CN105463299B - A kind of smelting process of high alumina nitrated steel - Google Patents

A kind of smelting process of high alumina nitrated steel Download PDF

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CN105463299B
CN105463299B CN201510891296.5A CN201510891296A CN105463299B CN 105463299 B CN105463299 B CN 105463299B CN 201510891296 A CN201510891296 A CN 201510891296A CN 105463299 B CN105463299 B CN 105463299B
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steel
slag
vacuum
refining
nitrated
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CN105463299A (en
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高宇波
万文华
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Changzhou Bangyi Iron and Steel Co., Ltd.
Zenith Steel Group Co Ltd
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Zenith Steel Group Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/54—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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 belongs to structural alloy steel technical field, and in particular to a kind of manufacture method of high alumina nitrated steel.The present invention uses the process route smelting high aluminium nitrated steel of EAF CONVERTER electricity converter smeltings+LF+VD+CCM, and the high alumina nitrated steel component requirements scope of gained is：C 0.35~0.40%, Si 0.20~0.30%, Mn 0.40~0.50%, Cr 1.40~1.50%, Mo 0.15~0.25, Al 0.75~1.00%, P≤0.020%, S≤0.015%, balance of Fe.Roll round steel steel it is uniform, cleanliness factor is high, performance quality is stable.

Description

A kind of smelting process of high alumina nitrated steel
Technical field
The invention belongs to structural alloy steel technical field, and in particular to a kind of manufacture method of high alumina nitrated steel.
Background technology
High alumina nitrated steel is a kind of quenched nitrided steel based on high-aluminum steel, and surface forms aluminium nitride after Nitrizing Treatment (AlN) layer, the hardness and intensity on surface are improved using the dispersion-strengtherning of aluminium nitride, and at higher temperature (600~700 DEG C) When can also keep certain hardness, while the steel grade also contain appropriate molybdenum, can effectively suppress temper brittleness, therefore, The steel grade has that quenching degree is good, temper brittleness tendency less, good high temperature process, wearability and fatigue resistance feature high.The steel Plant and be widely used in production with high-wearing feature, high-fatigue strength and sizable intensity, accurate in size nitridation zero after heat treatment Part, or various be hit load less wearability nitridation part high, such as boring bar, grinding machine spindle, automatic lathe main shaft, snails Bar, accurate lead screw, precision gear, high pressure valve, valve rod, gauge, model, roller, paranorm, cylinder block, compressor piston rod, vapour Various wearing pieces on speed regulator, turning set on turbine, fixed cover, rubber and plastic extruders etc..
It is high yet with the steel grade aluminum content, there is oxidation, fixed nitrogen during smelting, return silicon trend greatly, continuous casting production process The phenomenons such as secondary oxidation, covering slag failure easily occur, and so as to cause, Al yield is unstable, non-metallic inclusion control difficulty The problems such as increase, slag dross are generally and serious, spot segregation takes place frequently.
The content of the invention
To solve the problems, such as to be mentioned in above-mentioned background technology, the present invention is using EAF-CONVERTER electricity converter smeltings+LF+ The process route smelting high aluminium nitrated steel of VD+CCM, the high alumina nitrated steel component requirements scope of gained is：C 0.35~0.40%, Si 0.20~0.30%, Mn 0.40~0.50%, Cr 1.40~1.50%, Mo 0.15~0.25, Al 0.75~ 1.00%th, P≤0.020%, S≤0.015%, balance of Fe.
Concrete technology is：
(1) EAF-CONVERTER electricity converter smelting
At 100 tons or so, molten iron proportion is 90%, and cold burden ratio is 10%, wherein 3% is for the electric total charge weight control of converter The pig iron, remaining is high-quality steel scrap；Electric furnace is furnished with molten iron tipple, using online molten iron loading pattern, with reference to foam slag operation Technique, reaction between carbon and oxygen atmosphere in stabilization stove, reaches the purpose of de- P temperature controls；This step requirement catch carbon practice, forbids molten steel of tapping Peroxidating, goes out by composition of steel meets 0.12%≤C≤0.20%, P≤0.010% and taps, tapping temperature T >=1640 DEG C, really Protect rapid slugging；Tap is controlled at 85 ± 2 tons, to ensure Steel ladle clearance highly, it is ensured that vacuum suction is smooth；Tapping process adds Enter 150kg Al blocks and 150kg calcium carbide deoxidations, add silicomanganese, high carbon ferro-chrome and ferro-molybdenum, and add 800kg lime and The low silicon synthesis slag charge (SiO of 300kg2≤ 2.0%) slag making；Tapping latter stage strictly controls remaining steel amount (10~13 tons/stove) in stove, sternly Prohibit tapping slag, be prevented effectively from the deterioration effect of influence and refining condition of the electroslag to molten steel component (particularly P, Si)；
(2) LF refining
LF refining early stage carries out deoxidation using Al and a small amount of SiC, and middle and later periods small lot repeatedly uniformly flies away SiC to the top of the slag Slag is protected in deoxidation, keeps the reducing atmosphere of well-refined, while the addition of SiC is conducive to the slugging of LF refining early stage and ensures LF Refining latter stage high basicity slag has proper viscosity and mobility, and good slag condition is to ensure that what follow-up VD applications of vacuum were smoothed out Important foundation；First sample ingredient out adds alloy adjusting component afterwards, refining early stage adjust argon pressure to 0.4~0.6MPa (depending on Slag situation is adjusted), middle and later periods argon pressure is 0.2~0.35MPa, pressure-fired in holding furnace；10 points before refining bull ladle Clock (refining terminates first 10 minutes) reaches the target content of each element in addition to Al, Si；Aluminum steel adjustment Al content is fed before entering VD Reach before 0.100%, LF bull ladles Si controls in the lower limit of composition range, prevent vacuum largely return silicon (return silicon amount 0.03~ 0.05%) Si content control ranges are exceeded afterwards；Refining time reaches 40~70 minutes, and molten steel temperature meets the requirements, slag condition is reasonable (dual alkalinity R：9~15), i.e., bull ladle carries out application of vacuum into VD,
In step (2), it is in order to strengthen deep deoxidation effect, while being conducive to slugging that early stage adds carborundum；Middle and later periods is more Secondary addition carborundum is then the reproducibility in order to keep white slag state and keep furnace atmosphere, it is ensured that the deoxidation effect to molten steel is obtained To holding, and also allow for adjust slag condition, be follow-up VD processes be smoothed out lay the foundation；
(3) VD applications of vacuum
First time application of vacuum is first carried out during the step, high vacuum (≤67Pa) pressurize 10 minutes afterwards is evacuated to, under high vacuum It is required that clearly visible molten steel is exposed seethe, break after sky plus 8.5kg/t aluminium blocks, then vacuumize and carry out second application of vacuum, Gao Zhen Pressurize 5 minutes under reciprocal of duty cycle (≤67Pa), aluminium block stirs through argon gas and dissolves and be uniformly distributed in molten steel, so as to complete molten steel Aluminium alloying；VD vacuum process returns the control of silicon amount in the range of 0.03~0.05%；After second broken sky, the first stove of group pours in company 80 meters of pure Ca lines of feeding, carry out inclusions class, it is ensured that open the castability for pouring stove, follow-up heat is forbidden to feed Ca lines, to keep away Exempt from molten steel during line feeding and serious secondary oxidation occurs；Soft blow time >=35 minute, it is ensured that field trash fully floats in molten steel；
(4) CCM continuous castings
Continuous casting even pours the control of the heat degree of superheat at 15~25 DEG C, and the first stove degree of superheat is properly increased to 25~35 DEG C；This hair Bright steel grade continuous casting low power is also easy to produce loose, the permanent casting speed control of strict implement 0.70m/min；Casting process is covered using alkalescence Magnesia barricade is installed in agent, middle bag, black top of the slag operation is wrapped in holding, strengthen the argon gas protection between big water-coating port and long nozzle, Increase big bag collector nozzle and long nozzle seam crossing external argon ring, keep pressure-fired (0.7~0.9Pa), continuous casting mistake is reduced as far as possible The secondary oxidation of journey；Using the increasing bore mouth of a river of Φ 45mm, increase the contact area of field trash and the mouth of a river, reduce the unit mouth of a river Inclusions in inner wall area, reduce the probability of field trash aggregation dross in molten steel；In addition, it is special using high-aluminum steel Covering slag (Al2O3Content≤3.0%), there is the situation of covering slag failure to prevent casting process, and effectively in absorption molten steel Field trash, further improves the castability of molten steel, increases casting sequence.
The beneficial effects of the present invention are：In the smelting of high alumina nitrated steel, courageously enable siliceous deoxidier carborundum and promote Enter deoxygenation of liquid steel and reduce the loss of refining process aluminium, successfully solve the problems, such as silicone content, at the same time vacuum process Silicon amount is returned also to be effectively controlled；The addition of appropriate carborundum also ensure that LF refining early stage slugging effect and LF high alkalinities essence Refining finishing slag has good viscosity and mobility：Refining slag good fluidity and viscosity is suitably to prevent refining process molten steel from seriously inhaling The important foundation of gas and the follow-up VD applications of vacuum degasifying effect of guarantee, uses high basicity slag, tapping slugging effect when this steel grade is smelted Fruit and molten steel flow can not be ensured very well.Therefore, generally fluorite need to be added to promote slugging to obtain in refining stage Viscosity is suitable and the preferable slag of mobility, but although the addition of fluorite is conducive to improving slugging effect, while will also aggravate The corrosion of the resistance to material of ladle, and carborundum be added in do not corrode resistance to material on the premise of may advantageously facilitate changing for refining slag mobility It is kind, molten steel bare area and probability are reduced, while will also strengthen the foaminess of refining slag, be conducive to the refining initial stage to make foam Slag, realizes arc-covering slag operation, and the adverse effect of refining air-breathing, particularly nitrogen pick-up is further suppressed while saving power consumption.
The present invention obtains high basicity slag, the absorption that enhancing is mingled with to alundum (Al2O3) in molten steel using simplified slagging process Effect, is further ensured that molten steel cleanness；Opportunity is added by optimizing aluminium block, is realized while reducing fixed nitrogen effect higher Al yield so that this production method is more competitive in terms of cost；Continuous casting working procedure strictly carries out molding casting and using high Aluminum steel mould flux and the heavy caliber mouth of a river, realize and pour steadily connecting for many heats of high alumina steel grade.Roll round steel steel Uniformly, cleanliness factor is high, performance quality is stable.
Specific embodiment
Embodiment 1
Using the process route of EAF-CONVERTER electricity converter smelting → LF stoves refining → VD applications of vacuum → CCM continuous castings Production high alumina nitrated steel：
At 101.46 tons, hot metal ratio 90%, pig iron addition is 3.2 tons, and remaining is high-quality for the electric total charge weight control of converter Steel scrap.Tapping terminal composition C：0.12%th, P：0.008%th, tapping temperature T：1642 DEG C, 87.2 tons of tap；Tapping process adds Enter 120kg Al blocks and 110kg calcium carbide deoxidations, closed after adding silicomanganese 455kg, high carbon ferro-chrome 2148kg and molybdenum-iron 250kg to carry out stove Aurification, and add 800kg lime and the 300kg low silicon synthesis slag charge to carry out slag making；
LF refining early stage strengthens deoxidation using 80kg aluminum shots and 30kg carborundum, and argon bottom-blowing pressure is adjusted to 0.45MPa, Electrified regulation realizes white slag after 8 minutes；Take after LF first samples determine composition and add 46kg silicomanganese (FeSi18Mn68), 175kg High carbon ferro-chrome (FeCr55C10.0), 50kg molybdenum-irons (FeMo60), reach finished product target component (its of each element in addition to Al, Si Middle Si range lower limit controls on request)；When slag have been converted to white slag and alloying component substantially in place after, small lot repeatedly (8 It is secondary) it is uniform fly away SiC and protect slag to top of the slag deoxidation, 18kg altogether, argon flow amount is adjusted to 0.27MPa；Feed within 10 minutes before LF bull ladles Enter aluminum steel and adjust Al content to 0.102%, immediately VD stoves on bull ladle, 1658 DEG C of bull ladle temperature, LF refining duration 63 minutes；
An application of vacuum, and (67Pa) pressurize 10 minutes under condition of high vacuum degree are first carried out during VD treatment, sky is broken immediately, moved Except VD bells, add in 750kg aluminium blocks to molten steel, then VD bells reset, proceed secondary vacuum pumping treatment, 67Pa is simultaneously Pressurize 5 minutes.It is appropriate to increase ladle bottom blowing argon flow amount, it is ensured that the aluminium block of addition is through argon gas in secondary vacuum processing procedure Stir and be dissolved in molten steel, so as to complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 92.1%.The stove is this group first Stove, therefore 18kg (80m) pure calcium line is fed after application of vacuum, and soft blow 39 minutes, processed with carrying out inclusion modification and floating, Ensure to open the castability for pouring stove, 1572 DEG C of VD bull ladles temperature；
29 DEG C of the continuous casting degree of superheat, the constant 0.70m/min of pulling rate；Open M-EMS (150A/2Hz) and end electricity Magnetic stirs (80A/6Hz), it is ensured that molten steel uniformity；Casting process is used installs magnesia barricade in alkaline covering agent, middle bag, keep The middle black top of the slag operation of bag, strengthens the argon gas protection between big water-coating port and long nozzle, increases big bag collector nozzle and long nozzle seam Place's external argon ring, keeps pressure-fired 0.8Pa, and secondary oxidation is reduced as far as possible；Using the increasing bore of high-quality built-in type Φ 45mm The mouth of a river and high-aluminum steel mould flux, this group connects altogether pours 9 stoves, and casting cycle is steady, serious liquid fluctuating and knot does not occur Knurl phenomenon.
As the above method smelt high-aluminum steel through rolling gained round steel finished product composition be C：0.37%, Si：0.26%, Mn：0.42%, Cr：1.45%, Mo：0.21%, Al：0.85%, P：0.011%, S：0.001%, balance of Fe.
Low power Indexs measure result display centre is loose, General Loosen is 0.5 grade, and center segregation is 1.0 grades, and not There is general spot segregation and edge spot segregation, reached the standard of superfine high-quality steel in GB/T3077-1999；Metallographic is high Times detection shows that A, C class non-metallic inclusion are 0 grade, not more than 0.5 grade of B classes, not more than 1.0 grades of D classes, and oxygen contains Amount 4.3ppm, nitrogen content 33.5ppm.
Embodiment 2
Using the process route of EAF-CONVERTER electricity converter smelting → LF stoves refining → VD applications of vacuum → CCM continuous castings Production high alumina nitrated steel：
At 100.62 tons, hot metal ratio 91%, pig iron addition is 2.9 tons, and remaining is high-quality for the electric total charge weight control of converter Steel scrap.Tapping terminal composition C：0.15%th, P：0.009%th, tapping temperature T：1649 DEG C, 86.8 tons of tap；Tapping process adds Enter 150kg Al blocks and 100kg calcium carbide deoxidations, closed after adding silicomanganese 450kg, high carbon ferro-chrome 2150kg and molybdenum-iron 260kg to carry out stove Aurification, and add 750kg lime and the 200kg low silicon synthesis slag charge to carry out slag making；
LF refining early stage strengthens deoxidation using 70kg aluminum shots and 25kg carborundum, and argon bottom-blowing pressure is adjusted to 0.55MPa, Electrified regulation realizes white slag after 10 minutes；Take after LF first samples determine composition and add 50kg silicomanganese (FeSi18Mn68), 105kg High carbon ferro-chrome (FeCr55C10.0), 30kg molybdenum-irons (FeMo60), reach within 15 minutes before bull ladle in addition to Al, Si each element into Product target component (wherein Si range lower limit controls on request)；The refining middle and later periods has been converted to white slag and alloying component when slag Substantially rear small lot repeatedly uniformly flies away SiC to top of the slag deoxidation guarantor's slag in place, altogether 16kg, and argon flow amount is adjusted to 0.25MPa； 10 minutes feeding aluminum steels adjust Al content to 0.105% before LF bull ladles, immediately VD stoves on bull ladle, 1639 DEG C of bull ladle temperature, LF essences Refining duration 58 minutes；
An application of vacuum, and (≤67Pa) pressurize 12 minutes under condition of high vacuum degree are first carried out during VD treatment, sky are broken immediately, VD bells are removed, is added in 730kg aluminium blocks to molten steel, then VD bells reset, proceed secondary vacuum pumping treatment, and protect Pressure 5 minutes.It is appropriate to increase ladle bottom blowing argon flow amount, it is ensured that the aluminium block of addition is stirred through argon gas in secondary vacuum processing procedure Uniform dissolution is mixed in molten steel, so as to complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 95.2%.Soft blow 35 after application of vacuum Minute, processed with carrying out inclusion modification and floating, it is ensured that open the castability for pouring stove, 1558 DEG C of VD bull ladles temperature；
21 DEG C of the continuous casting degree of superheat, the constant 0.70m/min of pulling rate；Casting process is used installs magnesium in alkaline covering agent, middle bag Matter barricade, wraps the operation of the black top of the slag in holding, strengthen the argon gas protection between big water-coating port and long nozzle, increase big bag collector nozzle with Long nozzle seam crossing external argon ring, keeps pressure-fired 0.9Pa, and secondary oxidation is reduced as far as possible；Open M-EMS (150A/2Hz)；The increasing bore mouth of a river and high-aluminum steel mould flux using high-quality built-in type Φ 45mm, this group connects altogether pours 8 Stove, casting cycle is steady, serious liquid fluctuating and dross phenomenon does not occur；
As the above method smelt high-aluminum steel through rolling obtained by the finished product composition of round steel be controlled to C：0.38%, Si： 0.27%, Mn：0.44%, Cr：1.43%, Mo：0.21%, Al：0.86%, P：0.012%, S：0.001%, balance of Fe.
Low power Indexs measure result display General Loosen is 0.5 grade, center porosity and center segregation are 1.0 grades, is not gone out Now general spot segregation and edge spot segregation, have equally reached the standard of superfine high-quality steel in GB/T3077-1999；Metallographic High power detection shows that A, B, C class non-metallic inclusion are 0 grade, not more than 1.0 grades of D classes, oxygen content 2.5ppm, nitrogen substantially Content 36.0ppm.
Embodiment 3
Using the process route of EAF-CONVERTER electricity converter smelting → LF stoves refining → VD applications of vacuum → CCM continuous castings Production high alumina nitrated steel：
At 101.81 tons, hot metal ratio 95%, pig iron addition is 2.6 tons, and remaining is high-quality for the electric total charge weight control of converter Steel scrap.Tapping terminal composition C：0.13%th, P：0.008%th, tapping temperature T：1646 DEG C, 85.7 tons of tap；Tapping process adds Enter 150kg Al blocks and 100kg calcium carbide deoxidations, closed after adding silicomanganese 445kg, high carbon ferro-chrome 2140kg and molybdenum-iron 250kg to carry out stove Aurification, and add 700kg lime and the low silicon synthetic slags of 100kg to carry out slag making；
LF refining early stage strengthens deoxidation using 85kg aluminum shots and 35kg carborundum, and argon bottom-blowing pressure is adjusted to 0.52MPa, Lime 100kg is added, electrified regulation realizes white slag after 10 minutes；Take after LF first samples determine composition and add 20kg silicomanganese (FeSi18Mn68), 120kg high carbon ferro-chromes (FeCr55C10.0), 40kg molybdenum-irons (FeMo60), reach and remove for 15 minutes before bull ladle The finished product target component (wherein Si range lower limit controls on request) of each element beyond Al, Si；The refining middle and later periods has turned when slag Be changed into white slag and alloying component substantially in place after small lot repeatedly uniformly fly away SiC and protect slag, altogether 15kg, argon to top of the slag deoxidation Throughput is adjusted to 0.22MPa；10 minutes feeding aluminum steels adjust Al content to 0.098% before LF bull ladles, immediately VD stoves on bull ladle, 1640 DEG C of bull ladle temperature, LF refining duration 59 minutes；
An application of vacuum, and (≤67Pa) pressurize 10 minutes under condition of high vacuum degree are first carried out during VD treatment, sky are broken immediately, VD bells are removed, is added in 730kg aluminium blocks to molten steel, then VD bells reset, proceed secondary vacuum pumping treatment, and protect Pressure 5 minutes.It is appropriate to increase ladle bottom blowing argon flow amount, it is ensured that the aluminium block of addition is stirred through argon gas in secondary vacuum processing procedure Uniform dissolution is mixed in molten steel, so as to complete the aluminium alloying of molten steel, the aluminium block rate of recovery is 94.5%.Soft blow 32 after application of vacuum Minute, 1563 DEG C of VD bull ladles temperature；
23 DEG C of the continuous casting degree of superheat, the constant 0.70m/min of pulling rate；Open M-EMS (150A/2Hz) and end electricity Magnetic stirs (50A/6Hz), it is ensured that molten steel uniformity；Casting process is used installs magnesia barricade in alkaline covering agent, middle bag, keep The middle black top of the slag operation of bag, strengthens the argon gas protection between big water-coating port and long nozzle, increases big bag collector nozzle and long nozzle seam Place's external argon ring, keeps pressure-fired 0.8Pa, and secondary oxidation is reduced as far as possible；Using the increasing bore mouth of a river of built-in type Φ 45mm And high-aluminum steel mould flux, this group connects altogether pours 9 stoves, and casting cycle is steady, serious liquid fluctuating does not occur and dross is existing As；
As the above method smelt high-aluminum steel through rolling obtained by the finished product composition of round steel be controlled to C：0.39%, Si： 0.24%, Mn：0.45%, Cr：1.46%, Mo：0.19%, Al：0.84%, P：0.010%, S：0.001%, balance of Fe.
Low power Indexs measure result display centre is loose, General Loosen, center segregation are 0.5 grade, general point does not occur Shape segregation and edge spot segregation, have reached the standard of superfine high-quality steel in GB/T3077-1999；The detection of metallographic high power shows A classes, B classes, D classes non-metallic inclusion are no more than 0.5 grade, and C classes are 0 grade, oxygen content 3.0ppm, nitrogen content 33.7ppm.

Claims (4)

1. a kind of manufacture method of high alumina nitrated steel, it is characterised in that：Described manufacture method is using EAF-CONVERTER electricity The process route smelting high aluminium nitrated steel of converter smelting+LF+VD+CCM, concretely comprises the following steps,
(1) EAF-CONVERTER electricity converter smelting
According to the weight of 90% molten iron, 3% pig iron, 7% high-quality steel scrap than loading electric converter, using catch carbon practice, forbid Steel Molten Steel over-oxidation, goes out by composition of steel meets 0.12%≤C≤0.20%, P≤0.010% and taps, tapping temperature T >=1640 DEG C, the 83~87% of charge weight, tapping process adds Al blocks and calcium carbide deoxidation for tap control, adds silicomanganese, high carbon ferro-chrome And ferro-molybdenum, and lime and the synthesis slag charge slag making of low silicon are added, tapping latter stage strictly controls remaining steel amount in stove, forbids tapping Slag,
Wherein, molten iron, the pig iron, total charge weight of high-quality steel scrap are 100 tons, tapping process add Al blocks 150kg, calcium carbide 150kg, Lime 800kg, low silicon synthesis slag charge 300kg；
(2) LF refining
LF refining early stage carries out deoxidation using Al and SiC, and the middle and later periods uniformly flies away SiC to top of the slag deoxidation guarantor's slag, keeps reduction Property atmosphere, refining early stage adjusts argon pressure to 0.4~0.6MPa, and middle and later periods argon pressure is 0.2~0.35MPa, and refining is hung The preceding target content for reaching each element in addition to Al, Si for 10 minutes of bag；Feeding aluminum steel adjustment Al content reaches before entering VD In the lower limit of composition range, refining time is 40~70 minutes, and bull ladle is carried out into VD for Si controls before 0.100%, LF bull ladle Application of vacuum；
(3) VD applications of vacuum
First carry out first time application of vacuum, be evacuated to≤high vacuum of 67Pa after pressurize 10 minutes, required under high vacuum clearly visible Molten steel is exposed to seethe, and breaks after sky plus 8.5kg/t aluminium blocks, then be evacuated to≤high vacuum of 67Pa after pressurize carry out second within 5 minutes Secondary application of vacuum, aluminium block stirs through argon gas and dissolves and be uniformly distributed in molten steel, so as to complete the aluminium alloying of molten steel；VD is true Null process returns the control of silicon amount in the range of 0.03~0.05%；After second broken sky, the first stove that group is poured by company feeds 80 meters of pure Ca Line, carries out inclusions class, it is ensured that open the castability for pouring stove, follow-up heat is forbidden to feed Ca lines, to avoid molten steel during line feeding There is serious secondary oxidation；Field trash fully floats during soft blow ensures molten steel；
(4) CCM continuous castings
Continuous casting even pours heat head stoves degree of superheat control at 25~35 DEG C, and remaining even pours the control of the heat degree of superheat at 15~25 DEG C, permanent Casting speed control is 0.70m/min；Casting process uses alkaline covering agent, is protected using argon gas between big bag collector nozzle and long nozzle Shield, and keep the pressure-fired of 0.7~0.9Pa；Using the increasing bore mouth of a river of Φ 45mm, and high-aluminum steel mould flux.
2. the manufacture method of high alumina nitrated steel as claimed in claim 1, it is characterised in that：Low silicon described in step (1) is closed The SiO into slag charge2Mass content≤2.0%.
3. the manufacture method of high alumina nitrated steel as claimed in claim 1, it is characterised in that：High-aluminum steel described in step (4) Al in mould flux2O3Mass content≤3.0%.
4. the manufacture method of high alumina nitrated steel as claimed in claim 1, it is characterised in that：During soft blow described in step (3) Between >=35 minutes.
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