CN109280738A - Large-sized high-temperature alloy casting metal smelt method - Google Patents

Large-sized high-temperature alloy casting metal smelt method Download PDF

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CN109280738A
CN109280738A CN201811383757.8A CN201811383757A CN109280738A CN 109280738 A CN109280738 A CN 109280738A CN 201811383757 A CN201811383757 A CN 201811383757A CN 109280738 A CN109280738 A CN 109280738A
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temperature alloy
furnace
alloy casting
steel ingot
casting
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王茂庭
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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
    • 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
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • 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
    • 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
    • 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

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  • 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 the large-sized high-temperature alloy casting metal smelt methods that one kind can disposably produce the molten steel that several tonnes meet large-sized high-temperature alloy castings desire.The smelting process, comprising the following steps: 1) equipment is transformed, determines the formula of high-temperature alloy casting material requested；2) the small steel ingot of multiple requirements for meeting large high-temperature casting is smelted, small steel ingot gross mass is 110% ~ 120% of steel quality needed for large-sized high-temperature alloy casting；3) it removes small steel ingot to improve quality poor region, is sub-partitioned into small powder, is put into Large Electric Furnace and is smelted；4) obtained molten steel will be smelted to pour into progress deoxidation, decarburization in ladle refining furnace, H, N is gone to handle, ladle chemistry will be adjusted；Until ladle chemistry meets large high-temperature castings desire；5) molten steel is carried out to the casting of large-sized high-temperature alloy casting.Large-tonnage high quality high temperature alloy molten steel can be disposably provided using the smelting process, realizes the production of large-sized high-temperature alloy casting.

Description

Large-sized high-temperature alloy casting metal smelt method
Technical field
The present invention relates to a kind of smelting process of high-temperature alloy casting, especially a kind of large-sized high-temperature alloy casting metal smelting Smelting method.
Background technique
Well known: high temperature alloy has the characteristics that structure stability is good, elevated temperature strength is high, anti-oxidant, corrosion-resistant, answers extensively For departments such as aviation, the energy and chemical industry.But since high temperature alloy alloying level is high, control of element narrow range, degree of purity It is required that the features such as high, smelting difficulty is very big, and with the required increase for smelting high temperature alloy tonnage, difficulty be increased dramatically.
Large-sized high-temperature alloy casting net weight can reach 20 tons or so, need a large amount of high temperature alloy molten steel, but at present High temperature alloy smelting process, very such as the methods of vaccum sensitive stove+ladle refining furnace or intermediate frequency furnace+ladle refining furnace VOD Difficulty reaches.Since the equipment capacities such as current vaccum sensitive stove, intermediate frequency furnace are limited, and the reasons such as involve great expense only are fitted For the smelting of a small amount of high temperature alloy, several tonnes of high temperature alloy molten steel can not be disposably obtained.Electric furnace+ladle refining furnace VOD It is the main metallurgical method of current large-scale steel class casting, 800 tons or so of molten steel at most can be disposably provided, but by It is more difficult in chemical component and control of deleterious element, the originals such as furnace melting furnace charge and ladle refining furnace (VOD decarburization) difficulty are big Cause cannot achieve the direct smelting of a large amount of high temperature alloys.The quality of high temperature alloy molten steel directly determines that large-sized high-temperature alloy is cast The quality of part can not disposably obtain large-tonnage high quality high temperature alloy molten steel and constrain the development of large-sized high-temperature alloy casting.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of large-sized high-temperature alloy casting metal smelt method, the smeltings Method can disposably produce the several tonnes of molten steel for meeting large-sized high-temperature alloy castings desire.
The technical solution adopted by the present invention to solve the technical problems is: large-sized high-temperature alloy casting metal smelt method, The following steps are included:
1) it transform general EAR remelting furnace as electroslag furnace with vacuum function, the vacuum system of ladle refining furnace is risen Grade, so that the vacuum degree of ladle refining furnace is less than 66.7pa；According to the requirement of high-temperature alloy casting chemical component and smelting process mistake The empirical value of the scaling loss situation of alloying element determines the formula of high-temperature alloy casting casting material requested in journey；
2) high-temperature alloy casting is cast material requested to smelt by electroslag refining furnace into multiple small steel ingots, the small steel ingot meets The requirement of large high-temperature casting；Small steel ingot gross mass is 110%~120% of steel quality needed for large-sized high-temperature alloy casting；
3) chemical composition analysis is carried out to small steel ingot, the second-rate region in small steel ingot both ends end and surface oxide layer is gone It removes, then small steel ingot is divided into and meets Large Electric Furnace smelting to the small powder of steel ingot lumpiness, quality requirement, be put into Large Electric Furnace It is smelted；
4) molten steel after smelting Large Electric Furnace, which pours into ladle refining furnace, to be smelted, and molten steel is carried out deoxidation, decarburization, removes H, N Processing is examined ladle chemistry, and is adjusted according to high-temperature alloy casting standard to ladle chemistry；Until molten steel Chemical component meets large high-temperature castings desire；
5) molten steel is carried out to the casting of large-sized high-temperature alloy casting.
Further, general EAR remelting furnace is being transform as electroslag furnace with vacuum function in step 1), to steel The vacuum system of packet refining furnace is upgraded, so that further including following step after the vacuum degree of ladle refining furnace is less than 66.7pa Suddenly, remaining iron in ladle refining furnace and Large Electric Furnace furnace is cleaned using nickel.
Preferably, the multiple small steel ingots of vacuum consumable+electric slag refusion and smelting are used in step 2).
Preferably, it polishes in step 3) electroslag ingot surface, removes small surface of steel ingot oxide layer.
The beneficial effects of the present invention are: large-sized high-temperature alloy casting metal smelt method of the present invention, big smelting When molten steel needed for type high-temperature alloy casting, the small steel ingot for meeting large-sized high-temperature alloy casting parameter and standard out is smelted first, then Small steel ingot is smelted in Large Electric Furnace, and carries out the adjusting of chemical component to obtained molten steel, so that final disposable Obtain the molten steel for meeting large-sized high-temperature alloy casting.Therefore the degree of purity of metal is improved, sulfur content and nonmetal inclusion are reduced Object, the smelting process simple process, production are convenient, can disposably provide large-tonnage high quality high temperature alloy molten steel, thus real The production of existing large-sized high-temperature alloy casting.
Specific embodiment
Below with reference to embodiment, the present invention is further described.
Large-sized high-temperature alloy casting metal smelt method, comprising the following steps:
1) it transform general EAR remelting furnace as electroslag furnace with vacuum function, the vacuum system of ladle refining furnace is risen Grade, so that the vacuum degree of ladle refining furnace is less than 66.7pa；According to the requirement of high-temperature alloy casting chemical component and smelting process mistake The empirical value of alloying element scaling loss situation determines the formula of high-temperature alloy casting casting material requested in journey；
2) high-temperature alloy casting is cast material requested to smelt by electroslag refining furnace into multiple small steel ingots, the small steel ingot meets The requirement of large-sized high-temperature alloy casting, small steel ingot gross mass be large-sized high-temperature alloy casting needed for steel quality 110%~ 120%；
3) chemical composition analysis is carried out to small steel ingot, the second-rate region in small steel ingot both ends end is removed, then small steel ingot is divided It is cut into and meets Large Electric Furnace smelting to the small powder of steel ingot lumpiness, quality requirement, be put into Large Electric Furnace and smelted；
4) molten steel after smelting Large Electric Furnace, which pours into ladle refining furnace, to be smelted, and molten steel is carried out deoxidation, decarburization, removes H, N Processing is examined ladle chemistry, and is adjusted according to high-temperature alloy casting standard to ladle chemistry；Until molten steel Chemical component meets large-sized high-temperature alloy castings desire；
5) molten steel is carried out to the casting of large-sized high-temperature alloy casting.
Large-sized high-temperature alloy casting metal smelt method master of the present invention equipment to be used include electroslag refining furnace, Ladle refining furnace and Large Electric Furnace.
Electroslag refining furnace is transformed in step 1), so that electroslag refining furnace is the electroslag furnace with vacuum function. Therefore the deaeration capacity that electroslag refining furnace can be improved, can be reduced to lower water for H, O, N in the steel ingot formed in electroslag furnace It is flat.The vacuum system of ladle refining furnace is upgraded, so that the vacuum degree of ladle refining furnace is less than 66.7pa.So that molten steel Carried out in ladle refining furnace further deoxidation carbon elimination processing when vacuum degree it is low, biggish negative pressure can be formed in furnace, by steel Gas in water is sucked out, and can guarantee that C, H, O, N are reduced to lower level.
According to alloying element scaling loss feelings in the requirement of high-temperature alloy casting chemical component and Steelmaking in step 1) The empirical value of condition determines the formula of high-temperature alloy casting casting material requested.It is required by high-temperature alloy casting chemical component true Determine the chemical component contained in smelting molten steel material requested；Pass through the experience of alloying element scaling loss situation in Steelmaking The model and type of value selection material, so that alloying element meets the requirement of the scaling loss in smelting process in the material of selection.
The empirical value of alloying element scaling loss situation refers to the smelting according to knowhow in molten steel in the Steelmaking The scaling loss ratio that the data of various alloying element scaling loss situations are counted during refining.The alloying element scaling loss is Refer to that the oxide that oxidation reaction generates, the oxidization burning loss of generation occur for the oxygen in alloying element and atmosphere, molten steel and clinker； Alloying element scaling loss situation refers to the scaling loss ratio of alloying element.Alloying element mainly includes Al, Ti, B, the oxidizable member such as Ni, Cr Element.Such as the scaling loss of Al is than referring to that the Al mass that Al is oxidized in entire smelting process is to be initially added into Al mass for 60% 60%.Clinker is eventually become since the alloy after being burnt forms oxide, cannot be entered in molten steel；It therefore must root Amount according to the scaling loss of alloying element than calculating addition alloying element guarantees that the content of respective alloy element in molten steel meets greatly The requirement of type high-temperature alloy casting.
High-temperature alloy casting casting material requested is smelted into multiple small steel ingots by electroslag refining furnace in step 2), it is described Small steel ingot meets the requirement of large-sized high-temperature alloy casting, and small steel ingot gross mass is steel quality needed for large-sized high-temperature alloy casting 110%~120%.
The small steel ingot refers to that the tonnage of steel ingot is less than the tonnage of large-sized high-temperature alloy casting, i.e. a large-sized high-temperature alloy The quality of casting is equivalent to the quality of several small steel ingots.It is described that high-temperature alloy casting casting material requested is passed through into electroslag remelting Furnace smelts multiple small steel ingots, and the requirement that the small steel ingot meets large-sized high-temperature alloy casting, which refers to, casts high-temperature alloy casting Chemical component and the element composition for multiple small steel ingots that material requested is smelted by electroslag refining furnace meet large-sized high-temperature alloy casting The requirement of part chemical component and element composition, the ginseng for the large-sized high-temperature alloy casting that the parameters and needs of small steel ingot are cast Number is consistent.
Since electroslag refining furnace is transformed in step 1, the electroslag furnace obtained after transformation has vacuum function, so that Deoxidation, decarburization etc. is more thorough, simultaneously because therefore molten steel that the steel ingot for smelting small tonnage needs to smelt is less；It is smelting Other impurities element can be avoided to enter in molten steel with the chemical component in strict control molten steel in the process, smelt small steel out Chemical component and element composition in ingot meet the design standard of large-sized high-temperature alloy casting.Small steel ingot gross mass is large-scale high 110%~120% of steel quality needed for temperature alloy casting；It is because small steel ingot will be remelted to form steel in the next steps Water, small steel ingot, which melts the molten steel to be formed, will be used for casting large-scale high-temperature alloy casting；Therefore the quality of molten steel must be greater than casting Make the quality of molding large-sized high-temperature alloy casting.Small steel ingot gross mass is steel quality needed for large-sized high-temperature alloy casting 110%~120%, while considering molten steel and inevitably consuming and lose in casting process；Guarantee to have enough Pouring molten steel molding large high-temperature alloy casting.
Chemical composition analysis is carried out to small steel ingot in step 3), by the second-rate region in small steel ingot both ends end and table The removal of face oxide layer, then small steel ingot is divided into and meets Large Electric Furnace smelting to the small powder of steel ingot width, quality requirement, it is put into It is smelted in Large Electric Furnace.
The Large Electric Furnace refers to electric furnace of the production tonnage at 10 tons or more.Small steel ingot carries out chemical composition analysis, be for All small steel ingots of guarantee meet the requirements, and avoid the large-sized high-temperature alloy casting that do not meet due to being formed when castable from pouring The small steel ingot that note requires enters in next technique, when eventually leading to the molten steel needed for smelting large-sized high-temperature alloy casting pouring, Molten steel is scrapped.
The second-rate region in small steel ingot both ends end and surface oxide layer are removed, small steel ingot both ends end quality Poor region refer to steel ingot both ends end occur hole, it is loose, be oxidized part there are mass defect.The part is cut off It is in order to avoid being mixed into a small amount of harmful element and impurity in the part and entering eventually into castable large-sized high-temperature alloy casting In molten steel.To advantageously reduce the adjustment and removal objectionable impurities that need to carry out chemical component to molten steel in subsequent step Difficulty.
Small steel ingot is divided into again and meets Large Electric Furnace smelting to the small powder of steel ingot lumpiness, quality requirement, is put into large-scale electricity It is smelted in furnace；It is in order to enable small steel ingot can quickly smelt into molten steel in Large Electric Furnace, while guarantee in small steel ingot The scaling loss situation of various alloying elements is in allowed limits.
In step 4), the molten steel after Large Electric Furnace is smelted, which pours into ladle refining furnace, to be smelted, and molten steel is taken off Oxygen, decarburization go H, N to handle, and examine ladle chemistry, and carry out to ladle chemistry according to high-temperature alloy casting standard Adjustment；Until ladle chemistry meets large high-temperature castings desire.Ladle refining furnace has carried out technology in step 1) and has changed It makes, so that the vacuum degree of ladle refining furnace is lower, the vacuum stability that can be formed in ladle refining furnace is good, thus right Molten steel carries out deoxidation, decarburization, H, N is gone to handle, and H, O, N can be made to be reduced to lower level, while impurity can be prevented first Element, which is mixed into, causes ladle chemistry not conform to.It carries out deoxidation, decarburization to molten steel, go H, N processing to be in order to enable in removal molten steel Impurity and harmful element.Ladle chemistry is examined, and ladle chemistry is adjusted according to high-temperature alloy casting standard It is whole；Until ladle chemistry meets large high-temperature castings desire；It is in order to enable molten steel can finally meet large high-temperature casting Part requirement.
Molten steel is carried out to the casting of large-sized high-temperature alloy casting in step 5)；Ultimately form large high-temperature casting.
Large-sized high-temperature alloy casting metal smelt method of the present invention by step 1) by general EAR remelting Furnace transform the electroslag furnace with vacuum function as, therefore chemistry in the small steel ingot smelted in step 2) by electroslag furnace Ingredient purity is high, and nitrogen content is low in small steel ingot, and oxygen content is low.Due to will need to smelt into large-sized high-temperature alloy in step 2) The material of casting is smelted first into small steel ingot.Its chemical component is adjusted in the smelting process of small steel ingot, while to small Gaseous impurity in steel ingot is extracted by vacuum, so that the gaseous impurity content in small steel ingot is low.Small steel ingot is carried out Decarburization, deoxidation, so that the chemical composition in small steel ingot meets the requirement of the chemical composition of large-sized high-temperature alloy casting.Then exist Small steel ingot is put into Large Electric Furnace in step 3) and is smelted, molten steel is obtained, chemistry is being carried out to molten steel in step 4 The adjustment of element and further decarburization, deoxidation go H, N to handle, so that the harmful substance in molten steel is less, So that C in molten steel, 0, the content of H, N it is lower, can be good at the chemical component for controlling molten steel.
The present invention will need to smelt to be smelted first at the material of large-sized high-temperature alloy casting at small steel ingot, in the smelting of small steel ingot The chemical component of material adjust and control for the first time during refining, and harmful element and gaseous impurity have been carried out Removal.Since the molten steel amount that the casting of small steel ingot needs is smaller, to the change in molten steel during the smelting of small steel ingot Control and the adjusting for learning element are all relatively easy and mature, can be good at controlling the gaseous impurity and harmful element in molten steel. So that the purity of small steel ingot is higher.Then multiple small steel ingots are melted in the next steps in Large Electric Furnace and obtains steel Then molten steel is poured into ladle refining furnace again and carries out deoxidation, decarburization, H, N is gone to handle, and closed according to large high-temperature by water Golden casting standard is adjusted ladle chemistry.Therefore it is equivalent to the molten steel for needing to carry out large-sized high-temperature alloy casting The removal of the adjustment of chemical component and gaseous impurity and harmful element twice is carried out.So as to disposably obtain big ton Position high quality high temperature alloy molten steel, realizes the production of large-sized high-temperature alloy casting.
Electric furnace+ladle refining furnace VOD is the main metallurgical method of current large-scale steel class casting in the prior art, at most may be used Disposably to provide 800 tons or so of molten steel, but since chemical component and control of deleterious element are more difficult, furnace melting The reasons such as the decarburization difficulty of furnace charge and ladle refining furnace VOD is big, cannot achieve the direct smelting of a large amount of high temperature alloys.The steel Packet refining furnace VOD refers to the ladle refining furnace that alloying component is finely tuned under oxygen blast under vacuum, decarburization, vacuum degassing, vacuum.Steel Packet refining furnace VOD is mainly used for refining super-low carbon stainless steel and electrical pure iron etc..However large-sized high-temperature alloy of the present invention Casting metal smelt method is by transforming general EAR remelting furnace as electroslag furnace with vacuum function, to ladle refining furnace Vacuum system upgraded so that the vacuum degree of ladle refining furnace be less than 66.7pa effectively improve electroslag furnace and ladle essence The oxygen blast of furnace, decarburization, vacuum degassed ability also improve electroslag since carbon will form carbide gas in high temperature The decarburization capacity of furnace and ladle refining furnace.Simultaneously the material that will need to smelt into large-sized high-temperature alloy casting smelt first at Small steel ingot carries out the control of first time chemical component and the removal of objectionable impurities when producing small steel ingot.So that needing smelting The chemical component for being smelt the material of large-sized high-temperature alloy casting is identical as chemical component needed for large-sized high-temperature alloy casting, simultaneously So that the harmful element for needing to smelt in the material of large-sized high-temperature alloy casting, gaseous impurity and phosphorus content are lower.Cause This carries out deoxidation, decarburization again in step 4), H, N is gone to handle, and examines ladle chemistry, and according to high-temperature alloy casting The steel quality that standard obtains after being adjusted to ladle chemistry is higher.By technological transformation to equipment, to needing smelting The material for being smelt large-sized high-temperature alloy casting carries out adjusting and take off again to chemical component in small ingot smelting and step 4 Oxygen, decarburization, to enable smelting process of the present invention disposably to obtain large-tonnage high-quality for the synergistic effect for going H, N to handle High temperature alloy molten steel is measured, realizes the production of large-sized high-temperature alloy casting.
In order to enable guaranteeing when high temperature alloy is smelted Fe content 5% hereinafter, by general EAR remelting furnace in step 1) It transform the electroslag furnace with vacuum function as, the vacuum system of ladle refining furnace is upgraded, so that ladle refining furnace is true It is further comprising the steps of after reciprocal of duty cycle is less than 66.7pa, it is cleaned using nickel remaining in ladle refining furnace and Large Electric Furnace furnace Iron.Remaining iron in ladle refining furnace and Large Electric Furnace furnace is cleaned by nickel so that ladle refining furnace and big Remaining iron block is removed in type electric furnace, and remaining iron in furnace is avoided to be smelted in ladle refining furnace and Large Electric Furnace When, influence the content of molten steel Fe in furnace.
In order to reduce cost, small steel ingot is more quickly smelted, while the small steel ingot obtained meets related request.Step 2) Middle to use the multiple small steel ingots of vacuum consumable+electric slag refusion and smelting, the small steel ingot meets large-sized high-temperature alloy castings desire.It is small Steel ingot can be obtained using a variety of methods, such as vacuum consumable+electroslag remelting, vacuum induction+electroslag remelting etc..Using vacuum Consumable+electroslag remelting smelting process smelts small steel ingot since vacuum consumable+electric slag refusion and smelting method uses vacuum to molten steel Carry out deoxidation, carbon elimination, degassing, therefore the gas content in molten steel is few, molten steel purity is high, enable to the chemistry of small steel ingot at Divide purity higher.
In order to remove on small steel ingot there are mass defect and the part being oxidized, small surface of steel ingot is carried out in step 3) Polishing, removes small surface of steel ingot oxide layer.There are can lead to when mass defect and the part being oxidized on removing small steel ingot Over mechanical processing can also pass through polishing.Since machining needs special purpose machine tool, higher cost, therefore general use is beaten Mill, reduces cost.

Claims (4)

1. large-sized high-temperature alloy casting metal smelt method, it is characterised in that the following steps are included:
1) it transform general EAR remelting furnace as electroslag furnace with vacuum function, the vacuum system of ladle refining furnace is risen Grade, so that the vacuum degree of ladle refining furnace is less than 66.7pa；According to the requirement of high-temperature alloy casting chemical component and smelting process mistake The empirical value of the scaling loss situation of alloying element determines the formula of high-temperature alloy casting casting material requested in journey；
2) high-temperature alloy casting is cast material requested to smelt by electroslag furnace into multiple small steel ingots, the small steel ingot meets large-scale The requirement of high temperature casting；Small steel ingot gross mass is 110%~120% of steel quality needed for large-sized high-temperature alloy casting；
3) chemical composition analysis is carried out to small steel ingot, the second-rate region in small steel ingot both ends end and surface oxide layer is gone It removes, then small steel ingot is divided into and meets Large Electric Furnace smelting to the small powder of steel ingot lumpiness, quality requirement, be put into Large Electric Furnace It is smelted；
4) molten steel after smelting Large Electric Furnace, which pours into ladle refining furnace, to be smelted, and molten steel is carried out deoxidation, decarburization, removes H, N Processing is examined ladle chemistry, and is adjusted according to high-temperature alloy casting standard to ladle chemistry；Until molten steel Chemical component meets large high-temperature castings desire；
5) molten steel is carried out to the casting of large-sized high-temperature alloy casting.
2. large-sized high-temperature alloy casting metal smelt method as described in claim 1, it is characterised in that: incited somebody to action in step 1) General EAR remelting furnace transform the electroslag furnace with vacuum function as, upgrades to the vacuum system of ladle refining furnace, so that It is further comprising the steps of after the vacuum degree of ladle refining furnace is less than 66.7pa, ladle refining furnace and large-scale electricity are cleaned using nickel Remaining iron in furnace furnace.
3. large-sized high-temperature alloy casting metal smelt method as described in claim 1, it is characterised in that: used in step 2) The multiple small steel ingots of vacuum consumable+electric slag refusion and smelting.
4. large-sized high-temperature alloy casting metal smelt method as described in claim 1, it is characterised in that: to electricity in step 3) Slag surface of steel ingot is polished, and small surface of steel ingot oxide layer is removed.
CN201811383757.8A 2018-11-20 2018-11-20 Large-sized high-temperature alloy casting metal smelt method Withdrawn CN109280738A (en)

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Application publication date: 20190129