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Thermal power plant T/P92 heat-resistant steel aging grade evaluation method based on combination of Brinell hardness, structure and precipitation phase characteristic

A technology of Brinell hardness and precipitated phase, which is applied in the field of heat-resistant steel aging rating of T/P92 supercritical units used in thermal power plants, can solve the problems of large rating error, single evaluation reference standard, unfavorable production and application, etc., and achieve the rating method Accurate, easy to grasp, and the effect of reducing testing costs

Inactive Publication Date: 2018-03-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, the method is only rated according to the average diameter of the precipitated phase particles obtained, and the evaluation reference standard is single, resulting in large rating errors, which is not conducive to actual production and application

Method used

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  • Thermal power plant T/P92 heat-resistant steel aging grade evaluation method based on combination of Brinell hardness, structure and precipitation phase characteristic
  • Thermal power plant T/P92 heat-resistant steel aging grade evaluation method based on combination of Brinell hardness, structure and precipitation phase characteristic
  • Thermal power plant T/P92 heat-resistant steel aging grade evaluation method based on combination of Brinell hardness, structure and precipitation phase characteristic

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Embodiment 1

[0043] The samples were taken from the main steam pipeline of a 600MW supercritical generator set in a power plant. The material is P92 steel with full martensitic structure, the steam pressure is 28.1MPa, the outlet steam temperature is 593°C, and the unit has been running for 35841 hours.

[0044] (1) Cut the sample

[0045] Cut the sample from the pipe to be inspected, the sample should include the entire wall thickness section of the inspection part, and consider the difference in horizontal and vertical orientation; for thicker parts, it is allowed to cut several samples, and it is necessary to ensure that the entire inspection is covered Cross-section; the cutting of the sample should be done mechanically, and the sample needs to be cooled during cutting to prevent tissue changes; the sample should not be cut by flame, if flame cutting must be used, the heat-affected zone must be completely removed after cutting.

[0046] (2) Sample flattening and polishing

[0047] The...

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Abstract

The invention relates to the field of inspection of iron and steel materials, particularly to a thermal power plant T / P92 ultra supercritical unit heat-resistant steel aging grade evaluation method based on the combination of the Brinell hardness, the structure and the precipitation phase characteristic. According to the present invention, by selecting the strict sample preparation method and using the etchant with the suitable ratio, the metallurgical structure morphologies with different aging grades can be evaluated under the low-magnification microscope, and especially the conversion fromthe martensite lath to the ferrite structure can be evaluated; and the evaluation standard considers the average grain size of the precipitation phase, and comprehensively considers the growth of theaverage grain size of the Laves phase and the hardness of the service steel at different aging degrees, wherein the hardness of the steel can intuitively and accurately characterize the aging condition.

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 / P92 super (ultra)critical unit heat-resistant steel used in thermal power plants based on the synthesis of Brinell hardness, structure and precipitated phase characteristics. Background technique [0002] Energy is the material basis of economic growth and social development. With the increasingly prominent energy shortage and the increasing environmental pollution, countries have been seeking to develop large-capacity and high-efficiency generators since the 1970s and 1980s. Improving steam parameters of generator set is the most effective solution to improve power generation efficiency. At present, countries all over the world are gradually raising the steam parameters of power generating units from subcritical (16.77MPa, 540°C) to supercritical (pressure higher than 22.19MPa) and ultra-supercritical (temperature higher than 593°C, ...

Claims

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Application Information

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IPC IPC(8): G01N33/20G01N21/84G01N3/40G01N1/28G01N1/32
Inventor 单以银杨旭严伟肖福仁杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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