CN101293273A - Process for manufacturing low-aliquation large-scale hollow steel ingot - Google Patents
Process for manufacturing low-aliquation large-scale hollow steel ingot Download PDFInfo
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- CN101293273A CN101293273A CNA2008100115368A CN200810011536A CN101293273A CN 101293273 A CN101293273 A CN 101293273A CN A2008100115368 A CNA2008100115368 A CN A2008100115368A CN 200810011536 A CN200810011536 A CN 200810011536A CN 101293273 A CN101293273 A CN 101293273A
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- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000005266 casting Methods 0.000 claims abstract description 23
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D9/00—Machines or plants for casting ingots
- B22D9/006—Machines or plants for casting ingots for bottom casting
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Abstract
The invention relates to a technology for casting a large hollow steel ingot, in particular to a method for manufacturing a low segregation large hollow steel ingot. The manufacturing method is applicable to the process for manufacturing the large hollow steel ingot which is less than 250 tons, made of various materials and has various models and specifications. Besides, computer simulation technique is utilized for reasonably designing an steel ingot mould and a gating system, steel structure nesting core pore-forming technology, large air flow cooling technology, injecting stream protection technology and metal liquid early-stage covering technology are mainly adopted in the manufacturing method, thus guaranteeing stability of ingot mold filling, reducing secondary oxide inclusion and improving the purity of the steel ingot. The large air flow cooling technology and the steel structure nesting core pore-forming technology guarantee the operability of casting process, control the segregation position of ingot, reduce the defects of shrinkage cavity and looseness and improve the utilization ration of the hollow steel ingot. By adopting the manufacturing method, the problems that a taper core can not be taken out easily and an inner core body is deformed in the manufacturing process of the large hollow steel ingot are solved, meanwhile, the segregation problem of large hollow steel ingot is relieved.
Description
Technical field
The present invention relates to the foundry engieering of large-sized hollow steel ingot, specifically a kind of manufacture method of low-aliquation large-scale hollow steel ingot.It is applicable to below 250 tons, the large-sized hollow steel ingot manufacture process of various materials, various model and specification.
Background technology
Hollow forging consumptions such as large-scale hydrogenation reactor, main nuclear power pipeline, pipe die are continuing to increase.Especially used large hollow forging demand in recent years is being doubled and redoubled on chemical industry and the energy industry, and utilizes hollow steel ingot to forge the large hollow forging, can play a multiplier effect, so the demand of large-sized hollow steel ingot is growing on and on.The manufacture level of Chinese large-sized hollow steel ingot is not high, and output is also very limited, large-sized hollow steel ingot market has presented that supply falls short of demand state.
The enterprise of ultra-large type hollow steel ingot manufacturing mainly contains the Crusoe company and the Kawasaki, Japan company of France in the world, 200 tons of hollow steel ingots have successfully been poured into a mould by Crusoe company, the hollow steel ingot of producing is mainly used to produce hydrogenation reactor, and 250 tons of hollow steel ingots have successfully been poured into a mould by Kawasaki company, and the hollow steel ingot of production is mainly used to produce forging such as large-scale pipe die.
The manufacturing difficult point of large-sized hollow steel ingot mainly is the control of ingotism position and segregation degree.All there is the segregation problem in large-scale steel ingot, and all segregations all make ingot structure and composition become inhomogeneous.Microsegregation is can eliminating that forging process has, and what have may alleviate, and gross segregation can not be eliminated in forging process, has a strong impact on forging quality.The main cause that segregation produces is that the ingot solidification time is long, and the low melting point enrichment causes, and impurity element has partially also aggravated the segregation of host element simultaneously, and the segregation degree of steel ingot is strengthened.Hollow steel ingot is owing to the method that has adopted ingot mould and fuse to cool off simultaneously, so the segregation degree of steel ingot is less, but the control of segregation location still needs research.
Some enterprise adopts solid steel ingot to forge hollow forging, the A type segregated zone of solid steel ingot is not easy to remove when forging hollow forging, segregated zone is on the inner surface of hollow object just, and the groundwork face of large hollow forging inner surface often, this has just influenced the use of forging.Some hollow forging need carry out the stainless steel built-up welding on inner surface, because forging inner surface impurity element or carbon segregation are serious, bring very big difficulty to welding sequence.If impurity element is too high, even the stainless steel bead-welding technology has been finished, overlay cladding in use also peels off easily, influences parts service life.Adopt hollow steel ingot to forge hollow object, can guarantee that segregation phenomena does not appear in the forging inner surface, reduce the welding difficulty, improve parts service life.
The hollow forging of some large-scale keys, Chevron Research Company (CRC) requires to forge with hollow steel ingot and finishes.And require the segregation of hollow steel ingot must be away from the inner surface of steel ingot, especially super-huge steel ingot be in forging process, and segregated zone is along with the carrying out of forging, move to inner surface, if the segregated zone of steel ingot is far away inadequately from inner surface, in forging process, still can exposing surface.So control ingotism position is the another key that hollow steel ingot is produced.
In this case; the present invention adopts computer modeling technique; at first predicted the position that segregation may exist; utilize big air quantity cooling technology, the nested core hole creating technology of steel construction, the early stage soverlay technique of molten metal, gas shield beam technology etc. to control segregation position and segregation degree effectively again, the hollow steel ingot new preparation technology of exploitation makes the manufacturing low-aliquation large-scale hollow steel ingot become possibility.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of low-aliquation large-scale hollow steel ingot, make in the large-sized hollow steel ingot manufacture process that fuse is difficult for taking out, the inner core-body problem on deformation has obtained solution, alleviated large-sized hollow steel ingot segregation problem simultaneously, hollow steel ingot segregation position is under control.
Technical scheme of the present invention is:
The manufacture method of low-aliquation large-scale hollow steel ingot of the present invention mainly is meant in the low-aliquation large-scale hollow steel ingot preparation process; adopt the nested core hole creating technology of steel construction, big air quantity cooling technology, the early stage soverlay technique of molten metal and gas shield beam technology, controlled position and degree that segregation produces.
1, the nested core hole creating technology of steel construction
(1) technical characterstic: mainly adopt two-layered steel plates formation hollow steel ingot nested against one another inner core-body.In the cast and process of setting of steel ingot, inner core-body is in the steel ingot center, forms the steel ingot centre bore.
(2) design feature: inner core-body is made up of ectonexine steel plate cylinder, ectonexine steel plate cylinder is two concentric drums that differ in size, and inner layer steel plate is embedded among the outer layer plate, and certain interval is arranged between the steel plate, space 5～60m supports with steel pipe between the steel plate between the steel plate.The ectonexine steel plate all welds together with steel pipe, forms the cylindrical core body.Wherein outer layer plate 5～25mm is thick, and inner layer steel plate 5～25mm is thick, 4～60 of supporting steel pipes, diameter of steel tube 5～50mm.Seal with steel plate inner layer steel plate tube upper surface, and pore is opened in the upper surface, and compressed air enters from the upper surface passage, by discharging between the ectonexine steel plate, forms an open loop from following.
(3) main effect: the inner core-body outer layer plate contacts with molten metal in the casting process, plays chilling action, the thermal shock of opposing molten steel.Logical compressed air in the middle of the inner layer steel plate, compressed air cools off outer layer plate by the gap between the ectonexine steel plate, reduces the outer layer plate temperature, keeps the outer layer plate strength and stiffness.Inner layer steel plate rises carries compressed air and supporting role, and steel pipe mainly plays a supportive role.
(4) using method: after the inner core-body manufacturing is finished, fit together, constitute the hollow steel ingot die cavity with ingot mould, top bottom-disc, low bottom-disc.Inner core-body is fixed on the top bottom-disc, and ingot mould is enclosed within the inner core-body outside, and both keep concentric.In the casting process, molten steel solidifies between inner core-body and ingot mould, forms hollow steel ingot.
2, big air quantity cooling technology
(1) technical characterstic: in the ingot steel casting process, utilize compressed air hollow steel ingot to be cooled off by inner core-body.In cooling procedure, a large amount of compressed air are arranged by inner core-body, steel ingot is derived heat take away.By controlling compressed-air actuated pressure and intensity, regulate cooling capacity, thus the process of setting of control steel ingot.
(2) main effect: big air quantity can make the gas return path of whole inner core-body have big pressure, and gas and inner core-body outer layer plate inner surface are had than strong contact, increases heat transfer intensity, adds the cooling effect of atmospheric.In addition, a large amount of gases flow through from inner core-body, and what guaranteed that gas temperature can not rise in the inner core-body is too high, also effectively in increasing the gas cooled ability.
(3) using method: in casting process, finish after the cast, begin to feed compressed air; Compressed-air actuated pressure 0.2～0.8MPa, gas feeding amount 50～400m
3/ min, duration of ventilation are 2～8h.In feeding the compressed air process, can follow the tracks of inner core-body outer layer plate temperature, if find that the outer layer plate temperature is low excessively, can reduce air quantity, if temperature raises, then strengthen air quantity.
3, the early stage soverlay technique of molten metal
(1) technical characterstic: the early stage soverlay technique of molten metal is that coverture is placed on the precalculated position, and after molten metal entered die cavity, the very first time covered coverture equably with the molten metal surface, plays the effect of protection molten steel and purify hot metal.
(2) main effect: coverture evenly is suspended in the hollow steel ingot die cavity, and after molten steel entered die cavity, coverture was heated and falls automatically, covered on metal bath surface, and molten metal is played a protective role.When coverture protection molten steel is not oxidated, molten steel is also had catharsis, inclusion floating in the molten steel combines with covering slag in the coverture, enters covering slag, and the molten steel degree of purity is improved.
(3) using method: coverture can divide two-layer suspension, and ground floor approaches bottom surface, and the second layer approaches rising head, and when molten metal entered die cavity, ground floor coverture first-selection played a protective role; When molten metal continued to rise, surface dopant constantly moved downward along the ingot mould inwall with molten metal, and the top layer coverture is consumed gradually, and at this moment the molten steel heat falls the upper strata coverture, and it is not oxidated to continue the protection molten steel.
4, gas shield beam technology
(1) technical characterstic: high-temperature liquid metal contacts with the air large tracts of land in casting process, and secondary oxidation takes place easily.And the gas shield technology is to utilize indifferent gas that metal liquid stream and air are separated, and the minimizing molten metal contacts with air, thus the oxidation of control molten metal.
(2) main effect: the gas shield cover is a circular cowling, and its inboard has a plurality of ventholes, and the outside and air inlet pipe link, and utilize the gas shield cover that inert gas is more concentrated on around the metal liquid stream, reduces air and flows to the influence of protective gas.After utilizing protective cover that metal liquid stream is covered, feed inert gas in protective cover, inert gas forms gas blanket, and metal liquid stream is wrapped in wherein, has just played the effect that prevents the molten metal oxidation.
(3) using method: before the cast beginning, the gas shield cover is placed on the cup, makes the gas shield cover concentric with the cast gate of casting ladle.After the cast beginning, feed inert gas by air inlet pipe in the gas shield cover, inert gas is evenly discharged by the aperture of giving vent to anger, and forms the gas shield layer around metal liquid stream.
Among the present invention, hollow steel ingot refers to 30～250 tons large-sized hollow steel ingot.
The present invention has following beneficial effect:
The present invention be applicable to each rank below 250 tons, various model and the manufacture process of large-sized hollow steel ingot, can utilize this technology to carry out the exploitation of large-sized hollow steel ingot.
2. the present invention has adopted big air quantity cooling technology, the nested core hole creating technology of steel construction, make in the large-sized hollow steel ingot manufacture process that fuse is difficult for taking out, the inner core-body problem on deformation has obtained solution, alleviated large-sized hollow steel ingot segregation problem simultaneously, hollow steel ingot segregation position is under control, guaranteed the operability of casting technique, control the ingotism position, reduced shrinkage cavity, rarefaction defect, improved the hollow steel ingot utilization rate.
3. the present invention adopts the early stage soverlay technique of molten metal, gas shield beam technology; make large-sized hollow steel ingot in casting process; it is steady to have guaranteed that steel ingot fills type; having reduced secondary oxidation is mingled with; improved the degree of purity of steel ingot; enlarged the range of application of hollow steel ingot, made hollow steel ingot become possibility in multiple enterprises production more.
Description of drawings:
The casting device schematic diagram of Fig. 1 low-aliquation large-scale hollow steel ingot;
Wherein: the 1-low bottom-disc; The 2-top bottom-disc; The 3-ingot mould; The 4-coverture; The 5-outer layer plate; The 6-inner layer steel plate; The 7-warming plate; 8-gas inlet pipe road; The 9-molten metal; The 10-argon gas feeds pipeline; The 11-cup; The 12-sprue; The 13-cross gate; The 14-ingate.
Temperature field simulation figure as a result in Fig. 2 process of setting;
Fig. 3 shrinkage cavity distribution simulation is figure as a result;
Fig. 4 adopts the blank of the inventive method preparation.
The specific embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
As shown in Figure 1, casting device of the present invention comprises low bottom-disc 1, top bottom-disc 2, ingot mould 3, coverture 4, outer layer plate 5, inner layer steel plate 6, warming plate 7, gas inlet pipe road 8, molten metal 9, argon gas feeds pipeline 10, cup 11, sprue 12, cross gate 13, ingate 14, top bottom-disc 2 places on the low bottom-disc 1, top bottom-disc 2 tops: the outer ring is provided with ingot mould 3, inner ring is provided with the hollow steel ingot inner core-body of two-layered steel plates formation nested against one another, inner core-body is an outer layer plate 5, the concentric drums of inner layer steel plate 6 formations nested against one another, outer layer plate 5, between the inner layer steel plate 6 space is arranged, die cavity between ingot mould 3 and the inner core-body forms hollow steel ingot, the die cavity top rising head placed around warming plate 7 between ingot mould 3 and the inner core-body.Running gate system is made of cup 11, sprue 12, cross gate 13, ingate 14, low bottom-disc 1 is offered cross gate 13, top bottom-disc 2 is offered the ingate 14 that communicates with cross gate 13, cup 11 is connected to cross gate 13 by sprue 12, cup 11 tops are provided with argon gas and feed pipeline 10, molten metal 9 enters die cavity by cup 11, sprue 12, cross gate 13, ingate 14 successively, fills type.
Inner layer steel plate 6 inboards are communicated with gas inlet pipe road 8, compressed air enters inner layer steel plate 6 by gas inlet pipe road 8, adopt compressed air that inner core-body is carried out air cooling, compressed air enters from the inner layer steel plate 6 in the middle of the inner core-body, seal with steel plate inner layer steel plate tube upper surface, and pore is opened in the steel plate upper surface, and compressed air enters from the upper surface passage, by discharging between the ectonexine steel plate, form an open loop from following.Compressed air plays the effect of cooling fuse overcoat from ejection between outer layer plate 5 and the inner layer steel plate 6.Compressed-air actuated pressure 0.2～0.8MPa, gas feeding amount 50～400m
3/ min, duration of ventilation are 2～8h.
Hang the coverture 4 that is put in the packaging bag in the die cavity between ingot mould 3 and the inner core-body, before pouring metal melt, coverture 4 is suspended in the ingot mould 3, in the molten metal uphill process, by the molten metal heat coverture packaging bag is melted, coverture is sprinkling upon on the metal bath surface as soon as possible equably, guarantees that the molten metal surface is not oxidized.4～6 bags of coverture packing are suspended from the ingot mould equably, and coverture divides two-layer suspension, and ground floor approaches bottom surface, and the second layer approaches rising head, bottom surface, the release chamber of coverture 300～500mm height.
Embodiment 1
As shown in Figure 1,40 tons of casting of molten metal weight, per 5 tons/minute of poring rate, No. 25 steel of material.
Performance of the present invention is as follows: adopt metal bath surface gas shield technology, steadily fill type Design of Runner System technology, advanced computer modeling technique etc. and carried out technological design, mainly adopted big air quantity cooling technology, the nested core hole creating technology of steel construction, the early stage soverlay technique of molten metal, gas shield beam technology etc.
Advanced computer modeling technique has guaranteed the reasonability of technological design, adopts nested core hole creating technology of steel construction and big air quantity cooling technology, makes steel ingot finish consecutive solidification, and has controlled the segregation position.
In the present embodiment, outer layer plate 15mm is thick, and inner layer steel plate 5mm is thick, and space 15mm between the two-layered steel plates is supported 20 of steel pipes, diameter of steel tube by steel pipe between the steel plate
15mm.
In the present embodiment, compressed-air actuated pressure 0.3MPa, gas feeding amount 100m
3/ min, duration of ventilation are 8h.
The success smoothly of cast for the first time, molten steel rises is steady, does not roll up the gas phenomenon.Overall blowing compressed air 8 hours, the blank that adopts the inventive method to prepare, the large-sized hollow steel ingot of being produced forges into the pipe die forging, and the hollow object of formation does not have excessive defect through flaw detection, meets non-destructive testing standard fully.
As shown in Figure 2, in the process of setting, temperature field simulation result shows: hollow steel ingot ingot body setting time is 4.5h, and the complete setting time of steel ingot is 6h, the hollow steel ingot uniformity of temperature profile, and the steel ingot order of occurrence solidifies, and the own molten metal that helps steel ingot does not contract.
As shown in Figure 3, the shrinkage cavity distribution simulation is the result show: the shrinkage cavity of steel ingot, loose mainly concentrate in the rising head, the size of rising head and the insulation material of selecting for use meet the requirements, loose this consistent better controlled steel ingot defective locations that illustrates with hollow steel ingot blank (Fig. 4) of middle part that mainly is distributed in the steel ingot rising head of steel ingot.
Among the present invention, " steadily filling type Design of Runner System technology " can (publication number: CN1552542A), a kind of no air gap of mentioning steadily fills type cast method for designing and used running gate system referring to the Chinese invention patent application.
Among the present invention, adopt the computer simulation means reasonably to design steel ingot mould, running gate system." computer modeling technique " can be referring to Chinese invention patent application (publication number: a kind of mold filling process of casting analogy method of CN 1388444A) mentioning.And, Chinese invention patent application (publication number: a kind of visible casting method of mentioning CN 1631579A).And, Chinese invention patent application (publication number: a kind of cast steel support roller integral casting method of CN 1597180A) mentioning.
Embodiment 2
As shown in Figure 1,43 tons of casting of molten metal weight, 7 tons/minute of poring rate per minutes, No. 25 steel of material.
Performance of the present invention is as follows: still adopt to adopt metal bath surface gas shield technology, steadily fill type Design of Runner System technology, advanced computer modeling technique etc. and carried out technological design, mainly adopted big air quantity cooling technology, the nested core hole creating technology of steel construction, the early stage soverlay technique of molten metal, gas shield beam technology etc.
In the present embodiment, outer layer plate 25mm is thick, and inner layer steel plate 25mm is thick, and space 60mm between the two-layered steel plates is supported 30 of steel pipes, diameter of steel tube by steel pipe between the steel plate
50mm.
In the present embodiment, compressed-air actuated pressure 0.8MPa, gas feeding amount 400m
3/ min, duration of ventilation are 5h.
The success smoothly of cast for the second time in official hour, has been finished cast.And carried out big air quantity cooling on request, and the large-sized hollow steel ingot of being produced forges into the pipe die forging, and forging is not found excessive defect through flaw detection, meets non-destructive testing standard.
As shown in Figure 1,45 tons of casting of molten metal weight, 6 tons of poring rate per minutes, No. 25 steel of material.
Performance of the present invention is as follows: still adopt metal bath surface gas shield technology, steadily fill type Design of Runner System technology, advanced computer modeling technique etc. and carried out technological design; mainly adopted the nested core hole creating technology of steel construction, big temperature difference cooling technology, narrow gap molding sand technology, made a bet and disperse the cast gate drainage technology, thick large chassis is forced cooling technology etc.
In the present embodiment, outer layer plate 20mm is thick, and inner layer steel plate 10mm is thick, and space 30mm between the two-layered steel plates is supported 6 of steel pipes, diameter of steel tube by steel pipe between the steel plate
30mm.
In the present embodiment, compressed-air actuated pressure 0.5MPa, gas feeding amount 200m
3/ min, duration of ventilation are 6h.
The success smoothly of cast for the third time in official hour, has been finished a whole set of cast task.The large-sized hollow steel ingot of being produced forges into hollow steel ingot, does not find excessive defect after flaw detection, meets non-destructive testing standard.The riser feeding ability that steel ingot is described has reached designing requirement, does not have big shrinkage cavity, rarefaction defect.
The course of work of the present invention and result:
Utilize the present invention in the casting process of large-sized hollow steel ingot, adopted big air quantity cooling technology, the nested core hole creating technology of steel construction, effectively controlled segregation, the segregated zone of steel ingot is mediated.Utilize the early stage soverlay technique of molten metal, gas shield beam technology; thick large chassis is forced cooling technology etc., has finished the cast of large-sized hollow steel ingot, has guaranteed solidifying of steel ingot; reduced oxide inclusion, make steel ingot performance, composition, organize and all reached designing requirement.Result of detection proves, large-sized hollow steel ingot does not exceed standard and defective such as is mingled with.The forging that utilizes hollow steel ingot to forge has reached national standard, finds that through using the forging serviceability is good.
Comparative example
Traditional hollow steel ingot casting technique: sprue adopts the steel pipe brick, and diameter is identical up and down, adopts right angle transition, two of cross gates, equal diameters at sprue and cross gate junction.The fuse design is unreasonable, is unfavorable for that the heat transmission causes the compressed air intensity of cooling not enough, tangible segregated zone occurs.
The shortcoming of this design is: (1) running gate system can not be full of; molten metal flows in running channel very big remaining space, is easy to cause volume gas and is mingled with, and does not have strict the employing to water the beam resist technology; the steel ingot field trash is exceeded standard, can not carry out the forging of high-accuracy forging.(2) the inner core intensity of cooling is not enough, and ingotism is obvious, and segregation appears at the inboard subsurface of steel ingot, appears at the forging inner surface through forging segregated zone, influences the use of steel ingot.(3) steel ingot inner core-body intensity of cooling is not enough, and the inner core-body temperature raises, and intensity descends, and inner core-body outer layer plate gross distortion does not take out inner core-body smoothly.
Claims (9)
1, a kind of manufacture method of low-aliquation large-scale hollow steel ingot, it is characterized in that: adopt the nested core hole creating technology of steel construction, adopt two-layered steel plates formation hollow steel ingot nested against one another inner core-body, ectonexine steel plate cylinder is two concentric drums that differ in size, inner layer steel plate is embedded among the outer layer plate, gapped between the steel plate, support with steel pipe between the steel plate, in the cast and process of setting of steel ingot, inner core-body is in the steel ingot center, form the steel ingot centre bore, the die cavity between ingot mould and the inner core-body forms hollow steel ingot.
2, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 1, it is characterized in that: outer layer plate 5～25mm is thick, and inner layer steel plate 5～25mm is thick, space 5～60mm between the two-layered steel plates, support 4～60 of steel pipes, diameter of steel tube 5～50mm between the steel plate by steel pipe.
3, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 1, it is characterized in that: adopt big air quantity cooling technology, adopt compressed air to carry out air cooling, compressed air enters in the middle of inner core-body, between outer layer plate and inner layer steel plate, spray, play the effect of cooling fuse overcoat.
4, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 3, it is characterized in that: compressed-air actuated pressure 0.2～0.8MPa, gas feeding amount 50～400m
3/ min, duration of ventilation are 2～8h.
5, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 1, it is characterized in that: adopt the early stage soverlay technique of molten metal, before pouring metal melt, coverture is suspended in the ingot mould, in the molten metal uphill process, with coverture packaging bag fusing, coverture is sprinkling upon on the metal bath surface by the molten metal heat as soon as possible equably, prevents the molten metal surface oxidation.
6, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 5, it is characterized in that: 4～6 bags of coverture packing are suspended from the ingot mould bottom surface, the release chamber of coverture 300～500mm height equably.
7, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 5, it is characterized in that: coverture divides two-layer suspension, and ground floor approaches bottom surface, and the second layer approaches rising head, when molten metal entered die cavity, the coverture first-selection played a protective role; When molten metal continued to rise, surface dopant constantly moved downward along the ingot mould inwall with molten metal, and the top layer coverture is consumed gradually, and at this moment the molten steel heat falls the upper strata coverture, continues to prevent molten steel oxidation.
8, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 1, it is characterized in that: adopt gas shield beam technology, with an annular gas protective cover, pore is opened in gas shield cover inboard, the outside links to each other with source of the gas, in casting process, metal liquid stream is flow through from the annulus cover center of annular gas protective cover; Inert gas feeds the side entrance outside the annulus cover, is blown out by a plurality of outlets in inboard, forms the gas shield layer around molten steel stream, just reaches the protection metal liquid stream, the effect of anti-oxidation.
9, according to the manufacture method of the described low-aliquation large-scale hollow steel ingot of claim 8, it is characterized in that: before the cast beginning, the gas shield cover is placed on the cup, makes the gas shield cover concentric with the cast gate of casting ladle.
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| CNA2008100115368A CN101293273A (en) | 2008-05-23 | 2008-05-23 | Process for manufacturing low-aliquation large-scale hollow steel ingot |
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|---|---|---|---|
| CNA2008100115368A CN101293273A (en) | 2008-05-23 | 2008-05-23 | Process for manufacturing low-aliquation large-scale hollow steel ingot |
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| CN101293273A true CN101293273A (en) | 2008-10-29 |
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