CN102161080A - Manufacturing tool of high-compact wide and thick plate blank for wide and thick plate rolling mill and method - Google Patents
Manufacturing tool of high-compact wide and thick plate blank for wide and thick plate rolling mill and method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
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- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 42
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- 239000010410 layer Substances 0.000 claims description 29
- 229910052786 argon Inorganic materials 0.000 claims description 21
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Abstract
The invention relates to the field of manufacturing field of a wide and thick plate blank for a wide and thick plate rolling mill, in particular to a manufacturing tool of a high-compact wide and thick plate blank for the wide and thick plate rolling mill, solving the problems of oxidation with impurities, hole shrinkage, looseness, cracks and the like of the plate blank. The manufacturing tooling is provided with a heat-insulating riser, moving dies, water cooling inner sleeves, a long water gap, hydraulic cylinders, a water cooling chassis and a hydraulic power system providing the external force; all the moving dies are combined on the water cooling chassis by utilizing the external force, and the heat-insulating risers are arranged at the upper parts of the moving dies; simultaneously, the long water gap is preheated, and before casting, the long water gap is arranged at the center of a cavity to wait for casting; in the casting process, the long water gap and a ladle steel outlet are butted, a ladle is opened, and molten steel enters the cavity from the long water gap; molten metal is solidified in a water cooling mold, the hydraulic system is adopted to provide external force, so as to lead the plate blank to be crystallized under the pressure action; after the solidification is finished, boxing and riser cutting are carried out on the wide and thick plate blank under the high-temperature state; and finally, the wide and thick plate blank is placed in a heat treatment furnace for annealing treatment.
Description
Technical field
The present invention relates to wide and heavy plate mill and make the field, the specifically a kind of wide and heavy plate mill manufacturing frock and method of high fine and close generous slab with generous slab.
Background technology
Wide and Thick Slab is widely used in China's economic construction, on large ship, ocean platform, Hydropower Unit, fired power generating unit and long-distance pipeline, all uses Wide and Thick Slab in a large number.China is in the recent period newly-built tens of Wide and Thick Slab steel rolling production-lines comprise Anshan iron and steel plant 5000mm, 5500mm milling train, Baosteel 5000mm milling train etc., more than 2,000 ten thousand tons of newly-increased production capacities.
Generally, the applied environment of Wide and Thick Slab is more abominable, requires Wide and Thick Slab to have higher intensity and performance uniformity, and the key of decision Wide and Heavy Plates performance is generous slab.Have only generous slab thickness enough big, generous slab thickness reaches 5: 1 with finished steel plate thickness ratio, just can make steel plate in the operation of rolling, obtain enough forging ratios, carry out crystallization fully again, crystal grain obtains abundant refinement, and the slab casting defective obtains healing, thereby the assurance plate property satisfies the flaw detection requirement.
The source of present generous slab mainly contains continuous casting billet, static ingot and electroslag remelting steel ingot.The continuous casting billet maximum ga(u)ge that the continuous casting mode is poured into a mould generally is no more than 350mm.Owing to be subjected to the restriction of forging ratio, use the rolling steel plate of continuous casting billet, general thickness is no more than 100mm, otherwise plate property just can not get guaranteeing.Static ingot must pass through the hydraulic press cogging, just can obtain generous slab, and the expense of hydraulic press cogging has increased the manufacturing cost of slab by a relatively large margin more than 3000 yuan/ton.Electroslag remelting steel ingot can prepare the generous slab of high-quality, and still, slab of electroslag remelting approximately needs 30 hours, and efficient is very low, and melting expense height.
Summary of the invention
The object of the present invention is to provide a kind of wide and heavy plate mill manufacturing frock and method, solved problems such as slab oxide inclusion, shrinkage cavity, loose, crackle with high fine and close generous slab.
Technical scheme of the present invention is:
The hydraulic power system that a kind of wide and heavy plate mill manufacturing frock of high fine and close generous slab, this worker are equiped with insulated feeder, dynamic model, the interior cover of water-cooled, long nozzle, hydraulic cylinder, water-cooled chassis and external force is provided, concrete structure is as follows:
Four sides split all around on the water-cooled chassis is provided with dynamic model, and the water-cooled chassis that the dynamic model of four sides setting all around and bottom are provided with forms combined type water-cooled mould; The top of this combined type water-cooled mould is provided with insulated feeder, long nozzle reaches in the die cavity of combined type water-cooled mould from the top of combined type water-cooled mould, the dynamic model inboard of four sides setting all around is provided with cover in the water-cooled, the dynamic model arranged outside hydraulic cylinder of four sides setting all around, all around dynamic model supports by hydraulic cylinder, and hydraulic cylinder connects hydraulic power system.
The described wide and heavy plate mill manufacturing frock of high fine and close generous slab, dynamic model is provided with water-cooling system, the water-cooling system of dynamic model is provided with the dynamic model outlet pipe, the dynamic model supporting back board, the dynamic model water inlet pipe, the dynamic model collect cavity, cover in the dynamic model water-cooled, the dynamic model water-cooling channel, the dynamic model walking mechanism, dynamic model supporting back board inboard is provided with cover in the dynamic model water-cooled, the one side of cover is corresponding with generous slab in the dynamic model water-cooled, the another side of cover is connected to dynamic model collect cavity in the dynamic model supporting back board by the dynamic model water-cooling channel in the dynamic model water-cooled, be connected with dynamic model outlet pipe and dynamic model water inlet pipe on the dynamic model collect cavity, the dynamic model walking mechanism is installed in dynamic model supporting back board bottom.
The described wide and heavy plate mill manufacturing frock of high fine and close generous slab, water-cooled chassis is provided with water-cooling system, the water-cooling system of water-cooled chassis is provided with cover in chassis water inlet pipe, the chassis water-cooled, chassis water-cooling channel, chassis connecting bolt, chassis outlet pipe, chassis alignment pin, chassis support base plate, chassis collect cavity, the chassis is supported the base plate top cover in the water-cooled of chassis is set, and the chassis is supported the base plate bottom chassis alignment pin is set; The one side of cover is corresponding with generous slab in the water-cooled of chassis, and the another side of cover is connected to the chassis by the chassis water-cooling channel and supports chassis collect cavity in the base plate in the water-cooled of chassis, and the chassis collect cavity is connected with chassis water inlet pipe, chassis outlet pipe.
A kind of wide and heavy plate mill utilizes external force that all dynamic models are combined on the water-cooled chassis with the manufacture method of high fine and close generous slab, and insulated feeder is installed in dynamic model top; Simultaneously,, before cast, long nozzle is placed the die cavity center, wait to be cast the long nozzle preheating; In the casting process, long nozzle is docked with the ladle tapping hole, open ladle, molten steel enters die cavity from long nozzle; Molten metal solidifies in the water-cooled mould, adopts hydraulic system that external force is provided, and makes slab crystallization under pressure; After solidifying end, generous slab carries out shake out, cuts rising head under the condition of high temperature; At last, put into heat-treatment furnace and carry out annealing in process.
The described wide and heavy plate mill manufacture method of high fine and close generous slab, adopt the double-layer heat insulation rising head that generous slab is carried out the top feeding, the double-layer heat insulation rising head adopts the masonry way manufacturing, in the insulated feeder casing, place heat-preservation cotton, use light-weight brick building heat insulation liner again, form the double-layer heat insulation rising head, the rising head tapering is 5～12%, and ratio of height to diameter is (1.2～1.7): 1; Heat-preservation cotton thickness 10～50mm, insulating lining is selected the arc insulating brick, and insulating brick thickness 30～180mm, material are light weeight alumina brick; After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 650 ℃.
The described wide and heavy plate mill manufacture method of high fine and close generous slab, behind casting complete, when slab outer surface solidified layer thickness reaches 20-300mm, begin to increase thrust hydraulic cylinder, exert pressure for slab left and right sides dynamic model, the both sides dynamic model is pushed ahead, dynamic model is closed tightly gradually, the pressure that acts on the slab side is 50～400 tons, and in process of setting, keep-ups pressure; After molten steel all solidifies, draw back dynamic model more gradually, make between dynamic model and the slab and form the space.
Described wide and heavy plate mill adopts the teeming long nozzle steadily to fill the type running gate system and pours into a mould with the manufacture method of high fine and close generous slab, and mouth of a river length is 2.5～3.5m; Long nozzle is designed to three layers of form, and its intermediate layer is a metallic framework, and internal layer high-alumina brick lining forms passage, and is outer with refractory material quartz sand ramming protective layer; After preparation is finished, whole preheating, preheat temperature is not less than 800 ℃; The long nozzle bottom lock, side boiling water mouth flows out the molten steel along continuous straight runs, and die cavity inside and long nozzle all adopt argon shield during cast.
Described wide and heavy plate mill before the cast, feeds hot water or high-temperature steam to combined type water-cooled mould with the manufacture method of high fine and close generous slab earlier, and combined type water-cooled dies cavity is dried; After the cast, slab adopts forced cooling method to cool off, all around with on five directions of bottom the using in the water-cooled and overlap of generous slab, the water-cooling channel of dynamic model from bottom to top, by control discharge, change water-cooled intensity, the narrow gap water-cooling channel width 20～80mm of dynamic model, the degree of depth 3～8mm; Water-cooled chassis changes water-cooled intensity by control discharge, the narrow gap water-cooling channel width 20～80mm of water-cooled chassis, and the degree of depth 3～8mm increases slab bottom intensity of cooling, impels slab to realize from bottom to top consecutive solidification; Adopt big flow velocity cooling water process, water velocity 8～12m/s.
Described wide and heavy plate mill adopts difference intensity process for cooling with the manufacture method of high fine and close generous slab, slab different parts, at the different parts of slab, and the intensity of cooling difference of employing, wherein, the middle part intensity of cooling is big, and the corner intensity of cooling is little.
Described wide and heavy plate mill adopts hot shake-out technology with the manufacture method of high fine and close generous slab, and cast finishes, and slab solidifies back 10-30min shake out fully; Carry out heat with Methods of OFC-A and cut the rising head temperature and be not less than 300 ℃, the generous slab in cutting back adopts hot delivery method to enter heat-treatment furnace to carry out annealing in process; When generous slab was gone into stove, furnace temperature was consistent with casting temperature, and the temperature difference is no more than 100 ℃, and after slab enters heat-treatment furnace, carried out samming earlier, treat that temperature is in full accord after, heat up again.
The invention has the beneficial effects as follows:
1. technological design of the present invention is reasonable, has shortened the production cycle of foundry goods, has improved productivity ratio, has adopted the special-purpose type running gate system of steadily filling, and in casting process, die cavity adopts argon shield, has reduced secondary oxidation and has been mingled with and rolls up defective such as gas, has improved slab quality.
2. the present invention uses rational process for cooling, has increased the density of slab, has eliminated crackle, defective such as loose; Adopt rational heat treatment technology, make the slab even tissueization, improve the slab serviceability.
3. the present invention is applicable to the manufacturing of the generous slab of various models and specification.It is rolling that the generous slab that utilizes the present invention to produce carries out Wide and Thick Slab, can improve plate property, reduces cost, carry out a large amount of productions of Wide and Thick Slab in this way, be easy to obtain customer acceptance, because market potential is huge, in case be widely adopted, generous slab will produce the output value of hundreds of hundred million.
4, slab thickness of the present invention is between 350～1200mm, and weight is 20～70 tons.
In a word, the present invention adopts automatic strand machine mode to make generous slab, adopts the long nozzle cast, and adopts argon shield, and molten steel oxidation is few, has reduced the field trash in the molten steel, has improved the slab degree of purity; Adopt the double-layer heat insulation rising head, strengthened the riser head heat-preserving effect, strengthened the riser feeding ability; Simultaneously, adopt the water-cooled dynamic model, increase the pressure in the slab process of setting, make slab and dynamic model keep well contacting, increased intensity of cooling, reduced slab shrinkage cavity, loosen; Adopt the hot demoulding and heat to cut rising head technology, reduced slab stress, reduced the slab crack defect.Automatically the strand mode is made the generous slab that generous slab can the efficient production plurality of specifications, for the manufacturing of generous slab opened up one new by way of.
Description of drawings
Fig. 1 is generous slab worker dress schematic diagram.Among the figure, 1-insulated feeder casing; The 2-heat-preservation cotton; The 3-insulating lining; The 4-dynamic model; Cover in the 5-water-cooled; The 6-long nozzle; The 7-hydraulic cylinder; The 8-water-cooled chassis.
Fig. 2 is generous slab dynamic model water-cooling system schematic diagram.Among the figure, 41-dynamic model outlet pipe; 42-dynamic model supporting back board; 43-dynamic model water inlet pipe; 44-dynamic model collect cavity; Cover in the 45-dynamic model water-cooled; 46-dynamic model water-cooling channel; 47-dynamic model walking mechanism.
Fig. 3 is a generous slab chassis water-cooling system schematic diagram.Among the figure, 81-chassis water inlet pipe; Cover in the water-cooled of 82-chassis; 83-chassis water-cooling channel; 84-chassis connecting bolt; 85-chassis outlet pipe; 86-chassis alignment pin; Base plate is supported on the 87-chassis; 88-chassis collect cavity.
Fig. 4 is flow field simulation figure as a result in the cavity filling process;
Fig. 5 is temperature field simulation figure as a result in the process of setting;
Fig. 6 is shrinkage cavity, loose distribution simulation figure as a result;
The generous slab exemplar of Fig. 7 for adopting the present invention to produce;
The steel plate of Fig. 8 for adopting the present invention to produce.
The specific embodiment
As shown in Figure 1, the present invention has designed the efficient strand machine of a whole set of generous slab worker dress----, comprises insulated feeder (insulated feeder casing 1, heat-preservation cotton 2, insulating lining 3 are provided with from outside to inside), dynamic model 4, the interior cover 5 of water-cooled, long nozzle 6, hydraulic cylinder 7, water-cooled chassis 8 etc. and the hydraulic power system that external force is provided.Concrete structure is as follows:
Four sides split all around on the water-cooled chassis 8 is provided with dynamic model 4, and the water-cooled chassis 8 that the dynamic model 4 of four sides setting all around and bottom are provided with forms combined type water-cooled moulds, and the die cavity of this combined type water-cooled mould is used for the shaping of generous slab.The top of this combined type water-cooled mould is provided with insulated feeder, long nozzle 6 reaches in the die cavity of combined type water-cooled mould from the top of combined type water-cooled mould, dynamic model 4 inboards of four sides setting all around are provided with cover 5 in the water-cooled, the dynamic model 4 arranged outside hydraulic cylinders 7 of four sides setting all around, all around dynamic model 7 is by hydraulic cylinder 7 supportings, and hydraulic cylinder 7 connects hydraulic power system.
Generous slab solidifies in the die cavity of being made up of the water-cooled chassis 8 combined type water-cooled moulds of all around water-cooled dynamic model 4 and bottom.When matched moulds, hydraulic cylinder is to protracting, and all around 4 dynamic models 2 are merged and put in place, form the slab cavity.Behind casting complete, according to curdled appearance, promote left and right sides dynamic model and travel forward, make it produce pressure to slab, guarantee slab crystallization under pressure.
As shown in Figure 2, the water-cooling system of dynamic model mainly comprises: cover 45, dynamic model water-cooling channel 46, dynamic model walking mechanism 47 etc. in dynamic model outlet pipe 41, dynamic model supporting back board 42, dynamic model water inlet pipe 43, dynamic model collect cavity 44, the dynamic model water-cooled, and concrete structure is as follows:
Dynamic model supporting back board 42 inboards are provided with cover 45 in the dynamic model water-cooled, the one side of cover 45 is corresponding with generous slab in the dynamic model water-cooled, the another side of cover 45 is connected to dynamic model collect cavity 44 in the dynamic model supporting back board 42 by dynamic model water-cooling channel 46 in the dynamic model water-cooled, be connected with dynamic model outlet pipe 41 and dynamic model water inlet pipe 43 on the dynamic model collect cavity 44, dynamic model walking mechanism 47 is installed in dynamic model supporting back board 42 bottoms.
As shown in Figure 3, the water-cooling system on chassis mainly comprises: base plate 87, chassis collect cavity 88 etc. are supported in cover 82, chassis water-cooling channel 83, chassis connecting bolt 84, chassis outlet pipe 85, chassis alignment pin 86, chassis in chassis water inlet pipe 81, the chassis water-cooled, and concrete structure is as follows:
The chassis is supported base plate 87 tops cover 82 in the water-cooled of chassis is set, and water-cooled interior cover 82 in chassis is connected in the chassis by chassis connecting bolt 84 and supports on the base plate 87, and the chassis is supported base plate 87 bottoms chassis alignment pin 86 is set; The one side of cover 82 is corresponding with generous slab in the water-cooled of chassis, and the another side of cover 82 is connected to the chassis by chassis water-cooling channel 83 and supports chassis collect cavity 88 in the base plate 87 in the water-cooled of chassis, and chassis collect cavity 88 is connected with chassis water inlet pipe 81, chassis outlet pipe 85.
The course of work of the efficient strand machine of the present invention comprises:
Utilize external force that all dynamic models 4 are combined on the water-cooled chassis 8, insulated feeder is installed in dynamic model 4 tops, simultaneously,, before cast, long nozzle 6 is placed the die cavity center, wait to be cast long nozzle 6 preheatings.In the casting process, long nozzle is docked with the ladle tapping hole, open ladle, molten steel enters die cavity from long nozzle, realizes in the die cavity charging into argon gas protection, is not subjected to atmospheric oxidn substantially, has alleviated splash, has reduced oxide inclusion.Molten metal solidifies in the water-cooled mould, solidify end after, generous slab carries out shake out (demoulding), cuts rising head under the condition of high temperature; Put into heat-treatment furnace then and carry out the homogenizing annealing processing.
Utilize this method to pour into a mould generous slab, solved problems such as slab oxide inclusion, shrinkage cavity, loose, crackle, produced qualified generous slab; Adopt advanced smelting technique, alloying process and corresponding Technology for Heating Processing to improve material property, by the steel plate that suitable rolling mill practice is produced, mechanical property is even, dense structure, and flaw detection reaches 2 grades of levels of GB/T2970.
The present invention is high, and fine and close generous slab manufacture method is as follows:
1, generous slab Control and Inclusion Removal.The mother metal that high fine and close generous slab is a Wide and Thick Slab, in order to improve the degree of purity of Wide and Thick Slab, minimizing is mingled with, and at first improves the degree of purity of generous slab; Simultaneously, improve the density of Wide and Thick Slab, reduce the shrinkage cavity, loose of generous slab.
Guarantee the degree of purity of generous slab, need to strengthen smelting control, reduce the molten steel inclusion content; Simultaneously, the control casting process reduces secondary oxidation, reduces volume gas, is to reduce the effective ways that are mingled with.In the casting process of generous slab, utilize the air in the argon replaces die cavity, make molten metal under argon shield, enter die cavity.In addition, when adopting the long nozzle cast, long nozzle reduces sputter to greatest extent near cavity bottom.Melted molten metal is poured in the die cavity by long nozzle, and the metal bath surface that long nozzle is followed in the die cavity in the casting process moves up gradually, is watered full fully until metal mold cavity.
2, generous slab shrinkage cavity, loose control.Employing insulated feeder casing 1 inboard is provided with the double-layer heat insulation rising head of heat-preservation cotton 2 and insulating lining 3, increases the feeding capacity of rising head, can effectively increase the utilization rate of rising head, reduces by a shrinkage cavity.Simultaneously, rationally control cooling parameter, the intensity of cooling of emphasis control water-cooled chassis realizes consecutive solidification from top to bottom, forms molten steel feeding passage from the top down, reduces loose.
3, Wide and Thick Slab checking line control.In the generous slab cooling procedure, need cold soon early stage, guarantees that molten steel solidifying under the cooling velocity faster, makes grain refinement, dense structure; Later stage needs slow cooling, because behind molten steel solidification, when slab solidifies back continuation cooling, can produce bigger stress in the slab, comprise thermal stress and transformation stress etc., and the later stage cooling velocity directly influences the size of stress, only reduce the cooling velocity of slab in the later stage, just can reduce the slab internal stress, avoid cracking owing to stress is excessive.
As Fig. 1, Fig. 2, shown in Figure 3, generous slab adopts full water cooling technology.
Wherein, as seen from Figure 1, dynamic model 4 can be promoted forward or be pulled back in process of setting by hydraulic cylinder 7, finishes matched moulds and unpacking; As seen from Figure 2, the water-cooling channel of dynamic model 4 adopts the one-level water-cooling pattern from bottom to top, by control discharge, changes water-cooled intensity, the narrow gap water-cooling channel width 20～80mm of dynamic model 4, the degree of depth 3～8mm; As seen from Figure 3, water-cooled chassis 8 adopts the full water cooling mould, by control discharge, change water-cooled intensity, the narrow gap water-cooling channel width 20～80mm of water-cooled chassis, the degree of depth 3～8mm, increase slab bottom intensity of cooling, impel slab to realize from bottom to top consecutive solidification.The present invention adopts big flow velocity cooling water process, water velocity 8～12m/s.
4, produce the main technologic parameters of generous slab: (1) has finished Feeder Design by computer simulation, the size of rising head, shape and position, and ratio of height to diameter generates automatically by the computer popular software.Rising head adopts insulated feeder, than common rising head size little 1/3.(2) strict control pouring temperature, high temperature is come out of the stove, external refining, pouring temperature is calculated by different steel grade liquidus temperatures, generally is no more than 30 ℃ of liquidus temperatures.(3) adopt hot shake-out technology, in order to reduce the slab thermal stress, after the cast, shake out as early as possible, shake out time is determined according to the simulation setting time, is illustrated in figure 5 as the temperature field of generous slab process of setting.Determine setting time by the temperature field of calculating foundry goods, slab all solidifies back 10-30min shake out; Hang the rising head case earlier, with hydraulic cylinder dynamic model is opened again, slab is pressed from both sides out with clamp specially.(4) carrying out heat with Methods of OFC-A cuts the rising head temperature and is not less than 300 ℃ and (preferably is not less than 500 ℃, be generally 700 ℃～1000 ℃), the generous slab in cutting back adopts heat to be fed into heat treatment kiln, carries out homogenizing annealing and handles, when generous slab is gone into stove, furnace temperature is consistent with casting temperature, the temperature difference is no more than 100 ℃, and after slab enters heat-treatment furnace, carries out samming earlier, after treating that temperature is in full accord, heat up again.Among the present invention, the homogenizing annealing heat treatment temperature is 900～1120 ℃, and temperature retention time is 4-12h, cools off with stove.
As shown in Figure 1, the present invention is according to the intensity of cooling requirement, and control discharge and thrust hydraulic cylinder simultaneously, according to the cast requirement, have designed long nozzle; Be specially:
1) according to the feeding requirement, design double-layer heat insulation rising head, the double-layer heat insulation rising head adopts the masonry way manufacturing, in the insulated feeder casing, place heat-preservation cotton, use light-weight brick building heat insulation liner again, form the double-layer heat insulation rising head, the rising head tapering is 5～12% (the insulated feeder internal diameter is up-small and down-big), and ratio of height to diameter (ratio of height to diameter is riser height and riser height central spot diameter ratio) is (1.2～1.7): 1.
Heat-preservation cotton thickness 10～50mm, insulating lining is selected the arc insulating brick, and insulating brick thickness 30～180mm, material are light weeight alumina brick.After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 650 ℃, is generally 700 ℃～1000 ℃.
2) dynamic model can move forward and backward under hydraulic cylinder promotes, and single cylinder design thrust is 20～100 tons, 4 hydraulic cylinders of single face.During mould assembling, by automatically controlled limit switch control matched moulds position, behind casting complete, molten steel solidification is to certain thickness, when the outer surface solidified layer thickness reaches 20-300 (being preferably 50-200) mm, begin to increase thrust hydraulic cylinder, exert pressure for slab left and right sides dynamic model, the both sides dynamic model is pushed ahead, dynamic model is closed tightly gradually, the pressure that acts on the slab side is 50～400 tons, and in process of setting, keep-ups pressure.After molten steel all solidifies, draw back dynamic model more gradually, make between dynamic model and the slab and form the space, reduce intensity of cooling.
3) intensity of cooling is mainly adjusted by water-cooling channel discharge.After the matched moulds, before the cast, feed hot water (60～90 ℃) earlier, or high-temperature steam (100～150 ℃), dies cavity is dried.Begin to feed cold water after the cast, and the increased water flow amount, the flow velocity of water is not less than 6m/s and (is generally 8～12m/s) in the assurance water-cooling channel.After solidifying a period of time, discharge is reduced gradually, up to shake out.After the shake out, still carry out water-cooled, guarantee that mold temperature drops to below 100 ℃, stop to supply water.
At the different parts of slab, the intensity of cooling difference of employing, wherein: the middle part intensity of cooling is big, and the corner intensity of cooling is little.
4) long nozzle is designed to three layers of form, and its intermediate layer is metal (steel) skeleton, and internal layer high-alumina brick lining forms passage, and is outer with refractory material quartz sand ramming protective layer, shields.After preparation is finished, whole preheating, preheat temperature is not less than 800 ℃, is generally 900 ℃～1300 ℃.The long nozzle bottom lock, side boiling water mouth flows out the molten steel along continuous straight runs, reduces the chassis is washed away.Adopt the teeming long nozzle steadily to fill the type running gate system and pour into a mould, mouth of a river length is 2.5～3.5m, and die cavity inside and long nozzle all adopt argon shield during cast.
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
Embodiment 1
Adopt the double-layer heat insulation rising head, internal layer is the thick light weeight alumina brick of 80mm, and skin is the thick heat-preservation cotton of 15mm; The molten steel tapping temperature is 1590 ℃, carries out blowing argon gas refining outside the stove in the refining bag, strict control phosphorus, sulfur content, P≤0.015%, S≤0.008%, 60 tons of casting of molten metal weight, the duration of pouring 25min, 1560 ℃ of pouring temperatures.Cast is applying argon gas in die cavity before, pours into a mould under argon shield.After cast finishes 30min, increase cylinder pressure, make single cylinder pressure be increased to 50 tons gradually.Pressurize 3h begins decompression.Behind the 20min, convert cylinder pressure to pulling force, make dynamic model leave slab gradually.
By weight percentage, the slab material composition is: C 0.2%, and Si 0.65%, and Mn 1.2%, P≤0.015%, S≤0.008%, Fe surplus; Adopt hot shake-out technology, casting pouring finishes, and solidifies back 20min shake out fully; Carry out heat with Methods of OFC-A and cut rising head, it is 500 ℃ that heat is cut the rising head temperature, and the cutting after heat is fed into heat treatment kiln, implements homogenizing annealing, and the homogenizing annealing temperature is 980 ℃, and temperature retention time is 8h, cools off with stove.
In the present embodiment: (1) adopts the long nozzle cast, and mouth of a river length is 3m, has played the effect of steadily filling type, and slab does not have bulk to be mingled with.(2) use insulated feeder, increased the riser feeding ability, eliminated shrinkage cavity, rarefaction defect.(3) adopt water cooled mo(u)ld to force cooling, water velocity 8m/s has guaranteed the slab density, has improved production efficiency, and has protected mould.(4) adopt the hydraulic cylinder pressurization, the contact condition of dynamic model and slab is changed, changed the cooling velocity that slab solidifies each time period, reduced thermal stress, reduced the tendency that slab cracks, slab does not have fire check.
The present invention adopts the computer popular software to carry out the simulation of temperature field, flow field and casting defect, the flow field simulation result as shown in Figure 4 in the cavity filling process, Figure 5 shows that temperature field simulation result in the process of setting, the shrinkage cavity of slab, loose analog result are as shown in Figure 6, only a small amount of loosening arranged, the inner no shrinkage cavity rarefaction defect of slab in the rising head bottom.Fig. 7 is generous slab exemplar, the Wide and Thick Slab of Fig. 8 for adopting the present invention to produce, and the surface does not crack yet.
Adopt the double-layer heat insulation rising head, internal layer light weeight alumina brick thickness is 60mm, and outer heat-preservation cotton thickness is 25mm; Molten steel high temperature is come out of the stove, and tapping temperature is 1580 ℃, carries out blowing argon gas refining outside the stove in the refining bag, strict control phosphorus, sulfur content, P≤0.015%, S≤0.008%, 58 tons of casting of molten metal weight, the duration of pouring 25min, 1550 ℃ of pouring temperatures.Cast is applying argon gas in die cavity before, pours into a mould under argon shield.After cast finishes 50min, increase cylinder pressure, make single cylinder pressure be increased to 80 tons gradually.Pressurize 3h begins decompression.Behind the 30min, convert cylinder pressure to pulling force, make dynamic model leave slab gradually.
By weight percentage, the slab material composition is: C 0.21%, and Si 0.66%, and Mn 1.20%, P≤0.015%, S≤0.008%, Fe surplus; Adopt hot shake-out technology, casting pouring solidifies back 20min shake out fully; Carry out heat with Methods of OFC-A and cut rising head, it is 550 ℃ that heat is cut the rising head temperature, and the cutting after heat is fed into heat treatment kiln, carries out homogenizing annealing and handles, and homogenization temperature is 980 ℃, and temperature retention time is 6h, cools off with stove.
In the present embodiment: (1) adopts the long nozzle cast, and mouth of a river length is 2.5m, and before cast, applying argon gas in die cavity has reduced secondary oxidation.(2) use insulated feeder, increase heat-preservation cotton thickness, improved the riser head heat-preserving effect, slab does not have rarefaction defect.(3) before the cast, logical temperature is 80 ℃ hot water starting, has dried die cavity, with the cold water cooling, has guaranteed the slab density after the cast.(4) adopt the pressure cooling, water velocity 10m/s after cast, exerts pressure to slab, adjusts the coefficient of heat transfer between slab and the dynamic model, has reduced the slab thermal stress, has reduced the slab hot cracking tendency.
Embodiment 3
Adopt the double-layer heat insulation rising head, internal layer light weeight alumina brick thickness is 100mm, the thick 30mm of outer heat-preservation cotton; The molten steel tapping temperature is 1595 ℃; in the refining bag, carry out blowing argon gas refining outside the stove; strict control phosphorus, sulfur content; P≤0.015%, S≤0.008%, casting of molten metal weight is 62 tons; the duration of pouring 28min; 1565 ℃ of pouring temperatures, cast be applying argon gas in die cavity before, pours into a mould under argon shield.Behind the cast 60min, increase cylinder pressure, make single cylinder pressure be increased to 100 tons gradually.Pressurize 3h begins decompression.Behind the 10min, convert cylinder pressure to pulling force, make dynamic model leave slab gradually.
By weight percentage, the slab material composition is: C 0.17%, and Si 0.56%, and Mn 1.10%, P≤0.015%, S≤0.008%, Fe surplus; Adopt hot shake-out technology, after casting pouring finished, foundry goods solidified back 30min shake out fully; Carry out heat with Methods of OFC-A and cut rising head, it is 650 ℃ that heat is cut the rising head temperature, and the cutting after heat is fed into heat treatment kiln, carries out homogenising and handles, and homogenization temperature is 980 ℃, and temperature retention time is 10h, cools off with stove.
In the present embodiment: (1) adopts the long nozzle cast, and mouth of a river length is 3.5m, and it is more steady to fill type, does not produce serious sputter, and before cast, applying argon gas in die cavity has reduced secondary oxidation.(2) use insulated feeder, increase heat-preservation cotton thickness, improved the riser head heat-preserving effect, slab is without any rarefaction defect, and rising head is the plane and shrinks downwards.(3) before the cast, logical temperature is 90 ℃ hot water starting, has dried die cavity, has guaranteed the steel slab surface quality, and with the cold water cooling, water velocity 10m/s has guaranteed the slab density after the cast.(4) after cast, exert pressure, adjust the coefficient of heat transfer between slab and the dynamic model, reduced the slab thermal stress, reduced the slab hot cracking tendency to slab.
Utilize the present invention to carry out the generous slab casting of wide and heavy plate mill, in smelting process, the control impurity content guarantees the molten steel degree of purity; Utilize the long nozzle cast, reduced splash, and, in casting process, adopt argon shield, reduced volume gas and secondary oxidation and be mingled with; Adopt Constraint Cooling Technology, guaranteed the slab density; Adjust contact condition between dynamic model and the slab, change the coefficient of heat transfer between slab and the dynamic model, effectively overcome Wide and Thick Slab checking line problem.
The course of work of the present invention and result:
Force cooling and long nozzle pouring technology because the present invention adopts, can guarantee carrying out smoothly of generous slab cast and cooling.In the slab cooling procedure, regulate intensity of cooling by the gap of adjusting between slab and the dynamic model, effectively overcome Wide and Thick Slab checking line problem, prepared qualified generous slab.
The present invention has designed long nozzle and has steadily filled type running gate system, insulated feeder and hot releasing process, adopts argon shield in the casting process simultaneously, prevents to roll up gas and rolls up assorted; Adopt Constraint Cooling Technology and slab pressure crystallization processes, accelerate the setting rate of slab, increase the slab density, guarantee generous slab quality.
Claims (10)
1. a wide and heavy plate mill is with the manufacturing frock of high fine and close generous slab, it is characterized in that: the hydraulic power system that this worker is equiped with insulated feeder, dynamic model, the interior cover of water-cooled, long nozzle, hydraulic cylinder, water-cooled chassis and external force is provided, concrete structure is as follows:
Four sides split all around on the water-cooled chassis is provided with dynamic model, and the water-cooled chassis that the dynamic model of four sides setting all around and bottom are provided with forms combined type water-cooled mould; The top of this combined type water-cooled mould is provided with insulated feeder, long nozzle reaches in the die cavity of combined type water-cooled mould from the top of combined type water-cooled mould, the dynamic model inboard of four sides setting all around is provided with cover in the water-cooled, the dynamic model arranged outside hydraulic cylinder of four sides setting all around, all around dynamic model supports by hydraulic cylinder, and hydraulic cylinder connects hydraulic power system.
2. according to the manufacturing frock of the described wide and heavy plate mill of claim 1 with high fine and close generous slab, it is characterized in that: dynamic model is provided with water-cooling system, the water-cooling system of dynamic model is provided with the dynamic model outlet pipe, the dynamic model supporting back board, the dynamic model water inlet pipe, the dynamic model collect cavity, cover in the dynamic model water-cooled, the dynamic model water-cooling channel, the dynamic model walking mechanism, dynamic model supporting back board inboard is provided with cover in the dynamic model water-cooled, the one side of cover is corresponding with generous slab in the dynamic model water-cooled, the another side of cover is connected to dynamic model collect cavity in the dynamic model supporting back board by the dynamic model water-cooling channel in the dynamic model water-cooled, be connected with dynamic model outlet pipe and dynamic model water inlet pipe on the dynamic model collect cavity, the dynamic model walking mechanism is installed in dynamic model supporting back board bottom.
3. according to the manufacturing frock of the described wide and heavy plate mill of claim 1 with high fine and close generous slab, it is characterized in that: water-cooled chassis is provided with water-cooling system, the water-cooling system of water-cooled chassis is provided with cover in chassis water inlet pipe, the chassis water-cooled, chassis water-cooling channel, chassis connecting bolt, chassis outlet pipe, chassis alignment pin, chassis support base plate, chassis collect cavity, the chassis is supported the base plate top cover in the water-cooled of chassis is set, and the chassis is supported the base plate bottom chassis alignment pin is set; The one side of cover is corresponding with generous slab in the water-cooled of chassis, and the another side of cover is connected to the chassis by the chassis water-cooling channel and supports chassis collect cavity in the base plate in the water-cooled of chassis, and the chassis collect cavity is connected with chassis water inlet pipe, chassis outlet pipe.
4. a manufacture method of utilizing the wide and heavy plate mill of the described frock of claim 1 with high fine and close generous slab is characterized in that: utilize external force that all dynamic models are combined on the water-cooled chassis, insulated feeder is installed in dynamic model top; Simultaneously,, before cast, long nozzle is placed the die cavity center, wait to be cast the long nozzle preheating; In the casting process, long nozzle is docked with the ladle tapping hole, open ladle, molten steel enters die cavity from long nozzle; Molten metal solidifies in the water-cooled mould, adopts hydraulic system that external force is provided, and makes slab crystallization under pressure; After solidifying end, generous slab carries out shake out, cuts rising head under the condition of high temperature; At last, put into heat-treatment furnace and carry out annealing in process.
5. according to the manufacture method of the described wide and heavy plate mill of claim 4 with high fine and close generous slab, it is characterized in that: adopt the double-layer heat insulation rising head that generous slab is carried out the top feeding, the double-layer heat insulation rising head adopts the masonry way manufacturing, in the insulated feeder casing, place heat-preservation cotton, use light-weight brick building heat insulation liner again, form the double-layer heat insulation rising head, the rising head tapering is 5～12%, and ratio of height to diameter is (1.2～1.7): 1; Heat-preservation cotton thickness 10～50mm, insulating lining is selected the arc insulating brick, and insulating brick thickness 30～180mm, material are light weeight alumina brick; After rising head is built by laying bricks or stones and finished, carry out preheating, preheat temperature is not less than 650 ℃.
6. according to the manufacture method of the described wide and heavy plate mill of claim 4 with high fine and close generous slab, it is characterized in that: behind casting complete, when slab outer surface solidified layer thickness reaches 20-300mm, begin to increase thrust hydraulic cylinder, exert pressure for slab left and right sides dynamic model, the both sides dynamic model is pushed ahead, dynamic model is closed tightly gradually, the pressure that acts on the slab side is 50～400 tons, and in process of setting, keep-ups pressure; After molten steel all solidifies, draw back dynamic model more gradually, make between dynamic model and the slab and form the space.
7. according to the manufacture method of the described wide and heavy plate mill of claim 4 with high fine and close generous slab, it is characterized in that: adopt the teeming long nozzle steadily to fill the type running gate system and pour into a mould, mouth of a river length is 2.5～3.5m; Long nozzle is designed to three layers of form, and its intermediate layer is a metallic framework, and internal layer high-alumina brick lining forms passage, and is outer with refractory material quartz sand ramming protective layer; After preparation is finished, whole preheating, preheat temperature is not less than 800 ℃; The long nozzle bottom lock, side boiling water mouth flows out the molten steel along continuous straight runs, and die cavity inside and long nozzle all adopt argon shield during cast.
8. according to the manufacture method of the described wide and heavy plate mill of claim 4, it is characterized in that: before the cast, earlier combined type water-cooled mould is fed hot water or high-temperature steam, combined type water-cooled dies cavity is dried with high fine and close generous slab; After the cast, slab adopts forced cooling method to cool off, all around with on five directions of bottom the using in the water-cooled and overlap of generous slab, the water-cooling channel of dynamic model from bottom to top, by control discharge, change water-cooled intensity, the narrow gap water-cooling channel width 20～80mm of dynamic model, the degree of depth 3～8mm; Water-cooled chassis changes water-cooled intensity by control discharge, the narrow gap water-cooling channel width 20～80mm of water-cooled chassis, and the degree of depth 3～8mm increases slab bottom intensity of cooling, impels slab to realize from bottom to top consecutive solidification; Adopt big flow velocity cooling water process, water velocity 8～12m/s.
9. according to the manufacture method of the described wide and heavy plate mill of claim 4 with high fine and close generous slab, it is characterized in that: the slab different parts adopts difference intensity process for cooling, at the different parts of slab, the intensity of cooling difference that adopts, wherein, the middle part intensity of cooling is big, and the corner intensity of cooling is little.
10. according to the manufacture method of the described wide and heavy plate mill of claim 4 with high fine and close generous slab, it is characterized in that: adopt hot shake-out technology, cast finishes, and slab solidifies back 10-30min shake out fully; Carry out heat with Methods of OFC-A and cut the rising head temperature and be not less than 300 ℃, the generous slab in cutting back adopts hot delivery method to enter heat-treatment furnace to carry out annealing in process; When generous slab was gone into stove, furnace temperature was consistent with casting temperature, and the temperature difference is no more than 100 ℃, and after slab enters heat-treatment furnace, carried out samming earlier, treat that temperature is in full accord after, heat up again.
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| CN102941322A (en) * | 2012-11-07 | 2013-02-27 | 秦皇岛核诚镍业有限公司 | Production method of corrosion resistant alloy plates and split type pouring die used by same |
| CN103008626A (en) * | 2013-01-17 | 2013-04-03 | 中国科学院金属研究所 | Method used for high-temperature liquid core mold dismantling of large-scale extra-thick plate blank |
| CN105312515A (en) * | 2015-11-26 | 2016-02-10 | 中冶京诚工程技术有限公司 | Casting equipment and method of steel ingot for wide and thick plate |
| CN107138696A (en) * | 2017-04-25 | 2017-09-08 | 北京航空航天大学 | A kind of consecutive solidification process unit being used in vacuum smelting equipment and method |
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| CN102886501A (en) * | 2012-10-09 | 2013-01-23 | 中国科学院金属研究所 | Tooling for efficiently manufacturing wide thick plate blank for wide thick plate rolling machine and manufacture method thereof |
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| CN105312515B (en) * | 2015-11-26 | 2018-12-18 | 中冶京诚工程技术有限公司 | Casting equipment and method of steel ingot for wide and thick plate |
| CN107138696A (en) * | 2017-04-25 | 2017-09-08 | 北京航空航天大学 | A kind of consecutive solidification process unit being used in vacuum smelting equipment and method |
| CN107138696B (en) * | 2017-04-25 | 2018-05-01 | 北京航空航天大学 | A kind of consecutive solidification process unit being used in vacuum smelting equipment and method |
| CN112317706A (en) * | 2020-09-11 | 2021-02-05 | 南京钢铁股份有限公司 | Argon protection pouring operation method for continuous casting tundish |
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Application publication date: 20110824 Assignee: Jiangsu Sunan Heavy Industry Machinery Technology Co., Ltd. Assignor: Institute of metal research, Chinese Academy of Sciences Contract record no.: 2014210000003 Denomination of invention: Manufacturing tool of high-compact wide and thick plate blank for wide and thick plate rolling mill and method Granted publication date: 20130102 License type: Exclusive License Record date: 20140120 |
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