Corrosion-resistant evaluation test method for large-diameter seamless line pipe
A seamless line pipe, evaluation test technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring device, instrument, etc., can solve the problem that the test method cannot accurately obtain the exact result, the comparative test and elaboration, and the test result is inaccurate and other problems, to achieve the effect of predicting environmental application performance, good reproducibility, and reducing development costs
Inactive Publication Date: 2012-10-03
TIANJIN PIPE GROUP CORP
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[0003] The stress-guided hydrogen-induced cracking test is sensitive to inclusions in seamless steel pipes. The presence of inclusions in seamless steel pipes will absorb hydrogen atoms due to stress concentration. Hydrogen bubbling occurs on the surface of seamless steel pipe products with poor corrosion stress and seriously affects their performance
Therefore, hydrogen bubbling should also be an important indicator for evaluating the corrosion resistance of seamless steel pipes, but the current test methods for corrosion resistance evaluation of seamless steel pipes have not carried out a detailed analysis of the relationship between the occurrence of hydrogen bubbling and the test conditions. Contrast the test with the description, so the standard test method cannot accurately obtain the exact result, and the test result is often affected by factors such as sample processing and test conditions, resulting in inaccurate test results
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[0025] The corrosion resistance evaluation test method of large diameter seamless line pipe of the present invention, the test method includes seamless line pipe sample test pretreatment method, corrosion evaluation test, sample treatment after test, comparison of different test conditions, test report ,Proceed as follows:
[0026] I. Pretreatment method of sample test
[0027] The size of the line pipe sample is 305×38×13mm, and it is divided into two kinds of samples according to the surface roughness. Marking; the other is direct marking without surface treatment; use wire cutting equipment to slot along the middle thickness direction of the sample, and use ultra-high-strength special molybdenum wire for wire cutting. The molybdenum wire has a diameter of 0.2mm and a groove depth of 2mm;
[0028] II. Corrosion evaluation test
[0029] Make the above two samples into a group, put the slots of the two samples outward, and support the 25.5mm places on the left and right side...
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The invention provides a corrosion-resistant evaluation test method for a large-diameter seamless line pipe to evaluate corrosion-resistant performances of the large-diameter seamless line pipe. A corrosion-resistant evaluation method suitable for large-diameter seamless line pipe is obtained by experimental comparison in terms of corrosive environments, presence or absence of loading force, surface roughness and the like. The corrosion-resistant evaluation test method for the large-diameter seamless line pipe has the advantages that the method can be used for detecting H2S (hydrogen sulfide) corrosion resistance of the large-diameter seamless line pipe in harsh utilization environments, whether the large-diameter seamless line pipe accords with requirements on actual corrosive environments or not can be more accurately judged by the number and the size of generated hydrogen blisters, and the method has more reference values for guiding utilization of the large-diameter seamless line pipe in projects. In addition, the corrosion-resistant evaluation test method for the large-diameter seamless line pipe is simple in test method and convenient to operate.
Description
technical field [0001] The invention belongs to the technical field of material corrosion, and in particular relates to a corrosion resistance evaluation test method for large-diameter seamless line pipes. Background technique [0002] Stress-guided hydrogen-induced cracking test is a common test method to study the corrosion resistance of steel. It can truly reflect the superposition of small cracks formed by hydrogen accumulation at inclusions or defects under the guidance of stress, and along the direction perpendicular to the stress. The cracking caused by the development of the direction (that is, the wall thickness direction of the steel plate). Since stress-directed hydrogen-induced cracking often occurs in the heat-affected zone of welds and other high stress concentration areas, it is usually used to evaluate the corrosion resistance of products such as plates and welded pipes. For seamless steel pipes, not only the phenomenon of hydrogen-induced cracking during ac...
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IPC IPC(8): G01N17/00
Inventor 孙宇王惠斌张冰张志远李效华张传友卢弘侯强窦志超
Owner TIANJIN PIPE GROUP CORP
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