CN201223932Y - Apparatus for inhibiting aliquation of large-sized steel ingot - Google Patents

Apparatus for inhibiting aliquation of large-sized steel ingot Download PDF

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Publication number
CN201223932Y
CN201223932Y CNU2008200127017U CN200820012701U CN201223932Y CN 201223932 Y CN201223932 Y CN 201223932Y CN U2008200127017 U CNU2008200127017 U CN U2008200127017U CN 200820012701 U CN200820012701 U CN 200820012701U CN 201223932 Y CN201223932 Y CN 201223932Y
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CN
China
Prior art keywords
ingot
steel ingot
steel
aliquation
segregation
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Expired - Lifetime
Application number
CNU2008200127017U
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Chinese (zh)
Inventor
桑宝光
李殿中
夏立军
康秀红
李依依
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Jiangsu Sunan Heavy Industry Machinery Technology Co., Ltd.
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Institute of Metal Research of CAS
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Priority to CNU2008200127017U priority Critical patent/CN201223932Y/en
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Abstract

The utility model discloses a large-steel ingot segregation suppression device, relating to the casting process of all under-600t-level metal mold large-scale steel ingots; the device is applied to the carbon steel and alloy steel ingot casting process in vacuum and non-vacuum conditions, and can restrain all component segregations of various black alloy steel ingots. A steel ingot mold is arranged on a chassis; a ventilation pipeline is pre-cast in the chassis; permeable bricks are arranged around the bottom part of the steel ingot mold; and the ventilation pipeline is communicated with the permeable bricks at the bottom part of the steel ingot mold. In the utility model, a large steel ingot sidewall compressed air cooling system is designed to greatly improve the cooling speed of large steel ingots, accelerate the steel ingot solidification rate, shorten the demoulding time and effectively improve the production efficiency of large steel ingots; therefore, the large-steel ingot segregation suppression device can well restrain the large-steel ingot segregation and solves the problem of low productivity of the existing large-scale steel ingot segregation in the factories.

Description

A kind of device that suppresses macrotype ingot aliquation
Technical field
The utility model is a kind of device that suppresses macrotype ingot aliquation, the casting process that relates to following all the rank metal pattern large-scale steel ingots of 600t, be applied to the casting process of carbon steel and alloy steel ingot under vacuum and the non-vacuum condition, the various component segregations of various black alloy material steel ingots are all had inhibitory action.
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 process of setting of large-scale steel ingot is very very long, according to steel ingot tonnage difference, do not wait in tens hours to up to a hundred hours, the solute reallocation fully, cause low melting point, low-density elements such as carbon, phosphorus in the solidification front enrichment, add other physical process, as the influence of thermosolutal convection etc., make steel ingot zones of different uneven chemical components, cause gross segregation and microsegregation.Factory is used for the melt pit and the vacuum chamber resource-constrained of vacuum pouring large-scale steel ingot, and the low problem of its productivity ratio highlights day by day.Accelerating the steel ingot cooling, suppress ingotism, is to enhance productivity, and improves the unique channel of ingot quality.
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 determining etc. of segregation type, segregation position, making slow progress aspect the segregation control measure, almost there are not effective measures can suppress gross segregation.In decades in the production of large-scale steel ingot, factory takes the method that allows it cool off naturally, only solidify fully and rising head adopts the method for removing insulated feeder earlier to boost productivity when not solidifying fully at the ingot body, this method, can only shift to an earlier date several hrs, to compare effect in dozens or even hundreds of hour limited with the large-scale steel ingot setting time.
The utility model content
The purpose of this utility model is to provide a kind of device that suppresses macrotype ingot aliquation, the present macrotype ingot aliquation of solution factory, the problem that production efficiency is low.
The technical solution of the utility model is:
A kind of device that suppresses macrotype ingot aliquation, ingot mould is arranged on the chassis, and precasting breather line in the chassis is laid air brick around the ingot mould bottom, and breather line communicates with the air brick of ingot mould bottom.
The device of described inhibition macrotype ingot aliquation is laid air brick all around at the ingot mould top.
The device of described inhibition macrotype ingot aliquation, the ingot mould top is provided with insulated feeder, insulated feeder arranged outside insulation heat-insulating shield, insulation heat-insulating shield arranged outside riser buss.
The device of described inhibition macrotype ingot aliquation, the insulated feeder top is placed with exothermic mixture and thermal-insulating covering agent.
Adopt the utility model to suppress the method for macrotype ingot aliquation, comprise the steps:
1) the ingot mould material is a grey cast-iron;
2) rising head adopts insulated feeder, and the rising head tapering is 8~16%;
3) ratio of height to diameter of steel ingot (ratio of steel ingot height and average diameter) is 1:1~2:1;
4) the steel ingot material is carbon steel or steel alloy;
5) precasting breather line in the ingot mould chassis is laid air brick around the ingot mould bottom;
6) ingot steel casting finishes the back and began logical compressed air in 1~8 hour, and the ingot body stops ventilation when solidifying fully.
In the chemical composition of the utility model material therefor, by weight percentage, C:0.01~0.75%, P≤0.02%, S≤0.02%.
The utility model rising head adopts insulated feeder, the rising head tapering is 8~16%, insulated feeder is up-small and down-big, and material is a high-quality refractory material: high-alumina brick, corundum, mullite, magnesia brick, magnalium goods or aluminum silicate insulation material etc., there is one deck asbestos insulation board the refractory material outside.
The utility model is applicable to the steel ingot of all ratio of height to diameters, can obtain tangible benefit and use on large-scale steel ingot, and its ratio of height to diameter is generally 1:1~2:1.
The utility model adopts rising head to add exothermic mixture and thermal-insulating covering agent; The ingot mould preheat temperature is 50~200 ℃.
The utility model is arranged pipeline in the chassis, pipe diameter is determined according to the steel ingot tonnage is different, inside diameter ranges 30~200mm, at the ingot mould bottom periphery air brick that evenly distributes, make molten steel when cast porous not, and reaching 150~250mm in the steel ingot side wall solidification layer, air gap begins logical compressed air when reaching 5~30mm width, to accelerate the steel ingot cooling.
The utility model is determined the time that begins to ventilate, the flow of gas and the time that ventilation stops according to air gap situation of change between ingot solidification layer thickness and steel ingot and the ingot mould etc., it is wide to reach 5~30mm at air gap, simultaneously solidified layer thickness reaches 150mm and begins logical compressed air when above, and the bigger stress of generation causes steel ingot to crack even ruptures in case ingot solidification speed is too fast.
In the utility model, throughput was little when compressed air began, enlargement discharge gradually then, and compressed-air actuated flow changes in 3~10kg/s scope, and compressed-air actuated pressure is 5~10 atmospheric pressure.
In the utility model, large-scale steel ingot is meant 100~600 tons steel ingot.
In the utility model, the software that computer simulation is used is ProCast.
The utlity model has following beneficial effect:
1. the utility model technological design is reasonable, by changing large-scale steel ingot external heat-exchanging condition, adopted in the logical compressed-air actuated method of large-scale steel ingot sidewall, improved the cooling velocity of large-scale steel ingot greatly, can significantly shorten the setting time of steel ingot, shorten demould time, improve the production efficiency of steel ingot, thereby improve the output of heavy casting and forging.
2. the utility model aerating system reasonable in design, compressed air can cool off by the ingot mould sidewall, and system is simple, and is safe, workable, and enterprise realizes easily.
3. employing the utility model, the setting time of steel ingot shortens dramatically, and various types of gross segregations have the obvious suppression effect to large-scale steel ingot, especially " A " type segregation that has a strong impact on follow-up forging quality are had good inhibitory effect.
4. the utility model is applicable to the manufacturing of the large-scale steel ingot of various materials.Utilize the utility model to produce large-scale steel ingot and have low segregation, dense structure, low cost, short characteristics of cycle, be easy to obtain vast research institution and works approval, in case be widely adopted, then can accelerate large-scale steel ingot production efficiency greatly, improve ingot quality, that will have tens benefits to hundreds of individual hundred million.
Description of drawings
Fig. 1 large ingot mould assembling schematic diagram, among the figure:
1 ingot mould; 2 steel ingots; 3 insulated feeders; 4 insulation heat-insulating shields; 5 riser busses; 6 exothermic mixtures; 7 thermal-insulating covering agents; 8 air bricks; 9 breather lines; 10 chassis.
The specific embodiment
The utility model is a kind of, and to suppress the device of macrotype ingot aliquation as follows:
1, the utility model adopts high-quality insulated feeder to make steel ingot top molten steel keep high temperature, helps keeping the steel ingot head temperature, makes riser metal liquid carry out feeding to the steel ingot body, avoids the loose generation of shrinkage cavity.The insulated feeder height obtains vacuum pouring after being calculated by computer simulation software.
Fig. 1 is large ingot mould assembling schematic diagram, ingot mould 1 is arranged on the chassis 10, ingot mould 1 top is provided with insulated feeder 3, insulated feeder 3 arranged outside insulation heat-insulating shield 4, insulation heat-insulating shield 4 arranged outside riser busses 5, cavity in the ingot mould 1 forms steel ingot 2, insulated feeder 3 tops are placed with exothermic mixture 6, thermal-insulating covering agent 7, precasting breather line 9 in chassis 10, lay air brick 8 around in ingot mould 1 bottom, lay air brick 8 around at ingot mould 1 top, breather line 9 communicates with the air brick 8 of ingot mould 1 bottom.
2, large-scale steel ingot is because the duration of pouring is long, and thermal capacitance is very big, and computer simulation all is instantaneous being full of of hypothesis usually.Because one of key parameter that the utility model relates to is exactly the logical compressed-air actuated time, and the outer field solidified layer thickness of steel ingot changes the best duration of ventilation of decision.Suppose instantaneously to be full of that to carry out temperature field result calculated setting time long partially, higher safety coefficient is arranged thus the logical compressed-air actuated opportunity of Que Dinging.
3, next adopt the instantaneous hypothesis that is full of of die cavity to carry out temperature field simulation, to determine best duration of ventilation.Time when getting the several characteristic point reaching certain thickness to determine the ingot solidification layer on the steel ingot longitudinal section, the result is as shown in table 1.When ventilation, because cooling velocity can obviously increase, the stress of generation can significantly strengthen, thereby needs the enough solidified layer thickness of steel ingot generation can begin ventilation.
The setting time of table 1 solidified layer thickness correspondence (hour)
From chassis height (mm) 520 1000 1550 4551
Solidified layer thickness is the setting time of 150mm 1.8 2.2 2.3 2.5
Solidified layer thickness is the setting time of 250mm 2.5 3.5 3.5 4
By analog computation as can be seen, after 3 hours, solidified layer thickness can both reach 150mm on whole steel ingot height, consider the instantaneous hypothesis that is full of when solidification simulation, because reach more than 1 hour the duration of pouring, reached 100mm by the solidified layer thickness that calculates simulation steel ingot bottom, and steel ingot top solidification layer is thinner, so can begin ventilation in 3~4 hours filling the type back that finishes.
4, the utility model is based on steel ingot solidification shrinkage takes place when solidifying, and produces this physical phenomenon of air gap between steel ingot and ingot mould, the time that air gap produces, much can drawing by adopting simulation softward carry out stress simulation is arranged finally.After solidifying 3 hours, steel ingot top width of air gap has reached 22mm, and the bottom width of air gap also reaches 8mm, so 3~4 hours logical compressed air is feasible behind the casting complete.
Below in conjunction with drawings and Examples in detail the utility model is described in detail.
Embodiment 1
As shown in Figure 1, the ingot mould material is grey cast-iron HT150, and the ingot mould preheat temperature is 100 ℃, and rising head adopts insulated feeder, and the rising head tapering is 11.5%, and the steel ingot ratio of height to diameter is 1.15: 1; 600 tons of casting of molten metal weight, the duration of pouring 80min, vacuum pouring, pouring temperature is 1590 ℃, by weight percentage, and 508-3 low-alloy steel chemical composition: C:0.18%, Si:0.20%, Mn:1.45%, Mo:0.5%, Ni:0.75%, Cr:0.15, P≤0.005%, S≤0.002%, Fe surplus.After cast finishes, fill exothermic mixture and thermal-insulating covering agent in the rising head top; Ingot steel casting finishes to begin in back 3 hours logical compressed air, notes the setting time of steel ingot.
Adopt following technology: (1) adopts the cast of teeming formula, vacuumizes before the cast, reduces secondary oxidation.(2) use insulated feeder and exothermic mixture and thermal-insulating covering agent simultaneously, reduce steel ingot shrinkage cavity, rarefaction defect as far as possible.(3) ingot steel casting finishes to begin in back 3 hours logical compressed air, and throughput is little during beginning, and enlargement discharge gradually then can reduce the temperature of ingot mould when taking away the surface of steel ingot heat, significantly improve ingot solidification speed.
In the present embodiment, compressed-air actuated flow changes in 6~10kg/s scope, and compressed-air actuated pressure is 8 atmospheric pressure.
Embodiment 2
Difference from Example 1 is: the ingot mould material is grey cast-iron HT250, and the ingot mould preheat temperature is 150 ℃, and rising head adopts insulated feeder, and the rising head tapering is 10%, and the steel ingot ratio of height to diameter is 1:1; 500 tons of casting of molten metal weight, the duration of pouring 60min.
In the present embodiment, compressed-air actuated flow changes in 5~8kg/s scope, and compressed-air actuated pressure is 6 atmospheric pressure.
The utility model course of work and result:
Because the utility model has been developed the logical compressed-air actuated device of steel ingot side wall, not only can in time the heat of steel ingot outer surface be taken away, temperature with the ingot mould inboard reduces simultaneously, also increased the radiant heat transfer of steel ingot to ingot mould, accelerated the cooling velocity of steel ingot greatly, can significantly improve the production efficiency of large-scale steel ingot, significantly improve the segregation problem of large-scale steel ingot.
The result of embodiment shows, the utility model is a foundation with the large-scale steel ingot Computer simulation results, designed large-scale steel ingot sidewall ventilation cooling device can significantly improve the setting rate of large-scale steel ingot, shorten demould time, significantly improve the production efficiency of steel ingot, and, especially " A " type segregation that has a strong impact on follow-up forging quality is had good inhibitory effect to suppressing macrotype ingot aliquation, be applicable to the manufacturing of the large-scale steel ingot of various materials such as carbon steel or steel alloy.

Claims (4)

1, a kind of device that suppresses macrotype ingot aliquation, it is characterized in that: ingot mould (1) is arranged on the chassis (10), precasting breather line (9) in chassis (10), lay air brick (8) around ingot mould (1) bottom, breather line (9) communicates with the air brick (8) of ingot mould (1) bottom.
2, according to the device of the described inhibition macrotype ingot aliquation of claim 1, it is characterized in that: lay air brick (8) around at ingot mould (1) top.
3, according to the device of the described inhibition macrotype ingot aliquation of claim 1, it is characterized in that: ingot mould (1) top is provided with insulated feeder (3), insulated feeder (3) arranged outside insulation heat-insulating shield (4), insulation heat-insulating shield (4) arranged outside riser buss (5).
4, according to the device of the described inhibition macrotype ingot aliquation of claim 3, it is characterized in that: insulated feeder (3) top is placed with exothermic mixture (6) and thermal-insulating covering agent (7).
CNU2008200127017U 2008-05-15 2008-05-15 Apparatus for inhibiting aliquation of large-sized steel ingot Expired - Lifetime CN201223932Y (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012040987A1 (en) * 2010-09-30 2012-04-05 西峡龙成特种材料有限公司 Non-electroslag re-melting type clean metal ingot mold
CN103350216A (en) * 2013-07-03 2013-10-16 上海交通大学 Cast ingot homogenizing control method
CN104308097A (en) * 2014-10-17 2015-01-28 江苏联峰能源装备有限公司 Novel ingot mold for enhancing quality and increasing utilization ratio of steel ingot
CN104439124A (en) * 2014-11-27 2015-03-25 清华大学 Method for restraining macrosegregation of large steel ingot
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
CN107790651A (en) * 2016-09-06 2018-03-13 鞍钢股份有限公司 A kind of method for improving steel ingot cooling condition
CN109202020A (en) * 2018-10-31 2019-01-15 东台市颖达金属制品制造有限公司 A kind of insulated feeder of multistage fever

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012040987A1 (en) * 2010-09-30 2012-04-05 西峡龙成特种材料有限公司 Non-electroslag re-melting type clean metal ingot mold
US9010403B2 (en) 2010-09-30 2015-04-21 Nanyang Xingzhi Patent Technology Service Co., Ltd. Non-electroslag remelting type clean metal ingot mold
CN103350216A (en) * 2013-07-03 2013-10-16 上海交通大学 Cast ingot homogenizing control method
CN103350216B (en) * 2013-07-03 2015-07-08 上海交通大学 Cast ingot homogenizing control method
CN104308097A (en) * 2014-10-17 2015-01-28 江苏联峰能源装备有限公司 Novel ingot mold for enhancing quality and increasing utilization ratio of steel ingot
CN104439124A (en) * 2014-11-27 2015-03-25 清华大学 Method for restraining macrosegregation of large steel ingot
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
CN107790651A (en) * 2016-09-06 2018-03-13 鞍钢股份有限公司 A kind of method for improving steel ingot cooling condition
CN107790651B (en) * 2016-09-06 2019-06-28 鞍钢股份有限公司 A method of improving steel ingot cooling condition
CN109202020A (en) * 2018-10-31 2019-01-15 东台市颖达金属制品制造有限公司 A kind of insulated feeder of multistage fever
CN109202020B (en) * 2018-10-31 2020-04-24 东台市颖达金属制品制造有限公司 Multistage exothermic heat preservation rising head

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Free format text: CORRECT: ADDRESS; FROM: 110016 SHENYANG, LIAONING PROVINCE TO: 215537 SUZHOU, JIANGSU PROVINCE

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Address after: 215537 No. 6 Xing Gang Road, Jiangsu, Changshou City

Patentee after: Jiangsu Sunan Heavy Industry Machinery Technology Co., Ltd.

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Patentee before: Institute of metal research, Chinese Academy of Sciences

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Granted publication date: 20090422