CN106146044B - A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof - Google Patents
A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof Download PDFInfo
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- CN106146044B CN106146044B CN201510136780.7A CN201510136780A CN106146044B CN 106146044 B CN106146044 B CN 106146044B CN 201510136780 A CN201510136780 A CN 201510136780A CN 106146044 B CN106146044 B CN 106146044B
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Abstract
The present invention relates to a kind of resistance to molten steel to corrode molding heat-insulating shield and preparation method thereof, and it is to be coated to obtain by steel face in heat-insulating shield using corundum coating that the resistance to molten steel, which corrodes molding with heat-insulating shield, and wet coating or dry method coating can be used.Resistance to molten steel of the invention corrodes molding heat-insulating shield, is the working face in heat-insulating shield contact molten steel, by coated corundum matter coating, to improve the refractoriness of the working face of heat-insulating shield contact molten steel；After coated corundum matter coating, the phenomenon that heat-insulating shield directly contacts molten steel and the heat-insulating shield occurred and steel ingot adhesion, and the surface that corundum coating fine powder is formed are not only avoided, is not infiltrated with molten steel, is easier to improve the finish of ingot head；Meanwhile heat-insulating shield is completely cut off by corundum coating, is not easy to lose powder, scaling-off, reduces the source of foreign impurity in steel, is conducive to the raising of steel ingot internal soundness.
Description
Technical field
The present invention relates to a kind of thermal insulation materials that cast uses, and in particular to a kind of resistance to molten steel erosion molding insulation
Plate and preparation method thereof.
Background technique
Now molding is with quartz sand, mineral wool fiber, cardboard, clay, resin, flyash etc. for raw material with heat-insulating shield, respectively
It weighs according to each raw material proportioning, is then packed into agitator tank pulping further in accordance with defined sequence and Adding Way, stir 15 minutes
Afterwards, the slurry being stirred is put into storage material slot, it is to be formed.Molding is using vacuum filtration molding, the internal layer being first stirred in advance
Slurry is quantitatively adding in molding die, suction strainer after pressing, and the slurry of outer layer is then filled up chess tool again, after water exhaustion, is stopped
Suction strainer, turnover mould hold molded heat-insulating shield slab with supporting plate；Last procedure is drying, by the slab of heat-insulating shield,
Be sent into dry kiln drying, taken out after 12 hours, according to its physical and chemical index of standard test and outer dimension, it is standard compliant enter
Library, for use.The demand that this heat-insulating shield is able to satisfy most of steel grade heat preservation, reduces cutting head rate.But existing main problem is steel
After ingot demoulding, heat-insulating shield and the easy adhesion of ingot head and slag inclusion not only affect surface of steel ingot and internal soundness, even more in steel ingot
The quality rolled rod surface and influence steel can be damaged when with the rolling of cap portion.
Therefore, develop a kind of resistance to molten steel corrode, the molding heat-insulating shield of non-stick steel it is necessary.
Founding iron mold heat-insulating shield operating temperature will be at 800 DEG C or more；Existing heat-insulating shield is at 800 DEG C or more, because of component
In organic matter burning and low melting point fusing, cracking will be generated, shrink obvious, deformation, or even is picking, scaling-off；It is this
After changed heat-insulating shield and steel contacts, after waiting molten steel cooling, steel ingot table at cap mouth will be just adhered to mixing of molten steel
Face, it is extremely difficult to fall off；When mill milling is this has heat-insulating shield and steel slag to mix the steel ingot that can adhere to, this attachment, which will scratch, to be rolled
Roller, there is a great harm for equipment.Simultaneous with the roll of scuffing also defect can be caused in steel surface when rolling steel ingot；In addition,
Enter in molten steel from slag, the powder fallen down on heat-insulating shield, cannot such as float to ingot head in time, foreing impuritys in steel will be become
Object influences the inherent quality of mill product very big.
Summary of the invention
Aiming at the above shortcomings existing in the prior art, technical problem to be solved by the invention is to provide a kind of resistance to molten steel
It corrodes, the molding heat-insulating shield of non-stick steel, is the working face in heat-insulating shield contact molten steel, by coated corundum matter coating, to mention
The refractoriness of the working face of high heat-insulating shield contact molten steel；After coated corundum matter coating, not only avoids heat-insulating shield and directly contact steel
Water and the phenomenon that the heat-insulating shield that occurs and steel ingot adhesion, and the surface that corundum coating fine powder is formed does not infiltrate, more with molten steel
Easily improve the finish of ingot head；Meanwhile heat-insulating shield is completely cut off by corundum coating, is not easy to lose powder, scaling-off, reduces steel China and foreign countries
The source for carrying out field trash is conducive to the raising of steel ingot internal soundness.
For achieving the above object, present invention employs following technical solutions:
A kind of resistance to molten steel erosion molding heat-insulating shield, is coat by steel face in heat-insulating shield using corundum coating
It arrives.
Resistance to molten steel of the present invention corrodes molding heat-insulating shield can be prepared by wet coating and dry method coating.
The method that the wet coating preparation resistance to molten steel corrodes molding heat-insulating shield, it includes following steps:
(1) heat-insulating shield is prepared, is dried；
(2) after adding water to mix well corundum coating, in being coated by steel face for heat-insulating shield；
(3) heat-insulating shield after coating is dried.
Step (1) heat-insulating shield for preparing can be prepared by common process, for example, by quartz sand, high alumina ceramic fiber,
The raw materials such as old newsprint, ceramic hollow ball carry out pulping, are uniformly mixing to obtain slurry, add slurry into molding die, after pressing
Suction strainer is smoothed out in suction strainer with trowel, stops suction strainer, and turnover mould holds the slab of heat-insulating shield with supporting plate, is sent into dry kilning
Dry, drying is taken out after about 12 hours, according to its physical and chemical index of standard test and outer dimension, standard compliant storage, for use.
Preferably,
The drying temperature of step (1) is 100-150 DEG C, and drying time is 12~24 hours.
Step (2) coating preferably coats 2-3 times repeatedly, and the coated weight of each corundum coating (is converted as not
Add the dosage of the corundum coating of water) it is 300g/m2。
The drying temperature of step (3) is 100-150 DEG C, drying time 4-6 hours.
The corundum coating that the wet coating uses is made of by weight percentage following components: the corundum coating
It is made of by weight percentage following components: 325 mesh schmigels 83.45%, phenol-formaldehyde resin powder 5%, methenamine 0.5%, 325
Mesh silicon carbide 10%, CMC 0.5%, explosion-proof fiber 0.5%, aluminium powder 0.05%.Wherein, explosion-proof fiber is preferably that polypropylene is explosion-proof
Fiber JSA-3-3, softening point: 85 ± 10 DEG C.Each component is crushed after mixing.The matter of the corundum coating and water
Measuring volume ratio (g/ml) is preferably 1:1.
The method that the dry method coating preparation resistance to molten steel corrodes molding heat-insulating shield, it includes following steps:
(1) heat-insulating shield slurry is prepared, slurry is filled up into mold, when water exhausts fastly, corundum coating is uniformly spilt
In mold on slurry of the heat-insulating shield by steel face；
(2) moisture for utilizing pulp surface remnants, is smoothed out in suction strainer with trowel, and after stopping suction strainer, turnover mould is sent into
Dry kiln drying.
Preferably,
Step (1) the corundum coating is the fine powder corundum coating sieved with 100 mesh sieve.
The dosage of step (1) the corundum coating is about 300g/m2。
Step (2) drying time is 12-24 hours, and drying temperature is 100~150 DEG C.
The corundum coating is made of by weight percentage following components: 325 mesh schmigels 83.45%, phenolic resin
Powder 5%, methenamine 0.5%, 325 mesh silicon carbide 10%, CMC 0.5%, explosion-proof fiber 0.5%, aluminium powder 0.05%.Wherein,
Explosion-proof fiber is preferably polypropylene explosion-proof fiber JSA-3-3, softening point: 85 ± 10 DEG C.
Each component is crushed after mixing can be obtained powdered corundum coating.
In the present invention, it is preferred to, heat-insulating shield slurry used in the dry method coating and wet coating can be by following heavy
The group of amount part is grouped as: 20-50 parts of quartz sand, 10-30 parts of high alumina ceramic fiber, 10-30 parts of old newsprint, ceramic hollow ball 20-
40 parts.Wherein, ceramic hollow ball, that is, high alumina hollow sphere.
Detailed description of the invention
Fig. 1 is the heat-insulating shield photo that the coating of corundum coating is not used；
Fig. 2 is the heat-insulating shield photo that embodiment 3 is coated using corundum coating dry method；
Fig. 3 is the using effect photo that the heat-insulating shield of corundum coating coating is not used；
Fig. 4 is the using effect photo for the heat-insulating shield that embodiment 3 is coated using corundum coating dry method.
Specific embodiment
Below with reference to embodiment and Figure of description, the invention will be further described.Ceramic hollow ball in embodiment
Manufacturer be Yixing City Su Yu Refractory Co., ltd, high alumina ceramic fiber manufacturer be Zhejiang nation Buddhist nun's refractory fibre
Co., Ltd, explosion-proof fiber are polypropylene explosion-proof fiber JSA-3-3, softening point: 85 ± 10 DEG C.
The preparation of 1 conventional insulation sheet of embodiment
40 kilograms of quartz sands, 50 kilograms of high alumina ceramic fibers, 20 kilograms of old newsprints, 30 kilograms of ceramic hollow ball additions are stirred
It mixes tank pulping and the slurry being stirred is put into storage material slot after stirring 15 minutes, it is to be formed.
When molding, first the slurry being stirred in advance is quantitatively adding in molding die, suction strainer after pressing.The mud in suction strainer
Knife smoothes out, and stops suction strainer, and turnover mould holds the slab of heat-insulating shield with supporting plate, is sent into dry kiln drying；100 DEG C of drying 12
It is taken out after hour, according to its physical and chemical index of standard test and outer dimension, standard compliant storage, for use.
Embodiment 2 uses the preparation of the heat-insulating shield of corundum coating wet coating
Prepare corundum coating: the corundum coating that the dry method coating uses is by following components group by weight percentage
At: 325 mesh schmigels 83.45%, phenol-formaldehyde resin powder 5%, methenamine 0.5%, 325 mesh silicon carbide 10%, CMC 0.5%,
Explosion-proof fiber 0.5%, aluminium powder 0.05%.Each component is uniformly mixed, crush to get.Prepared corundum coating is added
The mass volume ratio of water, corundum coating and water be 1g/ml, then with rotary broom be coated onto embodiment 1 made from insulation
Plate by steel face, need 3 times repeatedly, each coated weight (be converted to not plus the powdered corundum coating of water) is 300g/m2, use
Supporting plate holds the heat-insulating shield after the coating of corundum coating, is fed again into dry kiln drying；
Taken out after being dried four hours at 100 DEG C, according to its physical and chemical index of standard test and outer dimension, it is standard compliant enter
Library, for use.
The preparation for the heat-insulating shield that embodiment 3 is coated using corundum coating dry method
Prepare corundum coating: the corundum coating that the dry method coating uses is by following components group by weight percentage
At: 325 mesh schmigels 83.45%, phenol-formaldehyde resin powder 5%, methenamine 0.5%, 325 mesh silicon carbide 10%, CMC 0.5%,
Explosion-proof fiber 0.5%, aluminium powder 0.05%.Each component is uniformly mixed, crush to get.
40 kilograms of quartz sands, 50 kilograms of high alumina ceramic fibers, 20 kilograms of old newsprints, 30 kilograms of ceramic hollow ball additions are stirred
It mixes tank pulping, after stirring 15 minutes, the slurry being stirred is filled up into mold, when water exhausts fastly, with 100 mesh standard sieves by powder
Last shape corundum coating is equably sprinkled upon heat-insulating shield in mold, and, by steel starch adhesive material, the dosage of corundum coating is 300g/m2；Benefit
It with the moisture content of pulp surface remnants, is smoothed out in suction strainer with trowel, stops suction strainer, turnover mould holds heat-insulating shield with supporting plate
Slab is sent into dry kiln drying；It is taken out after being dried 12 hours at 100 DEG C, according to its physical and chemical index of standard test and shape ruler
It is very little, standard compliant storage, for use.
Test case 1
Heat-insulating shield made from embodiment 1-3 is tested for the property, test result is shown in Table 1.
Heat-insulating shield performance test table made from 1 embodiment 1-3 of table
By upper table data as it can be seen that being had using heat-insulating shield (embodiment 2 and embodiment 3) refractoriness after the coating of corundum coating
Obvious rising, shrinking percentage are decreased obviously, and surface is brighter and cleaner, thermal conductivity decline, the decline of ingotism rate.Especially embodiment
3 have used dry method coating, and effect is more obvious.
The conventional die castings heat-insulating shield of embodiment 1, because big using fibre weight in raw material, heat-insulating shield surface layer can not reach cause
Close planarization effects.It is overlying on the working face of heat-insulating shield and steel contacts using corundum coating, the sky of insulation plate surface can be filled up
Gap increases the smoothness of insulation plate surface, meanwhile, prevent molten steel and the direct area of heat-insulating shield；Meanwhile corundum coating and molten steel
It does not infiltrate, and corundum coating high temperature resistant, after steel ingot demoulding, the heat-insulating shield of included corundum coating is easy to and steel at cap mouth
Ingot removing, this sample can reach that cap mouth surface of steel ingot is bright and clean, carrot-free effect (see Fig. 1-4).
In addition, the dry method coating method of embodiment 3, is convenient for one-pass molding, it is easy to operate.It exhausts fastly to slurry water in mold
When, powdered corundum coating quantitative and even is sprinkled upon in mold on slurry with 100 mesh standard sieves.Utilize pulp surface remnants
Water, smoothed out in suction strainer with trowel.Bond strength is high, smears secondary baking when operating without wet process.
The above is merely preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention should be included in protection model of the invention
Within enclosing.
Claims (3)
1. a kind of resistance to molten steel corrodes molding heat-insulating shield, which is characterized in that the resistance to molten steel corrode molding with heat-insulating shield be using
Corundum coating is coated to obtain in heat-insulating shield by steel face；
Described to coat applied to dry method, it includes following steps:
(1) heat-insulating shield slurry is prepared, slurry is filled up into mold, when water exhausts fastly, corundum coating is uniformly sprinkled upon mould
In having on slurry of the heat-insulating shield by steel face；
(2) moisture for utilizing pulp surface remnants, is smoothed out in suction strainer with trowel, and after stopping suction strainer, turnover mould is sent into drying
Kiln drying；
The corundum coating is made of by weight percentage following components: 325 mesh schmigels 83.45%, phenol-formaldehyde resin powder
5%, methenamine 0.5%, 325 mesh silicon carbide 10%, CMC 0.5%, explosion-proof fiber 0.5%, aluminium powder 0.05%.
2. preparation method as described in claim 1, it is characterised in that: step (1) the corundum coating is to sieve with 100 mesh sieve
The fine powder corundum coating arrived.
3. preparation method as described in claim 1, it is characterised in that: step (2) drying time is 12-24 hours, is dried
Dry temperature is 100-150 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510136780.7A CN106146044B (en) | 2015-03-26 | 2015-03-26 | A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510136780.7A CN106146044B (en) | 2015-03-26 | 2015-03-26 | A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof |
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| CN106146044B true CN106146044B (en) | 2019-03-05 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105161A (en) * | 1986-08-10 | 1987-02-11 | 辽宁省鞍山市陶瓷七厂 | A kind of composite heat-insulating shield |
| CN101195154A (en) * | 2007-12-19 | 2008-06-11 | 攀钢集团成都钢铁有限责任公司 | Casting mold for hollow steel ingot and producing method thereof |
| CN102850062A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | Corundum coating material |
-
2015
- 2015-03-26 CN CN201510136780.7A patent/CN106146044B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86105161A (en) * | 1986-08-10 | 1987-02-11 | 辽宁省鞍山市陶瓷七厂 | A kind of composite heat-insulating shield |
| CN101195154A (en) * | 2007-12-19 | 2008-06-11 | 攀钢集团成都钢铁有限责任公司 | Casting mold for hollow steel ingot and producing method thereof |
| CN102850062A (en) * | 2011-06-29 | 2013-01-02 | 宝山钢铁股份有限公司 | Corundum coating material |
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| CN106146044A (en) | 2016-11-23 |
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