CN201342480Y - Inner cooling device for prohibiting macrosegregation of large-sized steel ingot - Google Patents
Inner cooling device for prohibiting macrosegregation of large-sized steel ingot Download PDFInfo
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- CN201342480Y CN201342480Y CNU2008202195818U CN200820219581U CN201342480Y CN 201342480 Y CN201342480 Y CN 201342480Y CN U2008202195818 U CNU2008202195818 U CN U2008202195818U CN 200820219581 U CN200820219581 U CN 200820219581U CN 201342480 Y CN201342480 Y CN 201342480Y
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Abstract
The utility model relates to an inner cooling device for prohibiting the macrosegregation of a large-sized steel ingot, in particular to a device for prohibiting the macrosegregation of a large-sized steel ingot by adding steel rods, which belongs to the low-segregation large-sized steel ingot manufacturing technology. Before the large-sized steel ingot is cast, at least a round of steel rods are preset in a steel ingot cavity, to improve the particle nucleation in the ingot and the cooling speed of the ingot, so as to prohibit solute convection, prevent the formation of segregation channels, and obtain the low-segregation steel ingot with uniform components and fine tissues. The inner cooling device for prohibiting the macrosegregation of the large-sized steel ingot can solve the problems of non-uniform chemical components, large grain size, low melting point, the A, V and other types of macrosegregation of low-density elements (C, P and the like), low steel ingot utilization rate and the like of the large-sized ingots, so as to produce the low- segregation large-sized steel ingot with uniform chemical components. The inner cooling device for prohibiting the macrosegregation of the large-sized steel ingot is suitable for sand and metal-based large-sized steel ingots with all models and made of all materials.
Description
Technical field
The utility model relates to a kind of interior device for cooling that suppresses gross segregation in large-sized steel ingot, specifically by adding the device of rod iron inhibition gross segregation in large-sized steel ingot, belongs to the low-segregation large-sized steel ingot manufacturing technology.The utility model is applicable to the sand mold of all specifications, all materials and the large-scale steel ingot manufacturing of metal mold.
Background technology
In recent years along with China's power industry, the fast development of nuclear industry and petro chemical industry, increasing to the demand of heavy casting and forging, also the quality requirements to heavy casting and forging is more and more higher simultaneously.Large-scale steel ingot is the product in advance of heavy casting and forging, and its quality is particularly important to improving the heavy casting and forging quality.The setting time of large-scale steel ingot is very long (according to steel ingot tonnage difference, do not wait in tens hours to up to a hundred hours), make the steel ingot chemical composition have adequate time to spread, cause the zones of different uneven chemical components, cause gross segregation and microsegregation, final set regional organization is thick.To the subsequent treatment of steel ingot normally: to steel ingot chop off the head (top) truncate (bottom), only get middle part composition uniform parts, this has seriously influenced the utilization rate of steel ingot.
The segregation problem of large-scale steel ingot is researcher and business circles concern extremely.Though form in segregation and to obtain certain progress aspect the mechanism, as the segregation type, determining etc. of segregation position made slow progress aspect the segregation control measure, almost do not have effective measures can suppress gross segregation.
The utility model content
The purpose of this utility model is to provide a kind of interior device for cooling that suppresses gross segregation in large-sized steel ingot, to solve the large-scale steel ingot uneven chemical components, crystal grain is thick, gross segregations such as " A " type of low melting point, low-density element (C, P etc.) and " V " type, problems such as the steel ingot utilization rate is low, thus produce the uniform low-segregation large-sized steel ingot of chemical composition.
The technical solution of the utility model is:
A kind of interior device for cooling that suppresses gross segregation in large-sized steel ingot, this device is provided with rod iron, ingot mould, forms the steel ingot die cavity in the ingot mould, and rod iron places the steel ingot die cavity.
The interior device for cooling of described inhibition gross segregation in large-sized steel ingot, rod iron circlewise, cross bar one side of cross shaped head connects vertical rod, the center of cross bar opposite side with vertically be connected rod iron all around, rod iron hangs in the steel ingot die cavity by vertical rod.
The interior device for cooling of described inhibition gross segregation in large-sized steel ingot, the ingot case top of chamber is provided with insulating riser sleeve, the inboard insulated feeder that forms of insulating riser sleeve, thermal-insulating covering agent is placed at the insulated feeder top.
The utility model has been developed a kind of inner-cooling method that suppresses gross segregation in large-sized steel ingot, comprises the steps:
1) before the large-scale steel ingot cast, arrange at least one circle rod iron in advance in the steel ingot die cavity, the rod iron addition is 0.3%～8.0% (preferable range is 0.8%～3.0%) of steel ingot blank (do not comprise running gate system, but comprise rising head) weight;
2) rod iron inside does not have casting flaw, any surface finish, and composition is identical with the steel ingot composition or close;
3) every rod iron diameter is 10～60mm, and length is 1/4～1/2 of ingot height degree;
4) rod iron carries out even preheating in heat-treatment furnace, and the rod iron final temperature is not less than 150 ℃, and the rod iron preheat temperature is generally 150 ℃～450 ℃;
5) the rod iron dispersed placement is in steel ingot die cavity circumference 1/4～1/2 radial position, and (preferable range is 50～250mm) distance from rising head root 20～450mm on the rod iron summit.
The utility model rod iron is the extrusion molding bar, and its inside does not have shrinkage cavity, loose, does not contain gas and field trash, and any surface finish does not contain any antirust agent or other greasy dirt; The rod iron composition is identical with the steel ingot composition or close, be that C, Si are identical with the steel ingot composition with the Mn constituent content or than low 1%～2% (percentage by weight) of steel ingot, steel ingot for the high-alloy steel composition, consider the requirement of cost and production cost aspect, rod iron can adopt carbon steel, alloying element is not done requirement, and impurity contents such as P, S to be lower than the requirement of steel ingot composition more than 0.01%.
In the utility model, large-scale steel ingot is meant 100～600 tons steel ingot, and the height of steel ingot is at 4000mm～7000mm.
The utlity model has following beneficial effect:
1. the utility model is a foundation with the large-scale steel ingot Computer simulation results, before the cast, in the steel ingot die cavity, arrange a circle or an a few circle rod iron in advance, increase the forming core particle of steel ingot inside, the cooling velocity of quickening steel ingot, can significantly improve the setting rate of large-scale steel ingot, shorten the time that the steel ingot solid-liquid two-phase region stops, the segregation of large-scale steel ingot is had the obvious suppression effect.Thereby, can suppress solute convection, prevent the formation of segregation passage and obtain composition evenly, the low segregation steel ingot of structure refinement.
2. the utility model uses rational smelting process to improve the molten steel degree of purity, adopt and reasonably preset the quick process for cooling of rod iron, make steel ingot chemistry homogenising, structure refinement, improved the steel ingot serviceability greatly, significantly alleviate steel ingot top normal segregation, bottom negative segregation, " A " type and the gross segregation of " V " type, improved the quality and the utilization rate of steel ingot.
3. the utility model is applicable to the manufacturing of the low-segregation large-sized steel ingot of various materials and tonnage.Utilize the low-segregation large-sized steel ingot of the utility model production to have high-performance, high stock utilization, characteristics cheaply, be easy to obtain customer acceptance,,, the output value more than tens yuan will be arranged in case be widely adopted because market potential is huge.
4. the utility model has designed insulated feeder; realized the feeding of steel ingot effectively; adopt argon shield in the casting process,, guaranteed the quality of low-segregation large-sized steel ingot by to adding the control of key process parameters such as rod iron position, size, length and mass fraction.
Description of drawings
Fig. 1 gross segregation in large-sized steel ingot schematic diagram; Among the figure, 8, the rising head segregated zone; 9, " A " type segregated zone; 10, " V " type segregated zone; 11 column crystals; 12 thin equiax crystal; 13 negative segregation bands.
Fig. 2 rod iron schematic diagram; Among the figure, 1 rod iron; 14 vertical rods; 15 cross bars.
Fig. 3 adds the steel ingot intermediate cross-section overall sulfur impression of rod iron 0.9%;
Fig. 4 the utility model suppresses the interior device for cooling schematic diagram of gross segregation in large-sized steel ingot; Among the figure, 1 rod iron; 2 thermal-insulating covering agents; 3 insulating riser sleeves; 4 steel ingot die cavities; 5 molten steel; 6 ingot moulds; 7 insulated feeders.
Fig. 5 does not add the intermediate cross-section overall sulfur impression of the same model steel ingot of rod iron;
Fig. 6 adds the steel ingot intermediate cross-section overall sulfur impression of rod iron 2.0%;
Fig. 7 adds the steel ingot intermediate cross-section overall sulfur impression of rod iron 3.0%.
The specific embodiment
The inner-cooling method of the utility model inhibition gross segregation in large-sized steel ingot is as follows:
1, gross segregation is prevalent in the steel ingot of various materials and tonnage, as shown in Figure 1, gross segregation comprises steel ingot top normal segregation band (rising head segregated zone 8), bottom negative segregation band 13, middle part normal segregation band (" V " type segregated zone 10) and normal segregation band (" A " type segregated zone 9) on every side, form thin equiax crystal 12 on the steel ingot top layer, form column crystal 11 at the steel ingot nexine.The formation reason of gross segregation mainly is the ingot solidification overlong time, and its segregation degree of steel ingot that tonnage is big more is big more, and this gross segregation can not be eliminated by Technology for Heating Processing.By to an amount of low temperature rod iron of the inner adding of steel ingot, can accelerate the setting rate of the inner molten steel of steel ingot effectively, suppress heat-solute free convection that steel ingot inside directly causes gross segregation to form, thereby reach the purpose of control ingotism.The addition of rod iron on the one hand can not be too big, otherwise can cause that rod iron can not melt fully, in the inner casting flaw that forms other of steel ingot, as pore, is mingled with, loosens etc.; Addition can not be too little on the other hand, otherwise solidifying of steel ingot cut little ice.The optimum addition that the utility model obtains on the basis of a large amount of computer simulations (software that uses is Procast) and experiment is: 0.3%～8.0% (preferable weight range is 0.8%～3.0%) of steel ingot blank (not comprising running gate system) weight.Rod iron inside does not allow to exist casting flaw, as pore, and field trash etc., otherwise bring external defective can for the steel ingot body.Rod iron 1 is welded into ring-type, be preset in the steel ingot, shape as shown in Figure 2, cross bar 15 1 sides of cross shaped head connect vertical rod 14, the center of cross bar 15 opposite sides with vertically be connected rod iron 1 all around, rod iron 1 hangs in the steel ingot die cavity 4 by vertical rod 14.
2, rod iron must first preheating, otherwise the bubble that rises when molten steel solidification and be mingled with to assemble on cold rod iron and grow up, and causes that steel ingot is inner to be produced pore and be mingled with.Steel rod iron dispersed placement after the preheating is in steel ingot die cavity circumference 1/4～1/2 radial position, and the rod iron summit is from the distance of rising head root 20～450mm.Rod iron can not be too near to the steel ingot edge, otherwise causes rod iron not melt fully easily; Can not be too near to the centre, otherwise not have cooling effect in early days solidifying, the segregation passage forms and segregation suppresses DeGrain.
Be illustrated in figure 4 as the utility model process program sketch, form steel ingot die cavity 4 in the ingot mould 6, molten steel 5 is cast in the steel ingot die cavity 4, rod iron 1 stretches into from steel ingot die cavity 4 tops, place steel ingot die cavity 4, rod iron 1 is arranged a circle or an a few circle in steel ingot die cavity 4, and steel ingot die cavity 4 tops are provided with insulating riser sleeve 3, the insulating riser sleeve 3 inboard insulated feeders 7 that form, thermal-insulating covering agent 2 is placed at insulated feeder 7 tops.
Below in conjunction with drawings and Examples in detail the utility model is described in detail.
As shown in Figure 4, the steel ingot rising head adopts insulated feeder; Molten steel high temperature is come out of the stove, and tapping temperature is 1630 ℃, 3 tons of casting of molten metal weight, 120 seconds durations of pouring, turn over the bag cast, 1600 ℃ of pouring temperatures, cast is applying argon gas in die cavity before, pours into a mould under argon shield, by weight percentage, No. 45 composition of steel of present embodiment are: C 0.46%, Si 0.26%, and Mn 0.70%, P≤0.015%, S≤0.02%, the Fe surplus; Cast is preceding at rising head root 50mm, the position of 1/2 radius hangs up properly welds and the good rod iron of preheating, 200 ℃ of rod iron preheat temperatures, composition is: C 0.35%, P≤0.01%, S≤0.01%, diameter is 20mm, and length is 1/2 of ingot height degree, and quality accounts for 0.9% of steel ingot gross weight, after cast finishes, fill 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.As shown in Figure 3, the various segregation degree of the inner carbon of No. 45 straight carbon steel steel ingots of as cast condition obviously reduce.Wherein, " V " type carbon segregation of steel ingot middle part can not be recognized; " A " type carbon segregation of steel ingot boundary can be recognized, but degree obviously alleviates; The carbon normal segregation at steel ingot top still exists, but compares with the bottom, and both are more or less the same at carbon content.
Difference from Example 1 is:
3 tons of casting of molten metal weight, 90 seconds durations of pouring, 1580 ℃ of pouring temperatures, at rising head root 100mm, the position of 1/3 radius hangs up properly the rod iron that has welded, 300 ℃ of rod iron preheat temperatures before the cast, diameter is 30mm, length is 1/3 of ingot height degree, and quality accounts for 2.0% of steel ingot gross weight, and cast finishes rising head place, back and adds thermal-insulating covering agent; 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, as shown in Figure 6, " V " type carbon segregation of steel ingot middle part can not be recognized; " A " type carbon segregation of steel ingot boundary can recognize, but obviously alleviates with the segregation situation contrast degree of the steel ingot that does not add rod iron.
Difference from Example 1 is:
5 tons of casting of molten metal weight, 180 seconds durations of pouring, 1560 ℃ of pouring temperatures, at rising head root 200mm, the position of 1/4 radius hangs up properly the rod iron that has welded, 400 ℃ of rod iron preheat temperatures before the cast, diameter is 40mm, length is 1/4 of ingot height degree, and quality accounts for 3.0% of steel ingot gross weight, and cast finishes rising head place, back and adds thermal-insulating covering agent; Ingot steel casting finishes back 14 hours shake outs.Keep its as-cast condition to carry out sufur printing and low power metallographic test behind the shake out, as shown in Figure 7, obviously alleviate with the segregation situation contrast degree of the steel ingot that does not add rod iron.
The utility model course of work and result:
In casting process, carry out argon shield because the utility model adopts, guaranteed the pure of molten metal; Utilization adds the similar component rod iron steel ingot interior metal liquid is effectively cooled off, and greatly reduces the segregation degree of steel ingot, has produced the uniform high-performance large-scale steel ingot of each position composition.
Comparative example
3 tons of casting of molten metal weight are turned over the bag cast 100 seconds durations of pouring, and 1590 ℃ of pouring temperatures are not added rod iron before the cast, and steel ingot cools off naturally.As shown in Figure 5, 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.
Embodiment and comparative example show, utilize the utility model to carry out the manufacturing of low-segregation large-sized steel ingot, adopt suitable rod iron addition, preheat temperature, and the rod iron diameter effectively cools off steel ingot inside, suppresses the generation of macrotype ingot aliquation to a great extent.The rod iron addition is 0.3%～8.0% of a steel ingot blank weight, and vertically the rod iron summit of placing all can reach the utility model purpose from the distance of rising head root 20～450mm.
Claims (6)
1, a kind of interior device for cooling that suppresses gross segregation in large-sized steel ingot is characterized in that, this device is provided with rod iron (1), ingot mould (6), forms steel ingot die cavity (4) in the ingot mould (6), and rod iron (1) places steel ingot die cavity (4).
According to the interior device for cooling of the described inhibition gross segregation in large-sized steel ingot of claim 1, it is characterized in that 2, rod iron (1) is arranged at least one circle in steel ingot die cavity (4), the rod iron dispersed placement is in steel ingot die cavity circumference 1/4～1/2 radial position.
3, according to the interior device for cooling of the described inhibition gross segregation in large-sized steel ingot of claim 1, it is characterized in that, rod iron (1) circlewise, cross bar (15) one sides of cross shaped head connect vertical rod (14), the center of cross bar (15) opposite side with vertically be connected rod iron (1) all around, rod iron (1) hangs in the steel ingot die cavity (4) by vertical rod (14).
4, according to the interior device for cooling of the described inhibition gross segregation in large-sized steel ingot of claim 1, it is characterized in that, steel ingot die cavity (4) top is provided with insulating riser sleeve (3), the inboard insulated feeder (7) that forms of insulating riser sleeve (3), and thermal-insulating covering agent (2) is placed at insulated feeder (7) top.
According to the interior device for cooling of the described inhibition gross segregation in large-sized steel ingot of claim 1, it is characterized in that 5, rod iron rod iron summit is from the distance of rising head root 20～450mm.
6, according to the interior device for cooling of the described inhibition gross segregation in large-sized steel ingot of claim 1, it is characterized in that: every rod iron diameter is 10～60mm, and length is 1/4～1/2 of ingot height degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202195818U CN201342480Y (en) | 2008-11-19 | 2008-11-19 | Inner cooling device for prohibiting macrosegregation of large-sized steel ingot |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202195818U CN201342480Y (en) | 2008-11-19 | 2008-11-19 | Inner cooling device for prohibiting macrosegregation of large-sized steel ingot |
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| CN201342480Y true CN201342480Y (en) | 2009-11-11 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528639A (en) * | 2013-10-18 | 2014-01-22 | 重庆科技学院 | Lead water liquid level probe |
| CN104475693A (en) * | 2014-12-08 | 2015-04-01 | 辽宁科技大学 | Reduction casting compositing method and device for large iron ingots |
| CN104889349A (en) * | 2014-03-05 | 2015-09-09 | 宝钢特钢有限公司 | Production method of low macrosegregation steel ingot for large roller blank |
| CN104985144A (en) * | 2015-07-08 | 2015-10-21 | 中国科学院金属研究所 | Novel rolling ingot mold and design method thereof |
| 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 |
| CN110306007A (en) * | 2019-08-20 | 2019-10-08 | 上海大学 | A kind of material and its application method improving gross segregation in large-sized steel ingot and casting flaw |
-
2008
- 2008-11-19 CN CNU2008202195818U patent/CN201342480Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103528639A (en) * | 2013-10-18 | 2014-01-22 | 重庆科技学院 | Lead water liquid level probe |
| CN104889349A (en) * | 2014-03-05 | 2015-09-09 | 宝钢特钢有限公司 | Production method of low macrosegregation steel ingot for large roller blank |
| CN104475693A (en) * | 2014-12-08 | 2015-04-01 | 辽宁科技大学 | Reduction casting compositing method and device for large iron ingots |
| CN104985144A (en) * | 2015-07-08 | 2015-10-21 | 中国科学院金属研究所 | Novel rolling ingot mold and design method thereof |
| CN104985144B (en) * | 2015-07-08 | 2017-03-01 | 中国科学院金属研究所 | A kind of new rolling ingot mould and its method for designing |
| 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 |
| CN110306007A (en) * | 2019-08-20 | 2019-10-08 | 上海大学 | A kind of material and its application method improving gross segregation in large-sized steel ingot and casting flaw |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20121119 |