The high intensity martensite rustless steel null mass which is superior in resistance carbon dioxide corrosiveness and resistance sulfide stress corrosion

摘要

It is a martensitic stainless steel to limit the steel composition for a particular component, then the provisions in relation to the IM value of Mo content in the steel, and, it is fine during tempering and carbides precipitated tempered martensite, during tempering mainly the metal structure By forming an intermetallic compound precipitated and Laves phase of σ equality, 0.2% proof stress is stronger of 860MPa or more, can acid gas corrosion excellent and have resistance to sulfide stress corrosion cracking resistance possible. Thus, it can be applied in a wide range of fields as a steel highly practical and can be widely used in applications of OCTG other in an environment containing carbon dioxide, hydrogen sulfide, and two or more of these or chloride ion.