Method for testing carbon dioxide corrosion resistance of low-Cr pipeline steel

A carbon dioxide and inspection method technology, applied in the direction of weather resistance/light resistance/corrosion resistance, measuring devices, instruments, etc., can solve the problem of not establishing the inspection method for the corrosion performance of low Cr pipeline steel, and achieve convenient solution preparation and simple results. Effect

Inactive Publication Date: 2017-02-22
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steel mills at home and abroad have developed low-Cr pipeline steel for transporting CO 2 oil and gas, but did not establish low-Cr pipeline steels resistant to CO 2 Corrosion test method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Example 1: 3 low-Cr pipeline steel samples from Batch 1# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 40.01mm×9.98mm×4.01mm, 40.00mm×9.99mm×4.01 mm, 40.01mm×9.98mm×4.02mm (length×width×height), weighing 12.5514g, 12.4702g, 12.5783g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to make corrosion solution, and 5Kg corrosion solution was prepared, and the measured pH value was 2.61. Fix the three samples on the rotating sample holder, put them into a closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor to 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put 3 samples into 50%HCl+0.5%C at 60℃ 6 h 12 N 4 Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized wa...

example 2

[0026] Example 2: Three samples of low-Cr pipeline steel from Batch 2# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 39.86mm×9.98mm×4.12mm, 39.87mm×9.99mm×4.11 mm, 39.98mm×10.01mm×4.12mm, weighing 12.7827g, 12.8655g, 12.8153g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to prepare a corrosion solution. A total of 5Kg corrosion solution was prepared, and the measured pH value was 2.6. Fix the three samples on the rotating sample holder, put them into a closed reaction kettle, add the corrosion solution, and pass through the CO 2 gas. Control the temperature of the reactor at 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put the sample into 50%HCl+0.5%C at 60℃ 6 h 12 N 4 Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized wate...

example 3

[0027] Example 3: Three low-Cr pipeline steel samples of batch 3# were obtained by machining as parallel samples of low-Cr pipeline steel. The measured dimensions of the three samples were 40.01mm×10.02mm×4.01mm, 40.00mm×9.99mm×4.00 mm, 40.01mm×9.99mm×4.01mm, weighing 12.5013g, 12.1583g, 12.5836g respectively. Weigh 25gNaCl and 2.5gCH 3 COOH was dissolved in 4972.5g deionized water to prepare a corrosion solution. A total of 5Kg corrosion solution was prepared, and the measured pH value was 2.59. Fix the 3 samples on the rotating sample rack, put them into a closed reaction kettle, add the corrosion solution, and pass in CO 2 gas. Control the temperature of the reactor at 80°C, CO 2 The partial pressure is 1.5MPa, CO 2 The flow velocity is 2m / s. Start timing, end the test after 720 hours, and take out the sample. Put the sample into 50%HCl+0.5%C at 60℃ 6 h 12 N 4Soak in pickling solution for 1 hour, take out the sample, rinse it with deionized water and absolute ethan...

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Abstract

The invention discloses a method for testing carbon dioxide corrosion resistance of low-Cr pipeline steel. The method comprises the following steps: firstly, processing the low-Cr pipeline steel into a plurality of samples, finely grinding and machining the surfaces of the samples till the roughness reaches Ra 0.8; measuring the length, width, thickness and weight w1 of each sample; then, placing parallel samples in a closed reaction kettle provided with a rotary sample rack; adding a test solution into the reaction kettle, heating the reaction kettle to 80 DEG C, feeding CO2 gas into the reaction kettle for 168 hours; designing partial pressure of CO2 as 1.5 MPa and flow velocity as 2 m / s; taking out the samples corroded by CO2 gas, removing a CO2 corrosion product film, and weighing to obtain w2; and calculating the CO2 corrosion rate R of each sample, and averaging to obtain the carbon dioxide corrosion resistance of low-Cr pipeline steel. The method provided by the invention can simulate the CO2 corrosive environment in an oil and gas transmission pipeline, and quickly and accurately test the carbon dioxide corrosion resistance of the low-Cr pipeline steel.

Description

technical field [0001] The invention relates to a method for testing the carbon dioxide corrosion performance of steel, in particular to a method for testing the carbon dioxide corrosion resistance of low-Cr pipeline steel. Background technique [0002] When onshore oil and gas fields are exploited in the middle and later stages, the CO in the oil and gas fields 2 The content is very high, and the pipeline is prone to CO 2 Corrosion, causing the gas pipeline to burst. CO of pipeline steel 2 Corrosion has gradually become a difficult problem affecting the safety of natural gas transmission. Steel mills at home and abroad have developed low-Cr pipeline steel for transporting CO 2 oil and gas, but did not establish low-Cr pipeline steels resistant to CO 2 Test method for corrosion performance. Users usually require steel mills to provide anti-CO2 of low Cr pipeline steel 2 Corrosion performance parameters to ensure safe use. Contents of the invention [0003] The obje...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N5/00
CPCG01N17/00G01N5/00
Inventor 郎丰军黄先球程鹏彭浩庞涛马颖崔雷宋建红
Owner 武汉钢铁有限公司
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