CN102794437A - Electroslag remelting method for producing large steel ingot by multiple small furnaces - Google Patents
Electroslag remelting method for producing large steel ingot by multiple small furnaces Download PDFInfo
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- CN102794437A CN102794437A CN2012102475843A CN201210247584A CN102794437A CN 102794437 A CN102794437 A CN 102794437A CN 2012102475843 A CN2012102475843 A CN 2012102475843A CN 201210247584 A CN201210247584 A CN 201210247584A CN 102794437 A CN102794437 A CN 102794437A
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Abstract
The invention relates to an electroslag remelting method for producing a large steel ingot by multiple small furnaces, which is an electroslag remelting process for remelting the consumable electrodes melted by a plurality of furnaces to be an electroslag ingot in a multiphase electroslag furnace. In the electroslag remelting method, the electrodes of three furnaces are used, each furnace is provided with 9-18 electrodes and the numbers of electrodes in all furnaces are equal, and the weight of each one of the electrodes of each furnace is the same; and the electroslag remelting method comprises the following steps of: preparing consumable electrodes, assembling the consumable electrodes, proportioning slag charges, remelting and refining, deoxidizing, and demoulding. According to the invention, a plurality of the consumable electrodes of the furnaces are produced by virtue of the present small furnaces, and the large electroslag with high uniformity is economically and effectively obtained via a principle of melting a large product by small furnaces. Therefore, the heavy investment needed by building large steel-making equipment can be reduced, a problem of the low utilization rate of huge steel-making equipment is avoided, and the capacity of the present small melting equipment is given a full play; simultaneously, the mechanical equipment of the electroslag furnace is simple and light, and the capacity of a transformer for the furnace is greatly reduced.
Description
Technical field
The present invention relates to a kind of manufacturing approach of steel ingot, be specifically related to a kind of uniformity obtains a plurality of ports production large-scale steel ingots of large steel ingot with bogey electroslag remelting process that improves.
Background technology
The high parameter of great type equipment, big capacity development make the size of heavy forging, tonnage increasing, and the forging quality performance requirement are increasingly high.Forging is big more, and quality requirement is high more, and the risk that forging is scrapped is also just big more.The metallurgical quality of steel ingot is basis and the prerequisite that obtains heavy forging, in heavy forging production, plays key effect.
The production of steel ingot was divided into for two steps usually, i.e. melting and casting.Electroslag remelting then unites two into one melting and casting two procedures, and in same metal pattern, two procedures is carried out simultaneously, accomplish simultaneously, and ingot mould is a Forced water cooling.In the esr process, with the form of film microfusion, slag/steel reaction contact-making surface is big in slag bath for metal, and the slag temperature is high, and slag bath is active, and metal receives the strong effective refining of slag and purifies.In remelting and ingot casting, carry out in the process, molten steel does not contact refractory material all the time, and ingress of air is not avoided the pollution and the secondary oxidation of refractory material.Particularly ESR ingot solidifies the cooling naturally that is not common, but under the very steep thermograde condition of Forced water cooling, carries out, and has directed progressive crystallization characteristics.Like this; Electroslag remelting had both been created the good condition of refining purification metal internally; Stopped the source of field trash again from the outside, especially had, also united two into one melting and ingot casting two procedures for the vital superior cooling condition of crystallization; All the time do not contact refractory material, avoid secondary oxidation.These for solving " degree of purity " and " uniformity " two big metallurgical quality difficult problems of large steel ingot in the world today, provide the optimum condition that both are combined closely; And equipment is simple, investment saving, and technology is flexible; Adaptability, controllability are strong, and operation being easy to grasp, and reliability is high; Economical rationality is effective, is to produce heavy forging with the huge steel ingot desirable method of the huge steel ingot of high-alloy steel particularly.
The 150t electroslag furnace that east, the Shenyang advanced technology of preparing of big material ERC produces is accomplished with a consutrode remelting, and it is a lot of at the interior 150t of being greater than that this root consutrode connects remainder band cap mouth, at least should be about 170t.This will run into a series of problems:
1. the production greater than the consutrode of 150t is not the easy thing of part, and melting and casting facility are all very huge;
2. weld all very bothersomely greater than the cap mouth cutting of the consutrode of 150t and dummy electrode, and cutting and welding equipment are all very huge;
3. greater than the very big segregation of the inevitable existence of the consutrode of 150t, especially for high-alloy steel, a so big electrode segregation is extremely serious, and this macrosegregation unavoidably will change in the ESR ingot;
4. huge greater than the supporting construction of the consutrode of 150t, make the electroslag furnace plant equipment become complicated;
5. the melting supply of electric power capacity greater than the consutrode of 150t is huge, makes the electroslag furnace power supply unit bulky complex that becomes.
The above, except feasibility and investment are huge, the 3rd and the 1st homogeneity question that then relates to large-scale ESR ingot.
Chinese patent notification number CN 1270852C, on August 23 2006 day for announcing, name is called electroslag remelting feeding technology; This application case discloses a kind of electroslag remelting feeding technology; Be connected to form the loop by consutrode, slag bath, metal bath, ingot casting, end water tank through lead and transformer, an end of consutrode inserts slag bath, through the current flow heats remelting through the loop; Before remelting will finish; Change metal consumable electrode into graphite electrode, and continue power supply, till the end reflow operation that has a power failure.Its weak point is that electroslag remelting feeding technology is to alleviate the loose head density of improving steel ingot of shrinkage cavity, can not control the uniformity of each composition in the large-scale ESR ingot production process.
Summary of the invention
The objective of the invention is in order to solve prior art in carrying out large-scale ESR ingot production process; In the problem that each composition height of control evenly exists, utilize existing bogey to produce some stove consutrodes are produced large-scale steel ingot through a plurality of ports that obtain the large-scale ESR ingot of high uniformity with little molten the earth electroslag remelting process and provide a kind of.
To achieve these goals, the present invention adopts following technical scheme:
A kind of a plurality of port is produced the electroslag remelting process of large-scale steel ingot; It is a kind of electroslag remelting process that consutrode remelting in the three-phase electricity slag hearth of many stoves melting is become an ESR ingot; Said electroslag remelting process adopts three stove electrodes; Every stove electrode radical is the 9-18 root, and the radical of each stove electrode is identical, and every weight of each stove electrode is identical; Add double deoxidizer in the remelting refining process.
In the present technique scheme, each composition of the employed consutrode of electroslag remelting all has difference in various degree.When remelting is produced; Each uses the electrode of specifying heat (batch) number mutually, and the radical of each stove electrode is identical, and the radical of electrode can obtain the weight of ESR ingot as required and confirm; When consumbuble-electrode melting is finished, the gross weight that all consutrodes are removed remainder is the weight of ESR ingot.Consutrode remelting by different bogeys becomes a large-scale ESR ingot; Both can save and build the required huge investment of large-scale steelmaking equipment; Do not have the not high misgivings of huge steelmaking equipment utilization rate again, can also give full play to the ability of existing small-sized smelting equipment, the electroslag furnace plant equipment is simply light simultaneously; Stove reduces with transformer capacity greatly, and the electrical equipment capacity of the 150t electroslag furnace only electrical equipment capacity with the 15t high power electric arc furnace is suitable.
In the esr process, with the form of film microfusion, slag steel reaction contact-making surface is big in slag bath for metal; The slag temperature is high, and slag bath is active, and metal receives the strong effective refining of slag and purifies; Carry out in the process simultaneously in remelting and ingot casting; Molten steel does not contact refractory material all the time, and ingress of air is not avoided refractory material and polluted and secondary oxidation.
Double deoxidizer is adapted to the various steels remelting, has very strong deoxidation effect, reduces field trash, improves degree of purity.In electroslag remelting process, using double deoxidizer, is that the deoxidier fusing point is lower on the one hand, more with even dispersion and participation reaction simultaneously, strengthens deoxidation effect; Deoxidation products is easier to form the low melting point salt on the other hand, thereby keeps the high cleanliness of ESR ingot.
As preferably, said double deoxidizer is silicomanganese calcium ternary deoxidier or sial calcium ternary deoxidier.
As preferably, the double deoxidizer consumption of ESR ingot per ton is 1.5-3kg, whenever adds double deoxidizer at a distance from 3-5min.
As preferably, the used slag charge of said proportioning slag charge is electro-corundum, lime stone and fluorite, and wherein, electro-corundum: lime stone: the weight ratio of fluorite is 1-1.5:1:2.5-3.
As preferably, electroslag remelting process comprises prepares consutrode, assembling consutrode, proportioning slag charge, remelting refining, deoxidation, the demoulding.
The invention has the beneficial effects as follows:
Equipment is simple, investment seldom, technology is flexible, adaptability, controllability are strong, operation being easy to grasp, reliability is high, economical rationality is effective.The present invention utilizes existing bogey to produce some stove consutrodes through obtain the large-scale ESR ingot of high uniformity effectively with little molten large economy.This both can save and build the required huge investment of large-scale steelmaking equipment; There is not the not high sorrow of huge steelmaking equipment utilization rate again; Can also give full play to the ability of existing small-sized smelting equipment, the electroslag furnace plant equipment is simply light simultaneously, and stove reduces with transformer capacity greatly.
The strong refining catharsis and the controlled rapid solidification function of electroslag remelting make the few and small and dispersed of the pure field trash of ESR ingot quality simultaneously, and the even degree of segregation of composition is little, and dense structure does not have coagulation defects such as loose shrinkage cavity, have excellent metallurgical quality; Produce heavy forging with ESR ingot, the high used steel ingot weight of steel ingot utilization rate is little; The material savings of this high usage has not only produced great economic benefit, and factory building foundation, workshop scale, lifting transportation and forging equipment capacity all reduce greatly.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is done further explanation:
Embodiment 1
Adopting electroslag remelting process to produce weight at the three-phase electricity slag hearth is that the concrete steps of large-scale ESR ingot of 120t are following:
1) preparation of electroslag remelting: adopt the three-phase electroslag refining furnace; Adopt copper wall water mold and water cooled bottom plate, the specification of crystallizer be φ 2000/ φ 2025/ φ 2060 * (3200+2300) mm promptly to go up diameter be 2000mm, following diameter is 2060mm, highly is 5500mm;
2) prepare consutrode: use A, B, C 3 stove electrodes, 9 consutrodes of every stove, totally 27 consutrodes, the every heavy 4.7t of electrode, A, B, each each constituent content of stove consutrode of C are seen table 1;
3) proportioning slag charge: slag charge is electro-corundum, lime stone and fluorite, and wherein, the weight ratio of electro-corundum, lime stone, high-purity fluorite is 1.5:1:2.5;
4) remelting refining: the slag charge that the part proportioning is good adds the crystallizer bottom, in crystallizer, switches on then and ignites, and all joins slag charge in the crystallizer gradually, and is clear until wholeization of slag charge; The fit on consutrode in the clear back of wholeization of slag charge after comsumable melt puts in place in the stove, changes to next group consutrode continuation remelting to all consutrode remelting and finishes; The leaving water temperature of crystallizer and water cooled bottom plate is no more than 50 ℃ during the electroslag remelting;
5) demoulding: electroslag remelting finishes back demoulding in 3-6 hour, and heat is sent into stove then.
In esr process, be stained with slag and observe the slag look, if the slag look is not white in color, then when remelting, is interrupted and whenever added double deoxidizer silicomanganese calcium ternary deoxidier at a distance from 3 minutes, the consumption of ESR ingot per ton is 1.5kg; Wherein, double deoxidizer silicomanganese calcium ternary deoxidier is newly created metallurgical material Co., Ltd available from Anyang.
In the upper, middle and lower portion sampling of present embodiment 120t ESR ingot, its uniformity is carried out complete analysis, analysis result is seen table 2;
Embodiment 2
Adopting electroslag remelting process to produce weight at the three-phase electricity slag hearth is that the concrete steps of large-scale ESR ingot of 85t are following:
1) preparation of electroslag remelting: adopt the three-phase electroslag refining furnace; Adopt copper wall water mold and water cooled bottom plate, the crystallizer specification is φ 1780/ φ 1815/ φ 1860 * (2850+2050) mm, and promptly going up diameter is 1780mm, and following diameter is 1860mm, highly is 4900mm;
2) prepare consutrode: use first, second, the third 3 stove electrodes, 12 consutrodes of every stove, totally 36 consutrodes, the every heavy 2.46t of consutrode, first, second, third each each constituent content of stove consutrode are seen table 3;
3) proportioning slag charge: slag charge is electro-corundum, lime stone and fluorite, and wherein, the weight ratio of electro-corundum, lime stone, fluorite is 1.25:1:2.25;
4) remelting refining: the slag charge that the part proportioning is good adds the crystallizer bottom, in crystallizer, switches on then and ignites, and all joins slag charge in the crystallizer gradually, and is clear until wholeization of slag charge; The fit on consutrode in the clear back of wholeization of slag charge after comsumable melt puts in place in the stove, changes to next group consutrode continuation remelting and finishes until all consutrode remeltings; The leaving water temperature of crystallizer and water cooled bottom plate is no more than 50 ℃ during the electroslag remelting;
5) demoulding: electroslag remelting finishes back demoulding in 2-5 hour, air cooling cleaning then.
In esr process, be stained with slag and observe the slag look, if the slag look is not white in color, when remelting, is interrupted and whenever added double deoxidizer silicomanganese calcium ternary deoxidier at a distance from 5 minutes, the consumption of ESR ingot per ton is 2kg; Wherein, double deoxidizer silicomanganese calcium ternary deoxidier is newly created metallurgical material Co., Ltd available from Anyang.
In the upper, middle and lower portion sampling of present embodiment 85t ESR ingot, its uniformity is carried out complete analysis, the result sees table 4;
Embodiment 3
Adopting electroslag remelting process to produce weight at the three-phase electricity slag hearth is that the concrete steps of large-scale ESR ingot of 100t are following:
1) preparation of electroslag remelting: adopt the three-phase electroslag refining furnace; Adopt copper wall water mold and water cooled bottom plate, the specification of crystallizer is φ 1900/ φ 1960 * (2850+2250) mm, and promptly going up diameter is 1900mm, and following diameter is 1960mm, highly is 5100mm;
2) prepare consutrode: use A1, A2, A3 totally 3 stove electrodes, 18 consutrodes of every stove, totally 54 consutrodes, the every heavy 1.95t of consutrode, A1, A2, each each constituent content of stove consutrode of A3 are seen table 5;
3) proportioning slag charge: slag charge is electro-corundum, lime stone and fluorite, and wherein, the weight ratio of electro-corundum, lime stone, fluorite is 1:1:3;
4) remelting refining: the slag charge that the part proportioning is good adds the crystallizer bottom, in crystallizer, switches on then and ignites, and all joins slag charge in the crystallizer gradually, and is clear until wholeization of slag charge; The fit on consutrode in the clear back of wholeization of slag charge after comsumable melt puts in place in the stove, changes to next group consutrode continuation remelting and finishes until all consutrode remeltings; The leaving water temperature of crystallizer and water cooled bottom plate is no more than 50 ℃ during the electroslag remelting;
5) demoulding: electroslag remelting finishes back demoulding in 3-6 hour, and heat is sent into stove then.
In esr process, be stained with slag and observe the slag look, if the slag look is not white in color, when remelting, is interrupted and whenever added double deoxidizer sial calcium ternary deoxidier at a distance from 4 minutes, ESR ingot consumption per ton is 3kg; Wherein, double deoxidizer sial calcium ternary deoxidier is newly created metallurgical material Co., Ltd available from Anyang.
In the upper, middle and lower portion sampling of the heavy forging of present embodiment 100t ESR ingot, its uniformity is carried out complete analysis, the result sees table 6;
Table 1, each component of embodiment 1 consutrode and content
Table 2, embodiment 1 prepared ESR ingot analysis of Uniformity result
Table 3, each component of embodiment 2 consutrodes and content
Table 4, embodiment 2 prepared ESR ingot analysis of Uniformity results
Table 5, each component of embodiment 3 consutrodes and content
Table 6, embodiment 3 prepared ESR ingot analysis of Uniformity results
Through table 2, table 4, table 6; Can it is evident that; Adopt the present invention through promoting the characteristics of crystallographic orientation rapid solidification, metallurgical imperfection conditions such as shrinkage cavity, segregation take place have not been existed, and then obtain very high uniformity; Dense structure, remaining field trash is able to height refinement and disperse in the steel.
Claims (5)
1. a plurality of ports are produced the electroslag remelting process of large-scale steel ingots; It is a kind of electroslag remelting process that consutrode remelting in the three-phase electricity slag hearth of many stoves melting is become an ESR ingot; It is characterized in that said electroslag remelting process adopts three stove electrodes, every stove electrode radical is the 9-18 root; The radical of each stove electrode is identical, and every weight of each stove electrode is identical; Add double deoxidizer in the remelting refining process.
2. a kind of a plurality of ports according to claim 1 are produced the electroslag remelting process of large-scale steel ingot, it is characterized in that said double deoxidizer is silicomanganese calcium ternary deoxidier or sial calcium ternary deoxidier.
3. a kind of a plurality of ports according to claim 1 are produced the electroslag remelting process of large-scale steel ingot, it is characterized in that the double deoxidizer consumption of ESR ingot per ton is 1.5-3kg, and are every at a distance from 3-5min adding double deoxidizer.
4. produce the electroslag remelting process of large-scale steel ingots according to claim 1 or 2 or 3 described a kind of a plurality of ports; It is characterized in that; The used slag charge of said proportioning slag charge is electro-corundum, lime stone and fluorite, and wherein, electro-corundum: lime stone: the weight ratio of fluorite is 1-1.5:1:2.5-3.
5. a kind of a plurality of ports according to claim 4 are produced the electroslag remelting process of large-scale steel ingot, it is characterized in that, electroslag remelting process comprises prepares consutrode, assembling consutrode, proportioning slag charge, remelting refining, deoxidation, the demoulding.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945260A (en) * | 2016-06-02 | 2016-09-21 | 浙江电渣核材有限公司 | Electroslag remelting method for producing large steel ingots by plurality of small furnaces |
| CN112210692A (en) * | 2020-09-10 | 2021-01-12 | 新余市长城铜产品开发有限公司 | Beryllium bronze long guide rail and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1358776A (en) * | 1971-06-11 | 1974-07-03 | Inst Elektroswarki Patona | Method of electroslag casting of ingots |
| CN1059371A (en) * | 1990-08-20 | 1992-03-11 | 上海重型机器厂 | The electroslag remelting technique of the low aluminium of control |
| CN1078416A (en) * | 1992-05-15 | 1993-11-17 | 上海重型机器厂 | A kind of inhomogeneity method of steel ingot control composition of producing |
| CN101469370A (en) * | 2007-12-28 | 2009-07-01 | 上海重型机器厂有限公司 | Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot |
-
2012
- 2012-07-18 CN CN2012102475843A patent/CN102794437A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1358776A (en) * | 1971-06-11 | 1974-07-03 | Inst Elektroswarki Patona | Method of electroslag casting of ingots |
| CN1059371A (en) * | 1990-08-20 | 1992-03-11 | 上海重型机器厂 | The electroslag remelting technique of the low aluminium of control |
| CN1078416A (en) * | 1992-05-15 | 1993-11-17 | 上海重型机器厂 | A kind of inhomogeneity method of steel ingot control composition of producing |
| CN101469370A (en) * | 2007-12-28 | 2009-07-01 | 上海重型机器厂有限公司 | Method for manufacturing large-sized high purity 12Cr% low-ilicon low-aluminum electroslag remelting steel ingot |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105945260A (en) * | 2016-06-02 | 2016-09-21 | 浙江电渣核材有限公司 | Electroslag remelting method for producing large steel ingots by plurality of small furnaces |
| CN112210692A (en) * | 2020-09-10 | 2021-01-12 | 新余市长城铜产品开发有限公司 | Beryllium bronze long guide rail and manufacturing method thereof |
| CN112210692B (en) * | 2020-09-10 | 2021-12-17 | 新余市长城铜产品开发有限公司 | Beryllium bronze long guide rail and manufacturing method thereof |
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Application publication date: 20121128 |