CN109423535A - A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization - Google Patents
A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization Download PDFInfo
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- CN109423535A CN109423535A CN201710756643.2A CN201710756643A CN109423535A CN 109423535 A CN109423535 A CN 109423535A CN 201710756643 A CN201710756643 A CN 201710756643A CN 109423535 A CN109423535 A CN 109423535A
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- desulfurization
- slag
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- vacuum induction
- technology
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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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization, desulfurization pretreatment: it is melting down rear by prolonged high temperature refinery charging, utilize good reaction between carbon and oxygen to realize the removing of O, N；Alloy element is added after refining；Compound desulfurization: the quick slag making of CaO-Al2O3-CaF2 system pre-melted slag is added to the weld pool surface after desulfurization pretreatment；The agent of NiCa deep desulphurization is added after added pre-melted slag is changed clearly substantially and carries out precipitating desulfurization, and the amount of allocating of Ca is 0.01wt%-0.03wt%.The present invention mainly propose after alloying by the quick slag making of CaO-Al2O3-CaF2 system pre-melted slag and add NiCa alloy carry out compound desulfurization in the way of come the purpose for the alloy vacuum induction depth desulfurization that reaches a high temperature, when can be made by this means using non-selected raw material, the control of vacuum induction melting S content is in 5ppm or less.
Description
Technical field
The present invention relates to vacuum metallurgy technology fields, and in particular to a kind of process for vacuum induction smelting.
Background technique
Process for vacuum induction smelting is to generate vortex using electromagnetic induction under conditions of high vacuum to melting materialss
A kind of special type metallurgical smelting means.Due to being the fusion process carried out under the conditions of condition of high vacuum degree, the effect of O, de- N are taken off
Compared with other, melting means are more superior under air, while it is also more accurate for the control of ladle chemistry.Due to
The special construction of vaccum sensitive stove is currently used primarily in the melting of high-alloy steel and high temperature alloy etc..
For high temperature alloy, sulphur is capable of forming Low melting point eutectic, and liquid film is easily formed in crystallization process, thus
It reduces the plasticity of material and alloy is difficult to.Therefore sulphur is harmful element fatal in high temperature alloy, main at present logical
Cross the S content in control raw material and the removing in melting later period addition metal desulfurization agent (Ca, Mg) Lai Jinhang S.And S is selected to contain
Measuring lower fine fodder undoubtedly will increase smelting cost, and simple addition metal desulfurization agent has desulfurization effect difference and desulfurization product again
The problem of residual.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is to provide it is a kind of for high-temperature alloy vacuum induction melting process into
The technological means of row depth desulfurization.Spreading desulfurization by slag making after VIM process alloying combines addition metal desulfurization agent to precipitate desulfurization
Compound action can make under the conditions of non-selected raw material, vacuum induction melting S content control in 5ppm or less.To meet
The high temperature alloy requirement more and more harsh for S content.
The technical scheme is that a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization,
A, desulfurization pretreatment: it is melting down rear by prolonged high temperature refinery charging, utilize good reaction between carbon and oxygen to realize
O, the removing of N；Alloy element is added after refining；
B, compound desulfurization: CaO-Al is added to the weld pool surface after desulfurization pretreatment2O3-CaF2It is that pre-melted slag is quick
Slag making, the slag system include following chemical constituent:
CaO:40~50wt%, Al2O3: 16~25wt%, CaF2: 13-20wt%, MgO:3-5wt%, SiO2: 1-
4wt%, Li2O:2-7wt%, BaO:3-6wt%；
C, the agent of NiCa deep desulphurization is added after added pre-melted slag is changed clearly substantially carry out precipitating desulfurization, the amount of allocating of Ca
For 0.01wt%-0.03wt%.
The amount of allocating of Ca refers to the amount of allocating for accounting for molten steel.
1, desulfurization pretreatment
This step is the necessary stage before compound desulfurization, i.e., is utilized after charging is melting down by prolonged high temperature refinery
Good reaction between carbon and oxygen realizes the removing of O, N.The alloy elements such as Al, Ti are added after refining, Al, Ti is added not only at this time
O can be further taken off, also makes molten bath be in higher temperature using chemical heat simultaneously, this is all that subsequent compound desulfurization is created
Highly beneficial thermodynamic condition.
2, compound desulfurization
Molten bath is in the state of high temperature, low O after desulfurization pretreatment.CaO-Al is added to weld pool surface2O3-CaF2System
The quick slag making of pre-melted slag, the slag system include following chemical constituent:
CaO:40~50wt%, Al2O3: 16~25wt%, CaF2: 13-20wt%, MgO:3-5wt%, SiO2: 1-
4wt%, Li2O:2-7wt%, BaO:3-6wt%.
CaO-Al2O3、CaF2: with CaO-Al2O3Be pre-melted slag be base be added CaF2As fluxing agent, not only solve simple
CaO hygroscopic problem also makes slag system fusing point is lower being capable of rapid slagging.CaO be the key that risen in slag charge desulfidation at
Point, desulfurization effect then causes slag system fusing point is higher to be not easy slagging not enough, when being higher than 50wt% when lower than 40wt%.CaF2As
Flux constituents reduce slag system fusing point in slag system, mobility improves so that the dynamic conditions of slag system desulfurization is preferable,
The effect of rapid slagging is not achieved when lower than 13wt%, higher than 20wt% when can then reduce slag system basicity influence desulfurization effect.
MgO: and in order to mitigate erosion of the slag to crucible refractory material, certain MgO constituent element is also incorporated in slag, it can
To play the role of protecting crucible refractory material, and the metallurgical function of slag is not influenced.For magnesia furnace lining when lower than 3wt%
Protective effect is inadequate, then will affect the desulfurization effect of slag system when greater than 5wt%.
SiO2: a small amount of SiO is incorporated in slag2Slag system fusing point can be reduced, while the denaturation of brittle inclusion can be promoted.But
It is the biography oxygen that will lead to after too high levels to slag bath, therefore should controls in 1-4wt%.
Li2O: Li is incorporated in slag2O can form low melting point mutually to which slag system fusing point be greatly reduced, and also have simultaneously preferable
Desulfidation.Desulfurization effect is inadequate when lower than 2wt%, and promotion when higher than 7wt% for desulfurization effect is limited and can improve
Slag system cost.
BaO:BaO belongs to strong basicity oxide, very crucial for the desulfurization of slag system.Desulfurization effect is not when lower than 3wt%
Enough, but when being higher than 6wt% content is further increased to be promoted limited for desulfurization effect and will increase slag system cost.
Ca amount of allocating does not have the effect of deep desulfurization when being less than 0.01wt%, but then will lead to when being greater than 0.03wt% molten
The residual higher problem of Ca in liquid.Unlatching electromagnetic agitation makes melt ingredient uniformly and promotes desulfurization product after metal desulfurization agent is added
Floating.The desulfurization product CaS of formation is floated more easily by the fixed purpose to be finally reached deep desulfurization of slag blanket absorption.
A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to the present invention, it is preferred that the pre-melted slag
Add the quantity of slag in 6-11kg/t.Desulfurization effect is unobvious when pre-melted slag additive amount is very little, and it is too many when there are sluggings slow, molten bath temperature
Serious problem is dropped, therefore controls and adds the quantity of slag in 6-11kg/t.The quantity of slag for adding the quantity of slag to refer to that 1t molten steel to be added.
A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to the present invention, it is preferred that the pre-melted slag
Slag system granularmetric composition is 2-20mm.Slag system granularity: the granularity of pre-melted slag is also to guarantee rapid slagging and good reaction is dynamic
The key factor of mechanics, the too big then reactivity worth of particle size is poor, and slagging is slow, and the uniformity of slagging is poor；Particle is too small, is easy
It causes to disperse and fugitive dust.
Further, the pre-melted slag slag system granularmetric composition is 5-15mm.
The technology of a kind of high-temperature alloy vacuum induction melting depth desulfurization according to the present invention, it is preferred that in step c, add
Unlatching electromagnetic agitation makes melt ingredient uniformly and promotes the floating of desulfurization product after entering metal desulfurization agent.
The advantage of the present invention compared with prior art is the technique for taking slag making to add the compound desulfurization of metal desulfurization agent, so that
Desulfurization effect is more excellent, and also solves the short critical defect of CaO material crucible life.
Compared with prior art, the main characteristic of the invention lies in that providing a kind of cost-effective desulfurization technology to realize
The super-low sulfur requirement of high temperature alloy.Utilize CaO-Al2O3-CaF2It is that fritting basicity of slag is high, slagging is fast and the metallurgy of good fluidity
Feature can sufficiently be diffused desulfurization, while the addition of MgO is also beneficial to the protection of crucible furnace lining.In conjunction with adding for NiCa alloy
Enter further to precipitate desulfurization, and desulfurization product CaS enters in slag system to be fixed absorption and solve and remains desulfurization in molten steel
The defect of product.The deep desulfurization requirement of high-temperature alloy vacuum induction melting may be implemented with the method for such compound desulfurization.
Specific embodiment
Test confirms that the depth that high-temperature alloy vacuum induction melting may be implemented in the compound desulfurization technology that the present invention develops is de-
Sulphur.The pre-melted slag combination NiCa alloy that four kinds of compositions are respectively adopted carries out desulfurization test, and composition, using effect are as shown in table 1.
Certain high temperature alloy of melting is tested, smelting furnace is 8t vaccum sensitive stove, and smelting technology is charging-melting stage-preceding essence
The refining phase-alloying phase-casting of rear refining period-.Detailed process is as follows:
1, according to component requirements, the alloys such as major ingredients and Al, Ti such as Ni plate, metal Cr, metal Fe alloy raw material: are selected
Material and desulfurizing agent include pre-melted slag (its chemical composition is shown in Table 1) and NiCa alloy: Ca 5wt%, Ni 95wt%.
2, alloy charges: the main materials such as C, Ni, Cr, Fe, Co are first added when feeding for vacuum induction, when disposably plus endless
It can carry out being added with furnace.
3, melting stage: start small-power power transmission after closing furnace, when vacuum degree is lower with high-power rapid material to melting down.
4, preceding refining period: after alloy major ingredientization is clear, temperature is controlled in 1520 DEG C, soaking time 30min.
5, the alloying phase: have a power failure conjunctiva before addition Al, Ti, and Al, Ti are added with block material, and temperature is adjusted after melting down to 1530
DEG C and constant temperature keep.
6, rear refining period: this stage rapidly joins previously baked good stand-by pre-melted slag, and increased wattage makes its rapid slagging,
Electromagnetic agitation 3min is opened after slag chargeization is clear, while controlling temperature at 1530 DEG C.NiCa alloy is added and carries out precipitating desulfurization, then
Secondary unlatching electromagnetic agitation 3min.Power is dropped after stirring to be kept the temperature, and chemical composition analysis and adjustment are carried out during heat preservation.
7, it is poured: after chemical component is up to standard, adjusting to 1480 DEG C of pouring temperature and carry out electrification tapping.By earthenware after pouring
Residue pours into tundish in crucible, if not needing shovel Slag treatment also completely.
The content of embodiment 1-4 see the table below.
The implementation result of the invention of table 1
The present invention utilizes CaO-Al after proposing alloying2O3-CaF2It is the quick slag making of pre-melted slag and adds the progress of NiCa alloy
The mode of compound desulfurization can make to use non-selected raw material by this means come the purpose for the alloy vacuum induction depth desulfurization that reaches a high temperature
When, vacuum induction melting S content control in 5ppm or less.
Claims (5)
1. a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization, it is characterised in that:
A, desulfurization pretreatment: it is melting down rear by prolonged high temperature refinery charging, utilize good reaction between carbon and oxygen to realize O, N
Removing；Alloy element is added after refining；
B, compound desulfurization: CaO-Al is added to the weld pool surface after desulfurization pretreatment2O3-CaF2It is the quick slag making of pre-melted slag,
The slag system includes following chemical constituent:
CaO:40~50wt%, Al2O3: 16~25wt%, CaF2: 13-20wt%, MgO:3-5wt%, SiO2: 1-4wt%,
Li2O:2-7wt%, BaO:3-6wt%；
C, the agent of NiCa deep desulphurization being added after added pre-melted slag is changed clearly substantially and carrying out precipitating desulfurization, the amount of allocating of Ca is
0.01wt%-0.03wt%.
2. a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to claim 1, it is characterised in that: described
Pre-melted slag adds the quantity of slag in 6-11kg/t.
3. a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to claim 1, it is characterised in that: described
Pre-melted slag slag system granularmetric composition is 2-20mm.
4. a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to claim 3, it is characterised in that: described
Pre-melted slag slag system granularmetric composition is 5-15mm.
5. a kind of technology of high-temperature alloy vacuum induction melting depth desulfurization according to claim 1, it is characterised in that: step
In c, unlatching electromagnetic agitation makes melt ingredient uniformly and promotes the floating of desulfurization product after metal desulfurization agent is added.
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| CN201710756643.2A CN109423535A (en) | 2017-08-29 | 2017-08-29 | A kind of technology of high-temperature alloy vacuum induction melting depth desulfurization |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534713A (en) * | 2020-07-07 | 2020-08-14 | 北京钢研高纳科技股份有限公司 | Purification treatment method of cast high-temperature alloy return material and high-temperature alloy |
| CN114317891A (en) * | 2022-01-05 | 2022-04-12 | 任超群 | Vacuum induction melting desulfurization process for alloy steel |
| CN115323117A (en) * | 2022-07-28 | 2022-11-11 | 中国科学院金属研究所 | Smelting method for deep desulfurization of high-temperature alloy |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4624707A (en) * | 1985-10-11 | 1986-11-25 | Bethlehem Steel Corporation | Continuous casting slag |
| CN1360071A (en) * | 2000-12-21 | 2002-07-24 | 中国科学院金属研究所 | High-temp vacuum induction smelting and desulfurizing technology for preparing super-purity alloy |
| CN101134987A (en) * | 2006-08-30 | 2008-03-05 | 宝山钢铁股份有限公司 | Desulfurizing agent for non-oriented silicon steel |
| CN101545027A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Low-carbon quick melting ladle refining slag |
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
| CN102776378A (en) * | 2012-07-30 | 2012-11-14 | 攀钢集团江油长城特殊钢有限公司 | Desulfurization method of high temperature alloy smelted by vacuum induction furnace |
-
2017
- 2017-08-29 CN CN201710756643.2A patent/CN109423535A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4624707A (en) * | 1985-10-11 | 1986-11-25 | Bethlehem Steel Corporation | Continuous casting slag |
| CN1360071A (en) * | 2000-12-21 | 2002-07-24 | 中国科学院金属研究所 | High-temp vacuum induction smelting and desulfurizing technology for preparing super-purity alloy |
| CN101134987A (en) * | 2006-08-30 | 2008-03-05 | 宝山钢铁股份有限公司 | Desulfurizing agent for non-oriented silicon steel |
| CN101545027A (en) * | 2008-03-24 | 2009-09-30 | 宝山钢铁股份有限公司 | Low-carbon quick melting ladle refining slag |
| CN101760585A (en) * | 2010-02-03 | 2010-06-30 | 衡阳华菱连轧管有限公司 | Deep-desulphurizing slag system containing BaO and Li2O and method for producing ultralow-sulfur steel by adopting same |
| CN102776378A (en) * | 2012-07-30 | 2012-11-14 | 攀钢集团江油长城特殊钢有限公司 | Desulfurization method of high temperature alloy smelted by vacuum induction furnace |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534713A (en) * | 2020-07-07 | 2020-08-14 | 北京钢研高纳科技股份有限公司 | Purification treatment method of cast high-temperature alloy return material and high-temperature alloy |
| CN111534713B (en) * | 2020-07-07 | 2020-10-16 | 北京钢研高纳科技股份有限公司 | Purification treatment method of cast high-temperature alloy return material and high-temperature alloy |
| CN114317891A (en) * | 2022-01-05 | 2022-04-12 | 任超群 | Vacuum induction melting desulfurization process for alloy steel |
| CN115323117A (en) * | 2022-07-28 | 2022-11-11 | 中国科学院金属研究所 | Smelting method for deep desulfurization of high-temperature alloy |
| CN115323117B (en) * | 2022-07-28 | 2024-01-19 | 中国科学院金属研究所 | Smelting method for deep desulfurization of high-temperature alloy |
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Effective date of registration: 20200521 Address after: 200940 room 1277, building 216, 1269 Shuishui Road, Baoshan District, Shanghai Applicant after: Baowu Special Metallurgy Co., Ltd Address before: 200940 No. 1269, Fisheries Road, Shanghai, Baoshan District Applicant before: BAOSTEEL SPECIAL STEEL Co.,Ltd. |
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Application publication date: 20190305 |