, to avoid process temperature mistake
Height, TSC measurements do not add ore cooling after terminating, and are promoted by the CO bubbles caused by later stage C-O reactions that blow in molten steel
The discharge of protium；
Converter terminal carbon is brought up to 0.09%, to avoid because terminal peroxidating causes hydrogen content in molten steel to raise, together
When can reduce the addition of carburant in tapping process, avoid because carburant causes molten steel hydrogenation；
3) addition and addition sequence of alloy and top slag during optimization tapping：Fluorite dosage is reduced to 0.55kg/
Ton steel, and with addition of the slagging agent of 0.8kg/ ton steel, the top slag for first adding into ladle during to 1/4 and preparing in advance of tapping, tapping is extremely
Add alloy when 1/3, control thickness of slag layer in ladle with adsorbed gas field trash, to accelerate protium in steel in 32mm
Remove；
4) after middle position feed bin alloy has been weighed by stove, baking bucket is put into, is toasted using self-produced coal gas of converter, 200
20min is toasted at a temperature of DEG C, to add ladle after removing the moisture in alloy；
Coverture and covering slag are toasted, is thermal source using self-produced steam, is toasted using heating-installation type, and require to toast
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening by 26 hours, the baking time of tundish extends to 4 hours, to ensure cylinder-packing
In moisture be completely exhausted out, while avoid being rapidly heated and cause the damage of lining brick；
5) arc-covering slag operation in refining process is controlled, submerged arc slag dosage is brought up into 1.8kg/ ton steel, is closed with reducing
The addition of gold and slag material, by weak time lengthening of stirring to 15min, to increase the adsorption time of air inclusions, reduce in steel
Hydrogen content；
6) strand temperature retention time is extended 24 hours, to promote the diffusion of protium in steel to escape.
Average hydrogen content is 5.15ppm in molten steel obtained by the present embodiment.
The explanation of above example is only intended to help the method and its core concept for understanding the present invention.It should be pointed out that pair
For those skilled in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out
Some improvement and modification, these are improved and modification is also fallen into the protection domain of the claims in the present invention.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications for these embodiments are it will be apparent that defined herein one for those skilled in the art
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, the present invention will
It will not be intended to be limited to the embodiments shown herein, and be to fit to consistent with principles disclosed herein and features of novelty
Widest range.
Claims (1)
- A kind of 1. method for making steel control hydrogen, it is characterised in that comprise the following steps：1) steel scrap is dried, controls the water content of steel scrap to be less than 5%；Dry the auxiliary additive needed for steel-making, control auxiliary addition The water content of agent is less than 5%；2) process temperature of converter smelting is controlled, it is desirable to which sublance TSC measurement temperatures are at 1590 DEG C~1610 DEG C, to avoid process temperature Height is spent, TSC measurements do not add ore cooling after terminating, and promote steel by the CO bubbles caused by later stage C-O reactions that blow The discharge of protium in water；Converter terminal carbon is brought up to 0.09%~0.11%, to avoid because terminal peroxidating causes hydrogen content liter in molten steel Height, while the addition of carburant in tapping process can be reduced, avoid because carburant causes molten steel hydrogenation；3) addition and addition sequence of alloy and top slag during optimization tapping：Fluorite dosage is reduced to 0.45kg/ ton steel ~0.55kg/ ton steel, and with addition of the slagging agent of 0.8kg/ tons steel~1.2kg/ ton steel, tap to first being added when 1/4 into ladle The top slag prepared in advance, adds alloy when tapping to 1/3, thickness of slag layer in ladle is controlled in 28mm~32mm, with absorption Air inclusions, accelerate the removal of protium in steel；4) after middle position feed bin alloy has been weighed by stove, baking bucket is put into, is toasted using self-produced coal gas of converter, at 200 DEG C At a temperature of toast 20min~25min, to add ladle after removing the moisture in alloy；Coverture and covering slag are toasted, is thermal source using self-produced steam, is toasted using heating-installation type, and require baking time It is aqueous to reduce coverture and covering slag more than 8 hours；By ladle low-temperature bake time lengthening by 24 hours~26 hours, it is small that the baking time of tundish extends to 4 hours~5 When, it is completely exhausted out with the moisture ensured in cylinder-packing, while avoid being rapidly heated and cause the damage of lining brick；5) arc-covering slag operation in refining process is controlled, submerged arc slag dosage is brought up into 1.3kg/ tons steel~1.8kg/ ton steel, To reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, during increasing the absorption of air inclusions Between, reduce hydrogen content in steel；6) strand temperature retention time is extended 24 hours~26 hours, to promote the diffusion of protium in steel to escape.
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Families Citing this family (7)
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| CN111020102A (en) * | 2019-12-25 | 2020-04-17 | 芜湖新兴铸管有限责任公司 | Molten steel hydrogen content control method |
| CN111996334A (en) * | 2020-07-06 | 2020-11-27 | 山东钢铁股份有限公司 | Full-flow program-controlled nitrogen method for electric furnace steelmaking |
| CN112831625A (en) * | 2021-01-04 | 2021-05-25 | 南京钢铁股份有限公司 | Smelting process for controlling hydrogen content of molten steel of non-vacuum steel |
| CN113881829A (en) * | 2021-09-10 | 2022-01-04 | 北京科技大学 | Treatment method for reducing hydrogen content of steel |
| CN115125367B (en) * | 2022-06-20 | 2023-05-02 | 河北普阳钢铁有限公司 | Production method for reducing H content in bridge steel without vacuum refining |
| CN115927781A (en) * | 2022-12-08 | 2023-04-07 | 鞍钢股份有限公司 | Method for controlling hydrogen content of high-carbon steel produced by single LF (ladle furnace) |
| CN117305536B (en) * | 2023-09-28 | 2024-06-07 | 河北普阳钢铁有限公司 | Method for producing ultralow hydrogen content steel under non-vacuum condition |
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| CN1030793A (en) * | 1987-07-17 | 1989-02-01 | 东北工学院 | Dehydrogenation method of molten steel and blowing device |
| JPH0645818B2 (en) * | 1988-02-26 | 1994-06-15 | 住友金属工業株式会社 | Bearing steel manufacturing method |
| CN101418366B (en) * | 2007-10-25 | 2010-12-01 | 宝山钢铁股份有限公司 | Top and bottom combined blown dehydrogenation method of refined-smelting ladle furnace |
| CN103484685B (en) * | 2012-06-11 | 2016-06-29 | 宝钢特钢有限公司 | A kind of electric slag refusion and smelting molten steel hydrogen content control method |
| CN103361460B (en) * | 2012-12-18 | 2014-12-31 | 莱芜钢铁集团有限公司 | Production method for effectively controlling gas content in beam blank |
| CN103642976B (en) * | 2013-11-22 | 2015-08-19 | 中原特钢股份有限公司 | A kind of smelting technology of H13 steel |
| CN104762434B (en) * | 2015-03-31 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of production method of anti-hydrogen induced cracking steel |
| CN105441636A (en) * | 2015-11-16 | 2016-03-30 | 山东钢铁股份有限公司 | Method for controlling added hydrogen in steelmaking process |
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