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

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...

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

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