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Aging rating method for 15Cr1Mo1V steel for steam pipeline of thermal power unit based on field detection for hardness and metallographic structure

A technology of 15cr1mo1v and metallographic structure, which is applied in the field of metal material inspection of thermal power units, can solve the problems of low universality and lack of systematic research and analysis of conditions, and achieve the effect of simple and effective method, shortening maintenance period and cost saving

Active Publication Date: 2019-02-05
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for 15Cr1Mo1V steel, due to its low usage and lack of systematic research and analysis of its service condition, there has been a lack of an effective aging rating method to provide guarantee for the safe and reliable operation of the unit

Method used

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  • Aging rating method for 15Cr1Mo1V steel for steam pipeline of thermal power unit based on field detection for hardness and metallographic structure
  • Aging rating method for 15Cr1Mo1V steel for steam pipeline of thermal power unit based on field detection for hardness and metallographic structure
  • Aging rating method for 15Cr1Mo1V steel for steam pipeline of thermal power unit based on field detection for hardness and metallographic structure

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Experimental program
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Effect test

Embodiment 1

[0040] A method for aging rating of 15Cr1Mo1V steel for steam pipes of thermal power units based on on-site detection of hardness and metallographic structure, comprising the following steps:

[0041] 1. Hardness testing:

[0042] The inspection parts of the pipeline should be selected at places with higher temperature and greater stress, such as the back arc surface of the elbow at the outlet of the final superheater, the back arc surface of the elbow at the outlet of the final reheater, the pipe section at the inlet of the high-pressure steam pipe, and The pipe section where the pipe diameter and wall thickness change in the steam pipeline, etc.; first use a grinding wheel to remove the oxide skin on the surface of the inspection part, and polish it to reveal a metallic luster; use 120# louvers to polish the plane, and the polished plane area is about 10cm 2 , The depth is 0.5mm ~ 1mm; After grinding, the polished surface is cooled to room temperature, and the Brinell hardne...

Embodiment 2

[0057] Unit 1 of a thermal power plant is a 142MW unit produced in Russia. The steam turbine model is ПГ-140 / 165-130 / 15-2, and the boiler model is Е-420-13.7-560КГ. The initial design pressure of the superheated steam at the outlet of the boiler is 13.73MPa, and the temperature is 560°C ± 5°C. The actual operating temperature of the main steam pipeline is 560°C, the material is 15Cr1Mo1V, and the specification is Ф377mm×50mm. When the first elbow at the boiler outlet was selected for inspection, the unit had been running for a total of 120,000 hours.

[0058] 1. Hardness testing:

[0059] First, use a grinding wheel to remove the oxide skin on the outer surface of the elbow back arc, and polish it to reveal a metallic luster, and then use a 120# louver to polish an area of ​​about 10cm 2 , The small plane with a depth of 0.5mm ~ 1mm, after grinding, the polished surface is cooled to room temperature, and the hardness test is carried out with a portable Leeb hardness tester, ...

Embodiment 3-5

[0071] According to the method of Embodiment 1 of the present invention, the other three different parts of the main steam pipeline of the power plant are aged and rated, and samples are taken for room temperature tensile strength detection. The data is shown in the table below:

[0072]

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Abstract

The invention discloses an aging rating method for 15Cr1Mo1V steel for a steam pipeline of a thermal power unit based on field detection for a hardness and a metallographic structure. The method detects the hardness and the metallographic structure of a material, and evaluates an aging level of the material correspondingly according to a detection result for the hardness and the metallographic structure. The method is simple, accurate and effective, a state of the material can be evaluated without damaging cut or sampling, and a metal inspector can be guided to accurately judge an aging degreeof 15Cr1Mo1V steel after high temperature service, thereby assisting a power plant to evaluate the service reliability of the material, and avoiding heavy accidents such as steam pipeline cracking due to severe aging of the material during operation of the power plant. The equipment of the power plant and the personal safety are effectively guaranteed, the maintenance period of the power plant isshortened, and the cost is saved.

Description

technical field [0001] The invention relates to the field of metal material inspection of thermal power units, in particular to an aging rating method for 15Cr1Mo1V steel used in steam pipes of thermal power units based on on-site detection of hardness and metallographic structure. Background technique [0002] The steel used for high-temperature and high-pressure steam pipes of thermal power units is prone to aging of the organizational structure under long-term service, which in turn leads to the deterioration of the mechanical properties of the steel. The safe and reliable operation and the personal safety of power plant personnel have caused great hidden dangers. [0003] 15Cr1Mo1V steel is a pearlitic heat-resistant steel imported from the former Soviet Union. The corresponding grade of the former Soviet Union is 15X1M1Ф. This steel has good hardenability, heat strength and oxidation resistance, so it is used for steam pipes and High temperature components such as head...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/42G01N21/84G01N1/28G01N1/32
CPCG01N1/28G01N1/286G01N1/32G01N3/42G01N21/84G01N2203/0003G01N2203/0019G01N2203/008G01N2203/0274
Inventor 杨希锐宋利句光宇刘文生邓辉张琬如乔梁郑艳刘永成王警卫朱国斌贾少威江野王东王昊裴喜伟曹胜仁牛腾赟
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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