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Ageing rating method for T/P91 steel based on diameter of precipitated phase particle

A technology of particle diameter and precipitated phase, which is applied in the field of aging rating of T/P91 steel based on the particle size of precipitated phase, can solve the problems of quality evaluation and process researcher confusion

Inactive Publication Date: 2013-04-24
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

On the other hand, in the practice of evaluating the aging of T / P91 steel, since there is no definite standard, it will cause confusion for quality judges and process researchers.

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  • Ageing rating method for T/P91 steel based on diameter of precipitated phase particle
  • Ageing rating method for T/P91 steel based on diameter of precipitated phase particle
  • Ageing rating method for T/P91 steel based on diameter of precipitated phase particle

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[0024] Take the T91 steel pipe for the subcritical boiler reheater actually operated in a power plant in Anhui. The operating temperature is 570°C, the pressure is 17.0MPa, the size is Ф65mm×5mm, and the operating time is 43,000 hours.

[0025] The aging of the T / P91 steel based on the particle diameter of the precipitated phase is now rated. The rating method includes the following steps:

[0026] (1) Prepare a sample of T / P91 steel to be evaluated, cut a section of T / P91 steel with a length of 10mm, a width of 5mm, and a height of 5mm as a sample to be evaluated, and use 200#~400#~600#~800#~1200 Grind the surface of the sample to be evaluated with #~1600#~3000# metallographic sandpaper, and grind each time until the direction of the scratches on the surface of the sample to be evaluated is consistent;

[0027] (2) Perform mechanical polishing on the ground sample to be evaluated until there are no scratches on the surface of the sample to be evaluated;

[0028] (3) Put the ...

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Abstract

The invention discloses an ageing rating method for T / P91 steel based on the diameter of a precipitated phase particle. The method comprises the following steps: (1) cutting a segment of T / P91 steel as a to-be-evaluated sample and successively grinding the surface of the to-be-evaluated sample with abrasive paper for metallograph until scratches on the surface of the to-be-evaluated sample are of a same direction; (2) carrying out mechanical polishing on the to-be-evaluated sample until the surface of the to-be-evaluated sample is free of scratches; (3) putting the polished to-be-evaluated sample in an FeCl3 solution and carrying out corrosion with the FeCl3 solution; (4) acquiring a structure picture of the corroded to-be-evaluated sample, observing the structure picture on a scanning electron microscope and carrying out shooting to obtain the structure picture; and (5) carrying out ageing rating on T / P91 steel based on the structure picture obtained in step (4). The method provided by the invention can quantify ageing states of T / P91 steel, thereby providing reference standards and bases for scientific research personnel and technologist to evaluate ageing of T / P91 steel.

Description

technical field [0001] The invention relates to the field of iron and steel material inspection, in particular to an aging rating method for T / P91 steel based on the diameter of precipitated phase particles. Background technique [0002] T / P91 steel is widely used in thermal power plant supercritical and super (super) critical unit boiler pipe steel due to its good high temperature performance and relatively cheap price. During long-term high temperature service, T / P91 steel will occur Aging is the decline in performance, accompanied by a series of changes in the precipitated phase during the process. On the other hand, in the practice of evaluating the aging of T / P91 steel, the lack of a definite standard will cause confusion for quality judges and process researchers. For this reason, a method that can quantify the aging rating of T / P91 steel becomes a need. Contents of the invention [0003] The purpose of the present invention is to provide an aging rating method for...

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Application Information

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IPC IPC(8): G01N15/02
Inventor 窦洪王志武戴沅宋涛
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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