CN101302582B - Copper electroslag remelting process - Google Patents
Copper electroslag remelting process Download PDFInfo
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- CN101302582B CN101302582B CN2008101404897A CN200810140489A CN101302582B CN 101302582 B CN101302582 B CN 101302582B CN 2008101404897 A CN2008101404897 A CN 2008101404897A CN 200810140489 A CN200810140489 A CN 200810140489A CN 101302582 B CN101302582 B CN 101302582B
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- copper
- remelting
- electroslag
- electroslag remelting
- stripping
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Abstract
The invention belongs to the metallic copper production field and in particular relates to a copper electroslag resmelting process. The resmelting process adopts a slag system consisting of the following compositions in percentage by weight: 55 to 65 percent of CaF2, 15 to 25 percent of MgF2 or NaF and 15 to 25 percent of BaCl2; and slag materials are fully dried before resmelting. Copper producedby adopting the resmelting process has good thermal processing performance; at the same time, a plurality of small copper ingots are utilized to produce a large copper ingot, thereby meeting the needof equipment manufacturing.
Description
(1) technical field
The invention belongs to the production field of metallic copper, particularly a kind of copper electroslag remelting process.
(2) background technology
Copper has favorable conductive, heat conduction, processing performance such as corrosion-resistant, is widely used in fields such as machinery, shipbuilding.But impurity in ordinary copper ingot casting or the copper continuous casting base and thick, loose as-cast structure often cause copper to ftracture in hot procedure, have caused copper hot-work volume recovery to reduce; In addition, some mechanical component need big copper ingot to make, and when required copper ingot exceeds the capacity of crucible of copper smelting, will cause the difficulty of smelting.Therefore how to improve the copper purity, improve its as-cast structure, improve its high-temp plastic to improve copper hot-work volume recovery and just to have become current copper manufacture field urgent problem with the big copper ingot of little copper ingot production.
(3) summary of the invention
The object of the present invention is to provide a kind of remelting processing of copper electroslag, copper high purity, the as-cast structure of preparing is good, high-temp plastic is strong, has solved the low problem of copper hot-work volume recovery.
The present invention simultaneously also further provides and can adopt little copper ingot to produce the method for big copper ingot.
The technical solution used in the present invention is as follows:
A kind of copper electroslag remelting process, the slag system that adopts following weight percent to form: CaF
255-65%, MgF
2Or NaF 15-25%, BaCl
215-25%, slag charge is thorough drying before remelting.
Esr requires the slag system fusing point lower 100-200 ℃ than alloy melting point, and the fusing point of copper is lower, about 1080 ℃, should adopt the slag system of fusing point between 900-1000 ℃ during copper electroslag remelting.Choose slag system provided by the invention, can realize the different impurities in the copper base metal is carried out selectively controlled refining.
Slag charge adopts baking dry in remelting as last, also can reduce moisture content in the slag with remelting with slag charge fritting postcooling, increases hydrogen, oxygenation to reduce in the copper electroslag remelting process, prevents that pore from appearring in the copper ingot bottom.
Preferably, remelting is carried out under nitrogen protection, can reduce the water capacity in the furnace gas greatly, makes hydrogeneous in the product, oxygen amount reduce to minimum.Because drying nitrogen is the oxygen generating station byproduct, utilize drying nitrogen protection remelting only need increase by a compressor and get final product, the esr cost is minimized.
In esr process, oxygen in the atmosphere can be transferred in the metal pool by slag bath from atmosphere, the copper consumable electrode is subjected to thermooxidizing when adding the oxygen level of copper consumable electrode itself and esr, and cupric oxide can shift in the slag input, and these factors all can increase the oxygen level in the ESR ingot.For reducing oxygenation in the esr process, can in reflow process, add reductor.Selecting the requirement of reductor is the severity that should be taken into account that this element of metal pair requires, the present invention selects for use metallic aluminium, metal RE, ferrozirconium, carbon dust, calcium carbide or copper-magnesium alloy as reductor, add-on is a 0.3-1.5Kg/ ton copper electroslag, in reflow process, adopt machinery to add or manually be interrupted the adding mode continuously, add and be advisable with 5-15 minute/time; Also the deoxidation metal can be processed into Φ 5-20mm wire rod, hang on the crystallizer wall and together melt deoxidation with the electrode base.If the consumable electrode deoxidation is good, killing not in the reflow process can be stained with slag and observe the slag look in esr process, if the slag look not white, can continue the deoxidation of adding reductor when remelting; If the slag look be white, killing not in the reflow process.
The proportion of copper is 8900kg/m
3Weigh 13% than steel, thermal conductivity is 0.089cal/cms ℃, be three to five times of steel, therefore melting rate is bigger than steel during electroslag copper, controls melting rate (Kg/ hour)=(1.0-1.5) * crystallizer diameter (mm) in the concrete esr process, can guarantee copper ESR ingot smooth surface, avoid copper ESR ingot surface to form numerous pockmarks, copper ashes occurs and be regardless of phenomenon.ESR ingot is a coagulation forming in the parcel of one deck slag crust, and slag crust has good heat insulating function, reduced the cooling intensity of ESR ingot.If to extracting part blowing, atomized water spray or water spray cooling out, can further improve density, the crystal grain thinning of copper ESR ingot during stripping remelting copper.Control melting rate (Kg/ hour)=(1.5-3.0) * crystallizer diameter (mm) in such cases, to guarantee the ESR ingot any surface finish.Stripping crystallizer design height is 1.2-2 a times of crystallizer diameter, and tapering (difference of port radius and last port radius is to the ratio of crystallizer height under the crystallizer) is controlled between the 0.2-2%.Tapering is too small, and the ESR ingot surface is prone to skull patch, needs grinding process before forging, and increases the later stage work amount; Tapering is excessive, and leakiness slag during stripping causes reflow process normally not carry out.Stripping can be taked continuous stripping or interrupted stripping, and interrupted stripping gained ESR ingot surface better.
Further, can take the alternately method of remelting during esr, go out bigger copper ingot to satisfy the requirement of device fabrication with less copper ingot remelting.
The present invention has following advantage with respect to prior art:
The copper hot workability of utilizing remelting processing of the present invention to produce is good, can utilize many little copper ingots to produce a big copper ingot simultaneously, satisfies the requirement of device fabrication.
(4) embodiment:
Below with specific embodiment technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto:
Consumable electrode vacuum furnace is the copper ingot forging with the inner barrel of crystallizer, and the weight of some inner barrel reaches the 6-7 ton, needs the copper ingot forging more than 8 tons.It is consumable electrode that following examples promptly adopt the continuously cast bloom of two Φ 590mm, about 4.2 tons of every weight, 8 tons the ESR ingot of a Φ 820mm of remelting preparation.
Embodiment 1-7
Select the slag system of each embodiment correspondence in the table 1 respectively for use.Because MgF
2And BaCl
2In all contain crystal water, so before the esr earlier under 400 ℃ of temperature baking removed moisture in 20 hours.Melting rate and corresponding crystallizer diameter see Table 1 respectively during esr copper; Hang the aluminum strip deoxidation on crystallizer wall, adding the aluminium amount is 0.5kg/ ton seasoning metal, and the oxygen level variation sees Table 2 in the copper of esr front and back, organizes changing conditions to see Table 3.
Table 1
Oxygen level changes before and after table 2 esr
| Continuously cast bloom [0] | Use aluminium deoxidation gained ESR ingot [0] during remelting |
| 60-70ppm | 70-80ppm |
Organize changing conditions before and after the table 3 copper continuous casting base esr
| Product | Crystal structure | Oxygen level | Sulphur content | Inclusion | Forgeability |
| Continuously cast bloom | The top layer is a column crystal, and the center has 1/2 to be equiax crystal | Low | High | Inclusion has concentration phenomenon | Difference, easy to crack |
| ESR ingot | It all is column crystal | High slightly | Low | The tiny dispersion of inclusion | Good, easily forge |
Claims (7)
1. a copper electroslag remelting process is characterized in that, the slag system that adopts following weight percent to form: CaF
255-65%, MgF
215-25%, BaCl
215-25%; Slag charge is thorough drying before remelting.
2. copper electroslag remelting process as claimed in claim 1 is characterized in that remelting is carried out under nitrogen protection.
3. copper electroslag remelting process as claimed in claim 1 or 2, it is characterized in that, continuously or be interrupted and add metallic aluminium, metal RE, ferrozirconium, carbon dust, calcium carbide or copper-magnesium alloy as reductor, add-on is a 0.3-1.5Kg/ ton copper electroslag in the esr process.
4. copper electroslag remelting process as claimed in claim 3 is characterized in that, control remelting melting rate (Kg/ hour)=(1.0-1.5) * crystallizer diameter (mm).
5. copper electroslag remelting process as claimed in claim 3 is characterized in that, stripping production ESR ingot in the reflow process, and the blowing of extraction part, atomized water spray or water spray are carried out secondary cool off; Control remelting melting rate (Kg/ hour)=(1.5-3.0) * crystallizer diameter (mm) in the reflow process.
6. copper electroslag remelting process as claimed in claim 5 is characterized in that, the design height of stripping crystallizer is 1.2-2 a times of crystallizer diameter, and tapering is 0.2-2%.
7. as claim 5 or 6 described copper electroslag remelting process, it is characterized in that interrupted stripping mode is taked in stripping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101404897A CN101302582B (en) | 2008-07-04 | 2008-07-04 | Copper electroslag remelting process |
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| CN2008101404897A CN101302582B (en) | 2008-07-04 | 2008-07-04 | Copper electroslag remelting process |
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| CN101302582A CN101302582A (en) | 2008-11-12 |
| CN101302582B true CN101302582B (en) | 2010-06-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115830B (en) * | 2009-12-30 | 2014-03-12 | 舞阳钢铁有限责任公司 | Controlled cooling method for plate blank electroslag furnace |
| CN108504895A (en) * | 2018-04-28 | 2018-09-07 | 沈阳赛美特新材料科技有限公司 | Cupro silicon silk material for heating cable and its application |
| CN114990346B (en) * | 2022-05-17 | 2024-01-02 | 钢铁研究总院有限公司 | Electroslag remelting slag system and method for ZCuAl8Mn14Fe3Ni high-manganese aluminum bronze |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4161399A (en) * | 1978-05-08 | 1979-07-17 | Allegheny Ludlum Industries, Inc. | Method for electroslag remelting of a manganese-copper-nickel alloy |
| SU522748A1 (en) * | 1975-05-07 | 1987-02-07 | Государственный научно-исследовательский и проектный институт сплавов и обработки цветных металлов "Гипроцветметобработка" | Flux for electroslag remelting of metals |
| SU486690A1 (en) * | 1974-06-11 | 1987-02-07 | Государственный научно-исследовательский и проектный институт сплавов и обработки цветных металлов "Гипроцветметобработка" | Flux |
| CN1580300A (en) * | 2003-10-24 | 2005-02-16 | 河南中原特殊钢厂 | Copper alloy electroslag remelting process |
| CN1616700A (en) * | 2003-08-28 | 2005-05-18 | 河南中原特殊钢厂 | Steel for processing movement limiting core stick of continuous tube grimper and its producing process |
| CN1619000A (en) * | 2003-11-19 | 2005-05-25 | 中国科学院金属研究所 | Production method of low oxygen low foreign impurity copper chromium alloy contact head |
-
2008
- 2008-07-04 CN CN2008101404897A patent/CN101302582B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU486690A1 (en) * | 1974-06-11 | 1987-02-07 | Государственный научно-исследовательский и проектный институт сплавов и обработки цветных металлов "Гипроцветметобработка" | Flux |
| SU522748A1 (en) * | 1975-05-07 | 1987-02-07 | Государственный научно-исследовательский и проектный институт сплавов и обработки цветных металлов "Гипроцветметобработка" | Flux for electroslag remelting of metals |
| US4161399A (en) * | 1978-05-08 | 1979-07-17 | Allegheny Ludlum Industries, Inc. | Method for electroslag remelting of a manganese-copper-nickel alloy |
| CN1616700A (en) * | 2003-08-28 | 2005-05-18 | 河南中原特殊钢厂 | Steel for processing movement limiting core stick of continuous tube grimper and its producing process |
| CN1580300A (en) * | 2003-10-24 | 2005-02-16 | 河南中原特殊钢厂 | Copper alloy electroslag remelting process |
| CN1619000A (en) * | 2003-11-19 | 2005-05-25 | 中国科学院金属研究所 | Production method of low oxygen low foreign impurity copper chromium alloy contact head |
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