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Quantitative analysis method for residual life of T91 steel pipes

A quantitative analysis, T91 technology, used in particle size analysis, particle and sedimentation analysis, measuring devices, etc., can solve problems such as large errors and long time consumption

Inactive Publication Date: 2012-06-20
嘉兴市特种设备检验检测院
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] According to the current research on the performance of T91 steel pipe high-temperature aging experiments, in order to solve the above-mentioned various shortcomings of the existing quantitative analysis method for the remaining life of T91 steel pipe in power plant boilers, the purpose of the present invention is to provide a quantitative analysis method for the remaining life of T91 steel pipe. The internal carbide particle size is used to quantitatively analyze the residual life of T91 steel pipes for power plant boilers, which solves the long time-consuming process of the traditional Larson-miller method and its derivative methods and non-destructive testing methods in the quantitative analysis of the residual life of T91 steel tubes for power plant boilers , the problem of large error

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  • Quantitative analysis method for residual life of T91 steel pipes
  • Quantitative analysis method for residual life of T91 steel pipes
  • Quantitative analysis method for residual life of T91 steel pipes

Examples

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Embodiment 1

[0064] In a thermal power plant in Shaoxing, a superheater tube is selected as the tested part. The material of the superheater tube is T91 steel, and the working temperature is 600 °C. From the side elbow of the superheater tube close to the boiler, 20 samples were cut with a Bosch GWS7-125 angle grinder, and water was sprayed during the cutting process to reduce the cutting temperature. Then use the XQ-1 metallographic sample mounting machine to inlay the cut samples, and then replace them with No. 180, No. 320 and No. 400 in the MP-1 single-disk two-speed metallographic sample grinding and polishing machine. , No. 500, and No. 600 water sandpaper for rough grinding in turn. Then change to No. 01, No. 02, and No. 03 metallographic sandpaper for fine grinding to ensure that the surface roughness Ra≤0.8μm. The grinding surface should be cleaned before each replacement of different types of sandpaper. During the whole mechanical grinding process, water should be sprayed at th...

Embodiment 2

[0068]In a thermal power plant in Ningbo, a reheater tube is selected as the tested part. The material of the reheater tube is T91 steel, and the working temperature is 620°C. From the elbow of the reheater tube near the flue gas side, 20 samples were cut with a Bosch GWS 720 angle grinder, and water was sprayed during the cutting process to reduce the cutting temperature. Then use the XQ-2B metallographic sample mounting machine to inlay the cut samples, and then replace them with No. 180, No. 320, No. 400, and No. 500 on the MoPao160 single-disk two-speed metallographic sample grinding and polishing machine No., No. 600 water sandpaper for rough grinding in turn. Then change to No. 01, No. 02, and No. 03 metallographic sandpaper for fine grinding to ensure that the surface roughness Ra≤0.8μm. The grinding surface should be cleaned before each replacement of different types of sandpaper. Moreover, water should be sprayed at the same time during the whole mechanical grinding...

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Abstract

The invention relates to the field of quantitative analysis for residual life of steel pipes in a power station, in particular to a quantitative analysis method for residual life of T91 steel pipes. The method solves the problems of long elapsed time and large errors existing in the process that the traditional Larson-miller method and the derived method thereof and a nondestructive testing method conduct quantitative analysis for the residual life of T91 steel pipes in a power station boiler. The method comprises the following steps of: cutting a tested workpiece to form a sample, conducting metallographic inlaying, conducting grinding and polishing, and spraying water in the process of grinding and polishing; and after the surface roughness Ra is controlled by at most 0.8Mu m, fully etching the grinding and polishing surface with a nitric-acid alcoholic solution, then sequentially passing a metallographic microscope, and testing the particle sizes of carbides with a metallographic structure according to the national standard. Data handling is conducted on the particle sizes of the carbides obtained from tests of several times, and then the quantitative residual life of the T91 steel pipes is directly output. The method does not need do a creep tension experiment, and the analysis result has higher reliability. The method only needs the metallographic microscope to complete assessment of quantitative life, the test efficiency is high, the time period is short, and the cost is low.

Description

technical field [0001] The invention relates to the field of quantitative analysis of remaining life of power station steel pipes, in particular to a method for quantitative analysis of remaining life of T91 steel pipes. Background technique [0002] With the development of high-parameter and large-capacity boilers in power plants, the research and development of steel for boiler tubes in the world is carried out in the direction of high performance and low cost. T91, represented by 9-12% Cr ferritic system with excellent comprehensive performance, is heat-resistant Steel is currently widely used in high steam parameter generating units. T91 was successfully developed by the Oak Ridge National Laboratory in the 1980s. This steel is based on T9 (9Cr-1Mo) steel, limiting the upper and lower limits of C content, adding a small amount of N and a small amount of strong carbon and nitrogen compounds. For V and Nb, the precipitation of dispersed MX-type V / Nb carbonitrides is used ...

Claims

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Application Information

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IPC IPC(8): G01N15/02
Inventor 潘金平程宏辉潘柏定祝新伟
Owner 嘉兴市特种设备检验检测院
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