CN101693791B - Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof - Google Patents
Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof Download PDFInfo
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- CN101693791B CN101693791B CN2009102103849A CN200910210384A CN101693791B CN 101693791 B CN101693791 B CN 101693791B CN 2009102103849 A CN2009102103849 A CN 2009102103849A CN 200910210384 A CN200910210384 A CN 200910210384A CN 101693791 B CN101693791 B CN 101693791B
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- continuous casting
- oxidation resistant
- resistant coatings
- temperature oxidation
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Abstract
The invention relates to a preparation process of continuous casting slab high-temperature oxidation resistant coatings, which is characterized in that less than 120 meshes of powder, reductant containing carbon, inorganic binders, surfactants, suspending agents and the like with the compositions such as 25-55 wt% SiO2, 10-20 wt% Al203, 11-23 wt% MgO and the like are respectively grinded and mixed evenly, then water is used to be mixed and stirred sufficiently evenly, and finally the density of the coatings are adjusted within 1200-1500 kg/m3. The coatings can not only be sprayed onto continuous casting slabs at normal temperature, but also be sprayed onto high-temperature casting slabs, form continuous whole protective coating layers under the action of high temperature, effectively reduce temperature drop of the casting slabs and oxidation burning loss in even heating process of a heating furnace without changing original performance of matrixes, and effectively decrease dilution of alloying elements on the surfaces of the casting slabs. After the casting slabs are out of the heating furnace, natural spalling capability of the coating layers is strong, and oxidation matrixes of the casting slabs are smooth. Raw materials of the oxidation resistant coatings are easy to be obtained, and the coatings have low cost and simple preparation process and are adaptable to oxidation resistance for various steels when being heated at 700-1300 DEG C/ 2-8 hours.
Description
Technical field
The invention belongs to paint field, relate to continuous casting slab high-temperature oxidation resistant coatings and preparation technology thereof specifically.
Background technology
Energy-saving and emission-reduction are targets that all industries of the whole world are pursued, especially for the higher iron and steel enterprise of energy consumption.Continuously cast bloom need be crossed in 1200 ℃ of left and right sides high temperature and the heat-processed of long period at the process furnace back warp before hot rolling, and this process makes that the oxidization burning loss of casting billet surface is very serious, and the oxidization burning loss rate reaches 0.5～2.5%.In order to reduce the oxidization burning loss of strand, and reduce strand surperficial temperature drop in course of conveying, brush antioxidizing paint,, improve steel quality to reduce the strand temperature drop and to improve lumber recovery at the high temperature casting billet surface.
In Chinese patent CN96109105.3 " high-temperature resistant coating and production method thereof ", a kind of high-temperature resistant coating is disclosed, it is characterized in that: transfer to mix by 1.5: 1 (weight ratio) by solid material and liquid material to form, its solid material consists of (weight percent): magnesia 70-75%, high-al clay 28-24%, pitch 1-0.5%, Graphite Powder 99 1-0.5%, liquid phase consists of (weight percent): water glass 70-75%, boric acid 2-1%, nitrogen sodium oxide 2-1%, water 23-26%.This coating can be used on position (parts) sprayings such as oxygen lance, drilling rod, air port, electrode, cinder notch, big gun cap, air pipe of blast furnace, elbow, taphole drilling machine iron staff, the last furnace shell inwall of building, cooling stave, the hotblast stove inwall of building, high-temperature pipe inwall, have the fire-resistant oxidation resistant effect, cost is lower.But this coating can not be used for pyrolytic coating, can only be used for cold spraying and just can reach high temperature resistant anti-oxidation effect.The insulation that can not be applicable to strand is anti-oxidation, and the dope layer difficult drop-off, brings adverse influence to hot-work.At heat treatment industry, general parts are to want fire-resistant oxidation resistant when heat-treating to the requirement of coating, but after heat treated, wish that coating easily peels off, and are convenient to processing.
In Chinese patent CN99114492.9 " a kind of refractory inorganic paint and compound method thereof ", introduced a kind of coating, this coating utilizes bauxitic clay, silicon carbide as aggregate, add white clay, add water glass again as binding agent, the weight ratio that the major ingredient of this refractory inorganic paint is formed is: bauxitic clay 26-35 part, silicon carbide 10-18 part, 6 parts of white claies, water glass 45-55 part (baume 40).The compound method of the coating of this patent is simple; but the fire-resistant oxidation resistant effect is not fine; there are not good wetting property and compactness; can not play a very good protection to the workpiece of being protected; can not spray under the hot conditions; can only on room temperature condition, spray, and only anti-ly under the temperature below 980 ℃, protect workpiece.
In Chinese patent 200510027741.X " a kind of high-temperature resistant coating and preparation method thereof ", introduced a kind of high-temperature resistant coating, it is characterized in that it comprises solid material and two kinds of components of liquid material: wherein the essentially consist of solid material component is: yttrium oxide 10-25%, zirconium white 10-25%, lucium 10-25%, glass powder 2-4%, water glass 40-50%, atlapulgite 3-5%.The essentially consist of liquid material is: borax 5-10%, sodium hydroxide 2-6%, water glass 40-55%, water 30-45%.Solid material and liquid material are stirred evenly with weight ratio mixing in 1: 1, just obtain high-temperature resistant coating.Though this coating has certain high temperature resistant, anti-oxidant and thermostability, but the cost of coating is too high, operation is numerous and diverse, and additive is too various, bad allotment, and be not suitable for industrial production and popularization.
Though above-mentioned these coating all have the anti-oxidation effect of good high-temperature to specified steel billet to a certain extent, these coating mostly are and are confined to normal temperature brushing drying and forming-film and static state high-temperature protection, have limited the popularization of this type of achievement.
Summary of the invention
It is lower to the objective of the invention is to overcome existing application of paints temperature, and energy dissipation is serious, with the rolling system of the reality present situation that is not complementary, thereby provides the antioxidizing paint of high temperature (below 1000 ℃) casting billet surface spraying;
Another object of the present invention is to propose the preparation technology of continuous casting slab high-temperature oxidation resistant coatings of the present invention.
The objective of the invention is to realize by the following technical solutions:
Continuous casting slab high-temperature oxidation resistant coatings provided by the invention comprises following component:
SiO
2 25～55wt％
SiO wherein
2, Al
2O
3With the massfraction of MgO powder with account for more than 65%;
Its preparation technology is ground to above-mentioned each component respectively below 120 orders, and evenly mixed, and the water thorough mixing stirs then, and final adjusting of water is coated with the density of slip at 1200～1500kg/m
3
Continuous casting slab high-temperature oxidation resistant coatings provided by the invention, preferably conforming to said components is ground to respectively below 120 orders at interior breeze, carbon containing reducer, mineral binder bond, tensio-active agent, suspension agent etc., mix, the water thorough mixing stirs then, and the density of finally regulating coating is at 1200～1500kg/m
3For making each component homodisperse of coating system and spraying the time be unlikely to plug nozzle, each component all need be ground to respectively below 120 orders.
The preparation technology who is provided is at first with after described powder, carbon containing reducer, suspension agent and the tensio-active agent mixing and stirring, adds described mineral binder bond, the material that mixes is added water again and regulates density.
Described breeze is to be selected from ores such as mica breeze, feldspar breeze, vermiculite breeze, silicon carbide breeze and some the clay of laminar silicate powder one or more;
Described carbon containing reducer comprises one or more in graphite, carbon black, coke powder and the coal dust;
Described mineral binder bond is phosphoric acid salt and a sodium silicate by weight percentage 1: the 0.7-1 mixing preparation forms.
In the above-mentioned continuous casting slab high-temperature oxidation resistant coatings provided by the invention, the cold spraying slurry density transfers to 1400～1500kg/m
3, the pyrolytic coating slurry density transfers to 1200～1300kg/m
3
This coating both can be sprayed on normal temperature billet surface drying and forming-film; can be painted on the casting billet surface of high temperature (below 1000 ℃) again; and under high temperature action, form continuous supercoat, and effectively reduce high temperature oxidation scaling loss in strand temperature drop and the process furnace, do not change the original performance of strand matrix.
Continuous casting slab high-temperature oxidation resistant coatings provided by the invention is a kind of coating with good high-temp antioxidizing effect, this coating can form continuous supercoat under high temperature action, reduce the strand temperature drop and improve lumber recovery, do not change the original performance of strand matrix, heating back coating has stronger self-flaking performance; The raw material of this coating is easy to get simultaneously, and is with low cost, and preparation technology is simple.
Compare with this class coating of prior art: its advantage and positively effect fully show as:
1. continuous casting slab high-temperature oxidation resistant coatings of the present invention is widely used in strand anti-oxidation 700～1300 ℃/2～8 hours whens heating.Coating is easily peeled off after the thermal treatment, and smooth no decarburization of casting billet surface and alloying element do not have leakage, can not increase the steel rolling defective.In 700～1300 ℃ of heat treatment processes; coating and matrix surface absorption and form the protective layer of one deck densification rapidly; prevented the infiltration of extraneous oxidizing gas effectively; the oxidation of matrix surface and the loss of decarburization and alloying element have been stoped; coating is in the sintering network state from start to finish; binder mixture is the viscosity molten state and is filled with the sintering network through pyroprocess in the system; seal billet surface in good condition, and the surface cooling process of moment makes owing to coating is strengthened with the remarkable different coating self-flaking performances that cause of matrix thermal expansivity after steel billet is come out of the stove.
2. continuous casting slab high-temperature oxidation resistant coatings of the present invention, spraying or brushing have realized in the time of moisture evaporation that function ingredients and binder mixture in matrix surface polymerization bonding, have formed fine and close coating behind steel surface.
3. continuous casting slab high-temperature oxidation resistant coatings of the present invention can satisfy in the directly spraying of the surface of strand below 1000 ℃.The phosphoric acid salt binding agent is the viscosity molten state and is filled with the sintering network through pyroprocess in the system, seal billet surface in good condition, compare with normal temperature brushing high-temp antioxidizing paint, be more suitable in steel rolling production-line, improved the practicality of coating greatly, reduce metallurgical energy loss, shortened the activity duration, improved enterprise competitiveness.
4. continuous casting slab high-temperature oxidation resistant coatings of the present invention can make the high temperature oxidation scaling loss of strand reduce by 50～80%, thereby greatly reduces the oxidization burning loss of strand in process furnace, and economic and social benefit is considerable.
Embodiment
Embodiment 1
Get zircon respectively, mica, albite, wollastonite, vermiculite, carbon dust etc. are pressed dry mash chemical ingredients: 3%ZrO
2, 12%Al
2O
3, 40%SiO
2, 15%MgO, 12%CaO, 3%Fe
2O
3, 5%C, 5%Na
2O, 5%ZnO are ground to respectively below 120 orders, carry out mixing of materials, and it is 1200kg/m that adding binder mixture and water are adjusted to the density that finally is coated with slip
3, obtain continuous casting slab high-temperature oxidation resistant coatings I of the present invention.With the surface of this paint spay-coating, promptly form one deck canescence supercoat in 800 ℃ Q345B strand.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 60%, and coating can peel off naturally, and it is evenly bright and clean to peel off the back matrix surface, noresidue.
Embodiment 2
Get zircon respectively, mica, albite, wollastonite, vermiculite, borax, carbon dust etc. are pressed dry mash chemical ingredients: 4%ZrO
2, 11%Al
2O
3, 30%SiO
2, 15%MgO, 12%CaO, 3%Fe
2O
3, 4%B
2O
3, 10%C, 6%Na
2O, 5%ZnO are ground to respectively below 120 orders, carry out mixing of materials, and it is 1300kg/m that adding binder mixture and water are adjusted to the density that finally is coated with slip
3, obtain continuous casting slab high-temperature oxidation resistant coatings II of the present invention.With the surface of this paint spay-coating, promptly form one deck canescence supercoat in 1000 ℃ SS400 strand.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 70%, and coating can peel off naturally, and it is evenly bright and clean to peel off the back matrix surface, noresidue.
Embodiment 3
Get zircon respectively, mica, potassium felspar sand, silicon carbide, talcum powder, carbon dust etc. are pressed dry mash chemical ingredients: 3%ZrO
2, 13%Al
2O
3, 44%SiO
2, 12%MgO, 13%CaO, 2%ZnO, 7%C, 3%Na
2O, 3%K
2O is ground to respectively below 120 orders, carries out mixing of materials, and it is 1200kg/m that adding binder mixture and water are adjusted to the density that finally is coated with slip
3, obtain continuous casting slab high-temperature oxidation resistant coatings III of the present invention.With the surface of this paint spay-coating, promptly form one deck canescence supercoat in 900 ℃ Q345B strand.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 70%, and coating can peel off naturally, and it is evenly bright and clean to peel off the back matrix surface, noresidue.
Embodiment 4
Get zircon respectively, mica, potassium felspar sand, borax, vermiculite, carbon dust etc. are pressed dry mash chemical ingredients: 4%ZrO
2, 10%Al
2O
3, 50%SiO
2, 10%MgO, 10%CaO, 3%ZnO, 5%C, 3%B
2O 3%Na
2O, 2%K
2O is ground to respectively below 120 orders, carries out mixing of materials, and it is 1400kg/m that adding binder mixture and water are adjusted to the density that finally is coated with slip
3, obtain continuous casting slab high-temperature oxidation resistant coatings IV of the present invention.With the surface of this paint spay-coating in the SS400 of room temperature strand, after heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection; the oxidization burning loss rate reduces more than 65%; and coating can be peeled off naturally, and it is evenly bright and clean to peel off the back matrix surface, noresidue.
Claims (9)
1. continuous casting slab high-temperature oxidation resistant coatings is characterized in that:
The powder of described coating adopts following component:
SiO
2 25～55wt％
Al
2O
3 10～20wt％
CaO 5～20wt％
MgO 11～23wt％
ZrO
2 1～8wt％
Fe
2O
3 0～10wt％
C 1～10wt％
B
2O
3 0～10wt％
ZnO 2～10wt％
K
2O 1～10wt％
Na
2O 1～10wt％
SiC 0～10wt％
Float pearl 0～8wt%
SiO wherein
2, Al
2O
3With the massfraction of MgO powder with account for more than 65%;
The granularity of above-mentioned each component is below 120 orders;
The final adjusting is coated with the density of slip at 1200～1500kg/m
3
2. continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 1, it is characterized in that: the described slip that finally is coated with is that powder, carbon containing reducer, mineral binder bond, suspension agent, tensio-active agent and water by described component mixes, wherein below granularity 120 orders of carbon containing reducer, mineral binder bond, suspension agent, each component of tensio-active agent.
3. continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 2 is characterized in that: the composition of mineral binder bond is phosphoric acid salt and sodium silicate by weight percentage 1: 0.7-1.
4. as each described continuous casting slab high-temperature oxidation resistant coatings of claim 1 to 3, it is characterized in that: the described density that finally is coated with slip is: the cold spraying slurry density transfers to 1400～1500kg/m
3, the pyrolytic coating slurry density transfers to 1200～1300kg/m
3
5. the preparation technology of a continuous casting slab high-temperature oxidation resistant coatings may further comprise the steps:
1) choose the powder of described coating by following component:
2) above-mentioned each component is ground to respectively below 120 orders;
3) with after the described powder mixing and stirring, add mineral binder bond, again the material that mixes is added water and regulate density, the final adjusting is coated with the density of slip at 1200～1500kg/m
3
6. the preparation technology of continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 5, it is characterized in that: in described step 3), the described Auto-regulating System of Density of Heavy Medium that finally is coated with slip is: the cold spraying slurry density transfers to 1400～1500kg/m
3, the pyrolytic coating slurry density transfers to 1200～1300kg/m
3
7. the preparation technology of continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 5, it is characterized in that: in described step 3), described mineral binder bond is phosphoric acid salt and a sodium silicate by weight percentage 1: the 0.7-1 mixing preparation forms, and described mineral binder bond is ground to below 120 orders.
8. the preparation technology of continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 7, it is characterized in that: in described step 3), add carbon containing reducer, suspension agent, tensio-active agent in the powder of described component, wherein carbon containing reducer, suspension agent, each component of tensio-active agent are ground to respectively below 120 orders.
9. the preparation technology of continuous casting slab high-temperature oxidation resistant coatings as claimed in claim 8, it is characterized in that: in described step 3), at first with after described powder, carbon containing reducer, suspension agent and the tensio-active agent mixing and stirring, add described mineral binder bond, again the material that mixes is added water and regulate density.
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| CN2009102103849A CN101693791B (en) | 2009-11-02 | 2009-11-02 | Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof |
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| CN101693791B true CN101693791B (en) | 2011-07-20 |
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