CN105969932A - Steelmaking hydrogen control method - Google Patents
Steelmaking hydrogen control method Download PDFInfo
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- CN105969932A CN105969932A CN201610506127.XA CN201610506127A CN105969932A CN 105969932 A CN105969932 A CN 105969932A CN 201610506127 A CN201610506127 A CN 201610506127A CN 105969932 A CN105969932 A CN 105969932A
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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 steelmaking hydrogen control method. Through much test and data analysis, the hydrogen content of molten steel produced in each procedure is detected and analyzed, and the various factors which may increase hydrogen in the steelmaking process are summarized. By optimizing the quality and proportion of furnace charge of a converter, improving the endpoint carbon content of the converter, reducing use of water-containing materials, strictly controlling water leakage of a flue and an oxygen lance, carrying out alloy and protective slag baking, prolonging the slow cooling time of casting blanks and the like, the average hydrogen content in the steel is lowered by 2.04 ppm and becomes 4-6 ppm. The quality of the casting blanks is remarkably improved, the crack and flaw detection defects of the steel grade not subjected to vacuum treatment are greatly reduced, and the flow defection percent of pass of steel plates is improved to 99.3% from original 98.5%.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, especially relate to a kind of method made steel and control hydrogen.
Background technology
In iron and steel metallurgical industry, owing to Some Enterprises uses twin furnace two-shipper production organization mode, but only has a RH
Vacuum treatment device, necessarily causes part heat of molten steel to cannot be carried out application of vacuum, causes steel grade air inclusions content relatively
Height, wherein affects the most obvious with hydrogen content on the quality of molten steel.Under normal process, without vacuum treated molten steel hydrogen
Content can reach 7ppm～8ppm, and is only 1ppm～2ppm through vacuum treated molten steel hydrogen content.Without very
The molten steel of vacancy reason is higher due to hydrogen content, easily causes steel plate the defects such as white point, hydrogen embrittlement, steam bubble and crackle occur, sternly
May cause steel plate that the serious quality problems such as layering occur during weight, have a strong impact on the flaw detection qualification rate of steel plate.
Therefore, how in the case of cannot be carried out RH application of vacuum, it is current for efficiently reducing the hydrogen content in molten steel
Those skilled in the art need badly and solve the technical problem that.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of method made steel and control hydrogen, the method can cannot be carried out RH
In the case of application of vacuum, efficiently reduce the hydrogen content in molten steel, improve the up-to-standard rate of steel plate.
For solving above-mentioned technical problem, the technical scheme that the present invention provides is:
A kind of method controlling hydrogen of making steel, comprises the following steps:
1) it is dried steel scrap, controls the water content of steel scrap less than 5%；It is dried the auxiliary additive needed for steel-making, controls auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to sublance TSC measurement temperature is at 1590 DEG C～1610 DEG C, to avoid
Process temperature is too high, and TSC measurement does not add Ore cooling, and the CO produced by blowing later stage C-O reaction after terminating
Bubble promotes the discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%～0.11%, to avoid owing to terminal peroxidating causes hydrogen content liter in molten steel
Height, can reduce the addition of carburant in tapping process, it is to avoid owing to carburant causes molten steel hydrogenation simultaneously；
3) during optimizing tapping, alloy is with addition and the addition sequence pushing up slag: fluorite consumption is reduced to 0.45kg/
Ton steel～0.55kg/ ton steel, and with addition of 0.8kg/ ton steel～the slagging agent of 1.2kg/ ton steel, tap to first to steel when 1/4
The top slag for preparing in advance of addition in bag, adds alloy when tapping is to 1/3, control thickness of slag layer in ladle at 28mm～
32mm, with adsorbed gas field trash, accelerates the removal of protium in steel；
4) in, position feed bin alloy is pressed after stove weighed, and puts into baking bucket, utilizes self-produced coal gas of converter to toast, 200
20min～25min is toasted, to add ladle after removing the moisture in alloy at a temperature of DEG C；
Coverture is toasted with covering slag, utilizes self-produced steam for thermal source, use heating-installation type baking, and require baking
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening to 24 hours～26 hours, the baking time of tundish extended to 4 hours～5
Hour, to guarantee that the moisture in cylinder-packing is completely exhausted out, avoiding is rapidly heated simultaneously causes the damage of lining brick；
5) control the arc-covering slag operation in refining process, submerged arc slag consumption is brought up to 1.3kg/ ton steel～1.8kg/ ton
Steel, to reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, to increase air inclusions
Adsorption time, reduce hydrogen content in steel；
6) by strand slow cooling time lengthening 24 hours～26 hours, to promote that the diffusion of protium in steel escapes.
The invention provides a kind of method made steel and control hydrogen, by lot of experiments and data analysis, molten steel produced to each operation
Hydrogen content test analysis, summed up steelmaking process various may the factor of hydrogenation, enter furnace charge by optimizing converter
Quality and proportioning, raising endpoint carbon content of converter, reduce the use of water-containing materials, strict control flue and oxygen rifle leaks,
Carry out alloy, covering slag baking, extend the measures such as strand slow cooling time；Wherein kiln process controls and aim carbon control is
The control successful key condition of hydrogen, reduces converter terminal hydrogen content；Alloy, covering slag, coverture, ladle and centre
Bag baking is to avoid refine and the key means of casting cycle hydrogenation；Strand slow cooling is to reduce strand hydrogen content to plate quality
The important supplement of impact, is favorably improved steel plate inspection qualification rate；Make average hydrogen content in steel reduce 2.04ppm, make
Obtaining average hydrogen content in steel is 4ppm～6ppm, and slab quality significantly improves, and is greatly decreased without application of vacuum steel grade
Crackle and detection defects, steel plate inspection qualification rate is brought up to 99.3% by original 98.5%；And molten steel control hydrogen effect stability,
Hydrogen content fluctuation is less, and slab quality is the most stable；Method is workable, and later process can eliminate to greatest extent
The impact of last process, field control is workable；Implementation cost is low, utilizes steel-making waste heat baking, for steelmaker
The high efficiency, low cost steady production of sequence plays positive role.
Detailed description of the invention
In order to be further appreciated by the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should
Working as understanding, these descriptions simply further illustrate inventive feature and advantage rather than the limit to the claims in the present invention
System.
The invention provides a kind of method made steel and control hydrogen, comprise the following steps:
1) it is dried steel scrap, controls the water content of steel scrap less than 5%；It is dried the auxiliary additive needed for steel-making, controls auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to sublance TSC measurement temperature is at 1590 DEG C～1610 DEG C, to avoid
Process temperature is too high, and TSC measurement does not add Ore cooling, and the CO produced by blowing later stage C-O reaction after terminating
Bubble promotes the discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%～0.11%, to avoid owing to terminal peroxidating causes hydrogen content liter in molten steel
Height, can reduce the addition of carburant in tapping process, it is to avoid owing to carburant causes molten steel hydrogenation simultaneously；
3) during optimizing tapping, alloy is with addition and the addition sequence pushing up slag: fluorite consumption is reduced to 0.45kg/
Ton steel～0.55kg/ ton steel, and with addition of 0.8kg/ ton steel～the slagging agent of 1.2kg/ ton steel, tap to first to steel when 1/4
The top slag for preparing in advance of addition in bag, adds alloy when tapping is to 1/3, control thickness of slag layer in ladle at 28mm～
32mm, with adsorbed gas field trash, accelerates the removal of protium in steel；
4) in, position feed bin alloy is pressed after stove weighed, and puts into baking bucket, utilizes self-produced coal gas of converter to toast, 200
20min～25min is toasted, to add ladle after removing the moisture in alloy at a temperature of DEG C；
Coverture is toasted with covering slag, utilizes self-produced steam for thermal source, use heating-installation type baking, and require baking
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening to 24 hours～26 hours, the baking time of tundish extended to 4 hours～5
Hour, to guarantee that the moisture in cylinder-packing is completely exhausted out, avoiding is rapidly heated simultaneously causes the damage of lining brick；
5) control the arc-covering slag operation in refining process, submerged arc slag consumption is brought up to 1.3kg/ ton steel～1.8kg/ ton
Steel, to reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, to increase air inclusions
Adsorption time, reduce hydrogen content in steel；
6) by strand slow cooling time lengthening 24 hours～26 hours, to promote that the diffusion of protium in steel escapes.
Raw material that the present invention does not elaborates, method and device etc. are prior art.
In order to be further appreciated by the present invention, a kind of method making steel control hydrogen provided the present invention below in conjunction with embodiment is carried out
Describing in detail, protection scope of the present invention is not limited by the following examples.
Embodiment 1
A kind of method controlling hydrogen of making steel, comprises the following steps:
1) it is dried steel scrap, controls the water content of steel scrap less than 5%；It is dried the auxiliary additive needed for steel-making, controls auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to sublance TSC measurement temperature is at 1590 DEG C, to avoid process temperature
Too high, TSC measurement does not add Ore cooling after terminating, and the CO bubble produced by blowing later stage C-O reaction is promoted
The discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.11%, to avoid owing to terminal peroxidating causes hydrogen content in molten steel to raise, simultaneously
The addition of carburant in tapping process can be reduced, it is to avoid owing to carburant causes molten steel hydrogenation；
3) during optimizing tapping, alloy is with addition and the addition sequence pushing up slag: fluorite consumption is reduced to 0.45kg/
Ton steel, and with addition of the slagging agent of 1.2kg/ ton steel, tap to when 1/4 and first in ladle, add the top slag prepared in advance, go out
Adding alloy when steel is to 1/3, the thickness of slag layer in control ladle is at 28mm, with adsorbed gas field trash, accelerates in steel
The removal of protium；
4) in, position feed bin alloy is pressed after stove weighed, and puts into baking bucket, utilizes self-produced coal gas of converter to toast, 200
25min is toasted, to add ladle after removing the moisture in alloy at a temperature of DEG C；
Coverture is toasted with covering slag, utilizes self-produced steam for thermal source, use heating-installation type baking, and require baking
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening to 24 hours, the baking time of tundish extended to 5 hours, to guarantee bag
Moisture in lining is completely exhausted out, and avoiding is rapidly heated simultaneously causes the damage of lining brick；
5) control the arc-covering slag operation in refining process, submerged arc slag consumption is brought up to 1.3kg/ ton steel, to reduce conjunction
Gold and the addition of slag material, by weak time lengthening of stirring to 13min, to increase the adsorption time of air inclusions, reduce
Hydrogen content in steel；
6) by strand slow cooling time lengthening 26 hours, to promote that the diffusion of protium in steel escapes.
In the present embodiment gained molten steel, average hydrogen content is 4.05ppm.
Embodiment 2
1) it is dried steel scrap, controls the water content of steel scrap less than 5%；It is dried the auxiliary additive needed for steel-making, controls auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to sublance TSC measurement temperature is at 1610 DEG C, to avoid process temperature
Too high, TSC measurement does not add Ore cooling after terminating, and the CO bubble produced by blowing later stage C-O reaction is promoted
The discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%, to avoid owing to terminal peroxidating causes hydrogen content in molten steel to raise, simultaneously
The addition of carburant in tapping process can be reduced, it is to avoid owing to carburant causes molten steel hydrogenation；
3) during optimizing tapping, alloy is with addition and the addition sequence pushing up slag: fluorite consumption is reduced to 0.55kg/
Ton steel, and with addition of the slagging agent of 0.8kg/ ton steel, tap to when 1/4 and first in ladle, add the top slag prepared in advance,
Adding alloy when tapping is to 1/3, the thickness of slag layer in control ladle is at 32mm, with adsorbed gas field trash, accelerates
The removal of protium in steel；
4) in, position feed bin alloy is pressed after stove weighed, and puts into baking bucket, utilizes self-produced coal gas of converter to toast, 200
20min is toasted, to add ladle after removing the moisture in alloy at a temperature of DEG C；
Coverture is toasted with covering slag, utilizes self-produced steam for thermal source, use heating-installation type baking, and require baking
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening to 26 hours, the baking time of tundish extended to 4 hours, to guarantee bag
Moisture in lining is completely exhausted out, and avoiding is rapidly heated simultaneously causes the damage of lining brick；
5) control the arc-covering slag operation in refining process, submerged arc slag consumption is brought up to 1.8kg/ ton steel, to reduce conjunction
Gold and the addition of slag material, by weak time lengthening of stirring to 15min, to increase the adsorption time of air inclusions, reduce
Hydrogen content in steel；
6) by strand slow cooling time lengthening 24 hours, to promote that the diffusion of protium in steel escapes.
In the present embodiment gained molten steel, average hydrogen content is 5.15ppm.
The explanation of above example is only intended to help to understand method and the core concept thereof of the present invention.It should be pointed out that, for
For those skilled in the art, under the premise without departing from the principles of the invention, it is also possible to the present invention is carried out
Some improvement and modification, these improve and modify in the protection domain also falling into the claims in the present invention.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.Right
Multiple amendment in these embodiments is apparent from for those skilled in the art, defined herein one
As principle can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, this
The bright the embodiments shown herein that is not intended to be limited to, and be to fit to and principles disclosed herein and features of novelty
Consistent widest range.
Claims (1)
1. one kind make steel control hydrogen method, it is characterised in that comprise the following steps:
1) it is dried steel scrap, controls the water content of steel scrap less than 5%；It is dried the auxiliary additive needed for steel-making, controls auxiliary
The water content of additive is less than 5%；
2) process temperature of converter smelting is controlled, it is desirable to sublance TSC measurement temperature is at 1590 DEG C～1610 DEG C, to avoid
Process temperature is too high, and TSC measurement does not add Ore cooling, and the CO produced by blowing later stage C-O reaction after terminating
Bubble promotes the discharge of protium in molten steel；
Converter terminal carbon is brought up to 0.09%～0.11%, to avoid owing to terminal peroxidating causes hydrogen content liter in molten steel
Height, can reduce the addition of carburant in tapping process, it is to avoid owing to carburant causes molten steel hydrogenation simultaneously；
3) during optimizing tapping, alloy is with addition and the addition sequence pushing up slag: fluorite consumption is reduced to 0.45kg/
Ton steel～0.55kg/ ton steel, and with addition of 0.8kg/ ton steel～the slagging agent of 1.2kg/ ton steel, tap to first to steel when 1/4
The top slag for preparing in advance of addition in bag, adds alloy when tapping is to 1/3, control thickness of slag layer in ladle at 28mm～
32mm, with adsorbed gas field trash, accelerates the removal of protium in steel；
4) in, position feed bin alloy is pressed after stove weighed, and puts into baking bucket, utilizes self-produced coal gas of converter to toast, 200
20min～25min is toasted, to add ladle after removing the moisture in alloy at a temperature of DEG C；
Coverture is toasted with covering slag, utilizes self-produced steam for thermal source, use heating-installation type baking, and require baking
Time is more than 8 hours, aqueous to reduce coverture and covering slag；
By ladle low-temperature bake time lengthening to 24 hours～26 hours, the baking time of tundish extended to 4 hours～5
Hour, to guarantee that the moisture in cylinder-packing is completely exhausted out, avoiding is rapidly heated simultaneously causes the damage of lining brick；
5) control the arc-covering slag operation in refining process, submerged arc slag consumption is brought up to 1.3kg/ ton steel～1.8kg/ ton
Steel, to reduce the addition of alloy and slag material, by weak time lengthening of stirring to more than 10min, to increase air inclusions
Adsorption time, reduce hydrogen content in steel；
6) by strand slow cooling time lengthening 24 hours～26 hours, to promote that the diffusion of protium in steel escapes.
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| CN201610506127.XA CN105969932B (en) | 2016-06-30 | 2016-06-30 | A kind of method for making steel control hydrogen |
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| CN201610506127.XA CN105969932B (en) | 2016-06-30 | 2016-06-30 | A kind of method for making steel control hydrogen |
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| CN105969932B CN105969932B (en) | 2018-04-06 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115125367A (en) * | 2022-06-20 | 2022-09-30 | 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) |
| CN117305536A (en) * | 2023-09-28 | 2023-12-29 | 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN115125367A (en) * | 2022-06-20 | 2022-09-30 | 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) |
| CN117305536A (en) * | 2023-09-28 | 2023-12-29 | 河北普阳钢铁有限公司 | Method for producing ultralow hydrogen content steel under non-vacuum condition |
| 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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|---|---|
| CN105969932B (en) | 2018-04-06 |
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