Since the 1950s, the gas industry has encountered pipeline accidents that could be related to the presence of hydrogen sulfide (H2S). Natural gases represent a mixture of individual gases (components), predominantly consisting of saturated hydrocarbons. At the same time, natural gas may contain up to 18–25 % of hydrogen sulfide, up to 25 % of carbon dioxide, and small volumes of nitrogen and hydrogen. The article studies conditions and impact factors, when hydrogen sulfide causes destruction of pipelines made of steels of various grades. The paper proves that steels with a duplex structure are more resistant to hydrogen cracking and hydrogen sulfide stress corrosion cracking.
Materials and methods
The study considers duplex steels with good weldability, relatively high yield and strength limits regarding satisfactory ductility and impact strength. This provides less specific metal consumption in the manufacture of structures calculated for strength due to a decrease in the sheet thickness.
duplex steels, transmission of corrosive media, hydrogen sulfide content, carbon dioxide content