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Corrosion evaluation method for corrosion-resistant alloy surfacing welding layer of underwater oil and gas facility

A technology of corrosion-resistant alloy and surfacing layer, which is applied in the field of corrosion evaluation of corrosion-resistant alloy surfacing layer of underwater oil and gas facilities, can solve the problems of lack of clear and comprehensive evaluation methods for the corrosion resistance of surfacing layer, and reduce corrosion The effect of risk of failure

Active Publication Date: 2020-09-29
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]At present, there is no clear and comprehensive evaluation method for the corrosion resistance of the surfacing layer

Method used

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  • Corrosion evaluation method for corrosion-resistant alloy surfacing welding layer of underwater oil and gas facility
  • Corrosion evaluation method for corrosion-resistant alloy surfacing welding layer of underwater oil and gas facility
  • Corrosion evaluation method for corrosion-resistant alloy surfacing welding layer of underwater oil and gas facility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] The corrosion risk of the 625 surfacing layer is explored. The material of the surfacing layer is nickel-based alloy 625, and the base metal is X65.

[0120] Cut the sample along the fusion line, leaving only the upper overlay part.

[0121] The sample was tested for mechanical properties, metallographic structure and hardness. The metallographic sample was made and the metallographic observation was carried out using an optical microscope for the weld part in the middle, and no harmful phase was found. Take 3 points respectively in the weld zone, heat-affected zone and base metal to test the hardness, and the hardness test results meet the requirements of the ISO-15156 standard. The corresponding mechanical performance parameters were obtained by making a tensile sample test, and the results met the requirements of the ISO-15156 standard.

[0122] The long-term corrosion simulation experiment is used for testing, and the experimental environment is specified accordin...

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PUM

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Abstract

The invention provides a corrosion evaluation method for a corrosion-resistant alloy surfacing welding layer of an underwater oil and gas facility. The method is used for quantitatively evaluating thecorrosion resistance of a surfacing welding layer by comprehensively characterizing the structure state, the mechanical property, the comprehensive corrosion rate and the local corrosion risk of thesurfacing welding layer. According to the invention, quantitative indexes are provided mainly for the corrosion resistance of the corrosion-resistant alloy surfacing welding layer of the underwater oil and gas facility, corrosion resistance evaluation can be conducted on surfacing welding materials applied under corresponding working conditions, and material selection, welding process evaluation and corrosion control are guided.

Description

technical field [0001] The invention belongs to the field of corrosion performance evaluation, and specifically relates to a method for evaluating corrosion of corrosion-resistant alloy surfacing layers of underwater oil and gas facilities through comprehensive characterization of the structural state, mechanical properties, overall corrosion rate, and local corrosion risk of the surfacing layer. Background technique [0002] With the rapid growth of my country's economy, the domestic demand for energy has increased significantly, and the focus of domestic energy exploitation is gradually shifting to deep-water environments. In the process of offshore oil and gas development, it is usually difficult to separate and dehydrate oil and gas media in a timely manner, resulting in extremely harsh internal corrosion environments for various production facilities. , The corrosion problem of underwater facilities is extremely serious. [0003] Stainless steel and nickel-based alloys...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/04G01N3/08G01N17/00
CPCG01N3/02G01N3/04G01N3/08G01N17/006
Inventor 安维峥王竹胡丽华冯喆常炜朱莉娅李大朋马强张雷
Owner CHINA NAT OFFSHORE OIL CORP
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