CN101927336A - Large-scale extra-thick plate blank and production method thereof - Google Patents
Large-scale extra-thick plate blank and production method thereof Download PDFInfo
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Abstract
The invention discloses a large-scale extra-thick slab and a production method thereof, wherein the extra-thick slab is composed of 2 or more than 2 continuous casting slabs and molten steel solidification composite layers poured between the continuous casting slabs. The production method comprises the steps of forming a metal mold cavity by 2 or more continuous casting billets and two metal thin strips continuously fed from the side edges of the continuous casting billets, and pouring molten steel of the same steel type or different steel types into the mold cavity to realize vertical filling of the metal mold cavity. The thickness of the casting blank can reach 600-1300 mm, the maximum unit weight can reach more than 100t, the casting blank has the advantages of large unit weight and large compression ratio of the extra-thick plate produced by the die-cast steel ingot, and has the advantages of fine structure, good internal quality, high production efficiency, high yield and the like of the extra-thick plate produced by the continuous casting blank. In addition, the chemical components of the composite layer are finely adjusted, so that the thickness effect of the steel plate is reduced, and the performance uniformity of the super-thick steel plate is improved. And special composite steel plates can be produced by adopting different steel types for compounding.
Description
Technical field
The invention belongs to casting field, particularly a kind of large extra thick plate blank and production method thereof.
Background technology
The Wide and Thick Slab product is widely used in the various fields of national economy such as transportation pipe line, boats and ships, bridge, container, boiler, ocean member, building.Along with the develop rapidly of modern industry, pressure vessel, boiler, drilling platforms and all kinds of naval vessel demand with plate is increased year by year, for reducing the manufacturing cost of various devices, these devices all trend towards maximizing; For improving the security reliability of large-scale plant, the plate quality that uses is required more and more stricter.The demand of making the big substance that these large-scale plants must use (surpassing 20t), special thick (greater than 100mm) steel plate is also increasing.The thickest reaching more than the 300mm, the wideest 5350mm that reaches, finished product substance maximum can reach more than the 80t, and requires anti-lamellar tearing Z to reach Z25, other level of Z35 level to performance.
In Heavy Plate Production, compression ratio is an important indicator weighing product quality.The quality of raw material inherent quality is very big to the influence of compression ratio, if raw material interior tissue even compact, defectives such as unloose, shrinkage cavity, then compression ratio can suitably reduce.When being raw material with the steel ingot, produce the general steel plate that requires, should make compression ratio η＞6, during the premium quality product of production important use, require bigger compression ratio, should make η＞10; When being raw material, produce the general steel plate that requires, should make η＞3, during the product of production important use, should make η＞5 with the continuous casting billet.
Along with the development of modern times smelting and continuous casting technology, the internal soundness of continuous casting billet is more and more higher, and compression ratio can suitably reduce.As 1996, Japan Nagoya factory of company of Nippon Steel builds up the novel casting machine that has die casting and continuous casting advantage concurrently, solidify by vertical casting and control, reduce non-metallic inclusion and segregation, the slab quality of producing is good, the thickest 200mm that reaches of high-quality ultra-thick steel plates that produces, the thickest 330mm that reaches of low-carbon (LC) ultra-thick steel plates.Use this conticaster can guarantee that the compression ratio of 200mm ultra-thick steel plates is 2.
With the S420M steel is example: this steel grade requirement greater than 35%, can be produced 80mm following slab with the thick slab of 300mm in the thickness direction contraction percentage of area, satisfies above requirement.Surpass the thick slab of 80mm, can only produce with static ingot in the past.
For special heavy plate, more than 100mm, if guarantee compression ratio η＞5, then the minimum thickness of continuous casting billet is wanted more than the 500mm as if finished product thickness.If when being raw material with the casting steel ingot, during the premium quality product of production important use, the minimum thickness of steel ingot should be more than 1000mm.
Slab is thick more, and continuous casting steel billet solidifies fully and takes time longly more, and it is also long more to solidify liquid core length, so continuous casting production is subjected to the restriction of technical conditions, can't produce the excessive special heavy plate of thickness.The Di Lingen Thick Plate Plant of the later stage nineties in last century operation, the maximum slab thickness of Nagoya Thick Plate Plant novel vertical conticaster reach 400mm, and this thickness is the thickest in the world continuous casting steel billet.The thickness specification of the domestic high-quality continuous casting steel billet that can produce in enormous quantities is 320mm to the maximum, common thickness 230,300mm, the general 800～2300mm of width specifications at present.
The basic characteristics that large-scale static ingot solidifies are carried out to the center from sidewall, consolidated structure is followed successively by tiny equiax crystal district from outside to inside, columnar zone and equiax crystal district, shrinkage cavity is arranged at top, the bottom is the deposition pyrometric cone, steel ingot inside also exists micropipe, reverse V-shaped segregation and V-type segregation are present in column crystal and equiax crystal interface and equiax crystal district successively, in steel ingot, also there is the center segregation phenomenon, there are secondary pipe and center porosity more, field trash also is difficult for come-up, is therefore solidified the restriction of characteristics, produce high-quality special heavy plate, has only the substance and the thickness that increase steel ingot, adopt the rolling next broken thick column crystal of big compression ratio, crystal grain thinning reduces the influence of internal flaw, but substance is big more, and the frequency that its defective produces is also just high more.Large-scale steel ingot is produced special heavy plate crop end rate up to 16%～20%, and lumber recovery is low, and generally only about 75%, the production cost height, production efficiency is low, and internal soundness is poor, can not adapt to the needs of modern industry high speed development.
The unidirectional solidification technology is a die casting technology of producing extra-thick plate blank that grows up the eighties in last century, being fit to strand maximizes, and can eliminate or reduce the loose and segregation of steel ingot inside, and improve the uniformity of steel ingot body, reach the purpose that improves end product quality.Force under the cooling condition in the bottom, steel ingot thickness can reach 900～1200mm, so just can satisfy the quality and the thickness requirement of 150～300mm special heavy plate.Be 200820056366.0 at the Baosteel application number, name is called in " a kind of extra-thick plate blank coagulation system " patent, a kind of extra-thick plate blank coagulation system is provided, make solidifying of extra-thick plate blank reach the requirement of unidirectional solidification, super-huge casting mold has guaranteed the thickness specification 300～800mm of extra-thick plate blank, and the heavy maximum of ingot can reach 80t.Unidirectional solidification all concentrates on the head of steel ingot with field trash and segregation thing, needs after solidifying the head segregated zone is removed, and processing capacity is big, and the prosperity of steel ingot columnar grain, and is very unfavorable to improving special heavy plate impact flexibility.
Japan JFE has developed special steel Heavy Plate Production technology, has several patents all to propose with welding method two blocks of above continuous casting steel billets to be made the method that a composite plate blanks is rolled then, compression ratio less than 2.0 condition under, produce super-thick steel plate.At the special permission publication number is that 2006-000856, name are called in the patent of " METHOD FOR MANUFACTURING EXTREMELY THICK STEEL PLATE ", produce the above special heavy plate problem of thickness 200mm for solving compression ratio less than 2, with welding method the continuous casting steel billet more than two is produced composite plate blanks, JFE iron company utilizes the big specification electron beam welding device of introducing (EBW) to develop high vacuum, high speed slab combination bonding technology, has reached the close-burning purpose of raising clad steel plate after the use.The casting skin face of removing slab is ground on the composition surface that continuous casting steel billet is relative with amary tape grinding machine; the about 2mm of grinding thickness is placed in the vacuum chamber after slab stacked, and the air between the slab interface is pressed less than 1Pa; with electron beam welding or inert gas-shielded arc welding, sealing around the slab is welded.If between mother metal and clad material, still there is air, in heating process, can form iron scale on the material surface so, the adhesive property of steel plate is worsened.Adopt EBW equipment, the slab of stacking is packed in the big vacuum chamber, finally carries out electron beam welding around material.Vavuum pump is not only taken the air in the slab of stacking away, and creates a vacuum atmosphere.Therefore, adopt EBW can improve bonding efficiency and also can realize large-scale production.
By using above-mentioned production technology, the steady production that JFE iron company has realized clad steel plate has shortened the production time.Therefore, a kind of continuous casting steel billet that utilizes of JFE iron company exploitation is produced thickness above 240mm super large special heavy plate production technology, has promptly used compound Heavy Plate Production technology.In this technology, a super large special heavy plate is made with two blocks of identical steel grade continuous casting steel billets, and it at first will be handled the surface that the two boards base will bond, then by EBW electron beam welding combination, finally by low speed, heavy reduction rolling bonding.At present, thickness has utilized continuous casting steel billet to carry out testing rolling above the special heavy plate of 270mm and 360mm.Verified, the special heavy plate thickness that can utilize this technology to produce can be up to 360mm.
High-quality steel billet welding is carried out in this specification requirement under high vacuum compound, and the composition surface that continuous casting steel billet is relative requires to need high fineness and glacing flatness with the amary tape grinding machine grinding, needs pumped vacuum systems highly reliably.The slight flaws of weld seam all has the possibility that steel plate is scrapped.In addition, oxidation in heating process and the inhomogeneous deformation in the operation of rolling also have the possibility that causes compound failure, operation easier height.
Summary of the invention
In order to overcome the deficiencies in the prior art, the objective of the invention is to continuous casting technology and die casting technology are combined, a kind of large extra thick plate blank and production method thereof are provided, both had static ingot and produced the big substance of special heavy plate, big compression ratio advantage, the while has continuous casting billet production structure refinement that special heavy plate had again, internal soundness is good, production efficiency is high, the lumber recovery advantages of higher.
Another object of the present invention is to provide a kind of large extra thick plate blank and production method thereof, by the fine setting chemical components of composite layer, can reach the purpose that reduces the steel plate thickness effect, improves the super-thick steel plate performance uniformity.
A further object of the present invention is to provide a kind of large extra thick plate blank and production method thereof, adopts the xenogenesis steel grade compound, the purpose that realizes producing special clad steel plate.
The present invention relates to a kind of large extra thick plate blank, constituted by the continuous casting billet more than 2 or 2 and the same steel grade of pouring into a mould between it or different steel grade molten steel solidification composite bed.
The present invention adopts the method for the compound production of common continuous casting billet; the high-quality continuous casting billet of being produced with existing continuous casting installation for casting is a raw material; by technologies such as bead, pickling continuous casting billet is carried out surface treatment; remove the iron scale on continuous casting billet surface; and contain the coating of thermite and slag former at surface bonding one deck; two metal strips of per 2 or 2 blocks of above continuous casting billets and side continuous feed thereof constitute the metal mold die cavitys; under protective atmosphere; cast realizes the vertical filling of metal mold die cavity continuously with the molten steel of steel grade or different steel grade in die cavity.The molten steel solidification feeding that is positioned at lower mold cavity is finished by the also not solidified molten steel filling of a last die cavity.
Realize that the present invention takes following technical measures on production technology:
The efficient surface treatment of 1 compound preceding continuous casting billet
For the compound continuous casting billet surface of needs, by technologies such as bead, blasting treatments continuous casting billet is carried out surface treatment, remove the iron scale on continuous casting billet surface.If require height, also can adopt acid cleaning process to remove.Require to contain in the pour steel enough strong deoxidant elements such as Al etc. simultaneously.
It is compound to adopt this method to carry out continuous casting billet, to the iron scale of composite surface remove require not high, as long as the thicker Fe in surface
3O
4Remove and get final product, even the FeO of iron scale internal layer has a little residual, because the casting liquid steel temperature is higher than the FeO fusing point, in casting cycle, this partial oxidation iron sheet fusing reacts with strong deoxidant element or thermite described below in the steel, and product rises in the top with liquid level, can excise at last, can not residue in inside steel billet influences billet quality.
In order to prevent after the surface treatment oxidation once more of billet surface to the casting cycle; to bond to the billet surface after the surface treatment and to cover the coating that one deck contains thermite and slag former; prevent the oxidation on continuous casting billet surface in the casting process; the performance of this coating can guarantee fusing or decomposition when casting; form low-melting slag system; come-up is got rid of with covering slag rapidly.This coating contains thermite, has the self-propagating reaction feature, forms high temperature on the continuous casting billet surface during reaction, and the appearance of chill when preventing to cast helps floating foreign in the molten steel, purifies steel.The combustion wave speed of general thermite self-propagating reaction can reach 1～150mm/s, and the reaction adiabatic temperature can reach 2000～4000 ℃.By the composition proportion of control coating, the combustion wave speed of self-propagating reaction and the speed of casting liquid level rising are complementary, be beneficial to the field trash and the air holes that reduce in the steel.
It is compound to adopt this method to carry out continuous casting billet, requires also not strict to clean level, surface smoothness and the glacing flatness of the removal iron scale of composite surface.Defective such as some top layer micro-cracks of casting billet surface even can melt seam in casting cycle.
2 die cavity both sides adopt thin steel band of low-carbon (LC) or refractory metal and alloy band to carry out side seal
For preventing that molten steel from leaking, the metal tape of continuous feed is pressed on continuous casting billet side and moulding, need the format roll group in the strand both sides, the shape after metal tape width and the moulding will guarantee to compensate the mismachining tolerance of continuous casting billet and sealing gasket length direction.Metal tape thickness 0.5mm～2.0mm, metal tape fusing point preferably are higher than 20～100 ℃ of fusing points pouring into a mould steel grade.Metal tape can adopt refractory metal and alloy band such as W, Mo, Cr, Nb, Ta and alloy thereof etc., and the surface is coated with one deck and prevents the coating that bonds, realizes recycling.Also can disposable use low carbon mild steel steel band.
3 compound before continuous casting billets carry out utilizing its waste heat to cast after preheating or continuous casting billet roll off the production line
Continuous casting billet carries out suitable preheating, and the casting bond effect is better.Purpose is to combine with the exothermic reaction of coating, the casting composite surface of continuous casting billet is heated to uniform temperature, at high temperature casts, the atom combination is very firm between the composition metal, original crack defect that simultaneously can seam continuous casting billet surface improves the metal composite quality.Can also reduce chill, steel inclusion is fully floated, improve the metallurgical quality of composite bed.Interval 100 ℃～600 ℃ the bests of initial stage preheat temperature, stable back can reach effect same by the molten steel heat loss through radiation.Even but top layer thermit reaction and molten steel radiation that not preheating only relies in the casting cycle also can realize good compound purpose.
The steel grade of, poor thermal conductivity poor for low thermophase plasticity as the continuous casting billet of middle and high carbon steel or high-alloy steel etc., requires preheat temperature higher as 400～600 ℃, to prevent the excessive steel billet cracking that causes of thermal stress in casting cycle.
By the control rhythm of production, utilize continuous casting billet itself waste heat of back that rolls off the production line, with surface coating drying and cast, not only can reduce the generation of casting cycle hydrogen, improve slab quality, and energy savings more.
4 continuous casting recombination processes adopt inert gas shielding or low melting point covering slag to protect casting
The per continuous casting billet and metal strip of side continuous feed thereof more than 2 or 2 constitutes a metal mold die cavity, is full of inert gases such as argon gas or He, Ne, Kr, Xe, N in this die cavity space in the casting cycle, prevents the secondary oxidation of molten steel.Perhaps, adopt dissimilar low melting point continuous casting covering slags to protect casting, adsorb steel inclusion, and prevent the secondary oxidation of molten steel according to the steel grade difference.
5 in casting process, adopts water or other medium to forcing cooling around the strand
In casting process, to adopt media such as water, water smoke, aerosol or gas that strand and metal tape are forced cooling around the strand, with the control liquid core length, reduce device height, and guarantee carrying out smoothly of casting process.Especially the water yield of metal tape one side wants enough big, makes the molten steel accelerated solidification of infiltrating in the slit, to prevent the leakage of molten steel.The specific water controls according to 0.5～2L/kg.The molten steel casting degree of superheat is controlled at below 30 ℃.
6 compound die cavity width are that composite bed thickness is controlled at 50mm～200mm
From improving the angle of special heavy plate compression ratio, composite bed thickness is thick more good more, and the come-up to steel inclusion is favourable simultaneously.But composite bed thickness is too big, causes metallurgical length to increase, and equipment investment is strengthened, and continuous casting billet structure is thick simultaneously, influences plate property.If but composite bed thickness is too little, steel inclusion has little time come-up, influences the performance of steel grade, and the size of sprue gate is restricted simultaneously, is difficult to processing and installation.General control composite bed thickness is between 50mm～200mm.
7 continuous casting recombination processes adopt the liquid core to depress or the compound strand internal soundness of the rolling raising of liquid-solid phase
In the casting machine bottom a pair roller is set, be similar to a powerful milling train, strand is implemented to force to depress, because the composite bed part of the inner casting of strand is in liquid core state at this moment, resistance of deformation is low, deform easily, and original continuous casting billet portion temperature is low, the resistance of deformation height, be not easy to take place plastic deformation, like this, the inhomogeneous plastic compression deformation of thickness direction takes place in strand by roll the time, the casting part is subjected to bigger compression because of temperature is high, impel its core under HTHP, to realize seam, can alleviate the segregation at strand center significantly, significantly improve the loose of strand center simultaneously and make the center grain refinement, improve the compound quality of strand, energy savings.This effect to the central inner quality improvement is better than after the strand cooling heating again and depresses rolling effect greatly, and is especially more favourable for special heavy plate production.Must determine the size of depressing position and drafts according to parameters such as casting rate, steel grade, intensity of cooling, molten steel overheats.Perhaps set level after solidifying cutting fully, it is rolling to carry out depressing of certain deflection on the horizontal duo mill (being similar to blooming mill) of special use, by means of inhomogeneous deformation, makes the compacting of internal high temperature part, seam.
Compress variation is the bigger the better, and generally makes the composite bed distortion reach 10%～30% of its thickness and gets final product.
Sealing gasket will be placed in 8 contact positions of respectively organizing between the die cavity, and molten steel is from the clearance leakage between the continuous casting billet up and down when preventing to cast
Sealing gasket will adopt mild steel steel band manufacturing as thin as a wafer, make semiclosed cavity with good processability, filling is carried out with shape adaptability and the good material of flame cutting performance in the centre, material as similar forms such as wood chip, rice husk, iron filings and character, so that certain distortion takes place under the gravity effect of continuous casting billet, be adjacent to the continuous casting billet contact surface, play sealing function.A side of complete closed can not be provided with some steam vents outwardly, is convenient to exhaust.Do not need to place sealing gasket under the continuous casting billet that three base compound tenses mediate.
Slab thickness of the present invention can reach 600～1300mm, maximum substance reaches more than the 100t, can be used for the production of specific use special heavy plates such as high power turbine generating set, offshore platform, boats and ships, bridge, warship, tank armor plate, atomic power station, large mold steel, building structure, boiler and pressure vessel, both had static ingot and produced the big substance of special heavy plate, big compression ratio advantage, the while has continuous casting billet production structure refinement that special heavy plate had again, internal soundness is good, production efficiency is high, the lumber recovery advantages of higher.In addition, in recombination process,, reduce the steel plate thickness effect, improve the super-thick steel plate performance uniformity by the fine setting chemical components of composite layer.Also can adopt the xenogenesis steel grade compound, produce special clad steel plate.
Description of drawings
Fig. 1 is this bright extra-thick plate blank casting principle schematic;
Fig. 2 is the structural representation of the present invention's three base compound tenses casting die cavity;
Fig. 3 is the structural representation of sealing gasket of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 1, by continuous casting billet 1 and 2 and the metal mold cavity that 6. constitutes of the metal strip of side continuous feed, be similar to continuous cast mold, the difference of itself and continuous cast mold is that its carrying out along with the molten steel stowing operation moves downward vertically but not vibrate with certain frequency.6. the metal strip of continuous feed is equivalent to the initial solidification shell that forms, and in cooling procedure, molten steel constantly solidifies thereon, and shell thickness is increased gradually.Adopt around in the strand folding process water or other medium 5. continuous casting billet to be forced cooling, be equivalent to the two cold of continuous casting.By control poring rate, the type of cooling and vertical translational speed, control rational metallurgical length, guarantee in 2～3 groups of strand altitude ranges, to realize solidifying fully, so that the control appliance overall height.Schematic illustration for 1., 2., 3. three groups in casting, wherein 1. group is cast, 2. group is solidified, 3. group is solidified to finish and can be cut disconnection, 4. is the sealing gasket between group and the group, molten steel leakage when preventing to cast.But actual production is not limited to three groups, specifically organizes number and will determine flexibly according to factor such as steel grade, continuous casting billet size and setting rate.
Liquid core according to inside solidifies the position, can suitably highly set up pinch roll to force to depress with press function, be similar to the light press function of continuous casting, perhaps 90 ° on transposition after cutting, it is rolling to carry out depressing of certain deflection on the horizontal duo mill (being similar to blooming mill) of special use, by means of inhomogeneous deformation, make the compacting of internal high temperature part, seam.
Crystallization process in parallel plate type cut deal blank continuous casting crystallizer, molten steel solidification process steadily and evenly with the control metallurgical length, are realized the die cavity filling of 50～200mm thickness by control poring rate, the type of cooling and vertical translational speed.8. running gate system comprises ladle, sprue gate etc.In order to extend into from the continuous casting billet side in the cast die cavity, sprue gate is different with general continous casting sprue, can adopt forms such as straight curved formula, arc, combined type.If it is compound to adopt 3 blocks of continuous casting billets to carry out, then need two cover running gate systems two parts of die cavity to be carried out while pouring filling (Fig. 2) respectively from the one or both sides of casting machine.7. the format roll group has chilling action, metal strip is pressed on continuous casting billet side and moulding to be leaked to prevent molten steel, also can adopt Quench pieces such as known chain-type, crawler type, these roller or chain tubercle pieces with chilling action are formed by heat conductivility good copper or its alloy manufacturing, wherein cool off by cooling water.Shape after metal strip width and the moulding will guarantee to compensate the mismachining tolerance (Fig. 2) of continuous casting billet and sealing gasket length direction.Reveal for good seal prevents molten steel, will place sealing gasket, also can adopt asbestos sliver (cloth), mould assembling mud bar etc. to seal in the contact position that continuous casting billet is respectively organized between the die cavity.Continuous casting billet both sides and metal strip contact position also can seal like this.
Why running gate system is carried out pouring filling from the one or both sides of strand to die cavity rather than is poured into a mould from the crystallizer top as common conticaster, is the handling of continuous casting billet when organizing die cavity assembling for the ease of each.Certainly, compound iff using 2 blocks of continuous casting billets to carry out, also can as common conticaster, pour into a mould, but need long sprue gate from the crystallizer top, need adopt special handling and clamping and conveying device when continuous casting billet is respectively organized the die cavity assembling simultaneously.
Water on last inferior piece continuous casting billet die cavity at one, but the corresponding hot top of design and installation waters the internal soundness of time last piece steel billet to guarantee one.The hot top design can adopt known knowledge to carry out.
This method also can be carried out single-piece production except producing continuously, this moment is identical with die casting, and each base needs a hot top.But hot top is more much smaller than the hot top of equivalent weight steel ingot.
As to adopt the specification of continuous casting billet be 300 * 2300 * 5200mm, supposes die cavity filling thickness 150mm, adopts thin thickness of strips 2mm, and width is greater than compound base thickness 50mm.
If two of employings are compound:
Composite continuous casting base thickness 2 * 300+150=750mm
Composite continuous casting base weight 750 * 2300 * 5200 * 7.85 * 10
-9=70.39 (t);
Consume thin steel band 2 * (750+50) * 2300 * 2 * 7.85 * 10
-9=0.058 (t)
If three of employings are compound:
Composite continuous casting base thickness 3 * 300+2 * 150=1200mm
Composite continuous casting base weight 1200 * 2300 * 5200 * 7.85 * 10
-9=112.69 (t).
Consume thin steel band 2 * (1200+50) * 2300 * 2 * 7.85 * 10
-9=0.090 (t)
The ratio that consumes the thin shared steel billet weight of steel band is 0.08%.
If the production experience of the slab rolling special heavy plate that the novel casting machine that has die casting and continuous casting advantage concurrently that builds up according to Nagoya factory of company of Japanese Nippon Steel is produced, the compression ratio of production high-quality ultra-thick steel plates is 2 can meet the demands then producible maximum steel plate thickness 600mm.
If adopt the high-quality continuous casting steel billet with reference to JFE company, by the technology of forgings-rolling mill practice manufacturing super-thick steel plate, the compression ratio of production high-quality ultra-thick steel plates is 1.25 can meet the demands then producible maximum steel plate thickness 960mm.
Claims (9)
1. large extra thick plate blank is characterized in that: be made of continuous casting billet more than 2 or 2 and the molten steel solidification composite bed poured into a mould between it.
2. a production method that is used for the described large extra thick plate blank of claim 1 is characterized in that: with the metal tape formation metal mold die cavity of continuous casting billet more than 2 or 2 and side continuous feed thereof, pour steel in die cavity.
3. the production method of large extra thick plate blank according to claim 2 is characterized in that before constructing the metal mold die cavity the compound continuous casting billet of needs being carried out surface treatment, and the continuous casting billet surface bonding one deck after the processing contains the coating of thermite and slag former.
4. the production method of large extra thick plate blank according to claim 2 is characterized in that according to the steel grade difference, before the casting continuous casting billet is preheating to uniform temperature, or the waste heat after utilizing continuous casting billet to roll off the production line casts, and preheat temperature is controlled at 100 ℃～600 ℃.
5. the production method of large extra thick plate blank according to claim 2 is characterized in that adopting in casting process media such as water, water smoke, aerosol or gas that strand and metal tape are forced cooling, and the molten steel casting degree of superheat is controlled at below 30 ℃.
6. the production method of large extra thick plate blank according to claim 2 is characterized in that casting cycle adopts inert gas shielding casting such as Ar or He, Ne, Kr, Xe, or adopts covering slag protection casting.
7. the production method of large extra thick plate blank according to claim 2, it is characterized in that compound die cavity width is that composite bed thickness is controlled at 50mm～200mm, the continuous casting recombination process is implemented to force to depress to strand, and compress variation makes the composite bed distortion reach 10%～30% of its thickness.
8. the production method of large extra thick plate blank according to claim 2, sealing gasket will be placed in the contact position that it is characterized in that constituting between the continuous casting billet of respectively organizing die cavity, sealing gasket adopts mild steel steel band manufacturing as thin as a wafer, make the semiclosed cavity with good processability, filling is carried out with shape adaptability and the good material of flame cutting performance in the centre.
9. the production method of large extra thick plate blank according to claim 2, it is characterized in that in strand both sides employing forming strap roller group, the width of metal tape and the shape after the moulding will guarantee to compensate the mismachining tolerance of continuous casting billet and sealing gasket length direction, perhaps adopt chain-type Quench piece that metal tape is compressed, format roll group or Quench piece adopt good Cu and the alloy thereof of thermal conductivity to make.
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| CN108220564A (en) * | 2017-02-16 | 2018-06-29 | 中国科学院金属研究所 | A kind of 9Ni heavy forgings construct molding design method |
| CN108655370A (en) * | 2018-05-17 | 2018-10-16 | 辽宁科技大学 | A kind of composite plate blanks casting method and device |
| CN109719130A (en) * | 2017-10-31 | 2019-05-07 | 湖南三泰新材料股份有限公司 | A kind of compound extra-thick plate blank and its production method |
| CN111318676A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | High-speed steel die casting covering slag and preparation method thereof |
| CN111331104A (en) * | 2020-03-20 | 2020-06-26 | 辽宁科技大学 | Preparation method of fine-grain homogeneous compact large-scale metal plate blank or plate |
| CN111842749A (en) * | 2020-07-13 | 2020-10-30 | 中国船舶工业集团公司第七0八研究所 | Manufacturing method of universal marine steel structure |
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