CN104439125A - Special shrinkage-proof agent for stainless steel ingot feeder head - Google Patents
Special shrinkage-proof agent for stainless steel ingot feeder head Download PDFInfo
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- CN104439125A CN104439125A CN201410801433.7A CN201410801433A CN104439125A CN 104439125 A CN104439125 A CN 104439125A CN 201410801433 A CN201410801433 A CN 201410801433A CN 104439125 A CN104439125 A CN 104439125A
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- steel ingot
- stainless steel
- weight percentage
- feeder head
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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
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- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a special shrinkage-proof agent for a stainless steel ingot feeder head, and belongs to the technical field of metallurgical auxiliary materials. Raw materials of the special shrinkage-proof agent for the stainless steel ingot feeder head comprise metal aluminum powder, iron oxide powder, alumina powder, sodium nitrate, soft stone dust, sodium fluoride and magnesia particles. The special shrinkage-proof agent for the stainless steel ingot feeder head has the advantages of being high in calorific value, long in duration time, high in combustion temperature and good in thermal insulation performance, and can effectively increase the temperature of molten metal in the stainless steel ingot feeder head, improve the feeding capacity of the steel ingot feeder head, prevent the feeder head part against loosening and shrinkage, effectively reduce defects caused by excessively fast cooling of the feeder head, greatly improve the quality of casting blanks, increase the finished product ratio of the casting blanks and completely meet use requirements of a steel plant.
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
Can there is volume contraction in cooling and crystallization process in molten steel, due to the change of radiating condition, the cooling rate of solidification layer also changes thereupon, and the speed of therefore linear shrinkage is very not identical at the different times solidified.In 5 ~ 7 minutes of starting to solidify, average line contraction speed is maximum, and sharply reduces after 10 ~ 15 minutes.In addition, maximum collapse coefficient and maximal velocity of contraction all reduce with the increase of phosphorus content.The volume contraction of the adjoint generation of molten steel institute in cooling and crystallization process, has material impact to the quality of steel ingot and physics, chemical uniformity.
Because the condensation of molten steel is shunk, will cause shrinkage cavity and the rarefaction defect of steel ingot or cast-internal under the condition that casting compencation is insufficient, maximum the reaching of its volume waters 5% of steel volume.Shrinkage cavity results from the place of steel ingot final set.According to investigation and the on-the-spot tracking understanding at scene, 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, according to the characteristic of different steel grade and the temperature of watering steel, particularly very low to stainless steel carbon content, pouring temperature is high, the feature that the duration of pouring is different in size, Steel ingot feeder head position normally molten steel liquid phase transfers the last position of solid phase to, also be 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 to occur shrinkage cavity or feeding problem, anticrater agent is adopted to be a kind of effective measures solving problems.Anticrater agent is not only and is related to that the liquid metals being full of die cavity after stainless steel ingot emits port part to pour into a mould provides the molten metal of feeding when shrinking, also need to ensure Steel ingot feeder head place final set, namely below it after steel ingot die cavity molten steel solidification, the molten steel final set at rising head place, there is not shrinkage cavity and rarefaction defect in such guarantee Steel ingot feeder head place.
Therefore, the appropriate design of Steel ingot feeder head and the scientific matching of anticrater agent composition are solve the key occurring Shrinkage Problem below Steel ingot feeder head with using, and are also the effective ways improving molten steel Utilization rate.Shrinkage cavity and molten steel Utilization rate on the low side be at present essence casting industry ubiquity and urgent problem.
Summary of the invention
Technical problem to be solved by this invention is, for the deficiencies in the prior art, there is provided a kind of calorific capacity high, duration is long, good heat insulating, strengthen the feeding capacity of stainless steel ingot rising head, prevent stainless steel ingot from emitting port part to loosen, produce the special anticrater agent of shrinkage cavity, what it was mainly used in stainless steel ingot emits port part.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the special anticrater agent of stainless steel ingot rising head, its raw material comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 10 ~ 16%, Al
2o
3weight percentage is 65 ~ 75%, Fe
2o
3weight percentage is that 10 ~ 14%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Details are as follows for beneficial effect of the present invention:
The composition of anticrater agent needs to consider following factor, first, anticrater agent burning after produce composition must be steel grade used allow composition or smelting process in be easy to remove element, the normal use of such guarantee foundry returns; Secondly, the electrothermal calefactive rate of anticrater agent, heating temp and fever time should be ensured, control the cost of anticrater agent again.In addition, the anticrater agent of design steel ingot and casting pressing port designs various anticrater agent respectively according to the difference of steel grade phosphorus content usually.According to the difference of steel grade, high-carbon anticrater agent and low-carbon (LC) anticrater agent can be designed.High-carbon anticrater agent is mainly determined by the quality of carbon, and when component design, the raw material of carbon containing can be selected to adjust anticrater agent, and carbon being good insulation material, is the important materials of buffer.Compare; type of stainless steel is very sensitive to carbon content; the problem of phosphorus content can not be considered when preparing burden; use carbon-free raw material as far as possible; anticrater agent raw material strictly must control phosphorus content; so just can guarantee the composition of foundry returns and re-use, because the carbon of foundry returns can not be removed in electric furnace smelting process.
The present invention puts forward on the basis considering above factor and abundant research anticrater agent heating principle, anticrater agent by oxidant, incendiary agent and buffer three part form.At a certain temperature, oxidant and incendiary agent generation oxidation reaction, release a large amount of heat.Buffer can be used for adjusting temperature that adstante febre produces, electrothermal calefactive rate and fever time, and react with the combustion product of oxidant and incendiary agent, generate low melting point slag, after steel ingot, casting solidification, slag also must be easy to dispose from cast rising head head.
What anticrater agent of the present invention was mainly used in stainless steel ingot emits port part, prevents from emitting port part to occur loose, Shrinkage Problem, strictly must control phosphorus content in use.
Based on the heating principle of stainless steel anticrater agent and the rational proportion of material therefor, the special anticrater agent of the 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, does not occur shrinkage cavity phenomenon, and do not find in the hot rolling of rear portion that Steel ingot feeder head part interior loosens, the generation of shrinkage cavity yet.
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 feature that heat-insulating property is excellent, effectively can improve the molten metal temperature in Steel ingot feeder head, strengthen the feeding capacity of Steel ingot feeder head, prevent emitting port part to loosen, the generation of shrinkage cavity, effectively reduce due to the too fast and defect that causes of rising head cooling, substantially increase the quality of strand, improve strand yield rate simultaneously, the instructions for use of steel mill can be reached completely.
Detailed description of the invention
In order to illustrate further in more detail instead of 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 comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 10%, Al
2o
3weight percentage is 68%, Fe
2o
3weight percentage is that 12%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater 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 comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 12%, Al
2o
3weight percentage is 70%, Fe
2o
3weight percentage is that 14%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater 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 comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 16%, Al
2o
3weight percentage is 75%, Fe
2o
3weight percentage is that 10%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater 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 comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
In the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 14%, Al
2o
3weight percentage is 65%, Fe
2o
3weight percentage is that 11%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater than 1350 DEG C, and moisture weight percentage composition is less than 1%.
Claims (2)
1. the special anticrater agent of stainless steel ingot rising head, it is characterized in that: its raw material comprises metallic aluminium powder, brown iron oxide, alumina powder, sodium nitrate, soft rock foam, sodium fluoride, magnesia grain, and its weight percentage is respectively 28%, 10%, 25%, 10%, 6%, 8%, 13%.
2. the special anticrater agent of stainless steel ingot rising head as claimed in claim 1, is characterized in that: in the described special anticrater agent of stainless steel ingot rising head, SiO
2weight percentage is 10 ~ 16%, Al
2o
3weight percentage is 65 ~ 75%, Fe
2o
3weight percentage is that 10 ~ 14%, CaO weight percentage is less than 5%, MgO weight percentage and is less than 15%, and fixed carbon weight percentage is less than 3%, and fusing point is greater than 1350 DEG C, and moisture weight percentage composition is less than 1%.
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| CN201410801433.7A CN104439125B (en) | 2014-12-22 | 2014-12-22 | The special anticrater agent of stainless steel ingot rising head |
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| CN201410801433.7A CN104439125B (en) | 2014-12-22 | 2014-12-22 | The special anticrater agent of stainless steel ingot rising head |
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| CN104439125A true CN104439125A (en) | 2015-03-25 |
| CN104439125B CN104439125B (en) | 2016-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 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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|---|---|
| CN104439125B (en) | 2016-11-09 |
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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. |