CN102181606A - Rare earth aluminum manganese calcium iron alloy and production method thereof - Google Patents
Rare earth aluminum manganese calcium iron alloy and production method thereof Download PDFInfo
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Abstract
The invention discloses a rare earth aluminum manganese calcium iron alloy and a production method thereof, belonging to the technical field of steel smelting deoxidier. The alloy comprises the following components by weight percent: 40-70% of Al, 5-20% of Mn, 1-10% of RE, 1-3% of Ca, not less than 5% of other residual elements, and the balance of Fe, wherein, the RE is rare-earth Ce, La or at least contains one mixed rare earth of Ce and La; the content of Ce and La in the mixed rare earth is not less than 90%; other residual elements are the mixed elements of carbon, sulfur, phosphorus and silicon in the alloy smelting process; and the preparation process flows are as follows: selecting materials, preparing the materials, charging, melting, deslagging, pouring, weighing and storing into a warehouse. The invention has the advantages of realizing strong deoxidation effect and high functional element yield; the rare earth aluminum manganese calcium iron alloy is easily removed as the impurity particle generated in the molten steel is large, is not only the strong deoxidizer, but also an additive of the alloy, and also can be used as intermediate alloy.
Description
Technical field
The invention belongs to the steel making deoxidant technical field, a kind of rare-earth aluminum-manganese Ca-Fe alloy and production method thereof particularly are provided.
Background technology
Deoxidation is the important process link of steel making working procedure.The wherein selection of reductor and add quantitative relation to the sex change of converter smelting endpoint control, slag, requirement, the inclusion modification of composition are handled and the change of continuous casting casting properties etc.In addition, the character of deoxidation products (mainly being oxide compound, sulfide) and shape and quantity all can produce very big influence to the machinery and the physical and chemical performance of steel, in actual production process, need to spray into some solid solvent to molten steel, it is denaturing agent, the character that is present in the non-metallic inclusion that solidifies in the molten steel as changes such as silico-calcium, rare earth alloies, reach the disadvantageous effect of eliminating or reducing them, and the castability that improves molten steel.Along with the fast development and the cut-throat competition of domestic Iron And Steel Industry, steelworks has proposed more and more high requirement to reductor: wish that deoxidation efficient height, inclusion remove easily; While yield of alloy height, comprehensive cost is low.
Metallic aluminium is strong reductor, and aluminium and oxygen have very strong avidity, has deoxidation to decide nitrogen in steel-making, and crystal grain thinning is prevented the timeliness of soft steel, improves the beneficial effects such as low-temperature flexibility of steel, by extensively as the end-deoxidizer of killed steel.But because the fusing point of metallic aluminium is low, density is little, be easy to oxidation at high temperature again, therefore adopt common adding method (throw-in play or interpolation) to be difficult to be added to the molten steel deep, aluminium block swims in molten steel surface easily, and generation aluminium is floating and wrap up in the slag phenomenon, and aluminium scaling loss in molten steel is big, the recovery rate of aluminium is very low, the deoxidation effect instability wants to control in the steel relatively difficulty of residual aluminum content, has influenced the quality of foundry goods.Simultaneously, during with the aluminium block final deoxygenation, its deoxidation products Al
2O
3Be the polygon inclusion of band wedge angle, discharge, will in steel, gather that be chain along crystal boundary and distribute, to the mechanical property of steel casting, especially toughness produces bigger influence if can not in time from molten steel, float.
Calcium is a kind of active alkaline element.Fusing point is that 850 ℃, boiling point are 1438 ℃. skin has two electronics, and is stronger than the avidity of aluminium and oxygen with the avidity of oxygen, in other words very easily with oxygen generation oxidizing reaction, and deoxidizing capacity is higher than aluminium.The existence of calcium has improved the deoxidizing capacity of aluminium, when promptly reaching same deoxidation effect, reduces the meltage---consumption of aluminium at molten steel, and the existence of aluminium has simultaneously also reduced the deoxidation consumption of strong oxidizer calcium and the volatilization loss of calcium, produces more Al when avoiding secondary oxidation
2O
3Be mingled with and stop up the mouth of a river.
Rare earth has the intensive deoxidation effect to molten steel, its deoxidizing capacity is significantly greater than aluminium, it is big to produce inclusion particle simultaneously, in molten steel, float easily, and the existence of a certain amount of remaining solid solution rare earth is played unique metallurgical effect to the improvement of key propertys such as some high-quality steel toughness, wear resistance, erosion resistance in the steel.Although these superiority of rare earth are extensively admitted by people, rare earth uses at steelworks and is faced with following difficulty: the easy oxidation of (1) rare earth, be difficult for adding in the steel, and cause the recovery rate of rare earth low; (2) add-on of rare earth is difficult to accurate quantification; (3) re inclusion of Sheng Chenging is difficult for floating from molten steel than great; Be easy to generate nozzle clogging when (4) casting, be difficult to guarantee that continuous casting production is carried out smoothly.The existence of these problems has limited the enthusiasm that enterprise uses rare earth.
Summary of the invention:
The object of the present invention is to provide a kind of rare-earth aluminum-manganese Ca-Fe alloy and production method thereof, overcome the deficiency of employed reductor in the above-mentioned molten steel smelting process, realized that deoxidation effect is strong, functional element recovery rate height, the big rare-earth aluminum-manganese Ca-Fe alloy of removing easily of inclusion particle that in molten steel, produces, it is strong reductor, be again the additive of alloy, can use as master alloy again.
The composition of rare-earth aluminum-manganese Ca-Fe alloy of the present invention (being weight percentage) is:
Aluminium Al:40～70%, Mn 5～20%, RE1～10%, Ca 1～3%; Other residual element weight is not more than 5%, and surplus is Fe
Described RE is meant rare earth cerium Ce, lanthanum La or contains a kind of mishmetal among Ce, the La at least that the content of Ce, La is no less than 90% in mishmetal.
Described other residual element are meant elements such as the carbon of sneaking into, sulphur, phosphorus, silicon in the alloy smelting process.
The preparation method of rare-earth aluminum-manganese Ca-Fe alloy of the present invention:
Utilize fine aluminium ingot, rare earth, calcium metal, mid-carbon fe-mn, angle bar in medium-frequency induction furnace or line frequency induction furnace, to prepare the rare-earth aluminum-manganese Ca-Fe alloy for raw material.
Batching: material composition: aluminium ingot (99.7～99.9%Al), rare earth (90～98%RE), calcium metal (98～99%Ca), mid-carbon fe-mn (surplus is Fe for 75～82%Mn, 0.7～2%C), angle bar
Technical process:
Technical process is: select materials prepare burden-feed-melt-remove the gred-build-weighing-finished product warehouse-in
Operation steps:
(1) aluminium ingot 85～90 weight %: the ratio of calcium metal 10～15 weight % adds in the induction furnace and heated 35～50 minutes, and temperature remains on 750～850 ℃, comes out of the stove to pour mould into and cast bulk, and naturally cooling is made high kalzium metal.
(2) aluminium ingot 85～90 weight %: the ratio of rare earth 10～15 weight % adds in the induction furnace and heated 35～50 minutes, and temperature remains on 750～850 ℃, comes out of the stove to pour mould into and cast bulk, and naturally cooling is made rare earth aluminium alloy.
(3) angle bar 25～35 weight %: heated 30～40 minutes in the ratio adding induction furnace of mid-carbon fe-mn 5～15 weight %, temperature remains on 1550～1650 ℃, add high kalzium metal 25～35 weight % that step (1) makes again, rare earth aluminium alloy 25～35 weight % that step (1) makes, smelted 15～25 minutes, and closed power supply, add the aluminium ingot of 2～4 weight %, naturally cool to 1050～1150 ℃ and come out of the stove and pour mould into and cast bulk, naturally cooling is made the rare-earth aluminum-manganese Ca-Fe alloy.
Advantage of the present invention is:
(1) proportion of rare-earth aluminum-manganese Ca-Fe alloy is higher by 3.86 than the proportion of pure Al, and is easy to use, and deoxidation is stable, shoots straight, and does not have particular requirement in the smelting operation, reduces labor intensity.
(2) rare-earth aluminum-manganese Ca-Fe alloy, composition apolegamy rationally are convenient to transportation and are preserved not efflorescence.
(3) rare earth and sulphur have very strong affinity, and the effect of desulfurization is arranged, and improve the effect of the impelling strength of steel.
(4) the steel grade waste product of smelting with the rare-earth aluminum-manganese Ca-Fe alloy is few, and cost is low, and is profitable.
(5) with rare-earth aluminum-manganese Ca-Fe alloy instead of pure AL deoxidation, remarkable effect is arranged, make inclusion area percent mean value descend 38% changing inclusion morphology.Total number of unit inner area inclusion on average descends 39%, inclusion distribution of sizes mean value decline 58-63%.
(6) for smelting rimming steel and requiring acid to melt the steel grade of aluminium (Als), better effects if
Embodiment (embodiment will give occurrence, so the scope that you are given all changes concrete value into, marks with blueness, if do not conform to the actual conditions, please revise)
Embodiment 1:
(1) aluminium ingot 85%: the ratio of calcium metal 15% added in the induction furnace heating 45 minutes, and temperature remains on 850 ℃, came out of the stove to pour mould into and cast bulk, and naturally cooling is made high kalzium metal.
(2) aluminium ingot 90%: the ratio of rare earth 10% added in the induction furnace heating 38 minutes, and temperature remains on 820 ℃, came out of the stove to pour mould into and cast bulk, and naturally cooling is made rare earth aluminium alloy.
(3) angle bar 55%: heating is 33 minutes in the ratio adding induction furnace of mid-carbon fe-mn 7%, temperature remains on 1620 ℃, add the high kalzium metal 15% that makes: rare earth aluminium alloy 20% was smelted 22 minutes, close power supply, the aluminium ingot of adding 3%, naturally cool to 1090 ℃ and come out of the stove and pour mould into and cast bulk, naturally cooling is made the rare-earth aluminum-manganese Ca-Fe alloy.The chemical ingredients of the rare-earth aluminum-manganese Ca-Fe alloy that makes: (being weight percentage):
Surplus is Fe.
Embodiment 2:
(1) aluminium ingot 90%: the ratio of calcium metal 10% added in the induction furnace heating 40 minutes, and temperature remains on 840 ℃, came out of the stove to pour mould into and cast bulk, and naturally cooling is made high kalzium metal.
(2) aluminium ingot 86%: the ratio of rare earth 14% added in the induction furnace heating 40 minutes, and temperature remains on 800 ℃, came out of the stove to pour mould into and cast bulk, and naturally cooling is made rare earth aluminium alloy.
(3) angle bar 10%: heating is 35 minutes in the ratio adding induction furnace of mid-carbon fe-mn 8%, temperature remains on 1600 ℃, add the high kalzium metal 20% that makes: rare earth aluminium alloy 60% was smelted 20 minutes, close power supply, the aluminium ingot of adding 2%, naturally cool to 1100 ℃ and come out of the stove and pour mould into and cast bulk, naturally cooling is made the rare-earth aluminum-manganese Ca-Fe alloy.The chemical ingredients of the rare-earth aluminum-manganese Ca-Fe alloy that makes: (being weight percentage):
Surplus is Fe.
Claims (3)
1. a rare-earth aluminum-manganese Ca-Fe alloy is characterized in that, the composition weight percentage of this alloy is:
Aluminium Al:40～70%, Mn 5～20%, RE1～10%, Ca 1～3%; Other residual element weight is not more than 5%, and surplus is Fe; Described RE is meant rare earth cerium Ce, lanthanum La or contains a kind of mishmetal among Ce, the La at least that the content of Ce, La is no less than 90% in mishmetal; Described other residual element are meant carbon, sulphur, phosphorus, the element silicon of sneaking in the alloy smelting process.
2. the preparation method of the described rare-earth aluminum-manganese Ca-Fe alloy of claim 1, technical process is: select materials prepare burden-feed-melt-remove the gred-build-weighing-finished product warehouse-in; It is characterized in that the technical parameter of controlling is in processing step:
(1) aluminium ingot 85～90 weight %: the ratio of calcium metal 10～15 weight % adds in the induction furnace and heated 35～50 minutes, and temperature remains on 750～850 ℃, comes out of the stove to pour mould into and cast bulk, and naturally cooling is made high kalzium metal;
(2) aluminium ingot 85～90 weight %: the ratio of rare earth 10～15 weight % adds in the induction furnace and heated 35～50 minutes, and temperature remains on 750～850 ℃, comes out of the stove to pour mould into and cast bulk, and naturally cooling is made rare earth aluminium alloy;
(3) angle bar 25～35 weight %: heated 30～40 minutes in the ratio adding induction furnace of mid-carbon fe-mn 5～15 weight %, temperature remains on 1550～1650 ℃, add high kalzium metal 25～35 weight % that step (1) makes again, rare earth aluminium alloy 25～35 weight % that step (1) makes, smelted 15～25 minutes, and closed power supply, add the aluminium ingot of 2～4 weight %, naturally cool to 1050～1150 ℃ and come out of the stove and pour mould into and cast bulk, naturally cooling is made the rare-earth aluminum-manganese Ca-Fe alloy.
3. the preparation method of rare-earth aluminum-manganese Ca-Fe alloy according to claim 2 is characterized in that, aluminium ingot: 99.7～99.9 weight %Al, rare earth: 90～98 weight %RE, calcium metal: 98～99 weight %Ca, mid-carbon fe-mn: 75～82 weight %Mn, 0.7～2 weight %C, surplus is Fe.
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| CN2011100879918A CN102181606B (en) | 2011-04-08 | 2011-04-08 | Production method of rare earth aluminum manganese calcium iron alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778060A (en) * | 2019-03-26 | 2019-05-21 | 内蒙古锦和稀土功能材料有限公司 | Rare earth alloy and its preparation method and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489427A1 (en) * | 1990-12-05 | 1992-06-10 | Sumitomo Metal Industries, Ltd. | Surface-coated aluminum material |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
| CN101092657A (en) * | 2007-07-20 | 2007-12-26 | 谢应凯 | Rare earth aluminum based composite alloy in use for steel making |
| CN101104875A (en) * | 2007-08-14 | 2008-01-16 | 包头市神润特种合金股份有限公司 | Rare-earth aluminum-manganese-titanium-iron alloy |
| CN101519747A (en) * | 2009-03-11 | 2009-09-02 | 爱德洛（北京）科技有限公司 | Rare-earth aluminum-calcium-iron alloy |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489427A1 (en) * | 1990-12-05 | 1992-06-10 | Sumitomo Metal Industries, Ltd. | Surface-coated aluminum material |
| CN101086028A (en) * | 2007-07-13 | 2007-12-12 | 谢应凯 | Composite deoxidizing agent aluminum-calcium-iron alloy for smelting steel |
| CN101092657A (en) * | 2007-07-20 | 2007-12-26 | 谢应凯 | Rare earth aluminum based composite alloy in use for steel making |
| CN101104875A (en) * | 2007-08-14 | 2008-01-16 | 包头市神润特种合金股份有限公司 | Rare-earth aluminum-manganese-titanium-iron alloy |
| CN101519747A (en) * | 2009-03-11 | 2009-09-02 | 爱德洛（北京）科技有限公司 | Rare-earth aluminum-calcium-iron alloy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778060A (en) * | 2019-03-26 | 2019-05-21 | 内蒙古锦和稀土功能材料有限公司 | Rare earth alloy and its preparation method and application |
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