Method for measuring thickness of austenitic stainless steel inner-wall oxide skin

A technique for measuring the thickness of austenitic stainless steel, applied in the direction of electric/magnetic thickness measurement, electromagnetic measuring device, etc., which can solve the problem of signal drowning

Active Publication Date: 2012-07-04
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the very thin oxide skin attached to the inner wall of the austenitic stainless steel pipe, the magnitude range is one ten thousandth of the accumulation amount, or even a few ten thousandths of the accumulation amount, and the signal is overwhelmed by electromagnetic interference
At present, there is no information about the thickness measurement of the oxide skin on the inner wall of austenitic stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] Concrete application process of the present invention is as follows:

[0033] The first step is to measure the magnetic equivalent of the oxide scale thickness on the inner wall of the tube to be tested;

[0034] 1) Connect the detection instrument and the Hall sensor with a cable;

[0035] 2) Determine the position of the pipe to be tested and mark it;

[0036] 3) Grinding the outer surface of the pipe to remove the scale on the outer wall;

[0037] 4) When the Hall sensor is 2-20cm away from the measured point, the instrument is zeroed;

[0038] 5) The Hall sensor is in contact with the measured point, and the meter displays the magnetic equivalent of the oxide skin thickness on the inner wall of the pipe;

[0039] The second step is to take the standard sample tube for anatomical analysis to determine the calibration coefficient R;

[0040] 1) Connect the detection instrument and the Hall sensor with a cable;

[0041] 2) Grinding the outer surface of the standar...

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PUM

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Abstract

The invention relates to a method for measuring thickness of austenitic stainless steel inner-wall oxide skin. The method is characterized by comprising the following three steps: 1) measuring a magnetic equivalent of the thickness of the inner-wall oxide skin of a to-be-measured tube; 2) taking a sample tube, dissecting, analyzing and confirming a calibrated coefficient R; and 3) calculating the thickness of the inner-wall oxide skin of the to-be-measured tube according to the calibrated coefficient R and the magnetic equivalent of the thickness of the inner-wall oxide skin of the to-be-measured tube. According to the method, the thickness of the austenitic stainless steel inner-wall oxide skin can be quickly, conveniently and accurately measured; the growth rate of the oxide skin can be efficiently monitored; the early warning is supplied according to the thickness of the oxide skin generated by the inner wall of the tube; and the tube-explosion accident caused by the large-scale dropping and plugging of the oxide skin is avoided.

Description

technical field [0001] The invention belongs to the technical field of non-destructive detection and diagnosis, and in particular relates to a method for measuring the thickness of oxide skin on the inner wall of austenitic stainless steel. Background technique [0002] The thermal power plant unit operates in a long-term high-temperature environment, and the inner wall of the boiler heating surface superheater and reheater tube is oxidized and corroded due to the action of water vapor, forming scale. The formation of scale reduces the thermal conductivity of the superheater and reheater tubes, affects the heat transfer efficiency of the tubes, and reduces the effective wall thickness of the tubes. When the temperature of the steam outlet of the tube remains unchanged, the existence of scale will cause the tube to be overheated for a long time, resulting in a series of adverse consequences such as increased oxidation, increased metal creep rate, tissue aging and performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06
Inventor 刘玉民刘雪峰何晓东贾建民盛国柱
Owner XIAN THERMAL POWER RES INST CO LTD
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