CN106011375A - Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding - Google Patents

Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding Download PDF

Info

Publication number
CN106011375A
CN106011375A CN201610532181.1A CN201610532181A CN106011375A CN 106011375 A CN106011375 A CN 106011375A CN 201610532181 A CN201610532181 A CN 201610532181A CN 106011375 A CN106011375 A CN 106011375A
Authority
CN
China
Prior art keywords
steel
magnesium
clinker
core
spun yarn
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610532181.1A
Other languages
Chinese (zh)
Inventor
王硕明
张彩军
韩毅华
朱立光
刘增勋
孙立根
王雁
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
North China University of Science and Technology
Original Assignee
North China University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North China University of Science and Technology filed Critical North China University of Science and Technology
Priority to CN201610532181.1A priority Critical patent/CN106011375A/en
Publication of CN106011375A publication Critical patent/CN106011375A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a cement clinker magnesium granule cored wire, application and a production technology of steel for large heat input welding. The cored wire comprises an outer layer and a core. The outer layer is prepared from low-carbon steel with the thickness of 0.5-1.0 mm. The core is prepared from slow release passivation magnesium granules. The core comprises a slow release agent and the passivation magnesium granules, wherein the slow release agent is cement clinker, the slow release agent accounts for 5-90% of the content of the core, and the passivation magnesium granules account for 10-95% of the content of the core. The cored wire is applied in preparation of the steel for large heat input welding. The slow release passivation magnesium granule cored wire with the cement clinker as the slow release agent is fed into molten steel, the absorption rate of Mg is stable, the acting and utilization rate of Mg is high, inclusion is dispersed and rich, and the inclusion containing Mg reaches 80% or above. By the adoption of the cement clinker magnesium granule cored wire, the application and the production technology of the steel for large heat input welding, control is simple, the production cost is low, and industrial mass production of the steel for large heat input welding can be achieved.

Description

Clinker 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 clinker-magnesium grain core-spun yarn and application with big Heat input welding steel production technology.
Background technology
Capital constructions such as steel plate is widely used in such as building, bridge, pressure vessel, storage tank, pipeline and boats and ships and large-scale In building.Building element maximize and high stratification development trend require steel plate thickness increase, have simultaneously higher comprehensively Performance, including higher mechanical property, efficient processing characteristics and excellent corrosion resistance and resisting fatigue destructive characteristics etc..
But, along with the raising of armor plate strength, its impact toughness and welding performance are remarkably decreased, and welding crack sensibility increases Add.In order to improve the welding efficiency of engineering structure, in industry, in succession use Large Heat Input Welding technology, the problem brought therewith It is exactly that the intensity of welding heat affected zone, toughness decline to a great extent with the raising of weld heat input.Welding heat affected zone (HAZ) occurs Serious grain coarsening, local softening and embrittlement, general performance is that the toughness of heat affected area is greatly lowered, and threatens engineering knot The safety in utilization of structure.It is therefore prevented that the deterioration of welding process heat affected area performance is the pass of exploitation high input energy welding steel Key.
Research shows, during welding, grain coarsening is the main cause that steel plate toughness is low, and the most effectual way of solution is refinement Austenite crystal.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.Steel simultaneously Microalloy treatment, generates tiny, disperse, refractory oxide and carbon, nitride particle, separates out at grain boundary precipitate, suppression crystalline substance Grain length is big, can refine welding heat affected zone crystal grain, improve the strength and toughness of steel, thus increase substantially Large Heat Input Welding Energy.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, 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 improper meeting and sends out Raw strong oxidation reaction, produces strong splashing in molten steel, is easily generated safety problem, also be difficult to accomplish Mg in steel simultaneously Accurately control.European patent EP 1052303A2 " has superior low-temperature tenacity, low-alloy high-strength steel " and introduces during Large Heat Input Welding Use method compound for Ti-Mg can obtain tiny oxide particle in test steel, but this test method is the most applicable Smelt in laboratory vacuum smelting furnace.Chinese patent CN 103938065 A " compound interpolation in a kind of high input energy welding steel The method of magnesium titanium " use the Mg concentration in tundish feeds the method raising molten steel of Mg-Y-Ni B alloy wire, can not while adding Mg That avoids brings other element into, it is difficult to realize the independent regulation of Mg content.Chinese patent CN 101724774 A " can line energy greatly The method adding magnesium in amount welding steel plate manufacture process ", Chinese patent CN 102191356 A " Large Heat Input Welding thickness steel The inclusion control method of plate " in describe by obtaining in steel stable in the method for cast base uniform place mat Ni-Mg alloy Mg recovery rate, but the method be suitable for small dimension vacuum smelting furnace smelt, it is impossible to realize converter-big life of continuous casting industrialization Produce, and the most inevitably bring other element into while adding Mg, it is difficult to realize Mg content, add the regulation on Mg opportunity.China is specially Profit CN 203048979 U " a kind of solid metal Mg alloy cored wine for steel desulfurization ", although its method is used for making steel de- Sulfur, rather than the microalloying of high input energy welding steel, the core of its solid magnesium metal alloy claded wire is magnesium alloy, feeds Other metallic elements can be brought equally into, it is impossible to the independent control of Mg is fully achieved when entering molten steel.And it is containing Mg93.6%, to molten steel When feeding 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, the bag of red heat Core end may proceed to strongly aoxidize, and is burnt by whole dish core-spun yarn always, and is not used to actual production.Realize Large Heat Input Welding With the requirement of Steel Properties, need to control the field trash structure of steel so that it is tiny, disperse, abundant, thus maximized induction Ovshinsky The forming core of body Intragranular Acicular Ferrite, suppression Austenite Grain Growth, fully refinement heat affected area tissue, increases substantially the low temperature of steel Impact flexibility, this is premised on the microalloying of steel is precisely controlled, and Mg is most important of which one microalloy element, it is provided that A kind of method reliably adding Mg to molten steel, 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 clinker-magnesium grain core-spun yarn and application and Large Heat Input Welding Use steel production technology.This core-spun yarn add do not produce after molten steel gas, not with molten steel generation kickback, to steel quality the most not Good impact；The method can be avoided bringing other metallic element into when LF refining procedure adds Mg to molten steel, can accurately control to add Mg Measure and add Mg opportunity, it is achieved 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 clinker-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 slow releasing agent and passivated magnesium Grain, described slow releasing agent is clinker, and described slow releasing agent accounts for the 5～90% of cored content, Inactivate granular magnesium account for cored content 10～ 95%。
Chemical composition and the mass percent scope of slow releasing agent clinker of the present invention are as follows: CaO:62～67%, SiO2: 20～24%, Al2O3: 4～7%, Fe2O3: 2.5～6.5%, 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 0.8～1.3g/cm3。
Another object of the present invention is to provide a kind of above-mentioned clinker-magnesium grain core-spun yarn preparing large-line energy weldering Connect with the application in steel.
The present invention also provides for the production technology of a kind of high input energy welding steel, and this production technology includes: by above-mentioned water Mud grog-magnesium grain core-spun yarn feeds in the molten steel treating magnesium alloy chemical and carries out magnesium microalloying.
High input energy welding steel production technology of the present invention, including pneumatic steelmaking, LF refine and continuous casting working procedure；Institute State LF refining procedure and carry out Ti microalloying, according to Al desired value, Al is adjusted and Ca process simultaneously, then carry out Mg microalloy Change.
LF refining procedure of the present invention, refining time >=35min, clean argon blowing time >=5min after feeding Ti line, when only blowing Avoid liquid steel level exposed；Enter the station liquid steel temperature, the first stove 1580～1590 DEG C, even waters stove 1575～1585 DEG C；Aluminum after entering the station Line feed quantity 1.5-2.5 m/t steel, 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 1.5-2.5 M/t steel；Molten steel Als=150～300ppm, Ca=25～40ppm after Calcium treatment, then feeding clinker slow releasing agent core-spun yarn, Feeding wire speed 2.5-3.5m/s, feed quantity 1.5-2.5 m/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 micro-conjunction Gold element is: Mo, Mn, Si, Nb, Al, Ca, Ti, Mg.Converter tapping process adds Mo, Mn, Si, Nb, and uses Al final deoxidizing, LF Refining procedure carries 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 high-melting-point Oxide, promotes the generation of austenite intragranular acicular ferrite.On the other hand, Mo, Nb of certain content, improves at crystal grain thinning While the obdurability of steel, the formation of suppression crystal boundary pro-eutectoid ferrite.Inclusion particle that this outer portion is tiny and carbon, nitridation Thing 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 clinker as slow releasing agent, water at LF refining procedure to ladle Mud grog slow release passivation Mg grain core-spun yarn containing Mg amount and feeding speed can according to ladle tonnage, above ladle free space size by Core-spun yarn diameter and slow releasing agent ratio regulate, make magnesium feeding molten steel during evaporation, aoxidize controlled, it is to avoid steel during feeding Water produces overgenerous splashing and causes production safety problem.Core-spun yarn reduces gold due to the addition of clinker slow releasing agent Belong to gasification rate and the molten steel boiling intensity of magnesium, therefore can increase the feeding speed of clinker slow release passivation Mg grain core-spun yarn And insertion depth, 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 clinker as slow releasing agent to molten steel, and the absorbance of Mg is steady Fixed, 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 Al2O3Contain for core There is Ti2O3, matrix around MgO duplex impurity mutually in, form lean C, the microcell of lean Mn, improve ferritic phase temperature, increase ferrum Ferritic nuclear driving force, promotes ferrite crystal grain forming core.Partial oxide and carbon, nitride particle simultaneously, analyses at grain boundary precipitate Going out, inhibiting grain growth and austenite grain boundary pro-eutectoid ferrite are formed, thus have fully refined HAZ tissue, increase substantially HAZ low-temperature flexibility, reaches the requirement of industrialized production high input energy welding steel plate.
The present invention is at the end of ladle molten steel feeding clinker slow release passivation Mg grain core-spun yarn, due to passivated magnesium in cored Being intercepted dilution by the slow releasing agent of cement clinker formation between granule, the core-spun yarn of fusing will not continue to burning, thus realizes effectively Fire-retardant.
The present invention is to the method for ladle molten steel feeding clinker slow release passivation Mg grain core-spun yarn, it is adaptable to actual production, After ladle feeding clinker slow release passivation Mg grain core-spun yarn terminates, steel ladle edge is without residual steel residue.
Use having the beneficial effects that of technique scheme generation: 1, clinker slow releasing agent does not produce gas after adding molten steel Body, not with molten steel generation kickback, steel quality is not had undesirable effect, at a temperature of steel-making, rapidly, price is low, grain in fusing The ratio of degree≤80 mesh is not less than 3%.2, the present invention make magnesium feeding molten steel during evaporation, aoxidize controlled, it is to avoid during feeding Molten steel produces overgenerous splashing and causes production safety problem.3, core-spun yarn is due to the addition reduction of clinker slow releasing agent The gasification rate of magnesium metal and molten steel boiling intensity, add feeding speed and the insertion depth of core-spun yarn, improve metal The time that magnesium absorbs in molten steel, significantly, stably improve the absorbance of magnesium metal.4, production method of the present invention fully refines HAZ tissue, is greatly improved HAZ low-temperature flexibility, reaches the requirement of industrialized production high input energy welding steel plate.This Bright control is simple, 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 clinker-magnesium grain core-spun yarn, a diameter of 13mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, 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 that cement is ripe Material, 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 With inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent clinker are as follows: CaO:66%, SiO2: 23%, Al2O3: 6%, Fe2O3: 3%, H2O:0.5%.Surplus is 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 clinker-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 the most de-with Al Oxygen.
LF: refining time 40min, after feeding Ti line, clean argon blowing time 8min, avoids liquid steel level exposed when only blowing.Enter the station steel Coolant-temperature gage, the first 1585 DEG C of stove, even waters 1580 DEG C of stove.Aluminum steel feed quantity 2.0 m/t steel after entering the station, adds Calx, fluorite, drops electrode Change slag, add 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 is adopted Use Ca-Si line, Ca-Si line feed quantity 1.85 m/t steel, molten steel Als=260ppm, Ca=32ppm after Calcium treatment.Feed after Calcium treatment Enter clinker 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.
Continuous casting: the two weak coolings of cold employing, straightening temperature 920 DEG C, tundish uses carbon-free covering agent, and tundish is the most overheated Spend 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 clinker-magnesium grain core-spun yarn, a diameter of 12mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, 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 that cement is ripe Material, 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 With inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent clinker are as follows: CaO:65%, SiO2: 22%, Al2O3: 5%, Fe2O3: 6%, H2O:0.5%.Surplus is 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 clinker-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, add molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use in tapping process 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, fall electricity Polarization slag, adds aluminium powder according to slag condition and makes white slag.Molten steel before Calcium treatment: S≤0.010%, Als=250ppm, T=1580 DEG C.Calcium treatment Use Ca-Si line, Ca-Si line feed quantity 1.9m/t steel, molten steel Als=180ppm, Ca=34ppm after Calcium treatment.Feed after Calcium treatment Enter clinker 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.
Continuous casting: the two weak coolings of cold employing, straightening temperature 905 DEG C, tundish uses carbon-free covering agent, and tundish is the most overheated Spend 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 clinker-magnesium grain core-spun yarn, a diameter of 11mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel 08Al, 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 that cement is ripe Material, 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 clinker are as follows: CaO:64%, SiO2: 21%, Al2O3: 6%, Fe2O3: 5%, H2O:0.5%.Surplus is 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 clinker-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, add molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use in tapping process 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 steel Coolant-temperature gage, the first 1590 DEG C of stove, even waters 1585 DEG C of stove.Aluminum steel feed quantity 1.9 m/t steel after entering the station, adds Calx, fluorite, drops electrode Change slag, add 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 is adopted Use Ca-Si line, Ca-Si line feed quantity 1.75 m/t steel, molten steel Als=280ppm, Ca=30ppm after Calcium treatment.Feed after Calcium treatment Enter clinker slow release passivation Mg grain core-spun yarn, feeding wire speed 2.5m/s, feed quantity 2.2m/t steel, out-station temperature 1575 DEG C.
Continuous casting: the two weak coolings of cold employing, straightening temperature 910 DEG C, tundish uses carbon-free covering agent, and tundish is the most overheated Spend 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 clinker-magnesium grain core-spun yarn, a diameter of 10mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel HPHC, thickness is 0.5mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is that cement is ripe Material, 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 With inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent clinker are as follows: CaO:67%, SiO2: 20%, Al2O3: 4%, Fe2O3: 6.5%, H2O:0.3%.Surplus is 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 clinker-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, add molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use in tapping process 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 steel Coolant-temperature gage, the first 1586 DEG C of stove, even waters 1578 DEG C of stove.Aluminum steel feed quantity 2.0 m/t steel after entering the station, adds Calx, fluorite, drops electrode Change slag, add 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 is adopted Use Ca-Si line, Ca-Si line feed quantity 2.5m/t steel, molten steel Als=300ppm, Ca=25ppm after Calcium treatment.Feed after Calcium treatment Clinker slow release passivation Mg grain core-spun yarn, feeding wire speed 2.5m/s, feed quantity 2.4m/t steel, out-station temperature 1570 DEG C.
Continuous casting: the two weak coolings of cold employing, straightening temperature 900 DEG C, tundish uses carbon-free covering agent, and tundish is the most overheated Spend 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 clinker-magnesium grain core-spun yarn, a diameter of 15mm, core-spun yarn includes outer layer and cored；Described outer layer is mild steel Q195, thickness is 0.8mm；Cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, and slow releasing agent is that cement is ripe Material, 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 With inevitable impurity.
Chemical composition and the mass percent scope of slow releasing agent clinker are as follows: CaO:62%, SiO2: 24%, Al2O3: 7%, Fe2O3: 2.5%, H2O:0.5%.Surplus is 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 0.8g/cm3。
The production method of the high input energy welding steel of application clinker-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, add molybdenum-iron, ferromanganese, ferrosilicon, ferro-niobium, ferro-aluminum carry out microalloying, and use in tapping process 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 steel Coolant-temperature gage, 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 electrode Change slag, add 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 is adopted Use Ca-Si line, Ca-Si line feed quantity 1.5m/t steel, molten steel Als=150ppm, Ca=40ppm after Calcium treatment.Feed after Calcium treatment Clinker 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.
Continuous casting: the two weak coolings of cold employing, straightening temperature 910 DEG C, tundish uses carbon-free covering agent, and tundish is the most overheated Spend 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.
The chemical composition (mass%) of table 1 embodiment 1-5
C Mn S P Si Als Mo Ti Mg Nb
Embodiment 1 0.06 1.48 0.006 0.021 0.24 0.026 0.07 0.018 0.0026 0.031
Embodiment 2 0.07 1.49 0.005 0.016 0.26 0.018 0.07 0.019 0.0030 0.026
Embodiment 3 0.06 1.56 0.004 0.017 0.23 0.022 0.07 0.016 0.0025 0.028
Embodiment 4 0.07 1.52 0.006 0.022 0.25 0.029 0.07 0.017 0.0028 0.031
Embodiment 5 0.06 1.51 0.007 0.020 0.23 0.026 0.07 0.018 0.0026 0.025
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 -20 187.1
Embodiment 2 Melt run+2mm VHT2 V-type -20 194.3
Embodiment 3 Melt run+2mm VHT2 V-type -20 196.7
Embodiment 4 Melt run+2mm VHT2 V-type -20 195.0
Embodiment 5 Melt run+2mm VHT2 V-type -20 194.7
Table 2 lists 40mm steel plate weld heat input when being 150KJ/cm, and the welding heat affected zone low-temperature impact of embodiment 1-5 is tough Property value.The steel plate that the present invention produces has rational heat affected area organizational structure, and it is by forming intracrystalline needle-like, the lamellar enriched Ferrite and granular bainite, and the effective inclusion particle pinning to austenite grain boundary, refined heat affected area group significantly Knit, make the obdurability of steel significantly improve.
Can be seen that from accompanying drawing 1-5 and utilize this clinker-magnesium grain core-spun yarn to smelt the high input energy welding steel produced, Improve the absorbance of Mg, make being distributed in steel of the composite oxides disperse that Mg formed, so that in Large Heat Input Welding steel In the tissue of 200 times, heat affected area, crystal grain is tiny, makes the obdurability of Large Heat Input Welding steel improve, thus improves large-line energy weldering Connecing the heat affected area ballistic work absorption value of steel, control simple, production cost is low, can use by industrialized great production Large Heat Input Welding Steel.
Above example is only in order to illustrative not limiting technical scheme, although with reference to above-described embodiment to this Bright be described in detail, it will be understood by those within the art that: still the present invention can be modified or etc. With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should contain the power in the present invention In the middle of profit claimed range.

Claims (10)

1. clinker-magnesium grain core-spun yarn, it is characterised in that described core-spun yarn includes outer layer and cored；Described outer layer is low-carbon (LC) Steel, thickness is 0.5～1.0mm；Described cored is slow release Inactivate granular magnesium, and cored includes slow releasing agent and Inactivate granular magnesium, described slow release Agent is clinker, 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.
Clinker the most according to claim 1-magnesium grain core-spun yarn, it is characterised in that described slow releasing agent clinker Chemical composition and mass percent scope are as follows: CaO:62～67%, SiO2: 20～24%, Al2O3: 4～7%, Fe2O3: 2.5～ 6.5%, H2O≤0.5%, surplus is other inevitable impurity.
Clinker the most according to claim 1 and 2-magnesium grain core-spun yarn, it is characterised in that the granularity of described Inactivate granular magnesium 0.5～3mm, mass ratio >=3% of granularity≤80 mesh.
Clinker 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%, remaining is passivator and inevitable impurity.
Clinker 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 0.8～1.3g/cm3。
6. preparing high input energy welding steel based on the clinker described in claim 1-5 any one-magnesium grain core-spun yarn In application.
7. the production technology of a high input energy welding steel, it is characterised in that this production technology includes: by claim 1-5 Clinker described in middle any one-magnesium grain core-spun yarn feeds in the molten steel treating magnesium alloy chemical and carries out magnesium microalloying.
The production technology of a kind of high input energy welding steel the most according to claim 7, it is characterised in that described big line energy Amount welding steel production technology includes pneumatic steelmaking, LF refine and continuous casting working procedure；Described LF refining procedure carries out Ti microalloy Change, according to Al desired value, Al is adjusted and Ca process simultaneously, then carry 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 water stove 1575～1585 DEG C；Aluminum steel feed quantity 1.5-2.5m/t steel after entering the station, Add Calx, fluorite, drop electric polarization slag, add 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 after Calcium treatment ～300ppm, Ca=25～40ppm, then feeding clinker slow releasing agent core-spun yarn, feeding wire speed 2.5-3.5m/s, feed quantity 1.5-2.5 m/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 turn Stove steel making working procedure, 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, tapping process adds molybdenum-iron, manganese Ferrum, 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, aligning temperature Spending >=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 exists Between 0.90～1.10m/min.
CN201610532181.1A 2016-07-08 2016-07-08 Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding Pending CN106011375A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610532181.1A CN106011375A (en) 2016-07-08 2016-07-08 Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610532181.1A CN106011375A (en) 2016-07-08 2016-07-08 Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding

Publications (1)

Publication Number Publication Date
CN106011375A true CN106011375A (en) 2016-10-12

Family

ID=57108207

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610532181.1A Pending CN106011375A (en) 2016-07-08 2016-07-08 Cement clinker magnesium granule cored wire, application and production technology of steel for large heat input welding

Country Status (1)

Country Link
CN (1) CN106011375A (en)

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

Similar Documents

Publication Publication Date Title
CN100560273C (en) High-strength high-tenacity gas shielded welding wire
CN101684534B (en) Steel plate adapting to large-linear energy welding and manufacturing method thereof
CN102242309B (en) Production method of boron-containing petroleum storage tank steel plate for ultra-high heat input welding
CN107984112B (en) High-strength submerged arc welding wire with good low-temperature toughness
CN105397335B (en) Water cooling grate plate, material scraping plate flux-cored welding wire for overlaying welding
CN103966515B (en) A kind of method utilizing electric arc furnace to prepare low-alloy high-strength toughness cast steel adding
CN101722382A (en) High-strength welding wires of gas shielded welding needing thermal refining after welding
CN104923967B (en) The high-strength and high ductility gas shield welding wire and weld metal of preheating can be exempted
CN101439446A (en) High-strength steel high-ductility gas shielded welding wire
CN105714193B (en) A kind of oxide is enhanced can high heat-input welding steel
CN101462207A (en) High-ductility submerged arc welding wire for pipeline steel
CN109972035B (en) 800 MPa-level hot-rolled twisted steel and production method thereof
CN1321777C (en) Niobium-titanium-boron microalloy high-strength gas protecting welding wire
CN1127390C (en) High-toughness gas protective welding wire for low alloy high-strength steel
CN106868420A (en) One kind forging superhigh intensity low-alloy wear-resistant steel and preparation method thereof
CN112247399A (en) 700 MPa-level annealing-free drawing high-strength steel gas protection solid welding wire
CN107900555A (en) A kind of welding wire for 630MPa grades high Nb steel two pass submerged-arc welding
CN106392373A (en) High-strength gas shielded solid welding wire for 1000 MPa-level steel for engineering machinery
CN106191373A (en) Covering slag magnesium grain core-spun yarn and application and high input energy welding steel production technology
CN105925759A (en) Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel
CN1152767C (en) Microtitanium-boron high-toughness gas protective welding stick
CN105925758A (en) Lime-magnesium grain cored wire, application of lime-magnesium grain cored wire and production process for high heat input welding steel
CN105907920B (en) Improve the microalloying method of high input energy welding steel performance
CN105925757A (en) Fluorite-magnesium grain cored wire, application of fluorite-magnesium grain cored wire and production process for high heat input welding steel
CN115927952A (en) 690 MPa-grade low-welding-crack-sensitivity quenched and tempered steel with hydrogen-induced delayed fracture resistance and manufacturing method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20161012