CN106399771A - Preparation method of slow-release magnesium alloy for magnesium treatment of molten steel - Google Patents
Preparation method of slow-release magnesium alloy for magnesium treatment of molten steel Download PDFInfo
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- CN106399771A CN106399771A CN201610866175.XA CN201610866175A CN106399771A CN 106399771 A CN106399771 A CN 106399771A CN 201610866175 A CN201610866175 A CN 201610866175A CN 106399771 A CN106399771 A CN 106399771A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a preparation method of a slow-release magnesium alloy for magnesium treatment of molten steel, and belongs to the fields of steel making and preparation of alloys for steel making. The preparation method comprises the two steps of 1) Mg-Al alloy preparation: after weighing ingredients, smelting the ingredients into an Mg-Al ingot through adopting a vacuum induction furnace, and removing an oxide layer of the ingot for standby application; and 2) Mg-Al-Fe alloy preparation: after weighing ingredients, smelting the ingredients into Al-Fe alloy melt through adopting the vacuum induction furnace, after furnace cooling, adding the Mg-Al ingot into the Al-Fe alloy melt, carrying out stirring and casting, and removing an oxide layer of the ingot for standby application. According to the preparation method, the molten steel is added in an alloy form, the contents of Mg, Al and Fe are controlled to be proper, the slow-release magnesium alloy has certain dilution function on magnesium metal, and dissolution, diffusion and reaction of magnesium metal are facilitated; and metallic iron exists in the prepared magnesium alloy, so that the melting temperature of the alloy can be increased, release of magnesium metal is slowed down, the density of the alloy can be improved, and the slow-release magnesium alloy is not liable to float out of the molten steel and burn.
Description
Technical field
The invention belongs to steel-making and steel-making use alloy preparation field, particularly to a kind of molten steel magnesium process slow-release magnesium alloy
Preparation method.
Background technology
With the development of all fields of national economy, the requirement to steel performance improves constantly, in the cleanliness factor and steel of steel
The quantity of non-metallic inclusion, granularity, form and its distribution have material impact to the performance of steel.With pneumatic steelmaking, stove
The theoretical progressively development with technique of the steel-making such as outer refine and continuous casting, Cleanliness of Molten Steel controls level to improve constantly, but also there is steel
The problems such as material total oxygen content is high, inclusion size is exceeded and cleanliness factor control stability is poor, leads to finished product sheet material flaw detection qualification rate
Relatively low, stability is poor, it is relatively low to become a useful person, and seriously constrains the lifting of Business Economic Benefit.How to improve molten steel further clean
Cleanliness steel inclusion composition, granularity and its distribution are control effectively is problem demanding prompt solution.
At present, most commercial batch produce steel grade is Al deoxidization steel, and steel inclusion morphology Control mainly adopts calcium
Process combines bottom argon blowing technology, and its main purpose is Al in modified steel2O3It is mingled with, generate liquid calcium aluminate and be mingled with and promote thereon
Floating removal, thus reducing nozzle clogging tendency, improves the castability of molten steel.But in actual production, Calcium treatment Technological expression goes out
Certain limitation, is limited by liquid phase calcium aluminate physicochemical properties and rhythm of production, inclusion removal effect does not show
Write and remain in steel, and calcium aluminate field trash belongs to D class and is mingled with, and the fatigue life of some steel grades is had adverse effect.
With respect to Calcium treatment, molten steel magnesium processes and receives significant attention in recent years, and existing achievement in research shows, on the one hand, steel
Liquid magnesium processes the function with cleaning molten steel, can substantially reduce dissolved oxygen and dissolving sulfur content；On the other hand, there is rotten being mingled with
The function of thing, can go bad and generate the field trash of small and dispersed distribution, reduce the harm to rolled steel mechanical performance for the field trash；3rd,
For the welding steel such as the deck of boat and pipeline, the size of generation is tiny, the magnesium system oxide of stable components, Dispersed precipitate is mingled with can
With pinning crystal boundary in welding process, induce Intragranular Acicular Ferrite (IGF) forming core, thus being conducive to improving welding heat affected zone
(HAZ) tissue and performance.
With regard to molten steel magnesium treatment research, particularly at home, focus mostly in rationale and laboratory research stage, industry
Change application have not been reported.Think, the boiling point of magnesium metal is 1107 DEG C, without suitable feed postition, in steel-making
At a temperature of (～1600 DEG C) can gasify quickly and overflow molten steel, on the one hand, the recovery rate of magnesium metal is relatively low, magnesium treatment effect is difficult to
Ensure；Second, the spilling of magnesium steam can cause molten steel boiling splash to lead to oxygen supplement and inhale nitrogen；3rd, the magnesium metal of spilling exists
Combustion synthesis in air and pollute environment.Knowable to above-mentioned analysis, the feed postition of magnesium metal and method become molten steel magnesium and process industry
Change the restricted link of application.The present invention is exactly directed to the problems referred to above, develop a kind of magnesium alloy with slow-release function and its
Preparation method, for promotion conversion from laboratory research to industrial applications for the molten steel magnesium treatment technology, and then it is clean to improve molten steel
The mechanical performance of cleanliness and finished steel is significant with processing characteristics.
Content of the invention
For the deficiencies in the prior art, the invention provides a kind of preparation method of molten steel magnesium process slow-release magnesium alloy,
It is a kind of preparation method that can control magnesium metal Mg-Al-Fe alloy of rate of release in molten steel.The main pin of the inventive method
To the Al deoxidization steel that commodity production amount is maximum, its objective is to control rate of release in molten steel for the magnesium metal, realize magnesium metal
While fusing, while dissolve, side is reacted, thus controlling the amount of vaporization of magnesium metal, this not only improve improve magnesium metal recovery rate, improve magnesium
Treatment effect, can avoid secondary oxidation of steel again, inhale nitrogen and problem of environmental pollution.
The preparation method of the molten steel magnesium process slow-release magnesium alloy of the present invention, prepares Mg-Al-Fe alloy using two step method,
Specific as follows：
Step 1, prepared by Mg-Al alloy：
(1) raw material is chosen and burdening calculation：By the alloying component proportioning of Mg-Al, weigh metal Al and metal Mg；Wherein,
The mass percent of Mg-Al alloying component is：Mg：30～70%, balance of Al and inevitable impurity；The quality of metal Mg
For Theoretical Mass 105～110%；
(2) alloy smelting：
Using vaccum sensitive stove, metal Mg is placed on graphite crucible bottom, metal Al gland is above metal Mg；
Vaccum sensitive stove is warming up to 950～1000 DEG C, temperature-rise period evacuation, when vacuum is less than or equal to 0.01atm,
It is filled with noble gases to 0.85～0.95atm；
After molten bath is formed, broken air switch lid, quickly stirred with molybdenum bar, be poured in mould, after the demoulding, obtain Mg-Al
Alloy；
(3) alloy processing：Remove the oxide layer of Mg-Al alloy surface, standby；
Step 2, prepared by Mg-Al-Fe alloy：
(1) raw material is chosen and burdening calculation：
By Al-Fe alloying component proportioning, weigh metal Al and metal Fe；Wherein, the mass percent of Al-Fe alloying component
For：Fe：20～50%, balance of Al；
On the basis of Al-Fe alloy amount, calculate the addition of Mg-Al alloy, make Al-Fe alloy and the mixing of Mg-Al alloy
The composition of Mg-Al-Fe alloy obtaining after melting and its mass percent are：1～35%Mg, 40～80%Al, balance of Fe
With inevitable impurity；
Weigh Mg-Al alloy, wherein, the actual mass of Mg-Al alloy is the 105～110% of Theoretical Mass；
(2) Al-Fe alloy smelting：Using vacuum induction furnace smelting, metallic aluminium is placed on electrically molten magnesia crucible bottom,
Metallic iron is placed on above aluminium block；Feeding temperature-raising evacuation simultaneously, when vacuum is less than or equal to 0.01atm, is filled with indifferent gas
Body is to 0.85～0.95atm；Continue feeding temperature-raising to 1500～1550 DEG C, so that aluminum is fused completely with ferrum；
(3) Al-Fe alloy is cooled to 1100～1250 DEG C, holding alloy melt is liquid；Broken air switch lid, carries out magnesium conjunction
Aurification operates, and adds Mg-Al alloy in Al-Fe Alloy, and after the completion of alloying, power transmission stirs 1～2min, pours into
Ingot；
(4) alloy processing：The oxide layer on ingot casting surface is removed after the demoulding, standby.
In described preparation method, the metal Al weighing meets remelting aluminium ingot standard GB/T/T 1196-2008, gold
Belong to Al and select A199.50bAnd above trade mark aluminium ingot；The metal Mg weighing meets primary magnesium ingot standard GB/T/T 3499-
2011, metal Mg select Mg99.80 and above trade mark magnesium ingot；It is raw material that metallic iron adopts pure iron as raw material, meets ingot iron country mark
Quasi- GB/T 9971-2004, and select YT2 and the above trade mark；Purpose is to control impurity element in raw material to produce new dirt to molten steel
Dye.
In described step 1 (1), in Mg-Al alloy, the weight/mass percentage composition of Mg is 30～70%, is to be closed according to Mg-Al
Metallograph come determining it is ensured that no magnesium metal phase exists in alloy after cooling, to prevent in follow-up second alloying process
Gasification is it is ensured that the recovery rate of magnesium and improve operating environment.
It is considered to the scaling loss of magnesium in described step 1 (1), magnesium actual adapted amount is the 105～110% of theoretical adapted amount.
In described step 1 (2), metal Mg and metal Al is cut into bulk, is sequentially placed in graphite crucible.
In described step 1 (2), noble gases are Ar gas.
In described step 1 (2), it is filled with noble gases to vacuum induction melting interior.
In described step 1 (2) and step 2 (1), it is filled with noble gases to 0.85～0.95atm, make vacuum sky induction furnace
Interior holding tiny structure.
In described step 1 (3), grind off the oxide layer on ingot casting surface using emery wheel, and it is standby to cut into appropriate size.
In described step 1 (3), to the Mg-Al alloy cast ingot removing removing oxide layer, sampling carries out component analyses, to guarantee
Alloying component is in claimed range.
In described step 2 (1), according to Al-Fe phasor, in alfer, the mass percent of ferrum controls 20～50%
In the range of.
In described step 2 (3), in Al-Fe Alloy, the method for addition Mg-Al alloy is：Pricked using crooked chisel and take
Mg-Al alloy block, carries out alloying in insertion Al-Fe aluminium alloy, such repeatable operation, until alloying completes.
In described step 2 (3), cooling method is the cooling that has a power failure.
In described step 2 (3), low-aluminum-content Mg-Al alloy is used cooperatively with high aluminium content Al-Fe alloy, beneficial to carrying
High metal magnesium recovery rate.
In described step 2 (4), the method removing removing oxide layer is：Grind off the oxide layer on ingot casting surface using emery wheel.
In described step 2 (4), remove the Mg-Al-Fe alloy cast ingot after removing oxide layer, press-stretched is broken into powdered granule system
Standby core-spun yarn, carries out magnesium process using line feeding mode to molten steel.
The technology design of the preparation method of molten steel magnesium process slow-release magnesium alloy of the present invention is：With Mg-Al alloy phase diagram
It is foundation with Al-Fe alloy phase diagram, Mg-Al-Fe alloy is prepared using two-step method.For molten steel magnesium is processed, most suitable
Should Mg-Fe alloy, but dissolubility in iron liquid for the magnesium metal very low (when 1600 DEG C about 0.05%), after solidification, dissolubility is more
Low have the Mg-Fe alloy of enough metal content of magnesium it is difficult to be formed；Knowable to Mg-Al alloy phase diagram and Al-Fe alloy phase diagram,
Al can form the alloy of arbitrary proportion with Mg and Fe respectively that is to say, that with Al as medium, can preparing aluminium base Mg-Al-Fe and close
Gold.
The preparation method of the molten steel magnesium process slow-release magnesium alloy of the present invention, compared with prior art, has the beneficial effect that：
(1) preparation method of the present invention, adds molten steel with alloy form, controls suitable Mg, Al, Fe content, to magnesium metal
There is good dilution function, be conducive to controlling dissolving, diffusion and the reaction of magnesium metal；
(2) present invention preparation magnesium alloy in metallic iron presence, you can to put forward heavy alloyed fusion temperature, slow down metal
The release of magnesium, can put forward heavy alloyed density again, be difficult emersion molten steel and scaling loss during use.
Brief description
The process chart of the preparation method of molten steel magnesium process slow-release magnesium alloy of Fig. 1 embodiment of the present invention.
Specific embodiment
The technological process of the preparation method of molten steel magnesium process slow-release magnesium alloy of following examples is as shown in Figure 1.
In following examples, the metal Al weighing meets remelting aluminium ingot standard GB/T/T 1196-2008, metal Al
From Al99.50bAnd above trade mark aluminium ingot；The metal Mg weighing meets primary magnesium ingot standard GB/T/T 3499-2011, gold
Belong to Mg and select Mg99.80 and above trade mark magnesium ingot；It is raw material that metallic iron adopts pure iron as raw material, meets ingot iron standard GB/T/T
9971-2004, and select YT2 and the above trade mark, concrete composition is shown in Table 1：
Table 1 embodiment selects raw metal and its chemical composition (mass percent, %)
Embodiment 1
A kind of preparation method of molten steel magnesium process slow-release magnesium alloy, prepares Mg-Al-Fe alloy using two step method, specifically
As follows：
Step 1, prepared by Mg-Al alloy：
(1) raw material is chosen and burdening calculation：By the alloying component proportioning of Mg-Al, weigh 75Kg metal Al block and 79Kg gold
Belong to Mg block；Wherein, the mass percent of Mg-Al alloying component is：Mg：50%, balance of Al and inevitable impurity；Metal
The actually used amount of Mg is the 105% of Theoretical Mass；
(2) alloy smelting：
Using vaccum sensitive stove, metal Mg and metal Al is cut into after bulk, metal Mg block is placed on graphite crucible bottom
Portion, metal Al block gland is above metal Mg；
Vaccum sensitive stove is warming up to 950 DEG C, temperature-rise period evacuation, when vacuum is less than or equal to 0.01atm, it is filled with Ar
Gas, to 0.85atm, makes to keep tiny structure in vacuum sky induction furnace；
After molten bath is formed, broken air switch lid, after quickly being stirred with molybdenum bar, it is poured in steel ingot die, after the demoulding
To Mg-Al alloy；
(3) alloy processing：Grind off the oxide layer on Mg-Al alloy cast ingot surface using emery wheel, and it is standby to cut into fritter；
The chemical composition of Mg-Al alloy cast ingot is as shown in table 2；
Step 2, prepared by Mg-Al-Fe alloy：
(1) Al-Fe alloy preparation：
Raw material is chosen and burdening calculation：
By Al-Fe alloying component proportioning, weigh 150Kg metal Al and 150Kg metal Fe；Wherein, Al-Fe alloying component
Mass percent is：Fe：50%, balance of Al and inevitable impurity；
On the basis of Al-Fe alloy amount, calculate the addition of Mg-Al alloy, make Al-Fe alloy and the mixing of Mg-Al alloy
The composition of Mg-Al-Fe alloy obtaining after melting and its mass percent are：15%Mg, 55%Al, balance of Fe and can not keeping away
The impurity exempted from；
Weigh 39Kg Mg-Al alloy block；
(2) Al-Fe alloy smelting：Using vacuum induction furnace smelting, metallic aluminium is placed on electrically molten magnesia crucible bottom,
Metallic iron ferrum is placed on above aluminium block；Feeding temperature-raising evacuation simultaneously, when vacuum reaches 0.01atm, is filled with Ar gas
0.85atm, makes to keep tiny structure in vacuum sky induction furnace；Continue feeding temperature-raising to 1500 DEG C, so that aluminum is fused completely with ferrum；
(3) vaccum sensitive stove is had a power failure and be cooled to 1210 DEG C, holding alloy melt is liquid；Broken air switch lid, carries out magnesium conjunction
Aurification operates, and is pricked using crooked chisel and takes Mg-Al alloy block, inserts and carries out alloying in Al-Fe aluminium alloy, such repeatable operation, directly
To after the completion of alloying, power transmission stirs 2min, casting ingot-forming；
(4) alloy processing：Grind off the oxide layer on ingot casting surface, Mg-Al-Fe alloying manufactured in the present embodiment using emery wheel
Learn composition detection as shown in table 3.
Mg-Al-Fe alloy press-stretched prepared by the present embodiment is broken into powdered granule, bag is packaged into using sheet iron
Heart yearn, and carried out the molten steel magnesium process commerical test of 3 heats, test steel grade is AH32.Result shows, core-spun yarn fed
, only faint light in core-spun yarn feeding position in Cheng Pingwen, no molten steel splash and turn over greatly phenomenon；Molten steel composition meets steel grade
The control standard studying point requires；After magnesium is processed, nonmetallic inclusionsin steel goes bad fully, is distributed in small and dispersed state, even
Cast panel base cleanliness factor significantly improves, total oxygen content average out to 11 × 10-6, reduce more than 40% compared with Calcium treatment technique.This shows,
Prepared Mg-Al-Fe core-spun yarn has good sustained release performance, and treatment effect is good.
Embodiment 2
A kind of preparation method of molten steel magnesium process slow-release magnesium alloy, prepares Mg-Al-Fe alloy using two step method, specifically
As follows：
Step 1, prepared by Mg-Al alloy：
(1) raw material is chosen and burdening calculation：By the alloying component proportioning of Mg-Al, weigh 45Kg metal Al block and 11Kg gold
Belong to Mg block；Wherein, the mass percent of Mg-Al alloying component is：Mg：70%, balance of Al and inevitable impurity；；Gold
The quality belonging to Mg is the 105% of Theoretical Mass；
(2) alloy smelting：
Using vaccum sensitive stove, metal Mg and metal Al is cut into after bulk, metal Mg block is placed on graphite crucible bottom
Portion, metal Al block gland is above metal Mg；
Vaccum sensitive stove is warming up to 950 DEG C, temperature-rise period evacuation, when vacuum is less than or equal to 0.01atm, it is filled with Ar
Gas, to 0.9atm, makes to keep tiny structure in vaccum sensitive stove；
After molten bath is formed, broken air switch lid, quickly stirred with molybdenum bar, be poured in mould, after the demoulding, obtain Mg-Al
Alloy；
(3) alloy processing：Grind off the oxide layer on Mg-Al alloy cast ingot surface using emery wheel, and it is standby to cut into fritter；
The chemical composition of Mg-Al alloy cast ingot is as shown in table 2；
Step 2, prepared by Mg-Al-Fe alloy：
(1) Al-Fe alloy preparation：
Raw material is chosen and burdening calculation：
By Al-Fe alloying component proportioning, weigh 180Kg metal Al and 120Kg metal Fe；Wherein, Al-Fe alloying component
Mass percent is：Fe：40%, balance of Al and inevitable impurity；
On the basis of Al-Fe alloy amount, calculate the addition of Mg-Al alloy, make Al-Fe alloy and the mixing of Mg-Al alloy
The composition of Mg-Al-Fe alloy obtaining after melting and its mass percent are：10%Mg, 55%Al, balance of Fe and can not keeping away
The impurity exempted from；
Weigh 55Kg Mg-Al alloy block；
(2) Al-Fe alloy smelting：Using vacuum induction furnace smelting, metallic aluminium is placed on electrically molten magnesia crucible bottom,
Metallic iron ferrum is placed on above aluminium block；Feeding temperature-raising evacuation simultaneously, when vacuum is less than or equal to 0.01atm, is filled with Ar gas
To 0.9atm, make to keep tiny structure in vacuum sky induction furnace；Continue feeding temperature-raising to 1525 DEG C, so that aluminum is fused completely with ferrum；
(3) by vacuum induction furnace smelting, have a power failure and be cooled to 1230 DEG C, holding alloy melt is liquid；Broken air switch lid, is carried out
Magnesium alloy chemical operates, and is pricked using crooked chisel and takes Mg-Al alloy block, carries out alloying, so repeatedly grasp in insertion Al-Fe aluminium alloy
Make, after the completion of alloying, power transmission stirs 2min, casting ingot-forming；
(4) alloy processing：Grind off the oxide layer on ingot casting surface, Mg-Al-Fe alloying manufactured in the present embodiment using emery wheel
Learn composition detection as shown in table 3.
Mg-Al-Fe alloy press-stretched prepared by the present embodiment is broken into powdered granule, bag is packaged into using sheet iron
Heart yearn, and carried out the molten steel magnesium process commerical test of 5 heats, test steel grade is Q345B.Result shows, core-spun yarn feeds
Process steadily, no molten steel splash and turn over greatly phenomenon, only in the core-spun yarn feeding position faint light of appearance；Molten steel composition meets steel grade
The control standard of chemical composition requires；After magnesium is processed, nonmetallic inclusionsin steel goes bad fully, is distributed in small and dispersed state,
Continuous casting steel billet cleanliness factor significantly improves, total oxygen content average out to 13 × 10-6, reduce more than 35% compared with Calcium treatment technique.This table
Bright, prepared Mg-Al-Fe core-spun yarn has good sustained release performance, and treatment effect is good.
Embodiment 3
A kind of preparation method of molten steel magnesium process slow-release magnesium alloy, prepares Mg-Al-Fe alloy using two step method, specifically
As follows：
Step 1, prepared by Mg-Al alloy：
(1) raw material is chosen and burdening calculation：By the alloying component proportioning of Mg-Al, weigh 60Kg metal Al block and 95Kg gold
Belong to Mg block；Wherein, the mass percent of Mg-Al alloying component is：Mg：60%, balance of Al and inevitable impurity；；Gold
The quality belonging to Mg is the 105% of Theoretical Mass；
(2) alloy smelting：
Using vaccum sensitive stove, metal Mg and metal Al is cut into after bulk, metal Mg block is placed on graphite crucible bottom
Portion, metal Al block gland is above metal Mg；
Vaccum sensitive stove is warming up to 950～1000 DEG C, temperature-rise period evacuation, when vacuum is less than or equal to 0.01atm,
It is filled with Ar gas to 0.95atm, make to keep tiny structure in vacuum sky induction furnace；
After molten bath is formed, broken air switch lid, quickly stirred with molybdenum bar, be poured in mould, after the demoulding, obtain Mg-Al
Alloy；
(3) alloy processing：Grind off the oxide layer on Mg-Al alloy cast ingot surface using emery wheel, and it is standby to cut into fritter；
The chemical composition of Mg-Al alloy cast ingot is as shown in table 2；
Step 2, prepared by Mg-Al-Fe alloy：
(1) Al-Fe alloy preparation：
Raw material is chosen and burdening calculation：
By Al-Fe alloying component proportioning, weigh 180Kg metal Al and 120Kg metal Fe；Wherein, Al-Fe alloying component
Mass percent is：Fe：40%, balance of Al and inevitable impurity；
On the basis of Al-Fe alloy amount, calculate the addition of Mg-Al alloy, make Al-Fe alloy and the mixing of Mg-Al alloy
The composition of Mg-Al-Fe alloy obtaining after melting and its mass percent are：5%Mg, 53%Al, balance of Fe and can not keeping away
The impurity exempted from；
Weigh 105KgMg-Al alloy；
(2) Al-Fe alloy smelting：Using vacuum induction furnace smelting, metallic aluminium is placed on electrically molten magnesia crucible bottom,
Metallic iron ferrum is placed on above aluminium block；Feeding temperature-raising evacuation simultaneously, when vacuum is less than or equal to 0.01atm, it is filled with Ar gas
To 0.95atm, make to keep tiny structure in vacuum sky induction furnace；Continue feeding temperature-raising to 1550 DEG C, so that aluminum is fused completely with ferrum；
(3) by vacuum induction furnace smelting, have a power failure and be cooled to 1190 DEG C, holding alloy melt is liquid；Broken air switch lid, is carried out
Magnesium alloy chemical operates, and is pricked using crooked chisel and takes Mg-Al alloy block, carries out alloying, so repeatedly grasp in insertion Al-Fe aluminium alloy
Make, after the completion of alloying, power transmission stirs 2min, casting ingot-forming；
(4) alloy processing：Grind off the oxide layer on ingot casting surface, Mg-Al-Fe alloying manufactured in the present embodiment using emery wheel
Learn composition detection as shown in table 3.
Mg-Al-Fe alloy press-stretched prepared by the present embodiment is broken into powdered granule, bag is packaged into using sheet iron
Heart yearn, and carried out the molten steel magnesium process commerical test of 6 heats, test steel grade is FH40.Result shows, core-spun yarn fed
, only faint light in core-spun yarn feeding position in Cheng Pingwen, no molten steel splash and turn over greatly phenomenon；Molten steel composition meets steel grade
The control standard studying point requires；After magnesium is processed, nonmetallic inclusionsin steel goes bad fully, is distributed in small and dispersed state, even
Cast panel base cleanliness factor significantly improves, total oxygen content average out to 10 × 10-6, reduce more than 30% compared with Calcium treatment technique.This shows,
Prepared Mg-Al-Fe core-spun yarn has good sustained release performance, and treatment effect is good.
The Mg-Al alloy composition (mass percent, %) of table 2 embodiment first step preparation
The Mg-Al-Fe alloy composition (mass percent, %) of table 3 embodiment second step preparation
Claims (5)
1. a kind of preparation method of molten steel magnesium process slow-release magnesium alloy is it is characterised in that comprise the steps：
Step 1, prepared by Mg-Al alloy：
(1) raw material is chosen and burdening calculation：By the alloying component proportioning of Mg-Al, weigh metal Al and metal Mg；Wherein, Mg-Al
The mass percent of alloying component is：Mg：30～70%, balance of Al and inevitable impurity；The quality of metal Mg is reason
By quality 105～110%；
(2) alloy smelting：
Using vaccum sensitive stove, metal Mg is placed on graphite crucible bottom, metal Al gland is above metal Mg；
Vaccum sensitive stove is warming up to 950～1000 DEG C, temperature-rise period evacuation, when vacuum is less than or equal to 0.01atm, it is filled with
Noble gases are to 0.85～0.95atm；
After molten bath is formed, broken air switch lid, stirred with molybdenum bar, be poured in mould, after the demoulding, obtain Mg-Al alloy；
(3) alloy processing：Remove the oxide layer of Mg-Al alloy surface, standby；
Step 2, prepared by Mg-Al-Fe alloy：
(1) raw material is chosen and burdening calculation：
By Al-Fe alloying component proportioning, weigh metal Al and metal Fe；Wherein, the mass percent of Al-Fe alloying component is：
Fe：20～50%, balance of Al；
On the basis of Al-Fe alloy amount, calculate the addition of Mg-Al alloy, make Al-Fe alloy and Mg-Al alloy mixed smelting
The composition of Mg-Al-Fe alloy obtaining afterwards and its mass percent are：1～35%Mg, 40～80%Al, balance of Fe and not
Evitable impurity；
Weigh Mg-Al alloy, wherein, the actual mass of Mg-Al alloy is the 105～110% of Theoretical Mass；
(2) Al-Fe alloy smelting：Using vacuum induction furnace smelting, metallic aluminium is placed on electrically molten magnesia crucible bottom, by gold
Belong to ferrum to be placed on above aluminium block；Feeding temperature-raising evacuation simultaneously, when vacuum is less than or equal to 0.01atm, is filled with noble gases extremely
0.85～0.95atm；Continue feeding temperature-raising to 1500～1550 DEG C, so that aluminum is fused completely with ferrum；
(3) Al-Fe alloy is cooled to 1100～1250 DEG C, holding alloy melt is liquid；Broken air switch lid, carries out magnesium alloy chemical
Operation, adds Mg-Al alloy in Al-Fe Alloy, and after the completion of alloying, power transmission stirs 1～2min, casting ingot-forming；
(4) alloy processing：The oxide layer on ingot casting surface is removed after the demoulding, standby.
2. the preparation method of molten steel magnesium process slow-release magnesium alloy according to claim 1 is it is characterised in that described system
In Preparation Method, the metal Al weighing meets remelting aluminium ingot standard GB/T/T 1196-2008, and metal Al selects Al99.50b
And above trade mark aluminium ingot；The metal Mg weighing meets primary magnesium ingot standard GB/T/T 3499-2011, and metal Mg selects
Mg99.80 and above trade mark magnesium ingot；It is raw material that metallic iron adopts pure iron as raw material, meets ingot iron standard GB/T/T 9971-
2004, and select YT2 and the above trade mark.
3. the preparation method of molten steel magnesium process slow-release magnesium alloy according to claim 1 is it is characterised in that described step
In rapid 1 (2), noble gases are Ar gas.
4. the preparation method of molten steel magnesium process slow-release magnesium alloy according to claim 1 is it is characterised in that described step
Rapid 1 (3) and step 2 (4) in, grind off the oxide layer on ingot casting surface using emery wheel.
5. the preparation method of molten steel magnesium process slow-release magnesium alloy according to claim 1 is it is characterised in that described step
In rapid 2 (3), cooling method is the cooling that has a power failure.
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