GB/T 21832.3-2024 in English

Advantages of duplex stainless steel in oil and gas transportation

Duplex stainless steel combines the corrosion resistance of austenitic stainless steel with the high strength of ferritic stainless steel, and is particularly suitable for oil and gas environments with high hydrogen sulfide and carbon dioxide content. Its main advantages include:

• Excellent resistance to pitting corrosion and stress corrosion
• Good processing and welding properties
• High cost performance and long service life

Standard formulation background and technology evolution analysis

As the development of global oil and gas resources extends to complex environments, the failure of traditional carbon steel and austenitic stainless steel in corrosive media has become increasingly prominent. Duplex stainless steel has become the preferred material for oil and gas pipelines due to its unique organizational properties. The formulation of the GB/T 21832 series of standards has filled the gap in this field in China and promoted the industrial application of duplex stainless steel.

Implementation recommendations

To ensure the effective implementation of GB/T 21832.3—2024 standard, it is recommended that:

1. Material selection stage: Select appropriate duplex stainless steel grades (such as S22253, S22053, etc.) according to the corrosiveness of the conveying medium to ensure that the chemical composition meets the requirements.
2. Manufacturing process: Strictly control welding process parameters, use automatic welding and heat treatment equipment to ensure weld performance.
3. Detection link: Conduct comprehensive non-destructive testing (UT, RT) and mechanical property testing to ensure that the product meets the standard requirements.
4. Maintenance stage: Regularly check the operation status of the pipeline, especially in a highly corrosive environment, and deal with defects in a timely manner.