CN105925760A - Wollastonite-magnesium grain cored wire, application as well as production technology of steel for high heat input welding - Google Patents

Wollastonite-magnesium grain cored wire, application as well as production technology of steel for high heat input welding Download PDF

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CN105925760A
CN105925760A CN201610533940.6A CN201610533940A CN105925760A CN 105925760 A CN105925760 A CN 105925760A CN 201610533940 A CN201610533940 A CN 201610533940A CN 105925760 A CN105925760 A CN 105925760A
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steel
magnesium
wollastonite
spun yarn
core
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刘增勋
孙立根
韩毅华
朱立光
王硕明
张彩军
王雁
周景
周景一
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North China University of Science and Technology
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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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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 invention discloses a wollastonite-magnesium grain cored wire, application as well as a production technology of steel for high heat input welding. The cored wire comprises an outer layer and a core, wherein the outer layer is a low-carbon steel, and the thickness is 0.5-1.0mm; the core is sustained release deactivation magnesium grains, and comprises a slow release agent and deactivation magnesium grains, wherein the slow release formulation is wollastonite, and is 5-90% of the content of the core; the deactivation magnesium grains are 10-95% of the content of the core. The cored wire is used in the steel for production of the high heat input welding. According to the wollastonite-magnesium grain cored wire disclosed by the invention, a sustained release deactivation magnesium grain cored wire using wollastonite as the slow release agent is fed to liquid steel, and the absorption rate of Mg is stable; the effect and the utilization rate of the Mg are high; inclusions are dispersed and rich, and inclusions containing the Mg achieve 80% or above. The wollastonite-magnesium grain cored wire disclosed by the invention has the characteristics of being simple in control, and low in production cost, and the steel for the high heat input welding can be industrially produced in a large-scale manner.

Description

Wollastonite-magnesium grain core-spun yarn and application and high input energy welding steel production technology
Technical field
The invention belongs to low-alloy steel manufacturing technology field, be specifically related to wollastonite-magnesium grain core-spun yarn and application and high input energy welding steel production technology.
Background technology
In the capital constructions such as steel plate is widely used in such as building, bridge, pressure vessel, storage tank, pipeline and boats and ships and heavy construction.Maximizing and the thickness increase of high stratification development trend requirement steel plate of building element, has higher combination property, including higher mechanical property, efficient processing characteristics and excellent corrosion resistance and resisting fatigue destructive characteristics etc. simultaneously.
But, along with the raising of armor plate strength, its impact toughness and welding performance are remarkably decreased, and welding crack sensibility increases.In order to improve the welding efficiency of engineering structure, in succession using Large Heat Input Welding technology in industry, the problem brought therewith is exactly that the intensity of welding heat affected zone, toughness decline to a great extent with the raising of weld heat input.There is serious grain coarsening, local softening and embrittlement in welding heat affected zone (HAZ), and general performance is that the toughness of heat affected area is greatly lowered, and threatens the safety in utilization of engineering structure.It is therefore prevented that the deterioration of welding process heat affected area performance is the key of exploitation high input energy welding steel.
Research shows, during welding, grain coarsening is the main cause that steel plate toughness is low, and the most effectual way of solution is fining austenite grains.Oxides Metallurgy Technology utilizes the fine oxide in steel, by promoting that Intragranular Acicular Ferrite forming core is obviously improved the tissue of welding heat affected zone, becomes the most effective technological approaches solving high input energy welding steel technical barrier.The microalloy treatment of steel simultaneously, generates tiny, disperse, refractory oxide and carbon, nitride particle, separates out at grain boundary precipitate, inhibiting grain growth, welding heat affected zone crystal grain can be refined, improve the strength and toughness of steel, thus increase substantially Large Heat Input Welding performance.In recent years, the forward position of the studies above is to use Mg as one of micro alloying element of steel.
Magnesium metal is the most active element, and its boiling point is 1107 DEG C, and higher due to molten steel temperature in steelmaking process, its vapour pressure is up to 2.0 × 106Pa, therefore magnesium adds in molten steel and evaporation loss and oxidational losses easily occurs, and adds and improper strong oxidation reaction can occur, produces strong splashing, be easily generated safety problem, also be difficult to accomplish the accurate control of Mg in steel simultaneously in molten steel.European patent EP 1052303A2 " has superior low-temperature tenacity, low-alloy high-strength steel " and describes and uses method compound for Ti-Mg can obtain tiny oxide particle in test steel during Large Heat Input Welding, but this test method is only applicable to laboratory vacuum smelting furnace smelts.Chinese patent CN 103938065 A " a kind of compound method adding magnesium titanium in high input energy welding steel " uses the Mg concentration in tundish feeds the method raising molten steel of Mg-Y-Ni B alloy wire, other element is inevitably brought into, it is difficult to realize the independent regulation of Mg content while adding Mg.Chinese patent CN 101724774 A " method that magnesium can be added in process of manufacturing large heat input welding steel plates ", Chinese patent CN 102191356 A " inclusion control method of Large Heat Input Welding steel plate " describes and obtains Mg recovery rate stable in steel by the method at cast base uniform place mat Ni-Mg alloy, but the method is suitable for small dimension vacuum smelting furnace smelts, converter-continuous casting industrialized great production cannot be realized, and while adding Mg, the most inevitably bring other element into, it is difficult to realize Mg content, add the regulation on Mg opportunity.Chinese patent CN 203048979 U " a kind of solid metal Mg alloy cored wine for steel desulfurization ", although its method is used for steel desulfurization, rather than the microalloying of high input energy welding steel, the core of its solid magnesium metal alloy claded wire is magnesium alloy, other metallic elements can be brought equally into, it is impossible to the independent control of Mg is fully achieved during feeding molten steel.And it is containing Mg93.6%, when molten steel feeds this core-spun yarn, it is impossible to realize fire-retardant.At the end of this core-spun yarn feeding molten steel, core-spun yarn is fused by molten steel, and the cored end of red heat may proceed to strongly aoxidize, and is burnt by whole dish core-spun yarn always, and is not used to actual production.Realize the requirement of high input energy welding steel performance, need to control the field trash structure of steel, make that it is tiny, disperse, abundant, thus the forming core of maximized induced austenite Intragranular Acicular Ferrite, suppression Austenite Grain Growth, fully refinement heat affected area tissue, increase substantially the low-temperature impact toughness of steel, this is premised on the microalloying of steel is precisely controlled, Mg is most important of which one microalloy element, a kind of method adding Mg to molten steel reliably is provided, could realize Mg independent, constantly, be precisely controlled, above-mentioned target could be realized.
Summary of the invention
For solving above-mentioned technical problem, the present invention provides wollastonite-magnesium grain core-spun yarn and application and high input energy welding steel production technology.This core-spun yarn add do not produce after molten steel gas, not with molten steel generation kickback, steel quality is not had harmful effect；The method can be avoided bringing other metallic element into when LF refining procedure adds Mg to molten steel, can accurately control add Mg amount and add Mg opportunity, realizing being precisely controlled of the multielement microalloying orders such as Al, Ti, Mg, line feeding process molten steel boiling appropriateness, steel ladle edge is without residual steel residue.
It is an object of the invention to provide wollastonite-magnesium grain core-spun yarn, described core-spun yarn includes outer layer and cored；Described outer layer is mild steel, and thickness is 0.5～1.0mm；Described cored is slow release Inactivate granular magnesium, and cored includes that slow releasing agent and Inactivate granular magnesium, described slow releasing agent are wollastonite, and described slow releasing agent accounts for the 5～90% of cored content, and Inactivate granular magnesium accounts for the 10～95% of cored content.
Chemical composition and the mass percent scope of slow releasing agent wollastonite of the present invention are as follows: CaO:44～48%, SiO2: 47～51%, H2O≤0.5%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium of the present invention, mass ratio >=3% of granularity≤80 mesh.
Inactivate granular magnesium of the present invention contains magnesium 90～96%, and remaining is passivator and inevitable impurity.
Core-spun yarn of the present invention a diameter of 10～15mm, cored slow release Inactivate granular magnesium bulk density 1.1～1.5g/cm3。
Another object of the present invention is to provide wollastonite-magnesium grain core-spun yarn application in preparing high input energy welding steel.
The present invention also provides for the production technology of a kind of high input energy welding steel, and this production technology includes: treat above-mentioned wollastonite-magnesium grain core-spun yarn feeding to carry out magnesium microalloying in the molten steel of magnesium alloy chemical.
High input energy welding steel production technology of the present invention includes pneumatic steelmaking, LF refine and continuous casting working procedure；Described LF refining procedure carries out Ti microalloying, adjusts Al Ca process according to Al desired value simultaneously, then carries out Mg microalloying.
LF refining procedure of the present invention, refining time >=35min, after feeding Ti line, clean argon blowing time >=5min, avoids liquid steel level exposed when only blowing；Enter the station liquid steel temperature, the first stove 1580～1590 DEG C, even waters stove 1575～1585 DEG C；Aluminum steel feed quantity 1.5-2.5m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder and make white slag；Molten steel before Calcium treatment: S≤0.010%, Als=250～350ppm, T=1580～1590 DEG C；Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.5-2.5m/t steel；Molten steel Als=150～300ppm, Ca=25～40ppm after Calcium treatment, then feeding wollastonite slow releasing agent core-spun yarn, feeding wire speed 2.5-3.5m/s, feed quantity 1.5-2.5m/t steel, out-station temperature 1570～1580 DEG C.
Pneumatic steelmaking operation of the present invention, steel-making molten iron [P]≤0.090% used, [S]≤0.045%；Terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing；Described continuous casting working procedure, the two weak coolings of cold employing, straightening temperature >=900 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 15～35 DEG C；Opening after watering normally, casting speed control is between 0.90～1.10m/min.
The mentality of designing of the present invention:
It is pneumatic steelmaking, LF refine, continuous casting that high input energy welding steel of the present invention smelts flow process.Deoxidizer kind and microalloy element be: Mo, Mn, Si, Nb, Al, Ca, Ti, Mg.Converter tapping process adds Mo, Mn, Si, Nb, and uses Al final deoxidizing, LF refining procedure to carry out Ti microalloying, adjusts Al Ca process according to Al desired value simultaneously, then carries out Mg microalloying.
The present invention uses Al final deoxidizing, carries out Mo, Nb, Ti, Mg microalloying, forms disperse, abundant, tiny refractory oxide, promotes the generation of austenite intragranular acicular ferrite.On the other hand, Mo, Nb of certain content, while crystal grain thinning improves the obdurability of steel, the formation of suppression crystal boundary pro-eutectoid ferrite.Inclusion particle that this outer portion is tiny and carbon, nitride pinning austenite grain boundary, several respects jointly act on and have fully refined heat affected area crystal grain, hence it is evident that improve the obdurability of steel.
The present invention feeds the slow release passivation Mg grain core-spun yarn with wollastonite as slow releasing agent at LF refining procedure to ladle, wollastonite slow release passivation Mg grain core-spun yarn can be according to ladle tonnage containing Mg amount and feeding speed, above ladle, free space size is regulated by core-spun yarn diameter and slow releasing agent ratio, make magnesium feeding molten steel during evaporation, aoxidize controlled, it is to avoid molten steel produces during feeding overgenerous splashing and causes production safety problem.Core-spun yarn reduces gasification rate and the molten steel boiling intensity of magnesium metal due to the addition of wollastonite slow releasing agent, therefore feeding speed and the insertion depth of wollastonite slow release passivation Mg grain core-spun yarn can be increased, improve the time that magnesium metal absorbs in molten steel, significantly, stably improve the absorbance of magnesium metal.
The present invention feeds the slow release Inactivate granular magnesium core-spun yarn with wollastonite as slow releasing agent to molten steel, and the absorbance of Mg is stable, and the effect of Mg and utilization rate are high, and field trash disperses, enriches, and the field trash containing Mg reaches more than 80%.With Al2O3Ti is contained for core2O3, matrix around MgO duplex impurity mutually in, form lean C, the microcell of lean Mn, improve ferritic phase temperature, increase ferrite nuclear driving force, promote ferrite crystal grain forming core.Partial oxide and carbon, nitride particle simultaneously, separating out at grain boundary precipitate, inhibiting grain growth and austenite grain boundary pro-eutectoid ferrite are formed, thus have fully refined HAZ tissue, HAZ low-temperature flexibility is greatly improved, reaches the requirement of industrialized production high input energy welding steel plate.
The present invention is at the end of ladle molten steel feeding wollastonite slow release passivation Mg grain core-spun yarn, and owing to the slow releasing agent formed by wollastonite between passivated magnesium granule in cored intercepts dilution, the core-spun yarn of fusing will not continue to burning, thus realizes the most fire-retardant.
The present invention is to the method for ladle molten steel feeding wollastonite slow release passivation Mg grain core-spun yarn, it is adaptable to actual production, and after ladle feeding wollastonite slow release passivation Mg grain core-spun yarn terminates, steel ladle edge is without residual steel residue.
Use what technique scheme produced to have the beneficial effects that: 1, wollastonite slow releasing agent add do not produce after molten steel gas, not with molten steel generation kickback, steel quality is not had undesirable effect, at a temperature of steel-making, rapidly, price is low in fusing, and the ratio of granularity≤80 mesh is not less than 3%.2, the present invention make magnesium feeding molten steel during evaporation, aoxidize controlled, it is to avoid molten steel produces during feeding overgenerous splashing and causes production safety problem.3, core-spun yarn reduces the gasification rate of magnesium metal and molten steel boiling intensity due to the addition of wollastonite slow releasing agent, add feeding speed and the insertion depth of core-spun yarn, improve the time that magnesium metal absorbs in molten steel, significantly, stably improve the absorbance of magnesium metal.4, production method of the present invention has fully refined HAZ tissue, and HAZ low-temperature flexibility is greatly improved, and reaches the requirement of industrialized production high input energy welding steel plate.The present invention controls simply, and production cost is low, can industrialized great production high input energy welding steel.
Accompanying drawing explanation
Fig. 1 is 200 times, high input energy welding steel heat affected area organization charts in embodiment 1；
Fig. 2 is 200 times, high input energy welding steel heat affected area organization charts in embodiment 2；
Fig. 3 is 200 times, high input energy welding steel heat affected area organization charts in embodiment 3；
Fig. 4 is 200 times, high input energy welding steel heat affected area organization charts in embodiment 4；
Fig. 5 is 200 times, high input energy welding steel heat affected area organization charts in embodiment 5.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1
A kind of wollastonite-magnesium grain core-spun yarn, a diameter of 13mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, and thickness is 1.0mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is wollastonite, and slow releasing agent accounts for the 75% of cored content, and Inactivate granular magnesium accounts for the 25% of cored content.Inactivate granular magnesium contains magnesium 92%, and remaining is passivator and inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent wollastonite are as follows: CaO:47.5%, SiO2: 51.5%, H2O:0.5%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium, the ratio of granularity≤80 mesh is 4%.
Cored slow release Inactivate granular magnesium bulk density 1.3g/cm3。
The production method of the high input energy welding steel of application wollastonite-magnesium grain core-spun yarn, specific as follows:
Smelting high input energy welding steel process is 120t top and bottom combined blown converter-120tLF ladle furnace refining-continuous casting.
Molten iron condition: molten iron [P]≤0.090%, [S]≤0.045%.
Converter: terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1685 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing.
LF: refining time 40min, after feeding Ti line, clean argon blowing time 8min, avoids liquid steel level exposed when only blowing.Enter the station liquid steel temperature, the first 1585 DEG C of stove, even waters 1580 DEG C of stove.Aluminum steel feed quantity 2m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder according to slag condition and make white slag.Molten steel before Calcium treatment: S≤0.010%, Als=280ppm, T=1585 DEG C.Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.85m/t steel, molten steel Als=260ppm, Ca=32ppm after Calcium treatment.Wollastonite slow release passivation Mg grain core-spun yarn, feeding wire speed 3m/s, feed quantity 1.92m/t steel, out-station temperature 1575 DEG C is fed after Calcium treatment.
Continuous casting: the two weak coolings of cold employing, straightening temperature 920 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 20 DEG C.Opening after watering normally, casting speed control is at 1.0m/min.
The chemical composition of gained big line energy welding steel is shown in Table 1, and impact property is shown in Table 2.
Embodiment 2
A kind of wollastonite-magnesium grain core-spun yarn, a diameter of 12mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, and thickness is 0.5～1.0mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is wollastonite, and slow releasing agent accounts for the 75% of cored content, and Inactivate granular magnesium accounts for the 25% of cored content.Inactivate granular magnesium contains magnesium 93%, and remaining is passivator and inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent wollastonite are as follows: CaO:47%, SiO2: 51%, H2O:0.5%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium, the ratio of granularity≤80 mesh is 6%.
Cored slow release Inactivate granular magnesium bulk density 1.2g/cm3。
The production method of the high input energy welding steel of application wollastonite-magnesium grain core-spun yarn, specific as follows:
Smelting high input energy welding steel process is 120t top and bottom combined blown converter-120tLF ladle furnace refining-continuous casting.
Molten iron condition: molten iron [P]≤0.090%, [S]≤0.045%.
Converter: terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing.
LF: refining time 45min, after feeding Ti line, clean argon blowing time 10min, avoids liquid steel level exposed when only blowing.Enter the station liquid steel temperature, the first 1580 DEG C of stove, even waters 1575 DEG C of stove.Aluminum steel feed quantity 1.5m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder according to slag condition and make white slag.Molten steel before Calcium treatment: S≤0.010%, Als=250ppm, T=1580 DEG C.Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.9m/t steel, molten steel Als=180ppm, Ca=34ppm after Calcium treatment.Wollastonite slow release passivation Mg grain core-spun yarn, feeding wire speed 3.1m/s, feed quantity 1.90m/t steel, out-station temperature 1572 DEG C is fed after Calcium treatment.
Continuous casting: the two weak coolings of cold employing, straightening temperature 905 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 22 DEG C.Opening after watering normally, casting speed control is at 1.0m/min.
The chemical composition of gained big line energy welding steel is shown in Table 1, and impact property is shown in Table 2.
Embodiment 3
A kind of wollastonite-magnesium grain core-spun yarn, a diameter of 11mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, and thickness is 0.5～1.0mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is wollastonite, and slow releasing agent accounts for the 75% of cored content, and Inactivate granular magnesium accounts for the 25% of cored content.
Chemical composition and the mass percent scope of slow releasing agent wollastonite are as follows: CaO:46%, SiO2: 51%, H2O:0.5%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium, the ratio of granularity≤80 mesh is 4%.
Cored slow release Inactivate granular magnesium bulk density 1.3g/cm3。
The production method of the high input energy welding steel of application wollastonite-magnesium grain core-spun yarn, specific as follows:
Smelting high input energy welding steel process is 120t top and bottom combined blown converter-120tLF ladle furnace refining-continuous casting.
Molten iron condition: molten iron [P]≤0.090%, [S]≤0.045%.
Converter: terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing.
LF: refining time 42min, after feeding Ti line, clean argon blowing time 6min, avoids liquid steel level exposed when only blowing.Enter the station liquid steel temperature, the first 1590 DEG C of stove, even waters 1585 DEG C of stove.Aluminum steel feed quantity 1.9m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder according to slag condition and make white slag.Molten steel before Calcium treatment: S≤0.010%, Als=320ppm, T=1590 DEG C.Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.75m/t steel, molten steel Als=280ppm, Ca=30ppm after Calcium treatment.Wollastonite slow release passivation Mg grain core-spun yarn, feeding wire speed 3.2m/s, feed quantity 1.88m/t steel, out-station temperature 1575 DEG C is fed after Calcium treatment.
Continuous casting: the two weak coolings of cold employing, straightening temperature 910 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 25 DEG C.Opening after watering normally, casting speed control is at 1.0m/min.
The chemical composition of gained big line energy welding steel is shown in Table 1, and impact property is shown in Table 2.
Embodiment 4
A kind of wollastonite-magnesium grain core-spun yarn, a diameter of 10mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel HPHC, and thickness is 0.5～1.0mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is wollastonite, and slow releasing agent accounts for the 75% of cored content, and Inactivate granular magnesium accounts for the 25% of cored content.Inactivate granular magnesium contains magnesium 96%, and remaining is passivator and inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent wollastonite are as follows: CaO:44%, SiO2: 52%, H2O:0.3%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium, the ratio of granularity≤80 mesh is 5%.
Cored slow release Inactivate granular magnesium bulk density 1.1g/cm3。
The production method of the high input energy welding steel of application wollastonite-magnesium grain core-spun yarn, specific as follows:
Smelting high input energy welding steel process is 80t top and bottom combined blown converter-80tLF ladle furnace refining-continuous casting.
Molten iron condition: molten iron [P]≤0.090%, [S]≤0.045%.
Converter: terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing.
LF: refining time 38min, after feeding Ti line, clean argon blowing time 5min, avoids liquid steel level exposed when only blowing.Enter the station liquid steel temperature, the first 1586 DEG C of stove, even waters 1578 DEG C of stove.Aluminum steel feed quantity 2.0m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder according to slag condition and make white slag.Molten steel before Calcium treatment: S≤0.010%, Als=350ppm, T=1586 DEG C.Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 2.5m/t steel, molten steel Als=300ppm, Ca=25ppm after Calcium treatment.Wollastonite slow release passivation Mg grain core-spun yarn, feeding wire speed 2.5m/s, feed quantity 2.5m/t steel, out-station temperature 1570 DEG C is fed after Calcium treatment.
Continuous casting: the two weak coolings of cold employing, straightening temperature 900 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 15 DEG C.Opening after watering normally, casting speed control is at 0.90m/min.
The chemical composition of gained big line energy welding steel is shown in Table 1, and impact property is shown in Table 2.
Embodiment 5
A kind of wollastonite-magnesium grain core-spun yarn, a diameter of 15mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel Q195, and thickness is 0.5～1.0mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is wollastonite, and slow releasing agent accounts for the 75% of cored content, and Inactivate granular magnesium accounts for the 25% of cored content.Inactivate granular magnesium contains magnesium 90%, and remaining is passivator and inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent wollastonite are as follows: CaO:48%, SiO2: 47%, H2O:0.5%, surplus is other inevitable impurity.
The granularity 0.5～3mm of Inactivate granular magnesium, the ratio of granularity≤80 mesh is 3%.
Cored slow release Inactivate granular magnesium bulk density 1.5g/cm3。
The production method of the high input energy welding steel of application wollastonite-magnesium grain core-spun yarn, specific as follows:
Smelting high input energy welding steel process is 160t top and bottom combined blown converter-160tLF ladle furnace refining-continuous casting.
Molten iron condition: molten iron [P]≤0.090%, [S]≤0.045%.
Converter: terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing.
LF: refining time 35min, after feeding Ti line, clean argon blowing time 7min, avoids liquid steel level exposed when only blowing.Enter the station liquid steel temperature, the first 1590 DEG C of stove, even waters 1580 DEG C of stove.Aluminum steel feed quantity 2.5m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder according to slag condition and make white slag.Molten steel before Calcium treatment: S≤0.010%, Als=250ppm, T=1590 DEG C.Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.5m/t steel, molten steel Als=150ppm, Ca=40ppm after Calcium treatment.Wollastonite slow release passivation Mg grain core-spun yarn, feeding wire speed 3.5m/s, feed quantity 1.92m/t steel, out-station temperature 1580 DEG C is fed after Calcium treatment.
Continuous casting: the two weak coolings of cold employing, straightening temperature 910 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 35 DEG C.Opening after watering normally, casting speed control is at 1.10m/min.
The chemical composition of gained big line energy welding steel is shown in Table 1, and impact property is shown in Table 2.
Chemical composition (mass%) in table 1 embodiment 1-5
C Mn S P Si Als Mo Ti Mg Nb
Embodiment 1 0.07 1.54 0.005 0.019 0.25 0.026 0.07 0.016 0.0028 0.030
Embodiment 2 0.07 1.48 0.005 0.018 0.22 0.018 0.07 0.015 0.0031 0.030
Embodiment 3 0.07 1.49 0.005 0.022 0.24 0.023 0.07 0.013 0.0025 0.023
Embodiment 4 0.07 1.51 0.006 0.026 0.23 0.029 0.07 0.015 0.0028 0.031
Embodiment 5 0.07 1.54 0.005 0.021 0.25 0.015 0.07 0.019 0.0024 0.030
Note: surplus is ferrum and inevitable impurity
The impact property (heat input 150KJ/cm) of table 2 embodiment
Gap position Breach type Test temperature/DEG C Impact absorbing energy/J
Embodiment 1 Melt run+2mm VHT2 V-type -20 192.7
Embodiment 2 Melt run+2mm VHT2 V-type -20 190.8
Embodiment 3 Melt run+2mm VHT2 V-type -20 196.5
Embodiment 4 Melt run+2mm VHT2 V-type -20 198.6
Embodiment 5 Melt run+2mm VHT2 V-type -20 195.5
Table 2 lists 40mm steel plate weld heat input when being 150KJ/cm, the welding heat affected zone low-temperature impact toughness value of embodiment 1-5.The steel plate that the present invention produces has rational heat affected area organizational structure, it is by forming abundant intracrystalline needle-like, sheet columnar ferrite and granular bainite, and the effective inclusion particle pinning to austenite grain boundary, significantly refine heat affected area tissue, made the obdurability of steel significantly improve.
Can be seen that the high input energy welding steel produced smelted by application wollastonite-magnesium grain core-spun yarn from accompanying drawing 1-5, improve the absorbance of Mg, make that the composite oxides that Mg formed are abundant, being distributed in steel of disperse, so that in the tissue of 200 times, heat affected area, crystal grain is tiny in Large Heat Input Welding steel, the obdurability making Large Heat Input Welding steel improves, thus improve the heat affected area ballistic work absorption value of Large Heat Input Welding steel, control simple, production cost is low, can industrialized great production high input energy welding steel.
Above example is only in order to illustrative not limiting technical scheme, although the present invention being described in detail with reference to above-described embodiment, it will be understood by those within the art that: still the present invention can be modified or equivalent, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should be contained in the middle of scope of the presently claimed invention.

Claims (10)

1. wollastonite-magnesium grain core-spun yarn, it is characterised in that described core-spun yarn includes outer layer and cored；Described outer layer is mild steel, and thickness is 0.5～1.0mm；Described cored is slow release Inactivate granular magnesium, and cored includes that slow releasing agent and Inactivate granular magnesium, described slow releasing agent are wollastonite, and described slow releasing agent accounts for the 5～90% of cored content, and Inactivate granular magnesium accounts for the 10～95% of cored content.
Wollastonite the most according to claim 1-magnesium grain core-spun yarn, it is characterised in that chemical composition and the mass percent scope of described slow releasing agent wollastonite are as follows: CaO:44～48%, SiO2: 47～51%, H2O≤0.5%, surplus is other inevitable impurity.
Wollastonite the most according to claim 1 and 2-magnesium grain core-spun yarn, it is characterised in that the granularity 0.5～3mm of described Inactivate granular magnesium, mass ratio >=3% of granularity≤80 mesh.
Wollastonite the most according to claim 1 and 2-magnesium grain core-spun yarn, it is characterised in that described Inactivate granular magnesium contains magnesium 90～96%, and remaining is passivator and inevitable impurity.
Wollastonite the most according to claim 1 and 2-magnesium grain core-spun yarn, it is characterised in that described core-spun yarn a diameter of 10～15mm, cored slow release Inactivate granular magnesium bulk density 1.1～1.5g/cm3。
6. based on the wollastonite described in claim 1-5 any one-magnesium grain core-spun yarn application in preparing high input energy welding steel.
7. the production technology of a high input energy welding steel, it is characterised in that this production technology includes: treat the wollastonite described in any one in claim 1-5-magnesium grain core-spun yarn feeding to carry out magnesium microalloying in the molten steel of magnesium alloy chemical.
The production technology of a kind of high input energy welding steel the most according to claim 7, it is characterised in that described high input energy welding steel production technology includes pneumatic steelmaking, LF refine and continuous casting working procedure；Described LF refining procedure carries out Ti microalloying, adjusts Al Ca process according to Al desired value simultaneously, then carries out Mg microalloying.
9., according to the production technology of a kind of high input energy welding steel described in claim 7 or 8, it is characterised in that described LF refining procedure, refining time >=35min, after feeding Ti line, clean argon blowing time >=5min, avoids liquid steel level exposed when only blowing；Enter the station liquid steel temperature, the first stove 1580～1590 DEG C, even waters stove 1575～1585 DEG C；Aluminum steel feed quantity 1.5-2.5m/t steel after entering the station, adds Calx, fluorite, drops electric polarization slag, adds aluminium powder and make white slag；Molten steel before Calcium treatment: S≤0.010%, Als=250～350ppm, T=1580～1590 DEG C；Calcium treatment uses Ca-Si line, Ca-Si line feed quantity 1.5-2.5m/t steel；Molten steel Als=150～300ppm, Ca=25～40ppm after Calcium treatment, then feeding wollastonite slow releasing agent core-spun yarn, feeding wire speed 2.5-3.5m/s, feed quantity 1.5-2.5m/t steel, out-station temperature 1570～1580 DEG C.
10. according to the production technology of a kind of high input energy welding steel described in claim 7 or 8, it is characterised in that described pneumatic steelmaking operation, steel-making molten iron [P]≤0.090% used, [S]≤0.045%；Terminal target [C]=0.04～0.06%, [P]≤0.015%, [S]≤0.030%, [O]=500～800ppm, tapping temperature 1660～1690 DEG C, in tapping process, addition molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use Al final deoxidizing；Described continuous casting working procedure, the two weak coolings of cold employing, straightening temperature >=900 DEG C, tundish uses carbon-free covering agent, the suitable degree of superheat of tundish 15～35 DEG C；Opening after watering normally, casting speed control is between 0.90～1.10m/min.
CN201610533940.6A 2016-07-08 2016-07-08 Wollastonite-magnesium grain cored wire, application as well as production technology of steel for high heat input welding Pending CN105925760A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1276435A (en) * 1999-06-08 2000-12-13 湘潭钢铁集团有限公司 Clad Mg-based wire and its application in external desulfurization of molten iron
CN1354057A (en) * 2001-10-17 2002-06-19 孙本良 Passive magnesium powder and its preparation method
CN1865456A (en) * 2006-06-22 2006-11-22 武汉科技大学 Alloy cored wire for deeply desulfurization of steel bucket finery and its preparation method
CN102559997A (en) * 2012-01-10 2012-07-11 周海涛 Seamless solid metal calcium cored wire for steelmaking and deoxidation and preparation method thereof
CN102605247A (en) * 2012-03-09 2012-07-25 宝山钢铁股份有限公司 High-heat-input welding thick steel plate and manufacturing method thereof
CN102796846A (en) * 2012-09-03 2012-11-28 秦皇岛双轮环保科技有限公司 Composite cored wire for steelmaking and preparation method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1276435A (en) * 1999-06-08 2000-12-13 湘潭钢铁集团有限公司 Clad Mg-based wire and its application in external desulfurization of molten iron
CN1354057A (en) * 2001-10-17 2002-06-19 孙本良 Passive magnesium powder and its preparation method
CN1865456A (en) * 2006-06-22 2006-11-22 武汉科技大学 Alloy cored wire for deeply desulfurization of steel bucket finery and its preparation method
CN102559997A (en) * 2012-01-10 2012-07-11 周海涛 Seamless solid metal calcium cored wire for steelmaking and deoxidation and preparation method thereof
CN102605247A (en) * 2012-03-09 2012-07-25 宝山钢铁股份有限公司 High-heat-input welding thick steel plate and manufacturing method thereof
CN102796846A (en) * 2012-09-03 2012-11-28 秦皇岛双轮环保科技有限公司 Composite cored wire for steelmaking and preparation method thereof

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Application publication date: 20160907