The disk is part of the opening mechanism of swing check valves trim in the Energy industry. It was originally manufactured in Carbon Steel but it corroded quickly because of the presence of hydrocarbons. Common corrosive environments may include the chemical industry, wastewater treatment and many others. Each environment presents specific corrosion challenges due to the presence of aggressive chemicals, salinity or humidity. Super Duplex was thought of as a replacement. However, this option would have been more expensive.