CN202146980U - Device capable of improving the macro segregation and loose of a large-size steel casting - Google Patents

Device capable of improving the macro segregation and loose of a large-size steel casting Download PDF

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Publication number
CN202146980U
CN202146980U CN201120170144U CN201120170144U CN202146980U CN 202146980 U CN202146980 U CN 202146980U CN 201120170144 U CN201120170144 U CN 201120170144U CN 201120170144 U CN201120170144 U CN 201120170144U CN 202146980 U CN202146980 U CN 202146980U
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China
Prior art keywords
metal
ingot
metal sleeve
grillage
segregation
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Expired - Fee Related
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CN201120170144U
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Chinese (zh)
Inventor
李强
邹宗树
张作良
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Northeastern University China
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Northeastern University China
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Abstract

The utility model provides a device capable of improving the macro segregation and loose of a large-size steel casting, comprising an ingot mold and a coagulation accelerating component for accelerating the coagulation of a metal liquid, which is concentric with the ingot mold and arranged in the ingot mold, wherein the coagulation accelerating component comprises a metal sleeve and a metal plate rack, the metal plate rack is fixed in the metal sleeve, the lower end of the metal plate rack extends out the lower end of the metal sleeve and is connected with the bottom of the ingot mold and the upper end of the metal plate rack does not exceed the upper end of the metal sleeve. The nucleation sites in the ingot is added, the existing nucleation path of the ingot is changed, the coagulation speed of the molten steel in the ingot is effectively quickened, the inner part of the ingot is prevented from directly resulted into the area segregation to form thermosolutal convection, therefore the segregation of the ingot is controlled. Simultaneously, the coagulation speed of the steel casing is accelerated and the loose is prevented.

Description

A kind of large-scale steel-casting gross segregation and loose device of improving
Technical field
The utility model relates to a kind of device that can improve segregation of large-scale steel-casting central area and the formation cast metals of loosening.
Background technology
Chinese in recent years weight equipment development of manufacturing is rapid, and is also vigorous all the more for the demand of heavy casting and forging, particularly Aeronautics and Astronautics, required key member and the section bar of the great model project of navigation, and nuclear power, energy core material and member etc.To be example to the more nuclear power generating equipment of heavy casting and forging demand, expect the year two thousand twenty, nuclear power accounts for the ratio of total installed capacity of electricity capacity and will heighten more than 8% by 4%.Calculate in view of the above, with the market demand that drives 7,000 hundred million~7,500 hundred million yuan of nuclear power equipment manufactures.In the used steel of this series products quite a few produced by process such as the cogging of large-scale steel ingot process, calendering, forgings, and the quality of its end product quality is closely related with the forge piece quality that is made by steel ingot.Obtain high-quality forge piece; Must control mass defect intrinsic in the steel ingot such as component segregation, tissue looseness etc.; This is because the existence of segregation thing and the embrittlement that tissue looseness must cause the line of segragation; Form the formation of crack in the steel ingot, can obviously reduce the mechanical property of ingot casting and foundry goods, and be difficult to eliminate through subsequent techniques such as heat treatments.
The regional segregation that produces in the large-scale steel-casting process of setting is the quality of severe exacerbation steel-casting not only, and has a strong impact on economic benefit.Whole process of setting must be the nuclei of crystallization that solid phase in liquid phase, occurs, and nucleus is constantly grown up when consuming liquid metal gradually, and the tissue and the quality of large-scale steel-casting are being controlled in the variation that takes place in this process of setting.In process of setting, become the big mushy zone of viscosity from liquid with small viscosity, be frozen into solid then, volume is also constantly changing.If liquid metals can not be continuously to the regional by-carriage that is solidifying, then because the variation of this volume will produce the inner tissue looseness of steel ingot.On the other hand, the choosing of metal in process of setting divides crystallization, causes inevitably occurring in the crystal segregation.Segregation is divided into two kinds: a kind of is the microsegregation that the interior chemical composition inequality of grain size range (comprising crystal boundary) causes; Another kind is the gross segregation that uneven chemical components causes on the whole section of strand.Wherein macroscopical component segregation is a kind of casting flaw that often runs in ingot casting, particularly alloy cast ingot and the heavy castings production.
In order to satisfy the wilderness demand of market to high-quality large-scale steel-casting, it is not only significant with loose two kinds of defectives to explore the regional segregation that a kind of method overcomes mechanism of ingot structure, and has very important real value.Chinese scholars has been carried out number of research projects for this reason; Wherein the someone proposes in the large-scale steel ingot casting process; In steel ingot, add steel ball; Increase the inner forming core particle of steel ingot, accelerate the cooling velocity of steel ingot, thereby obtain the method for low-segregation large-sized steel ingot, but the defective of this method is that the position of steel ball in the steel ingot die cavity is uncontrollable; Also the someone has proposed precasting breather line in ingot mould middle and lower part and ingot mould chassis; Feeding compressed air then cools off; Improved the cooling velocity of large-scale steel ingot greatly, suppress the method for the various segregations of large-scale steel ingot, but this method has been to the inhibition poor effect of center segregation and center porosity.
The utility model content
The purpose that the utility model is created is to design a kind of be used to improve foundry goods gross segregation and loose device; Increase the quantity of thin equiax crystal with this; So that solve problems such as the gross segregation of foundry goods chemical composition, loose and foundry goods utilization rate be low, thereby produce the lower segregation of chemical composition, loose foundry goods less.
The utility model provides a kind of device that forms cast metals, and said device comprises ingot mould and is arranged on inner being used to of said ingot mould with one heart with ingot mould and quickens the short member that coagulates that molten metal solidifies.Wherein, The said short member that coagulates comprises metal sleeve and metal grillage; Said metal grillage is fixed in the metal sleeve, and the lower end of metal grillage stretches out the lower end of metal sleeve and be connected with the bottom of said ingot mould, and the upper end of metal grillage does not exceed the upper end of metal sleeve.
In an embodiment of the utility model; The material of said metal sleeve and said metal grillage can with treat the casting metals liquid phase with; The component of perhaps said metal sleeve and said metal grillage can with treat the casting metals liquid phase with and said metal sleeve and said metal grillage in the content of easy segregation element P and S by weight percentage respectively than treating that the corresponding element content in the casting metals liquid is low at least by 0.01%, and non-easy segregation element C, Si and Mn in said metal sleeve and the said metal grillage are respectively than treating that the corresponding element content in the casting metals liquid hangs down 1%~2%.
In an embodiment of the utility model, the cross section of said metal sleeve can for circular, oblateness or limit number more than or equal to 3 polygon.
In an embodiment of the utility model, the height of said metal sleeve can be 3/5~4/5 of ingot mould cavity height.
In an embodiment of the utility model, the height that the part of said metal sleeve lower end is stretched out in the lower end of said metal grillage can be 80mm~100mm.
In an embodiment of the utility model, the thickness of said metal sleeve and metal grillage can for the ingot mould internal diameter 1/500~1/200 and be at least 1mm.
In an embodiment of the utility model, said metal grillage can be welded by the metallic plate more than or two, and its cross section can be "-" shape, "+" shape, " T " shape, " Y " shape or " well " shape.
In an embodiment of the utility model, the upper end of said metal grillage can be concordant with the upper end of metal sleeve.
Compared with prior art; The beneficial effect of the utility model is: through the short member of being made up of metal sleeve and metal grillage that coagulates is set; Increase the inner forming core particle of foundry goods, changed the original forming core path of foundry goods, accelerated the setting rate of foundry goods interior metal liquid effectively; Improve heat-solute free convection that foundry goods inside directly causes regional segregation to form, thereby reach the purpose of control foundry goods segregation; And, owing to casting solidification speeds up, thus prevented to form tiny cavity between the brilliant arm at interdendritic and dendrite because of microcosmic feeding passage stops up in the zone slowly at casting solidification, thus prevented loose formation.
Description of drawings
Fig. 1 is the schematic main cutaway view according to the device of the formation cast metals of the utility model exemplary embodiment.
Fig. 2 is the schematic plan according to the device of the formation cast metals of the utility model exemplary embodiment.
Reference numeral: 1 is that ingot mould, 2 is that metal sleeve, 3 is the metal grillage.
The specific embodiment
Comprise ingot mould and be arranged on inner being used to of said ingot mould with one heart according to the device of the formation cast metals of the utility model and quicken the short member that coagulates that molten metal solidifies with ingot mould.Wherein, The said short member that coagulates comprises metal sleeve and metal grillage; Said metal grillage is fixed in the metal sleeve, and the lower end of metal grillage stretches out the lower end of metal sleeve and be connected with the bottom of said ingot mould, and the upper end of metal grillage does not exceed the upper end of metal sleeve.
When using device casting metals liquid according to the utility model to form ingot casting, directly in this device, inject molten metal, to implement normal casting and get final product, when treating that casting is accomplished, short member is with fixed attention also cast in ingot casting.
The cardinal principle of the utility model is described below:
In casting field, the basic reason that causes regional segregation is that choosing divides crystallization, and when promptly molten metal solidified, the metals that impurity is few, purity is high such as carbon containing, phosphorus, sulphur at first began crystallization because fusing point is higher, make the liquid of post crystallization contain more impurity.Simultaneously because temperature that casting process and process of setting caused and concentration difference etc. make the molten metal of process of setting be in flow regime always, thereby with enrichment the molten metal of solute take not solidified zone to.And because the existence of metal sleeve and metallic plate; Increased the inner forming core particle of foundry goods; Changed the original forming core path of foundry goods; Accelerate the setting rate of foundry goods interior metal liquid effectively, improve heat-solute free convection that foundry goods inside directly causes regional segregation to form, thereby reach the purpose of control foundry goods segregation.Loose is that casting solidification stops up the tiny cavity that between the brilliant arm of interdendritic and dendrite, forms in the zone slowly because of microcosmic feeding passage; When adding metal sleeve or metallic plate; Accelerate casting solidification speed, improved segregation, also just prevented loose formation simultaneously.
To combine accompanying drawing to describe the exemplary embodiment of the utility model below.For the sake of clarity, can exaggerate or dwindle the size of each member in the accompanying drawing.
Embodiment 1
Fig. 1 is the schematic main cutaway view according to the device of the formation cast metals of the utility model exemplary embodiment.Fig. 2 is the schematic plan according to the device of the formation cast metals of the utility model exemplary embodiment.
As illustrated in fig. 1 and 2, comprise ingot mould 1 and be arranged on ingot mould 1 inner being used to one heart according to the device of the formation cast metals of the utility model and quicken the short member that coagulates that molten metal solidifies with ingot mould 1.Wherein, The short member that coagulates comprises metal sleeve 2 and metal grillage 3; Metal grillage 3 is fixed in the metal sleeve 2, and the lower end of metal grillage 1 stretches out the lower end of metal sleeve 2 and be connected with the bottom of ingot mould 1, and the upper end of metal grillage 3 does not exceed the upper end of metal sleeve 2.Here, the die cavity of ingot mould is the large round billet type, and the inner cavity size height of ingot mould is 2000mm, and diameter is 800mm.
Here, in order to guarantee slab quality, the material of metal sleeve and metal grillage with treat the casting metals liquid phase with.
In the present embodiment, the cross section of metal sleeve is circular.The height of metal sleeve is 4/5 of an ingot mould cavity height.The height that the part of said metal sleeve lower end is stretched out in the lower end of metal grillage is 100mm.The thickness of metal sleeve and metal grillage is 1/500 of ingot mould internal diameter, is 1.6mm.
In the present embodiment, the metal grillage is welded by two strip metal plates, and its cross section is "+" shape.In the present embodiment, the upper end of metal grillage is concordant with the upper end of metal sleeve.
Embodiment 2
Present embodiment and embodiment 1 are basic identical, and difference is:
In the present embodiment; The component of metal sleeve and metal grillage with treat that casting metals liquid is basic identical; And easy segregation element P in metal sleeve and the metal grillage and the content of S are by weight percentage respectively than treating that the corresponding element content in the casting metals liquid is low by 0.01%, and non-easy segregation element C, Si and Mn in metal sleeve and the metal grillage are respectively than treating that the corresponding element content in the casting metals liquid hangs down about 1%; The cross section of metal sleeve is a quadrangle; The height of metal sleeve is 3/5 of an ingot mould cavity height; The height that the part of said metal sleeve lower end is stretched out in the lower end of metal grillage is 80mm; The thickness of metal sleeve and metal grillage is 1/200 of ingot mould internal diameter, is 4mm; The metal grillage is made up of a strip metal plate, and is welded on metal sleeve inside, and its cross section can be "-" shape.
Embodiment 3
As depicted in figs. 1 and 2, the steel ingot rising head adopts insulated feeder, and the molten steel tapping temperature is 1630 ℃, and cast ingot mould die cavity is a large round billet, and the inner cavity size height is 2000mm, and diameter is 800mm.Turn over the bag cast, 1600 ℃ of pouring temperatures charge into argon gas before the cast in the die cavity of ingot mould; Under argon shield, pour into a mould, by weight percentage, the target steel grade in the present embodiment is No. 45 steel; Its composition is: C:0.46%, Si:0.26%, Mn:0.70%; P:0.015%, S:0.02%, Fe: surplus.At the fixing short member that coagulates that is welded by metal grillage and metal sleeve of ingot mould inner bottom, its composition is before the cast: C:0.35%, and P:0.01%, S:0.01%.The metal sleeve diameter is 400mm, and metal grillage thickness is 3mm, and the lower end of metal grillage exceeds the about 90mm in lower end of metal sleeve, and the metal sleeve height is 4/5 of an ingot mould internal cavities height, after cast finishes, fills thermal-insulating covering agent in the rising head top; Ingot steel casting finishes back 8 hours shake outs.Keep its as-cast condition to carry out sufur printing and low power metallographic test behind the shake out.In the present embodiment, metal sleeve is reeled to weld then by a rectangular steel plates and is formed.
Embodiment 4
Cast steel ingot mould form is a large round billet, and inner cavity size is high 2400mm, and diameter is 1200mm.Turn over the bag cast, the steel ingot rising head adopts insulated feeder, and molten steel high temperature is come out of the stove, and tapping temperature is 1630 ℃, turns over the bag cast, 1620 ℃ of pouring temperatures.Cast is applying argon gas in die cavity before, under argon shield, pours into a mould, and by weight percentage, the target steel grade in the present embodiment is No. 45 steel, and its composition is: C:0.46%, Si:026%, Mn:0.70%, P:0.015%, S:0.02%, Fe surplus.The preceding center at ingot mould of cast inserted a short member that coagulates that is welded by metal grillage and metal sleeve; Its composition is: C:0.35%; P:0.01%, S:0.01%, sleeve diameter are 100mm; The thickness that constitutes the steel plate of metal grillage is 4mm, and the lower end of metal grillage exceeds metal sleeve 85mm.The height of metal sleeve is 4/5 of an ingot mould internal cavities height, after cast finishes, fills thermal-insulating covering agent in the rising head top; Ingot steel casting finishes back 8 hours shake outs.Keep its as-cast condition to carry out sufur printing and low power metallographic test behind the shake out.
Comparative example
Cast steel ingot mould form is a large round billet, and inner cavity size is high 2400mm, and diameter is 1200mm; Turn over the bag cast; 1600 ℃ of pouring temperatures do not have fixing metal sleeve in the foundry goods die cavity before the cast, steel ingot cools off naturally; The intermediate cross-section of steel ingot exists " A " type and the segregation of " V " type clearly, and there is significant difference in steel ingot top and bottom carbon content.
In sum; The utility model comes steel ingot interior metal liquid is effectively cooled off through the same or analogous short member that coagulates of composition and molten metal to be cast is set; Greatly reduce the segregation degree of steel ingot, produced the uniform high-performance large-scale steel ingot of each position composition.
Although combined exemplary embodiment to describe the utility model above, it should be appreciated by those skilled in the art that under the situation of spirit that does not break away from claim and limited and scope, can make various modifications and change to embodiment.

Claims (7)

1. device that forms cast metals; Comprise ingot mould, it is characterized in that the device of said formation cast metals comprises that also being arranged on inner being used to of said ingot mould with one heart with ingot mould quickens the short member that coagulates that molten metal solidifies; The said short member that coagulates comprises metal sleeve and metal grillage; Said metal grillage is fixed in the metal sleeve, and the lower end of metal grillage stretches out the lower end of metal sleeve and be connected with the bottom of said ingot mould, and the upper end of metal grillage does not exceed the upper end of metal sleeve.
2. the device of formation cast metals as claimed in claim 1 is characterized in that, the cross section of said metal sleeve is circular, oblateness or limit number more than or equal to 3 polygon.
3. the device of formation cast metals as claimed in claim 1 is characterized in that, the height of said metal sleeve is 3/5~4/5 of an ingot mould cavity height.
4. the device of formation cast metals as claimed in claim 1 is characterized in that, the height that the part of said metal sleeve lower end is stretched out in the lower end of said metal grillage is 80mm~100mm.
5. the device of formation cast metals as claimed in claim 1 is characterized in that, the thickness of said metal sleeve and metal grillage be the ingot mould internal diameter 1/500~1/200 and be at least 1mm.
6. the device of formation cast metals as claimed in claim 1 is characterized in that, said metal grillage is welded by the metallic plate more than or two, and its cross section is "-" shape, "+" shape, " T " shape, " Y " shape or " well " shape.
7. the device of formation cast metals as claimed in claim 1 is characterized in that, the upper end of said metal grillage is concordant with the upper end of metal sleeve.
CN201120170144U 2011-05-23 2011-05-23 Device capable of improving the macro segregation and loose of a large-size steel casting Expired - Fee Related CN202146980U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104148597A (en) * 2014-08-06 2014-11-19 辽宁科技学院 Die and method for pouring iron alloy with liquid formed original slags serving as die bush
CN104259441A (en) * 2014-09-22 2015-01-07 辽宁科技大学 Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field
CN104475693A (en) * 2014-12-08 2015-04-01 辽宁科技大学 Reduction casting compositing method and device for large iron ingots
CN105312513A (en) * 2015-11-26 2016-02-10 辽宁科技大学 Method for mould core integrated composite casting of large-scale alloy steel ingots
CN106825469A (en) * 2017-01-23 2017-06-13 上海大学 The method for reducing the casting metal inside degree of superheat
CN106862538A (en) * 2017-02-10 2017-06-20 上海电机学院 A kind of casting method for improving ingot casting grain size and microstructure segregation

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104148597A (en) * 2014-08-06 2014-11-19 辽宁科技学院 Die and method for pouring iron alloy with liquid formed original slags serving as die bush
CN104259441A (en) * 2014-09-22 2015-01-07 辽宁科技大学 Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field
CN104259441B (en) * 2014-09-22 2017-04-19 辽宁科技大学 Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field
CN104475693A (en) * 2014-12-08 2015-04-01 辽宁科技大学 Reduction casting compositing method and device for large iron ingots
CN105312513A (en) * 2015-11-26 2016-02-10 辽宁科技大学 Method for mould core integrated composite casting of large-scale alloy steel ingots
CN106825469A (en) * 2017-01-23 2017-06-13 上海大学 The method for reducing the casting metal inside degree of superheat
CN106825469B (en) * 2017-01-23 2019-10-11 上海大学 The method for reducing casting metal over-heat inside degree
CN106862538A (en) * 2017-02-10 2017-06-20 上海电机学院 A kind of casting method for improving ingot casting grain size and microstructure segregation

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