CN109881196B - Main steam pipeline with inner wall anti-oxidation coating and preparation method thereof - Google Patents
Main steam pipeline with inner wall anti-oxidation coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a main steam pipeline containing an inner wall anti-oxidation coating and a preparation method thereof, the main steam pipeline consists of a main steam pipeline made of P91 and P92 materials for a power station and an inner wall anti-high temperature steam oxidation coating, the room temperature structure of a parent metal is tempered martensite, the anti-oxidation coating is an anti-oxidation coating with the thickness of 30-200 mu m and the average aluminum content of 5-20% by mass ratio. The preparation method sequentially comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating and diffusion sintering. The invention can realize the preparation of the main steam pipeline and the reheat steam pipeline of the thermal power generating unit by using the antioxidant coating on the inner wall of the ferrite and martensite main steam pipeline on the basis of matching the heat treatment process of the main steam pipeline and the reheat steam pipeline, thereby realizing the aim of resisting high-temperature steam oxidation. The method is simple and convenient to operate, and is suitable for large pipelines of ferrite/martensite steel main steam and reheat steam of P91, P92 and the like for thermal power generating units.
Description
Technical Field
The invention belongs to the field of thermal power generating unit component manufacturing, and particularly relates to a main steam pipeline containing an inner wall anti-oxidation coating and a preparation method thereof.
Background
The main steam and reheat steam pipeline is an important part for communicating the working medium flowing of a boiler and a steam turbine of a thermal power generating unit, and due to the fact that the main steam and reheat steam pipeline has a low thermal expansion coefficient, high thermal conductivity and excellent fatigue resistance, the ferrite-martensite heat-resistant steel becomes a preferred material for the main steam pipeline and the reheat steam pipeline of the ultra-supercritical coal-fired thermal power generating unit at the temperature of 600 ℃ and is widely applied.
The improvement of steam parameters of the thermal generator set requires high-strength and reliable-performance hot-strength steel. In the transformation of a newly-built unit and an old unit, a large amount of main steam and reheat steam pipelines made of P91 steel are used, the steel is medium Cr martensitic stainless steel, and the equal strength temperature of the steel is 625 ℃ compared with 1Cr18Ni9 steel. Above 550 c, the recommended design allowable stress for the steel is about 2 times that of 2.25Cr-1Mo steel. However, in the actual use of the power plant, the oxide layer was found to be thickened and peeled off on the steam side. Service data show that although the strength of the P91 and P92 steels is high, the oxidation resistance of the steels is poor. After oxidizing for 1000h in supercritical water at 550 ℃ and 25MPa, forming a double-layer oxide film with the thickness of about 20 mu m on the surface of the P92steel, wherein the outer layer is loose and porous Fe3O4The inner layer is relatively dense FeCr2O4And (3) a layer. The temperature is raised to 650 ℃, and the thickness of the oxide skin on the surface of the P92steel can reach 200 mu m after the P92steel is exposed to pure water vapor at normal pressure for 1000 hours. Ultra-supercritical coal at 600 deg.CIn the service process of the unit, accidents of pipe blockage and explosion leakage of a pipe joint between a header and a high-temperature superheater caused by oxidation of P91 steel and P92steel sometimes occur. However, according to the ASME code case 2179-7, the maximum use temperature of the P92steel is 649 ℃, and the method is expected to be popularized and applied to a 620 ℃ secondary reheating unit. The reliability of safe operation of the 600 ℃ ultra-supercritical thermal power generating unit is greatly reduced, and the application of the P91/P92 steel under higher steam parameters is limited, so that the development of the popularization and application work of the secondary reheating ultra-supercritical coal-fired power generation technology, in which the main steam temperature is 600 ℃, the primary reheating steam temperature is 600 ℃, the secondary reheating steam temperature is 620 ℃ and the steam pressure is 30-35MPa, is not facilitated in China at present. Therefore, it is one of the key points of the current work to seek a technical path capable of overcoming the oxidation problem in the service process of the ferrite-martensite heat-resistant steel of the 600 ℃ active ultra-supercritical thermal power generating unit and improve the steam oxidation resistance of the ferrite-martensite heat-resistant steel.
One very effective way to improve the oxidation resistance of metals is to apply a suitable coating to the metal surface. The coating is usually thinner, and can protect the metal component from high-temperature corrosion in the service environment on the premise of not influencing other properties of the matrix metal. The European coating for Supercritical Steel Cycles (SUPERCOAT) project mainly adopts the method of performing 700 ℃ traditional thermal diffusion aluminizing on the surface of heat-resistant steel. However, the method has the problems of high temperature, long heat preservation time of several hours, low preparation efficiency, high energy consumption, high cost and the like. French scientists have prepared Al-Si coatings on the surface of P92steel by chemical vapour deposition at 580 deg.C in a fluidised bed (see document: Sa u l I).
et Al, High performance of Al-Si-CVD-FBR coating on P92steel against Steel oxidation at 650 ℃: Part 1, Materials and plastics, 1, (2017)), however, this method has a low deposition rate, the reaction source and the residual gas after the reaction taking Part in the deposition are flammable, explosive or toxic, and is suitable only for components of small size and complex shape, but not for large components. The domestic researchers also take the needleThe steel surface coating technology for the boiler tube is explored. The institute of metal research of Chinese academy of sciences invented a slurry high-speed aluminizing method (publication No. CN103014612A) without protective atmosphere or protective layer under the atmospheric condition, after the aluminized slurry is deposited on the surface of workpiece, the workpiece is directly heated by means of induction heating or electric heating so as to prepare an aluminium diffusion layer with a certain thickness on the surface layer of workpiece. However, the method is complicated in process and is not suitable for components with complicated shapes and large sizes. The Western's institute of thermal engineering has developed an austenite main steam pipeline surface alloying process (publication No. CN 104372338A) for boiler pass/reheater, has greatly improved the anti-steam oxidation performance of austenite steel, this process needs to keep the heat-resisting main steam pipeline at 850-. Obviously, the direct application of this process to ferritic-martensitic heat-resistant steels would destroy the microstructure of their base metal and thus reduce the mechanical properties of the ferritic-martensitic steels.
Disclosure of Invention
It is an object of the present invention to overcome the above-mentioned disadvantages of the prior art and to provide a main steam line comprising an inner wall oxidation resistant coating and a method for its preparation. The preparation method can realize the preparation of the main steam pipeline and the reheat steam pipeline of the thermal power generating unit by using the antioxidant coatings on the inner walls of the ferrite and martensite main steam pipelines on the basis of matching the heat treatment processes of the main steam pipeline and the reheat steam pipeline, thereby realizing the aim of resisting high-temperature steam oxidation.
The invention is realized by adopting the following technical scheme:
a main steam pipeline comprising an inner wall anti-oxidation coating comprises a main steam pipeline made of P91 and P92 materials for a power station and an inner wall anti-high temperature steam oxidation coating, wherein the room temperature structure of a parent metal is tempered martensite, and the anti-high temperature steam oxidation coating is an anti-oxidation coating with the thickness of 10-50 mu m and the average aluminum content of 5-25% by mass ratio.
A preparation method of a main steam pipeline containing an inner wall anti-oxidation coating sequentially comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating and diffusion sintering; wherein the content of the first and second substances,
the slurry coated on the inner wall slurry layer is formed by mixing a penetrating agent and a binder, wherein the ratio of the penetrating agent to the binder is 100 g: 100 mL.
The invention is further improved in that the penetrating agent is composed of aluminum powder, silicon powder, nickel powder and alumina powder, wherein the mass of the aluminum powder, the silicon powder, the nickel powder and the alumina powder accounts for 30-60%, 10-30%, 20-40% and 10-20% of the total mass of the penetrating agent respectively, and the granularity of each powder is larger than 1000 meshes.
The invention is further improved in that the binder is composed of 10% -30% aluminum dihydrogen phosphate aqueous solution and 2% -20% NH4The Cl aqueous solution is mixed, and the volume ratio is 10: 1.
The further improvement of the invention is that the thickness of the slurry coated on the inner wall slurry layer is 100-300 μm, and the ball milling time of the penetrating agent and the binder before coating is not less than 10 hours.
The further improvement of the invention is that the main steam pipeline after the inner wall slurry layer is coated is placed for 12 to 24 hours at room temperature and then is dried and hardened for 10 to 20 hours at the temperature of 50 to 80 ℃.
The invention further improves that the specific operation of the diffusion sintering is as follows: and (3) preserving the heat of the main steam pipeline with the inner wall coated with the slurry after drying and hardening at the temperature of 750-790 ℃ for 5-20h, and adopting argon for protection.
The invention has the following beneficial technical effects:
the invention provides a main steam pipeline containing an inner wall anti-oxidation coating, which consists of main steam pipelines made of P91 and P92 materials for a power station and a high-temperature steam oxidation resistant coating on the inner wall, wherein the weight gain is less than 0.01mg/cm at 650 ℃/1000 h/saturated steam oxidation2The inner wall of the pipeline reaches the complete oxidation resistance level.
The preparation method of the main steam pipeline containing the inner wall anti-oxidation coating, provided by the invention, is matched with the heat treatment process of the main steam pipeline and the reheat steam pipeline, and realizes the preparation of the anti-oxidation coatings of the inner walls of the ferrite and martensite main steam pipelines of the main steam pipeline of the thermal power unit on the basis of not changing the high-temperature strength of P91 and P92 alloys, so that the inner wall of the main steam pipeline of the thermal power unit with the prepared coatings can achieve the anti-oxidation level, the operation is simple and convenient, and the preparation method is suitable for ferrite/martensite steel main steam and reheat steam large pipelines of P91, P92 and the like.
Drawings
FIG. 1 is a flow chart of a method of making a main steam line including an inner wall oxidation resistant coating in accordance with the present invention;
FIG. 2 is a structural configuration of a main steam pipe including an inner wall oxidation-resistant coating according to a first embodiment of the present invention;
fig. 3 is an oxidation kinetic curve of a sample of the inner wall of a main steam pipeline and a reheat steam pipeline of a thermal power generating unit in a saturated steam environment at 650 ℃ for 1000h after treatment according to a first embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
example one
Preparing a P92 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P92 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P92 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass of the aluminum powder, the silicon powder, the chromium powder and the alumina powder accounts for 30 percent of the total mass of the penetrating agent respectively,20%, 30% and 20%. The binder is prepared from 30% phosphate aqueous solution and 20% NH4The Cl solution is mixed according to the volume ratio of 10: 1. The proportion of the penetrating agent to the binder is 100 g: 100mL, and the thickness of the slurry coated on the surface of the main steam line was 200 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit subjected to the coating treatment of the slurry inner wall slurry at room temperature for 20 hours, and then drying and hardening at the temperature of 80 ℃ for 15 hours.
In the step of 'diffusion sintering', the dried and hardened boiler pass/reheater is subjected to heat treatment for 20 hours at the temperature of 750 ℃ by using an austenitic stainless main steam pipeline, and the inner wall of the boiler pass/reheater is protected by argon.
Example two
Preparing a P92 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P92 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P92 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass percentages of the aluminum powder, the silicon powder, the chromium powder and the alumina powder in the total mass of the penetrating agent are respectively 60%, 10%, 20% and 10%. The binder is prepared from 30% phosphate aqueous solution and 10% NH4The Cl solution is mixed according to the volume ratio of 10: 1. The proportion of the penetrating agent to the binder is 100 g: 100mL, and the thickness of the slurry coated on the surface of the main steam line was 200 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit at room temperature for 20 hours after the slurry on the inner wall of the thermal power generating unit is coated, and then drying and hardening at the temperature of 50 ℃ for 20 hours.
In the step of 'diffusion sintering', the dried and hardened boiler pass/reheater is subjected to heat treatment for 5 hours by using an austenitic stainless main steam pipeline at the temperature of 790 ℃, and the inner wall of the boiler pass/reheater is protected by argon.
EXAMPLE III
Preparing a P92 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P92 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P92 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass percentages of the aluminum powder, the silicon powder, the chromium powder and the alumina powder in the total mass of the penetrating agent are respectively 40%, 15%, 25% and 20%. The binder is prepared from 20% phosphate aqueous solution and 5% NH4The Cl solution is mixed according to the volume ratio of 10: 1. The proportion of the penetrating agent to the binder is 100 g: 100mL, the thickness of the slurry coating the surface of the main steam line was 300 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit at room temperature for 20 hours after the slurry on the inner wall of the thermal power generating unit is coated, and then drying and hardening at the temperature of 80 ℃ for 20 hours.
In the step of 'diffusion sintering', the dried and hardened boiler once/reheater is subjected to heat treatment for 10 hours by using an austenitic stainless main steam pipeline at the temperature of 780 ℃, and the inner wall of the boiler once/reheater is protected by argon.
Example four
Preparing a P92 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P92 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P92 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass percentages of the aluminum powder, the silicon powder, the chromium powder and the alumina powder in the total mass of the penetrating agent are respectively 50%, 10%, 20% and 20%. The binder is prepared from 10% phosphate aqueous solution and 20% NH4The Cl solution is mixed according to the volume ratio of 10:1, wherein the mass of NH4Cl in the binder is 10%. The proportion of the penetrating agent to the binder is 100 g: 100mL, and the thickness of the slurry coated on the surface of the main steam line was 200 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit subjected to the coating treatment of the slurry inner wall slurry at room temperature for 20 hours, and then drying and hardening at the temperature of 70 ℃ for 15 hours.
In the step of 'diffusion sintering', the dried and hardened boiler once/reheater is subjected to heat treatment for 18h by using an austenitic stainless main steam pipeline at the temperature of 760 ℃, and the inner wall of the boiler once/reheater is protected by argon.
EXAMPLE five
Preparing a P92 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P92 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P92 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass percentages of the aluminum powder, the silicon powder, the chromium powder and the alumina powder in the total mass of the penetrating agent are respectively 20%, 30%, 40% and 10%. The binder is prepared from 20% phosphate aqueous solution and 2% NH4The Cl solution is mixed according to the volume ratio of 10: 1. The proportion of the penetrating agent to the binder is 100 g: 100mL, and the thickness of the slurry coated on the surface of the main steam line was 200 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit at room temperature for 20 hours after the slurry on the inner wall of the thermal power generating unit is coated, and then drying and hardening at the temperature of 80 ℃ for 20 hours.
In the step of 'diffusion sintering', the dried and hardened boiler pass/reheater is subjected to heat treatment for 20 hours by using an austenitic stainless main steam pipeline at the temperature of 760 ℃, and the inner wall of the boiler pass/reheater is protected by argon.
EXAMPLE six
Preparing a P91 main steam pipeline containing an inner wall anti-oxidation coating according to the process shown in FIG. 1, wherein the specific process comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating, diffusion sintering and processing cleaning. Wherein, the steel making, casting, blank hot forming, annealing, hot extrusion tube making and normalizing heat treatment are all executed according to the ASME 2179SA335P91 standard.
In the procedure of 'cleaning oxide skin on the inner wall', the inner wall of the P91 main steam pipeline is subjected to sand blowing treatment, so that the surface quality of the inner wall meets the requirements of GB5310-2008 'seamless main steam pipeline for high-pressure boiler'.
In the working procedure of coating the inner wall slurry layer, slurry prepared by mixing a penetrating agent and a binder is ball-milled for 15 hours and then is uniformly sprayed on the inner wall of the pipeline. Wherein: the penetrating agent consists of aluminum powder, silicon powder and chromium powder, wherein the mass percentages of the aluminum powder, the silicon powder, the chromium powder and the alumina powder in the total mass of the penetrating agent are respectively 40%, 15%, 25% and 20%. The binder is prepared from 20% phosphate aqueous solution and 5% NH4The Cl solution is mixed according to the volume ratio of 10: 1. The proportion of the penetrating agent to the binder is 100 g: 100mL, the thickness of the slurry coating the surface of the main steam line was 300 microns. And (3) placing the main steam and the reheating steam pipeline of the thermal power generating unit subjected to the coating treatment of the slurry inner wall slurry at room temperature for 20 hours, and then drying and hardening at the temperature of 80 ℃ for 15 hours.
In the step of 'diffusion sintering', the dried and hardened boiler once/reheater is subjected to heat treatment for 10 hours by using an austenitic stainless main steam pipeline at the temperature of 780 ℃, and the inner wall of the boiler once/reheater is protected by argon.
TABLE 1 examples 1-6 and comparative samples coating Structure and Oxidation weight gain
FIG. 2 is a cross-sectional view of the coating in the first example, which shows that the coating has a thickness of 20 μm and mainly consists of an inner layer and an outer layer, the outer layer contains a small amount of pores and oxide inclusions, the average Al content in the coating is 18%, and the balance is Fe.
Fig. 3 is an oxidation kinetics curve of treated samples of inner walls of main steam and reheat steam pipelines of a thermal power generating unit in a saturated steam environment of 650 ℃ and 1000h in the first embodiment of the invention, and it can be found that the oxidation increase of a P92 main steam pipe is great, and oxidation weight loss occurs at a later stage, which indicates that an oxide film is peeled off, while a P92 main steam pipe with a coating prepared on an inner wall has an extremely low oxidation rate, and the oxidation weight increase of 1000h is less than 0.01mg/cm2Under the condition, the complete oxidation resistance level is achieved.
Claims (3)
1. A preparation method of a main steam pipeline containing an inner wall anti-oxidation coating is characterized in that the main steam pipeline consists of a main steam pipeline made of P91 and P92 materials for a power station and an anti-high temperature steam oxidation coating of the inner wall, the room temperature structure of a parent metal is tempered martensite, the anti-high temperature steam oxidation coating is an anti-oxidation coating with the thickness of 10-50 mu m and the average aluminum content of 5-25% by mass ratio;
the preparation method sequentially comprises the following steps: steel making, casting, blank hot forming, annealing, hot extrusion pipe making, normalizing heat treatment, inner wall oxide skin cleaning, inner wall slurry layer coating and diffusion sintering; wherein the content of the first and second substances,
the slurry coated on the inner wall slurry layer is formed by mixing a penetrating agent and a binder, wherein the ratio of the penetrating agent to the binder is 100 g: 100 mL; the infiltration agent consists of aluminum powder, silicon powder, nickel powder and alumina powder, wherein the mass of the aluminum powder, the silicon powder, the nickel powder and the alumina powder accounts for 30-60 percent, 10-30 percent, 20-40 percent and 10-20 percent of the total mass of the infiltration agent respectively, the granularity of each powder is more than 1000 meshes, and the binder consists of 10-30 percent of aluminum dihydrogen phosphate aqueous solution and 2-20 percent of NH4Cl aqueous solution is mixed, and the volume ratio is 10: 1;
the specific operation of diffusion sintering is as follows: and (3) preserving the heat of the main steam pipeline with the inner wall coated with the slurry after drying and hardening at the temperature of 750-790 ℃ for 5-20h, and adopting argon for protection.
2. The method as claimed in claim 1, wherein the thickness of the slurry applied on the inner wall slurry layer is 100-300 μm, and the ball milling time of the penetrating agent and the binder before application is not less than 10 hours.
3. The method according to claim 1, wherein the main steam pipe coated with the inner wall slurry layer is left at room temperature for 12-24 hours, and then dried and hardened at 50-80 ℃ for 10-20 hours.
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| CN111926284B (en) * | 2020-07-30 | 2022-09-09 | 西安热工研究院有限公司 | Steam turbine high-medium pressure inner cylinder steam oxidation resistant coating and preparation method thereof |
| CN113802088B (en) * | 2021-10-09 | 2023-01-31 | 西安热工研究院有限公司 | Preparation method of high-toughness high-temperature steam oxidation-resistant coating |
| CN116273798A (en) * | 2022-09-08 | 2023-06-23 | 西北工业大学 | Seamless steel pipe with inner wall deposited with corrosion-resistant coating, composition and preparation method |
| CN115584494A (en) * | 2022-10-27 | 2023-01-10 | 西安热工研究院有限公司 | Method and device for improving steam oxidation resistance of small-caliber boiler tube of coal-fired boiler |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1502657A1 (en) * | 1988-02-04 | 1989-08-23 | Белорусский Политехнический Институт | Pulverulent composition for aluminizing steel articles |
| CN1359446A (en) * | 1999-05-14 | 2002-07-17 | 西门子公司 | Component and method for producing a protective coating on a component |
| CN101660098A (en) * | 2009-09-16 | 2010-03-03 | 天津钢管集团股份有限公司 | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof |
| CN102851633A (en) * | 2011-06-27 | 2013-01-02 | 通用电气公司 | Method of maintaining surface-related properties of gas turbine combustor components |
| CN103484816A (en) * | 2012-06-13 | 2014-01-01 | 常州兰翔机械有限责任公司 | Calorizing impregnation agent for K4648 alloy and preparation method thereof, and calorizing method |
| CN104722752A (en) * | 2013-12-19 | 2015-06-24 | 通用电气公司 | Slurry and coating method |
| CN108118285A (en) * | 2017-12-29 | 2018-06-05 | 东方电气集团东方锅炉股份有限公司 | Improve low temperature aluminizing agent, method and the material of high temperature resistance steam oxidation performance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4655852A (en) * | 1984-11-19 | 1987-04-07 | Rallis Anthony T | Method of making aluminized strengthened steel |
| CN102864379B (en) * | 2012-10-08 | 2014-07-02 | 北京科技大学 | Fe-Cr-Co-W-Mo martensitic heat resistant steel and method for manufacturing same |
| JP5983886B2 (en) * | 2013-08-06 | 2016-09-06 | 新日鐵住金株式会社 | Seamless steel pipe for line pipe and manufacturing method thereof |
| CN106282912B (en) * | 2016-08-23 | 2018-05-08 | 南京工程学院 | A kind of pre- aluminising low carbon martensite steel plate press quenching forming method of high intensity |
-
2019
- 2019-04-11 CN CN201910290534.5A patent/CN109881196B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1502657A1 (en) * | 1988-02-04 | 1989-08-23 | Белорусский Политехнический Институт | Pulverulent composition for aluminizing steel articles |
| CN1359446A (en) * | 1999-05-14 | 2002-07-17 | 西门子公司 | Component and method for producing a protective coating on a component |
| CN101660098A (en) * | 2009-09-16 | 2010-03-03 | 天津钢管集团股份有限公司 | Hot-rolling seamless steel pipe applicable to high temperature of 580-620 DEG C and high pressure of 24-30MPa and production method thereof |
| CN102851633A (en) * | 2011-06-27 | 2013-01-02 | 通用电气公司 | Method of maintaining surface-related properties of gas turbine combustor components |
| CN103484816A (en) * | 2012-06-13 | 2014-01-01 | 常州兰翔机械有限责任公司 | Calorizing impregnation agent for K4648 alloy and preparation method thereof, and calorizing method |
| CN104722752A (en) * | 2013-12-19 | 2015-06-24 | 通用电气公司 | Slurry and coating method |
| CN108118285A (en) * | 2017-12-29 | 2018-06-05 | 东方电气集团东方锅炉股份有限公司 | Improve low temperature aluminizing agent, method and the material of high temperature resistance steam oxidation performance |
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