CN103439473B - A kind of 12Cr1MoV steel heating surface state evaluating method - Google Patents
A kind of 12Cr1MoV steel heating surface state evaluating method Download PDFInfo
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- CN103439473B CN103439473B CN201310295364.2A CN201310295364A CN103439473B CN 103439473 B CN103439473 B CN 103439473B CN 201310295364 A CN201310295364 A CN 201310295364A CN 103439473 B CN103439473 B CN 103439473B
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Abstract
The present invention relates to a kind of 12Cr1MoV steel heating surface state evaluating method, be specially feature based and conclude similarity theory and experimental study, shown that 12Cr1MoV heating surface establishes linked database with the normal temperature physicochemical characteristic parameter of high-temerature creep data correlation at operating temperatures.The normal temperature physicochemical characteristic parameter of known heating surface to be assessed, can inquire about high-temerature creep data corresponding with it from linked database, achieves and utilizes existing high-temerature creep data to complete the state estimation of heating surface.
Description
Technical field
The present invention relates to a kind of appraisal procedure, be specifically related to the 12Cr1MoV steel heating surface state evaluating method that a kind of feature based concludes similarity theory.
Background technology
Conventional heating surface state evaluating method be to heating surface carry out high temperature long time test, carried out the ageing state assessment of heating surface by analytical test result.But, in power station unit maintenance, need carrying out anticipation the serviceable life of heating surface, to carry out respective handling within next turn(a)round.If reevaluated after carrying out hot test, test period, at least more than 1 month, does not meet the ageing requirement of assessment.Meanwhile, power plant day-to-day supervision inspection for many years and heating surface ageing state evaluation work have accumulated a large amount of normal temperature physicochemical data and part high-temerature creep data.Known normal temperature data and high-temperature data have certain relevance.Set up the relevance of normal temperature data and high-temperature data, make full use of the state estimation that available data completes heating surface, improving state estimation efficiency and ageing, is urgent problem.
Content of the present invention
Problem to be solved by this invention is to provide a kind of feature based to conclude the 12Cr1MoV steel heating surface state evaluating method of similarity theory, for realizing associating and setting up corresponding linked database of normal temperature physicochemical data and high-temerature creep data, simplify evaluation process, avoid and repeat unnecessary hot test, significantly improve the ageing of assessment, save assessment correlation test expense.
In order to solve the problem, the technical solution used in the present invention is as follows:
A kind of 12Cr1MoV steel heating surface state evaluating method, it specifically comprises the following steps:
(1) with the determination of the normal temperature physicochemical characteristic parameter critical field of high-temerature creep data correlation
By detecting normal temperature physicochemical characteristic parameter and the high-temerature creep data of control sample, analyzing the relation of each normal temperature physicochemical characteristic parameter and high-temerature creep data, determining the normal temperature physicochemical characteristic parameter critical field of high-temerature creep data correlation;
(2) database of actual normal temperature physicochemical characteristic parameter data and high-temerature creep data correlation is set up
Normal temperature physicochemical characteristic parameter critical field step (1) obtained is associated with high-temerature creep data database;
(3) the normal temperature physicochemical inspection of to be assessed heating surface
Normal temperature physicochemical inspection is carried out to heating surface to be assessed, obtains actual normal temperature physicochemical characteristic parameter data; Whether the actual normal temperature physicochemical characteristic parameter data obtained measured by comparison step meet the normal temperature physicochemical characteristic parameter critical field in step (1);
(4) acquisition of the high-temerature creep data of heating surface to be assessed
The high-temerature creep data corresponding with the actual normal temperature physicochemical characteristic parameter scope measured by step (3) are searched in the linked database that step (2) obtains; Utilize high-temerature creep data, adopt the state estimation technology based on Creep Damage Mechanics to carry out heating surface tube assessment.
Further improve as the present invention, described normal temperature physicochemical characteristic parameter is chemical composition, metallographic examination, mechanical property.
Further improve as the present invention, the scope of described normal temperature physicochemical characteristic parameter is: metallographic structure pearlitic spheroidization grade 4 grades, tensile strength 480 ~ 495MPa, grain size 6-7 level, carbide particle average largest dimension be not more than 4.0 μm.
Further improve as the present invention, described carbide particle average-size is 2.5 ~ 3.0 μm.
Compared with prior art, beneficial effect of the present invention is:
Appraisal procedure provided by the present invention establishes the normal temperature physicochemical characteristic parameter of 12Cr1MoV steel and high-temerature creep data correlation, achieves associating and establishing corresponding linked database of normal temperature physicochemical data and high-temerature creep data.For heating surface to be assessed, only need to carry out normal temperature physicochemical inspection, from linked database, corresponding high-temerature creep data are directly inquired by its normal temperature physicochemical characteristic parameter, can completion status assess, avoid and repeat unnecessary hot test, significantly improve the ageing of assessment, save assessment correlation test expense.
Accompanying drawing explanation
Fig. 1 is 150MPa, 570 DEG C of high-temerature creep curves of 12Cr1MoV steel 1-8 group sample.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in more detail.
Embodiment 1
Along with the prolongation of working time, 12Cr1MoV steel heating surface is organized aging further, ambient temperature mechanical properties also progressively declines, its high temperature creep property also can change, for studying 12Cr1MoV steel pipe normal temperature performance and the high-temerature creep feature of pearlitic spheroidization 4 grades, select 8 groups of samples, often organize 3 samples and test under different stress level.Its basic condition is in table 1.
The basic condition of table 1 heating surface
According to GB/T14203-1993 " steel and alloy photoemission spectrum analytic approach general rule ", carried out chemical composition analysis to heating surface, the results are shown in Table 2, the chemical composition of visible institute analytical sample all meets material related quality criterion.
The chemical composition analysis result of table 2 heating surface sample
According to GB/T13298-1991 " the metallographic microstructure method of inspection " with reference to DL/T733-2001 " thermal power plant's 12CrlMoV steel ball rating scale ", metallographic grading is carried out to heating surface tube.
The metallographic examination result of table 3 heating surface sample
| Specimen coding | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Metallographic is graded | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Grain size | 7.0 | 7.0 | 7.0 | 6.0 | 6.5 | 7.0 | 6.5 | 6.5 |
| Carbide particle full-size (μm) | 2.5 | 2.7 | 2.8 | 2.9 | 3.0 | 2.7 | 3.0 | 4.3 |
According to GB/T228.1-2010 " metal material stretching test Part I: room temperature test method ", carried out mechanical properties test to heating surface, assay is in table 4, and visible result all meets material related quality criterion.
The mechanics property analysis result of table 4 heating surface sample
In sum, the chemical composition of 1-8 group sample all meets relevant criterion requirement, has no obvious difference, and pearlitic spheroidization rank is 4 grades, and mechanical property declines to some extent along with the increase of nodulizing grade, but does not exceed standard-required, and population differences is not remarkable.
570 DEG C of constant temperature uniaxial static creep tests are carried out under the proof stress of 150MPa, 130MPa, 110MPa to above 8 groups of samples.As shown in Figure 1, visible sample 1-8 group has similar variation tendency in the subordinate phase of high-temerature creep curve to the test findings of 150MPa, but the 8th group of sample fracture time obvious shortening compared with 1-7 group sample.1-7 group has similar high-temerature creep curvilinear characteristic as can be seen here, and the 8th group of sample has different high-temerature creep curvilinear characteristics from 1-7 group.The 12Cr1MoV normal temperature performance data analyzing 1-8 group is known, nodularization is organized to be characterized as the change of 4 grades, do not affect the change of its high-temerature creep curvilinear characteristic, tensile strength of mechanical property organizes the change of nodularization in acceptability limit with it, fail to affect the change of its high-temerature creep curvilinear characteristic, 8th group of sample carbonide full-size is 4.3um, relatively 1-7 group sample carbonide full-size is 3.0um, illustrate that carbonide has impact to high temperature creep rate, carbide size is larger, the alloying element of separating out in matrix is more, High-Temperature Strengthening effect dies down, have impact on its high temperature creep property.
According to test findings, carbonide full-size is less than 3.0um and is classified as similar features, organize nodularization to be 4 grades and be classified as similar features, what mechanical property was qualified is classified as similar features.
Set up the linked database of normal temperature physicochemical characteristic parameter critical field and high-temerature creep data, detect the normal temperature physicochemical characteristic parameter of standard to be assessed, as table 5
Normal temperature physicochemical characteristic parameter during table 5 12Cr1MoV steel to be assessed pearlitic spheroidization 4 grades
Through contrasting with the normal temperature physicochemical characteristic parameter critical field in linked database, it meets full-size and is less than 3.0um, nodularization is organized to be 4 grades, the feature that mechanical property is qualified, therefore this to be assessed can with the Data Matching in linked database, draw high-temerature creep data, and then employing carries out heating surface tube assessment based on the state estimation technology of Creep Damage Mechanics.
Linked character parameter provided by the invention and scope, establish normal temperature physicochemical and detect associating of data and high-temerature creep data, this just means before heating surface assessment, first can carry out characteristic coupling in linked database, once matched data success, the high temperature creep property test of metal material can be reduced.For each high-temperature behavior test, each test needs 20 high temperature samples, average each sample expense about 0.5 ten thousand yuan, reduce expenses about 100,000 yuan, economic benefit is obvious.
The above embodiment is only the preferred embodiments of the present invention, and and the feasible enforcement of non-invention exhaustive.For persons skilled in the art, to any apparent change done by it under the prerequisite not deviating from the principle of the invention and spirit, all should be contemplated as falling with within claims of the present invention.
Claims (3)
1. a 12Cr1MoV steel heating surface state evaluating method, is characterized in that it specifically comprises the following steps:
(1) with the determination of the normal temperature physicochemical characteristic parameter critical field of high-temerature creep data correlation
By detecting normal temperature physicochemical characteristic parameter and the high-temerature creep data of control sample, analyzing the relation of each normal temperature physicochemical characteristic parameter and high-temerature creep data, determining the normal temperature physicochemical characteristic parameter critical field be associated with high-temerature creep data;
(2) database of actual normal temperature physicochemical characteristic parameter data and high-temerature creep data correlation is set up
Normal temperature physicochemical characteristic parameter critical field step (1) obtained is associated with high-temerature creep data database;
(3) the normal temperature physicochemical inspection of to be assessed heating surface
Normal temperature physicochemical inspection is carried out to heating surface to be assessed, obtains actual normal temperature physicochemical characteristic parameter data; Whether the actual normal temperature physicochemical characteristic parameter data obtained measured by comparison step meet the normal temperature physicochemical characteristic parameter critical field in step (1);
(4) acquisition of the high-temerature creep data of heating surface to be assessed
The high-temerature creep data corresponding with the actual normal temperature physicochemical characteristic parameter scope measured by step (3) are searched in the linked database that step (2) obtains; Utilize high-temerature creep data, adopt the state estimation technology based on Creep Damage Mechanics to carry out heating surface tube assessment, described normal temperature physicochemical characteristic parameter is chemical composition, metallographic examination, mechanical property.
2. a kind of 12Cr1MoV steel heating surface state evaluating method according to claim 1, it is characterized in that, the scope of described normal temperature physicochemical characteristic parameter is: metallographic structure pearlitic spheroidization grade 4 grades, tensile strength 480 ~ 495MPa, grain size 6-7 level, carbide particle average largest dimension be not more than 4.0 μm.
3. a kind of 12Cr1MoV steel heating surface state evaluating method according to claim 2, it is characterized in that, described carbide particle average-size is 2.5 ~ 3.0 μm.
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| CN108520167B (en) * | 2018-03-30 | 2021-03-02 | 国电锅炉压力容器检验中心 | Method and system for rapidly evaluating high-temperature life of G102 steel heating surface |
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Inventor after: Wang Qing Inventor after: Niu Xiaoguang Inventor after: Fan Hui Inventor after: Zheng Xiangfeng Inventor after: Xu Xuexia Inventor after: Li Wenbin Inventor after: Chen Ersong Inventor before: Niu Xiaoguang Inventor before: Fan Hui Inventor before: Wang Qing Inventor before: Zheng Xiangfeng Inventor before: Xu Xuexia Inventor before: Li Wenbin Inventor before: Chen Ersong |
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Address after: 050091 Hebei high tech District of Shijiazhuang City Xinshi North Road, No. 368 Patentee after: National network Hebei Energy Technology Service Co., Ltd. Address before: 050091 Hebei high tech District of Shijiazhuang City Xinshi North Road, No. 368 Patentee before: Hebei Electric Power Construction & Adjustment Research Institute |