Experimental method for simulating stress corrosion of metal material under working conditions

A technology of stress corrosion and experimental methods, applied in the fields of weather resistance/light resistance/corrosion resistance, analysis materials, measuring devices, etc. Provide reliable basis for service life prediction, etc., to achieve the effect of good stress stability of the sample and high precision of strain value

Inactive Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, stress corrosion test methods at home and abroad usually use stress rings to conduct stress corrosion tests at normal temperature and pressure. In addition, for the few existing technologies that can simulate the environment of high temperature and high pressure experimental devices, the specimen fixtures are usually fixed. , the fixed specimen fixture cannot truly simulate the influence of solution scouring in the working environment
Such as CN102706750A discloses a kind of high temperature and high pressure constant load stress corrosion test method and device, which realizes the constant load stress corrosion test of metal materials under the combined action of high temperature and high pressure gas phase and liquid phase corrosion medium under a certain stress state, wherein the test fixture It is fixed inside the experimental device, which cannot truly simulate the impact of solution scouring in the working environment
[0003] Therefore, the evaluation results in the prior art are quite different from the field results, and cannot provide a reliable basis for the applicability and service life prediction of metal materials under actual working conditions. At present, the conventional stress corrosion test method has the following shortcomings:
[0004] (1) Using a stress ring or a tensile testing machine for loading cannot guarantee the accuracy of loading stress on small test pieces;
[0005] (2) There is a large difference between the experimental results without considering the influence of the solution flow under the high temperature and high pressure environment and the results in the actual working environment, which cannot provide a reliable basis for the applicability and service life prediction of metal materials under actual working conditions

Method used

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  • Experimental method for simulating stress corrosion of metal material under working conditions
  • Experimental method for simulating stress corrosion of metal material under working conditions
  • Experimental method for simulating stress corrosion of metal material under working conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] To test the stress corrosion resistance of a certain metal composite pipe, first process 4 pieces of metal specimen A, the specific dimensions are shown in Table 1. Calculate the force on the specimen according to the actual working conditions, use the strain gauge to load, and set parameters such as temperature, pressure, and flow rate according to the working conditions. The specific parameters are shown in Table 2.

[0056] In order to verify the force stability and reliability of the metal test piece under tensile stress, the stress of the test piece was measured and the test data was recorded in real time. The results are as follows: Figure 6 As shown, the force of the test piece fluctuates around the set value, within the error range, which verifies the stability of the force of the test piece and the rationality of the design of the loading fixture.

[0057] According to the present invention, each test piece is installed on the loading fixture, and the strain g...

Embodiment 2

[0063] The difference from Example 1 is that the flow velocity in the environmental parameters is 1.0m / s. Reprocess 4 pieces of A metal material test pieces, the dimensions are shown in Table 3, the environmental parameters are shown in Table 4, and the average value of the obtained corrosion rate is shown in Table 3. Figure 7 As shown, the tensile strength loss rate is as Figure 8 As shown, compared with Example 1, it can be known that the increase of the flow rate increases the corrosion rate of the metal material, and its tensile performance also loses more.

[0064] table 3

[0065]

[0066] Table 4

[0067] Stress (KN)

Embodiment 3

[0069] The difference from Example 1 is that: B metal material is selected for the experiment, and the size of the test piece is as follows: Figure 5 and Table 5, the resulting corrosion rate averages are Figure 7 As shown, the tensile strength loss rate is as Figure 8 As shown, compared with Example 1, it can be known that metal B is more corrosion-resistant in the same corrosive environment, and the loss of tensile properties is less.

[0070] table 5

[0071]

[0072] The corrosion test method of the present invention can measure the corrosion of metal materials under the action of specific temperature (30°C-300°C), pressure (0MPa-30MPa), flow velocity (0m / s-4.0m / s) and load (0KN-3KN) According to the experimental results, the applicability of metal materials in specific working conditions can be evaluated and their service life can be estimated.

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Abstract

The invention discloses an experimental method for simulating the stress corrosion of a metal material under working conditions, belongs to the technical field of metal corrosion simulation, and solves the problem in the prior art that a sample device cannot truly simulate solution scouring in the working environment. The experimental method comprises the following steps: firstly, designing related experimental parameters according to the actual working environment; then respectively connecting a test piece to an upper loading part and a lower loading part through pins, mounting respectively corresponding nuts, adhering a strain gage to the center of the test piece, connecting the stress gage to a strain meter through a wire, loading load onto the test piece through the upper loading part and the lower loading part; finally, after loading a certain stress, taking down the strain gage, suspending a loading mechanism on a circular tray through a high-temperature-resistant cotton thread, placing the loading mechanism in a vessel body, and starting to do an experiment and record related data according to the conventional method. The experimental method can be used for testing related properties of the metal test piece which is corroded at high temperature and high pressure, such as the corrosion rate and the tensile property.

Description

technical field [0001] The invention belongs to the simulation technical field of stress corrosion of metal materials, and in particular relates to a stress corrosion test method for simulating metal materials under actual working conditions. Background technique [0002] In the petrochemical industry, most pipelines and equipment are in a certain temperature, pressure, stress and corrosive medium environment, and are also affected by the erosion of liquid-phase corrosive media, and the actual working conditions of the metal materials used in pipelines and equipment The stress corrosion test can evaluate the applicability of metal materials in specific working conditions and predict their service life. At present, stress corrosion test methods at home and abroad usually use stress rings to conduct stress corrosion tests at normal temperature and pressure. In addition, for the few existing technologies that can simulate the environment of high temperature and high pressure ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/56G01N17/00
Inventor 胡松青吴刚马云飞谢唯一王少波郝义磊刘龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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