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Experimental apparatus for simulating stress corrosion of metal material under actual working conditions

A technology of actual working conditions and stress corrosion, which is used in measuring devices, weather resistance/light resistance/corrosion resistance, and analysis materials. The effect of good stress stability and high strain value accuracy of the sample is achieved.

Inactive Publication Date: 2015-11-04
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
For example, CN102706750 A discloses a 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 The fixture 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 apparatus for simulating stress corrosion of metal material under actual working conditions
  • Experimental apparatus for simulating stress corrosion of metal material under actual working conditions
  • Experimental apparatus for simulating stress corrosion of metal material under actual working conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 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 stress on the specimen according to the actual working conditions, use the strain gauge to load, and set the temperature, pressure, flow rate and other parameters according to the working conditions. The specific parameters are shown in Table 2.

[0052] 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, and within the error range, the stability of the force of the test piece and the rationality of the design of the loading fixture are verified.

[0053] According to the present invention, each test piece is installed on the loading fixture, and the str...

Embodiment 2

[0059] 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.

[0060] table 3

[0061]

[0062] Table 4

[0063] Stress (KN)

Embodiment 3

[0065] 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.

[0066] table 5

[0067]

[0068] The corrosion test device 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 apparatus for simulating stress corrosion of a metal material under actual working conditions, belonging to the technical field of simulation of metal corrosion. The apparatus overcomes the problem that a conventional sample apparatus cannot authentically simulate solution scouring in a working condition environment. The experimental apparatus comprises a testing mechanism, loading mechanisms and a rotary mechanism, wherein a circular pallet is arranged on a mixer shaft of the rotary mechanism and is provided with four small holes which are uniformly distributed along the circumferential direction of the circular pallet, a metal test piece of each loading mechanism is located in the cavity of the loading clamp, a foil gauge is attached onto the central part of the metal test piece and is connected with a strain gauge through a lead, loading is realized by applying pressure onto upper and lower loading ends of the loading mechanisms, and all the loading mechanisms are hung onto the small holes through cotton threads. The experimental apparatus provided by the invention can test related performances of the metal test piece after corrosion under high temperature and high pressure conditions, e.g., corrosion rate and tensile properties.

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 experimental device and 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 a...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N17/00
Inventor 王秀民游靖马云飞韩新德王洪兵冮明超陈生辉张田田
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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