CN108893576A - The smelting process of welding rod steel H08A - Google Patents
The smelting process of welding rod steel H08A Download PDFInfo
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- CN108893576A CN108893576A CN201810814212.1A CN201810814212A CN108893576A CN 108893576 A CN108893576 A CN 108893576A CN 201810814212 A CN201810814212 A CN 201810814212A CN 108893576 A CN108893576 A CN 108893576A
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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
- C21C7/076—Use of slags or fluxes as treating agents
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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
- C21C7/0006—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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention relates to the smelting processes of welding rod steel H08A, belong to technical field of ferrous metallurgy.Present invention solves the technical problem that being that the continuous casting time is short in the production process of welding rod steel H08A and slab air blister defect is obvious.The technical solution of the present invention is to provide the smelting process of welding rod steel H08A, including converter smelting, LF refining, continuous casting, it is CaO, CaC that main component is added in LF refining2Slag foaming agent and main component be Al, Al2O3, CaO slag modifier for refining diffusive deoxidation, control molten steel oxygen activity be 0.0020%~0.0040%, Als content be 0.001%~0.005%, and it is 0.02%~0.03% that ferrosilicon, which is added, and controls Si content, then carries out Calcium treatment.The present invention by formulating reasonable molten steel control system, can steady and continuous production without internal flaw welding rod steel H08A continuous casting billet.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, and in particular to the smelting process of welding rod steel H08A.
Background technique
H08A welding rod steel is important the raw material of welding rod production, belongs to the steel grade of low-carbon, low silicon, low aluminium, with other steel
Kind one of maximum difference make sure that the chemical component of finished steel, component requirements Si≤0.03%, C≤0.08%,
Al≤0.005%.It needs to be added deoxidier in the production process of H08A welding rod steel and carries out deoxidation, generally using aluminium as deoxidation
Agent, and the addition of deoxidier can generate a large amount of field trashes is easy blocking middle water containing opening, influences the castability and continuous casting of molten steel
Direct motion, since deoxidation is bad, causes slab to generate bubble but if deoxidier is insufficient.Thus, production H08A welding rod steel needs to make
Fixed reasonable molten steel control system, will especially take into account the control of bubble and castability.
Patent CN104480250A discloses a kind of process of efficient deoxidation of welding rod steel, mainly by centre
Metallic aluminium is first placed in packet, refined molten steel injection tundish is then subjected to deoxidation, however generation is largely mingled with by this method
Object stays in molten steel, is difficult to remove, and influences pourability of molten steel.Patent CN1566370A discloses a kind of continuous casting carbon welding steel rod
Aluminium manganese iron pre-deoxidation is added by converter tapping in production method in ladle, and then refining determines oxygen online, feeds aluminum steel or aluminium
Grain, accurate to adjust molten steel oxygen activity, which only leans on aluminum steel or ferro-aluminum carries out direct deoxidation, can generate in molten steel a large amount of
Aluminate, and the type impurity is the main substance for blocking submersed nozzle, therefore is be easy to cause using this method
Nozzle blocking.Patent CN1455004A discloses a kind of ultra low silicon welding rod steel continuous casting production process, in deoxidation alloying process
In, following deoxidier is added by molten steel total amount：Calcium carbide, ferro-titanium and calcium-silicon etc. are added into steel ladle, to converter
Interior addition aluminum-manganese-iron alloy, the patent are all added by the way that deoxidier is added in batches although avoiding deoxidier to a certain extent
Enter bring negative effect, but being monitored to oxygen activity, however it remains the problem of bubble and castability.
Summary of the invention
Present invention solves the technical problem that being that the continuous casting time is short in the production process of welding rod steel H08A and slab bubble lacks
It falls into obvious.
The technical solution that the present invention solves above-mentioned technical problem is to provide the smelting process of welding rod steel H08A, and step includes turning
Furnace smelting, LF refining, continuous casting, it is characterised in that：
A. when the endpoint molten steel carbon content of converter smelting is 0.04%~0.05%, aluminium is added in slag-stopping tapping, tapping process
Ferroalloy pre-deoxidation controls oxygen activity 0.005%~0.010%；
Slag foaming agent and slag modifier for refining deoxidation, oxygen activity after control molten steel LF heating is added in b.LF refining process
It is 0.001%~0.005% for 0.0020%~0.0040%, Als content, it is 0.02% that Antaciron control Si content, which is added,
~0.03%, Calcium treatment is then carried out, the slag foaming agent is that main component is CaO, CaC2Mixture, the refining adjusts
Slag agent is that main component is Al, Al2O3, CaO mixture, wherein Als refers to the Al being dissolved in molten steel.
Wherein, alfer at least meets one in following：
The composition of alfer is calculated in mass percent as 40%Al, 58%Fe, and remaining is impurity；
Alfer additional amount is 3~4kg/t steel.
Wherein, slag-stopping tapping uses slide plate pushing off the slag, the control of the lower quantity of slag in 4~6kg/ tons of steel, 1650 DEG C of tapping temperature~
1680℃。
Wherein, slag foaming agent at least meets one in following：
Slag foaming agent is calculated in mass percent the CaC of the CaO including 60%~80%, 20%~40%2；Slag foaming
The additional amount of agent is 1~3kg/t steel；
Wherein, slag modifier for refining at least meets one in following：
Slag modifier for refining is calculated in mass percent the Al of the Al including 5%~10%, 60%~70%2O3, 25%~35%
CaO；
The additional amount of slag modifier for refining is 1~3kg/t steel.
Wherein, the slag foaming agent and slag modifier for refining are added after molten steel reaches LF processing station by high hopper
Enter.
Wherein, Antaciron at least meets one in following：
The composition of Antaciron is calculated in mass percent as 75%Si, 23%Fe, and remaining is impurity；
The additional amount of Antaciron is 0.4~0.6kg/ tons of steel；
Antaciron is added in molten steel in the outbound preceding 10~12min of LF.
Wherein, Calcium treatment is that iron calcium line is added, and specification 200g/m, additional amount is 2~5m/t steel, and at least under satisfaction
One in column：
The diameter of iron calcium line is 10mm；
The ingredient of iron calcium line is calculated in mass percent the Ca of the Fe and 20%~30% including 70%~80%；
Iron calcium line 8min~10min before LF is outbound is added, and adds in 2min, blowing argon gas 5min or more after addition.
Wherein, control refines outlet temperature at 1580 DEG C~1595 DEG C after Calcium treatment.
Wherein, the continuous casting process carries out continuous casting using 160mm × 160mm or 200mm × 200mm section, and pulling rate is
1.5~2.0m/min.
The beneficial effects of the invention are as follows：
The present invention is added in combination slag foaming agent and slag modifier for refining in LF refining, with higher in actual production
Controllability reduces production difficulty；Slag foaming agent and slag modifier for refining is added in the ladle top of the slag in the present invention, de- using diffusion
The mode of oxygen carries out deoxidation, and deoxidation products stays in slag, and molten steel will not be mingled with because of deoxidation；The present invention is in strict control oxygen
Calcium treatment is carried out on the basis of activity, substantially improves the castability of molten steel；Using method of the invention, molten steel even pours the time can
To reach 500min or more, and gained slab is almost without air blister defect.
Specific embodiment
Calcium treatment can be controlled it and be in a liquid state at a temperature of steel-making continuous casting, be conducive to by the form of change aluminium deoxidation product
The inclusion floating of aluminium improves castability, however if oxygen activity controls improper, oxygen easy to form to avoid the blocking mouth of a river
Change calcium, cannot not only improve pourability of molten steel, easily cause nozzle blocking instead.Therefore, when using Calcium treatment, it is necessary to steady
Surely molten steel oxygen activity is controlled.Meanwhile to solve slab air blister defect, present invention firstly provides pass through in welding rod steel H08A steel
The method for controlling Si and Als content to control air blister defect.By formulating reasonable molten steel control system, the present invention can stablize company
Continuous production is without internal flaw welding rod steel H08A continuous casting billet.
On the other hand, although slag foaming agent and slag modifier for refining can be diffused deoxidation in LF refining process,
Practice operation in, for slag foaming agent, since heating process electrode carburetting is unstable, when heated between it is long, then may be used
, there is the case where carbon content is more than the steel grade upper limit in energy carburetting 0.03%~0.04%；For slag modifier for refining, when a large amount of aluminium enter
In molten steel, leading to Als in molten steel is more than 0.005%, and oxygen activity is lower than 0.0020%, and such case Calcium treatment again will lead to water
Mouth blocking, it is disconnected to pour, while as Als content is exceeded and scraps.
The present invention provides the smelting process of welding rod steel H08A, and step includes converter smelting, LF refining, continuous casting, specifically：
A. when the endpoint molten steel carbon content of converter smelting is 0.04%~0.05%, aluminium is added in slag-stopping tapping, tapping process
Ferroalloy pre-deoxidation controls oxygen activity 0.005%~0.010%；
Slag foaming agent and slag modifier for refining deoxidation, oxygen activity after control molten steel LF heating is added in b.LF refining process
It is 0.001%~0.005% for 0.0020%~0.0040%, Als content, it is 0.02% that Antaciron control Si content, which is added,
~0.03%, Calcium treatment is then carried out, the slag foaming agent is that main component is CaO, CaC2Mixture, wherein Als be
Refer to the Al being dissolved in molten steel.
Found by lot of experiment validation, when in oxygen activity > 0.0040%, continuous casting process as temperature reduces, continuous meeting
There is oxygen bubble to be precipitated in crystallizer, forms a large amount of air blister defects；As oxygen activity < 0.0020%, pass through the chemistry of aluminium and oxygen
Balance is it is found that Al, that is, Als in molten steel can be higher, but as continuous casting process temperature reduces, in continuous casting, have a large amount of Al and
Oxygen combines and forms Al2O3, this part Al2O3It is formed in continuous casting sprue, the mouth of a river will be blocked, continuous casting is caused to terminate.
The present invention controls air blister defect, Si≤0.01% in molten steel, the company produced by control Si and Als content
Slab will appear bubble, and Si content is lower, then bubble is more, and Al is the key that control oxygen activity and calcium treatment effect member
Element, there are a balances for Al and oxygen activity in molten steel, and by verification experimental verification, Als is controlled in 0.001%~0.005% range, oxygen
Activity can be stablized in the range of 0.0020%~0.0040%, and exceed the range, and oxygen activity will appear excessively high or too low.
Alfer pre-deoxidation is added to ladle in converter tapping process in the present invention, oxygen activity is reduced to 0.005%~
0.010%, it, can be by oxygen activity stability contorting 0.0020% then by LF slag foaming agent and slag modifier for refining diffusive deoxidation
In~0.0040% range.
Wherein, slag-stopping tapping uses slide plate pushing off the slag, the control of the lower quantity of slag in 4~6kg/ tons of steel, 1650 DEG C of tapping temperature~
1680℃。
Wherein, the slag foaming agent is calculated in mass percent the CaO including 60%~80%, 20%~40%
CaC2, additional amount is 1~3kg/t steel.Slag foaming agent additional amount is excessive, and calcium carbide is decomposed into calcium oxide and carbon dust, carbon dust into
Molten steel carbon content is increased after entering molten steel, being easy to cause molten steel carbon content is more than 0.08% upper limit, so as to cause the furnace steel report
It is useless.
Wherein, the slag modifier for refining is calculated in mass percent CaO including 60%~80%, 20%~40%
CaC2, additional amount is 1~3kg/t steel.Slag adjusting agent additional amount is excessive, and the aluminium in slag adjusting agent is largely brought into molten steel, is formed
The Als of high-content, the high Als of continuous casting process are oxidized, and form aluminium oxide, are blocked submersed nozzle, are caused to stop pouring.
It is too long when encountering heating time in practical operation, slag foaming agent additional amount can be reduced, slag modifier for refining is improved
Additional amount；It is for example put in feed bin when encountering that Al is more than 10% in slag modifier for refining or when each component content is uneven
Overlong time, it may appear that lower part aluminium content is high, and the low situation of upper part aluminium content can reduce slag modifier for refining additional amount,
Improve slag foaming agent additional amount.
Wherein, the slag foaming agent and slag modifier for refining are added after molten steel reaches LF processing station by high hopper
Enter.Slag foaming agent and slag modifier for refining is added in the ladle top of the slag, deoxidation is carried out by the way of diffusive deoxidation, deoxidation products stays
In slag, molten steel will not be mingled with because of deoxidation.
Wherein, the composition of Antaciron is calculated in mass percent as 75%Si, 23%Fe, and remaining is impurity, Antaciron
Additional amount is 0.4~0.6kg/ tons of steel, and Antaciron is added in molten steel in the outbound preceding 10~12min of LF.
Wherein, the Calcium treatment be added iron calcium line, specification 200g/m, additional amount be 2~5m/t steel, iron calcium line at
Divide the Ca, diameter 10mm, before LF is outbound for being calculated in mass percent the Fe and 20%~30% including 70%~80%
8min~10min is added, and adds in 2min, blowing argon gas 5min or more after addition.Excessive, formation CaO, the mouth of a river is added in iron calcium line
Blocking, stops pouring；Iron calcium line is added not enough, deoxidation type inclusion Al2O3Low melting point inclususions cannot be effectively modified as, nozzle blocking is stopped
It pours.
About LF refining process blowing argon gas, refining process is to add in blowing argon gas always after slag modifier for refining is added
Before entering ferrosilicon, Ar 120~150NL/min of throughput, flow is transferred to 50~80NL/min when ferrosilicon is added, and is then always maintained at
5~8min after to feeding iron calcium line.
Wherein, control refines outlet temperature at 1580 DEG C~1595 DEG C after Calcium treatment.Temperature is excessively high, the leakage of molten steel continuous casting process
Steel stops pouring；Temperature is too low, and molten steel is blocked in crystallizer, stops pouring.
Wherein, the continuous casting process carries out continuous casting using 160mm × 160mm or 200mm × 200mm section, and pulling rate is
1.5~2.0m/min.
Below by way of specific embodiment, the present invention is further illustrated.
Embodiment 1
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.04%, using alfer pre-deoxidation, alfer
Additional amount is 4kg/t steel, and oxygen activity is controlled 0.005%~0.010%；Slag foaming agent 1Kg/t steel is added in LF refining process
With slag modifier for refining 1Kg/t, control molten steel LF heating after oxygen activity be 0.0040%, Als content 0.001%, then plus
Enter Antaciron 0.5Kg/t steel control Si content 0.03%, LF is outbound to carry out Calcium treatment again；Continuous casting process using 160mm ×
160mm section carries out continuous casting, casting speed control 2.0m/min.Wherein, the slag foaming agent main component is：80%CaO,
20%CaC2, slag modifier for refining main component is：10%Al, 65%Al2O3, 25%CaO, the iron calcium line main component is：
The Ca of 70% Fe and 30%.
Continuous casting time 8 hours in the present embodiment, the slab center porosity and center segregation of production are respectively 0.5 grade and 1.0
Grade, no other defect.
Embodiment 2
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.05%, using alfer pre-deoxidation, alfer
Additional amount is 3kg/t steel, and oxygen activity is controlled 0.005%~0.010%；LF refining process is after molten steel reaches LF processing station
Slag foaming agent 3Kg/t steel and slag modifier for refining 3Kg/t, oxygen activity after control molten steel LF heating is added by high hopper
For 0.0020%, Als content 0.005%, the outbound preceding 10min of LF is added Antaciron 0.4Kg/t steel and controls Si content 0.02%,
The outbound preceding 8min of LF carries out Calcium treatment, iron calcium line 200g/m, diameter 10mm, additional amount 5m/t steel；Continuous casting process using 200mm ×
200mm section carries out continuous casting, casting speed control 1.50m/min.Wherein, slag foaming agent main component is：80%CaO, 20%
CaC2, slag modifier for refining main component is：10%Al, 65%Al2O3, 25%CaO, the iron calcium line main component is：70%
The Ca of Fe and 30%.
Continuous casting time 10 hours in the present embodiment, the slab center porosity and center segregation of production are respectively 1.0 grades and 1.0
Grade, no other defect.
Embodiment 3
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.045%, using alfer pre-deoxidation, alfer
Additional amount is 3.5kg/t steel, and oxygen activity is controlled 0.005%~0.010%；LF refining process reaches LF processing station when molten steel
Slag foaming agent 2Kg/t steel and slag modifier for refining 2Kg/t are added by high hopper afterwards, oxygen is living after control molten steel LF heating
0.0030%, Als content 0.003% is spent, the outbound preceding 12min of LF is added Antaciron 0.6Kg/t steel and controls Si content
0.025%；The outbound preceding 10min of LF carries out Calcium treatment, iron calcium line 200g/m, diameter 10mm, additional amount 3m/t steel；Continuous casting process is adopted
Continuous casting, casting speed control 2.0m/min are carried out with 160mm × 160mm section.The slag foaming agent main component is：80%
CaO, 20%CaC2, slag modifier for refining main component is：10%Al, 65%Al2O3, 25%CaO, the iron calcium line main component
For：The Ca of 70% Fe and 30%.
Continuous casting time 9 hours in the present embodiment, the slab center porosity and center segregation of production are respectively 0.5 grade and 0.5
Grade, no other defect.
Comparative example 1
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.045%, using alfer pre-deoxidation, alfer
Additional amount is 3.5kg/t steel；Slag foaming agent 2kg/t steel is added in LF refining process, is added without slag modifier for refining, controls molten steel LF
Oxygen activity 0.0080% after heating, Als content 0.003%, addition Antaciron 0.5Kg/t steel, Si content 0.002%,
Calcium treatment is carried out again before LF is outbound, iron calcium line 200g/m, diameter 10mm, additional amount 3m/t steel；Continuous casting process using 160mm ×
160mm section carries out continuous casting, casting speed control 2.0m/min.Wherein, the slag foaming agent main component is：80%CaO,
20%CaC2, the iron calcium line main component is：The Ca of 70% Fe and 30%.
Continuous casting time 0.5 hour in this comparative example seriously causes continuous casting to terminate, the casting of production due to seething in packet in continuous casting
There are a large amount of air blister defects in base cross section.
Comparative example 2
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.045%, using alfer pre-deoxidation, alfer
Additional amount is 3.5kg/t steel, and oxygen activity is controlled 0.005%~0.010%；LF refining process reaches LF processing station when molten steel
Slag modifier for refining 2Kg/t is added by high hopper afterwards, slag foaming agent, oxygen activity after control molten steel LF heating is not added
Antaciron 0.6Kg/t steel is added in the outbound preceding 12min of 0.0080%, LF, and Si content 0.002%, Als content 0.001%, LF goes out
10min carries out Calcium treatment before standing, iron calcium line 200g/m, diameter 10mm, additional amount 3m/t steel；Continuous casting process using 160mm ×
160mm section carries out continuous casting, casting speed control 2.0m/min.The slag foaming agent main component is：80%CaO, 20%
CaC2, slag modifier for refining main component is：10%Al, 65%Al2O3, 25%CaO, the iron calcium line main component is：70%
The Ca of Fe and 30%.
Continuous casting time 0.5 hour in this comparative example seriously causes continuous casting to terminate, the casting of production due to seething in packet in continuous casting
There are a large amount of air blister defects in base cross section.
Comparative example 3
Welding rod steel H08A is smelted through converter smelting, LF refining, continuous casting step to be made, and specially operation is：
It is blast-melted through converter smelting control endpoint carbon content be 0.045%, using alfer pre-deoxidation, alfer
Additional amount is 3.5kg/t steel, and oxygen activity is controlled 0.005%~0.010%；LF refining process reaches LF processing station when molten steel
Slag foaming agent 2Kg/t steel and slag modifier for refining 2Kg/t are added by high hopper afterwards, oxygen is living after control molten steel LF heating
0.0030%, Als content 0.003% is spent, Antaciron, Si content 0.001%, the outbound preceding 10min of LF are added without before LF is outbound
Carry out Calcium treatment, iron calcium line 200g/m, diameter 10mm, additional amount 3m/t steel additional amount 3m/t steel；Continuous casting process using 160mm ×
160mm section carries out continuous casting, casting speed control 2.0m/min.The slag foaming agent main component is：80%CaO, 20%
CaC2, slag modifier for refining main component is：10%Al, 65%Al2O3, 25%CaO, the iron calcium line main component is：70%
The Ca of Fe and 30%.
Continuous casting time 8 hours in the present embodiment, the slab center porosity and center segregation of production are respectively 0.5 grade and 0.5
Grade, casting blank section find a large amount of air blister defects.
By Examples 1 to 3 and comparative example 1~3 it is found that the step of present invention passes through converter smelting, LF refining, continuous casting, energy
Effectively control slab quality and molten steel even pours the time, and same working condition, this method can save 2 tundish, improve life
Efficiency is produced, ton steel benefit has significant economic benefit, be worthy of popularization at 20 yuan or more.
Claims (10)
1. the smelting process of welding rod steel H08A, step includes converter smelting, LF refining, continuous casting, it is characterised in that：
A. when the endpoint molten steel carbon content of converter smelting is 0.04%~0.05%, slag-stopping tapping, tapping process is added ferro-aluminum and closes
Golden pre-deoxidation controls oxygen activity 0.005%~0.010%；
Slag foaming agent and slag modifier for refining diffusive deoxidation, oxygen activity after control molten steel LF heating is added in b.LF refining process
It is 0.001%~0.005% for 0.0020%~0.0040%, Als content, Antaciron control Si content, which is then added, is
0.02%~0.03%, then Calcium treatment is carried out, the slag foaming agent is that main component is CaO, CaC2Mixture, the essence
Refining slag adjusting agent is that main component is Al, Al2O3, CaO mixture, wherein Als refers to the Al being dissolved in molten steel.
2. the smelting process of welding rod steel H08A according to claim 1, it is characterised in that：The alfer at least meets
One in following：
The composition of alfer is calculated in mass percent as 40%Al, 58%Fe, and remaining is impurity；
Alfer additional amount is 3~4kg/t steel.
3. the smelting process of welding rod steel H08A according to claim 1 or 2, it is characterised in that：The slag-stopping tapping uses
Slide plate pushing off the slag, the control of the lower quantity of slag is in 4~6kg/ tons of steel, and 1650 DEG C~1680 DEG C of tapping temperature.
4. the smelting process of described in any item welding rod steel H08A according to claim 1~3, it is characterised in that：The slag hair
Infusion at least meets one in following：
Slag foaming agent is calculated in mass percent the CaC of the CaO including 60%~80%, 20%~40%2；
The additional amount of slag foaming agent is 1~3kg/t steel.
5. the smelting process of welding rod steel H08A according to any one of claims 1 to 4, it is characterised in that：The refining is adjusted
Slag agent at least meets one in following：
Slag modifier for refining is calculated in mass percent the Al of the Al including 5%~10%, 60%~70%2O3, 25%~35%
CaO；
The additional amount of slag modifier for refining is 1~3kg/t steel.
6. the smelting process of described in any item welding rod steel H08A according to claim 1~5, it is characterised in that：The slag hair
Infusion and slag modifier for refining are added after molten steel reaches LF processing station by high hopper.
7. the smelting process of described in any item welding rod steel H08A according to claim 1~6, it is characterised in that：The ferrosilicon closes
Gold at least meets one in following：
The composition of Antaciron is calculated in mass percent as 75%Si, 23%Fe, and remaining is impurity；
The additional amount of Antaciron is 0.4~0.6kg/ tons of steel；
Antaciron is added in molten steel in the outbound preceding 10~12min of LF.
8. the smelting process of described in any item welding rod steel H08A according to claim 1~7, it is characterised in that：The Calcium treatment
For iron calcium line is added, specification 200g/m, additional amount is 2~5m/t steel, and at least meets one in following：
The diameter of iron calcium line is 10mm；
The ingredient of iron calcium line is calculated in mass percent the Ca of the Fe and 20%~30% including 70%~80%；
Iron calcium line 8min~10min before LF is outbound is added, and adds in 2min, blowing argon gas 5min or more after addition.
9. the smelting process of described in any item welding rod steel H08A according to claim 1~8, it is characterised in that：It is controlled after Calcium treatment
System refining outlet temperature is at 1580 DEG C~1595 DEG C.
10. the smelting process of described in any item welding rod steel H08A according to claim 1~9, it is characterised in that：The continuous casting mistake
Cheng Caiyong 160mm × 160mm or 200mm × 200mm section carries out continuous casting, and pulling rate is 1.5~2.0m/min.
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| CN111893242A (en) * | 2020-08-12 | 2020-11-06 | 宝武集团鄂城钢铁有限公司 | Smelting method for deep desulfurization of low-aluminum steel |
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