CN104815971B - Casting method and casting device - Google Patents
Casting method and casting device Download PDFInfo
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- CN104815971B CN104815971B CN201510055850.6A CN201510055850A CN104815971B CN 104815971 B CN104815971 B CN 104815971B CN 201510055850 A CN201510055850 A CN 201510055850A CN 104815971 B CN104815971 B CN 104815971B
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- suppression component
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- 238000000034 method Methods 0.000 title claims abstract description 128
- 238000005266 casting Methods 0.000 title claims abstract description 111
- 238000001816 cooling Methods 0.000 claims abstract description 170
- 230000001629 suppression Effects 0.000 claims abstract description 63
- 208000037656 Respiratory Sounds Diseases 0.000 claims abstract description 29
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims description 55
- 239000002184 metal Substances 0.000 claims description 55
- 239000011810 insulating material Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 20
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 13
- 229910001566 austenite Inorganic materials 0.000 claims description 11
- 230000009466 transformation Effects 0.000 claims description 11
- 229910001562 pearlite Inorganic materials 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 229910052742 iron Inorganic materials 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 239000002893 slag Substances 0.000 description 11
- 238000003780 insertion Methods 0.000 description 10
- 230000037431 insertion Effects 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000007790 solid phase Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010008 shearing Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007769 metal material Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 229910001567 cementite Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
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- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
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- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
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- Continuous Casting (AREA)
Abstract
The present invention provides a kind of for preventing that the casting method of crackle and casting device occurs in the core of strand in casting process.The casting method at least includes refrigerating work procedure, in the refrigerating work procedure, cooling has the strand of the solidified shell for the peripheral part for not solidifying portion and not solidifying portion positioned at this, wherein, the refrigerating work procedure includes cooling and suppresses process, in the cooling suppresses process, the cooling for cooling down the suppression component suppression strand is utilized.
Description
Technical field
The present invention relates to casting method and casting device, more particularly to for preventing the central part of the strand in casting process
Separate the casting method and casting device of existing crackle.
Background technology
As one of process for producing steel and iron, steel process integration can be included.Specifically, it is such technique：
Molten iron is manufactured from iron ore in blast furnace, then molten steel is manufactured from molten iron in converter, is made afterwards by continuously casting through secondary fine
Refine and the molten steel solidification of high purity.Hot rolling is carried out after the casting piece heating to obtaining, is obtained afterwards by multiple processes
Steel product (non-patent literature 1).
Continuous casting process is the method, i.e. for the casting for continuously entering to exercise molten steel solidification：Continuously to molten steel in mold
Cast and be continuously taken out cakey strand the method that is produced.As the equipment of continuous casting apparatus, have：
Tundish for distributing the molten steel from casting ladle；Dipping spray nozzle for guiding from molten steel to mold；For making molten steel solidification and
Form the mold of solidified shell；And for secondary cooling band for being cooled down around solidified shell to solidified shell etc..
Using continuous casting process, molten metal can be made continuously to solidify, therefore, it is possible to improve productivity ratio.Also, the company
Continuous casting is the method for coping with the various metal materials such as iron system, aluminium system, copper system and their alloy.
The content of the invention
Problems to be solved by the invention
The problem of as continuous casting process, the face crack of strand, underbead crack in casting process can be included.It is molten
Melt metal gradually to solidify as temperature is reduced, therefore the difference of the composition according to metal material, in spy during casting
Sometimes not stretch-proof, not resistant to bending frangible property are shown in fixed temperature province.Apply herein for some reason
During tensile stress, occurs crackle on strand sometimes.Particularly, the strand that crackle occurs in core is difficult to meet end article
Requirement performance, it is impossible to enter the ensuing process such as hot-working, cause productivity ratio to reduce.
Prior art literature
Non-patent literature
Non-patent literature 1：Japanese Tanaka and Ming write, " the basic と bodyguards Group body of the I newest metal of く わ か Ru ", the 1st edition, strain
The show of formula commercial firm and シ ス テ system, on March 15th, 2013, p.124-125.
In view of described problem point, is used to prevent the center of the strand in casting process it is an object of the invention to provide a kind of
There is the casting method of crackle and casting device in part.
The solution used to solve the problem
In order to solve described problem, the present inventor is to for preventing that crackle occurs in the core of strand in casting process
Method conscientiously studied.As a result find, in casting process, pass through the strand that suppresses that there is solidified shell in peripheral part
Cooling, can prevent the core of strand from crackle occur.Moreover, by suppressing to cool down, additionally it is possible to prevent the temperature mistake of strand
Degree reduction, as a result, the burden reheated in the ensuing process such as hot-working to strand can be mitigated.The present inventor obtains institute
Opinion is stated, so as to contemplate the present invention.
That is, casting method of the invention at least include refrigerating work procedure, in the refrigerating work procedure, cooling have do not solidify portion and
Do not solidify the strand of the solidified shell of the peripheral part in portion positioned at this, wherein, the refrigerating work procedure includes cooling and suppresses process, cold at this
But suppress in process, the slab cooling is suppressed using suppression component is cooled down.
Another technical scheme of the present invention is a kind of casting device, and the casting device at least includes：Mold, it is used to cool down
The alloy molten metal being injected into, so as to form the solidified shell with the peripheral part for not solidifying portion and not solidifying portion positioned at this
Strand；Suppression component is cooled down, it is used for the cold of the strand that suppression vertically declines from the mold bottom of the mold
But.
The effect of invention
Using the casting method and casting device of the present invention, it can prevent the core of the strand in casting process from occurring
Crackle.
Brief description of the drawings
Fig. 1 is the sectional view for the form for representing the casting device of the present invention.
Fig. 2 is the sectional view for the casting device for representing the form different from Fig. 1.
Fig. 3 is the sectional view for the casting device for representing the form different from Fig. 1, Fig. 2.
Fig. 4 is the sectional view for the casting device for representing the form different from Fig. 1~Fig. 3.
Fig. 5 is the figure for representing to cool down a form of suppression component.
Fig. 6 is the sectional view for representing conventional casting device.
Fig. 7 is the sectional view of the strand cast by embodiment 1,2.
Fig. 8 is the sectional view of the strand cast by comparative example 1,2.
Fig. 9 is the sectional view of the strand cast by embodiment 3.
Embodiment
Hereinafter, the casting method of the present invention and the gross morphology of casting device are described in detail.Wherein, the present invention not by with
The form to be illustrated down is limited.
The casting method of the present invention at least includes refrigerating work procedure, in the refrigerating work procedure, and cooling, which has, does not solidify portion and position
In the strand of the solidified shell of the peripheral part for not solidifying portion.By cooling down the strand, coagulate the portion that do not solidify surrounded by solidified shell
Gu, and obtain casting piece.Cooling has such situation：Force cold using cooling device according to the thermal capacity of obtained strand
But the situation of natural cooling under situation, the room temperature atmosphere under casting environment, the refrigerating work procedure also includes cooling and suppresses work
Sequence, in the cooling suppresses process, suppresses the slab cooling, so that the cooling velocity of the strand is slower than natural cooling (air
Middle heat release).It can prevent that crackle occurs in the core of strand in cooling procedure by the process.In refrigerating work procedure,
The period for not suppressing the core crackle to be occurred of strand in the case of cooling down suppresses cooling, is split so as to prevent
Line.In addition, in addition in the period of the crackle to be occurred, additionally it is possible to which the predetermined portion before and after the period also suppresses cold
But.Also can since the refrigerating work procedure untill refrigerating work procedure terminates during suppress cooling.
As long as cooling suppression component can suppress the part of the slab cooling.The strand is not solidifying portion
Peripheral part has solidified shell, but does not turn cold completely, therefore surface temperature is very high.Therefore, cooling suppression component can be wrapped at least
Include heat-insulating material, the heat-insulating material have can be resistant to residence state strand surface temperature heat resistance.It is used as heat-insulating material, example
If using ceramic fiber blanket, refractory brick, rock wool, heat-insulating shield, insulation brick etc..As cooling suppression component, it can include
The part on the solidified shell periphery of the strand can be covered using the heat-insulating material.For example, can be using such cooling suppression
Part processed：The cooling suppression component is box-like, tubular etc., corresponding with the shape of strand to have insertion cooling along the vertical direction
The spatial portion of suppression component or the spatial portion along vertical with the above-below direction direction insertion cooling suppression component, cooling suppression
The inwall influenceed by the heat of strand of part processed is covered by heat-insulating material.The heat-insulating material both can be solidifying with the strand
Gu shell is contacted, it can not also be contacted with the solidified shell of the strand.Wherein, for the effect for the cooling that is fully inhibited, preferably
The distance between solidified shell and heat-insulating material of the strand are 0mm~100mm.
The casting method of the present invention copes with the various metal materials, energy such as iron system, aluminium system, copper system and their alloy
The material for enough making the strand is ferrous materials.Ferrous materials are the materials using iron as main component, are important industrial materials.
The casting method of the present invention is can be using such ferrous materials as the method for object.
In the case where the material of the strand is ferrous materials, strand does not solidify portion and can be frozen into Ovshinsky because of cooling
Body tissue, by further cooling down as ferritic structure.In the case of the carbon steel containing carbon, strand does not solidify portion's meeting
The two-phase mixture of austenite and cementite is frozen into because of cooling, by further cooling down as ferrite and cementite
Two-phase mixture, i.e. pearlitic structrure.On the other hand, solidified shell is further cooled by from austenite and turns into ferrite, in carbon
Turn into pearlite from the two-phase mixture of austenite and cementite in the case of steel.Austenite constructs for face-centered cubic lattice, former
Sub- filling rate is 74%.On the other hand, ferrite constructs for body-centered cubic lattic, and atom filling rate is 68%.By from Ovshinsky
Body is reduced to ferritic transformation, thus atom filling rate, therefore the volume of strand is expanded.In refrigerating work procedure, from strand
Surface internally from austenite to ferritic transformation, the expansion of volume is also internally in progress from the surface of casting.From volume
Starting the strand in a period of being expanded into untill expansion terminates has not stretch-proof, not resistant to bending frangible property.In strand
In the case that volume drastically expands, when applying tensile stress for some reason in a period of untill expansion terminates, casting
Easily there is crackle in the core of base.
In the casting method of the present invention, the cooling, which suppresses process, to suppress process including the 1st cooling, the 1st
Cooling suppresses in process, suppresses cooling during from austenite structure to ferritic structure or pearlite transformation.
Make during the volume of strand starts to be expanded into untill expansion terminates, to suppress to cause the body of strand because of cooling because of transformation
Product drastically expands, therefore, it is possible to prevent the core of strand from crackle occur.The 1st cooling suppression process can use described
Cool down suppression component.
The casting method of the present invention can use continuous casing.The continuous casing at least include injection process,
Strand formation process, removal process and refrigerating work procedure.The injection process is cast for the molten metal of ferrous materials to be injected
The process of mould, is the process formed for solidifying molten metal before strand.The strand formation process is to be used to pass through
Cool down the mold and cool down the molten metal, so that the process for forming strand, the strand, which has, not to be solidified portion and be located at
This does not solidify the solidified shell of the peripheral part in portion.Molten metal is cooled down by the process and forms strand.The removal process is
Process for taking out the strand from the mold.The strand taken out by the process can in ensuing process quilt
Cooling, and molten metal is injected into the mold for taken out strand successively.After the refrigerating work procedure is the removal process
Process for cooling down the strand.By the process, make with do not solidify the strand in portion and solidified shell to ferritic structure or
Person's pearlite transformation.Using the continuous casing including these processes continuously molten metal can be cast come
Manufacture strand.
The continuous casing can also include strand cut off operation, and the strand cut off operation is in the refrigerating work procedure
Afterwards, the strand is cut off.Can again it be melted by vacuum arc according to circumstances using the strand under cutting as electrode
Enter the hot-working of ensuing process after the processing such as change, electroslag remelted.Hot-working is by more than recrystallization temperature
Hot-working such as is rolled, forged, being extruded at the plastic working to metal material.Accordingly, it would be desirable to by the heating strand cooled to again
It is more than crystallization temperature, by from be changed into ferritic structure or pearlitic structrure state, to the strand be cut off untill
During suppress cooling, the burden heated can be mitigated.Therefore, in the casting method of the present invention, the cooling suppresses
Process can include the 2nd cooling suppress process, the 2nd cooling suppress process in, suppress until be changed into ferritic structure or
The cooling that the strand of pearlitic structrure is carried out untill being cut off.2nd cooling, which suppresses process, can use the cooling
Suppression component.In addition, it can be discontinuous process that the 1st cooling, which suppresses process and the 2nd cooling suppression process, and
Also can be continuous process.For example, constantly suppressing slab cooling, until what is taken out from mold by cooling down suppression component
Untill strand is cut off, continuous cooling can be set to and suppress process.
The continuous casing can include being used to cool down institute after the removal process and before the refrigerating work procedure
State the secondary cooling process of strand.Strand is cooled down before just suppressing cooling by the process, so as to shorten cooling
During strand, therefore, it is possible to improve casting efficiency.As secondary cooling process, it can include for example by injection water, spray
The process from the solidified shell of outside cooling strand such as emanation water.
Then, the casting device of the present invention is illustrated.The casting device of the present invention at least includes mold and cooling suppression component.
The mold is used to cool down the molten metal being injected into and form strand, and the strand, which has, not to be solidified portion and do not solidified positioned at this
The solidified shell of the peripheral part in portion.Mold can use mould, preferably with being injected for molten metal, along the vertical direction
The mold of the spatial portion of the insertion mold.Because, molten metal can be injected into mold from the spatial portion top, and certainly
The strand for cooling down and producing by the molten metal for making to be injected into is taken out in the spatial portion bottom, so as to improve manufacture effect
Rate.The cooling suppression component is the cold of the strand that vertically declines for the mold bottom suppressed from the mold
But part.The strand declined from the mold is cold by natural cooling etc. under the room temperature atmosphere under casting environment
But.It can prevent that crackle occurs in the core of strand in cooling procedure using cooling suppression component.In cooling procedure,
Using cooling suppression component in the period of the core of strand crackle to be occurred, so as to prevent crackle.In addition, removing
Outside in the period of the desire crackle occurs, additionally it is possible to also suppress cooling before and after the period.Also can be from bosher
Sequence suppresses cooling during starting untill refrigerating work procedure terminates.
The cooling suppression component can at least include the heat-insulating material with heat resistance.As heat-insulating material, for example can
Enough using ceramic fiber blanket, refractory brick, rock wool, heat-insulating shield, insulation brick etc..As cooling suppression component, can include can
The part on the solidified shell periphery of the strand is covered using the heat-insulating material.For example, can be using such cooling suppressing portion
Part：The cooling suppression component is box-like, tubular etc., corresponding with the shape of strand to have the suppression of insertion cooling along the vertical direction
The spatial portion of part, the inwall influenceed by the heat of strand of cooling suppression component is covered by heat-insulating material.The heat-insulating material
Both it can contact, can not also be contacted with the solidified shell of the strand with the solidified shell of the strand.Wherein, in order to fully obtain
Suppress the effect of cooling, the distance between the solidified shell and heat-insulating material of preferably described strand is 0mm~100mm.
For the casting device of the present invention, the material of the strand is ferrous materials, so as to using ferrous materials as casting
Make object.In this case, the cooling suppression component can include the 1st cooling suppression component, and the 1st cooling suppression component is used
In suppress the strand during untill the austenite structure of the strand terminates to ferritic structure or pearlite transformation
Interior cooling.During making the volume of strand start to be expanded into untill expansion terminates because of transformation, it can suppress because of cooling
The volume of strand is caused drastically to expand, therefore, it is possible to prevent the core of strand from crackle occur.The 1st cooling suppression component
The cooling suppression component can be used.
The casting device of the present invention can use continuous casting apparatus.The continuous casting apparatus at least include container, mold,
Control unit and cooling suppression component.The container is the molten metal for keeping ferrous materials and injects the molten metal
The container of the mold.As the container, tundish can be included.Tundish can adjust the flow of molten metal, and
The slag in molten metal, field trash etc. can be made to float and be separated.For the mold, be it is described above like that, more
Specifically, usually using the mold with the spatial portion of the insertion mold along the vertical direction, the mold be water-cooled copper or
Mould made of iron.The control unit is the strand for controlling the mold bottom from the mold vertically to decline
Decrease speed part.If strand decrease speed in the presence of own wt is too fast, the relatively thin portion of solidified shell sometimes
Distribution life ruptures and leaks not solidified molten metal exposure, i.e. generation casting.In addition, if decrease speed is excessively slow, production efficiency
Reduction.Therefore, in order to maintain production efficiency and stably manufacture strand, it is necessary to the control unit of the decrease speed for controlling strand
Part.As control unit, lowering or hoisting gear for the pull-out that can control strand etc. can be used.It is described cooling suppression component be more than
It is described such.
The continuous casting apparatus can also include strand cut component, and the strand cut component is used for being changed into iron element
Body tissue or the strand of pearlitic structrure are cut off.In this case, the cooling suppression component can be cold including the 2nd
But suppression component, the 2nd cooling suppression component is used to suppress the casting until being changed into ferritic structure or pearlitic structrure
Cooling in a period of untill base is cut-off.By setting the 2nd cooling suppression component, it can mitigate in ensuing process
Ingot casting is heated to burden more than recrystallization temperature in hot-working etc..The 2nd cooling suppression component can use described cold
But suppression component.In addition, the 1st cooling suppression component and the 2nd cooling suppression component can be discontinuous parts, and
And can also be continuous part.For example, can constantly suppress what be have dropped from mould using continuous cooling suppression component
Slab cooling is untill the strand is cut off.
The continuous casting apparatus can include described for cooling down between the mold and the cooling suppression component
The secondary cooling part of strand.Casting efficiency can be improved using the part.As secondary cooling part, it can include for example
Secondary cooling band with spray nozzle.
The continuous casting apparatus can include being used for guiding the dipping spray nozzle of the molten metal in tundish to mold, use
The optional equipments such as the block piece contacted in blocking molten metal with extraneous air.
The embodiment of casting method and casting device hereinafter, with reference to the accompanying drawings of the present invention.In this case, this hair
The bright embodiment being not limited in accompanying drawing.
Fig. 6 is the sectional view for representing conventional casting device.The casting device 101 of diagram is the casting device of vertical-type,
Including：Tundish 103, it is used for the molten metal 102 for keeping ferrous materials；Water cooling mold 104 made of iron；Lowering or hoisting gear 106,
It is used for the decrease speed for controlling strand 105.The molten metal 102 that tundish 103 is kept is from the bottom located at tundish 103
Nozzle 107 be injected into and be configured with the water cooling mold of slag 109 (mold) 104 as motlten metal stream 108.It is injected into water cooling
Molten metal 102 in mould 104 is cooled because being injected into water cooling mold 104, so as to pass through melt and solid phase from melt A
Mixture B state and further turn into solid phase C.Strand 105 as solid phase C is by lowering or hoisting gear 106 from water cooled mo(u)ld
Tool 104 is pulled out and is cooled.Casting device 101 can also include being used to block the screening that molten metal 102 is contacted with extraneous air
Block piece 110 and the strand shearing device (not shown) for cutting off strand 105.Strand 105 as solid phase C is because of cooling
And from surface internally from austenite structure to ferritic structure or pearlite transformation, and volume is expanded.From
The strand that volume starts in a period of being expanded into untill expansion terminates has not stretch-proof, not resistant to bending frangible property.If casting
The volume of base drastically expands, then when applying tensile stress for some reason in a period of untill expansion terminates, sometimes
Easily there is crackle in the core of strand.
Fig. 1 is the sectional view for the form for representing the casting device of the present invention.The casting device 1-1 of diagram is vertical-type
Casting device, including：Tundish 3, it is used for the molten metal 2 for keeping ferrous materials；Water cooling mold 4 made of iron；Lifting dress
6 are put, it is used for the decrease speed for controlling strand 5.In addition, additionally it is possible to including for blocking molten metal 2 and extraneous air
The block piece 10 of contact and the strand shearing device (not shown) for cutting off strand 5, this and the conventional casting shown in Fig. 6
Device 101 is identical.Casting device 1-1 and casting device 101 difference are, in addition to the case 11 for suppressing to cool down.
Fig. 5 is the figure for representing to cool down a form of suppression component.Fig. 5 (a) is the stereogram of case 11, and box main body 12 has
The spatial portion 13 of insertion box main body 12 along the vertical direction, the inwall of box main body 12 is covered by heat-insulating material 14.Such as Fig. 5 (b)~
Shown in Fig. 5 (d), the section of case 11 can be using shapes such as quadrangle, circle, polygons, can be using the section with strand 5
Corresponding variously-shaped of shape.As long as can prevent the core of strand 5 from crackle occur, then case 11 is not particularly limited
The length of above-below direction.
In casting device 1-1, the molten metal 2 that tundish 3 is kept is done from the nozzle 7 of the bottom located at tundish 3
Motlten metal stream 8 is injected into the water cooling mold 4 for being configured with slag 9.The molten metal 2 of water cooling mold 4 is injected into because being injected into water
Cold mold 4 and be cooled, so as to further turn into solid phase C by the mixture B of melt and solid phase state from melt A.Into
For solid phase C strand 5 because of cooling from surface internally from austenite structure to ferritic structure or pearlite transformation, and
And volume is expanded.Covered and suppressed in a period of being expanded into since volume untill expansion terminates by using case 11
Strand 5 cool down, so as to suppress to cause the volume of strand 5 drastically to expand because of cooling.Thereby, it is possible to prevent strand 5
There is crackle in core.The heat-insulating material 14 of case 11 is not contacted with strand 5, there are space 15.Strand 5 is by lowering or hoisting gear 6
Pulled out from water cooling mold 4 and case 11.
Fig. 2 is the sectional view for the casting device for representing the form different from Fig. 1.The casting device 1-2 of diagram includes casting
Device 1-1 apparatus structure, in addition also includes being used for the case 16 of suppression cooling and is cut off for the strand for cutting off strand 5
Device 17.Case 16 be used for suppress until covered and change by case 11 end strand 5 cut off by strand shearing device 17 untill
Cooling in period.The strand 5 cut off is heated to tie again thereby, it is possible to mitigate in hot-working of ensuing process etc.
Burden more than brilliant temperature.These, it is preferred to, case 16 is to suppress the cooling of the cut-off strand of the side of lowering or hoisting gear 6
And set.Thereby, it is possible to further mitigate the burden discussed above reheated to strand.The structure of case 16 and Fig. 4 institutes
The case 11 shown similarly has the spatial portion of insertion case 16 along the vertical direction, and the inwall of case 16 is covered by heat-insulating material.Also,
The section of case 16 can be using corresponding with the cross sectional shape of strand 5 variously-shaped.As long as can suppress until strand 5 is cast
Cooling in a period of untill the cut-out of base shearing device 17, then be not particularly limited the length of the above-below direction of case 16.Case 16
Heat-insulating material 18 is not contacted with strand 5, there are space 19.In fig. 2, provided with interval between case 11 and case 16, if but not having
There is interval, then can more efficiently suppress cooling.In addition, the present invention casting device also can be as shown in Figure 3 casting dress
The case 20 that 1-3 includes making case 11 and case 16 be integrally formed in the vertical direction like that is put, rather than including case 11 and case
16.According to case 20, then it can prevent the core of strand 5 from crackle occur, and the strand 5 after can suppressing is cooled down.
Fig. 4 is the sectional view for the casting device for representing the form different from Fig. 1~Fig. 3.The casting device 1-4 bags of diagram
Casting device 1-1 apparatus structure is included, in addition also includes being used to cool down the two of strand 5 between water cooling mold 4 and case 11
Secondary cooling zone 21.Strand 5 can be cooled down using secondary cooling band 21 before just suppressing cooling.As a result, it is possible to shorten cold
But during strand 5, therefore, it is possible to improve casting efficiency.
As described above, using the casting method and casting device of the present invention, can prevent in casting process in strand
Center portion separates existing crackle.
【Embodiment】
Hereinafter, the present invention is specifically described by showing embodiment etc., but the present invention is not limited to these embodiments
Deng.
[embodiment 1]
Cast using the casting device shown in Fig. 1.Molten metal is kept in tundish, to being provided with fusing in advance
Slag water cooling mold in injection molten metal.Strand is formed using water cooling mold cooling molten metal, lifting is utilized
Device pulls out strand from the bottom of water cooling mold.Using the strand pulled out for suppressing the case of cooling to suppress from water cooling mold because
Heat release and cool down.The injection rate injected with molten metal in water cooling mold correspondingly pulls out strand out of water cooling mold, so that will
The metal bath surface of molten metal in water cooling mold is maintained at the constant position of the entrance 150mm on the lower than water cooling mold.It is molten
The composition of slag is shown in Table 1 below.Molten metal uses the molten metal suitable with Japanese JIS SKD11.The composition of molten metal
It is shown in Table 2 below.The shape of the inside of water cooling mold is that section is that square (vertical 400mm, horizontal 400mm), length are 400mm
Cubic shaped.Case is by heat-insulating shield of the thickness for 50mm as shown in Fig. 5 (a), (b) by the inwall of box main body made of iron
The case of covering, the spatial portion with the insertion case along the vertical direction, the section of the case is square shape.Square
While being 460mm, the case is configured to be provided with 30mm gap between the surface of strand.The height of case is 1000mm, and case enters
Mouthful configuration is in the position than metal bath surface 1300mm on the lower, and the outlet configuration of case is in the position than metal bath surface 2300mm on the lower
Put.The thickness of slag is set to 50mm, the temperature of molten metal is set to 1500 DEG C, casting speed is set to 35kg/ points
(31.2mm/ points), and cast with this untill length turns into 3m.
【Table 1】
Slag constitutes (quality %)
| CaO | Al2O3 | CaF2 | SiO2 |
| 36 | 27 | 27 | 10 |
【Table 2】
Molten metal constitutes (quality %)
| Steel clock | C | Si | Mn | Cr | Mo | W | V | Fe |
| SKD11 | 1.50 | 0.30 | 0.40 | 12.0 | 1.0 | - | 0.3 | Remainder |
[embodiment 2]
As water cooling mold, the columned mould that interior shape is internal diameter 450mm, length 400mm is used.Also, such as
Shown in Fig. 5 (c), case uses such case：The case is to cover the inwall of box main body made of iron for 50mm heat-insulating shield by thickness
Lid, the case has the spatial portion of the insertion case along the vertical direction, and the section of the case is circular shape.The case it is interior
Footpath is 510mm, and the case is configured to be provided with 30mm gap between the surface of strand.The height of case is 1000mm, the entrance of case
Configure in the position than metal bath surface 1300mm on the lower, the outlet configuration of case is in the position than metal bath surface 2300mm on the lower
Put.Like this, be outside circular strand, the shape for changing water cooling mold and case to manufacture section, divided by addition, using with
The identical condition of embodiment 1 is cast.
[comparative example 1]
In addition to without using case, cast using condition same as Example 1.
[comparative example 2]
In addition to without using case, cast using condition same as Example 2.
Fig. 7 be below slab cooling to the room temperature that will be cast out by embodiment after, to the cross section on casting direction and
Cross-section photograph obtained from being shot through the longitudinal section of central axis.Fig. 7 (A) is the result of embodiment 1, Fig. 7 (A)
(a) be cross section cross-section photograph, (b) of Fig. 7 (A) is the cross-section photograph of longitudinal section.Fig. 7 (B) is the knot of embodiment 2
Really, similarly, (a) of Fig. 7 (B) is the cross-section photograph of cross section, and (b) of Fig. 7 (B) is the cross-section photograph of longitudinal section.By
Cross-section photograph in Fig. 7 is understood, in any result in embodiment 1 and embodiment 2, does not find the kernel of section portion of strand
The crackle divided.
Fig. 8 is after representing below slab cooling to the room temperature that will be cast out by comparative example, to cross section and through center
Cross-section photograph obtained from the longitudinal section of axis is shot.Fig. 8 (A) is the result of comparative example 1, and (a) of Fig. 8 (A) is
The cross-section photograph of cross section, (b) of Fig. 8 (A) is the cross-section photograph of longitudinal section.Fig. 8 (B) is the result of comparative example 2, equally
Ground, (a) of Fig. 8 (B) is the cross-section photograph of cross section, and (b) of Fig. 8 (B) is the cross-section photograph of longitudinal section.In Fig. 8
Cross-section photograph is understood, in any result in comparative example 1 and comparative example 2, finds the kernel of section part presence in strand
Crackle.
[embodiment 3]
Compared with Example 1, the larger strand in section is cast in embodiment 3.
Using the slag of the composition shown in table 3, the shape of the inside of water cooling mold use section for rectangle (vertical 400mm,
Horizontal 600mm), length be 400mm rectangular shape.Case is analogous to Fig. 5 (a), Fig. 5 (b) shape, and being will be made of iron
The case that the inwall of box main body is covered by thickness for 50mm heat-insulating shield, the spatial portion with the insertion case along the vertical direction,
The section of the case is vertical 460mm, horizontal 660mm rectangular shape, and the height of case is 1000mm.Using casting speed as 30mm/
The speed divided is casted into 400 minutes.Other conditions use condition same as Example 1.
【Table 3】
Slag constitutes (quality %)
| CaO | Al2O3 | CaF2 | SiO2 |
| 30 | 15 | 25 | 30 |
Fig. 9 is by after below the slab cooling cast out by embodiment to room temperature, enter to the cross section on casting direction
Cross-section photograph obtained from row is shot.From the cross-sectional picture in Fig. 9, casting is not found in the result of embodiment 3 yet
The crackle of the kernel of section part of base.
According to result above, it is able to confirm that, suppresses by using the Bin covering strand with heat-insulating material from body
Product starts the cooling of the strand in a period of being expanded into untill expansion terminates, so as to suppress the body for causing strand because of cooling
Product drastically expands, as a result, can prevent the kernel of section part of strand from crackle occur.
Industrial applicability
Using the present invention, it can prevent that crackle occurs in the core of strand in casting process, therefore be industrially
Useful.
Description of reference numerals
1-1, casting device；1-2, casting device；1-3, casting device；1-4, casting device；2nd, molten metal；3、
Tundish；4th, water cooling mold；5th, strand；6th, lowering or hoisting gear；7th, nozzle；8th, motlten metal stream；9th, slag；10th, block piece；11、
Case；12nd, box main body；13rd, spatial portion；14th, heat-insulating material；15th, space；16th, case；17th, strand shearing device；18th, heat-insulating material；
19th, space；20th, case；21st, secondary cooling band；101st, casting device；102nd, molten metal；103rd, tundish；104th, water cooled mo(u)ld
Tool；105th, strand；106th, lowering or hoisting gear；107th, nozzle；108th, motlten metal stream；109th, slag；110th, block piece；A, melt；
B, melt and solid phase mixture；C, solid phase.
Claims (10)
1. a kind of casting method, the casting method at least includes refrigerating work procedure, in the refrigerating work procedure, cooling, which has, does not solidify portion
With the strand of the solidified shell for the peripheral part for not solidifying portion positioned at this, wherein,
The refrigerating work procedure includes cooling and suppresses process, in the cooling suppresses process, suppresses described using suppression component is cooled down
The cooling of strand,
The material of the strand is ferrous materials, and the cooling, which suppresses process, includes the 1st cooling suppression process, in the 1st cooling
Suppress in process, the strand is suppressed during the austenite structure of the strand is to ferritic structure or pearlite transformation
Cooling, prevent the core of the strand from crackle occur when being applied with tensile stress.
2. casting method according to claim 1, wherein,
The cooling suppression component at least includes the heat-insulating material with heat resistance.
3. casting method according to claim 1, wherein,
The casting method is continuous casing, is at least included：
Injection process, in the injection process, mold is injected by the molten metal of ferrous materials；
Strand formation process, in the strand formation process, is cooled down by cooling down the mold to the molten metal,
So as to form the strand of the solidified shell with the peripheral part for not solidifying portion and not solidifying portion positioned at this；
Removal process, in the removal process, the strand is taken out from the mold；
The refrigerating work procedure,
The refrigerating work procedure is the process for cooling down the strand after the removal process.
4. casting method according to claim 3, wherein,
The continuous casing also includes strand cut off operation, and the strand cut off operation is after the refrigerating work procedure, in the casting
The strand is cut off in base cut off operation, the cooling, which suppresses process, includes the 2nd cooling suppression process, cold the 2nd
But suppress in process, it is cold that suppression is carried out until being changed into untill the strand of ferritic structure or pearlitic structrure is cut off
But.
5. the casting method according to claim 3 or claim 4, wherein,
The continuous casing also includes being used to cool down the strand after the removal process and before the refrigerating work procedure
Secondary cooling process.
6. a kind of casting device, wherein,
The casting device at least includes：
Mold, it is used to cool down the molten metal being injected into, and does not solidify portion so as to be formed and had and does not solidify portion positioned at this
The strand of the solidified shell of peripheral part；
Suppression component is cooled down, it is used for the cold of the strand that suppression vertically declines from the mold bottom of the mold
But,
The material of the strand is ferrous materials, and the cooling suppression component includes the 1st cooling suppression component, the 1st cooling suppression
Part processed is used to suppress the strand during the austenite structure of the strand is to ferritic structure or pearlite transformation
Cooling.
7. casting device according to claim 6, wherein,
The cooling suppression component at least includes the heat-insulating material with heat resistance.
8. casting device according to claim 6, wherein,
The casting device is continuous casting apparatus, in addition to including the mold and the cooling suppression component, also at least
Including：
The molten metal is simultaneously injected the mold by container, its molten metal for being used to keep ferrous materials；
Control unit, it is used for the lower reduction of speed for the strand that control vertically declines from the mold bottom of the mold
Degree.
9. casting device according to claim 8, wherein,
The continuous casting apparatus also include strand cut component, the strand cut component be used for be changed into ferritic structure or
The strand of pearlitic structrure is cut off, and the cooling suppression component includes the 2nd cooling suppression component, the 2nd cooling suppression
Part processed is used to suppress in a period of untill the strand for being changed into ferritic structure or pearlitic structrure is cut off
Cooling.
10. the casting device according to claim 8 or claim 9, wherein,
The continuous casting apparatus also includes being used to cool down the strand between the mold and the cooling suppression component
Secondary cooling part.
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| CN108746521B (en) * | 2018-06-08 | 2020-05-19 | 辽宁科技大学 | Vertical continuous casting multistage anti-radiation heat preservation device |
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| CN1130113A (en) * | 1994-09-30 | 1996-09-04 | 株式会社日立制作所 | Thin slab continuous casting machine and thin slab continuous casting method |
| CN1606629A (en) * | 2001-11-15 | 2005-04-13 | 蒂森克鲁普特殊钢特尔尼股份公司 | In-line process for the recrystallization of solidified coarse strips in carbon steel and in low-alloyed steel and so obtainable strips having a highly checked microstructure |
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| DE2042546A1 (en) * | 1970-08-27 | 1972-03-02 | Zentralnyj nautschno lssledowatelskij Institut tschernoj metallurgn lmenti I P Bardina, Moskau | Reduction of cooling of continuous castings - in secondary cooling zo |
| JPS5268030A (en) * | 1975-12-03 | 1977-06-06 | Nippon Steel Corp | Method of manufacturing cast piece with superior surface property by curved continuous casting machine |
| JPS54180416U (en) * | 1978-06-09 | 1979-12-20 | ||
| JP2002283018A (en) * | 2001-03-23 | 2002-10-02 | Nippon Steel Corp | Method and apparatus for cooling slab in multi-size continuous casting facility for bloom and billet |
| KR100544430B1 (en) * | 2001-04-10 | 2006-01-24 | 주식회사 포스코 | Manufacturing method of continuous casting slab of high Ni alloy |
| JP2002321039A (en) * | 2001-04-26 | 2002-11-05 | Nippon Steel Corp | Continuous cast slab, method for producing the same, and continuous casting equipment |
| JP2003039142A (en) * | 2001-07-25 | 2003-02-12 | Kobe Steel Ltd | MANUFACTURING METHOD FOR Ni-CONTAINING STEEL |
| US7617863B2 (en) * | 2006-08-11 | 2009-11-17 | Rti International Metals, Inc. | Method and apparatus for temperature control in a continuous casting furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1130113A (en) * | 1994-09-30 | 1996-09-04 | 株式会社日立制作所 | Thin slab continuous casting machine and thin slab continuous casting method |
| CN1606629A (en) * | 2001-11-15 | 2005-04-13 | 蒂森克鲁普特殊钢特尔尼股份公司 | In-line process for the recrystallization of solidified coarse strips in carbon steel and in low-alloyed steel and so obtainable strips having a highly checked microstructure |
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