CN101787452A - Preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and device thereof - Google Patents
Preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and device thereof Download PDFInfo
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- CN101787452A CN101787452A CN 201010125493 CN201010125493A CN101787452A CN 101787452 A CN101787452 A CN 101787452A CN 201010125493 CN201010125493 CN 201010125493 CN 201010125493 A CN201010125493 A CN 201010125493A CN 101787452 A CN101787452 A CN 101787452A
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Abstract
The invention discloses a preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and a device thereof; the high-purity aluminum and calcium are used as the raw material and are prepared according to the weight percent as follows: 70-90 percent of aluminum and 10-30 percent calcium; the calcium is added to the aluminum which is molten by a low-frequency sensing induction furnace, the aluminum and the calcium are molten for 30-40 minutes under the protection of argon gas and then cast into an ingot; after being cooled, the ingot is broken into blocks to prepare the aluminum-calcium alloy. The invention has the advantages that the alloy has high purity and high calcium content and is used for vacuum refining molten steel deoxidation; the deoxidation and calcium can be completed in one step; the O, C, N, S ingredients in the steel are ensured not to exceed the standard requirement; meanwhile, the Al2O3 inclusion content in the steel is greatly reduced, thereby having the obvious effects of reducing nodulation at a pouring water gap and improving steel quality.
Description
One, technical field
The present invention relates to refine guiding principle alloy reductor, particularly a kind of preparation method and device for the RH aluminum-calcium alloy used for vacuum refining molten steel deoxidation.
Two, background technology
Along with fast development of national economy, industries such as automobile, household electrical appliances are increasing to the demand of steel, and quality is also more and more higher.How to produce Ultra-low carbon (C＜30 * 10 of satisfying high-grade auto sheet and tame electroplax requirement
-6), ultralow nitrogen (N＜30 * 10
-6), ultralow oxygen (O＜30 * 10
-6) and super low sulfur (S＜50 * 10
-6) steel is an important subject of Iron and Steel Enterprises in China always.
Produce above-mentioned high-grade automobile and household electrical appliances steel at present, generally adopt vacuum decarburization, deoxidation method.Very high (external producer is generally 200 * 10 to oxygen level in the molten steel after the vacuum-treat
-6～300 * 10
-6, domestic manufacturer is generally 300 * 10
-6～500 * 10
-6), oxygen level be dropped to 30 * 10
-6Below, be to rely on that a large amount of metallic aluminium of input carries out deoxidation in the molten steel, so in molten steel, will produce a large amount of solid phase Al
2O
3Deoxidation products.Because Al
2O
3Surface tension little, be difficult for adsorbing mutually, grow up, float and to remove, not only cause taking place in the casting process the serious mouth of a river " dross " phenomenon, influence connects waters the stove number, reduction productivity, and these Al
2O
3In case enter in the steel billet, can in steel, form fragility and be mingled with, directly influence the mechanical property and the surface quality of steel.
Theoretical according to steel-making, reduce Al in the molten steel
2O
3The measure of deoxidation products content is the molten steel after the deoxidation to be carried out calcium handle.Promptly with calcium metal with deoxidation products Al
2O
3Carry out modification, make it to become low-melting 7Al
2O
3.12CaO, the latter's soon, easily grow up come-up and removing of poly-speed of wadding a quilt with cotton is even there is small amount of residual also can not cause big influence to steel performance in steel.
Best in theory calcium treatment agent yes pure metal calcium, but have the little (1.55g/cm of density because of calcium
2), drop in the molten steel be difficult for sinking, fusing point (838 ℃) and boiling point (1450 ℃) is low, meet very easily characteristics such as oxidation of air, simple calcium metal is dropped into behind the molten steel meeting does not have effect in the very fast gasification of molten steel surface, volatilization loss.So simple calcium metal can not use as the calcium treatment agent.Smelt common steel grade at present, the way that calcium line (including the cored-wire of calcium metal) is fed in general employing is carried out calcium and is handled.
Solved the problem that adds the calcium metal existence merely though feed calcium line, but calcium is handled the problem of bringing after using it for the vacuum refinement deoxidation, Here it is: carbon content and nitrogen content through molten steel after the vacuum-treat have been controlled in the standard range, if feed calcium line, because the foreskin of calcium line is to be made by soft steel, the carbon content of molten steel is increased, can make the carbon component content of steel exceed standard conversely; Simultaneously, single calcium metal enters molten steel and can cause that the molten steel fierceness seethes in the calcium line, and the contact area of molten steel and air is increased, and causes the nitrogen content of molten steel to increase, and makes the nitrogen component content of steel also can exceed standard.Therefore, at producing high-grade automobile and household electrical appliances steel plate, solve Al in the steel with the way of feeding calcium line
2O
3Be mingled with infeasible.
Vacuum refinement is used under the situation of calcium treatment agent at present needleless still, the steel mill of domestic employing RH vacuum refinement can only take the molten steel after the vacuum-treat deoxidation is kept long period " calmness ", to allow Al as much as possible
2O
3Poly-, the come-up of deoxidation products wadding.But this way can not fundamentally solve Al in the steel
2O
3Be mingled with and continous casting sprue " dross " problem.
Can the dual needs in view of molten steel vacuum decarburization processing back deoxidation and calcium processing provide a kind of kalzium metal, behind the molten steel vacuum decarburization it added in the RH vacuum unit, deoxidation of molten steel and calcium are handled are carried out simultaneously?
To this problem, theoretic answer is sure.But used kalzium metal requires the calcium contents height, and it is high that purity is also wanted, and how preparing this high calcium rafifinal calcium alloy becomes a problem again.
Existing common reduction method is produced kalzium metal, be to be raw material with aluminum oxide and calcium oxide, make reductive agent with carbon, by the hot stove production in ore deposit, promptly allow to make the higher kalzium metal of calcium contents, because carbon content height (generally greater than 0.5%) in the alloy, use it for deoxidation after the vacuum-treat of high-grade auto sheet and tame electroplax ultra low-carbon steel, carbon content does not reach standard-required in the steel, so inapplicable.
Publication number is that the Chinese invention patent specification sheets of CN101260453 also discloses a kind of aluminium calcium briquetting that is used for deoxidation in steel making.This briquetting is a raw material with aluminium powder and calcium powder, is tackiness agent with paper pulp or water glass, is formed after mixing, repression.This aluminium calcium briquetting is not suitable for deoxidation after the vacuum-treat of producing above-mentioned ultra low-carbon steel yet.Its reason, the one, the briquetting adhesive therefor is made up of hydrocarbon polymer, and entering with briquetting not only increases carbon content in the steel, also increase hydrogen richness, and this is that high-grade automobile and household electrical appliances use steel institute unallowed; The 2nd, adhesive therefor all contains moisture, and aluminium powder and calcium powder are when mixing with tackiness agent, and most of calcium is oxidized to calcium oxide after meeting water very soon, and makes the content of calcium metal in the briquetting very low, does not have due effect; The 3rd, this aluminium calcium compounds is under the vacuum state of 1000 ℃ of high temperature, 2 holders, and calcium metal wherein can become evaporation of vapours very soon, and the system of being evacuated takes away, and can't enter in the steel.
Adopt general remelting process to prepare kalzium metal, as not adding any other technical measures,,, be difficult to make calcium contents and surpass 8% kalzium metal because calcium metal has characteristics noted earlier even be raw material with high purity metal aluminium and calcium metal.
Three, summary of the invention
The objective of the invention is to provide a kind of preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation at the problem that above-mentioned prior art exists, can prepare the high and high kalzium metal of purity of calcium contents with this method, to satisfy the technical requirements of adopting vacuum refinement production Ultra-low carbon, ultralow nitrogen, ultralow oxygen and ultralow-sulfur steel.
Another object of the present invention provides a kind of device that adopts this method to prepare aluminum-calcium alloy used for vacuum refining molten steel deoxidation.
The preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation provided by the invention may further comprise the steps:
(1) getting metallic aluminium and purity the calcium metal 99.8% or more of purity more than 99.5% is raw material, aluminium 70-90% by weight, calcium 10-30% batching;
(2) use Ajax-Wyatt furnace, under 900～1000 ℃ of temperature,, add calcium then rapidly, adopt argon shield simultaneously, alloy liquation and air are completely cut off the aluminium fusing;
(3) after melting 30-40 minute with alloy liquation casting ingot-forming in the stove, be broken into piece after the cooling, make kalzium metal.
Adopt the device of method for preparing aluminum-calcium alloy used for vacuum refining molten steel deoxidation, comprise Ajax-Wyatt furnace, on the top of Ajax-Wyatt furnace bell is arranged, the bell lower edge has the asbestos seal pad, and there is suspension hook the bell top, and bell is connected with argon bottle by pneumatic tube.
Preparing kalzium metal with above-mentioned method and apparatus, be raw material owing to adopt high purity metal aluminium and calcium metal, and no any other impurity is sneaked in whole smelting process, has guaranteed the high purity of alloy; After calcium adds; adopt protection of inert gas; it is not contacted with air; avoid oxidization burning loss, add the employing Ajax-Wyatt furnace, smelting temperature is low; liquation does not seethe; can make whole calcium even dispersion in metallic aluminium, form fine and close kalzium metal at last, for the content that improves calcium in the alloy has been created favourable condition.Molten steel after the vacuum-treat adds this kalzium metal, can make deoxidation and calcium handle a step and finish, and both can reduce the technological operation step, shortens the heat, and can make Al in the molten steel again
2O
3Deoxidation products content obviously reduces.Not only can solve nozzle clogging problem in the casting process, and the steel that make are when guaranteeing that O, C, N, S component content do not exceed standard-required, inclusion content is few, and steel product quality satisfies high-grade auto sheet and tame electroplax production requirement.
In addition and since this kalzium metal with understand on the surface very fast formation one deck alumina protective layer after air contact, alloy inside is not contacted and oxidation with air, in atmosphere, be difficult for the atomizing advantage so it also has, for transportation and preservation in the production are provided convenience.
Four, description of drawings
Accompanying drawing prepares the structural representation of the device of aluminum-calcium alloy used for vacuum refining molten steel deoxidation for the present invention.
Five, embodiment
With reference to accompanying drawing, the present invention prepares the device of aluminum-calcium alloy used for vacuum refining molten steel deoxidation, form by Ajax-Wyatt furnace 1 and the bell 4 that matches, the contacted lower edge of bell and induction furnace has asbestos seal pad 3, the top of bell is provided with suspension hook 5, and bell joins by pneumatic tube 6 and argon bottle 7.
Below for utilizing an embodiment of this device preparation aluminum-calcium alloy used for vacuum refining molten steel deoxidation, concrete steps are as follows:
(1) gets the aluminium of purity 99.9% and the calcium of purity 99.5% and do raw material;
(2) by suspension hook 5 bell 4 of Ajax-Wyatt furnace 1 is sling, use above-mentioned raw materials, aluminium 80% by weight, calcium 20% batching drops into aluminium in the stove earlier and melts, and treats that aluminium fusing back adds calcium rapidly, open argon bottle 7 simultaneously, and bell 4 put down, with the induction furnace sealing, make the alloy liquation 2 in the stove isolated by asbestos seal pad 3 with air;
(3) melting with alloy liquation casting ingot-forming in the stove, was closed argon gas after finishing cast after 35 minutes;
(4) cooled notes ingot is broken into piece, makes the kalzium metal that contains aluminium 80%, calcium 20% by weight.
Certain steel mill is used for this kalzium metal the vacuum refinement deoxidation of DC01 automobile slab, alloy is placed in the high hopper, by the disposable adding of vacuum hopper (alloy usage quantity according to steel in oxygen level determine), " calmness " poured into a mould after 10-20 minute behind the molten steel vacuum decarburization.With compare the statistical value of result of use such as following table with aluminium deoxidation:
By in the table as seen, vacuum refinement employing kalzium metal deoxidation of the present invention, O, C, N, S component content are all within the scope of standard-required in the steel; Inclusion content of steel reduces by 40%; Stove mouth of a river scale down obviously reduces before and after during cast, proves that the nozzle clogging phenomenon greatly alleviates, and the continuous casting furnace number increases simultaneously, has improved the STEELMAKING PRODUCTION rate.
Use through reality, fine quality with the automobile board of this billet rolling thickness 0.2-1.0mm, complete alternative import is used to produce high-grade automobile.
Claims (2)
1. the preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation is characterized in that may further comprise the steps:
(1) getting metallic aluminium and purity the calcium metal 99.8% or more of purity more than 99.5% is raw material, aluminium 70-90% by weight, calcium 10-30% batching;
(2) use Ajax-Wyatt furnace, under 900～1000 ℃ of temperature,, add calcium then rapidly, adopt argon shield simultaneously, alloy liquation and air are completely cut off the aluminium fusing;
(3) after melting 30-40 minute with alloy liquation casting ingot-forming in the stove, be broken into piece after the cooling, make kalzium metal.
2. the device for preparing aluminum-calcium alloy used for vacuum refining molten steel deoxidation according to the method for claim 1, comprise Ajax-Wyatt furnace (1), it is characterized in that, bell (4) is arranged on the top of this Ajax-Wyatt furnace, the bell lower edge has asbestos seal pad (3), there is suspension hook (5) the bell top, and bell is connected with argon bottle (7) by pneumatic tube (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125493 CN101787452A (en) | 2010-03-17 | 2010-03-17 | Preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010125493 CN101787452A (en) | 2010-03-17 | 2010-03-17 | Preparation method of aluminum-calcium alloy used for vacuum refining molten steel deoxidation and device thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350703A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Method for preparing aluminum-calcium alloy through thermal reduction of electrolytic raw aluminum liquid and molten salt |
| CN110016536A (en) * | 2019-05-09 | 2019-07-16 | 湛江申翰科技实业有限公司 | A kind of preparation method of high calloy |
| CN111850235A (en) * | 2020-07-08 | 2020-10-30 | 鞍钢股份有限公司 | Metal calcium particle aluminum calcium wire and preparation method thereof |
| CN112375872A (en) * | 2020-11-06 | 2021-02-19 | 郭鸿鼎 | Micro-carbon low-sulfur high-aluminum iron-free aluminum-calcium alloy deoxidizer and preparation method and application thereof |
| CN112501477A (en) * | 2020-11-06 | 2021-03-16 | 郭鸿鼎 | Micro-carbon low-sulfur high-aluminum iron-free aluminum-magnesium-calcium alloy deoxidizer and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54149310A (en) * | 1978-05-16 | 1979-11-22 | Ube Ind Ltd | Manufacture of calcium-aluminum alloy powder |
| CN101113485A (en) * | 2007-07-16 | 2008-01-30 | 郭庆成 | High-calcium non-silicon aluminium calcium magnesium ferrous alloy for steel-smelting deoxidization and method for preparing the same |
-
2010
- 2010-03-17 CN CN 201010125493 patent/CN101787452A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54149310A (en) * | 1978-05-16 | 1979-11-22 | Ube Ind Ltd | Manufacture of calcium-aluminum alloy powder |
| CN101113485A (en) * | 2007-07-16 | 2008-01-30 | 郭庆成 | High-calcium non-silicon aluminium calcium magnesium ferrous alloy for steel-smelting deoxidization and method for preparing the same |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350703A (en) * | 2015-07-16 | 2017-01-25 | 东北大学 | Method for preparing aluminum-calcium alloy through thermal reduction of electrolytic raw aluminum liquid and molten salt |
| CN106350703B (en) * | 2015-07-16 | 2018-07-10 | 东北大学 | A kind of method for preparing kalzium metal with electrolysis raw aluminum liquid fused salt thermal reduction |
| CN110016536A (en) * | 2019-05-09 | 2019-07-16 | 湛江申翰科技实业有限公司 | A kind of preparation method of high calloy |
| CN111850235A (en) * | 2020-07-08 | 2020-10-30 | 鞍钢股份有限公司 | Metal calcium particle aluminum calcium wire and preparation method thereof |
| CN112375872A (en) * | 2020-11-06 | 2021-02-19 | 郭鸿鼎 | Micro-carbon low-sulfur high-aluminum iron-free aluminum-calcium alloy deoxidizer and preparation method and application thereof |
| CN112501477A (en) * | 2020-11-06 | 2021-03-16 | 郭鸿鼎 | Micro-carbon low-sulfur high-aluminum iron-free aluminum-magnesium-calcium alloy deoxidizer and preparation method and application thereof |
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Open date: 20100728 |