EP1334214A1 - Method and device for producing ingots or strands of metal by melting electrodes in an electroconductive slag bath - Google Patents
Method and device for producing ingots or strands of metal by melting electrodes in an electroconductive slag bathInfo
- Publication number
- EP1334214A1 EP1334214A1 EP01996632A EP01996632A EP1334214A1 EP 1334214 A1 EP1334214 A1 EP 1334214A1 EP 01996632 A EP01996632 A EP 01996632A EP 01996632 A EP01996632 A EP 01996632A EP 1334214 A1 EP1334214 A1 EP 1334214A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- mold
- slag bath
- conducting element
- base plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
- B22D23/10—Electroslag casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
Definitions
- the invention relates to a method for producing blocks or strands of metal - in particular from steel as well as Ni and Co-based alloys - by melting self-consuming electrodes in an electrically conductive slag bath using alternating or direct current in a short, after water-cooled mold open at the bottom, via which a current contact to the slag bath can be established.
- the invention also includes a device for performing this method.
- remelting blocks are produced using the process of electroslag remelting in stand molds - but also in short slide molds - it is common, depending on the susceptibility of the remelted alloy to segregate, to set a melting rate in kilograms (kg) per hour, which for round blocks is between 70% and 110% of the block diameter in millimeters (mm).
- a melting rate in kilograms (kg) per hour, which for round blocks is between 70% and 110% of the block diameter in millimeters (mm).
- an equivalent diameter can be used, which is calculated from the cross-sectional circumference divided by the number ⁇ (Pi).
- the lower area is mainly used for strongly segregating alloys - such as tool steels or high-alloyed nickel base alloys - in which a flat metal sump is aimed at to avoid segregation.
- the value of 70% can hardly be undercut in the conventional ESR process, since then the power supply from the melting electrode into the slag bath has to be reduced very much, which results in a low temperature of the slag bath and subsequently a poor, often grooved surface of the remelting block has the consequence. If the power supply is too low for Slag bath then often also forms a thick slag jacket between the block and the mold, which in turn hinders the heat dissipation from the block surface, so that the desired flat melt sump cannot be achieved.
- the slag bath temperature and the melting rate are - and in context thus the depth of the swamp and the formation of the surface - closely linked and cannot be controlled and controlled independently of one another and separately.
- the melting rate with increased power supply to the slag bath occurs because the melting electrode serves on the one hand to supply energy to the slag bath, but on the other hand all the more melts faster, the more you increase the energy supply to the slag bath.
- the electrode must then be fed into the slag bath at the speed at which it melts. If the melting electrode were not topped up, it would melt to just above the surface of the slag bath, which would interrupt the electrical contact and thus the power supply to the slag bath. The remelting process would come to a standstill.
- Another way to increase the slag bath is of smaller diameter electrodes zen umzusch 'mel-.
- the end face of the electrode immersed in the slag bath is smaller, so that a comparatively hotter slag bath is required in order to achieve the desired melting rate.
- this measure can often be used to improve the surface of the block, the use of small-diameter electrodes leads to an increased heat concentration in the center of the block, which can result in a V-shaped recessed sump with an increased tendency to segregate.
- EP 786 521 B1 by the applicant shows a process for remelting electroslag in which, by melting electrodes of comparatively large diameter, higher deposition rates are set than in conventional electroslag remelting.
- part of the melt flow can be returned via current-conducting elements built into the mold wall. The arrangement leads to a division of the return line currents incorrectly proportional to the total resistance of the conductor loops used.
- the inventor set the goal of being able to control the melting rate of the electrode independently of the temperature of the slag bath and at the same time to ensure a good block surface.
- the melting rate of the consumable electrode can be controlled in a simple manner by the feed rate with which it is pushed into the overheated slag bath.
- the achievable melting rate will be higher the larger the end face and the immersion depth of the electrode immersed in the slag bath and the higher its temperature.
- the melting electrode can be completely currentless.
- the block sump can also remain de-energized or a partial flow can be applied.
- a circuit as a cathode is also of interest for the block sump for the reasons mentioned above. If the block and the electrode are connected as the cathode, the return line can take place via current-conducting elements in the mold connected as an anode.
- the remelting blocks formed in the lower part of the mold can either be pulled down from this or the mold is raised in the manner in which the block standing on a base plate grows.
- the present invention thus relates to a method for producing blocks or strands from metals, in particular from steels and Ni and Co base alloys, by melting self-consuming electrodes in an electrically conductive slag bath in a short, water-cooled mold which is open at the bottom and is built into the mold wall current conducting elements, about which in In a manner known per se, a current contact to the slag bath can be produced, the melt flow supplied being able to be introduced into the slag bath both via the remelting block and the melt sump and, if appropriate, at least one current-conducting element of the mold, the melt flow being returned via at least one current-conducting element of the mold , which is electrically insulated from any former and also the part of the mold that forms the remelting block.
- the proportion of current supplied via the melting electrode can be 0 to 100% of the total supplied melting current.
- the short, current-conducting mold can be permanently installed in a work platform and the remelting block can be removed downwards.
- the block can also be built up on a fixed base plate and the mold can be raised in the manner in which the block grows.
- the block can be removed or the mold can be lifted continuously or step by step.
- an additional counter-stroke step can directly follow each stroke step, the step length of which can be up to 60% of the step length of the withdrawal stroke step.
- Fig. 3 an enlarged section through Fig. 2 along the line III - III.
- a water-cooled mold 10 with a hollow ring-shaped mold body 12 is assigned a bottom plate 14, which in turn is hollow, according to FIG. 1, the outer diameter of which is slightly shorter than the inner diameter d of the mold 10;
- the base plate 14 can be pushed into the mold opening or the mold interior space 11 of height h until it runs directly below the upper edge 13 of the mold hollow body 12.
- a ring-like insulating element 16 rests on the upper edge 13 and a current-conducting element 18 — likewise ring-like and / or made of several parts — rests on this; the latter is electrically insulated from the - nonconductive - insulating elements 16 against the water-cooled lower region 20 of the mold 10 and is separated from the top by an upper insulating element 16 a from a water-cooled hollow ring 22.
- the upper insulating element 16 a is not absolutely necessary.
- liquid slag can, for example, be poured into the mold gap delimited by the mold 10 and the electrode 28, until the slag level 25 of the slag bath 24 that is formed approximately becomes the upper edge of the current-conducting element 16 a has reached.
- the supply of the melt stream to the slag bath 26 from an AC or DC source 36 takes place - depending on the position of high-current contacts 38 and 39 - in high-current lines 32, 32 a either only via the electrode 28 or only via the base plate 14, the remelting block 30 and the Melt sump 24 or at the same time via electrode 28 and base plate 14, the proportions of the current flowing through electrode 28 and base plate being adjustable by means of adjustable resistors 42, 42 a or other devices which are comparable in their effect.
- the entire melt flow is returned exclusively via the current-conducting element 18 built into the mold wall and a return line 35 connecting it to the current source 36.
- the mold 10 is provided with at least two by insulating elements 16, 16 a both against one another and against the lower region 20 of the mold 10 and — in this case — against the upper region 22 of the mold 10, namely those Hollow ring 12, insulated current conducting elements 18, 18 a .
- FIG. 3 shows two partially circular current-conducting elements 18, 18 a , which are separated from one another by — correspondingly shaped insulating elements 16 b — forming a ring with them; If, as described here, two or more current-conducting elements 18, 18 a lying at different potentials are required, these can also be formed in a circular manner as a ring and arranged one above the other and in particular in the case of molds 10 with a circular cross section around a longitudinal axis A. angeord- Neten - also annular - insulating elements 16 to be isolated from each other.
- current can be fed from the right-hand current source 36 in FIG. 2 either only via the electrode 28 through line 32 or only via base plate 14 together with block 30 through line 32 a or via both together into the slag bath 26 .
- the division of the current can be adjusted by means of adjustable resistors 42, 42 a .
- the return can then take place via one of the two current-conducting elements - here 18 - the mold 10 and return line 35. From return line 35 leads a branch line 37 to the left power source 36 a , which on the other hand is connected by a line 31 to the current-carrying element 18 a .
- the current source 36 is a direct current source, it is possible to switch the electrode 28 and block 30 as a cathode.
- a common return line is returned from at least one further current-conducting element 18, which is insulated from the former and from the lower and the upper region 20 and 22 of the mold 10, to the three power supplies 36, 36 a , 36 b.
- the individual circuits can be interrupted via high-current switches 41, 41 a , 41 b in return line 35 or branch lines 37 a , 37 b . This arrangement enables different ways of working. If three alternating current sources 36, 36 a , 36 b connected in parallel are used as melt current supplies , then independently adjustable currents can be run via each of the feed lines 32, 31, 31 a .
- the three power supplies or power sources 36, 36 a , 36 b can, for example, also be connected to the three phases of a three-phase power supply, the return line being led to the star point. This makes it possible to build up a Ruhr movement induced by the rotating field in the slag bath and metal sump.
- An AC power source can then be used as the power supply 36 a , which ensures efficient heating of the slag bath 24 via the current-conducting elements 18, 18 a of the mold 10.
- the electrode 28 and the slag bath 24 can be protected against air access by gas-tight hoods, not shown here, which can also be sealed against the mold flange. This allows the remelting to take place in a controlled atmosphere and the exclusion of atmospheric oxygen, which also enables the production of highly pure remelting blocks 30 and prevents burn-off of oxygen-affine elements.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0190500A AT410413B (en) | 2000-11-14 | 2000-11-14 | METHOD FOR ELECTROSHELL MELTING OF METALS |
AT19052000 | 2000-11-14 | ||
PCT/EP2001/013012 WO2002040726A1 (en) | 2000-11-14 | 2001-11-09 | Method and device for producing ingots or strands of metal by melting electrodes in an electroconductive slag bath |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1334214A1 true EP1334214A1 (en) | 2003-08-13 |
EP1334214B1 EP1334214B1 (en) | 2005-03-02 |
Family
ID=3689284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01996632A Expired - Lifetime EP1334214B1 (en) | 2000-11-14 | 2001-11-09 | Method and device for producing ingots or strands of metal by melting electrodes in an electroconductive slag bath |
Country Status (7)
Country | Link |
---|---|
US (1) | US6913066B2 (en) |
EP (1) | EP1334214B1 (en) |
JP (1) | JP3676781B2 (en) |
AT (1) | AT410413B (en) |
AU (1) | AU2002221836A1 (en) |
DE (2) | DE50105485D1 (en) |
WO (1) | WO2002040726A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1925681B1 (en) | 2006-11-15 | 2011-04-27 | Inteco special melting technologies GmbH | Method for electro slag remelting of metals and mould therefor |
AT504574B1 (en) * | 2006-11-15 | 2009-08-15 | Inteco Special Melting Technol | METHOD OF ELECTRIC SLACKING METHODS OF MELTING METALS |
AT509736B1 (en) * | 2010-05-14 | 2012-03-15 | Inteco Special Melting Technologies Gmbh | METHOD AND DEVICE FOR CONTINUOUS RECORDING OF SLAG LEVEL IN ESU PLANTS WITH SHORT SLIDE COILS |
AT515566A1 (en) * | 2014-03-06 | 2015-10-15 | Inteco Special Melting Technologies Gmbh | Method for cooling liquid-cooled molds for metallurgical processes |
CN105483391B (en) * | 2015-12-11 | 2017-08-11 | 东北大学 | Determine the device and method of technological parameter in the esr process of single supply double loop |
CN110548840B (en) * | 2019-10-09 | 2024-04-02 | 辽宁科技大学 | Device and method for adding heating solid-state protecting slag into crystallizer in continuous casting process |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5411803A (en) * | 1977-06-30 | 1979-01-29 | Inst Elektroswarki Patona | Apparatus for remelting and surfacing electroslag |
JPS5443803A (en) * | 1977-09-12 | 1979-04-06 | Inst Elektroswarki Patona | Mold for electroslag remelting and surfacing apparatus |
WO1980001574A1 (en) * | 1979-01-31 | 1980-08-07 | Inst Elektroswarki Patona | Method and device for controlling a process of electroslag remelting of consumable electrodes in widen crystallizer |
US4291744A (en) * | 1979-02-14 | 1981-09-29 | Medovar Boris I | Apparatus for electroslag remelting of consumable electrodes |
DE2942485A1 (en) * | 1979-10-20 | 1981-04-30 | Leybold-Heraeus GmbH, 5000 Köln | Ferro-zirconium prodn. by electroslag remelting - of ferrous hollow body contg. mixt. of zirconium oxide and calcium |
US4612649A (en) * | 1983-11-10 | 1986-09-16 | Cabot Corporation | Process for refining metal |
AT406384B (en) * | 1996-01-29 | 2000-04-25 | Inteco Int Techn Beratung | METHOD FOR ELECTROSHELL STRAND MELTING OF METALS |
AT406239B (en) * | 1996-04-09 | 2000-03-27 | Inteco Int Techn Beratung | Water-cooled mould for continuous casting or electroslag remelting |
DE19614182C1 (en) * | 1996-04-11 | 1997-07-31 | Inteco Int Techn Beratung | Water-cooled casting die for production of blocks or strips |
-
2000
- 2000-11-14 AT AT0190500A patent/AT410413B/en not_active IP Right Cessation
-
2001
- 2001-11-09 DE DE50105485T patent/DE50105485D1/en not_active Expired - Lifetime
- 2001-11-09 JP JP2002543035A patent/JP3676781B2/en not_active Expired - Fee Related
- 2001-11-09 AU AU2002221836A patent/AU2002221836A1/en not_active Abandoned
- 2001-11-09 DE DE10154721A patent/DE10154721A1/en not_active Withdrawn
- 2001-11-09 US US10/416,823 patent/US6913066B2/en not_active Expired - Fee Related
- 2001-11-09 WO PCT/EP2001/013012 patent/WO2002040726A1/en active IP Right Grant
- 2001-11-09 EP EP01996632A patent/EP1334214B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0240726A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2004522852A (en) | 2004-07-29 |
WO2002040726A1 (en) | 2002-05-23 |
AU2002221836A1 (en) | 2002-05-27 |
ATA19052000A (en) | 2002-09-15 |
DE50105485D1 (en) | 2005-04-07 |
AT410413B (en) | 2003-04-25 |
US20040040688A1 (en) | 2004-03-04 |
DE10154721A1 (en) | 2002-05-23 |
EP1334214B1 (en) | 2005-03-02 |
JP3676781B2 (en) | 2005-07-27 |
US6913066B2 (en) | 2005-07-05 |
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