CN105132702A - Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel - Google Patents
Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel Download PDFInfo
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- CN105132702A CN105132702A CN201510566969.XA CN201510566969A CN105132702A CN 105132702 A CN105132702 A CN 105132702A CN 201510566969 A CN201510566969 A CN 201510566969A CN 105132702 A CN105132702 A CN 105132702A
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- China
- Prior art keywords
- slag
- aluminum
- electroslag
- aluminium
- steel
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Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 71
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000010309 melting process Methods 0.000 title abstract 4
- 239000002893 slag Substances 0.000 claims abstract description 41
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 6
- 239000004411 aluminium Substances 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 238000005204 segregation Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to an electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel. The electroslag re-melting process is characterized in that a binary slag system is adopted, wherein parts of CaF2 and Al2O3 are replaced by returned slag of the same steel type. During slag melting, aluminum powder which accounts for 2%-4% of the slag is added to remove unstable oxides in the slag. Aluminum burning loss is severe because of large current fluctuation in first two hours of a re-melting initial stage, the aluminum powder is added to regulate aluminum in electrode blank until the aluminum amount exceeds upper limit of a range by 0.1%, and then, aluminum powder is added according to component upper limit for deoxidation. A melting rate (kg/h) during the electroslag re-melting process is equal to (0.75-0.85)*an average diameter (mm) of a crystallizer, so that surface smooth of an electroslag ingot can be guaranteed, and surfaces pits and insufficient steel-slag separation are avoided.
Description
Technical field
The invention belongs to electroslag metallurgy technical field, particularly a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity.
Background technology
Electroslag remelting technique is as a kind of means of smelting high-quality steel ingot, and the metallurgical reaction condition excellent with it and special crystallization mode have the irreplaceable superiority of other method for making steel.But esr process is generally carry out under air, and the oxidizing atmosphere in electroslag remelting furnace is very high, be easy to the oxidizable element generation scaling loss made in steel, composition is difficult to control, and easily causes segregation.
Its aluminium component scope of the high-aluminum steels such as 38CrMoAl, NAK80 is 0.70% ~ 1.10%, and because it is in esr process, owing to containing a large amount of oxidizing atmosphere in stove, the aluminium element in steel is easy to can by high temperature oxidation scaling loss, general scaling loss 0.2 ~ 0.3% during electroslag.The large aluminium scaling loss of remelting initial stage fluctuation of current seriously can reach 0.3 ~ 0.5%, and composition segregation is serious, affects the mechanical property of product.Current most domestic producer is the aluminium element segregation controlling high-aluminum steel, generally only adopts sealed argon shield, reduce electroslag furnace internal oxidition atmosphere, but effect is not very desirable, and the aluminium component difference at ESR ingot two ends is very large, and component segregation is serious.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency of the prior art and a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity is provided.
Technical scheme of the present invention is achieved in that a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity, it is characterized in that: select binary slag system during esr, adopts used same steel grade to return slag and replaces a certain proportion of CaF
2and Al
2o
3, its concrete per-cent is CaF
2: 50 ~ 60%, Al
2o
3: 20 ~ 30%, return slag 10 ~ 30% with steel grade; It is dry that first slag charge carries out baking before remelting.
Return slag with steel grade to reuse number of times and be no more than 2 times.Aluminum steel returns original unstable oxide in slag and reacts with the aluminium element in steel, and the oxygen in slag is by the aluminium reducing in molten steel, and oxide content is little, again re-uses the oxidation that can reduce aluminium in molten steel, reduces the segregation of aluminium element.
Carry out under dry argon gas protection during esr.
2% ~ 4% aluminium powder adding the quantity of slag during esr frontization slag removes the unstable oxide in slag charge.
The esr initial stage, fluctuation of current is large, aluminium scaling loss is large, add aluminium powder during esr in first two hours aluminium content in electrode billet to be adjusted to exceed 0.10% of the composition range upper limit, remelting added the upper limit that aluminium content is adjusted to composition range by aluminium powder after two hours, and reflow process takes automatic charging equipment to add aluminium powder deoxidation.
Melting rate (kg/h) during esr=(0.75 ~ 0.85) × crystallizer mean diameter (mm), can ensure ESR ingot smooth surface, and pockmark and slag are regardless of phenomenon to avoid surface to occur.
The positively effect that technical scheme of the present invention produces is as follows: the same steel grade that described remelting slag system contains 10 ~ 30% returns slag, and cost is lower than common binary remelting slag system, reduces electroslag production cost.
Described 2% ~ 4% aluminium powder adding the quantity of slag when changing slag before esr can remove the unstable oxide in slag charge, forms stable Al
2o
3, avoid the oxygen in slag to enter into molten steel and make ESR ingot oxygenation.
Described Aluminum steel returns slag and reacts with the aluminium element in steel, return oxygen in slag by the aluminium reducing in molten steel, oxide content is little, again re-uses the oxidation that can reduce aluminium in molten steel, reduce the scaling loss of aluminium element, reduce the segregation of aluminium element.
Embodiment
Control an electroslag remelting process for high-aluminum steel aluminium element homogeneity, select NAK80 steel grade, ingot shape specification: 5 tons; Slag system: 56%CaF
2+ 24%Al
2o
3+ 20% returns slag (returning slag with steel grade to reuse number of times and be no more than 2 times) with steel grade; The quantity of slag: 170kg.Slag charge removes moisture in 4 hours 600 DEG C of bakings before change slag.Consumable electrode is Φ 500mm die casting base, and electroslag melting rate average control is at 520 ~ 560kg/h.Add aluminium powder during remelting as reductor, according to the aluminium content of electrode billet, remelting adds aluminium powder 80g/5 minute in first two hours, and add 35 grams/5 minutes afterwards, reflow process takes automatic charging equipment deoxidation.Observe ESR ingot surface quality after carrying mould good, surface is without pockmark, slag runner.Carry out under dry argon gas protection during esr.
Melting rate (kg/h) during esr=(0.75 ~ 0.85) × crystallizer mean diameter (mm).
NAK80 finished product two ends aluminium element analytical results is in table 1.
Table 1NAK80 finished product two ends aluminium element analytical results
As seen from the above table: adopt the esr molten steel in the present embodiment to carry out electroslag, greatly can reduce the scaling loss of aluminium element in esr process, reduce the segregation degree of aluminium element.
Claims (6)
1. control an electroslag remelting process for high-aluminum steel aluminium element homogeneity, it is characterized in that: during esr, select binary slag system, adopt used same steel grade to return slag and replace a certain proportion of CaF
2and Al
2o
3, its concrete per-cent is CaF
2: 50 ~ 60%, Al
2o
3: 20 ~ 30%, return slag 10 ~ 30% with steel grade; It is dry that first slag charge carries out baking before remelting.
2. a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity according to claim 1, is characterized in that: return slag with steel grade and reuse number of times and be no more than 2 times.
3. a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity according to claim 1, is characterized in that: carry out under dry argon gas protection during esr.
4. a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity according to claim 1, is characterized in that: 2% ~ 4% aluminium powder adding the quantity of slag during esr frontization slag removes the unstable oxide in slag charge.
5. a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity according to claim 1, it is characterized in that: add aluminium powder during esr in first two hours and aluminium content in electrode billet is adjusted to exceed 0.10% of the composition range upper limit, remelting added the upper limit that aluminium content is adjusted to composition range by aluminium powder after two hours, and reflow process takes automatic charging equipment to add aluminium powder deoxidation.
6. a kind of electroslag remelting process controlling high-aluminum steel aluminium element homogeneity according to claim 1, is characterized in that: melting rate (kg/h)=(0.75 ~ 0.85) × crystallizer mean diameter (mm) during esr.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566969.XA CN105132702A (en) | 2015-09-09 | 2015-09-09 | Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510566969.XA CN105132702A (en) | 2015-09-09 | 2015-09-09 | Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel |
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| CN105132702A true CN105132702A (en) | 2015-12-09 |
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|---|---|---|---|
| CN201510566969.XA Pending CN105132702A (en) | 2015-09-09 | 2015-09-09 | Electroslag re-melting process for controlling aluminum uniformity of high-aluminum steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950880A (en) * | 2016-05-27 | 2016-09-21 | 中原特钢股份有限公司 | Sulfur bearing steel electro-slag remelting process |
| CN114231750A (en) * | 2021-11-23 | 2022-03-25 | 河钢股份有限公司 | Ti and Al control method for electroslag remelting of nickel-based gas valve alloy steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6336965A (en) * | 1986-07-30 | 1988-02-17 | Daido Steel Co Ltd | Electro-slag remelting method |
| CN101914687A (en) * | 2010-08-31 | 2010-12-15 | 攀钢集团钢铁钒钛股份有限公司 | Electroslag remelting method of steel for aluminum controlled seamless steel pipe |
| CN103468965A (en) * | 2013-09-25 | 2013-12-25 | 安徽工业大学 | Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof |
| CN104561570A (en) * | 2013-09-25 | 2015-04-29 | 安徽工业大学 | Using method of electroslag remelting refining slag by efficiently using returned slag |
-
2015
- 2015-09-09 CN CN201510566969.XA patent/CN105132702A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6336965A (en) * | 1986-07-30 | 1988-02-17 | Daido Steel Co Ltd | Electro-slag remelting method |
| CN101914687A (en) * | 2010-08-31 | 2010-12-15 | 攀钢集团钢铁钒钛股份有限公司 | Electroslag remelting method of steel for aluminum controlled seamless steel pipe |
| CN103468965A (en) * | 2013-09-25 | 2013-12-25 | 安徽工业大学 | Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof |
| CN104561570A (en) * | 2013-09-25 | 2015-04-29 | 安徽工业大学 | Using method of electroslag remelting refining slag by efficiently using returned slag |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105950880A (en) * | 2016-05-27 | 2016-09-21 | 中原特钢股份有限公司 | Sulfur bearing steel electro-slag remelting process |
| CN114231750A (en) * | 2021-11-23 | 2022-03-25 | 河钢股份有限公司 | Ti and Al control method for electroslag remelting of nickel-based gas valve alloy steel |
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Application publication date: 20151209 |
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