CN100417743C - Boronizing treatment and heat treatment process of martensitic stainless steel for steam turbine nozzle set - Google Patents
Boronizing treatment and heat treatment process of martensitic stainless steel for steam turbine nozzle set Download PDFInfo
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- CN100417743C CN100417743C CNB2005100302996A CN200510030299A CN100417743C CN 100417743 C CN100417743 C CN 100417743C CN B2005100302996 A CNB2005100302996 A CN B2005100302996A CN 200510030299 A CN200510030299 A CN 200510030299A CN 100417743 C CN100417743 C CN 100417743C
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Abstract
The present invention relates to a boronizing treatment and performance heat treatment process of martensitic stainless steel for steam turbine nozzle set. The boronizing treatment process of martensitic stainless steel for steam turbine nozzle set comprises the following steps: treated nozzle set work pieces of solid granular boronizing medium filled in vane steam passages are sent in a stove, and the stove is heated to 700 DEG C; the stove temperature is raised to 950 to 1050 DEG C by the speed of 100 DEG C an hour, and the temperature is held for 5 to 12 hours; then the slow cooling is carried out by the rate of 50 to 100 DEG C an hour until 300 to 400 DEG C, and the nozzle set work pieces are discharged; the nozzle set work pieces is cooled down in the air to the room temperature. The material tempering heat treatment is then carried out after the boronizing treatment process. The present invention adopts a method in which two processes are merged into single treatment, and the treating process is simplified. The hardness of a boronizing layer reaches HV1000 to 2000, the boronizing treatment and performance heat treatment effects are good, the treatment process is simplified, and the cost is low.
Description
Technical field
The present invention relates to martensitic stainless steel for steam turbine nozzle set boronising processing and property heat treatment technology.
Background technology
Development along with the large and super-critical generation technology, the vapor pressure and the temperature that enter the nozzle of steam turbine group increase substantially, oxide particle in the steam increases greatly, quickened the erosive wear of set of nozzles steam passage, the thermo-efficiency of steam turbine is descended, the lost of life of set of nozzles, the maintenance cost of unit increases.For effectively preventing the solids erosion on set of nozzles steam passage surface, high-power, high-parameters nozzle of steam turbine group blade surface should carry out boronising thermal treatment, to improve the erosion of solid particulate in the set of nozzles blade surface opposing steam-pipe.Nozzle steam passage surface boronizing intensive treatment technology is adopted in design as: 600MW supercritical pressure turbine, forms hard (FeBFe at matrix surface after making boronising
2B) compound to improve the performance of anti-solids erosion, prolongs the life-span of set of nozzles, guarantees that the thermo-efficiency after the unit long-time running does not descend because of the wearing and tearing of set of nozzles.
Boronising is to make the boron diffusion infiltrate the metallic surface, and forms the method for the iron boron compound layer of high rigidity in the metallic surface.It can make boride layer have high hardness, wear resistance, red hardness, good high temperature oxidation resistance and the performance of anti-solids erosion.The boronising of low alloy steel is a kind of proven technique, be widely used in the industrial production, but steam turbine high-temperature set of nozzles material therefor be the high alloy composition, at high temperature have the higher thermal epistasis can Martensite Stainless Steel, the alloying element that contains multiple obstruction boronising in the material, therefore under common boronising condition, the boron atom will be difficult to infiltrate realizes boronising in the material; In addition, also far above the boronising temperature of general steel alloy, property heat treatment and boronising processing can have a negative impact such Martensite Stainless Steel property heat treatment refining temperature mutually; These all make the boronising reinforcement that realizes overcritical or supercritical turbine set of nozzles steam passage material surface have more technological difficulties.
Summary of the invention
The object of the present invention is to provide a kind of martensitic stainless steel for steam turbine nozzle set property heat treatment technology, this treatment process adopts the method with boronising processing and two kinds of technologies merging of tempering heat treatment primary treatment, simplified treatment process, boride layer hardness reaches HV1000～2000, and boronising processing and property heat treatment are effective.
The present invention is achieved in that a kind of martensitic stainless steel for steam turbine nozzle set property heat treatment technology, is behind the boronising treatment process, carries out the material tempering heat treatment again; The boronising treatment process follows these steps to carry out:
(1) the processed set of nozzles workpiece of filling the solid granular boronizing agent in the blade steam passage is sent in the stove, be heated to 700 ℃;
(2) with 100 ℃ speed per hour furnace temperature is heated to 950～1050 ℃ again, is incubated 5～12 hours;
(3) slowly cool off with 50～100 ℃ of speed per hour then, come out of the stove during to 300～400 ℃;
(4) in air, be cooled to room temperature;
The tempering heat treatment step is:
(1) processed workpiece is within after being cooled to room temperature 8 hours are handled in boronising, enters stove internal heating to 670 ℃ ± 10 ℃ again;
(2) 670 ℃ ± 10 ° following soaking times greater than 4 hours, less than 8 hours;
(3) again air cooling to room temperature.
The present invention adopts the processing method to steam passage boronising of set of nozzles blade surface and the modified thermal treatment merging of set of nozzles bulk material matrix primary treatment, has both solved and has handled interactive problem respectively, has also simplified treatment process, has obtained the effect of getting twice the result with half the effort.High-temp solid boronising mode is taked in boronising to set of nozzles, makes through boronizing process and can form hard FeBFe at matrix surface
2The B compound, boride layer hardness reaches HV
100g: 1000～2000.Adopt a local boriding process, make that the processing of not oozing the position after the boronising processing adopts ordinary method to get final product set of nozzles blade surface steam passage.The present invention has overcome the technological difficulties that the martensite superalloy is difficult to boronising.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is a martensitic stainless steel for steam turbine nozzle set boronising treatment process synoptic diagram of the present invention;
Fig. 2 is martensitic stainless steel for steam turbine nozzle set performance (tempering) thermal treatment process synoptic diagram.
Embodiment
The present invention adopts the processing method to nozzle steam passage surface boronizing and the modified thermal treatment merging of nozzle body material matrix primary treatment.
Referring to Fig. 1, a kind of martensitic stainless steel for steam turbine nozzle set boronising treatment process follows these steps to carry out:
(1) the processed set of nozzles workpiece of filling the solid granular boronizing agent in the blade steam passage is sent in the stove, be heated to 700 ℃;
(2) with 100 ℃ speed per hour furnace temperature is heated to 950～1050 ℃ again, is incubated 5～12 hours.Because this temperature range is in the modified thermal treatment temp of nozzle body material matrix interval, and in this temperature range, boron can infiltrate in the nozzle body material matrix, so can satisfy the requirement to treatment temp of the steam passage boronising of set of nozzles blade and material body performance simultaneously;
(3) slowly cool off with 50～100 ℃ of speed per hour then, come out of the stove during to 300～400 ℃;
(4) in air, be cooled to room temperature.Adopt lower speed of cooling to make after oozing and oozed the unlikely generation distortion of nozzle workpiece, and guarantee the requirement of material matrix structure property.
Adopt the solid granular boronizing agent to be filled in the set of nozzles blade surface steam passage during boronising, have higher boron gesture, satisfy the boronising requirement to guarantee the steam passage blade surface.And does not ooze at other position or few boronising, is convenient to post-treatment.
Referring to Fig. 2, behind the boronising treatment process, carry out the material tempering heat treatment again, the steps include:
(1) processed workpiece is within after being cooled to room temperature 8 hours are handled in boronising, enters stove internal heating to 670 ℃ ± 10 ℃ again;
(2) 670 ℃ ± 10 ° following soaking times greater than 4 hours, less than 8 hours;
(3) again air cooling to room temperature.
Finished martensitic stainless steel for steam turbine nozzle set boronising treatment process and quenching-and-tempering process through after the above-mentioned steps.
Embodiment
Table 1 is the embodiment testing data of martensitic stainless steel for steam turbine nozzle set boronising treatment process and modified (tempering) thermal treatment process.
Table 1
Table 2 detects for the embodiment boride layer and body material detects data.
Table 2
After the detection data analysis to embodiment, can obtain: martensitic stainless steel for steam turbine nozzle set is behind the boronising treatment process, and its boronising degree of depth reaches 0.08～0.14mm, and boride layer hardness is HV
100g: 1500～1900, THE STRUCTURES OF BORONISING is FeBFe
2The B compound.The performance (hardness, intensity, plasticity, tissue etc.) of set of nozzles material matrix tissue all is in the former modifier treatment performance requriements scope simultaneously.Thereby make nozzle of steam turbine group blade steam passage reach the boronising requirement, the body material of set of nozzles has also reached the modifier treatment requirement, and its treatment process is simplified, and cost reduces.
Claims (1)
1. a martensitic stainless steel for steam turbine nozzle set property heat treatment technology is characterized in that: behind the boronising treatment process, carry out the material tempering heat treatment again; The boronising treatment process follows these steps to carry out:
(1) the processed set of nozzles workpiece of filling the solid granular boronizing agent in the blade steam passage is sent in the stove, be heated to 700 ℃;
(2) with 100 ℃ speed per hour furnace temperature is heated to 950～1050 ℃ again, is incubated 5～12 hours;
(3) slowly cool off with 50～100 ℃ of speed per hour then, come out of the stove during to 300～400 ℃;
(4) in air, be cooled to room temperature;
The tempering heat treatment step is:
(1) processed workpiece is within after being cooled to room temperature 8 hours are handled in boronising, enters stove internal heating to 670 ℃ ± 10 ℃ again;
(2) 670 ℃ ± 10 times soaking times greater than 4 hours, less than 8 hours;
(3) again air cooling to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100302996A CN100417743C (en) | 2005-10-08 | 2005-10-08 | Boronizing treatment and heat treatment process of martensitic stainless steel for steam turbine nozzle set |
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|---|---|---|---|
| CNB2005100302996A CN100417743C (en) | 2005-10-08 | 2005-10-08 | Boronizing treatment and heat treatment process of martensitic stainless steel for steam turbine nozzle set |
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| CN1772944A CN1772944A (en) | 2006-05-17 |
| CN100417743C true CN100417743C (en) | 2008-09-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629232B (en) * | 2008-07-16 | 2012-05-09 | 上海重型机器厂有限公司 | Heat treatment method for supercritical turbine cylinder steel castings |
| CN101936193B (en) * | 2009-06-30 | 2013-07-10 | 上海电气电站设备有限公司 | Method for manufacturing integral nozzle block of large-sized steam turbine |
| CN106939403B (en) * | 2017-02-14 | 2019-04-16 | 哈尔滨汽轮机厂有限责任公司 | The method of 1Cr9Mo1VNbN material nozzle of steam turbine boronising |
| CN112342492B (en) * | 2019-08-07 | 2022-08-09 | 北京国能龙威发电技术有限公司 | Method for boriding steam turbine nozzle made of 2Cr12NiW1Mo1V material |
| CN111850458A (en) * | 2020-08-04 | 2020-10-30 | 哈尔滨汽轮机厂有限责任公司 | Boronizing process for supercritical and above turbine annular nozzle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1554856A (en) * | 2003-12-26 | 2004-12-15 | 东方汽轮机厂 | Turbine jet nozzle static and moving blade preventing solid microparticle from etching and its heat treatment method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1554856A (en) * | 2003-12-26 | 2004-12-15 | 东方汽轮机厂 | Turbine jet nozzle static and moving blade preventing solid microparticle from etching and its heat treatment method |
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