Corrosive agent for detecting shot-blasted layer on austenitic stainless steel surface and using method of corrosive agent

A technology of austenitic stainless steel and corrosive agent, which is applied in the preparation of test samples, measurement devices, and optical devices, etc., can solve the problem of no shot peening layer morphology, etc., and achieves good reproducibility, convenient use, and operation. easy effect

Active Publication Date: 2016-03-02
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The electrolytic corrosion method and chemical corrosion method using conventional reagents can only show the microstructure of the austenitic stainless steel substrate, and there is no shot peening layer morphology on the inner surface that is different from the matrix microstructure (see figure 1 )

Method used

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  • Corrosive agent for detecting shot-blasted layer on austenitic stainless steel surface and using method of corrosive agent
  • Corrosive agent for detecting shot-blasted layer on austenitic stainless steel surface and using method of corrosive agent
  • Corrosive agent for detecting shot-blasted layer on austenitic stainless steel surface and using method of corrosive agent

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The components of the corrosive agent are proportioned according to the following volume fractions: hydrochloric acid - 27%; glycerol - 28%; nitric acid - 14%; picric acid ethanol solution - 31% (1-1.5g of picric acid is added to 100mL of absolute ethanol) The configuration method of the corrosive agent is: firstly mix 27% hydrochloric acid and 28% glycerol fully, then add 14% nitric acid and 31% picric acid ethanol solution in turn, the addition of the latter reagent should be fully dissolved and mixed with the former reagent Then inject.

[0035] (1) Sample preparation

[0036] Select the ground and polished S30432 inner surface shot-peened steel pipe sample. The selected sample inspection surface should be perpendicular to the longitudinal axis of the pipe (cross-section of the shot-peened pipe). 20mm curved sample is suitable;

[0037] (2) Sample etching

[0038] Immerse the ground and polished sample in the prepared etchant, make sure that the polished surface o...

Embodiment 2

[0044] The components of the corrosive agent are proportioned according to the following volume fractions: hydrochloric acid - 30%; glycerol - 26%; nitric acid - 16%; picric acid ethanol solution - 28% (1-1.5g of picric acid is added to 100mL of absolute ethanol) . The configuration method of the corrosive agent is: firstly mix 30% hydrochloric acid and 26% glycerol thoroughly, then add 16% nitric acid and 28% picric acid ethanol solution in sequence, the latter reagent should be added after the former reagent is fully dissolved and mixed Inject again.

[0045] (1) Sample preparation

[0046]Select the ground and polished TP347H inner surface shot-peened steel pipe sample. The test surface of the selected sample should be perpendicular to the longitudinal axis of the pipe (cross-section of the shot-peened pipe). 22mm curved sample is suitable;

[0047] (2) Sample etching

[0048] Immerse the ground and polished sample in the prepared etchant, make sure that the polished su...

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Abstract

The invention provides a corrosive agent for detecting a shot-blasted layer on an austenitic stainless steel surface and a using method of the corrosive agent. The corrosive agent is prepared from, by volume, 25-31% of hydrochloric acid, 26-28% of glycerol, 12-16% of nitric acid and 25-35% of a picric acid ethanol solution. By means of the advantages that a metallographic phase is rapidly, visually, easily and conveniently displayed, the chemical corrosive agent which is easy and convenient to use and applicable to daily inspection is developed, and the corrosive agent intensively corrodes the region of a shot-blasted hardened layer on the inner surface and does not intensively corrode a base body which does not deform. By means of the advantages of a chemical reaction, the appearance of the region of the shot-blasted hardened layer of inner stainless steel surface can be clearly and completely displayed under illumination of perpendicular light of a microscope, the stainless shot-blasted layer is deep measured conveniently and accurately, and the good practical value for control over the shot-blasted quality inside austenitic stainless steel for a super-(super)-critical boiler is achieved.

Description

technical field [0001] The invention relates to the technical field of corrosive agents, in particular to a corrosive agent for detecting shot peening layers on the inner surface of stainless steel pipes and a method for using the same. Background technique [0002] Austenitic stainless steel boiler tubes such as S30432 (18Cr-9Ni-3Cu-Nb-N), TP347H (18Cr-10Ni-Nb) have excellent high temperature performance, and are currently used in super (super) critical boiler high temperature superheaters and reheaters in my country. Devices and other components are widely used. After the inner surface of this kind of stainless steel is shot blasted, a high-density dislocation substructure hardening layer will be formed on the inner surface, which provides a good short-range diffusion path for Cr, and can quickly form a dense stable Cr oxide film, effectively improving Due to the high-temperature oxidation resistance of steel pipes, the inner surface shot blasting treatment technology of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/32G01B11/22G01B11/24
CPCG01B11/22G01B11/24G01N1/32G01N21/84
Inventor 曾辉李健张学星薛燕辉郭宏川赵彦杨文
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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