CN104017397B - A kind of high temp. protective coating for Nickel-Based Steel - Google Patents
A kind of high temp. protective coating for Nickel-Based Steel Download PDFInfo
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- CN104017397B CN104017397B CN201410229126.6A CN201410229126A CN104017397B CN 104017397 B CN104017397 B CN 104017397B CN 201410229126 A CN201410229126 A CN 201410229126A CN 104017397 B CN104017397 B CN 104017397B
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Abstract
The present invention relates to the high temperature protective coating of Technology for Heating Processing before a kind of Nickel-Based Steel hot rolling, coating powder part includes following components: Al2O320%-40%, SiO210%-30%, MgO10%-20%, TiO210%-20%, CuO5%-15%, Y2O35%-15%, Na2O0%-1%, K2O0%-1%, wherein Al2O3And SiO2Derive from kyanite and aluminum ash one or both；TiO2Derive from rutile ore.In coating, binding agent is by sodium silicate, KP1, and in Ludox, one or more mix；Dispersant is carboxymethyl cellulose.First powder and water 2:1 mixing and ball milling form slurry by weight during use, add binding agent, it is 5%-10% that binding agent accounts for the mass ratio of slurry, add dispersant, it is 1%-2% that dispersant accounts for the mass ratio of slurry, be milled to granularity 200-600 order after mixed and namely obtain coating, can below 800 DEG C direct spraying under steel billet, can effectively solve the difficult de-scaling problem that 1200-1350 DEG C of heat treatment of Nickel-Based Steel produces.
Description
Technical field
The present invention relates to one can steel billet spraying below 800 DEG C, for slowing down surface oxidation in Nickel-Based Steel heating process and reducing the inorganic aqueous high-temperature resistant coating of iron scale viscosity.
Background technology
At present, most domestic iron and steel enterprise have employed casting and rolling process and high-temperature hot send technique, and steel inevitably catalytic oxidation atmosphere in the hot rolling, produce oxide skin.The iron scale formed during with other iron and steel the difference is that the heating of, Nickel-Based Steel has very strong adhesiveness.Owing to nickel is relative to more difficult oxidation ferrum.In heating furnace, ferrum initial oxidation when occurring to aoxidize, produce the enrichment of nickel at iron scale internal layer, form metal twine and the granule of rich nickel, and develop along with the rising of temperature.Owing to this metal gauze is similar with metallic matrix with thermal coefficient of expansion etc. with the plasticity of granule, even if under the impact of water under high pressure, still not easily peeling off.If this iron scale is as clean in removed not in time, blank surface will be pressed into when rolling, cause surface defects of products, form deep mixed pit and pit at surface of steel plate, may result in product time serious and all scrap.
One of method solving Nickel-Based Steel de-scaling problem is to use high temp. protective coating at present, protects when heating steel billet.The method is easy to use and reduces cost, but the domestic high temperature protective coating patent for Nickel-Based Steel is less.
Proposing a kind of heating protection coating for desalling of alloy steel at Chinese patent 03118989X, can be used for the protection of the steel alloy heating steel billet of nickel content to 4%, heat 240 minutes at 1250 DEG C, iron scale reduces 70%, and mill product sheet material reconditioning quality reduces 80%.But there is problems of, this coating furnace temp more than 1300 DEG C or the steel billet time of staying long, its protection effect sharply declines.Additionally, this coating is not good to the nickel content steel alloy de-scaling protection effect more than 4%.
Propose a kind of high-temperature oxidation resistant coating for steel with high nickel content at Chinese patent 101705024, can be used for the high temperature protection of the nickel content Nickel-Based Steel more than 4% at 1250 DEG C-1350 DEG C.This coating with silicon oxide, aluminium oxide, magnesium oxide, zirconium oxide, containing ferrochrome powder for base material, and chromium content (mass fraction) >=35%.But this coating chromium constituent content is high, not only causes high cost, and chromium element is poisonous to human body, easily causes environmental pollution, should not use in a large number.
Summary of the invention
For the problem of Nickel-Based Steel later stage de-scaling difficulty, the present invention proposes the high temperature protective coating of Technology for Heating Processing before a kind of Nickel-Based Steel hot rolling.This coating material can below 800 DEG C direct spraying under steel billet; adhesion property is good; at high temperature form ceramic of compact base protective layer; effectively reduce oxygen element diffusion rate; the generation of minimizing ferrum oxide phosphorus, and can effectively reduce the adhesiveness of Nickel-Based Steel iron scale, simplify steel billet later stage treatment process; improve the lumber recovery of steel, and make cost be greatly lowered.This coating can effectively solve the difficult de-scaling problem that 1200-1350 DEG C of heat treatment of Nickel-Based Steel produces, and uses safety non-toxic, does not affect heating, and cost is low, non-environmental-pollution.
Purpose of the present invention is realized by below scheme:
A kind of high temp. protective coating for Nickel-Based Steel, coating is by powder, binding agent, dispersant and water mix homogeneously by a certain percentage.Coating powder part includes following components: Al2O320%-40%, SiO210%-30%, MgO10%-20%, TiO210%-20%, CuO5%-15%, Y2O35%-15%, Na2O0%-1%, K2O0%-1%, wherein Al2O3And SiO2Derive from kyanite and aluminum ash one or both；TiO2Derive from rutile ore.In coating, binding agent is by sodium silicate, KP1, and in Ludox, one or more mix；Dispersant is carboxymethyl cellulose.First powder and water 2:1 mixing and ball milling form slurry by weight during use, adding binding agent, it is 5%-10% that binding agent accounts for the mass ratio of slurry, adds dispersant, and it is 1%-2% that dispersant accounts for the mass ratio of slurry.
Coating used should be milled to granularity 200-600 order, if granularity is too thick, affect compactness and the dispersibility of coating, if granularity too detailed rules and regulations strengthen coating ingredients activity, easily react with unclassified stores, and particle size reduction is easily caused coating fusing point to be reduced, reducing coating normal guard temperature range, coating high temperature protection interval is 1200-1350 DEG C, and coating is steel billet spraying below 800 DEG C..
The Nickel-Based Steel high temp. protective coating that the present invention proposes, with Al2O3、SiO2For base material, at high temperature form ceramic base protective layer, add the refractory materials such as MgO, to reduce the ferrum oxide erosion to steel billet matrix under hot conditions, add TiO2The fusing point of adjustment coating, and the compactness of coating can be strengthened, add CuO, Y2O3Deng adjustment iron scale viscosity, in Ellingham-Rechardson figure, the position of copper is higher than nickel element, the low element in position in normal conditions can by Reduction of Oxide high for position, therefore at high temperature copper oxide can with nickel element generation displacement reaction, the metal gauze of the rich nickel of minimizing and particles generation, and Y2O3The adhesiveness to reducing iron scale that adds also have certain assosting effect, thus reaching the present invention to the high temperature protection of Nickel-Based Steel and the purpose promoting scale removal effect.
Present invention can apply to owing to iron scale internal layer causes, rich in metal gauze and the granule of rich nickel, the Nickel-Based Steel that later stage de-scaling is difficult, spray during use or brush to billet surface, to have casting iron sheet continuous casting steel billet, it is not necessary to carry out pretreatment, on coating effect without impact.
Accompanying drawing illustrates:
Fig. 1: have the 9Ni steel 1300 DEG C of coating protection to process constant temperature oxidation internal layer pattern (nickel content 9%) in a hour
Fig. 2: the 9Ni steel 1300 DEG C without coating protection processes constant temperature oxidation internal layer pattern (nickel content 9%) in a hour
Detailed description of the invention:
Below for embodiment will assist in and understand the present invention
Embodiment one
Selecting coating powder components by weight percent is Al2O330%, SiO220%, MgO20%, TiO210%, CuO8%, Y2O310%, Na2O1%, K2O1%.
First powder and water 2:1 are mixed into slurry during use.Adding binding agent, binding agent quality accounts for the 10% of stock quality.Adding dispersant carboxymethyl cellulose, dispersant quality accounts for the 1% of stock quality.
It is presented herein below for without the 9Ni steel under coating protection and the 9Ni adhering contrast test of steel oxidation iron sheet having coating protection.
9Ni steel cuts into the sample of 10mm × 10mm × 10mm specification, and in heating furnace, 700 DEG C are annealed processing and removing surface and oil contaminant, take out standby.Respectively surface is applied coating and not the sample of coating put into Muffle furnace and be heated to 1300 DEG C, be incubated one hour.
Fig. 1 has the 9Ni steel 1300 DEG C of coating protection to process one hour oxidation internal layer pattern of constant temperature.Fig. 2 is that the 9Ni steel 1300 DEG C without coating protection processes one hour oxidation internal layer pattern of constant temperature.By Fig. 1 it can be seen that coated sample oxidation internal layer does not generate metal gauze and the granule of rich nickel, and in Fig. 2, sample oxidation internal layer there are about metal gauze and the granular layer of the rich nickel of 100 μm.
Embodiment two
Selecting coating powder components by weight percent is Al2O335%, SiO215%, MgO15%, TiO218%, CuO8%, Y2O37%, Na2O1%, K2O1%.
First powder and water 2:1 are mixed into slurry during use.Adding binding agent, binding agent quality accounts for the 5% of stock quality.Adding dispersant carboxymethyl cellulose, dispersant quality accounts for the 1.5% of stock quality.
The present embodiment and embodiment one are distinctive in that experiment steel grade is Q690D (nickel mass fraction is about 0.8%) and coating ingredients difference to some extent, and experimental result is identical with embodiment one.
Embodiment three
Selecting coating powder components by weight percent is Al2O338%, SiO216%, MgO12%, TiO216%, CuO6%, Y2O310%, Na2O1%, K2O1%.
First powder and water 2:1 are mixed into slurry during use.Adding binding agent, binding agent quality accounts for the 8% of stock quality.Adding dispersant carboxymethyl cellulose, dispersant quality accounts for the 2% of stock quality.
The present embodiment and embodiment one are distinctive in that experiment steel grade is 20Cr2Ni4A (nickel mass fraction is about 3.45%) and coating ingredients difference to some extent, and experimental result is identical with embodiment one.
Claims (7)
1. the high temp. protective coating for Nickel-Based Steel; it is characterized in that; described coating is formed by powder, binding agent, dispersant and water mix homogeneously; first powder and water 2:1 mixing and ball milling form slurry by weight when wherein preparing; adding binding agent, it is 5%-10% that binding agent accounts for the mass ratio of slurry, adds dispersant; it is 1%-2% that dispersant accounts for the mass ratio of slurry, and coating powder is to be mixed by following mass fraction composition: Al2O320%-40%, SiO210%-20%, MgO10%-20%, TiO210%-30%, CuO5%-15%, Y2O35%-15%, Na2O0%-1%, K2O0%-1%.
2. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that described Al2O3And SiO2Derive from kyanite and aluminum ash one or both.
3. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that described TiO2Derive from rutile ore.
4. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that described binding agent is by sodium silicate, KP1, and in Ludox, one or more mix.
5. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that described dispersant is carboxymethyl cellulose.
6. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that coating protection interval is 1200-1350 DEG C.
7. a kind of high temp. protective coating for Nickel-Based Steel as claimed in claim 1, it is characterised in that coating is steel billet spraying below 800 DEG C.
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| CN201410229126.6A CN104017397B (en) | 2014-05-27 | 2014-05-27 | A kind of high temp. protective coating for Nickel-Based Steel |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105731847B (en) * | 2014-12-10 | 2018-04-03 | 辽宁法库陶瓷工程技术研究中心 | A kind of aqueous high-temperature-resistant inorganic binder and preparation method thereof |
| CN104817857B (en) * | 2015-05-07 | 2017-10-10 | 天津钢管集团股份有限公司 | Prevent high Cr, high Ni steel alloys from producing the coating of steel bonding defect in the hot rolling |
| CN106834971A (en) * | 2016-12-28 | 2017-06-13 | 芜湖市永帆精密模具科技有限公司 | A kind of corrosion-resistant cracking resistance abrasion-proof steel ball |
| CN106893962A (en) * | 2017-02-24 | 2017-06-27 | 南通大学 | The method that plasma spraying powder is prepared with aluminium ash |
| CN107083083A (en) * | 2017-04-11 | 2017-08-22 | 石家庄钢铁有限责任公司 | A kind of coating for preventing that low Ni descaling of steel stock is not net and application method and application |
| CN110846642A (en) * | 2018-08-20 | 2020-02-28 | 北京绿时顺风科技有限公司 | Method for manually preparing ceramic thermal barrier coating on metal surface at room temperature |
| CN110229949A (en) * | 2019-05-17 | 2019-09-13 | 南京亮而彩新材料有限公司 | It is a kind of based on the high-temperature oxidation resistant de-scaling interleaving agent and preparation method thereof containing nickel steel |
| CN110093053B (en) * | 2019-06-03 | 2020-12-25 | 唐山元力科技有限公司 | High-temperature decarburization-preventing protective coating in heating process of heavy rail steel billet and preparation method and application thereof |
| CN110451904B (en) * | 2019-07-25 | 2021-11-19 | 太原理工大学 | Silane modified high-temperature-resistant anti-oxidation coating material and preparation method thereof |
| CN110452565B (en) * | 2019-07-25 | 2021-03-26 | 太原理工大学 | High-temperature-resistant oxidation-resistant coating for hot rolling of nickel-based alloy and preparation method thereof |
| CN114100697B (en) * | 2020-08-31 | 2023-03-24 | 宁波方太厨具有限公司 | Preparation method of coating slurry |
| CN112442647A (en) * | 2020-11-30 | 2021-03-05 | 宁波大学 | Wear-resistant coating for bearing |
| CN112442646A (en) * | 2020-11-30 | 2021-03-05 | 宁波大学 | Hot spraying wear-resistant coating |
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