CN101462859B - High-temperature antioxidizing paint for lowering oxidation burning of steel in heating furnace - Google Patents
High-temperature antioxidizing paint for lowering oxidation burning of steel in heating furnace Download PDFInfo
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- CN101462859B CN101462859B CN2009100771287A CN200910077128A CN101462859B CN 101462859 B CN101462859 B CN 101462859B CN 2009100771287 A CN2009100771287 A CN 2009100771287A CN 200910077128 A CN200910077128 A CN 200910077128A CN 101462859 B CN101462859 B CN 101462859B
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Abstract
The invention relates to a high temperature anti-oxidation coating capable of reducing the oxidation burning loss of stainless steel in a heating furnace. The high temperature anti-oxidation coating is characterized in that the coating comprises solid materials consisting of 46 to 92 percent of basic filler and 8 to 54 percent of composite binder, and water which is 0.5 to 20 folds of the weight of the solid materials. The basic filler comprises several chemical components selected from silicon dioxide, alumina, magnesia, calcium oxide and boric oxide. The composite binder consists of several components selected from sodium silicate, lithium metasilicate and aluminum phosphate. The coating can be painted at the normal temperature or sprayed onto the surface of a stainless steel billet from the room temperature to 1,000 DEG C. The coating can form a protective coat at the high temperature, thereby greatly reducing the high temperature oxidation burning loss of stainless steel at 1,400 DEG C, and reducing the unit area oxidation burning loss by more than 90 percent. After stainless steel is drawn out of the furnace, the iron oxide scale can be fully stripped off under the actions of temperature reduction or high pressure water; the amount of the produced iron oxide scale is also obviously reduced; and the stainless steel surface quality is remarkably improved.
Description
Technical field
The invention belongs to paint field, specifically relate to a kind of high-temp antioxidizing paint that reduces stainless steel oxidization burning loss in process furnace.
Background technology
Heating before the stainless steel hot rolling of steel billet is a requisite important process in the producing stainless steel process.It is very abominable wherein to heat furnace inner environment, and furnace gas temperature is up to 1200 ℃-1350 ℃, and the temporary impact temperature can reach 1450 ℃.And contain H in the furnace gas
2O, CO
2, O
2Etc. the oxidisability composition.This environment causes the stainless steel billet oxidization serious, causes the oxidization burning loss of metal.High temperature oxidation also can cause the dilution of stainless steel surface alloying element, and the spinel structure iron scale of generation and the compact compact structure of stainless steel surface influences the following process surface quality of products simultaneously.
In order to reduce the oxidization burning loss of stainless steel steel billet, improve the surface quality of steel billet, a kind of effective means is exactly to apply antioxidizing paint at the stainless steel billet surface.Learn by consulting patent documentation, " a kind of antioxidation coating material of Nano silicate that is used for annealing billet in series " (application number 200710053874.3) is that 20-30% meets binding agent, 8-12% composite phosphate solidifying agent, 58-72% Smecta filler and forms by weight percent, can reduce the oxidization burning loss of austenitic stainless steel 0Cr18Ni9, increase the coating cost undoubtedly but the high-alumina fly in its raw material, zirconium white etc. are required to be nano-scale; And coating directly sprays steel billet and solidified in ten minutes, and the technological development present situation of going into stove with stainless steel continuous casting tandem rolling-Re base is not inconsistent, and has limited and has applied.
Summary of the invention
The objective of the invention is to; a kind of high-temp antioxidizing paint that reduces stainless steel oxidization burning loss in process furnace is provided, and this coating can be under 1000 ℃-1500 ℃, and protection stainless steel steel billet avoids the high temperature oxidation of environment; reduce oxidization burning loss, and steel billet is easy to de-scaling after coming out of the stove.Before stainless steel is gone into the stove heating, apply (spraying, brushing or dip-coating) continuously uniform high-temp antioxidizing paint at stainless steel surface, form anti-oxidation original coating.In process furnace, along with the rising of Stainless Steel Watch surface temperature, original coating fusion is gradually sprawled, and forms complete high viscosity fused film, has intercepted the intrusion of oxidizing gas, thereby reduces stainless high temperature oxidation scaling loss.
Purpose of the present invention is achieved by following technical proposals.
The water glass of 20%-90%, the potassium silicate of 0-20%, the lithium silicate of 0-15%, the aluminum phosphate of 2%-70% are mixed, obtain compound binding agent.
With contain respectively silicon-dioxide, aluminum oxide, magnesium oxide, calcium oxide, boron trioxide etc. wherein one or more mineral or chemical reagent mix, obtain solid packing, wherein silicon-dioxide 30%-90%, aluminium sesquioxide 1%-60%, magnesium oxide 1%-10%, calcium oxide 1%-5% and boron trioxide 0-5% form.
Compound binding agent 8%-54% and basic filler 46%-92% are mixed, obtain solid materials.
Solid materials is mixed with the water that is equivalent to solid materials weight 0.5-20 times, and dispersion, stirring or ball milling, make the solid matter particle granularity in the mixed system be narrower than 500 microns, the high-temp antioxidizing paint of the stainless steel oxidization burning loss in process furnace that is reduced.
With high-temp antioxidizing paint brushing, dip-coating or be sprayed at the stainless steel billet surface of room temperature to 1000 ℃, obtain inoxidzable coating, coat-thickness is the 0.1-2 micron.
Reduction stainless steel provided by the invention high-temp antioxidizing paint of oxidization burning loss in process furnace is coated with and imposes on billet surface, forms coating.After the stainless steel steel billet entered process furnace, under high temperature action, coating sintering, softening and fusion formed the high viscosity dense coating, can effectively stop the intrusion of oxygen, the protection stainless steel, thus reduce the high temperature oxidation scaling loss of stainless steel in process furnace.Do not compare with protecting sample, can reduce more than 90% through the stainless steel unit surface oxidization burning loss of this coating protection.And coating has reduced the spinel structure oxide compound that adheres to stainless steel surface to a great extent, has improved stainless surface quality.After the stainless steel steel billet of overprotection was come out of the stove, surface scale came off automatically, did not stay the coating vestige fully.
Embodiment
Embodiment 1
Ratio in silicon-dioxide 30%, aluminum oxide 60%, magnesium oxide 5%, calcium oxide 5% is prepared basic filler; Ratio preparation compound binding agent in water glass 20%, aluminum phosphate 70%, potassium silicate 10%.Basic coating with 46% and 54% compound binding agent mix and add the water of 0.5 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 500 microns, obtain high-temp antioxidizing paint A of the present invention.
Coating A is sprayed at 700 ℃ austenitic stainless steel 0Cr18Ni9 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1250 ℃ of degree insulations 3 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 91%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 2
Ratio in silicon-dioxide 94%, aluminum oxide 2%, magnesium oxide 2%, calcium oxide 2% is prepared basic filler; In water glass 90%, aluminum phosphate 10%, ratio preparation compound binding agent.Basic coating with 92% and 8% compound binding agent mix and add the water of 2 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 500 microns, obtain high-temp antioxidizing paint B of the present invention.
Coating B is sprayed at 900 ℃ austenitic stainless steel 0Cr17Ni12Mo2 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1300 ℃ of insulations 4 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 97%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 3
Ratio in silicon-dioxide 80%, aluminum oxide 10%, magnesium oxide 5%, calcium oxide 5% is prepared basic filler; In water glass 30%, aluminum phosphate 70%, ratio preparation compound binding agent.Basic coating with 50% and 50% compound binding agent mix and add the water of 1 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 20 microns, obtain high-temp antioxidizing paint C of the present invention.
Coating C is sprayed at 1000 ℃ ferritic stainless steel 1Cr17 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1200 ℃ of insulations 2 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 92%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 4
Ratio in silicon-dioxide 50%, aluminum oxide 35%, magnesium oxide 10%, calcium oxide 5% is prepared basic filler; Ratio preparation compound binding agent in water glass 40%, aluminum phosphate 40%, potassium silicate 20%.Basic coating with 80% and 20% compound binding agent mix and add the water of 20 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 50 microns, obtain high-temp antioxidizing paint D of the present invention.
Coating D is sprayed at 400 ℃ ferritic stainless steel 00Cr12 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1250 ℃ of insulations 3 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 98%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 5
Ratio in silicon-dioxide 60%, aluminum oxide 30%, magnesium oxide 9%, calcium oxide 1% is prepared basic filler; Ratio preparation compound binding agent in water glass 20%, aluminum phosphate 70%, lithium silicate 10%.Basic coating with 85% and 15% compound binding agent mix and add the water of 3 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 100 microns, obtain high-temp antioxidizing paint E of the present invention.
Coating E is sprayed at 500 ℃ Martensite Stainless Steel 2Cr13 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1240 ℃ of insulations 2 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 91%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 6
Ratio in silicon-dioxide 90%, aluminum oxide 1%, magnesium oxide 1%, calcium oxide 3% and boron oxide 5% is prepared basic filler; Ratio preparation compound binding agent in water glass 25%, aluminum phosphate 70%, lithium silicate 5%.Basic coating with 70% and 30% compound binding agent mix and add the water of 5 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 10 microns, obtain high-temp antioxidizing paint F of the present invention.
Coating F is sprayed at the Martensite Stainless Steel 7Cr17 surface of room temperature, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1220 ℃ of insulations 2 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 97%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 7
Ratio in silicon-dioxide 50%, aluminum oxide 45%, magnesium oxide 2%, calcium oxide 3% is prepared basic filler; Ratio preparation compound binding agent in water glass 50%, aluminum phosphate 48%, lithium silicate 2%.Basic coating with 50% and 50% compound binding agent mix and add the water of 15 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 40 microns, obtain high-temp antioxidizing paint G of the present invention.
Coating F is sprayed at 200 ℃ austenitic stainless steel 1Cr18Ni9 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1320 ℃ of insulations 2 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 92%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 8
Ratio in silicon-dioxide 94%, aluminum oxide 1%, magnesium oxide 2%, calcium oxide 3% is prepared basic filler; Ratio preparation compound binding agent in water glass 25%, aluminum phosphate 70%, lithium silicate 5%.Basic coating with 70% and 30% compound binding agent mix and add the water of 5 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 10 microns, obtain high-temp antioxidizing paint H of the present invention.
Coating F is sprayed at 490 ℃ austenitic stainless steel 00Cr19Ni10 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1220 ℃ of insulations 2 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 93%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 9
Ratio in silicon-dioxide 54%, aluminum oxide 40%, magnesium oxide 2%, calcium oxide 3% and boron trioxide 1% is prepared basic filler; Ratio preparation compound binding agent in water glass 35%, aluminum phosphate 60%, potassium silicate 2% and lithium silicate 3%.Basic coating with 55% and 45% compound binding agent mix and add the water of 5.6 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 71 microns, obtain high-temp antioxidizing paint I of the present invention.
Coating F is sprayed at 600 ℃ austenitic stainless steel 0Cr23Ni13 surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1290 ℃ of insulations 3.5 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 98%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Embodiment 10
Ratio in silicon-dioxide 40%, aluminum oxide 40%, magnesium oxide 10%, calcium oxide 5% and boron trioxide 5% is prepared basic filler; Ratio preparation compound binding agent in water glass 40%, aluminum phosphate 50%, lithium silicate 10%.Basic coating with 78% and 22% compound binding agent mix and add the water of 8 times of weight, in ball mill coating mixed grinding to granularity all are narrower than below 89 microns, obtain high-temp antioxidizing paint J of the present invention.
Coating F is sprayed at 400 ℃ duplex stainless steel 1Cr18Ni11Si4AlTi surface, forms linen original coating.To go into stove simultaneously through the steel plate of spraying and without the steel plate of spraying, 1320 ℃ of insulations 3 hours.Iron scale through the spraying surface of steel plate after coming out of the stove peels off automatically, and without the obvious attenuate of iron scale of spraying, the unit surface oxidization burning loss reduces by 94%, and the stainless steel base surfacing of protecting does not have corrosion, noresidue.
Claims (1)
1. high-temp antioxidizing paint that reduces stainless steel oxidization burning loss in process furnace, it is characterized in that described high-temp antioxidizing paint is made up of solid materials and water, wherein solid materials consists of: compound binding agent 8%-54%, basic filler 46%-92%, water are 0.5-20 times of solid materials weight; Described basic filler according to chemical composition is made up of silicon-dioxide 30%-90%, aluminium sesquioxide 1%-60%, magnesium oxide 1%-10%, calcium oxide 1%-5% and boron trioxide 0-5%; Described compound binding agent is made up of the water glass of 20%-90%, the potassium silicate of 0-20%, the lithium silicate of 0-15%, the aluminum phosphate of 2%-70%; Grain graininess in the described high-temp antioxidizing paint all is narrower than 500 microns; It is characterized in that with coating brushing, dip-coating or be sprayed at normal temperature to 1000 ℃ stainless steel steel billet (steel ingot) surface that formed coat-thickness is the 0.1-2 millimeter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100771287A CN101462859B (en) | 2009-01-16 | 2009-01-16 | High-temperature antioxidizing paint for lowering oxidation burning of steel in heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100771287A CN101462859B (en) | 2009-01-16 | 2009-01-16 | High-temperature antioxidizing paint for lowering oxidation burning of steel in heating furnace |
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| CN101462859A CN101462859A (en) | 2009-06-24 |
| CN101462859B true CN101462859B (en) | 2011-09-21 |
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| CN102815952A (en) * | 2012-08-02 | 2012-12-12 | 本钢第三轧钢厂 | Antioxidation coating for high temperature billet |
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