CN100532466C - High temperature common mild steel anti-oxidation coating and application thereof - Google Patents
High temperature common mild steel anti-oxidation coating and application thereof Download PDFInfo
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- CN100532466C CN100532466C CNB2006100762570A CN200610076257A CN100532466C CN 100532466 C CN100532466 C CN 100532466C CN B2006100762570 A CNB2006100762570 A CN B2006100762570A CN 200610076257 A CN200610076257 A CN 200610076257A CN 100532466 C CN100532466 C CN 100532466C
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- high temperature
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- oxidation coating
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Abstract
The invention discloses a common low-carbon steel anti-oxidizing paint under high temperature, which comprises the following steps: grinding ore powder with Al2O3, SiO2, Fe2O3, metallurgical waste, reducer with carbon and inorganic binder to below 100 orders separately; blending evenly; stirring the powder with water evenly; adjusting the quantity of added water to the density of paint slurry to 1100-1500kg/m3; spraying the steel blank (below 1000 deg. c) before heat by rolling furnace directly; forming continuous protective layer to avoid oxidizing and damaging in the soaking course; saving the cost.
Description
Technical field
The invention belongs to paint field, specifically relate to a kind of high temperature common mild steel anti-oxidation coating and application thereof.
Background technology
Steel billet is in the heat-processed that all need pass through the long period in 1250 ℃ of left and right sides High Temperature Furnaces Heating Apparatuss before the hot rolling, and this process makes that the oxidization burning loss of 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 steel billet, need brush antioxidizing paint at billet surface usually, to improve lumber recovery, improve steel quality.
Disclose a kind of barrier material that prevents steel workpiece oxidation/decarburization when thermal treatment is heated at Chinese patent CN1632137A, it is by 10～20% glass powder, 33～30% quartz sands, 23～20% silica sands, 24～20% Al
2O
3, 2-10% C forms, and this coated material is applicable to the anti-oxidation/decarburization when heating in 800～1200 ℃/4～10 hours of various steel, can peel off naturally in subsequent cooling process.Steel workpiece surface after Overheating Treatment still has original metalluster, and the steel workpiece top layer still keeps original chemical ingredients; This coated material, easy to use, anti-oxidation/decarburization effect is good, and self-flaking performance is strong, and suitability is wide.But the application of temperature of this coating need be brushed the cooling earlier of hot steel below 1200 ℃ again, and the hot rolling that also will heat up once more then causes energy dissipation, and time-consuming taking a lot of work.
Disclose a kind of high-temp antioxidizing paint in Chinese patent CN1300805A, it is with SiO
2: 50～62 parts; Al
2O
3: 12～20 parts; Fe
2O
3: 2～8 parts; MgO:1～5 part; CaO:2～7 part; Na
2O:2～6 part; K
2Going into kiln after O:2～6 part FeO:1～5 parts is mixed founds under 800～1300 ℃ and was enamel in 3 hours, pulverize the cooling back, add a small amount of spinel, clay and water, ball milling makes its granularity be＜180 orders, and this coating particles is tiny, be suspension, be difficult for precipitation, do not need edger roll side pressure equipment, use simple, can in the time of 900-1200 ℃, use, and cost is low.But preparation technology's more complicated of this coating, must in advance coating composition be founded into enamel and cool off pulverizing then, time consumption and energy consumption, and the application of temperature of coating is not suitable for directly and brushes under the heat treated temperature before common hot rolling of steel billet below 1200 ℃.
Disclose a kind of oxidation-proof paint for high-temp heat-resistant steel at Chinese patent CN1179448A, this coating is based on precipitated barium carbonate, silica, adds fusing assistant boric acid, is vehicle with water glass.Under high temperature action, produce continuous glaze layer.Glaze layer spreadability is good, does not peel off, and does not gasify, and does not produce glaze and drips, and anti-oxidation performance is good, can prevent the oxidation in the high temperature steel life-time service.But this coating at be high-temp antioxidizing to high temperature steel, and coating needs can heat up use after cold spraying seasoning film forming, do not have universality.
A kind of MgO-Cr is disclosed at Chinese patent CN1036396A
2O
3It is the blank plates of silicon steels oxidation preventive coating for heating, with industrial magnesia is main raw material, preparation technology is simple, the coating cost is low, need not do any cleaning to slab before using, this coating has the good capacity of heat transmission and resistance to elevated temperatures, can not prolong slab heat-up time behind the use coating, the silicon steel final product quality is had no adverse effects the oxidization burning loss in the time of to prevent the silicon steel heating effectively; Also can improve the operating rate of process furnace simultaneously, increase considerably an amount of rolling of silicon steel.But this coating at be high-temp antioxidizing to blank plates of silicon steels, do not have universality.
Though above-mentioned these coating all have the anti-oxidation effect of good high-temperature to specified steel billet to a certain extent, but mostly these coating are to adopt the glass powder class and are the bonding medium, and the preparation of glass powder must be through complicated complete processing such as high temperature sintering and shrend grinding, and this has increased difficulty for the preparation technology in early stage of whole coating.
Summary of the invention
It is lower to the objective of the invention is to overcome existing application of paints temperature, cause energy dissipation, time-consuming taking a lot of work, and do not have universality, and the difficult defective of preparation technology in early stage of the raw material in the coating, thereby provide a kind of directly high temperature common mild steel anti-oxidation coating of red heat (below 1000 ℃) billet surface spraying before the hot rolling workshop process furnace, this coating can form continuous supercoat under high temperature action, can effectively reduce the high temperature oxidation scaling loss in preceding conveying of slab hot rolling and the equal thermal process, do not change the original performance of steel billet matrix, heating back coating self-flaking performance is strong; The raw material of this coating is easy to get simultaneously, and is with low cost, and preparation technology is simple, can reach extensively to be adapted to various steel anti-oxidation 800～1300 ℃/2～10 hours whens heating.
Another object of the present invention is to provide the application of described high temperature common mild steel anti-oxidation coating.
The objective of the invention is to realize by the following technical solutions:
High temperature common mild steel anti-oxidation coating provided by the invention comprises following component:
ZrO
2 3～10wt％
Al
2O
3 15～22wt％
SiO
2 20～45wt％
MgO 3～10wt％
B
2O
3 0～18wt％
Ca0 6～12wt％
Fe
2O
3 12～20wt％
C 1～20wt％
Na
2O 0～10wt％
K
2O 0～10wt％
Above-mentioned each component is ground to respectively below 100 orders, evenly mixed, stir with the water thorough mixing then, the add-on of water is coated with the density of slip at 1100～1500kg/m with final adjusting
3
High temperature common mild steel anti-oxidation coating provided by the invention, said components derives from breeze, metallurgical waste, carbon containing reducer and mineral binder bond, for 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 100 orders.
Described breeze can be selected one or more in ores such as zircon breeze, feldspar breeze, high alumina stone ore powder, wollastonite breeze and some the clay of laminar silicate powder for use;
Described metallurgical waste can be one or more of blast furnace or converter shrend slag, converter mud etc.;
Described carbon containing reducer comprises one or more in graphite, carbon black, coke powder and the coal dust;
Described mineral binder bond can be selected one or more in borate, silicates binding agent and the mineral binder bond after corresponding modification for use.
Above-mentioned high temperature common mild steel anti-oxidation coating provided by the invention both can have been brushed at normal temperature billet surface drying and forming-film; can be painted on the billet surface of high temperature (below 1000 ℃) again; and under high temperature action, form continuous supercoat; effectively reduce the high temperature oxidation scaling loss in preceding conveying of slab hot rolling and the heat-processed, and do not change the original performance of steel billet matrix.
High temperature common mild steel anti-oxidation coating provided by the invention is a kind of coating with good high-temp antioxidizing effect, and compare with this class coating of prior art: its advantage and positively effect fully show as:
1. high temperature common mild steel anti-oxidation coating of the present invention is widely used in multiple low-carbon (LC) steel billet anti-oxidation 800～1300 ℃/2～10 hours whens heating, and coating is very easily peeled off after the thermal treatment, and smooth no decarburization of steel slab surface and alloying element do not have leakage.In 800～1300 ℃ 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 and the decarburization of matrix surface have been stoped; coating is in sintered state from start to finish; system mesosilicic acid salt binding agent firmly holds onto other function ingredients and makes every effort to seal in good condition billet surface through pyroprocess, 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. high temperature common mild steel anti-oxidation coating of the present invention, spraying or brushing have realized in the time of moisture evaporation that function ingredients and binding agent in matrix surface polymerization bonding, have formed fine and close coating behind steel surface.
3. the selected most of raw material of high temperature common mild steel anti-oxidation coating of the present invention is cheap and easy to get, the employing of metallurgical waste and raw mineral materials is more arranged, realized the recycling of waste, turn waste into wealth, reduce the cost of coating simultaneously, made the anti-oxidation realistic meaning that has more of common iron and steel.
4. high temperature common mild steel anti-oxidation coating of the present invention can satisfy in the directly spraying of the surface of red-hot steel billet below 1000 ℃.Coating has been realized function ingredients and binding agent moment in matrix surface generation polymerization bonding in the system moisture evaporation, thereby relies on the heat of steel billet self to form fine and close coating.This and the antioxidizing paint normal temperature brushing that existing most of research is reported, the application art that heats up after the seasoning is compared, and has improved the practicality of coating greatly, has reduced metallurgical energy loss, has shortened the activity duration.
5. high temperature common mild steel anti-oxidation coating of the present invention can make the high temperature oxidation scaling loss of common low carbon steel billet reduce by 50～80%, can improve slab lumber recovery and output greatly, and economic and social benefit is considerable.
Embodiment
Embodiment 1,
Get zircon, albite, carbon black, borax, converter mud, water glass etc. respectively by dry mash chemical ingredients: 7%ZrO
2, 16%Al
2O
3, 22%SiO
2, 10%MgO, 4% B
2O
3, 8%CaO, 15%Fe
2O
3, 10%C, 8%Na
2O is ground to respectively below 100 orders, carries out mixing of materials, and adding water, to be adjusted to the density that finally is coated with slip be 1100kg/m
3, obtain high temperature common mild steel anti-oxidation coating I of the present invention.
With the surface of this paint spay-coating, promptly form one deck grey supercoat in 800 ℃ A36 steel billet.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, albite, high alumina stone, coal dust, wollastonite, slag, water glass etc. respectively by dry mash chemical ingredients: 10%ZrO
2, 22%Al
2O
3, 35%SiO
2, 5%MgO, 6%CaO, 12%Fe
2O
3, 5%C, 5%Na
2The O proportioning will be ground to respectively below 120 orders, carry out mixing of materials, and adding water, evenly to be diluted to the density that finally is coated with slip be 1500kg/m
3, obtain high temperature common mild steel anti-oxidation coating II of the present invention.
This coating is painted on 1000 ℃ Q235-B billet surface, promptly forms one deck grey supercoat.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, potassium felspar sand, high alumina stone, coke powder, wollastonite, borax, converter mud, water glass etc. respectively by dry mash chemical ingredients: 3%ZrO
2, 20%Al
2O
3, 20%SiO
2, 8%MgO, 6% B
2O
3, 10%CaO, 20%Fe
2O
3, 6%C, 4%K
2O, 3%Na
2O carries out mixing of materials, and powder is ground to 150 orders, add water stir to the density that finally is coated with slip be 1300kg/m
3, obtain high temperature common mild steel anti-oxidation coating III of the present invention.
Surface with the A36 steel billet of 900 ℃ of this paint spay-coatings promptly forms one deck grey supercoat.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, potassium felspar sand, high alumina stone, graphite, wollastonite, borax, slag etc. respectively by dry mash chemical ingredients 5%ZrO
2, 18%Al
2O
3, 40%SiO
2, 3%MgO, 4%B
2O
3, 12%CaO, 12%Fe
2O
3, 1%C, 3%K
2O, 2%Na
2O carries out raw material allotment, is ground to below 100 orders, and by powder: quality compares for 1:4 dilutes, and stirs, and the density that finally is coated with slip is at 1400kg/m
3, obtain high temperature common mild steel anti-oxidation coating IV of the present invention.
This coating is coated on the surface of 600 ℃ Q235-B steel billet, promptly forms one deck grey supercoat.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.
Claims (6)
1, a kind of high temperature common mild steel anti-oxidation coating comprises following component:
ZrO
2 3～10wt％
Al
2O
3 15～22wt％
SiO
2 20～45wt％
MgO 3～10wt％
B
2O
3 0～18wt％
CaO 6～12wt％
Fe
2O
3 12～20wt％
C 1～20wt％
Na
2O 0～10wt％
K
2O 0～10wt％
Above-mentioned each component is ground to respectively below 100 orders, evenly mixed, stir with the water thorough mixing then, the add-on of water is coated with the density of slip at 1100～1500kg/m with final adjusting
3
2, high temperature common mild steel anti-oxidation coating as claimed in claim 1 is characterized in that: the component in the described claim 1 derives from breeze, metallurgical waste, carbon containing reducer and mineral binder bond.
3, high temperature common mild steel anti-oxidation coating as claimed in claim 2 is characterized in that: described breeze is one or more in zircon breeze, feldspar breeze, high alumina stone ore powder, wollastonite breeze and the clay of laminar silicate powder.
4, high temperature common mild steel anti-oxidation coating as claimed in claim 2 is characterized in that: described metallurgical waste is one or more in blast furnace or converter shrend slag, the converter mud.
5, high temperature common mild steel anti-oxidation coating as claimed in claim 2 is characterized in that: described carbon containing reducer is to be selected from graphite, carbon black, coke powder and the coal dust one or more.
6, the application of the described high temperature common mild steel anti-oxidation coating of one of claim 1 to 5, this coating are brushed at normal temperature billet surface drying and forming-film, or are painted on 600 ℃-1000 ℃ the continuous supercoat of ordinary low-carbon steel surface formation.
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|---|---|---|---|
| CNB2006100762570A CN100532466C (en) | 2006-04-21 | 2006-04-21 | High temperature common mild steel anti-oxidation coating and application thereof |
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|---|---|---|---|
| CNB2006100762570A CN100532466C (en) | 2006-04-21 | 2006-04-21 | High temperature common mild steel anti-oxidation coating and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101058684A CN101058684A (en) | 2007-10-24 |
| CN100532466C true CN100532466C (en) | 2009-08-26 |
Family
ID=38864993
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| CN101058684A (en) | 2007-10-24 |
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