CN110241356A - A kind of welding wire gren rod and preparation method thereof - Google Patents
A kind of welding wire gren rod and preparation method thereof Download PDFInfo
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- CN110241356A CN110241356A CN201910384795.3A CN201910384795A CN110241356A CN 110241356 A CN110241356 A CN 110241356A CN 201910384795 A CN201910384795 A CN 201910384795A CN 110241356 A CN110241356 A CN 110241356A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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- 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
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- 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
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- 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
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- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The present invention provides a kind of welding wire gren rods, belong to iron and steel technical field, the welding wire gren rod, component including following mass percentage: C 0.060~0.080%, Si 0.80~0.85%, Mn 1.50~1.55%, P≤0.015%, S 0.007~0.014%, O 0.015~0.0040%, N≤0.0030%, Ca≤0.0006%, surplus Fe.Welding wire provided by the invention gren rod tensile strength≤535MPa, wire rod tensile strength difference≤40MPa of different heats, poker difference≤35MPa, elongation after fracture 38~46%, the contraction percentage of area 78~86%, the drawing property of wire rod is excellent, substantially not fracture of wire, welding wire Product jointing spatter loss coefficient is low, spatter rate≤4%, weld seam aesthetics is high, and weld seam is smooth.
Description
Technical field
The present invention relates to iron and steel technical fields, and in particular to a kind of welding wire gren rod and preparation method thereof.
Background technique
ER70S-6 is a kind of typical welding steel, is one of widest welding material of purposes.For manufacturing a variety of rule
The copper facing low-alloy steel CO of lattice2The ER70S-6 steel wire rod of gas protecting welding wire Ф 5.5mm will be cold worked by multi-pass, ability
Drawing becomes the welding wire of different size, and since cold deformation is big, steel wire rod will have preferable drawing property；It is simultaneously to keep away
Exempt from finished product welding wire and lead to the problem of in the welding process largely splash, weld seam out-of-flatness occur, steel wire rod will also have good
Welding performance.Therefore, a kind of ER70S-6 welding wire gren rod and production technology are designed, the drawing of ER70S-6 wire rod is improved
Can, welding wire Product jointing spatter loss coefficient be reduced, improves weld seam aesthetics, can satisfy the different demands of user, be steel industry skill
The problem of art personnel's urgent need to resolve.
Summary of the invention
The purpose of the present invention is to provide a kind of welding wire gren rod and production technologies, it is intended to improve the drawing of wire rod
Can, welding wire Product jointing spatter loss coefficient be reduced, improves weld seam aesthetics, can satisfy the different demands of user.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of welding wire gren rods, which is characterized in that the component including following mass percentage:
C0.060~0.080%, Si0.80~0.85%, Mn1.50~1.55%, P≤0.015%, S0.007~0.014%, Cr≤
0.10%, Ni≤0.10%, Cu≤0.10%, Mo≤0.10%, V≤0.01%, T [O] 0.0015~0.0040%, N≤
0.0040%, Ca≤0.0008%, surplus are Fe and impurity.
Preferably, free oxygen content is 0.0010~0.0016wt% in the welding wire gren rod.
The present invention provides the preparation methods of welding wire gren rod described in above-mentioned technical proposal, which is characterized in that including
Following steps:
(1) molten iron and steel scrap are subjected to melting, silicomangan, low calcium ferrosilicon and low nitrogen carburetting is added in tapping process
Agent obtains slightly making steel liquid；
(2) lime, blistering deoxidier, ferrosilicon powder are added in the thick steel-making liquid for obtaining the step (1) and carries out LF refining,
Obtain refining liquid steel；
(3) under coverture effect, refining liquid steel in the step (2) is cast, slab is obtained；
(4) slab in the step (3) is rolled, obtains welding wire gren rod.
Preferably, it is 1570~1610 DEG C, when tapping that the operating parameter of melting, which includes: tapping temperature, in the step (1)
Between be 4~7min；Speed >=0.32%/min of decarburization；
In terms of mass percentage, control tapping molten steel in C0.04~0.06%, P≤0.010%, S0.015~
0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo≤0.10%, V≤0.01%.
In terms of mass percentage, control C0.060~0.070% in the thick steel-making liquid, Si0.80~0.83%,
Mn1.50~1.53%, P≤0.012%, S0.015~0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo
≤ 0.10%, V≤0.01%, surplus are Fe and impurity.
Preferably, in the step (1), the mass ratio of molten iron and steel scrap is (80~95): (13~28)；
The silicomangan includes the component of following mass percentage: Mn63~70%, Si22.0~25.0%, C≤
0.7%, P≤0.15%, S≤0.04%；
The low calcium ferrosilicon includes the component of following mass percentage: Si74~80%, Al≤0.03%, Ca≤
0.03%, Mn≤0.10%, Cr≤0.10%, P≤0.020%, S≤0.04%, C≤0.020%, Ti≤0.015%, surplus
For Fe and impurity.
Preferably, the lime includes the component of following mass percentage: CaO >=85%, MgO≤5%, SiO2≤
3.5%, S≤0.100%, surplus are impurity；Igloss amount≤7%, the activity degree >=250mL of the lime；
Lime, ferrosilicon powder, Silicon carbide addition account for the matter that quality of molten steel is slightly refined in the step (1) in the step (2)
Measuring percentage is respectively 0.65~0.85%, 0.05~0.0.07%, 0.04~0.06%.Control the entire refining process of refining slag
For greyish white scoriform state, it is ensured that control refining finishing slag R1.2~1.6, MnO+FeO < 1%,
Preferably, the total duration refined in the step (2) is 42~46min, wherein the time of soft blow is 14 after refining
~16min；
In terms of mass percentage, control C0.060~0.080% in the refining liquid steel, Si0.80~0.85%,
Mn1.50~1.55%, P≤0.015%, S0.007~0.014%, [O] 0.0010~0.0016%, N≤0.0027%, Ca
≤ 0.0006%, surplus is Fe and impurity.
Preferably, in the step (3) coverture include following mass percentage component: CaO30~45%,
SiO225~35%, Al2O38~15%, MgO2~5%, remaining is inevitable impurity；The dosage of the coverture is in
Not exposed packet liquid level is standard.
Preferably, the operating parameter cast in the step (3) includes: that the degree of superheat of tundish molten steel is 15~25 DEG C,
The temperature of tundish molten steel is 1530~1540 DEG C；Crystallizer liquid slag layer with a thickness of 10~15mm, the aligning target temperature of slab
Degree is 930~990 DEG C.
Preferably, the operating parameter rolled in the step (4) includes: that the start rolling temperature of slab is 980~1030 DEG C, casting
The head and tail temperature of base is poor≤and 40 DEG C, final rolling temperature is 850~880 DEG C, and laying temperature is 820~840 DEG C；
Air-cooled roller-way is 16 sections, and first section base speed is 0.18m/s；
The length that the length of the air-cooled roller-way is respectively as follows: paragraph 1 roller-way is 5.5 meters；In 2nd~16 section of roller-way, every section
The length of roller-way is 7.5 meters；
The advanced rate that the advanced rate of the air-cooled roller-way is respectively as follows: the 1st~10 section of roller-way is 5%, the 11st~14 section of roller-way
Advanced rate be 10%, the advanced rate of roller-way is 15% after the 14th section.
The present invention provides a kind of welding wire gren rod, the component including following mass percentage: C0.060~
0.080%, Si0.80~0.85%, Mn1.50~1.55%, P≤0.015%, S0.007~0.014%, T [O] 0.0015~
0.0040%, N≤0.0040%, Ca≤0.0008%, surplus Fe.Surplus is Fe.Reasonable C, Si, Mn, Ca, total oxygen (T
[O]), N content reduces the tensile strength of wire rod and reduces the spatter rate of finished product welding wire；Suitable S content improves
The aesthetics of weld seam.Welding wire provided by the invention greatly reduces drawing difficulty and spatter loss coefficient with gren rod, improves weldering
The aesthetics of seam.As shown in embodiment test result, tensile strength≤535MPa of welding wire gren rod provided by the invention,
Wire rod tensile strength difference≤40MPa of different heats, poker difference≤35MPa, elongation after fracture 38~46%, the contraction percentage of area 78
~86%, fracture of wire, welding wire spatter rate≤4%, weld seam be not smooth substantially for the drawing of wire rod.It follows that the present invention provides
Welding wire optimized with gren rod properties, greatly reduce wire rod drawing difficulty and spatter rate, improve
Weld seam aesthetics.
The present invention also provides the preparation methods of the welding wire gren rod, comprising the following steps: (1) by molten iron and useless
Steel carries out melting, and silicomangan, low calcium ferrosilicon and low nitrogen carburant are added in tapping process, obtains slightly making steel liquid；(2) by institute
It states and lime, blistering deoxidier, ferrosilicon powder progress LF refining is added in the thick steel-making liquid that step (1) obtains, obtain refining liquid steel；
(3) under coverture effect, refining liquid steel in the step (2) is cast, slab is obtained；It (4) will be in the step (3)
Slab is rolled, and welding wire gren rod is obtained.The preparation method of welding wire steel wire rod provided by the invention is easy to operate, consumes energy
Low, suitable industrialized production.
Specific embodiment
The present invention provides a kind of welding wire gren rod, the component including following mass percentage: C0.060~
0.080%, Si0.80~0.85%, Mn1.50~1.55%, P≤0.015%, S0.007~0.014%, Cr≤0.10%,
Ni≤0.10%, Cu≤0.10%, Mo≤0.10%, V≤0.01%, T [O] 0.0015~0.0040%, N≤0.0040%,
Ca≤0.0008%, surplus are Fe and impurity.
In the present invention, the welding wire gren rod, preferably includes the component of following mass percentage: C0.061~
0.0069%, Si0.79~0.84%, Mn1.50~1.55%, P≤0.015%, S0.012~0.014%, T [O] 0.015~
0.0040%, N0.0001~0.0019%, Ca0.0001~0.0006%, surplus are Fe and impurity.
The present invention reduces the weldering of wire rod drawing difficulty and finished product welding wire by the reasonable control to each chemical element content
Spatter loss coefficient is connect, the aesthetics of weld seam is improved.Tensile strength≤535MPa of wire rod, the wire rod tensile strength of different heats is poor≤
40MPa, poker difference≤35MPa, the drawing of elongation after fracture 38~46%, the contraction percentage of area 78~86%, wire rod are substantially continuous
Silk, welding wire spatter rate≤4%, weld seam are smooth.
The present invention provides the preparation methods of welding wire gren rod described in above-mentioned technical proposal, comprising the following steps:
(1) molten iron and steel scrap are subjected to melting, silicomangan, low calcium ferrosilicon and low nitrogen carburetting is added in tapping process
Agent obtains slightly making steel liquid；
(2) lime, blistering deoxidier, ferrosilicon powder are added in the thick steel-making liquid for obtaining the step (1) and carries out LF refining,
Obtain refining liquid steel；
(3) under coverture effect, refining liquid steel in the step (2) is cast, slab is obtained；
(4) slab in the step (3) is rolled, obtains welding wire gren rod.
Molten iron and steel scrap are carried out melting by the present invention, and silicomangan, low calcium ferrosilicon and low nitrogen are added in tapping process and increases
Carbon agent obtains slightly making steel liquid.In the present invention, specifically, being that molten iron and steel scrap are added in converter to carry out melting, in converter
In fusion process, whole argon bottom-blowing, petticoat pipe sealing, the speed decarburization with >=0.32%/min, using being generated in decarbonizing process
Intensive CO and CO2Bubble carries denitrogenation, prevents slag getting dry in the melting later period, and the number re-blow is no more than 1 time, before tapping
Ladle argon gas empties 1~3min, and the tapping time is 4~7min and there is not allowed that diffusing, obtained after the completion of melting tapping molten steel and
Ladle slag blanket；In terms of mass percentage, control tapping molten steel in C0.04~0.06%, P≤0.010%, S0.015~
0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo≤0.10%, V≤0.01%, surplus are Fe and impurity.
Control the ladle thickness of slag layer≤40mm；Silicomangan, low calcium ferrosilicon and low nitrogen carburant are added in tapping process to obtain
Thick steel-making liquid；In terms of mass percentage, control C0.060~0.070% in the thick steel-making liquid, Si0.80~0.83%,
Mn1.50~1.53%, P≤0.012%, S0.015~0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo
≤ 0.10%, V≤0.01%, surplus are Fe and impurity.
The present invention is sealed by argon bottom-blowing whole in fusion process, petticoat pipe, and the melting later period prevent slag getting dry,
The increase that number of re-blowing is no more than 1 time, the emptying of ladle argon gas and control tapping time can greatly reduce N content before tapping is several
Rate is conducive to the N content for controlling thick steel-making liquid.
The present invention for the molten iron and steel scrap ingredient in addition to S, P, Cr, Ni, Cu member are known as particular determination, other elements
It is not particularly limited, using molten iron well known in the art and steel scrap.In the present invention, the molten iron preferably includes following matter
Measure percentage composition component: P≤0.120%, S0.020~0.030%, Cr≤0.20%, Ni≤0.10%, Cu≤0.15%,
As≤0.020%, surplus be Fe and impurity, more preferably P0.100~0.110%, S0.020~0.030%, Cr≤
0.03%, Ni≤0.03%, Cu≤0.03%, As≤0.02%, surplus are Fe and impurity；
In the present invention, S0.015~0.030wt%, P≤0.040wt% are preferably controlled in the ingredient of the steel scrap, more
Preferably S0.018~0.028wt%, P≤0.035wt%.In the present invention, the thickness of the steel scrap is preferably≤20mm, more
Preferably 10~20mm, most preferably 15~20mm.In the present invention, the mass ratio of the molten iron and steel scrap be preferably (80~
95): (13~28), more preferably (83~92): (16~25), most preferably (85~90): (18~23).The present invention passes through control
The mass ratio of molten iron and steel scrap processed can reduce the nitrogen content brought into steel scrap.
In the present invention, the silicomangan preferably includes following mass percentage component: Mn63~70%, Si22.0
~25.0%, C≤0.7%, P≤0.15%, S≤0.040%, more preferably Mn65~70%, Si22.5~24.5%, C≤
0.6%, P≤0.10%, S≤0.03%, most preferably Mn67~70%, Si23~24%, C0.01~0.55%, P0.01~
0.10%, S0.005~0.025%.In the present invention, the low calcium ferrosilicon preferably includes following mass percentage component: Si74
~80%, Al≤0.03%, Ca≤0.030%, Mn≤0.10%, Cr≤0.10%, P≤0.020%, S≤0.040%, C≤
0.020%, Ti≤0.015%, surplus are Fe and inevitable impurity, more preferably Si75~80%, Al≤0.25%, Ca
≤ 0.025%, Mn≤0.08%, Cr≤0.08%, P≤0.15%, S≤0.035%, C≤0.015%, Ti≤0.010%,
Surplus is Fe and inevitable impurity.In the present invention, the low nitrogen carburant preferably includes following mass percentage group
Point: C >=95%, N≤100ppm, surplus are impurity, and more preferably C95~99%, N1~100ppm, surplus are impurity.This hair
The bright additional amount for the silicomangan, low calcium ferrosilicon and low nitrogen carburant is not particularly limited, and can guarantee the thick refining
The content of C, Si and Mn are respectively C0.06~0.070%, Si0.80~0.83%, Mn1.50~1.53% in molten steel.
It obtains after slightly making steel liquid, lime, blistering deoxidier, ferrosilicon powder are added in the thick steel-making liquid and carries out LF by the present invention
Refining, obtains refining liquid steel.In the present invention, specifically, thick refining is added into the ladle equipped with thick steel-making liquid at refining initial stage
0.05~0.07% blistering of thick refining quality of molten steel is added after lime fusing in the lime of quality of molten steel 0.65~0.85%
Deoxidier and 0.04~0.06% ferrosilicon powder, carry out top of the slag diffusive deoxidation, with control the entire refining process of refining slag be it is greyish white
Scoriform state, it is ensured that control refining finishing slag R1.2~1.6, FeO+MnO < 1%, in molten steel free oxygen content ([O]) be 0.008~
0.014wt%；Micro-positive pressure in furnace is kept in refining heating process；The total duration of refining is 42~46min；It is whole in refining
In, it is advisable to there is a small amount of flue dust to emerge at steel ladle edge and refining furnace eyeshade gap, avoids molten steel from seething, soft blow after refining
Journey is advisable with molten steel liquid fluctuating without exposed molten steel, and the soft blow time is 14~16min after control refining, it is ensured that controls the essence
The chemical composition content of eight kinds of elements of C, Si, Mn, P, S, O, N, Ca respectively reaches in steel-making liquid: C0.060~0.075%,
Si0.80~0.85%, Mn1.50~1.55%, P≤0.015%, S0.007~0.014%, [O] 0.0010~0.0016%,
N≤0.0030% and the range of Ca≤0.0006%.
In the present invention, the lime preferably include component CaO >=85% of following mass percentage, MgO≤5%,
SiO2≤ 3.5%, S≤0.100%, surplus are impurity, more preferably CaO85~94%, MgO0.01~5%, SiO20.01~
3.5%, S0.01~0.100%.In the present invention, the igloss amount of the lime is preferably≤7%, more preferably 0.5~7%,
Most preferably 2~6%.In the present invention, the activity degree of the lime preferably >=250mL, more preferably 260~280mL, most
Preferably 300~350mL.
In the present invention, the blistering deoxidier preferably includes SiC.Present invention spy no for the ingredient of the ferrosilicon powder
It is different to limit, using ferrosilicon powder well known in the art.
Lime is added in the present invention in refining process, so that the control refining basicity of slag in refining process, is conducive to absorption
Field trash in molten steel, while realizing the control to Ca content；It is greyish white scoriform state by control refining slag, keeps its color close
In white, the oxidisability of refining slag is reduced, is conducive to deoxidation, desulfurization and dross inclusion adsorption, to improve Molten Steel Cleanliness；This hair
It is bright in refining process control molten steel face do not fluctuate with it is exposed, and refine after soft blow process be advisable with molten steel liquid fluctuating, one
Aspect can be avoided molten steel oxygen uptake and inhale nitrogen, and being on the other hand also avoided that refining slag is involved in molten steel makes not to be refined slag absorption
Field trash in calcium content rise, and eventually lead in slab Ca content and increase.After the present invention is refined by control when soft blow
Between be 14~16min, the field trash in molten steel can be removed to the greatest extent；By controlling free oxygen content in refining liquid steel,
Advantageously reduce the total oxygen content in slab.
After obtaining refining liquid steel, the refining liquid steel is cast under coverture effect, obtains slab by the present invention.
In the present invention, specifically, being that the refining liquid steel is carried out full guard casting, tundish argon gas is emptied into 1~3min, greatly
Packet using band argon gas-sealed long nozzle, tundish it is preferable to use submersed nozzle, ladle is opened pour after, do not revolved in pouring basket liquid level
Coverture is added when stream and covers entire pouring basket liquid level；The degree of superheat for controlling tundish molten steel is 15~25 DEG C, i.e., intermediate Baogang
The temperature control of liquid is 1530~1540 DEG C；Control crystallizer slag blanket with a thickness of 10~15mm, M-EMS frequency
For 3Hz, stir current 300A, end electromagnetic agitation frequency is 8Hz, stir current 280A, controls secondary cooling specific water
For 1.1L/kg；The pulling rate of slab is 2.0m/min, and the aligning target temperature of slab is 930~990 DEG C, and the present invention passes through control
The degree of superheat of intermediate tundish molten steel is 15~25 DEG C, crystallizer slag blanket with a thickness of 10~15mm, M-EMS frequency
Rate is 3Hz, stir current 300A, and end electromagnetic agitation frequency is 8Hz, stir current 280A, it is therefore an objective to reduce chemistry at
Divide segregation, while absorption of the molten steel to nitrogen and oxygen can be reduced.
In the present invention, the coverture is preferably low alkalinity low-carbon coverture, and the coverture includes following quality hundred
Divide the component of content: CaO30~45%, SiO225~35%, Al2O38~15%, MgO2~5%, surplus are inevitable miscellaneous
Matter, more preferably CaO35~40%, SiO227~33%, Al2O310~13%, MgO3~4%, surplus are inevitable miscellaneous
Matter.
After obtaining slab, the present invention rolls the slab, obtains welding wire gren rod.In the present invention, institute
It states rolling and the slab is preferably heated to 980~1030 DEG C, the head and tail temperature difference for controlling slab is preferably≤40 DEG C, then
Carry out de-scaling, it is thick in roll, 2 groups of Water in Water Tank carry out finish rolling under the conditions of being cooled to 850~880 DEG C after pre- finish rolling, then pass through 5 groups of water tanks
Water cooling is cooled down on air-cooled roller-way later to spinning under the conditions of 820~840 DEG C.In the present invention, the cooling is preferably logical
It crosses 5 groups of water tanks to be cooled down, control laying temperature is 820~840 DEG C, more preferably 825~835 DEG C；Control air-cooled roller-way 16
Section, first section base speed is preferably 0.18m/s；The length that the length of the air-cooled roller-way is preferably respectively as follows: paragraph 1 roller-way is 5.5 meters；
In 2nd~16 section of roller-way, the length of every section of roller-way is 7.5 meters；The advanced rate of the air-cooled roller-way is preferably respectively as follows: the 1st~10
The advanced rate of section roller-way is 5%, and the advanced rate of the 11st~14 section of roller-way is 10%, and the advanced rate of roller-way is after the 14th section
15%；It is cooling uniform to be conducive to raising wire rod by the length, first section base speed and advanced rate of the air-cooled roller-way of control by the present invention
Property, it is ensured that stocking even tissue reduces tensile strength, improves elongation and section expansion and contraction.
In the present invention, the mode of the de-scaling is preferably high-pressure water descaling, and after the slab is heated, surface can be generated
A large amount of iron scales, if handling without high-pressure water descaling, iron scale is rolled into matrix and can bring to stocking surface in the operation of rolling
Defect.In the present invention, it is described it is thick in be rolled with normal deformation occur conducive to metal, to reduce tensile strength, improve elongation
With section expansion and contraction.
The present invention, in gren rod preparation process, passes through the raw material type added in each step of control and operation in welding wire
Parameter, the reasonable control of each chemical element content, reduces the spatter rate of wire rod drawing difficulty and finished product welding wire, improves
The aesthetics of weld seam.Tensile strength≤535MPa of wire rod, wire rod tensile strength difference≤40MPa of different heats, poker is poor≤
35MPa, elongation after fracture 38~46%, the contraction percentage of area 78~86%, the drawing of wire rod not fracture of wire, welding wire spatter substantially
Rate≤4%, weld seam are smooth.It can be seen that the present invention provides a kind of new selection for welding wire steel wire rod technical field, for welding wire
A new direction and new approaches have been guided in the improvement of steel wire rod manufacture craft.
In the present invention, the smelting condition of welding wire gren rod preferably includes: being refined using 80t converter smelting, 80tLF
Furnace, 6 machines/6 strand casting machines (R9m, 160mm*160mm)；Process flow includes converter smelting process, LF furnace refining procedure, continuous casting
Process and rolling process.
Below in conjunction with the embodiment in the present invention, the technical solution in the present invention is clearly and completely described.It is aobvious
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Embodiment 1
(1) converter smelting process: molten iron and steel scrap being added in converter and carry out melting, whole BOTTOM ARGON BLOWING in fusion process
Gas, petticoat pipe sealing, with the speed decarburization of 0.32%/min, utilizes the intensive CO and CO generated in decarbonizing process2Bubble carries de-
Nitrogen prevents slag getting dry in the melting later period, and without re-blowing, tapping temperature is 1570 DEG C, is tapped, is being tapped using continuous turnover ladle
Preceding ladle argon gas empties 1min, and the tapping time is 4min, does not occur diffusing and obvious slag, tap 82t in tapping process；
Ladle slag blanket and tapping molten steel are obtained after the completion of melting, are controlled the ladle thickness of slag layer≤40mm, are controlled the tapping molten steel
Middle C0.041wt%, P0.008wt%, S0.015%, Cr0.05%, Ni0.03%, Cu0.02%, Mo0.002%,
V0.003%；
Add silicomangan, low calcium ferrosilicon and low nitrogen carburant in tapping process and tentatively adjust chemical component, is slightly refined
Molten steel, control C0.060wt%, Si0.80wt% in thick steel-making liquid, Mn1.50wt%, P0.008wt%, S0.015wt%,
Cr0.05%, Ni0.03%, Cu0.02%, Mo0.002%, V0.003%, surplus are Fe and impurity；
Molten iron includes the component of following mass percentage: P0.098%, S0.020%, Cr0.08%, Ni0.05%,
Cu0.02%, Mo0.01%, V0.006%, surplus are Fe and impurity；S0.019wt%, P0.021wt% in steel scrap, surplus are
Fe and impurity；The steel scrap with a thickness of 12mm；It is described enter furnace molten iron and steel scrap mass percent be 83:17；
(2) LF furnace refining procedure: refining initial stage is added into the thick steel-making liquid 533kg lime, 32.8kg blister take off
Oxygen agent and 41kg ferrosilicon powder, holding refining slag are greyish white scoriform state；Micro-positive pressure in furnace is kept in refining heating process, refining is total
Shi Changwei 42min, wherein soft blow 14min after refining；In refining whole process, molten steel is avoided to seethe, soft blow process after refining
Molten steel liquid fluctuating obtains refining liquid steel and basicity is the refining that 1.20, (FeO%+MnO%) is 0.93% without exposed molten steel
Finishing slag；Taken before upper steel casting after refining steel sample carry out chemical component and the analysis of gas N content, take refining slag specimen carry out chemistry at
Analysis carries out molten steel free oxygen content ([O]) measurement using apparatus for determination of oxygen device, and refining liquid steel chemical component is in terms of quality percentage
Are as follows: C0.064%, Si0.81%, Mn1.52%, P0.009%, S0.008%, Cr0.05%, Ni0.03%, Cu0.02%,
Mo0.002%, V0.003%, Ca0.0003%, [O] 0.0016%, N0.0030%；
(3) continuous casting working procedure: carrying out full guard casting for the refining liquid steel, and tundish argon gas is emptied 3min, big to wrap
After pouring using with argon gas-sealed long nozzle, ladle is opened, it is entire intermediate that coverture covering is added when pouring basket liquid level does not have eddy flow
Packet liquid level, the degree of superheat of tundish molten steel are 17 DEG C, i.e. the temperature control of tundish molten steel is 1532 DEG C；The thickness of crystallizer slag blanket
Degree is 14mm, and the frequency of M-EMS is 3Hz, stir current 300A, and the frequency of end electromagnetic agitation is 8Hz, stirs
The electric current mixed is 280A, and secondary cooling specific water is 1.1L/kg, and the straightening temperature of slab is 941 DEG C；
(4) rolling process: being heated to 980 DEG C for the slab, and the head and tail temperature difference for controlling slab is 38 DEG C, then carries out
High-pressure water descaling, it is thick in roll, 2 groups of Water in Water Tank carry out finish rolling under the conditions of being cooled to 850 DEG C after pre- finish rolling, then by 5 groups of water tanks into
Row cooling, control laying temperature are 820 DEG C, and the blower on air-cooled line is all closed, and cover whole insulation covers, control air-cooled roller-way
It is 16 sections, first section base speed is 0.18m/s, and the length that the length of each section of air-cooled roller-way is respectively as follows: paragraph 1 roller-way is 5.5 meters；2nd
In~16 sections of roller-ways, the length of every section of roller-way is 7.5 meters；The advanced rate of air-cooled roller-way is respectively as follows: the advanced of the 1st~10 section of roller-way
Rate is 5%, and the advanced rate of the 11st~14 section of roller-way is 10%, and the advanced rate of roller-way is 15% after the 14th section, obtains welding wire use
Gren rod ER70S-6；
Through testing analysis to gren rod, the weight percent of chemical component are as follows: C0.065%, Si0.80%,
Mn1.52%, P0.010%, S0.009%, Cr0.05%, Ni0.03%, Cu0.02%, Mo0.002%, V0.003%,
Ca0.0006%, T [O] 0.0035%, N0.0035%, surplus are Fe and impurity；Its mechanical performance index are as follows: tensile strength is
526MPa, elongation 39%, the contraction percentage of area 78%.
Embodiment 2
(1) converter smelting process: molten iron and medium-sized steel scrap being added in converter and carry out melting, whole bottom in fusion process
Wind drift amount is the argon gas of 400Nm3/h, and petticoat pipe sealing is close using what is generated in decarbonizing process with the speed decarburization of 0.35%/min
Collect CO and CO2Bubble carries denitrogenation, prevents slag getting dry in the melting later period, and without re-blowing, tapping temperature is 1591 DEG C, using continuous
Ladle tapping is had enough to meet the need, ladle argon gas empties 2min before tapping, and the tapping time is 5min, does not occur diffusing and bright in tapping process
Aobvious slag, tap 82t；Ladle slag blanket and tapping molten steel are obtained after the completion of melting, control the ladle thickness of slag layer≤
40mm, control C0.052wt%, P0.009wt% in the tapping molten steel, S0.025wt%, Cr0.04%, Ni0.03%,
Cu0.02%, Mo0.002%, V0.003%；Silicomangan, low calcium ferrosilicon, the adjustment of low nitrogen carburant are added in tapping process
Chemical component obtains slightly making steel liquid, control C0.063wt%, Si0.81wt% in thick steel-making liquid, Mn1.50wt%,
P0.009wt%, S0.025wt%, Cr0.04%, Ni0.03%, Cu0.02%, Mo0.002%, V0.003%, surplus Fe
And impurity；
Molten iron includes the component of following mass percentage: P0.11%, S0.030%, Cr0.08%, Ni0.05%,
Cu0.02%, Mo0.01%, V0.006%, surplus are Fe and impurity；S0.024wt%, P0.030wt% in steel scrap, surplus are
Fe and impurity；The steel scrap with a thickness of 16mm；The mass percent 85:15 of the furnace molten iron and steel scrap；
(2) LF furnace refining procedure: refining initial stage be added into thick steel-making liquid 615kg lime, 41kg blistering deoxidier and
49.2kg ferrosilicon powder, holding refining slag are greyish white scoriform state；Micro-positive pressure in furnace is kept in refining heating process, refines total duration
For 44min, wherein soft blow 14min after refining；In refining whole process, molten steel is avoided to seethe, soft blow process molten steel after refining
Liquid fluctuating obtains refining liquid steel and basicity is that the refining that 1.45, (FeO%+MnO%) is 0.70% is whole without exposed molten steel
Slag takes steel sample to carry out chemical component and the analysis of gas N content, refining slag specimen is taken to carry out chemical component after refining before upper steel casting
Analysis carries out molten steel free oxygen content ([O]) measurement using apparatus for determination of oxygen device, and refining liquid steel chemical component is in terms of quality percentage:
C0.072%, Si0.83%, Mn1.52%, P0.010%, S0.010%, Cr0.04%, Ni0.03%, Cu0.02%,
Mo0.002%, V0.003%, Ca0.0006%, [O] 0.0010%, N0.0031%, surplus are Fe and impurity；
(3) continuous casting working procedure: carrying out full guard casting for the refining liquid steel, and tundish argon gas is emptied 3min, big to wrap
After pouring using with argon gas-sealed long nozzle, ladle is opened, it is entire intermediate that coverture covering is added when pouring basket liquid level does not have eddy flow
Packet liquid level, control molten steel liquidus curve are 1515 DEG C, and the degree of superheat of tundish molten steel is 20 DEG C, i.e. the temperature control of tundish molten steel
It is 1535 DEG C；Crystallizer slag blanket with a thickness of 13mm, the frequency of M-EMS is 3Hz, stir current 300A, end
The frequency of electromagnetic agitation is 8Hz, the electric current of stirring is 280A, and secondary cooling specific water is 1.1L/kg, and the straightening temperature of slab is
950℃；
(4) rolling process: being heated to 1030 DEG C for the slab, control slab head and tail temperature difference be 39 DEG C, then into
The de-scaling of horizontal high voltage water, it is thick in roll, 2 groups of Water in Water Tank carry out finish rolling under the conditions of being cooled to 880 DEG C after pre- finish rolling, then pass through 5 groups of water tanks
It is cooled down, control laying temperature is 840 DEG C, and the blower on air-cooled line is all closed, and covers whole insulation covers, controls air-cooled roller
Road is 16 sections, and first section base speed is 0.18m/s, and the length that the length of each section of air-cooled roller-way is respectively as follows: paragraph 1 roller-way is 5.5 meters；The
In 2~16 sections of roller-ways, the length of every section of roller-way is 7.5 meters；The advanced rate of air-cooled roller-way is respectively as follows: the super of the 1st~10 section of roller-way
Antecedent is 5%, and the advanced rate of the 11st~14 section of roller-way is 10%, and the advanced rate of roller-way is 15% after the 14th section, obtains welding wire
With gren rod ER70S-6；
Through testing analysis to gren rod, the weight percent of chemical component are as follows: C0.071%, Si0.84%,
Mn1.52%, P0.010%, S0.010%, T [O] 0.0028%, N0.0040%, Ca0.0008%, surplus are Fe and impurity；
Its mechanical performance index are as follows: tensile strength 516MPa, elongation 41%, the contraction percentage of area 81%.
Embodiment 3
(1) converter smelting process: molten iron and medium-sized steel scrap being added in converter and carry out melting, whole bottom in fusion process
Blowing argon gas, petticoat pipe sealing, with the speed decarburization of 0.35%/min, utilizes the intensive CO and CO generated in decarbonizing process2Bubble is taken
Band denitrogenation prevents slag getting dry in the melting later period, and without re-blowing, tapping temperature is 1610 DEG C, is tapped using continuous turnover ladle,
Ladle argon gas empties 3min before tapping, and the tapping time is 7min, does not occur diffusing and obvious slag in tapping process, tap is
82t；Ladle slag blanket and tapping molten steel are obtained after the completion of melting, are controlled the ladle thickness of slag layer≤40mm, are controlled the tapping
C0.058wt%, P0.012wt%, S0.020wt% in molten steel；205kg lime, silicomangan and low are added in tapping process
Calcium ferrosilicon simultaneously tentatively adjust chemical component, obtain slightly make steel liquid, control slightly make steel liquid in C0.060wt%, Si0.83wt%,
Mn1.51wt%, P0.014wt%, S0.020wt%, Cr0.03%, Ni0.03%, Cu0.02%, Mo0.002%,
V0.003%, surplus are Fe and impurity；
Molten iron includes the component of following mass percentage: P0.113%, S0.025%, Cr0.05%, Ni0.05%,
Cu0.02%, Mo0.01%, V0.008%, surplus are Fe and impurity；S0.027wt%, P0.038wt%, surplus are in steel scrap
Fe and impurity；The steel scrap with a thickness of 19mm；It is described enter furnace molten iron and steel scrap mass percent be 89:11；
(2) 697kg lime, 49.2kg blistering deoxidier LF furnace refining procedure: are added into thick steel-making liquid at refining initial stage
With 57.4kg ferrosilicon powder, holding refining slag is greyish white scoriform state；Micro-positive pressure in furnace is kept in refining heating process, when refining total
A length of 46min, wherein soft blow 14min after refining；In refining whole process, molten steel is avoided to seethe, soft blow process steel after refining
Liquid liquid fluctuating obtains refining liquid steel and basicity is the refining that 1.60, (FeO%+MnO%) is 0.5% without exposed molten steel
Finishing slag, taken before upper steel casting after refining steel sample carry out chemical component and the analysis of gas N content, take refining slag specimen carry out chemistry at
Analysis carries out molten steel free oxygen content ([O]) measurement using apparatus for determination of oxygen device, and ladle chemistry is after refining with quality percentage
Meter: C0.077%, Si0.85%, Mn1.54%, P0.012%, S0.013%, Cr0.03%, Ni0.03%, Cu0.02%,
Mo0.002%, V0.003%, Ca0.0004%；[O] 0.00013%, N0.0033%, surplus are Fe and impurity；
(3) continuous casting working procedure: carrying out full guard casting for the refining liquid steel, and tundish argon gas is emptied 3min, big to wrap
After pouring using with argon gas-sealed long nozzle, ladle is opened, it is entire intermediate that coverture covering is added when pouring basket liquid level does not have eddy flow
Packet liquid level, the degree of superheat of tundish molten steel are 23 DEG C, i.e. the temperature control of tundish molten steel is 1538 DEG C；The thickness of crystallizer slag blanket
Degree is 12mm, and the frequency of M-EMS is 3Hz, stir current 300A, and the frequency of end electromagnetic agitation is 8Hz, stirs
The electric current mixed is 280A, and secondary cooling specific water is 1.1L/kg, and the straightening temperature of slab is 980 DEG C；
(4) slab is heated to 1015 DEG C, the head and tail temperature difference for controlling slab is 40 DEG C, then carries out high pressure water and removes
Squama, it is thick in roll, 2 groups of Water in Water Tank carry out finish rolling under the conditions of being cooled to 865 DEG C after pre- finish rolling, are then cooled down by 5 groups of water tanks, control
Laying temperature processed is 830 DEG C, and the blower on air-cooled line is all closed, and covers whole insulation covers, controls air-cooled roller-way and be no less than 16
Section, first section base speed are 0.18m/s, and the length that the length of each section of air-cooled roller-way is respectively as follows: paragraph 1 roller-way is 5.5 meters；2nd~16
In section roller-way, the length of every section of roller-way is 7.5 meters；The advanced rate that the advanced rate of air-cooled roller-way is respectively as follows: the 1st~10 section of roller-way is
5%, the advanced rate of the 11st~14 section of roller-way is 10%, and the advanced rate of roller-way is 15% after the 14th section, obtains welding wire hot rolling
Wire rod ER70S-6；
Through testing analysis to gren rod, the weight percent of chemical component are as follows: C0.079%, Si0.85%,
Mn1.54%, P0.013%, S0.012%, Cr0.03%, Ni0.03%, Cu0.02%, Mo0.002%, V0.003%,
Ca0.0006%, T [O] 0.0032%, N0.0035%, surplus are Fe and impurity；Its mechanical performance index are as follows: tensile strength is
507MPa, elongation 44%, the contraction percentage of area 84%.
Test case
Drawing and welding (GB/T25776 welding material are carried out with gren rod to the ER70S-6 welding wire of Examples 1 to 3 preparation
Expect welding technological properties assessment method) it tests, the performance test results are as shown in table 1:
1 the performance test results of table
As shown in Table 1, welding wire provided by the invention greatly reduces drawing difficulty and spatter loss coefficient with gren rod, improves
The aesthetics of weld seam.As shown in embodiment test result, the tensile strength of welding wire gren rod provided by the invention≤
526MPa, wire rod tensile strength difference≤40MPa of different heats, poker difference≤35MPa, elongation after fracture 39~44%, section
Shrinking percentage 78~84%, fracture of wire, welding wire spatter rate≤4%, weld seam be not smooth substantially for the drawing of wire rod.It follows that this
The welding wire that invention provides is optimized with gren rod properties, greatly reduces wire rod drawing difficulty and spatter
Rate improves weld seam aesthetics.
It can be seen that the present invention provides a kind of new selection for welding wire steel wire rod technical field, for welding wire steel wire rod system
A new direction and new approaches have been guided in the improvement for making technique.The result shows that the items of welding wire wire rod provided by the invention
It can be optimized, greatly reduce drawing difficulty and spatter loss coefficient, improve wire rod quality.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of welding wire gren rod, which is characterized in that the component including following mass percentage: C 0.060~
0.080%, Si 0.80~0.85%, Mn 1.50~1.55%, P≤0.015%, S 0.007~0.014%, T [O]
0.0015~0.0040%, N≤0.0030%, Ca≤0.0006%, surplus are Fe and impurity.
2. welding wire gren rod according to claim 1, which is characterized in that free oxygen in the welding wire gren rod
Content is 0.0010~0.0016wt%.
3. the preparation method of welding wire gren rod of any of claims 1 or 2, which comprises the following steps:
(1) molten iron and steel scrap are subjected to melting, silicomangan, low calcium ferrosilicon and low nitrogen carburant is added in tapping process, obtains
To thick steel-making liquid；
(2) lime, blistering deoxidier, ferrosilicon powder are added in the thick steel-making liquid for obtaining the step (1) and carries out LF refining, obtains
Refining liquid steel；
(3) under coverture effect, refining liquid steel in the step (2) is cast, slab is obtained；
(4) slab in the step (3) is rolled, obtains welding wire gren rod.
4. preparation method according to claim 3, which is characterized in that the operating parameter of melting includes: in the step (1)
Tapping temperature is 1570~1610 DEG C, and the tapping time is 4~7min；Speed >=0.32%/min of decarburization；
In terms of mass percentage, control tapping molten steel in C 0.04~0.06%, P≤0.010%, S 0.015~
0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo≤0.10%, V≤0.01%, surplus are Fe and impurity；
In terms of mass percentage, C 0.060~0.070%, Si 0.80~0.83%, Mn in the thick steel-making liquid are controlled
1.50~1.53%, P≤0.012%, S 0.015~0.025%, Cr≤0.10%, Ni≤0.10%, Cu≤0.10%, Mo
≤ 0.10%, V≤0.01%, surplus are Fe and impurity.
5. preparation method according to claim 3 or 4, which is characterized in that in the step (1), the matter of molten iron and steel scrap
Amount is than being (80~95): (13~28)；
The silicomangan includes the component of following mass percentage: Mn 63~70%, Si 22.0~25.0%, C≤
0.7%, P≤0.15%, S≤0.04%, surplus are Fe and impurity；
The low calcium ferrosilicon includes the component of following mass percentage: Si 74~80%, Al≤0.03%, Ca≤0.03%,
Mn≤0.10%, Cr≤0.10%, P≤0.020%, S≤0.04%, C≤0.020%, Ti≤0.015%, surplus be Fe and
Impurity.
6. preparation method according to claim 3, which is characterized in that the lime includes the group of following mass percentage
Point: CaO >=85%, MgO≤5%, SiO2≤ 3.5%, S≤0.100%, surplus are impurity；The igloss amount of the lime≤
7%, activity degree >=250mL；
Lime, ferrosilicon powder, Silicon carbide addition account for the quality hundred that quality of molten steel is slightly refined in the step (1) in the step (2)
Divide than being respectively 0.65~0.85%, 0.05~0.0.07%, 0.04~0.06%.Controlling the entire refining process of refining slag is ash
White slag state, it is ensured that control refining finishing slag R1.2~1.6, MnO+FeO < 1%.
7. the preparation method according to claim 3 or 6, which is characterized in that the total duration refined in the step (2) is 42
~46min, wherein the time of soft blow is 14~16min after refining；
In terms of mass percentage, C 0.060~0.080% in the refining liquid steel, Si 0.80~0.85%, Mn are controlled
1.50~1.55%, P≤0.015%, S 0.007~0.014%, [O] 0.0010~0.0016%, N≤0.0027%, Ca≤
0.0006%, surplus is Fe and impurity.
8. preparation method according to claim 3, which is characterized in that coverture includes following quality in the step (3)
The component of percentage composition: CaO 30~45%, SiO225~35%, Al2O38~15%, MgO 2~5%, remaining is that can not keep away
The impurity exempted from；The dosage of the coverture is not exposed for standard with middle packet liquid level.
9. the preparation method according to claim 3 or 8, which is characterized in that the operating parameter packet cast in the step (3)
Include: the degree of superheat of tundish molten steel is 15~25 DEG C, and the temperature of tundish molten steel is 1530~1540 DEG C；Crystallizer liquid slag layer
With a thickness of 10~15mm, the aligning target temperature of slab is 930~990 DEG C.
10. preparation method according to claim 3, which is characterized in that the operating parameter packet rolled in the step (4)
Include: the start rolling temperature of slab is 980~1030 DEG C, the head and tail temperature of slab is poor≤and 40 DEG C, final rolling temperature is 850~880 DEG C, is spat
Silk temperature is 820~840 DEG C；
Air-cooled roller-way is 16 sections, and first section base speed is 0.18m/s；
The length that the length of the air-cooled roller-way is respectively as follows: paragraph 1 roller-way is 5.5 meters；In 2nd~16 section of roller-way, every section of roller-way
Length be 7.5 meters；
The advanced rate that the advanced rate of the air-cooled roller-way is respectively as follows: the 1st~10 section of roller-way is 5%, the 11st~14 section of roller-way it is super
Antecedent is 10%, and the advanced rate of roller-way is 15% after the 14th section.
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| CN114058819A (en) * | 2021-11-23 | 2022-02-18 | 建龙北满特殊钢有限责任公司 | ER70S-6 hot-rolled wire rod and preparation method thereof |
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