CN104439125B - The special anticrater agent of stainless steel ingot rising head - Google Patents
The special anticrater agent of stainless steel ingot rising head Download PDFInfo
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- CN104439125B CN104439125B CN201410801433.7A CN201410801433A CN104439125B CN 104439125 B CN104439125 B CN 104439125B CN 201410801433 A CN201410801433 A CN 201410801433A CN 104439125 B CN104439125 B CN 104439125B
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- steel ingot
- weight percentage
- stainless steel
- rising head
- anticrater agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
- B22D7/10—Hot tops therefor
- B22D7/102—Hot tops therefor from refractorial material only
Abstract
The invention provides a kind of special anticrater agent of stainless steel ingot rising head, belong to metallurgic auxiliary materials technical field.The special anticrater agent of stainless steel ingot rising head, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain.It is high that the stainless steel ingot rising head anticrater agent of the present invention has calorific capacity, duration is long, ignition temperature is high, and the excellent feature of heat-insulating property can effectively improve the molten metal temperature in stainless steel ingot rising head, strengthen the feeding capacity of Steel ingot feeder head, prevent from emitting that port part is loose, the generation of shrinkage cavity, effectively reduce defect that is too fast due to rising head cooling and that cause, substantially increase the quality of strand, improve strand yield rate, the use being fully able to reach steel mill requires simultaneously.
Description
Technical field
The invention belongs to metallurgic auxiliary materials technical field, be specifically related to the special anticrater agent of stainless steel ingot rising head.
Background technology
Molten steel can occur volume contraction in cooling and crystallization process, and due to the change of radiating condition, the cooling rate of solidification layer also changes therewith, and therefore the speed of linear shrinkage is quite different at the different times of solidification.In starting 5 ~ 7 minutes of solidification, average line contraction speed is maximum, and strongly reduces after 10 ~ 15 minutes.Additionally, maximum collapse coefficient and maximal velocity of contraction all reduce with the increase of phosphorus content.The quality of steel ingot and physics, chemical uniformity with the volume contraction of generation, are had a major impact by molten steel institute in cooling and crystallization process.
Owing to the condensation of molten steel is shunk, will cause shrinkage cavity and the rarefaction defect of steel ingot or cast-internal under conditions of casting compencation is insufficient, its volume is maximum up to watering the 5% of steel volume.Shrinkage cavity results from the place of steel ingot final set.Investigate and on-the-spot tracking understanding according to on-the-spot, and the understanding to type of stainless steel, and the ingot mould type to watered steel grade, Riser Dimensions size, the a series of detailed understandings such as height, characteristic according to different steel grades and the temperature watering steel, particularly very low to stainless steel carbon content, pouring temperature is high, the duration of pouring feature different in size, Steel ingot feeder head position is typically the last position that molten steel liquid phase transfers solid phase to, it is also the outlet that in casting process, gas discharges from shell, inclusion floating goes out the main exit of steel ingot, the source being also simultaneously molten steel needed for ingot head feeding is local.For avoiding Steel ingot feeder head that shrinkage cavity or feeding problem occur, anticrater agent is used to be a kind of effective measures solving problems.Anticrater agent be not only be related to stainless steel ingot emit port part cast after be full of die cavity liquid metals shrink when provide feeding molten metal, also need to ensure final set at Steel ingot feeder head, i.e. below after steel ingot die cavity molten steel solidification, molten steel final set at rising head, occurs without shrinkage cavity and rarefaction defect at such guarantee Steel ingot feeder head.
Therefore, the appropriate design of Steel ingot feeder head and the scientific matching of anticrater agent composition are the keys solving to occur Shrinkage Problem below Steel ingot feeder head with use, are also the effective way improving molten steel Utilization rate.Shrinkage cavity and molten steel Utilization rate on the low side be that at present essence casting industry generally exists and urgent problem.
Content of the invention
The technical problem to be solved is, for the deficiencies in the prior art, there is provided a kind of calorific capacity high, duration is long, good heat insulating, strengthening the feeding capacity of stainless steel ingot rising head, prevent stainless steel ingot from emitting port part is loose, produce shrinkage cavity special anticrater agent, what it was mainly used in stainless steel ingot emits port part.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: the special anticrater agent of stainless steel ingot rising head, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 10 ~ 16%, Al2O3Weight percentage is 65 ~ 75%, Fe2O3Weight percentage is 10 ~ 14%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Details are as follows for beneficial effects of the present invention:
The composition of anticrater agent needs to consider following factor, and first, the composition that produces after anticrater agent burning must be the element being easy in the composition that allows of steel grade used or smelting process remove, the normal use of such guarantee foundry returns；Secondly, electrothermal calefactive rate, heating temp and the fever time of anticrater agent should be ensured, control the cost of anticrater agent again.Additionally, be commonly designed steel ingot and the anticrater agent of casting pressing port is to separately design various anticrater agent according to the difference of steel grade phosphorus content.According to the difference of steel grade, can be designed that high-carbon anticrater agent and low-carbon (LC) anticrater agent.High-carbon anticrater agent is mainly determined by the quality of carbon, and when component design, the raw material of optional carbon containing adjust anticrater agent, and carbon is good insulation material, is the important materials of buffer.Compare; type of stainless steel is very sensitive to carbon content; the problem that can not consider phosphorus content when dispensing; use carbon-free raw material as far as possible; anticrater agent raw material must strictly control phosphorus content; so just may insure that the composition of foundry returns and re-use, because the carbon of foundry returns can not be removed during electric furnace smelting.
The present invention puts forward on the basis of considering factors above and fully research anticrater agent heating principle, and anticrater agent is made up of oxidant, incendiary agent and buffer three part.At a certain temperature, oxidant and incendiary agent generation oxidation reaction, release substantial amounts of heat.Buffer can be used to adjust temperature, electrothermal calefactive rate and the fever time that adstante febre produces, and react with the combustion product of oxidant and incendiary agent, generates low melting point slag, and after steel ingot, casting solidification, slag must also be easy to dispose from pouring into a mould rising head head.
What the anticrater agent of the present invention was mainly used in stainless steel ingot emits port part, prevents emitting port part and loose, Shrinkage Problem occurs, must strictly control phosphorus content in use.
Rational proportion based on the heating principle of stainless steel anticrater agent and material therefor, the special anticrater agent of stainless steel produced, in using at the scene, Steel ingot feeder head position serves the due effect of anticrater agent, and anticrater agent calorific capacity is high, and the duration is long, ignition temperature is high, good heat insulating, makes ingot head shrink smooth, shrinkage cavity phenomenon does not occur, and rear portion hot rolling not finding, Steel ingot feeder head part interior loosens yet, the generation of shrinkage cavity.
Stainless steel ingot rising head anticrater agent of the present invention is the special anticrater agent for metallurgical casting process, there is calorific capacity high, duration is long, ignition temperature is high, the excellent feature of heat-insulating property, the molten metal temperature in Steel ingot feeder head can be effectively improved, strengthen the feeding capacity of Steel ingot feeder head, prevent from emitting that port part is loose, the generation of shrinkage cavity, effectively reduce defect that is too fast due to rising head cooling and that cause, substantially increasing the quality of strand, improve strand yield rate simultaneously, the use being fully able to reach steel mill requires.
Detailed description of the invention
In order to be further elucidated with in more detail rather than limit the present invention, provide the following example.
Embodiment one
The special anticrater agent of stainless steel ingot rising head of the present invention, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 10%, Al2O3Weight percentage is 68%, Fe2O3Weight percentage is 12%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Embodiment two
The special anticrater agent of stainless steel ingot rising head of the present invention, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 12%, Al2O3Weight percentage is 70%, Fe2O3Weight percentage is 14%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Embodiment three
The special anticrater agent of stainless steel ingot rising head of the present invention, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 16%, Al2O3Weight percentage is 75%, Fe2O3Weight percentage is 10%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Embodiment four
The special anticrater agent of stainless steel ingot rising head of the present invention, its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 14%, Al2O3Weight percentage is 65%, Fe2O3Weight percentage is 11%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Claims (1)
1. the special anticrater agent of stainless steel ingot rising head, it is characterized in that: its raw material includes metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock ink, sodium fluoride, magnesia grain, its weight percentage is respectively the 28%th, the 10%th, the 25%th, the 10%th, the 6%th, the 8%th, 13%；In the described special anticrater agent of stainless steel ingot rising head, SiO2Weight percentage is 10 ~ 16%, Al2O3Weight percentage is 65 ~ 75%, Fe2O3Weight percentage is 10 ~ 14%, and CaO weight percentage is less than 5%, and MgO weight percentage is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is more than 1350 DEG C, and moisture weight percentage composition is less than 1%.
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| CN107335782A (en) * | 2017-08-19 | 2017-11-10 | 江苏标新工业有限公司 | A kind of covering flux of ingot casting high-efficiency cleaning and preparation method thereof |
| CN110306093A (en) * | 2019-08-16 | 2019-10-08 | 郑州东升冶金新材料有限公司 | A kind of high-performance heat retaining and exothermal material and preparation method thereof |
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| SU923722A1 (en) * | 1980-06-23 | 1982-04-30 | Uk Nii Sp Stalej | Exothermic mixture |
| CN101642799B (en) * | 2009-08-19 | 2012-12-05 | 西峡县鑫龙保温材料有限公司 | Molded cap ball composite heating agent and production process thereof |
| CN102554128A (en) * | 2010-12-28 | 2012-07-11 | 苏州明志科技有限公司 | Heat-insulating riser |
| CN102091758B (en) * | 2011-02-24 | 2012-12-05 | 河南省鑫龙冶材集团有限公司 | Novel die cast cap port sphere composite heating agent and production method thereof |
| CN102825218A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite exothermic agent for high-manganese wear resistant steel |
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Effective date of registration: 20170116 Address after: Nanyang City, Henan province 474500 Xixia county level Industrial Park (Guanhe Road extension) Patentee after: Henan Xibao Metallurgy Materials Group Co., Ltd. Patentee after: Xixia County Xibao metallurgy material limited company Address before: 474500 Xixia, Henan Province River Road, No. 412, No. Patentee before: Henan Xibao Metallurgy Materials Group Co., Ltd. |