CN106755731A - A kind of method of duplex technique productions low-carbon welding wire steel - Google Patents

A kind of method of duplex technique productions low-carbon welding wire steel Download PDF

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Publication number
CN106755731A
CN106755731A CN201611205721.1A CN201611205721A CN106755731A CN 106755731 A CN106755731 A CN 106755731A CN 201611205721 A CN201611205721 A CN 201611205721A CN 106755731 A CN106755731 A CN 106755731A
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welding wire
refining
steel
tapping
technique productions
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CN106755731B (en
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罗衍昭
季晨曦
边吉明
单伟
潘宏伟
邓小旋
肖茂元
赵长亮
裴培
曾智
张宏艳
唐德池
崔阳
田志红
张丙龙
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Shougang Corp
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Shougang Corp
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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
    • 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
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C2007/0093—Duplex process; Two stage processes

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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)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The present invention relates to a kind of method of duplex technique productions low-carbon welding wire steel, comprise the following steps：Molten steel of the mechanical mixing method to the molten iron after desulfurizing iron, desulfurization after the molten steel after the tapping of dephosphorization converter smelting, the tapping feeding decarburization converter smelting of dephosphorization converter, decarburization converter is circulated degassing method refining, circulation degassing method refining carries out ladle refining, ladle refining carries out sheet billet continuous casting.The method of the duplex technique productions low-carbon welding wire steel can guarantee that welding wire is functional, improve the metallurgical quality of welding wire.

Description

A kind of method of duplex technique productions low-carbon welding wire steel
Technical field
The present invention relates to metallurgical technology field, more particularly to a kind of method of duplex technique productions low-carbon welding wire steel.
Background technology
With the raising of solder technology and industrial automatization, welding wire has been widely used in vehicle manufacture, shipbuilding, work In the manufacturing industry such as journey machinery, bridge, welding material is the basis of solder technology, and it is advanced welding procedure, welding equipment is carried For support, the yield of China's welding wire is also in rapid growth.The extensive use of welding wire determines that welding wire steel will have good drawing Can and welding performance, thus mass fraction to the chemical composition in steel has strict requirements.
The performance of welding wire is directly connected to whole welded combination property and safety, including mechanical property, high temperature resistant Performance, creep-resistant property and welding technological properties etc..The inherent quality of welding wire steel chemical composition decision welding wire, and the welding of welding wire Processing performance will directly affect the quality or even whole welded security of weld seam, therefore to the smelting composition tool of welding wire steel There are strict requirements.
Production method of the prior art cannot ensure that component of weld wire is uniform, it is understood that there may be serious component segregation, drawing Poor-performing.
The content of the invention
The invention provides a kind of method of duplex technique productions low-carbon welding wire steel, solve or part solves existing skill Production method in art cannot ensure that component of weld wire is uniform, it is understood that there may be serious component segregation, the poor technology of drawing property Problem, realizes and ensures that welding wire is functional, improves the technique effect of the metallurgical quality of welding wire.
A kind of method of duplex technique productions low-carbon welding wire steel that the present invention is provided, comprises the following steps：
By mechanical mixing method to desulfurizing iron, calculate by percentage to the quality, the S of the molten iron after desulfurization≤ 0.0005%；
The molten iron after by desulfurization is smelted by dephosphorization converter, calculate by percentage to the quality, and the dephosphorization converter goes out C≤3.5% of steel, Si≤0.0020%, S≤0.0040%；
Decarburization converter smelting is sent into the tapping of the dephosphorization converter, is calculated by percentage to the quality, the decarburization converter C≤0.05% of tapping, Si≤0.010%；
Tapping to the decarburization converter is circulated degassing method refining, calculates by percentage to the quality, the circulating degasification C≤0.01% of the molten steel after method refining, Si≤0.0045%, S≤0.0050%, N≤0.0018%；
Molten steel after being refined to the circulation degassing method carries out ladle refining, calculates by percentage to the quality, the ladle essence C≤0.03% of the molten steel after refining, Si≤0.0090%, S≤0.0030%, N≤0.0028%；
Sheet billet continuous casting is carried out to the molten steel after the ladle refining.
Preferably, the temperature of the tapping of the dephosphorization converter is 1300~1320 DEG C.
Preferably, during the decarburization converter smelting whole Argon and control nitrogen after the stove of the decarburization converter≤ 15ppm；
The outlet temperature of the decarburization converter is 1685~1705 DEG C；
Lime and fluorite are added in tapping process, not deoxidation tapping is carried out, operated according to front and rear slide plate pushing off the slag；The tapping Time be 6~8min.
Preferably, in the circulation degassing method refining process, molten steel heating blowing oxygen quantity≤150Nm3, vacuum processing time >=6min, calm time >=10min；
The circulation degassing method refining process selects early stage vacuum tank, the nitrogen pick-up≤3ppm of whole refining process.
Preferably, the temperature of arriving at a station of the ladle refining is for 1575~1585 DEG C；
The end temp of the ladle refining is 1590~1610 DEG C.
Preferably, nitrogen pick-up≤the 8ppm of the ladle refining.
Preferably, the sheet billet continuous casting is using the casting of ladle, tundish and crystallizer whole process protection.
Preferably, the ladle to be opened first gone up when pouring open after sleeve pipe pouring, first stop to pluck sleeve pipe after pouring when stopping pouring；
The tundish increases basicity coverture, and tundish is to using submersed nozzle between crystallizer.
Preferably, the liquid fluctuating control of the crystallizer is in ± 3mm, the degree of superheat is 25~40 DEG C；
The protection thickness of slag layer of the crystallizer is 10~12mm.
Preferably, three road argon flow amounts of the casting machine of the sheet billet continuous casting are both less than ＜ 5Nl/min.
One or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage：
As a result of mechanical mixing method to the molten iron after desulfurizing iron, desulfurization by dephosphorization converter smelting, dephosphorization converter Tapping feeding decarburization converter smelting, that the tapping of decarburization converter is circulated degassing method refining (RH refinings), circulation degassing method is smart The molten steel that molten steel after refining is carried out after ladle refining (LF refining), ladle refining carries out sheet billet continuous casting, realizes to low-carbon welding wire steel RH+LF duplex technique productions methods, calculate by percentage to the quality, make C≤0.03% of low-carbon welding wire steel, Si≤ 0.0090%, S≤0.0030%, N≤0.0028%, it is ensured that the low-carbon welding wire steel of production has good drawing property and welding Performance.So, efficiently solving production method of the prior art cannot ensure that component of weld wire is uniform, it is understood that there may be it is serious into Divide segregation, the poor technical problem of drawing property is realized and ensures that welding wire is functional, improves the technology of the metallurgical quality of welding wire Effect.
Brief description of the drawings
Fig. 1 is the flow chart of the method for duplex technique productions low-carbon welding wire steel provided in an embodiment of the present invention.
Specific embodiment
The embodiment of the present application provides a kind of method of duplex technique productions low-carbon welding wire steel, solves or part solves Production method of the prior art cannot ensure that component of weld wire is uniform, it is understood that there may be serious component segregation, drawing property is poor Technical problem, by molten iron KR desulfurization, dephosphorization converter, decarburization converter, RH refinings, LF refining, the technique of sheet billet continuous casting, realize Guarantee welding wire is functional, improves the technique effect of the metallurgical quality of welding wire.
A kind of method of the duplex technique productions low-carbon welding wire steel provided referring to accompanying drawing 1, the present invention, comprises the following steps：
S1：By mechanical mixing method (KR) to desulfurizing iron, calculate by percentage to the quality, the S of the molten iron after desulfurization≤ 0.0005%；KR procedure calls depth desulfurization, KR inquires for bright face after skimming, the desulfurization band quantity of slag of keeping under strict control.
S2：Molten iron after desulfurization is smelted by dephosphorization converter, is calculated by percentage to the quality, the C of the tapping of dephosphorization converter ≤ 3.5%, Si≤0.0020%, S≤0.0040%；The temperature of the tapping of dephosphorization converter is 1300~1320 DEG C.
S3：Decarburization converter smelting is sent into the tapping of dephosphorization converter, is calculated by percentage to the quality, the tapping of decarburization converter C≤0.05%, Si≤0.010%；Whole Argon and the low nitrogen pattern of use, control decarburization converter during decarburization converter smelting Stove after nitrogen≤15ppm；The outlet temperature of decarburization converter is 1685~1705 DEG C；Lime and fluorite are added in tapping process, is entered Capable not deoxidation tapping, operates according to front and rear slide plate pushing off the slag, reduces slag；The time of tapping is 6~8min.Selected in smelting process Suitable rifle position and oxygen flow, strengthen melting bath stirring, it is desirable to keep whole slugging good.
S4：Tapping to decarburization converter is circulated degassing method (RH) refining, calculates by percentage to the quality, circulation degassing method C≤0.01% of the molten steel after refining, Si≤0.0045%, S≤0.0050%, N≤0.0018%；In RH refining process, steel Water intensification blowing oxygen quantity≤150Nm3, vacuum processing time >=6min, calm time >=10min；Circulation degassing method refining process is selected Select early stage vacuum tank, the nitrogen pick-up≤3ppm of whole refining process.RH refines decarburization, degassing, intensification, the uniform molten steel for molten steel The aspect such as temperature and composition, removal of inclusions, refining effect is good, and process cycle is short, and production capacity is big, is especially suitable for and large-scale turn Stove is engaged.
S5：Molten steel after being refined to circulation degassing method carries out ladle (LF) refining, calculates by percentage to the quality, ladle refining C≤0.03% of molten steel afterwards, Si≤0.0090%, S≤0.0030%, N≤0.0028%；The temperature of arriving at a station of ladle refining is 1575~1585 DEG C；The end temp of ladle refining is 1590~1610 DEG C, the nitrogen pick-up≤8ppm of ladle refining.LF refining is made Slag operation is deep desulphation mode treatment, and LF end temps are：1590~1610 DEG C, LF essences pour in first 1600~1610 DEG C of stove, company The task of refining is mainly the de- S of slag making, and LF stoves processing procedure does not carry out deep desulfurization to prevent from increasing silicon, according to entering the station and process S contents The de- S mixings time of control, as long as reaching the S contents of necessary requirement.LF refining operation closes dedusting, control liter using whole The argon flow amount of warm process.
S6：Sheet billet continuous casting is carried out to the molten steel after ladle refining.Sheet billet continuous casting is whole using ladle, tundish and crystallizer Protective casting, it is to avoid the secondary oxidation of molten steel, effectively reduces the field trash of continuous casting billet.Ladle is opened after first going up sleeve pipe when pouring and opened Pour, first stop to pluck sleeve pipe after pouring when stopping pouring；Tundish increases basicity coverture, and tundish is to using immersion water between crystallizer Mouthful.In ± 3mm, the degree of superheat is 25~40 DEG C for the liquid fluctuating control of crystallizer；The protection thickness of slag layer of crystallizer be 10~ 12mm.Three road argon flow amounts of the casting machine of sheet billet continuous casting are both less than 5Nl/min, while adjusting back pressure reaches more than 0.2bar.
Wherein, field trash is vulcanized for steel for welding wire, in steel makes the ductility of steel and toughness reduction, S too high levels, wire rod Drawing property is deteriorated, the reduction of wire rod lumber recovery；After carbon welding rod steel is through drawing, as welding rod steel core, it is desirable to stable components, in steel The harmful element content such as S is as low as possible, and Si in steel, and N content also requires that control within the specific limits, and the mass fraction of Si is straight The mechanical property and porosity resistance ability and manufacturing process performance of influence weld metal are connect, the height of Si mass fractions is direct in steel Influence welding rod performance, thus it is strict to the mass fraction limitation of Si, and harm of the Si to welding rod quality essentially consists in it in weld seam There is the inductile tendency of drop.N can play a part of reinforcing and stable austenite in steel, but N content is too high, in heating process Harmful element reduces physics, the mechanical performance of steel as Second Phase Precipitation, makes steel aging, and N element is also that weld metal forms gas One of principal element in hole, it is necessary to N content in strict control steel.Nitrogen exists in steel with nitride form, its content influence steel Aging performance, while nitride separate out can also cause metal lattice distort and produce larger internal stress, so as to be degrading steel Plasticity and impact flexibility steel is become fragile.
The method of the duplex technique productions low-carbon welding wire steel that the application is provided, by mechanical mixing method to desulfurizing iron, de- Molten iron after sulphur is smelted by dephosphorization converter, decarburization converter smelting is sent into the tapping of dephosphorization converter, the tapping of decarburization converter is carried out After molten steel after circulation degassing method refining (RH refinings), circulation degassing method refining carries out ladle refining (LF refining), ladle refining Molten steel carry out sheet billet continuous casting, realize the RH+LF duplex technique productions methods to low-carbon welding wire steel, Si, S in strict control molten steel With the content of N, calculate by percentage to the quality, make C≤0.03% of low-carbon welding wire steel, Si≤0.0090%, S≤0.0030%, N ≤ 0.0028%, it is ensured that the low-carbon welding wire steel of production has good drawing property and welding performance.
The method of the duplex technique productions low-carbon welding wire steel for providing the present invention with reference to the accompanying drawings and examples is carried out in detail Thin description：
Embodiment one
Using the technique road of molten iron KR desulfurization → dephosphorization converter → decarburization converter → RH refining → LF refinings → sheet billet continuous casting Line production low-carbon (LC), low silicon, low-sulfur, the welding wire steel of low nitrogen.
S1：Using the KR de- S of stirring, the C content of desulfurized molten iron is for 4.3%, Si contents for 0.13%, S contents are for molten iron 0, the temperature of outbound molten iron is 1323 DEG C.
S2：The tapping temperature of dephosphorization converter is 1312 DEG C, and C content is 3.4%, and P content is that 0.036%, S contents are 0.0038%.
S3：Outlet temperature after decarburization converter smelting is 1703 DEG C, and terminal C content is 0.027%, and terminal oxygen content is 0.0741%, N content is detected as 0.0014% after stove.Tapping process addition lime, fluorite, all using pushing off the slag before and after slide plate, Pushing off the slag works well, and the tapping time is 6min.
S4：After vacuum processing time 20min, the RH refining of RH refinings terminates, C content is that 0.0084%, Si contents are 0.0043%, S content are 0.0047%, and N content is 0.0013%.
S5：To molten steel slag modification of entering the station in LF refining, aluminum shot, ferro-aluminum, ferromanganese are added.LF stoves processing procedure does not carry out deep de- To prevent from increasing silicon, the S contents that LF refining terminates are 0.0024% to sulphur, and N content is that 0.0020%, Si contents are 0.0078%.
S6：Cast using full guard, to open first go up when pouring open after sleeve pipe and pour, first stop to pluck sleeve pipe after pouring when stopping pouring, this pours secondary casting Base section 230mm × 1600mm, target pull rate is 1.35m/min, and casting uses 80t tundish, submersed nozzle, high-alkali middle bag Coverture, crystallizer low carbon protective slag.Automatically controlled using mold liquid level, liquid fluctuating is controlled within ± 3mm, the degree of superheat 35 DEG C, the C content of finished product is that 0.029%, Si contents are 0.0081%, and N content is that 0.0020%, S contents are 0.0020%, into Part is all qualified, meets finished product requirement.
Embodiment two
Using the technique road of molten iron KR desulfurization → dephosphorization converter → decarburization converter → RH refining → LF refinings → sheet billet continuous casting Line production low-carbon (LC), low silicon, low-sulfur, the welding wire steel of low nitrogen.
S1：Using the KR de- S of stirring, the C content of desulfurized molten iron is for 4.1%, Si contents for 0.14%, S contents are for molten iron 0.0002%, the temperature of outbound molten iron is 1326 DEG C.
S2：The tapping temperature of dephosphorization converter is 1315 DEG C, and C content is 3.2%, and P content is that 0.031%, S contents are 0.0037%.
S3：Outlet temperature after decarburization converter smelting is 1698 DEG C, and terminal C content is 0.033%, and terminal oxygen content is 0.0762%, N content is detected as 0.0011% after stove.Tapping process addition lime, fluorite, all using pushing off the slag before and after slide plate, Pushing off the slag works well, and the tapping time is 7min.
S4：After vacuum processing time 20min, the RH refining of RH refinings terminates, C content is that 0.0081%, Si contents are 0.0040%, S content are 0.0049%, and N content is 0.0016%.
S5：To molten steel slag modification of entering the station in LF refining, aluminum shot, ferro-aluminum, ferromanganese are added.LF stoves processing procedure does not carry out deep de- To prevent from increasing silicon, the S contents that LF refining terminates are 0.0024% to sulphur, and N content is that 0.0023%, Si contents are 0.0082%.
S6：Cast using full guard, to open first go up when pouring open after sleeve pipe and pour, first stop to pluck sleeve pipe after pouring when stopping pouring, this pours secondary casting Base section 230mm × 1600mm, target pull rate is 1.40m/min, and casting uses 80t tundish, submersed nozzle, high-alkali middle bag Coverture, crystallizer low carbon protective slag.Automatically controlled using mold liquid level, liquid fluctuating is controlled within ± 3mm, the degree of superheat 32 DEG C, the C content of finished product is that 0.027%, Si contents are 0.0074%, and N content is that 0.0023%, S contents are 0.0026%, into Part is all qualified, meets finished product requirement.
Embodiment three
Using the technique road of molten iron KR desulfurization → dephosphorization converter → decarburization converter → RH refining → LF refinings → sheet billet continuous casting Line production low-carbon (LC), low silicon, low-sulfur, the welding wire steel of low nitrogen.
S1：Using the KR de- S of stirring, the C content of desulfurized molten iron is for 4.2%, Si contents for 0.11%, S contents are for molten iron 0.0001%, the temperature of outbound molten iron is 1324 DEG C.
S2：The tapping temperature of dephosphorization converter is 1318 DEG C, and C content is 3.1%, and P content is that 0.029%, S contents are 0.0035%.
S3：Outlet temperature after decarburization converter smelting is 1688 DEG C, and terminal C content is 0.034%, and terminal oxygen content is 0.0795%, N content is detected as 0.0012% after stove.Tapping process addition lime, fluorite, all using pushing off the slag before and after slide plate, Pushing off the slag works well, and the tapping time is 8min.
S4：After vacuum processing time 15min, the RH refining of RH refinings terminates, C content is that 0.0084%, Si contents are 0.0042%, S content are 0.0047%, and N content is 0.0015%.
S5：To molten steel slag modification of entering the station in LF refining, aluminum shot, ferro-aluminum, ferromanganese are added.LF stoves processing procedure does not carry out deep de- To prevent from increasing silicon, the S contents that LF refining terminates are 0.0023% to sulphur, and N content is that 0.0025%, Si contents are 0.0084%.
S6：Cast using full guard, to open first go up when pouring open after sleeve pipe and pour, first stop to pluck sleeve pipe after pouring when stopping pouring, this pours secondary casting Base section 230mm × 1600mm, target pull rate is 1.35m/min, and casting uses 80t tundish, submersed nozzle, high-alkali middle bag Coverture, crystallizer low carbon protective slag.Automatically controlled using mold liquid level, liquid fluctuating is controlled within ± 3mm, the degree of superheat 29 DEG C, the C content of finished product is that 0.026%, Si contents are 0.0077%, and N content is that 0.0026%, S contents are 0.0021%, into Part is all qualified, meets finished product requirement.
One or more technical schemes provided in the embodiment of the present application, at least have the following technical effect that or advantage：
As a result of mechanical mixing method to the molten iron after desulfurizing iron, desulfurization by dephosphorization converter smelting, dephosphorization converter Tapping feeding decarburization converter smelting, that the tapping of decarburization converter is circulated degassing method refining (RH refinings), circulation degassing method is smart The molten steel that molten steel after refining is carried out after ladle refining (LF refining), ladle refining carries out sheet billet continuous casting, realizes to low-carbon welding wire steel RH+LF duplex technique productions methods, calculate by percentage to the quality, make C≤0.03% of low-carbon welding wire steel, Si≤ 0.0090%, S≤0.0030%, N≤0.0028%, it is ensured that the low-carbon welding wire steel of production has good drawing property and welding Performance.So, efficiently solving production method of the prior art cannot ensure that component of weld wire is uniform, it is understood that there may be it is serious into Divide segregation, the poor technical problem of drawing property is realized and ensures that welding wire is functional, improves the technology of the metallurgical quality of welding wire Effect.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect Describe in detail, should be understood that and the foregoing is only specific embodiment of the invention, be not limited to this hair Bright, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. should be included in the present invention Protection domain within.

Claims (10)

1. a kind of method of duplex technique productions low-carbon welding wire steel, it is characterised in that comprise the following steps：
By mechanical mixing method to desulfurizing iron, calculate by percentage to the quality, S≤0.0005% of the molten iron after desulfurization；
The molten iron after by desulfurization is smelted by dephosphorization converter, calculates by percentage to the quality, the C of the tapping of the dephosphorization converter ≤ 3.5%, Si≤0.0020%, S≤0.0040%；
Decarburization converter smelting is sent into the tapping of the dephosphorization converter, is calculated by percentage to the quality, the tapping of the decarburization converter C≤0.05%, Si≤0.010%；
Tapping to the decarburization converter is circulated degassing method refining, calculates by percentage to the quality, the circulation degassing method essence C≤0.01% of the molten steel after refining, Si≤0.0045%, S≤0.0050%, N≤0.0018%；
Molten steel after being refined to the circulation degassing method carries out ladle refining, calculates by percentage to the quality, after the ladle refining Molten steel C≤0.03%, Si≤0.0090%, S≤0.0030%, N≤0.0028%；
Sheet billet continuous casting is carried out to the molten steel after the ladle refining.
2. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
The temperature of the tapping of the dephosphorization converter is 1300~1320 DEG C.
3. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
Whole Argon and nitrogen≤15ppm after the stove of the decarburization converter is controlled during the decarburization converter smelting；
The outlet temperature of the decarburization converter is 1685~1705 DEG C；
Lime and fluorite are added in tapping process, not deoxidation tapping is carried out, operated according to front and rear slide plate pushing off the slag；The tapping when Between be 6~8min.
4. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
In the circulation degassing method refining process, molten steel heating blowing oxygen quantity≤150Nm3, vacuum processing time >=6min, when calm Between >=10min；
The circulation degassing method refining process selects early stage vacuum tank, the nitrogen pick-up≤3ppm of whole refining process.
5. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
The temperature of arriving at a station of the ladle refining is for 1575~1585 DEG C；
The end temp of the ladle refining is 1590~1610 DEG C.
6. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
Nitrogen pick-up≤the 8ppm of the ladle refining.
7. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 1, it is characterised in that
The sheet billet continuous casting is using the casting of ladle, tundish and crystallizer whole process protection.
8. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 7, it is characterised in that
The ladle to be opened first gone up when pouring open after sleeve pipe and poured, and first stops to pluck sleeve pipe after pouring when stopping pouring；
The tundish increases basicity coverture, and tundish is to using submersed nozzle between crystallizer.
9. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 7, it is characterised in that
In ± 3mm, the degree of superheat is 25~40 DEG C for the liquid fluctuating control of the crystallizer；
The protection thickness of slag layer of the crystallizer is 10~12mm.
10. the method for duplex technique productions low-carbon welding wire steel as claimed in claim 7, it is characterised in that
Three road argon flow amounts of the casting machine of the sheet billet continuous casting are both less than 5Nl/min.
CN201611205721.1A 2016-12-23 2016-12-23 A kind of method of duplex technique production low-carbon welding wire steel Active CN106755731B (en)

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