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Method for testing pipeline steel for carbon dioxide corrosion under bending stress

A technology of bending stress and carbon dioxide, applied in the direction of weather resistance/light resistance/corrosion resistance, preparation of test samples, weighing by removing certain components, etc., to achieve the effect of simple test method, easy implementation and convenient use

Inactive Publication Date: 2018-12-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

but lacks CO 2 Corrosion performance test methods to support research and development tests and factory inspections, especially the test methods for simulating the service environment of pipeline steel

Method used

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  • Method for testing pipeline steel for carbon dioxide corrosion under bending stress

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Effect test

example 1

[0056] Machining obtained 1# batch of 3 parallel samples of pipeline steel, the yield strength of the sample is 450MPa, and the measured dimensions are 115.01mm×14.98mm×4.99mm, 115.02mm×14.98mm×5.01mm, 115.01mm×15.01mm×4.99 mm, weighing 67.3700g, 67.1704g, and 67.0601g respectively. Weigh 3 times the chemical reagent according to Table 1, dissolve it in 2L of deionized water, and prepare a 3L corrosion solution after fixed dissolution. The stress intensity of four-point bending loading is 0.8*450MPa, and the maximum deformation deflection y of the three samples is calculated to be 0.918mm, 0.915mm, and 0.918mm respectively. A four-point bending fixture is used to load the sample so that the maximum deformation deflection y of the sample reaches the calculated value. Put the loaded sample into the closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor to 70°C, CO 2 The partial pressure is 1.0MPa, and the flo...

example 2

[0060] The 2# batch of 3 parallel samples of pipeline steel was obtained by machining. The yield strength of the sample was 556MPa. mm, weighing 67.2345g, 67.1876g, and 67.1133g respectively. Weigh 3 times the chemical reagent according to Table 1, dissolve it in 2L of deionized water, and prepare a 3L corrosion solution after fixed dissolution. The stress intensity of four-point bending loading is 0.8*556MPa, and the calculated maximum deformation deflection y of the three samples is 1.144mm, 1.126mm, and 1.135mm respectively. A four-point bending fixture is used to load the sample so that the maximum deformation deflection y of the sample reaches the calculated value. Put the loaded sample into the closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor to 70°C, CO 2 The partial pressure is 1.0MPa, and the flow velocity is 1.5m / s. And start timing, end the test after 72 hours, and take out the sample. Pu...

example 3

[0062] The 1# batch of 3 parallel samples of pipeline steel was obtained by machining. The yield strength of the sample was 485MPa, and the measured dimensions were 114.91mm×14.99mm×4.98mm, 115.01mm×14.98mm×5.02mm, 114.96mm×15.00mm×5.05 mm, weighing 67.0122g, 67.1204g, and 67.1601g respectively. Weigh 3 times the chemical reagent according to Table 1, dissolve it in 2L of deionized water, and prepare a 3L corrosion solution after fixed dissolution. The stress intensity of four-point bending loading is 0.8*485MPa, and the maximum deformation deflection y of the three samples is calculated to be 0.992mm, 0.984mm, and 0.978mm respectively. A four-point bending fixture is used to load the sample so that the maximum deformation deflection y of the sample reaches the calculated value. Put the loaded sample into the closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor to 70°C, CO 2 The partial pressure is 1.0MPa...

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Abstract

The invention discloses a method for testing pipeline steel for carbon dioxide corrosion under bending stress. The method comprises the following steps: obtaining a bent pipeline steel sample; preparing a corrosion solution by adopting simulated oil well produced liquid; putting the bent pipeline sample into a closed reaction kettle, adding a corrosive solution, and introducing CO2 gas; controlling the temperature of closed reaction kettle to be 50-90 DEG C, the CO2 partial pressure to be 0.9-1.2MPa and flowing speed to be 1.3-1.7m / s; taking out the bent pipeline steel sample, soaking in a pickling solution, rinsing with deionized water and absolute ethyl alcohol, and drying by blowing; and weighing the blow-dried bent pipeline steel sample to obtain a corrosive rate R. According to the method, corrosion of pipeline steel under a service environment can be actually simulated, the CO2 corrosion resistance of pipeline steel can be quickly and accurately inspected, and the carbon dioxidecorrosion rate of the pipeline steel under the bending stress can be accurately obtained.

Description

technical field [0001] The invention relates to the field of testing the carbon dioxide corrosion performance of steel materials, in particular to a carbon dioxide corrosion test method for pipeline steel under bending stress. Background technique [0002] Tarim, Changqing and other oilfields in western my country CO 2 The content is very high, and the pipeline is prone to CO 2 Corrosion, causing the gas pipeline to burst. With the start of the West-East Gas Pipeline Project, the CO of pipeline steel 2 Corrosion problems have been severely exposed. Steel mills at home and abroad are actively developing anti-CO 2 Corroded pipeline steel. but lacks CO 2 Corrosion performance test methods are used to support research and development tests and factory inspections, especially the test methods for simulating the service environment of pipeline steel. As we all know, there is a large bending stress after the pipeline steel plate is cold processed into a pipe. CO of pipeline...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N17/00G01N5/04
CPCG01N1/286G01N5/04G01N17/006
Inventor 郎丰军黄先球庞涛李利巍程鹏彭浩马颖何嘉李江文黄菲宋建红
Owner 武汉钢铁有限公司
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