CRA
CRA is abbreviation of 'Corrosion Resistant Alloy'. CRA material should be considered whenever there is potential presence of water, particularly when combined with CO2, H2S or chlorides. CRA are metal alloys engineered to resist degradation of metal surface in corrosive environment. Stainless steel is commonly used CRA and provides resistance to corrosion. Stainless steel with varying percentages of Chromium, Nickel, and Molybdenum are used in oil & gas wells depending on corrosivity assessments in the application.