CN110016604A - A kind of smelting process improving plate surface quality - Google Patents

A kind of smelting process improving plate surface quality Download PDF

Info

Publication number
CN110016604A
CN110016604A CN201910378655.5A CN201910378655A CN110016604A CN 110016604 A CN110016604 A CN 110016604A CN 201910378655 A CN201910378655 A CN 201910378655A CN 110016604 A CN110016604 A CN 110016604A
Authority
CN
China
Prior art keywords
degree
carry out
refining
furnace
desulfurization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910378655.5A
Other languages
Chinese (zh)
Inventor
翟冬雨
吴俊平
方磊
姜金星
洪君
靳星
刘呈军
杜海军
员强鹏
殷杰
冯巍
雷晓荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Iron and Steel Co Ltd
Original Assignee
Nanjing Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Iron and Steel Co Ltd filed Critical Nanjing Iron and Steel Co Ltd
Priority to CN201910378655.5A priority Critical patent/CN110016604A/en
Publication of CN110016604A publication Critical patent/CN110016604A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • C21C7/0645—Agents used for dephosphorising or desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Abstract

The invention discloses a kind of smelting process for improving plate surface quality, chemical component and mass percent are as follows: C:0.02%~0.60%, Si≤0.20%, Mn:0.30%~2.20%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity.The present invention smelts composition, high purity steel smelting, hypoxemia nitrogen control of deleterious element by reasonably adjusting, and the controls such as reasonable degree of superheat control, covering slag selection, dynamic soft-reduction adjustment achieve the purpose that optimization cc billet surface quality.

Description

A kind of smelting process improving plate surface quality
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of smelting process for improving plate surface quality.
Background technique
As domestic market competition becomes a flash point increasingly, client requires plate quality increasingly harsher, engineering machinery, shipbuilding Etc. industries to plate surface quality require it is very strict, wherein Ka Te steel plate, viking line steel plate are high to surface requirements, Macroscopic surface roughness caused by not allowing the iron scale due to indentation to fall off, does not allow because producing in manufacturing process Raw water ripples, whole steel plate are not allow for pockmark pitted skin.To plate surface quality, tackling key problem technical staff often stares at rolling Process, checkout procedure, but produce little effect, it is ineffective, influence of the smelting process to mill product surface quality is ignored, is ignored The effect of material raw material itself.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of smelting process for improving plate surface quality,
S1, its chemical component and mass percent are as follows: C:0.02%~0.60%, Si≤0.20%, Mn:0.30%~2.20%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S≤0.0010% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；Tapping Temperature of Bof 1680~1720 ℃；Converter tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 10~20min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 30~40 DEG C, select suitable protection according to carbon content Slag, it is ensured that liquid slag layer 10~15mm of thickness on the upside of crystallizer, four side liquid slag layer 5~10mm of thickness of crystallizer are adjusted simultaneously Basicity, the viscosity of protection, are adjusted by pulling rate, are guaranteed that dynamic soft-reduction is depressed in horizontal segment, are adjusted secondary cooling intensity, guarantee Slab goes out conticaster rear surface temperature >=800 degree.
Technical effect: the present invention starts with from smelting procedure improvement, is rationally controlled by smelting procedure, improves slab table Face, subcutaneous quality solve casting billet surface and generate defect to the danger of rolled plate to improve the surface quality of rolled plate Evil reduces slab because surface defect carries out the probability of reconditioning processing, effectively increases plate surface quality.
The technical solution that the present invention further limits is:
A kind of smelting process of preceding improvement plate surface quality,
S1, its chemical component and mass percent are as follows: C:0.02%~0.20%, Si≤0.20%, Mn:1.20%~2.20%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0008% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1696 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 16min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 38 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 13mm, four side liquid slag layer thickness 8mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, is adjusted by pulling rate, is guaranteed that dynamic soft-reduction is depressed in horizontal segment, is adjusted secondary cooling intensity, guarantee that slab goes out conticaster 860 degree of rear surface temperature.
A kind of smelting process of preceding improvement plate surface quality,
S1, its chemical component and mass percent are as follows: C:0.20%~0.60%, Si≤0.20%, Mn:0.30%~1.60%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0006% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1706 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 13min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 33 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 12mm, four side liquid slag layer thickness 7mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, is adjusted by pulling rate, is guaranteed that dynamic soft-reduction is depressed in horizontal segment, is adjusted secondary cooling intensity, guarantee that slab goes out conticaster 830 degree of rear surface temperature.
The beneficial effects of the present invention are:
(1) reasonable component designs, Si element lighter weight most important to plate surface quality, continuous casting process in the present invention It is easy to be enriched with to form SiO to casting billet surface2, SiO2With Fe3O4In conjunction with production 2FeOSiO2, fayalite is in conjunction with steel matrix Preferably, be not easy during the rolling process de-scaling removal, therefore will cause surface quality deterioration, composition design in require Si≤ 0.15%；Effectively control N content, addition Ti carry out effective fixed nitrogen, prevent nitrogen with Nb, Cu element in conjunction with, generation fragmentation line, to Nb, The Cu element usage amount upper limit is controlled；Ni element can improve the low-temperature flexibility of steel grade, but excessive addition will increase molten steel Viscosity, will cause covering slag slag during continuous casting, so that surface quality be caused to deteriorate；Sulfur content is controlled, is avoided The influence of manganese sulfide inclusion Surface Quality；
(2) Tapping Temperature of Bof sets 1680 DEG C~1720 DEG C in the present invention, is conducive to high temperature desulfurizing, and converter tapping alloying is made Slag is advantageous, guarantees the control of refining process nitrogen content, stabilizes finished product nitrogen content, the stabilization of advantageous alloying element；
(3) control of the continuous casting degree of superheat ensure that dissolving fully for covering slag in the present invention, stabilize the thickness of covering slag liquid slag layer, Key effect is played to the stabilization of cc billet surface quality；Dynamic soft-reduction is in horizontal segment pressure, reduces casting blank solidification mistake Deformation in journey, stabilizes cc billet surface quality；The adjustment of secondary cooling ensure that temperature is stablized after slab goes out casting machine, reduces Slab is led to the damage of surface quality in phase transition process by external force.
Detailed description of the invention
Fig. 1 is that embodiment 1 produces blank surface quality；
Fig. 2 is that embodiment 1 produces plate surface quality.
Specific embodiment
Embodiment 1
A kind of smelting process improving plate surface quality provided in this embodiment,
S1, its chemical component and mass percent are as follows: C:0.02%~0.20%, Si≤0.20%, Mn:1.20%~2.20%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0008% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1696 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, it is ensured that degassing completely, reduces steel water oxygen, nitrogen, hydrogen and contains Amount, carries out Calcium treatment after vacuum processing, carry out Calcium treatment after vacuum processing, quiet after Calcium treatment to stir 16min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 38 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 13mm, four side liquid slag layer thickness 8mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, guarantees the mobile performance of melt cinder, is adjusted by pulling rate, guarantees that dynamic soft-reduction is depressed in horizontal segment, adjustment secondary cooling is strong Degree, guarantees that slab goes out 860 degree of conticaster rear surface temperature.
Embodiment 2
A kind of smelting process improving plate surface quality provided in this embodiment,
S1, its chemical component and mass percent are as follows: C:0.20%~0.60%, Si≤0.20%, Mn:0.30%~1.60%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0006% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1706 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, it is ensured that degassing completely, reduces steel water oxygen, nitrogen, hydrogen and contains Amount, carries out Calcium treatment after vacuum processing, carry out Calcium treatment after vacuum processing, quiet after Calcium treatment to stir 13min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 33 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 12mm, four side liquid slag layer thickness 7mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, guarantees the mobile performance of melt cinder, is adjusted by pulling rate, guarantees that dynamic soft-reduction is depressed in horizontal segment, adjustment secondary cooling is strong Degree, guarantees that slab goes out 830 degree of conticaster rear surface temperature.
The invention discloses a kind of smelting processes for improving plate surface quality, smelt composition, high-purity by reasonably adjusting Net steel smelting, hypoxemia nitrogen control of deleterious element, the controls such as reasonable degree of superheat control, covering slag selection, dynamic soft-reduction adjustment, reach To the purpose of optimization cc billet surface quality, to promote rolled plate surface quality, improve plate surface quality.Such as Fig. 1,2, adopt After this method, the annual unqualified incidence in surface reduces system 0.31% by 0.53%, and surface quality is promoted obviously, drops this gain effect Fruit is significant.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (3)

1. a kind of smelting process for improving plate surface quality, it is characterised in that:
S1, its chemical component and mass percent are as follows: C:0.02%~0.60%, Si≤0.20%, Mn:0.30%~2.20%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S≤0.0010% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；Tapping Temperature of Bof 1680~1720 ℃；Converter tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 10~20min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 30~40 DEG C, select suitable protection according to carbon content Slag, it is ensured that liquid slag layer 10~15mm of thickness on the upside of crystallizer, four side liquid slag layer 5~10mm of thickness of crystallizer are adjusted simultaneously Basicity, the viscosity of protection, are adjusted by pulling rate, are guaranteed that dynamic soft-reduction is depressed in horizontal segment, are adjusted secondary cooling intensity, guarantee Slab goes out conticaster rear surface temperature >=800 degree.
2. a kind of smelting process for improving plate surface quality according to claim 1, it is characterised in that:
S1, its chemical component and mass percent are as follows: its chemical component and mass percent are as follows: C:0.02%~0.20%, Si≤0.20%, Mn:1.20%~2.20%, P≤0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤ 0.50%, N≤0.0050%, Ti:0.006%~0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and miscellaneous Matter；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0008% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1696 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 16min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 38 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 13mm, four side liquid slag layer thickness 8mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, is adjusted by pulling rate, is guaranteed that dynamic soft-reduction is depressed in horizontal segment, is adjusted secondary cooling intensity, guarantee that slab goes out conticaster 860 degree of rear surface temperature.
3. a kind of smelting process for improving plate surface quality according to claim 1, it is characterised in that:
S1, its chemical component and mass percent are as follows: C:0.20%~0.60%, Si≤0.20%, Mn:0.30%~1.60%, P ≤ 0.030%, S≤0.0050%, Ni≤0.30%, Nb≤0.070%, Cu≤0.50%, N≤0.0050%, Ti:0.006%~ 0.020%, Cr≤0.30%, Al:0.015%~0.050%, surplus are Fe and impurity；
S2, desulfurization station carry out compound desulfurization using lime and magnesium powder, skim clean after desulfurization, enter S≤0.0020% in furnace molten iron, S:0.0006% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route；1706 DEG C of Tapping Temperature of Bof；Converter Tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and composition meets the requirement of step S1；
S5, RH meet vacuum cycle 20min under vacuum degree≤3mbar, carry out Calcium treatment after vacuum processing, Calcium treatment terminates It is quiet afterwards to stir 13min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 33 DEG C, select suitable covering slag according to carbon content, really Liquid slag layer thickness 12mm, four side liquid slag layer thickness 7mm of crystallizer on the upside of crystallizer are protected, while adjusting the basicity of protection, gluing Degree, is adjusted by pulling rate, is guaranteed that dynamic soft-reduction is depressed in horizontal segment, is adjusted secondary cooling intensity, guarantee that slab goes out conticaster 830 degree of rear surface temperature.
CN201910378655.5A 2019-05-07 2019-05-07 A kind of smelting process improving plate surface quality Pending CN110016604A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910378655.5A CN110016604A (en) 2019-05-07 2019-05-07 A kind of smelting process improving plate surface quality

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910378655.5A CN110016604A (en) 2019-05-07 2019-05-07 A kind of smelting process improving plate surface quality

Publications (1)

Publication Number Publication Date
CN110016604A true CN110016604A (en) 2019-07-16

Family

ID=67193273

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910378655.5A Pending CN110016604A (en) 2019-05-07 2019-05-07 A kind of smelting process improving plate surface quality

Country Status (1)

Country Link
CN (1) CN110016604A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110616377A (en) * 2019-11-06 2019-12-27 湖南华菱湘潭钢铁有限公司 Production method of low-yield-ratio high-toughness Q460GJ
CN110643884A (en) * 2019-10-10 2020-01-03 南京钢铁股份有限公司 Production method of one-steel multi-stage pipeline steel blank
CN110735080A (en) * 2019-10-10 2020-01-31 南京钢铁股份有限公司 Production method of steel multi-stage special container steel blank
CN111455257A (en) * 2020-04-29 2020-07-28 南京钢铁股份有限公司 Control method of steel inclusion for railway bogie
WO2023274222A1 (en) * 2021-06-29 2023-01-05 宝山钢铁股份有限公司 Calcium treatment method for molten steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07138702A (en) * 1993-09-27 1995-05-30 Nippon Steel Corp Sn-containing low carbon hot rolled steel plate good in surface property and its production
CN102041436A (en) * 2010-12-21 2011-05-04 南阳汉冶特钢有限公司 Steel plate for low-alloy high-strength structured steel Q460C and production method thereof
WO2017026125A1 (en) * 2015-08-11 2017-02-16 Ｊｆｅスチール株式会社 Material for high-strength steel sheet, hot rolled material for high-strength steel sheet, material annealed after hot rolling and for high-strength steel sheet, high-strength steel sheet, high-strength hot-dip plated steel sheet, high-strength electroplated steel sheet, and manufacturing method for same
CN108531807A (en) * 2018-04-17 2018-09-14 南京钢铁股份有限公司 A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07138702A (en) * 1993-09-27 1995-05-30 Nippon Steel Corp Sn-containing low carbon hot rolled steel plate good in surface property and its production
CN102041436A (en) * 2010-12-21 2011-05-04 南阳汉冶特钢有限公司 Steel plate for low-alloy high-strength structured steel Q460C and production method thereof
WO2017026125A1 (en) * 2015-08-11 2017-02-16 Ｊｆｅスチール株式会社 Material for high-strength steel sheet, hot rolled material for high-strength steel sheet, material annealed after hot rolling and for high-strength steel sheet, high-strength steel sheet, high-strength hot-dip plated steel sheet, high-strength electroplated steel sheet, and manufacturing method for same
CN108531807A (en) * 2018-04-17 2018-09-14 南京钢铁股份有限公司 A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张继明: "《X90/X100管线钢与钢管显微组织鉴定图谱》", 30 November 2017, 西安：陕西科学技术出版社 *
杨军: "《铸坯成型理论》", 31 March 2015, 北京：冶金工业出版社 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110643884A (en) * 2019-10-10 2020-01-03 南京钢铁股份有限公司 Production method of one-steel multi-stage pipeline steel blank
CN110735080A (en) * 2019-10-10 2020-01-31 南京钢铁股份有限公司 Production method of steel multi-stage special container steel blank
CN110616377A (en) * 2019-11-06 2019-12-27 湖南华菱湘潭钢铁有限公司 Production method of low-yield-ratio high-toughness Q460GJ
CN111455257A (en) * 2020-04-29 2020-07-28 南京钢铁股份有限公司 Control method of steel inclusion for railway bogie
WO2023274222A1 (en) * 2021-06-29 2023-01-05 宝山钢铁股份有限公司 Calcium treatment method for molten steel

Similar Documents

Publication Publication Date Title
CN110016604A (en) A kind of smelting process improving plate surface quality
CN101956040B (en) Producing method of clean steel
CN102260822B (en) Smelting method of high-phosphorus low-sulfur non-oriented electrical steel
CN101343677B (en) Process for manufacturing low-silicon low-carbon deep punching/drawing steel
CN102051530B (en) 48MnV nitrogenous steel and nitrogen adding process thereof
CN102011062B (en) Easy-cutting gear steel and smelting method thereof
CN102618782B (en) Large-specification Z-direction H-steel and preparation method thereof
CN102758051A (en) Method for producing special steel through high-cleanness low-oxygen content process of rotating furnace
KR20130025383A (en) Method for controlling titanium content in ultra-low carbon killed steel
CN102329920A (en) Method for smelting high-aluminum low-silicon ultra pure ferritic stainless steel
CN109881095B (en) grade-B acid-resistant pipeline steel plate and smelting process
CN102002635A (en) Steel for pressure container in thick specification and preparation method thereof
CN102851579A (en) Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and manufacturing method thereof
CN104233064A (en) 170MPa-grade cold-rolled phosphorized IF high-strength steel and production method thereof
CN102851447B (en) Outside-furnace refining production method of steel used in carbon steel welding wire
CN110029287A (en) A kind of production method improving Wide and Heavy Plates surface quality
CN103060523B (en) Smelting method for non-magnetic stainless steel
CN102268615A (en) Engineering steel material with excellent core low-temperature impact toughness and lamellar tearing resisting performance and production method thereof
CN103741007A (en) Production method for reducing gas content in low-carbon aluminum killed steel
CN111778452A (en) Non-oriented electrical steel plate with excellent magnetic property and smelting method thereof
CN106319333B (en) A kind of smelting process of high strength steel v n micro alloying
CN107557534A (en) The production method of extremely low phosphoretic steel
CN110484825A (en) A kind of low cost 355MPa is hot rolled H-shaped and preparation method thereof
CN111304404B (en) Cored wire for oxide metallurgy of vacuum induction furnace and use method
CN110042309A (en) A kind of production method improving wide surface of thin steel sheet quality

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20190716