Вибір конструкційних матеріалів деталей фонтанної та запірної арматури нафтогазовидобувного обладнання у сірководневостійкому виконанні

Abstract

The resistance to sulfide stress corrosion cracking (SSCC) of structural materials and components for Christmas tree, which are made of steel of various grades and classes has been investigated. The steels with high SSCC resistance for manufacturing body parts, gates, pins, flanges, etc. have been selected. To prepare the gate it is proposed to use plasma welding deposition of nickel-chromium alloy that provides high corrosion resistance combined with high resistance to SSCC and fatigue crack growth resistance. 30XMA steel manufactured at “Dniprospetsstal” plant is recommended to produce details for ball cock K2 class after the appropriate heat treatment. It has been shown that the conventional steels used for making Christmas tree are unsuitable for operation in hydrogen sulphide environments.