CN106756077A - A kind of high temperature alloy electroslag remelting slag system and its application method - Google Patents
A kind of high temperature alloy electroslag remelting slag system and its application method Download PDFInfo
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- CN106756077A CN106756077A CN201610971398.2A CN201610971398A CN106756077A CN 106756077 A CN106756077 A CN 106756077A CN 201610971398 A CN201610971398 A CN 201610971398A CN 106756077 A CN106756077 A CN 106756077A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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Abstract
The present invention provides a kind of high temperature alloy electroslag remelting slag system, and the weight percent proportioning of its chemical composition is：CaF2：47 53%, Al2O3：20 25%, CaO：17 22%, MgO：4 6%, TiO2：1 3%, HfO2：1 4%；Remaining is FeO, C and impurity.Adopt in this way, add 1 4% HfO2, suppress the scaling loss of hafnium element, prevent the composition tolerances of electroslag ingot hafnium element end to end, using the slag system remelting high temperature alloy, the rate of recovery such as Al, Ti, Hf is high, reaches 92 to 98%, the high-temperature alloyed steel ingot surface quality smelted with the slag system is good, without slag runner defect；The molten speed stabilization of reflow process, reduces the degree of segregation of hafnium element, improves the recovery rate of hafnium.
Description
Technical field
The present invention relates to electroslag remelting field, in particular, be related to a kind of high temperature alloy electroslag remelting slag system and its
Application method.
Background technology
At present in advanced aero-engine, powder metallurgy superalloy due to showing a series of superior property at high temperature
Can and turn into manufacture thrust-weight ratio high, the preferred material of the low oil consumption aero-engine key hot-end component turbine disk.Hf is used as one kind
Special trace element, can enter γ ' and MC carbide, change alloying element Ti, Cr, W, Mo alloy it is alternate point
Match somebody with somebody, promote the high-temperature stability of γ '.Therefore from American-European countries in the optimizing components design for developing three generations's powder metallurgy superalloy,
With the continuous improvement of alloying level, using addition Hf as the important alloying means for improving alloy property comprehensively.
In powder metallurgy superalloy field, Russian powder metallurgy superalloy uses VIM or VIM+VAR double melting techniques；It is beautiful
State's powder metallurgy superalloy uses the smelting technologies of VIM+ESR+VAR tri-；And up to the present China's powder temperature conjunction uses VIM substantially
Single sweetening process, this is the one of the main reasons for causing China's powder turbine disk degree of purity not yet to be reached advanced world standards.Beijing
Aeronautical material research institute shown using the result of study of VIM+ESR duplex technique melting powder metallurgy superalloys FGH96, duplex technique
The degree of purity of foundry alloy is improved, the quantity of non-metallic inclusion is reduced, the size of field trash is reduced, the lifting to performance
There is greatly improvement.Therefore preparing powder foundry alloy using duplex and three techniques can be greatly improved the performance of the turbine disk.
Electroslag remelting (ESR) can regard the method that refined metals are carried out with electrical heating slag, wherein slag system, proportioning and slag as
The selection of amount is to particularly critical.Current remelting electroslag main component is CaF2、CaO、MgO、Al2O3、SiO2And TiO2Deng being made
The raw material of industry is fluorite, lime, magnesia, commercial alumina, quartz sand, titanium dioxide.Composition according to remelted ingot is to it
Carry out the proportioning of even five yuan of ternary, quaternary.The steel for special purposes such as electroslag remelting steel containing Ti and steel containing Mg, usually adds one in slag
Quantitative TiO2Or MgO, the scaling loss of titanium or magnesium in steel is suppressed so as to reach, improve the purpose of its recovery rate.U.S. G.K. Barts
(Bhat) 70%CaF is used2- 20%Al2O3- 10%TiO2Maraging steel of the slag remelting containing Ni18%.Japanese remelting
A286 high temperature alloys use slag 55%CaF2+ 35%Al2O3+ 10%TiO2, use 50%CaF2+ 20%CaO+20%Al2O3+ 10%
TiO2Slag remelting CTSUS321 steel, Ti recovery rates>90%.Domestic researcher also studied five yuan of similar slag systems, effectively
Reduce the segregation of Ti and Mg and rare earth element in special steel.
It is domestic on the research containing hafnium high-temperature alloy electroslag process is basic or blank, using existing five yuan of slag systems
(CaF2-Al2O3-CaO-MgO-TiO2) to carrying out electroslag remelting containing hafnium high-temperature alloy, although the segregation of Al, Ti is under control,
But element hafnium occurs different degrees of segregation at the position of electrode bar upper, middle and lower three, its degree of segregation is more than 60%, to alloy
Mechanical behavior under high temperature produce greatly adverse effect.
Therefore, the segregation problems containing hafnium high-temperature alloy hafnium element in esr process how are solved, reduces segregation journey
Degree, improves the recovery rate of hafnium, the problem as urgent need to resolve.
The content of the invention
The invention provides a kind of high temperature alloy electroslag remelting slag system and its application method, to solve to contain hafnium high-temperature alloy
The segregation problems of hafnium element in esr process, reduce degree of segregation, improve the recovery rate of hafnium.
The purpose of the present invention is achieved through the following technical solutions：
A kind of high temperature alloy electroslag remelting slag system, the weight percent of its chemical composition matches and is：
CaF2：47-53%, Al2O3：20-25%, CaO：17-22%, MgO：4-6%, TiO2：1-3%, HfO2：1-4%；
Remaining is FeO, C and impurity.
Preferably, in the slag system, by weight percentage：FeO≤0.2%, C≤0.025%.
A kind of a kind of application method of high temperature alloy electroslag remelting slag system described above, including：
Step one, fritting or purification are carried out to slag system, make FeO≤0.2% in slag system, C≤0.025%；
Step 2, the slag system after purification is heated in oven；
Step 3, the slag system obtained in 0.5 ± 0.1kg step 2 is placed in the striking box, and with high temperature alloy of the same race
Car is considered 0.5 ± 0.1kg to be worth doing and is mixed；
The slag system of step 4, the total quantity of slag 10 ± 1% placed around the striking box on the crystallizer of bottom in step 3, by residue
Slag system is placed on and feed automatically in slag device, and protection melting is carried out to argon gas is passed through in protective cover；
Step 5, power transmission decline electrode arc striking and are no less than 5 minutes, and the slag system fed in slag device is uniformly added into crystallizer,
Wherein slugging voltage 20-50V, electric current 6000-10000A, plus 15-30 minutes slag time；
After step 6, slag systemization are clear, into melting stage, the molten speed of precise control；
After step 7, melting terminate, steel ingot cool time continues to cover cold 24h more than the demoulding after 40min.
Preferably, the heating-up temperature in step 2 is 700-750 DEG C, and the heat time is not less than 4 hours.
Preferably, the flow that step 4 is passed through argon gas is 3-5L/min.
Preferably, speed is melted in step 6 to be specially：V=(0.5-0.6) D, wherein, V is molten speed, units/kg/h；D is crystallization
The diameter of device or steel ingot, unit mm.
High temperature alloy electroslag remelting slag system in the present invention is due to the weight percent proportioning of its chemical composition：CaF2：
47-53%, Al2O3：20-25%, CaO：17-22%, MgO：4-6%, TiO2：1-3%, HfO2：1-4%；Remaining is FeO, C
With impurity.Adopt the HfO for adding 1-4% in this way2, suppress the scaling loss of hafnium element, prevent electroslag ingot hafnium element end to end
Composition tolerances, using the slag system remelting high temperature alloy, the rate of recovery such as Al, Ti, Hf is high, reaches 92 to 98%, with the slag system smelting
The high-temperature alloyed steel ingot surface quality of refining is good, without slag runner defect；The molten speed stabilization of reflow process, melts speed fluctuation and is less than 0.1kg/min,
The degree of segregation of hafnium element is reduced, the recovery rate of hafnium is improved.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme is explicitly described, it is clear that described embodiment is a part of embodiment of the invention, without
It is whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not before creative work is made
The every other embodiment for being obtained is put, the scope of protection of the invention is belonged to.
The present invention discloses a kind of high temperature alloy electroslag remelting slag system, and the weight percent proportioning of its chemical composition is：
CaF2：47-53%, Al2O3：20-25%, CaO：17-22%, MgO：4-6%, TiO2：1-3%, HfO2：1-4%；
Remaining is FeO, C and impurity.
In the present embodiment, specifically proportioning can be for example to weight (or quality) percentage of slag system：
CaF2：47%, Al2O3：20%, CaO：17%, MgO：4%, TiO2：1%, HfO2：1%；Remaining be FeO, C with it is miscellaneous
Matter.FeO, C and other impurities can be more in this proportioning, need to remove more FeO, C and other impurities when purification or melting.
In the present embodiment, specifically proportioning can also be for example to weight (or quality) percentage of slag system：
CaF2：49%, Al2O3：22.5%, CaO：19.5%, MgO：5%, TiO2：1.5%, HfO2：1.5%；Remaining is
FeO, C and impurity.This proportioning FeO, C and other impurities can be more less, when purification or melting advantageously.
In the present embodiment, specifically proportioning can also be for example to weight (or quality) percentage of slag system：
CaF2：50%, Al2O3：21.2%, CaO：18%, MgO：4.5%, TiO2：1.5%, HfO2：4%；Remaining is
FeO, C and impurity.This proportioning FeO, C and other impurities can be more less, when purification or melting advantageously.
In the present embodiment, specifically proportioning can also be for example to weight (or quality) percentage of slag system：
CaF2：51%, Al2O3：20.1%, CaO：17.5%, MgO：5.1%, TiO2：3%, HfO2：2.5%；Remaining is
FeO, C and impurity.This proportioning FeO, C and other impurities can be more less, when purification or melting advantageously.
Certainly, the scope that the proportioning of each composition is limited in the present embodiment in the present embodiment, is not defined as specifically
The percentage for dividing.
In order to advantageously in purification or melting, in the slag system, by weight percentage：FeO≤0.2%, C≤
0.025%.So impurity can be less, is conducive to purification.
According to an embodiment of the present, a kind of a kind of user of high temperature alloy electroslag remelting slag system described above
Method, can be processed a kind of any of the above-described slag system of proportioning, including：
Step one, fritting or purification are carried out to slag system, make FeO≤0.2% in slag system, C≤0.025%；
Step 2, the slag system after purification is heated in oven；
Step 3, the slag system obtained in 0.5 ± 0.1kg step 2 is placed in the striking box, and with high temperature alloy of the same race
Car is considered 0.5 ± 0.1kg to be worth doing and is mixed；
The slag system of step 4, the total quantity of slag 10 ± 1% placed around the striking box on the crystallizer of bottom in step 3, by residue
Slag system is placed on and feed automatically in slag device, and protection melting is carried out to argon gas is passed through in protective cover；
Step 5, power transmission decline electrode arc striking and are no less than 5 minutes, and the slag system fed in slag device is uniformly added into crystallizer,
Wherein slugging voltage 20-50V, electric current 6000-10000A, plus 15-30 minutes slag time；
After step 6, slag systemization are clear, into melting stage, the molten speed of precise control；
After step 7, melting terminate, steel ingot cool time continues to cover cold 24h more than the demoulding after 40min.
Processed using above-mentioned steps, added the HfO of 1-4%2, suppress the scaling loss of hafnium element, prevent the Electro Slag Remelting Steel head of ingot
The composition tolerances of tail hafnium element, using the slag system remelting high temperature alloy, the rate of recovery such as Al, Ti, Hf is high, reaches 92 to 98%,
The high-temperature alloyed steel ingot surface quality smelted with the slag system is good, without slag runner defect；The molten speed stabilization of reflow process, molten speed fluctuation is less than
± 0.1kg/min, reduces the degree of segregation of hafnium element, improves the recovery rate of hafnium.
In this implementation, the heating-up temperature in step 2 is 700-750 DEG C, and the heat time is not less than 4 hours.So can be more
Good carrying out purifies.
In this implementation, the flow that step 4 is passed through argon gas is 3-5L/min.Slag system can be protected using this flowing velocity,
And argon gas is saved, economy is more preferable.
Speed is melted in this implementation, in step 6 to be specially：V=(0.5-0.6) D, wherein, V is molten speed, units/kg/h；D is knot
The diameter of brilliant device or steel ingot, unit mm.Thus can be according to specific crystallizer or the molten speed of steel ingot adjustment, convenient treatment.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Specific implementation of the invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should be all considered as belonging to of the invention
Protection domain.
Claims (6)
1. a kind of high temperature alloy electroslag remelting slag system, the weight percent proportioning of its chemical composition is：
CaF2：47-53%, Al2O3：20-25%, CaO：17-22%, MgO：4-6%, TiO2：1-3%, HfO2：1-4%；
Remaining is FeO, C and impurity.
2. a kind of high temperature alloy electroslag remelting slag system according to claim 1, it is characterised in that in the slag system, with
Percentage by weight meter：FeO≤0.2%, C≤0.025%.
3. a kind of a kind of application method of high temperature alloy electroslag remelting slag system as claimed in claim 1 or 2, its feature exists
In, including：
Step one, fritting or purification are carried out to slag system, make FeO≤0.2% in slag system, C≤0.025%；
Step 2, the slag system after purification is heated in oven；
Step 3, the slag system obtained in placement 0.5 ± 0.1kg step 2 in striking box, and considered to be worth doing with high temperature alloy car of the same race
0.5 ± 0.1kg mixes；
The slag system of step 4, the total quantity of slag 10 ± 1% placed around the striking box on the crystallizer of bottom in step 3, by remaining slag system
It is placed on and feed automatically in slag device, protection melting is carried out to argon gas is passed through in protective cover；
Step 5, power transmission decline electrode arc striking and are no less than 5 minutes, and the slag system fed in slag device is uniformly added into crystallizer, wherein
Slugging voltage 20-50V, electric current 6000-10000A, plus 15-30 minutes slag time；
After step 6, slag systemization are clear, into melting stage, the molten speed of precise control；
After step 7, melting terminate, steel ingot cool time continues to cover cold 24h more than the demoulding after 40min.
4. a kind of application method of high temperature alloy electroslag remelting slag system according to claim 3, it is characterised in that step
Heating-up temperature in two is 700-750 DEG C, and the heat time is not less than 4 hours.
5. a kind of application method of high temperature alloy electroslag remelting slag system according to claim 3, it is characterised in that step
Four flows for being passed through argon gas are 3-5L/min.
6. a kind of application method of high temperature alloy electroslag remelting slag system according to claim 3, it is characterised in that step
Speed is melted in six to be specially：V=(0.5-0.6) D, wherein, V is molten speed, units/kg/h；D is the diameter of crystallizer or steel ingot, unit
mm。
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Cited By (4)
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| CN109536733A (en) * | 2018-12-13 | 2019-03-29 | 西安聚能高温合金材料科技有限公司 | A kind of pre-melted slag of high temperature alloy electroslag remelting |
| CN111004976A (en) * | 2019-12-30 | 2020-04-14 | 钢铁研究总院 | Nickel-saving type air valve alloy and preparation method thereof |
| CN111705219A (en) * | 2020-06-30 | 2020-09-25 | 重庆钢铁研究所有限公司 | Slag system for electroslag remelting high-titanium high-silicon stainless steel and preparation method thereof |
| CN113278834A (en) * | 2021-05-24 | 2021-08-20 | 大冶特殊钢有限公司 | VIM furnace smelting method of ultrahigh N content high-temperature alloy |
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| CN113278834A (en) * | 2021-05-24 | 2021-08-20 | 大冶特殊钢有限公司 | VIM furnace smelting method of ultrahigh N content high-temperature alloy |
| CN113278834B (en) * | 2021-05-24 | 2022-03-08 | 大冶特殊钢有限公司 | VIM furnace smelting method of ultrahigh N content high-temperature alloy |
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Application publication date: 20170531 |