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Field sampling method of T/P92 steel ultra supercritical boiler tube

An ultra-supercritical boiler, on-site sampling technology, applied in sampling devices, preparation of test samples, etc., can solve the problems of material waste, pipeline damage, increase the time and cost of maintenance, and achieve the effect of simplifying sampling procedures

Active Publication Date: 2014-01-08
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sampling by cutting the pipe will cause great damage to the pipe, and at the same time cause a great waste of material
In addition, re-welding and heat treatment are required after pipe cutting, which greatly increases the time and cost of maintenance

Method used

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  • Field sampling method of T/P92 steel ultra supercritical boiler tube
  • Field sampling method of T/P92 steel ultra supercritical boiler tube
  • Field sampling method of T/P92 steel ultra supercritical boiler tube

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with embodiment.

[0025] The method for on-site sampling of T / P92 steel ultra-supercritical boiler pipelines of the present invention comprises the following steps:

[0026] (1) Use a special high-speed steel or hard alloy cutter to dig out a piece of metal sheet with a size of 5mm*3mm*1mm for inspection at the place where the T / P92 steel ultra-supercritical boiler pipeline needs to be inspected.

[0027] see figure 1 with figure 2 , The sampling tool is composed of a knife body and a knife handle. The knife body is composed of two independent parts: a carbide blade and a limit round roller. There is a circular hole at the upward bending place on both sides of the knife handle, which can rotatably support the shaft heads at both ends of the ellipsoid-shaped limiting round roller; the curvature radius of the knife edge is 30mm, and the curvature radius of the limiting ellipsoid-shaped roun...

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Abstract

The invention discloses a field sampling method of a T / P92 steel ultra supercritical boiler tube. The field sampling method comprises the steps of (1), digging up a metal sheet for detection at a place to be detected on the T / P92 steel ultra supercritical boiler tube by a special high-speed steel or hard alloy tool, wherein the metal sheet is 3mm-5mm long, 3mm-5mm wide and 0.8mm-1.2mm thick; (2), preparing the metal sheet obtained in the step (1) into a test sample of a scanning electron microscope or a transmission electron microscope according to the prior art; and (3), knocking a notch caused by sampling at the place in the step (1) by a hammer to ensure that the surface of the notch is flat so that residual stress is eliminated. By the field sampling method, parts to be detected on the inner surface and the outer surface of a steam pipeline of a heat-engine plant can be freely selected, and the sampling is not limited to two ends of the pipeline; no cutting, welding and heat treatment are needed during sampling, the sampling procedure is simplified, and the field sampling method is convenient and efficient.

Description

technical field [0001] The invention relates to an on-site sampling method for T / P92 steel ultra-supercritical boiler pipes. Background technique [0002] At present, ultra-supercritical units have become the main development trend of thermal power generation. In my country's ultra-supercritical thermal power units that have been put into operation and are under construction, the main steam pipeline is basically made of T / P92 ferritic (martensitic) heat-resistant steel. The steel has good processing performance, high high temperature strength and creep resistance. [0003] At present, the T / P92 steel used in China is mainly imported from abroad, and the application history is not long, so it is necessary to study its performance. For the microstructure of T / P92 steel, the reduction of material properties is difficult to observe obvious differences in optical microscope (OM), and it needs to be studied by scanning electron microscope (SEM) and transmission electron microsco...

Claims

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Application Information

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IPC IPC(8): G01N1/06G01N1/28
Inventor 聂铭吴岱丰黄丰陈志领欧阳柳章
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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