CN104497653A - High-temperature anti-oxidation coating for steel billet of plain carbon steel and preparation method of high-temperature anti-oxidation coating - Google Patents
High-temperature anti-oxidation coating for steel billet of plain carbon steel and preparation method of high-temperature anti-oxidation coating Download PDFInfo
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- CN104497653A CN104497653A CN201410845957.6A CN201410845957A CN104497653A CN 104497653 A CN104497653 A CN 104497653A CN 201410845957 A CN201410845957 A CN 201410845957A CN 104497653 A CN104497653 A CN 104497653A
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Abstract
The invention relates to a high-temperature anti-oxidation coating for a steel billet of plain carbon steel and a preparation method of the high-temperature anti-oxidation coating. The technical scheme is as follows: a component A and a component B which are sub-packaged are mixed according to the mass ratio of (0.8-2):1 and are mechanically stirred when the high-temperature anti-oxidation coating is used, wherein the component A is prepared from the chemical components in percentage by mass: 20-35% of alumina powder, 20-30% of silicon dioxide powder, 15-25% of magnesia powder, 5-15% of calcium oxide powder, 5-10% of zirconium dioxide powder, 2-5% of sodium carbonate powder, 2-5% of potassium carbonate powder, 2-5% of iron oxide powder and 1-5% of aluminum powder; and the component B is prepared from the chemical components in percentage by mass: 1-5% of (CH2O)n, 4-10% of (C12H22O11)n, 5-15% of (C6H10O5)n, 0.5-2% of polyvinyl alcohol, 0.1-1% of sodium carboxymethylcellulose, 0.1-0.8% of hydroxyethyl cellulose and the balance of water. The high-temperature anti-oxidation coating has the characteristics of good anti-oxidation effect, high applicable temperature, self-falling capacity, safety, environment friendliness and low cost.
Description
Technical field
The invention belongs to metallic surface high-temp antioxidizing paint technical field.Particularly relate to a kind of straight carbon steel steel billet high-temp antioxidizing paint and preparation method thereof.
Background technology
In rolling process, first utilize the mode pushing away steel to be transported in process furnace by steel billet and it is heated, after steel billet is heated to preset temperature, then is transported in milling train and is rolled.For the common steel billet of rolling, the temperature of process furnace is set to 1100 ~ 1300 DEG C usually.At this temperature, billet oxidization is very serious, can produce many disadvantageous effects:
1) amount of oxidation loss accounts for total mass 0.8 ~ 2%, reduces the recovery rate that steel are produced;
2) steel billet is after heating high temperature oxidation scaling loss, and poor surface quality, not only cause the dilution of the serious decarburization of billet surface and alloying element, and rolling can produce a large amount of surface imperfection, affect the final quality of product;
3) during process furnace heating steel billet, the iron scale of generation comes off in stove, if be deposited in furnace bottom for a long time, can affect the operating mode of process furnace, can be forced to blowing out to remove the iron scale of accumulation time serious, and impact is normally produced.
The most effective means of current people research is protective atmosphere method and high temperature coating method.Protective atmosphere method is subject to the restriction of multiple factors, as safety and environment protection, high in cost of production in the preparation of shielding gas and accumulating, use procedure.
Chinese scholars adopts high temperature coating method to carry out large quantifier elimination to the oxidation behavior in steel billet heat treatment process, proposes the method that some conveniently use the anti-oxidation of coating.But practical application effect is not also very desirable, and use range is restricted: " one is applied to the heat treated antioxidant coating of superalloy " (CN200910243717.08) patented technology, this technology is only applicable to the anti-oxidant of silicon steel, and is not suitable for the anti-oxidant of straight carbon steel; " a kind of stainless steel high temperature oxidation resistance paint and application thereof " (CN200810054883.9) patented technology, this technology is only applicable to the anti-oxidant of nickel chromium stainless steel, does not also have universality; " anti-oxidation coating for heat treatment of a kind of iron and steel and preparation method thereof " (CN201110434766.7) patented technology, though this technology can be applied to the anti-oxidant of carbon steel or steel alloy and use temperature is high, Cr
2o
3content is 2 ~ 5wt%, not only considerably increases the cost of coating, and is not suitable for the anti-oxidant of low value-added straight carbon steel, and the chromium ion of high-valence state can pollute environment, affects HUMAN HEALTH.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide that a kind of oxidation-protective effect is good, Applicable temperature is high, product surface quality is high, certainly comes off, safety and environmental protection and straight carbon steel steel billet high-temp antioxidizing paint with low cost and preparation method thereof.
For achieving the above object, the technical solution used in the present invention is: described high-temp antioxidizing paint is made up of component A and B component packing.
Chemical composition and the content thereof of described component A are: aluminum oxide powder is 20 ~ 35wt%, silicon dioxide powder is 20 ~ 30wt%, magnesia powder is 15 ~ 25wt%, calcium oxide powder is 5 ~ 15wt%, titanium dioxide zirconium powder is 5 ~ 10wt%, and sodium carbonate powder is 2 ~ 5wt%, and salt of wormwood powder is 2 ~ 5wt%, brown iron oxide is 2 ~ 5wt%, and aluminium powder is 1 ~ 5wt%.Mixing, packages spare.
Chemical composition and the content thereof of described B component is, (CH
2o)
nbe 1 ~ 5wt%, (C
12h
22o
11)
nbe 4 ~ 10wt%, (C
6h
10o
5)
nbe 5 ~ 15wt%, polyvinyl alcohol is 0.5 ~ 2wt%, and Xylo-Mucine is 0.1 ~ 1wt%, and Natvosol is 0.1 ~ 0.8wt%, and surplus is water.Mixing, packages spare.
Al in described aluminum oxide powder
2o
3content >98wt%, particle diameter≤48 μm of aluminum oxide powder.
SiO in described silicon dioxide powder
2content >99wt%, particle diameter≤48 μm of silicon dioxide powder.
Content of MgO >90wt% in described magnesia powder, particle diameter≤75 μm of magnesia powder.
CaO content >95wt% in described calcium oxide powder, particle diameter≤75 μm of calcium oxide powder.
ZrO in described titanium dioxide zirconium powder
2content >90wt%, particle diameter≤48 μm of titanium dioxide zirconium powder.
Na in described sodium carbonate powder
2cO
3content>=99wt%, particle diameter≤48 μm of sodium carbonate powder.
K in described salt of wormwood powder
2cO
3content>=99wt%, particle diameter≤48 μm of salt of wormwood powder.
Fe in described brown iron oxide
2o
3content >95wt%, particle diameter≤58 μm of brown iron oxide.
Al content >99wt% in described aluminium powder, particle diameter≤38 μm of aluminium powder.
The using method of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present invention: first by the mass ratio of component A and B component for (0.8 ~ 2) ︰ 1 mixes, mechanical stirring 30 ~ 200min; Again by stir after high-temp antioxidizing paint direct spraying or brush at billet surface, coat-thickness is 0.1 ~ 0.5mm.
Owing to adopting technique scheme, the present invention compared with prior art has following positively effect:
1, Applicable temperature is high.There is Na in the coating (hereinafter referred to as coating) that the straight carbon steel steel billet high-temp antioxidizing paint adopting the present invention to prepare obtains simultaneously
2cO
3, K
2cO
3etc. material and the Al of low melting point
2o
3, SiO
2, dystectic material such as MgO, and between each composition of coating, there is more complicated n-tuple relation, can play a protective role to matrix in 1100 ~ 1400 DEG C of (being greater than 3 hours) temperature ranges.
2, oxidation-protective effect is good.Mainly response type protection mechanism, oxidation-reduction type protection mechanism and inorganic laminated obstruct mechanism three kinds of coefficient results of mechanism.Along with temperature raises in process furnace, the Fe in the micro-oxidation iron sheet on steel surface and coating
2o
3with the Al in coating
2o
3, SiO
2there is chemical reaction with MgO etc., form the thickness melt film of thin semi-melting state, evenly and cover securely on matrix surface, completely cut off contacting of atmosphere and matrix, reached the protection object in heat-processed.Secondly, first the aluminium powder in coating reacts with stove internal oxidition atmosphere, causes the active media near coating poor, and can not have an effect with matrix, play a protective role.Again, the activated alumina that reaction is formed is attached to workpiece surface, adds the density of melting film, further increases the provide protection of coating.Solid powder particle size of the present invention is less and have obvious grain composition; at high temperature all there is stratiform mechanism; inorganic melt can cause interlamellar spacing to broaden to the effect of lamella; the closed filling effect of bedding void is realized by Intercalation reaction; material diffusion in heat-processed is effectively intercepted, thus plays a protective role.The oxidation-protective effect of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present invention is more than 70%.
3, certainly come off.The linear expansivity of plain steel 11 ~ 15/ DEG C, Al
2o
3linear expansivity <4 × 10
-6/ DEG C, SiO
2linear expansivity <1.5 × 10
-6/ DEG C, ZrO
2linear expansivity <10 × 10
-6/ DEG C, the linear expansivity of the coated thread coefficient of expansion and plain steel differs greatly, and during chilling, coating easily comes off.
4, product surface quality is high.First, because coating has excellent oxidation-protective effect and from falling-off effect, before billet rolling, the zone of oxidation that once oxidation is formed comes off with inoxidzable coating, billet surface is relatively cleaner, and iron scale is obviously reduced by the phenomenon of pricking into steel billet, directly enhances the surface quality of steel billet; Secondly, due at high temperature coating densification, completely cut off contacting of atmosphere and matrix, Decarburized depth reduces by more than 80%, and alloying element dilution reduces more than 70%, indirectly improves the surface quality of steel billet.
5, safety and environmental protection, preparation is simple, easy to use.Straight carbon steel steel billet high-temp antioxidizing paint prepared by the present invention is water-based paint, and solid matter is mainly the inorganic non-metallic oxide compound (as aluminum oxide, silicon-dioxide and magnesium oxide etc.) had no side effect, and liquid is carbohydrate solutions; During use, simple mechanical agitation methods will be adopted to get final product direct spraying or brush on steel billet.
6, with low cost.Straight carbon steel steel billet high-temp antioxidizing paint starting material prepared by the present invention are cheap and easy to get; Preparation and use procedure simple and convenient, low for equipment requirements, facility investment is few; Unit surface coating consumption is few.
Therefore, the present invention have that oxidation-protective effect is good, Applicable temperature is high, product surface quality is high, certainly come off, safety and environmental protection and feature with low cost.
Embodiment
Below in conjunction with embodiment, the invention will be further described, the restriction not to its protection domain.
For avoiding repetition, first by as follows for the raw material Unify legislation involved by this embodiment, repeat no more in embodiment:
Al in described aluminum oxide powder
2o
3content >98wt%, particle diameter≤48 μm of aluminum oxide powder.
SiO in described silicon dioxide powder
2content >99wt%, particle diameter≤48 μm of silicon dioxide powder.
Content of MgO >90wt% in described magnesia powder, particle diameter≤75 μm of magnesia powder.
CaO content >95wt% in described calcium oxide powder, particle diameter≤75 μm of calcium oxide powder.
ZrO in described titanium dioxide zirconium powder
2content >90wt%, particle diameter≤48 μm of titanium dioxide zirconium powder.
Na in described sodium carbonate powder
2cO
3content>=99wt%, particle diameter≤48 μm of sodium carbonate powder.
K in described salt of wormwood powder
2cO
3content>=99wt%, particle diameter≤48 μm of salt of wormwood powder.
Fe in described brown iron oxide
2o
3content >95wt%, particle diameter≤58 μm of brown iron oxide.
Al content >99wt% in described aluminium powder, particle diameter≤38 μm of aluminium powder.
embodiment 1
A kind of straight carbon steel steel billet high-temp antioxidizing paint and preparation method thereof.Described high-temp antioxidizing paint is made up of component A and B component packing.
Chemical composition and the content thereof of described component A are: aluminum oxide powder is 20 ~ 25wt%, silicon dioxide powder is 26 ~ 30 wt%, magnesia powder is 15 ~ 20wt%, calcium oxide powder is 5 ~ 9wt%, titanium dioxide zirconium powder is 7 ~ 10wt%, and sodium carbonate powder is 4 ~ 5wt%, and salt of wormwood powder is 2 ~ 3wt%, brown iron oxide is 4 ~ 5wt%, and aluminium powder is 1 ~ 3wt%.Mixing, packages spare.
Chemical composition and the content thereof of described B component is, (CH
2o)
nbe 1 ~ 3wt%, (C
12h
22o
11)
nbe 4 ~ 6wt%, (C
6h
10o
5)
nbe 11 ~ 15wt%, polyvinyl alcohol is 0.5 ~ 1wt%, and Xylo-Mucine is 0.7 ~ 1wt%, and Natvosol is 0.1 ~ 0.4wt%, and surplus is water.Mixing, packages spare.
The using method of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present embodiment: first by the mass ratio of component A and B component for (0.8 ~ 1.2) ︰ 1 mixes, mechanical stirring 30 ~ 90min; Again by stir after high-temp antioxidizing paint direct spraying or brush at billet surface, coat-thickness is 0.1 ~ 0.3mm.
embodiment 2
A kind of straight carbon steel steel billet high-temp antioxidizing paint and preparation method thereof.Described high-temp antioxidizing paint is made up of component A and B component packing.
Chemical composition and the content thereof of described component A are: aluminum oxide powder is 25 ~ 30wt%, silicon dioxide powder is 23 ~ 27wt%, magnesia powder is 17 ~ 22wt%, calcium oxide powder is 8 ~ 12wt%, titanium dioxide zirconium powder is 6 ~ 9wt%, and sodium carbonate powder is 3 ~ 4wt%, and salt of wormwood powder is 3 ~ 4wt%, brown iron oxide is 3 ~ 4wt%, and aluminium powder is 2 ~ 4wt%.Mixing, packages spare.
Chemical composition and the content thereof of described B component is, (CH
2o)
nbe 2 ~ 4wt%, (C
12h
22o
11)
nbe 6 ~ 8wt%, (C
6h
10o
5)
nbe 8 ~ 12wt%, polyvinyl alcohol is 1 ~ 1.5wt%, and Xylo-Mucine is 0.4 ~ 0.7wt%, and Natvosol is 0.3 ~ 0.6wt%, and surplus is water.Mixing, packages spare.
The using method of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present embodiment: first by the mass ratio of component A and B component for (1.2 ~ 1.6) ︰ 1 mix, mechanical stirring 90 ~ 140min; Again by stir after high-temp antioxidizing paint direct spraying or brush at billet surface, coat-thickness is 0.2 ~ 0.4mm.
embodiment 3
A kind of straight carbon steel steel billet high-temp antioxidizing paint and preparation method thereof.Described high-temp antioxidizing paint is made up of component A and B component packing.
Chemical composition and the content thereof of described component A are: aluminum oxide powder is 30 ~ 35wt%, silicon dioxide powder is 20 ~ 24 wt%, magnesia powder is 18 ~ 25wt%, calcium oxide powder is 9 ~ 15wt%, titanium dioxide zirconium powder is 5 ~ 8wt%, and sodium carbonate powder is 2 ~ 3wt%, and salt of wormwood powder is 3 ~ 5wt%, brown iron oxide is 2 ~ 3wt%, and aluminium powder is 2 ~ 5wt%.Mixing, packages spare.
Chemical composition and the content thereof of described B component is, (CH
2o)
nbe 3 ~ 5wt%, (C
12h
22o
11)
nbe 8 ~ 10wt%, (C
6h
10o
5)
nbe 5 ~ 9wt%, polyvinyl alcohol is 1.5 ~ 2wt%, and Xylo-Mucine is 0.1 ~ 0.4wt%, and Natvosol is 0.5 ~ 0.8wt%, and surplus is water.Mixing, packages spare.
The using method of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present embodiment: first by the mass ratio of component A and B component for (1.6 ~ 2) ︰ 1 mix, mechanical stirring 140 ~ 200min; Again by stir after high-temp antioxidizing paint direct spraying or brush at billet surface, coat-thickness is 0.3 ~ 0.5mm.
The present invention compared with prior art has following positively effect:
1, Applicable temperature is high.There is Na in the coating (hereinafter referred to as coating) that the straight carbon steel steel billet high-temp antioxidizing paint adopting the present invention to prepare obtains simultaneously
2cO
3, K
2cO
3etc. material and the Al of low melting point
2o
3, SiO
2, dystectic material such as MgO, and between each composition of coating, there is more complicated n-tuple relation, can play a protective role to matrix in 1100 ~ 1400 DEG C of (being greater than 3 hours) temperature ranges.
2, oxidation-protective effect is good.Mainly response type protection mechanism, oxidation-reduction type protection mechanism and inorganic laminated obstruct mechanism three kinds of coefficient results of mechanism.Along with temperature raises in process furnace, the Fe in the micro-oxidation iron sheet on steel surface and coating
2o
3with the Al in coating
2o
3, SiO
2there is chemical reaction with MgO etc., form the thickness melt film of thin semi-melting state, evenly and cover securely on matrix surface, completely cut off contacting of atmosphere and matrix, reached the protection object in heat-processed.Secondly, first the aluminium powder in coating reacts with stove internal oxidition atmosphere, causes the active media near coating poor, and can not have an effect with matrix, play a protective role.Again, the activated alumina that reaction is formed is attached to workpiece surface, adds the density of melting film, further increases the provide protection of coating.Solid powder particle size of the present invention is less and have obvious grain composition; at high temperature all there is stratiform mechanism; inorganic melt can cause interlamellar spacing to broaden to the effect of lamella; the closed filling effect of bedding void is realized by Intercalation reaction; material diffusion in heat-processed is effectively intercepted, thus plays a protective role.The oxidation-protective effect of straight carbon steel steel billet high-temp antioxidizing paint prepared by the present invention is more than 70%.
3, certainly come off.The linear expansivity of plain steel 11 ~ 15/ DEG C, Al
2o
3linear expansivity <4 × 10
-6/ DEG C, SiO
2linear expansivity <1.5 × 10
-6/ DEG C, ZrO
2linear expansivity <10 × 10
-6/ DEG C, the linear expansivity of the coated thread coefficient of expansion and plain steel differs greatly, and during chilling, coating easily comes off.
4, product surface quality is high.First, because coating has excellent oxidation-protective effect and from falling-off effect, before billet rolling, the zone of oxidation that once oxidation is formed comes off with inoxidzable coating, billet surface is relatively cleaner, and iron scale is obviously reduced by the phenomenon of pricking into steel billet, directly enhances the surface quality of steel billet; Secondly, due at high temperature coating densification, completely cut off contacting of atmosphere and matrix, Decarburized depth reduces by more than 80%, and alloying element dilution reduces more than 70%, indirectly improves the surface quality of steel billet.
5, safety and environmental protection, preparation is simple, easy to use.Straight carbon steel steel billet high-temp antioxidizing paint prepared by the present invention is water-based paint, and solid matter is mainly the inorganic non-metallic oxide compound (as aluminum oxide, silicon-dioxide and magnesium oxide etc.) had no side effect, and liquid is carbohydrate solutions; During use, simple mechanical agitation methods will be adopted to get final product direct spraying or brush on steel billet.
6, with low cost.Straight carbon steel steel billet high-temp antioxidizing paint starting material prepared by the present invention are cheap and easy to get; Preparation and use procedure simple and convenient, low for equipment requirements, facility investment is few; Unit surface coating consumption is few.
Therefore, the present invention have that oxidation-protective effect is good, Applicable temperature is high, product surface quality is high, certainly come off, safety and environmental protection and feature with low cost.
Claims (11)
1. a preparation method for straight carbon steel steel billet high-temp antioxidizing paint, is characterized in that described high-temp antioxidizing paint is made up of component A and B component packing; During use, by the mass ratio of component A and B component for (0.8 ~ 2) ︰ 1 mixes, mechanical stirring 30 ~ 200min;
Chemical composition and the content thereof of described component A are: aluminum oxide powder is 20 ~ 35wt%, silicon dioxide powder is 20 ~ 30wt%, magnesia powder is 15 ~ 25wt%, calcium oxide powder is 5 ~ 15wt%, titanium dioxide zirconium powder is 5 ~ 10wt%, and sodium carbonate powder is 2 ~ 5wt%, and salt of wormwood powder is 2 ~ 5wt%, brown iron oxide is 2 ~ 5wt%, and aluminium powder is 1 ~ 5wt%; Mixing, packages spare;
Chemical composition and the content thereof of described B component is, (CH
2o)
nbe 1 ~ 5wt%, (C
12h
22o
11)
nbe 4 ~ 10wt%, (C
6h
10o
5)
nbe 5 ~ 15wt%, polyvinyl alcohol is 0.5 ~ 2wt%, and Xylo-Mucine is 0.1 ~ 1wt%, and Natvosol is 0.1 ~ 0.8wt%, and surplus is water; Mixing, packages spare.
2. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the Al in described aluminum oxide powder
2o
3content >98wt%, particle diameter≤48 μm of aluminum oxide powder.
3. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the SiO in described silicon dioxide powder
2content >99wt%, particle diameter≤48 μm of silicon dioxide powder.
4. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the content of MgO >90wt% in described magnesia powder, particle diameter≤75 μm of magnesia powder.
5. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the CaO content >95wt% in described calcium oxide powder, particle diameter≤75 μm of calcium oxide powder.
6. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the ZrO in described titanium dioxide zirconium powder
2content >90wt%, particle diameter≤48 μm of titanium dioxide zirconium powder.
7. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the Na in described sodium carbonate powder
2cO
3content>=99wt%, particle diameter≤48 μm of sodium carbonate powder.
8. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the K in described salt of wormwood powder
2cO
3content>=99wt%, particle diameter≤48 μm of salt of wormwood powder.
9. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the Fe in described brown iron oxide
2o
3content >95wt%, particle diameter≤58 μm of brown iron oxide.
10. the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to claim 1, is characterized in that the Al content >99wt% in described aluminium powder, particle diameter≤38 μm of aluminium powder.
11. 1 kinds of straight carbon steel steel billet high-temp antioxidizing paints, is characterized in that described straight carbon steel steel billet high-temp antioxidizing paint is the straight carbon steel steel billet high-temp antioxidizing paint prepared by the preparation method of straight carbon steel steel billet high-temp antioxidizing paint according to any one of claim 1 ~ 10.
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|---|---|---|---|
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| CN106010123A (en) * | 2016-07-14 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Oil protective coating composition as well as application thereof, and production method of titanium tubes |
| CN106189686A (en) * | 2016-07-14 | 2016-12-07 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of oiliness protective coating compositions and application thereof and the production method of titanium pipe |
| CN106189684A (en) * | 2016-07-14 | 2016-12-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Aqueous protective coating compositions and application thereof and the production method of titanium pipe |
| CN106191415A (en) * | 2016-07-13 | 2016-12-07 | 苏州市虎丘区浒墅关弹簧厂 | The heat treatment of a kind of bearing wavy spring improves technique |
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| CN106189685B (en) * | 2016-07-14 | 2019-01-25 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of production method of aqueous protective coating composition and its application and titanium tube |
| CN111117308A (en) * | 2019-12-31 | 2020-05-08 | 河钢股份有限公司承德分公司 | High-temperature-resistant anti-oxidation coating and preparation method and application thereof |
| CN111234574A (en) * | 2020-02-19 | 2020-06-05 | 三门峡阳光铸材有限公司 | Decarburizing coating for lost foam cast steel |
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