CN110016626A - A kind of production method improving low Grade Pipeline Steel surface quality - Google Patents

A kind of production method improving low Grade Pipeline Steel surface quality Download PDF

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Publication number
CN110016626A
CN110016626A CN201910374229.4A CN201910374229A CN110016626A CN 110016626 A CN110016626 A CN 110016626A CN 201910374229 A CN201910374229 A CN 201910374229A CN 110016626 A CN110016626 A CN 110016626A
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dephosphorization
temperature
furnace
carry out
heating
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CN110016626B (en
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
赵显鹏
王凡
黄灿
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • 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
    • 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
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a kind of production method for improving low Grade Pipeline Steel surface quality, chemical component and mass percent are as follows: C:0.040%~0.080%, Si:0.10%~0.30%, Mn:1.20%~1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus are Fe and inevitable impurity.Cc billet surface quality is improved by smelting process optimization, adjustment rolling and forming technology improves steel surface iron oxide scale integrity degree, obtains the Pipeline Steel Plate of surface quality highly corrosion resistant, improve product quality.

Description

A kind of production method improving low Grade Pipeline Steel surface quality
Technical field
The present invention relates to iron and steel smelting technology fields, more particularly to a kind of life for improving low Grade Pipeline Steel surface quality Production method.
Background technique
As demand of the world to the energy increases, petroleum pipeline conveying is increasingly pursued by countries in the world, external The steel plate of the market demand mainly uses cruise to transport, the haul-cycle time generally at 1~2 month, ocean surface bad environments, steel plate often by To rainwater even sea water intrusion, steel plate arrives at a station rear surface deterioration, and some possibility influence to use.Currently, pipe line steel uses TMCP rolling mill practice, in order to enhance product performance, zerolling technology is used widely, and rolling reduction results in greatly steel plate Surface deformation is big, and iron scale is often damaged different on the steel plate, and structural transformation is quick in cooling procedure, and internal stress is uneven, Surface of steel plate Stress non-homogeneity is caused, the iron scale that surface of steel plate obtains after temperature correction is imperfect, the ground that iron scale falls off Side is easy to produce corrosion source, so as to cause plate surface quality deterioration.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of producer for improving low Grade Pipeline Steel surface quality Method,
S1, its chemical component and mass percent are as follows: C:0.040%~0.080%, Si:0.10%~0.30%, Mn:1.20%~ 1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005% ~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus be Fe and inevitably it is 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≤0.010% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, Tapping Temperature of Bof 1640~1680 DEG C, tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree≤3mbar, and vacuum cycle 15min carries out Calcium treatment after vacuum processing, and Calcium treatment terminates It is quiet afterwards to stir 15~20min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 15~25 DEG C, are adjusted by pulling rate, and Dynamic Light pressure is shortened Lower pressure range guarantees that dynamic soft-reduction is depressed at 8 sections to 10 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not Dross, conticaster do not carry out secondary chamfering using 34 ° of big chamfer crystallizers to slag, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1100~1110 DEG C of heating temperature, heating time 10~ 12min/cm, soaking time >=50min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, dephosphorization at the beginning of carrying out in dephosphorization case, dephosphorization pressure >=22MPa, slightly 1050~1080 DEG C of start rolling temperature are rolled, roughing guarantees that 2~3 passage of dephosphorization, dephosphorization pressure >=22MPa roll work using the two-stage Skill, 800~920 DEG C of finish rolling start rolling temperature, two passage dephosphorization before finish rolling, dephosphorization pressure >=22MPa, finish rolling end reduction in pass≤ 6mm, enters 750~800 DEG C of coolant-temperature gage, 550~650 DEG C of red temperature by 800~860 DEG C of finishing temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
Technical effect: the present invention breaches prior art constraint, and deterioration surface quality is effectively controlled by smelting process Constituent content has obtained the few high-quality slab of surface purging reconditioning ratio, has reduced iron scale using low temperature austenitizing technique Thickness, rolling cooling technique parameter adjustment change the phenomenon of scale on surface breakage easy to fall off, pass through this method steel plate table Face quality is obviously improved.
The technical solution that the present invention further limits is:
A kind of preceding production method for improving low Grade Pipeline Steel surface quality, grade of steel are 5LB~X65 grades；Blank uses (220~320) mm* (1600~2800) mm section blank, product specification (15~35) mm* (1600~4800) mm.
A kind of preceding production method for improving low Grade Pipeline Steel surface quality, grade of steel are 5LB grades, and blank uses 260mm*2070mm section blank, product specification 15mm*3830mm；
S1, its chemical component and mass percent are as follows: C:0.060%~0.080%, Si:0.20%~0.30%, Mn:1.20%~ 1.40%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005% ~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus be Fe and inevitably it is 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1668 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 22min；
S6, CCM casting are poured using full guard, and 23 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1106 DEG C of heating temperature, heating time 11min/cm, Hot time 55min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1058 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 918 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.6mm, enter by 858 DEG C of finishing temperature 798 DEG C of coolant-temperature gage, 650 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
A kind of preceding production method for improving low Grade Pipeline Steel surface quality, grade of steel are X60M grades, and blank uses 220mm*2070mm section blank, product specification 23.83mm*3890mm；
S1, its chemical component and mass percent are as follows: C:0.040%~0.060%, Si:0.10%~0.30%, Mn:1.30%~ 1.50%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.040%~0.070%, Cr≤0.15%, Mo≤0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus is for Fe and not Evitable 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, turn S:0.006% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1653 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 18min；
S6, CCM casting are poured using full guard, and 18 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1101 DEG C of heating temperature, heating time 12min/cm, Hot time 53min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1068 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 830 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.3mm, enter by 820 DEG C of finishing temperature 765 DEG C of coolant-temperature gage, 601 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
A kind of preceding production method for improving low Grade Pipeline Steel surface quality, grade of steel are X65M grades, and blank uses 320mm*2570mm section blank, product specification 27.2mm*3110mm；
S1, its chemical component and mass percent are as follows: C:0.050%~0.070%, Si:0.15%~0.25%, Mn:1.40%~ 1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.030%~0.070%, Cr:0.15%~0.30%, Mo≤ 0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus are Fe and inevitable 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1669 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 17min；
S6, CCM casting are poured using full guard, and 21 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1107 DEG C of heating temperature, heating time 12.3min/cm, Soaking time 57min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 22MPa, roughing in dephosphorization case 1056 DEG C of start rolling temperature, roughing guarantees 2 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 801 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 4.7mm, enter by 803 DEG C of finishing temperature 753 DEG C of coolant-temperature gage, 560 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
The beneficial effects of the present invention are:
(1) Rational Composition design Surface Quality is most important in the present invention, the higher Surface Quality of Si constituent content influence compared with Greatly, Si element mass fraction is lighter, is easy to be enriched with to casting billet surface, and oxidation reaction can occur for Fe atom in 2 Mo Steel Slab during Heating Process, It is enriched in the Si on surface and iron oxide reacts and easily forms 2FeOSiO2(fayalite), fayalite is in conjunction with steel matrix Preferably, Si≤0.30% is required in the design of Pipeline Steel Plate ingredient；Effectively control N content, addition Ti carry out effective fixed nitrogen, prevent nitrogen In conjunction with Nb element, fragmentation line is generated；The Nb element usage amount upper limit is controlled；The low temperature that Ni element can improve steel grade is tough Property, but excessive addition will increase the viscosity of molten steel, will cause covering slag slag during continuous casting, to cause surface Deterioration；S content is controlled, the influence of manganese sulfide inclusion Surface Quality is avoided；
(2) present invention in by tapping temperature, refining treatment, vacuum measure restriction, effectively increase Cleanliness of Molten Steel, drop The harm of the elements such as low pernicious gas nitrogen, hydrogen, oxygen has achieved the purpose that improve plate surface quality；
(3) stabilization of surface quality is improved, the specification degree of superheat ensure that continuous casting by the improvement of continuous casting working procedure in the present invention Covering slag stabilization of the thickness of molten slag layer and molten condition in casting process, using chamfer crystallizer and carries out at secondary chamfering Reason, avoids the generation of wide and thick slab edge chink, has decreased or even eliminated slab reconditioning and purge, regular shape has good The slab of good oscillation mark provides good basis to form the uniform steel surface iron oxide scale of constant thickness；
(4) for slab in Furnace Production Process, surface can generate rapidly iron scale in the present invention, by reducing heating temperature Degree, effectively reduces and rolls plate iron scale thickness；It reduces by two and opens temperature, effectively reduce steel plate secondary oxidation during the rolling process Degree effectively improves plate surface quality by being used cooperatively dephosphorization means；
(5) using high red temperature, to plate is rolled, cooling back plate shape is advantageous out in the present invention, while avoiding fierce phase transformation and causing Steel plate stress release is not concentrated, and selective oxidation iron sheet is caused to fall off, and destroys scale on surface integrity degree, and steel billet temperature is down to 300 DEG C or less progress temperature corrections are straight, ensure that the flatness of steel plate, improve surface quality stability；
(6) by smelting and the cooperation of rolling process in the present invention, it ensure that the iron scale of production process was generated and removed Uniformity reduces steel surface iron oxide scale thickness, steel surface iron oxide scale integrity degree is improved, to improve product table Face quality meets the requirement of client.
Detailed description of the invention
Fig. 1 is 1 steel surface iron oxide scale thickness chart of embodiment；
Fig. 2 is that embodiment 1 produces plate surface quality figure.
Specific embodiment
Embodiment 1
A kind of production method improving low Grade Pipeline Steel surface quality provided in this embodiment, grade of steel are 5LB grades, and blank uses 260mm*2070mm section blank, product specification 15mm*3830mm.Specifically:
S1, its chemical component and mass percent are as follows: C:0.060%~0.080%, Si:0.20%~0.30%, Mn:1.20%~ 1.40%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005% ~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus be Fe and inevitably it is 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1668 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, it is ensured that and degassing completely, reduces the content of steel water oxygen, nitrogen, hydrogen, Carry out Calcium treatment after vacuum processing, it is quiet after Calcium treatment to stir 22min；
S6, CCM casting are poured using full guard, and 23 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1106 DEG C of heating temperature, heating time 11min/cm, Hot time 55min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1058 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 918 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.6mm, enter by 858 DEG C of finishing temperature 798 DEG C of coolant-temperature gage, 650 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
Embodiment 2
A kind of production method improving low Grade Pipeline Steel surface quality provided in this embodiment, grade of steel are X60M grades, and blank is adopted With 220mm*2070mm section blank, product specification 23.83mm*3890mm.Specifically:
S1, its chemical component and mass percent are as follows: C:0.040%~0.060%, Si:0.10%~0.30%, Mn:1.30%~ 1.50%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.040%~0.070%, Cr≤0.15%, Mo≤0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus is for Fe and not Evitable 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, turn S:0.006% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1653 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, it is ensured that and degassing completely, reduces the content of steel water oxygen, nitrogen, hydrogen, Carry out Calcium treatment after vacuum processing, it is quiet after Calcium treatment to stir 18min；
S6, CCM casting are poured using full guard, and 18 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1101 DEG C of heating temperature, heating time 12min/cm, Hot time 53min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1068 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 830 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.3mm, enter by 820 DEG C of finishing temperature 765 DEG C of coolant-temperature gage, 601 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
Embodiment 3
A kind of production method improving low Grade Pipeline Steel surface quality provided in this embodiment, grade of steel are X65M grades, and blank is adopted With 320mm*2570mm section blank, product specification 27.2mm*3110mm.Specifically:
S1, its chemical component and mass percent are as follows: C:0.050%~0.070%, Si:0.15%~0.25%, Mn:1.40%~ 1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.030%~0.070%, Cr:0.15%~0.30%, Mo≤ 0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus are Fe and inevitable 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1669 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, it is ensured that and degassing completely, reduces the content of steel water oxygen, nitrogen, hydrogen, Carry out Calcium treatment after vacuum processing, it is quiet after Calcium treatment to stir 17min；
S6, CCM casting are poured using full guard, and 21 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1107 DEG C of heating temperature, heating time 12.3min/cm, Soaking time 57min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 22MPa, roughing in dephosphorization case 1056 DEG C of start rolling temperature, roughing guarantees 2 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 801 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 4.7mm, enter by 803 DEG C of finishing temperature 753 DEG C of coolant-temperature gage, 560 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
As shown in Figs. 1-2, the present invention promotes cc billet surface quality by smelting process optimization, adjusts rolling and forming technology To improve steel surface iron oxide scale integrity degree, surface quality height, corrosion resistant Pipeline Steel Plate have been obtained.Annual low level pipeline The unqualified incidence of steel surface is reduced to 0.11% by 0.32%, and surface quality is promoted obviously, and it is significant to drop this gain effect.
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 (5)

1. a kind of production method for improving low Grade Pipeline Steel surface quality, it is characterised in that:
S1, its chemical component and mass percent are as follows: C:0.040%~0.080%, Si:0.10%~0.30%, Mn:1.20%~ 1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005% ~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus be Fe and inevitably it is 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≤0.010% after converter；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, Tapping Temperature of Bof 1640~1680 DEG C, tapping carries out slag making using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree≤3mbar, and vacuum cycle 15min carries out Calcium treatment after vacuum processing, and Calcium treatment terminates It is quiet afterwards to stir 15~20min；
S6, CCM casting are poured using full guard, and the middle packet degree of superheat meets 15~25 DEG C, are adjusted by pulling rate, and Dynamic Light pressure is shortened Lower pressure range guarantees that dynamic soft-reduction is depressed at 8 sections to 10 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not Dross, conticaster do not carry out secondary chamfering using 34 ° of big chamfer crystallizers to slag, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1100~1110 DEG C of heating temperature, heating time 10~ 12min/cm, soaking time >=50min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, dephosphorization at the beginning of carrying out in dephosphorization case, dephosphorization pressure >=22MPa, slightly 1050~1080 DEG C of start rolling temperature are rolled, roughing guarantees that 2~3 passage of dephosphorization, dephosphorization pressure >=22MPa roll work using the two-stage Skill, 800~920 DEG C of finish rolling start rolling temperature, two passage dephosphorization before finish rolling, dephosphorization pressure >=22MPa, finish rolling end reduction in pass≤ 6mm, enters 750~800 DEG C of coolant-temperature gage, 550~650 DEG C of red temperature by 800~860 DEG C of finishing temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
2. a kind of production method for improving low Grade Pipeline Steel surface quality according to claim 1, it is characterised in that: steel Grade is 5LB~X65 grades；Blank uses (220~320) mm* (1600~2800) mm section blank, product specification (15~35) Mm* (1600~4800) mm.
3. a kind of production method for improving low Grade Pipeline Steel surface quality according to claim 2, it is characterised in that: steel Grade is 5LB grades, and blank uses 260mm*2070mm section blank, product specification 15mm*3830mm；
S1, its chemical component and mass percent are as follows: C:0.060%~0.080%, Si:0.20%~0.30%, Mn:1.20%~ 1.40%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb≤0.070%, Cr≤0.30%, Mo≤0.15%, Ti:0.005% ~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus be Fe and inevitably it is 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1668 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 22min；
S6, CCM casting are poured using full guard, and 23 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1106 DEG C of heating temperature, heating time 11min/cm, Hot time 55min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1058 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 918 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.6mm, enter by 858 DEG C of finishing temperature 798 DEG C of coolant-temperature gage, 650 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
4. a kind of production method for improving low Grade Pipeline Steel surface quality according to claim 2, it is characterised in that: steel Grade is X60M grades, and blank uses 220mm*2070mm section blank, product specification 23.83mm*3890mm；
S1, its chemical component and mass percent are as follows: C:0.040%~0.060%, Si:0.10%~0.30%, Mn:1.30%~ 1.50%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.040%~0.070%, Cr≤0.15%, Mo≤0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus is for Fe and not Evitable 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, turn S:0.006% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1653 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 18min；
S6, CCM casting are poured using full guard, and 18 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1101 DEG C of heating temperature, heating time 12min/cm, Hot time 53min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 23MPa, roughing in dephosphorization case 1068 DEG C of start rolling temperature, roughing guarantees 3 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 830 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 5.3mm, enter by 820 DEG C of finishing temperature 765 DEG C of coolant-temperature gage, 601 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
5. a kind of production method for improving low Grade Pipeline Steel surface quality according to claim 2, it is characterised in that: steel Grade is X65M grades, and blank uses 320mm*2570mm section blank, product specification 27.2mm*3110mm；
S1, its chemical component and mass percent are as follows: C:0.050%~0.070%, Si:0.15%~0.25%, Mn:1.40%~ 1.60%, P≤0.015%, S≤0.0030%, Ni≤0.20%, Nb:0.030%~0.070%, Cr:0.15%~0.30%, Mo≤ 0.15%, Ti:0.005%~0.02%, N≤0.0050%, Ca:0.001%~0.003%, Al:0.010%~0.050%, surplus are Fe and inevitable 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, turn S:0.008% after furnace；
S3, steel-making use BOF → LF furnace refining → RH refining → continuous casting process route, 1669 DEG C of Tapping Temperature of Bof, tap Slag making is carried out using pro-molten refining slag+active lime；
S4, molten steel carry out heating slugging after reaching LF furnace, and ingredient meets requirement described in step S1；
S5, RH meet vacuum degree 2mbar, vacuum cycle 15min, carry out Calcium treatment after vacuum processing, after Calcium treatment It is quiet to stir 17min；
S6, CCM casting are poured using full guard, and 21 DEG C of the middle packet degree of superheat is adjusted by pulling rate, are shortened dynamic soft-reduction and are depressed area Between, guarantee that dynamic soft-reduction is depressed at 9 sections, it is ensured that covering slag liquefaction effect guarantees covering slag not slag not dross, continuous casting Machine uses 34 ° of big chamfer crystallizers, while carrying out secondary chamfering, it is ensured that slab quality of edges；
Use stepped heating stove heating after the cold table inspection of S7, blank heap, 1107 DEG C of heating temperature, heating time 12.3min/cm, Soaking time 57min；
S8, slab go out heating furnace and send by the speed of 3m/s to milling train, carry out just dephosphorization, dephosphorization pressure 22MPa, roughing in dephosphorization case 1056 DEG C of start rolling temperature, roughing guarantees 2 passage of dephosphorization, dephosphorization pressure 22MPa, using two-stage rolling mill practice, finish rolling open rolling temperature 801 DEG C of degree, two passage dephosphorization before finish rolling, dephosphorization pressure 22MPa, finish rolling end reduction in pass 4.7mm, enter by 803 DEG C of finishing temperature 753 DEG C of coolant-temperature gage, 560 DEG C of red temperature；
It is straight that S9, steel plate carry out temperature correction after cold bed is cooled to 300 DEG C or less, is put in storage after cutting, mark, flaw detection, table inspection.
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CN110735079A (en) * 2019-10-10 2020-01-31 南京钢铁股份有限公司 Production method of multi-grade steel high-strength steel blank
CN111235489A (en) * 2020-02-17 2020-06-05 柳州钢铁股份有限公司 Method for manufacturing X65MS acid-resistant pipeline steel
CN111254352A (en) * 2020-02-17 2020-06-09 柳州钢铁股份有限公司 X65MS acid-resistant pipeline steel
CN111304426A (en) * 2020-03-31 2020-06-19 湖南华菱湘潭钢铁有限公司 Production method of high-strength steel sheet
CN111455277A (en) * 2020-05-14 2020-07-28 南京钢铁股份有限公司 Production method of extra-low-cost PS L1 thick outlet pipeline steel
CN111519083A (en) * 2020-05-14 2020-08-11 南京钢铁股份有限公司 Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel
CN111530949A (en) * 2020-04-29 2020-08-14 南京钢铁股份有限公司 Control method for surface quality of steel for railway bogie
CN111719084A (en) * 2020-06-15 2020-09-29 南京钢铁股份有限公司 Production method of titanium-containing thick outlet alloy steel with extremely low cost
CN111793768A (en) * 2020-05-15 2020-10-20 南京钢铁股份有限公司 Production method of extremely-low-cost chromium-containing thick outlet pipeline steel
CN111842546A (en) * 2020-07-10 2020-10-30 首钢集团有限公司 Equipment and method for improving TMCP wide and thick plate secondary plate shape
CN113462981A (en) * 2021-07-05 2021-10-01 攀钢集团攀枝花钢铁研究院有限公司 Continuous annealing low alloy steel HC500LA and smelting method thereof

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CN110735079A (en) * 2019-10-10 2020-01-31 南京钢铁股份有限公司 Production method of multi-grade steel high-strength 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
CN111235489A (en) * 2020-02-17 2020-06-05 柳州钢铁股份有限公司 Method for manufacturing X65MS acid-resistant pipeline steel
CN111254352A (en) * 2020-02-17 2020-06-09 柳州钢铁股份有限公司 X65MS acid-resistant pipeline steel
CN111304426A (en) * 2020-03-31 2020-06-19 湖南华菱湘潭钢铁有限公司 Production method of high-strength steel sheet
CN111530949A (en) * 2020-04-29 2020-08-14 南京钢铁股份有限公司 Control method for surface quality of steel for railway bogie
CN111455277A (en) * 2020-05-14 2020-07-28 南京钢铁股份有限公司 Production method of extra-low-cost PS L1 thick outlet pipeline steel
CN111519083A (en) * 2020-05-14 2020-08-11 南京钢铁股份有限公司 Production method of extremely-low-cost manganese-containing thick-specification outlet pipeline steel
CN111793768A (en) * 2020-05-15 2020-10-20 南京钢铁股份有限公司 Production method of extremely-low-cost chromium-containing thick outlet pipeline steel
CN111719084A (en) * 2020-06-15 2020-09-29 南京钢铁股份有限公司 Production method of titanium-containing thick outlet alloy steel with extremely low cost
CN111842546A (en) * 2020-07-10 2020-10-30 首钢集团有限公司 Equipment and method for improving TMCP wide and thick plate secondary plate shape
CN113462981A (en) * 2021-07-05 2021-10-01 攀钢集团攀枝花钢铁研究院有限公司 Continuous annealing low alloy steel HC500LA and smelting method thereof

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